Siam Physics Congress 2015
Wednesday, 20 May 2015 - Friday, 22 May 2015
Book of Abstracts ii Siam Physics Congress 2015.
iii iv Contents
A galaxy rotation curve from a modified Newtonian model based on Mach’s principle . . 1
CMB cold spot anomaly from cosmic void ...... 1
Variations in the Neutron Time Delay Distribution at the Princess Sirindhorn Neutron Mon- itor ...... 1
Follow-up Photometry of New Eclipsing PCEBs from the Sloan Digital Sky Survey: SDSS J214140.43+050730.0 ...... 2
Photometric Observation and Analysis of Hot Uranus Exoplanet GJ3470b by Transit Method ...... 3
Magnetic Field Line Random Walk in Isotropic Turbulence at Very High Kubo Number . 3
Analysis of Peculiar Dips Changed of SDSS J102102.25+174439.9 Light Curve ...... 4
On the role of short period Cataclysmic Variables from Catalina Sky Survey ...... 4
Star Formation and Age-Metallicity Relation in a Galaxy Group NGC 4065 ...... 5
Photometric Monitoring of Active Galactic Nuclei using the Thai Robotic Telescope in Chile ...... 5
Angular Extension of Io Magnetic Footprint in Corresponding to Volcanic Activity on Io 6
Black hole in Massive Gravity and its thermodynamics ...... 6
The oscillation spectra of the oEA stars ...... 7
Simulations of Polar-Region Atmospheric Ionization Induced by the Large Solar Storm on January 20, 2005 ...... 7
Can Dark Matter be a Bose-Einstein Condensate? ...... 8
Some Recent Developments in Statistical Mechanical Description of Galaxy Clustering . 8
Particle’s Trajectory Around Static and Spherically Symmetric black hole in Massive Grav- ity Theory ...... 9
Overcoming the Seeing Limitations at 2.4-m Thai National Telescope with Lucky Imaging Technique ...... 9
Observations and Monte Carlo Simulation of the Princess Sirindhorn Neutron Monitor at a Vertical Cutoff Rigidity of 16.8 GV ...... 9
v Lumpy Cosmic Strings ...... 10
Influence of Magnetospheric Plasma on Aurora at Magnetic Footprints ofIo ...... 10
Rashba Effect from Schwinger’s Oscillator Model ...... 11
Single Rubidium-85 Atom in a Far Off-resonance Dipole Trap ...... 11
Quantum Algorithm for Finding Roots of nth Degree Polynomials ...... 11
Four Level Dynamic in Rubidium-85 Magneto-Opical Trap ...... 12
Concentric-Ring Atom Interferometer ...... 12
Split-Operator Method for Fabry-Perot Interferometry ...... 13
The study of Cavity Quantum Electrodynamics as a heralded quantum memory . . . . . 13
Adiabatic Interaction between Rydberg Atom and Ground-State Atom ...... 13
Phase structure and microstructure of CaZrO3 powder prepared by molten salt method . 14
The Synthesization of biocomposite materials of Hydroxyapatite/beta-tricalcium phosphate/biopolymer scaffold for bone tissue regeneration ...... 14
Hydroxyapatite and Ceramic Composite Coatings by Novel Plasma Spraying Technology for Bio-Medical Implant Application ...... 15
Determination of Unconjugated Estriol by Using Surface Plasmon Resonance (SPR) Biosen- sor ...... 15
Free human Chorionic Gonadotropin beta (hCGβ) detection of The Triple Test for Down’s syndrome screening in maternal serum using Surface Plasmon Resonance Technique (SPR) ...... 16
Revealing an unusual transparent phase of superhard iron tetraboride under high pressure ...... 17
Cathodoluminescence study of electric-field induced migration of defects in single crystal ZnO ...... 17
Stability Diagrams of Single-Electron Transistors ...... 18
Computational study of carbon dioxide adsorption on single-walled carbon nanotubes. . 18
Ab initio calculations of structural phase transitions of XP compounds (X=La, Ce, Pr, and Nd) under high pressure ...... 19
Hydrogen adsorption of Ti decorations in Mg-Metal Organic Framework-74: A First-Principles Study ...... 19
Theoretical Study of Charge Transport in Alternating Donor-Acceptor Complex Oligomers for Polymer Solar Cell Applications: Poly(3-hexylthiophene) Based Azole ...... 20
Theoretical constraints on additional higgs bosons ...... 21
vi Projections at 14 TeV for Dark Matter Searches in the monojet final state using the upgraded CMS Detector ...... 21
N=2 seven-dimensional SO(4) gauged supergravity from eleven dimensions ...... 21
Search for the standard model Higgs boson produced by vector-boson fusion and decaying to bottom quarks ...... 22
Photon Generation in a One Dimensional Oscillating Cavity with a Uniform Magnetic Field ...... 22
Dynamical Casimir Effect in an Oscillatory Cylindrical Cavity on a Magnetized Background ...... 23
Development of Charm quark Tagger at the CMS Detector ...... 23
Influence of form deviation to diameter measurement of cylindrical master ...... 23
Development of AC High Voltage Measurement System with Digital Technique at NIMT 24
Development of microwave-infrared drying system for industrial prototype of STR20 pro- duction ...... 24
Determination of Density According to Test Method A1 (Two Different Reference Weights Weighed in Air) of OIML R111-1, 2004(E) ...... 25
Preliminary Study for the Establishment of Oscillation-Type Density Meter Calibration at NIMT ...... 25
Controlling output signal of frequency generator for NMR ...... 26
Using relative gravimeter to determine vertical gravity gradients at NIMT ...... 26
Discover the New Reality for Your Analytical Electron Microscope ...... 27
Development of a shear-wave generator for shallow seismic investigation ...... 27
New solitonic, periodic and chaotic behaviors of ion acoustic waves in a nonextensive electron-positron-ion plasma ...... 28
Generation of ozone in Dielectric Barrier Discharge and Its Application for Water Treat- ment ...... 28
Improvement of RD31 rice seed germination using DBD plasma treatment ...... 29
Development of cost effective plasma technology at university of Malaya ...... 29
Development of 3.3 kJ Small Plasma Focus for Medical Radioisotopes Production: Prelimi- nary results ...... 30
Metal nanoparticles synthesis using atmospheric pressure micro discharge jet ...... 30
High-Quality Pure Cubic GaN on Patterned GaAs (001) Substrates with [110]-Oriented Stripes by MOVPE ...... 31
Controlling the thickness of silicon dioxide shell of iron boride nanoparticles ...... 31
vii Fabrication and Characteristic of BaTiO3 Based Ceramic by Molten Salt Synthesis . . . . 32
Mie Scattering by Small Sphere Particles ...... 32
Chemical Vapor Deposition (CVD) Synthesis of Graphite Encapsulated Magnetite Nanopar- ticles for Counter Electrode of Dye-sensitized Solar Cells ...... 33
Giant Dielectric Permittivity and Low Dielectric Loss Tangent in Yb-doped CaCu3Ti4O12 Ceramics ...... 33
Phase Formation and Microstructure of Sodium Niobate Powder Synthesized Using Molten- salt Technique ...... 34
*In situ* XANES Study of MnO2 Electrode for Supercapacitors ...... 34
Rapid thermal annealing and structural properties of lattice-matched InGaPN on GaAs (001) grown by MOVPE ...... 35
Synthesis of Carbon-Encapsulated Fe3O4 for Supercapacitors Electrode ...... 35
Characterizing Electrical Properties of ZnO Nanowires with Scanning Probe Microscopy 36
Synthesis and Characterization of Cu2−xTe Quantum Dot on ZnO Nanoparticles . . . . 36
Improvement of Graphene-Metal Contacts by Current-Induced Cleaning ...... 37
Neutron spectrometry for radiation protection purposes ...... 37
Design of a BSA for Producing Epithermal Neutron based on D-T Neutron Source for BNCT ...... 38
Modelling and experimental investigations of irradiation effects in Si radiation detectors 38
Opening ceremony ...... 39
Greeting ...... 39
An optical surface measurement for laser removal of graffiti ...... 39
Arc Discharge Drawing Silica Nanowires ...... 40
Cuvette’s effect correction for practical light-scattering experiment ...... 40
Measurement of linear thermal expansion by using fiber optic displacement sensor method ...... 41
The Development of Proving an Existence of Single Photon by Three Detectors . . . . . 41
Simulation of circular polarization filter in 1D chiral photonic crystal structure with defect using FDTD method: oblique incidence ...... 42
Teaching Physics, Conservation Laws First ...... 42
Teaching Problem-Solving Strategy in Circular Motion to First-Year Science Students . . 42
The Use of Interactive Lecture Demonstration to Teach High-School Physics in Magnetic Force on a Moving Charged Particle ...... 43
viii Measurement of Triboelectric Charges by Using Faraday’s Cage and Darlington Transistor Circuit ...... 43
Investigating ideas of Phayao high school students about Kepler’s law motions and Classi- cal Mechanics ...... 44
Using Modules to Teach Conservation of Momentum to High-School Students ...... 44
A surveying of high school students’ understanding of buoyant force ...... 45
Enhancing Students’ Understanding in Simple Harmonic Motion by Using Video Analysis 45
A Robust and Scalable Framework for Question-Answering in Physics ...... 46
The silent killer of learning ...... 46
Students’ physics laboratory skill in measurement and uncertainty ...... 47
Team Teaching in First-Year Physics Class ...... 47
Physics students’ understanding and problem-solving process of Gauss’s law ...... 47
A Possible Route to Reverse Declining Trend in Student Performance at First-year Univer- sity Physics Course ...... 48
Celebrating Hundred Years of General Relativity ...... 48
The string theory – condensed matter flirtation: an eyewitness account ...... 49
HRH Princess Maha Chakri Sirindhorn’s Initiatives in S&T for the well-being and benefit of Thai citizens ...... 49
Black silicon and the quest for intermediate band semiconductors ...... 49
Development of MeV Carbon-ion PIXE ...... 50
Zn(O,S) Thin Films Deposited by Pulse–DC Magnetron Sputtering for an Alternative Cd- Free Buffer Layer ...... 50
Dye-sensitized solar cell using a natural dye extracted from Artocarpus lacucha . . . . . 51
Analytical Black Hole Solution in dRGT Massive Gravity ...... 51
Electrical Resistivity of Ti-Ga-P Thin Films Synthesized by Asymmetric Bipolar Pulsed-DC Magnetron Sputtering ...... 52
Numerical investigation of transmission of graphene based one-dimensional photonic band- gap structure ...... 52
Determination of Arsenic in Soil, Vegetables and Hair in Khoa Ron Na - Suangchan subdis- trict area, Amphoe Ronpibul Using Neutron Activation Analysis Technique . . . . . 52
Increasing of wettability of silk powder using the atmospheric pressure plasma jet treat- ment ...... 53
Formation mechanism and mechanical properties of titanium oxynitride (TiOxNy) thin films deposited by reactive dc magnetron sputtering ...... 54
ix Neutron Attenuation Performance of Barite Concrete Samples ...... 54
Influence of Asymmetric Electromagnetic Field Distributions in an RF-gun on Electron Beam Properties ...... 54
Effect of Gd substitution for La on the structure and magnetic properties oftheLa1−x−ySrxGdyMnO3 nanoparticle ...... 55
Pulsar navigation using Doppler Effect ...... 55
A Study the Star Formation of Galaxies in a Nearby Galaxies Group ...... 56
A gridded planar probe as a plasma diagnostic tool in a dc magnetron sputtering . . . . 56
Investigating spectral response of CuIn1−xGaxSe2 thin film solar cells by quantum effi- ciency measurements ...... 57
The properties of Traversable Wormholes ...... 57
Incorporation of Cu-Se to Cu-Ga-In precursors for the fabrication of CuIn1−xGaxSe2 thin film solar cells ...... 58
Development of C-shape Dipole Electromagnet as an Electron Energy Spectrometer . . . 58
Hybrid bulk-heterojunction solar cells based on poly(3-hexylthiophene) and ZnO nanos- tructures ...... 59
Trajectory Simulation of Ion Beam from Duoplasmatron Ion Source ...... 59
Characterizations of PZT films prepared by sol-gel spin coating method ...... 60
Growth of graphene triangles and stripes on Si-face SiC (0001) ...... 60
Development and Dose Evaluation of Natural Topaz for Dosimeter Radiation ...... 60
Estimation Density and Viscosity of Ethyl-Biodiesel from Saponification Number and Io- dine Value ...... 61
A small vertical axis wind turbine ...... 61
Study of a 270-degree non-dispersive bending system...... 62
Dye-sensitized solar cell based on hydrothermally deposited NiS counter electrode . . . 62
TNT Photometric Reverberation Mapping campaign of High-z Quasars ...... 62
Single Beam Digital Holography using Total Internal Reflection ...... 63
Developing and demonstrating the investigation of fingerprints on a glass surface by using digital holography technique...... 63
Analysis of Color Magnitude Diagram by Aperture Photometry Tool ...... 64
Study of Undulator Radiation from Femtosecond Electron Bunches ...... 64
Radiological Hazard Assessment and Radioactive Contour Maps in Surface Soil Samples Collected from Satun Province, Thailand ...... 65
x Synthesis and Characterization of amorphous carbon film for potential application in cell culture ...... 65
An Application of Synchrotron-based X-ray Absorption Spectroscopy Study on Advanced Functional Materials ...... 66
A Study of the Orbital Period of a Binary System V2790 Ori ...... 66
An application of Optical Coherence Tomography (OCT) to measure sucrose concentra- tions ...... 67
Study and analysis of the new eclipsing PCEB system: SDSS J074548.63+263123.4 . . . . 67
Postharvest longevity of Longkong fruits by waxing with Chitosan solution and incorpo- rated with gamma irradiation ...... 68
Properties of Sputtered ZnO:Al Film on Flexible Substrates ...... 68
Decay of Hexaaquo Nickel(I) and Zinc(I) Ions in High Temperature Water ...... 69
Cold atmospheric pressure plasma diagnostics using an UV-absorption spectroscopy . . 69
Characterization of Plasma Conditions for Reactive Pulsed DC Magnetron Sputtering Sys- tem ...... 70
Beam loss monitor system at SPS storage ring ...... 70
Optical phase conjugate from cerium doped barium titanate at wavelength 632.8 nm . . 70
The Use of SMD-473 as a Potential X-ray Accidental Dosimeter through the Thermolumi- nescene Properties ...... 71
Study and Development of Current Transformers for Measuring of Electron Beam Pulse Current ...... 71
A study of β-Cu(In,Ga)3Se5 effects on Cu(In,Ga)Se2 thin film solar cells ...... 72
Influence of thickness reduction for CGS/CIS/CGS absorber layer on solar cell performance ...... 72
Prediction of fusion power in DEMO reactor under various scenarios using integrated pre- dictive modeling code ...... 73
Fabrication of 3D-hybrid (TNT/Au) Nanoarrays As Substrate for Surface-Enhanced Raman Scattering Detection ...... 73
Characterization of the New CCD Camera for Neutron Tomography at the Thai Research Reactor-1/Modification 1 ...... 74
Measurement of Specific Activities of Natural Radionuclides (40K, 226Ra and 232Th) in Beach Sand Samples from Soisawan Beach of Thepha District in Songkhla Province (Thailand) ...... 74
Synthesis and characterization from Zn1-xCoxFe2O4 nanostructures prepared by hydrother- mal method ...... 75
xi Effects of Substrate Materials on Structural and Magnetic Behaviors of Co-Cu Film Prepared by RF-sputtering ...... 75
Laser Welding with Inert Gas of Various Jewelry Designs ...... 76
Surface modification of polysulfone by plasma techniquce ...... 76
Comparison of electrical properties of LaSrCoFe films prepared by suspension and by gel coating method ...... 76
Study of pulsation spectrum of primary, rapidly-oscillating mass-accreting component of VV UMa ...... 77
Pulsar Search with PMPS Monitoring Dataset ...... 77
Theoretical investigation on the geometrical symmetry and electronic behavior of thethree lower members of diamondoids by using first-principles calculations ...... 78
Groundwater investigations in Patiw, Chumphon ...... 78
Study effects staging time and floor life of epoxy material to reliability performance . . . 79
Effect of post mold cure ramp down temperature on internal package stress for ICplastic packages...... 79
Correlation factors of wire sweep between wire bond and mold to establish process design rule ...... 80
Superhydrophobic Surface Modification Based on PTFE Coated AAO Template . . . . . 80
Phase imaging of cancer cell using compressive sensing apply to digital holography . . . 81
Optical property of titanium-doped ZnO thin film prepared using dc magnetron sputtering technique ...... 81
Measurement of Specific Activity of Natural (40K, 226Ra and 232Th) and Anthropogenic (137Cs) Radionuclides in Bottled Drinking Water in Phuket Province (Thailand) Using Gamma Ray Spectrometry Technique ...... 81
SLRI Beam Test Facility Development Project ...... 82
Pressure distribution of the SPS storage ring ...... 82
Smartphone in teaching Physics ...... 83
Analysis of Biological Effect inside Human Body Exposed to Extremely Low Frequency due to Overhead Transmission Lines ...... 83
Development of Portable Desk Lab for High School and University Physics ...... 84
Simulation and Experimental Study of Vibration Characteristics of Thai Traditional Brass Gong ...... 84
Surveying Students’ Conceptual Knowledge of Fluid Mechanics ...... 85
The Role of Core Hole Effects on Calculated Resonant Inelastic X-Ray Scattering Spectraof Graphene ...... 85
xii Simple Thick Lens Made of a Bottle Filled with Liquid ...... 86
Stability Diagram of a Serial Quantum Dot System ...... 86
High pressure properties of I-III-VI2 compounds from ab initio calculation ...... 86
Study of Butea superba. Roxb Root (Red Kwao Krua) Extract on Sex Reversal of Nile Tilapia by using Exponential Decay Pulse-Electric Fields ...... 87
Ga acceptors in SnO2 revisited: A hybrid functional study ...... 88
Calculation of Average Charge Number on the Single Electron Transistor by Quantum Monte Carlo Method ...... 88
Classification of arabica by electronic tongue ...... 88
The Development Of Scientific Concept of “Momentum And Regarding Collision” ForGrade 10th Students Though Leaning Activities Based On The Predict-Observe-Explain (POE) Method ...... 89
Transport of Macromolecules through Glomerular Basement Membrane ...... 89
Designing an Inquiry-based Learning Approach about Force and Pressure to Enhance Ele- mentary Students’ Critical Thinking Skills ...... 90
Development of 68Ga-peptide for Positron Emission Tomography Tracer ...... 90
Comparisons of Students’ Responses Relating to Buoyancy Force Between Two Different Teaching Approaches ...... 91
Teaching strategies to facilitate students’ use of mathematics when solving physics prob- lems ...... 91
Using a Terminal Block as a Protoboard for the Development of Concepts related to Simple Direct Current Circuits ...... 92
A Second-Quantization Approach to the Analytical Faraday Effect in Graphene . . . . . 92
Thermodynamics of a Rubber Balloon ...... 92
Investigation of Students’ Moral Reasoning in Learning Physics Laboratory ...... 93
Sequential Signal Generator for Yeast Separations ...... 93
Electronic band structure of Hydrazine-water doped Single-Walled Carbon Nanotubes as n-Type Semiconductor ...... 94
An Effective Hands-On Experiment in Light and Optics for Grade 10 Students ...... 94
Developing concept of a frictional force by using predict-observe-explain (POE) technique ...... 95
The development of scientific concepts on motion in uniform field of grade 10students through Predict-Observe-Explain (POE) with video demonstration...... 95
The development of scientific concept on electrostatics of grade 11 student through Predict – Observe – Explain (POE) ...... 96
xiii Effect of water vapour on neutron detection of cosmic rays ...... 96
Crystal and electronic structures of Li2Ti6O13 for lithium-ion batteries ...... 97
Comments on holographic star and the dual QGP ...... 97
To design learning activities for the interference and the diffraction of light by using the learning package coorperate STAD techniqe : a case of secondary high school. . . . 98
Cambodian Students Understanding of Forces and Motions: A Comparison with US, Aus- tralian, Japanese and Thai students ...... 98
Using colour light mixer cooperate with CIPPA model to teach primary colour light and their mixed: A case of secondary high school students...... 99
Structural phase transition of binary compounds of TlX (X = N, P, As) under high pressure : An ab initio Study ...... 99
Developing Analysis Skills about electrical DC circuit by Virtual board on Ohm’s law . . 100
Application of Role-playing Game Strategies in Teaching and Learning High School Physics ...... 100
Applying the Michael and Wittmann’s Framework to Analysis of the Force and Motion Conceptual Evaluation Test ...... 100
Using Active Workbooks as a Tool to Develop Concepts and Problem-solving Skills in Work and Energy ...... 101
The Development of Concepts of Grade 11 Students on Resistor Circuit Through Predict- Observe-Explain (POE) Approach ...... 101
Applying Michelson Interferometer for Coherence Length Measurement of Laser Light . 102
Enhancement of oil Palm (Elaeis guineensis Jacq.) by Magnetically treated Water . . . . 102
Creation of 3D information from 2D images ...... 103
A Study of Capacitively Coupled Contactless Conductivity Detection (C4D) Electrode Con- figurations on Signal Detection Sensitivity ...... 103
Development of light detector for Michelson Interferometer experiment Instrument . . . 104
Surveying of high-school students’ ability in drawing free-body diagrams ...... 104
Pre-Service Physics Teachers Expectations in Learning Physics ...... 105
Carbon screen-printed electrode/Graphene-PEDOT:PSS/Prussian blue/PEDOT-AuNPs for electrochemical immunosensor application...... 105
Automatic Marking System for Basic Physics Laboratory ...... 106
Search for the Standard Model Higgs boson in ZZ* to 4μ decay channel with the CMS experiment at √s = 8 TeV ...... 106
Preliminary Investigation of Heat Transfer and Thermal Distribution in Computer Main- board based on Finite Element Analysis ...... 106
xiv Developing Scientific Concepts on Magnetic and Electric Field using Simple Experiment and Multimedia Learning ...... 107
Health Determinations of Yeast Suspensions for Brewery Industry using Cell Velocity Spec- trum ...... 107
Mathematical Analyze of Breakdown Transmembrane Potentials of Fish Eggs using Hen- egg model ...... 108
Pulse-Electric Fields Inductions for Preliminary Sex Reversal of Blue-Spotted Coral Trout 109
Electrical sex reversal of Nile tilapia from prototypes toward commercial product . . . . 109
Surveying Physics Teaching Strategies in Three Leading Schools ...... 110
The study scientific concepts about conservation of mechanical energy in before andafter learning through Predict-Observe-Explain approach for Grade 10 Students ...... 110
Development of weather station for wind direction, wind speed and temperature measure- ments ...... 111
Analysis of Students’ Task Relating to Boyle’s law, Charles’s law and Kinetic Energy for Gases...... 111
Electronic Tongue as an Alternative Tool for Classifying Oil-Based Products ...... 112
The Determination of the Area of Origin in Medium Velocity Blood Spatters: Numerical Methods Approach ...... 112
Developing STS Projectile Motion Unit for Providing Students’ perception of the relation- ship between Science Technology Engineering and Mathematics ...... 113
Electronic and dynamical properties of YHx (2.83 < x ≤ 3.00) ...... 113
Sound absorption of oil palm trunks ...... 114
Using Simple Experiments incorporated with a Laboratory Group Investigation Model to Develop Conceptual Understanding of Static Electricity ...... 114
The development of scientific of concept on electric current of grade 11 students through Predict – Observe – Explain : Classroom – Based Action Research ...... 115
High pressure properties of doped ZnO from ab initio calculation ...... 115
Micron-size Electrodes Fabrication for Capacitively Coupled Contactless Conductivity De- tection (C4D) ...... 116
The effectiveness of learning with guided lecture worksheets designed based on students’ learning difficulties ...... 116
First principles calculations of cation-ordering effects on electronic band structure ofZn- SnN2 and ZnGeN2 ...... 117
IR spectroscopy of O-related defects in CdSe ...... 117
Effect on the Mg2Si Synthesized by Solid State Reaction and Hot Pressing Process . . . . 118
xv Characterization and Analyzation of Chitosan from Paphia Undulate Shell ...... 118
Comparative Study of Effects of Metal Oxides Modifications on Properties ofPb(Mg1/3Nb2/3)0.9Ti0.1O3 Ceramics ...... 119
Fabrication of CsSnI1−xFx Doped with ZnO for Photogenerated Holes in Solid-state Dye- sensitized Solar Cells ...... 119
Giant Dielectric Properties and Electrical Response Grain Boundary of Na1/3Ca1/3La1/3Cu3Ti4O12 Ceramics ...... 120
Production of Biodiesel through Transesterification of Palm Oil Using Waste Eggshells Cat- alyst ...... 120
Strain modification of MOVPE grown cubic GaN on GaAs (001) with GaN/AlGaN multi- interface buffer layer ...... 121
New Dye Sensitizers from Anthraquinone Derivatives for Application in Dye-Sensitized Solar Cells: a DFT Study ...... 121
Investigation of Elastic Property of Thermoelectric Materials Prepared by Bridgman Method ...... 122
The Study of Fuel Pellet from Cassava ...... 122
Synchrotron X-ray Absorption Spectroscopy Study of Local Structure in Hydroxyapatite Doped by Strontium ...... 123
Metal Decorations on Graphene as a Hydrogen Storage Material ...... 123
Characteristics of AZO/Ag/AZO Tri-layer Film by RF-sputtering ...... 124
Thermal and Electrical Properties2 ofP O5-CaO-Na2O Glass Containing Ba0.6Sr0.4TiO3 . 124
Nano-materials from Rice Husks for Lithium Ion Battery Applications ...... 124
Improvement of Mechanical Properties of Rattan Fiber–reinforced/Carbon Nanotube/Epoxy Resin Composites by Alkaline Treatment Method ...... 125
The Effect of Calcination Temperature on the Dielectric Properties of (1−x)BaZr0.25Ti0.75O3+xSrFe0.5Nb0.5O3 ceramics ...... 125
Effects of Zn Substituted on the Structure of Hydroxyapatite Synthesized from Waste Chicken Eggshells ...... 126
Fabrication and mechanical properties of doped-hydroxyapatite composite...... 126
Synthesis Thermoelectric Material Mg2Si by Quartz Tube Vacuum Furnace from Starting Mg Powder and SiO2 Rice Husk ...... 127
Structural Investigation of Strontium Lead Silicate Glass Prepared from Silica Gel Waste Using Ultrasonic and FTIR Spectroscopy ...... 127
Lifetime Span Comparison of Self-Cleaning Glass Annealed by Laser and Furnace Heat Treatments ...... 127
Synthesis and Characterization of Iron-doped Hydroxyapatite by Sol–Gel Method . . . . 128
xvi The Effect of Calcination Temperature on the Properties of the NiOFilms ...... 128
Simulation and Design High-temperature Microwave Furnace for Thermoelectric Material Synthesis ...... 129
Micro-structural Investigation of InGaAsN Lattice-matched Films Grown on Off-angle Ge (001) Substrates by MOVPE ...... 129
Effect of Temperature on Electrical Properties 3of BaCeO Ceramics ...... 130
Synthesis and Electrochemical Properties of SnO2 Nanostructures via a Hydrothermal Method for Li-ion Batteries...... 130
Study of Thermoelectric Structure Prepared by Hydrothermal Method ...... 131
Raman scattering of the N-related vibrational modes in high N-content GaPN films grown on GaP (001) substrates by MOVPE ...... 131
Structural and elastic properties investigation of recycle silica gel glass by FTIR and ultra- sonic technique ...... 132
Synthesis, Optical and Magnetic Properties of CuCr1−xFexO2 Delafossite Oxide . . . . . 132
The Study of Spin Seebeck Effect on Iron Alloy...... 133
Substrate Surface Orientation Dependent GaN Grown on GaAs by MOVPE ...... 133
CdS/CdSe Co-sensitized on Different TiO2 Morphologies and its Application to Quantum Dot-sensitized Solar Cells (QDSSCs) ...... 134
Effect of Fabrication Method on the Structural and Magnetic Properties of Copper Ferrite 134
Sonochemical Synthesis of ZnO Nanospheroid ...... 135
Effect of Eu3+ Concentration on Crystallization and Luminescence Properties of CaO-MgO- Al2O3-SiO2-ZnO Glass-Ceramics ...... 135
The Effect of CaO from Cassava Rhizome to Structural and Elastic Properties ofStrontium- borate Glass Systems ...... 136
Controlled Growth of ZnO Nanostructures in Hydrothermal Process on ZnO Seeds Layer Synthesized with Different Precursor Concentrations ...... 136
Influence of LiSbO3 on Microstructure and Electrical Properties of Bi0.5(Na0.80K0.20)0.5TiO3 Ceramics ...... 137
WS2 Nanoparticles and Multiwalled Carbon Nanotubes Counter Electrode for Dye-sensitized Solar Cells ...... 137
Crystallization and Dielectric Properties of Nd3+ Doped Ferroelectric Glass-Ceramics in the Na2O-BaO-Nb2O5-SiO2 System ...... 137
Influences of Sn Doping and CaTiO3 Volume Fraction on Microstructure and Electrical Response of Sn-doped CaCu3Ti4O12/CaTiO3 Composites ...... 138
Gamma-ray Shielding and Structural Properties of P2O5-BaO-Bi2O3 Glass System . . . . 138
xvii Characterization and Magnetic Properties of Fe-doped MgO Nanoparticles ...... 139
Formation and Structure of ZrO2 Added Hydroxyapatite Synthesized from Waste Eggshells ...... 139
Preparation and Characterization Chitosan/Hydroxyapatite Composites from Waste for Bio-applications ...... 140
Phase Transition of LiMn0.85Cr0.15PO4 Cathode Material by In-Situ Time-Resolved XANES ...... 140
Education fuel pellets made from cassava and coffee grounds...... 141
Fabrication of Porous Ceramics for Controlling the Release of Bioactive Compounds in Combating Bee Parasites in Bee Hive ...... 141
Photocatalytic Properties of Hydrogenated Titanium Dioxide Thin Films Prepared by Spark- ing Method ...... 142
Synthesis and Characterization of Vanadium Oxide Film by Sparking Method for Ther- mochromic Application ...... 142
Characterization of Ce1−xPrxO2 was Synthesized by a Co-precipitate Method...... 143
Effect of Annealing on Magnetic Properties1 ofSrTi −xCoxO3 Nanoparticles Prepared by Hydrothermal Method ...... 143
Effects of Substrate Materials on Optical Behavior of ZnO:Al Film Prepared by RF-sputtering ...... 143
Fabrication of Electrospun LiFePO4/Carbon Composite Fibers as a Cathode Material for Lithium-ion Batteries ...... 144
Effect of Annealing in Reducing Atmosphere on Dielectric Properties ofCaCu3Ti4O12/CaTiO3 Composites ...... 144
Synthesis Thermoelectric Material Mg2Si by Quartz Tube Vacuum Furnace from Starting Mg Powder and SiO2 Rice Husk ...... 145
Synthesis of Gold Nanorods with Different Aspect Ratios for Sensing Applications . . . 145
Preparation and dielectric properties of poly (vinylidenefluoride hexafluoropropylene) fibers ...... 146
The Equipment for Crystal Growth Based on the Hydrolysis Technique ...... 146
Strongly Enhanced Dielectric Response and Dielectric Relaxation in BaTiO3/poly(vinylidene fluoride) Nanocomposites ...... 147
Effect of Sintering Temperature on Behavior of Grain Shape and Grain Growth ofZn0.97Cu0.01V0.02O Ceramics ...... 147
Effect of Annealing Temperature on the Magnetic Properties of Fe 3Doped SrTiO Nanopa- picles ...... 148
Effects of Reagent Concentration and Ultrasound in the Co-precipitation Synthesis of Maghemite Nanoparticles Studied by Synchrotron X-ray Absorption Spectroscopy ...... 148
xviii Enhancing the Cycling Stability of SnO2 Hollow Spheres for a Li-ion Battery Anode by Titanium Dioxide Coating ...... 149
Dielectric Properties of 0-3 Barium Zirconate Titanate˗Portland Cement Composites at 40% BZT Content with Carbon Addition ...... 149
Microstructure and Impedance Properties of Sr0.4Ca0.6La4Ti5O17 Ceramics Doped with ZnO ...... 150
Effects of Oxygen Vacancies on Dielectric Properties ofNa1/2Bi1/2Cu3Ti4O12 Ceramics Prepared by a Urea Combustion Method ...... 150
Enhanced Dielectric Response in Na1/3Bi1/3Ca1/3Cu3Ti4O12/PVDF Composites by Filling with Ni Nanoparticles ...... 150
The effect of ZnO on the kinetic parameters of thermoluminescence window glass exposed to photon irradiation ...... 151
Improvement of Bar Bonding Method for Heat-Assisted Magnetic Recording Head . . . . 151
The Effect of Doping Cu2O on Elastic and Structural Properties of Thermoluminescent Glass 90RWG – 10Na2O – xCu2O ...... 152
Portable pesticide analyzer: a project overview ...... 152
ISFET: technical background and commercialization aspect ...... 152
Water-gated OFETs for Pesticide Detection ...... 153
Imprinted expended gate Field-Effect transistor for pesticide detection ...... 153
Acetylcholinesterase/gold nanoparticle/mesocellular foam silica biosensor for pesticide de- tection in real samples ...... 154
AChE/agarose gel Coated on ISFET for Methyl-Parathion Sensors ...... 154
Modified kinetic Monte-Carlo algorithm based on fluctuation theorem ...... 155
The relativistic-like Lagrangian : Multiplicative form ...... 155
Effect of Argon Pressure on the Structural and Optical Properties of RF-Sputtered ZnOThin Films ...... 156
Effect of growth parameters and gamma ray irradiation on luminescence properties ofEu- doped barium titanate thin films ...... 156
Polysulfone Gas Separation Membrane: Effect of Evaporation Time on Morphology and Mechanical Strength ...... 157
Excursion ...... 158
Application of hyperscaling violation in QCD ...... 158
Study on Transverse Emittance Measurement of Electron Beams from the Thermionic Cath- ode RF-gun ...... 158
Feasible of an ethanol perform on pristine and p-doped single walled carbon nanotubes . 158
xix xx Siam Physics Congress 2015 / Book of Abstracts
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 202
A galaxy rotation curve from a modified Newtonian model based on Mach’s principle
Author: Rak Chitchamnong1
Co-authors: Alejandro Saiz Rivera 1; Michael Allen 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 Thailand
Corresponding Author: [email protected]
The rotation curve of the visible stars and gas in a galaxy can be presented by plotting itsorbital velocity. However the galaxy rotation curve obtained by using the relation of Newton’s universal gravitation fails to explain the observed rotation curve. This has led to the dark matter hypothesis. At present there is no direct evidence for the detection of dark matter and the area is still open for an alternative. In this work, we present a computer simulation for the galaxy rotation model. Our simulation can show that the galaxy rotation curve simulated by using the Newtonian relation is incorrect as expected. Instead of pursuing the dark matter hypothesis we introduce a relation of central force between matter based on Mach’s principle. By combining the Newton’s universal gravitation with this relation we will show the corresponding galaxy rotation curve.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 218
CMB cold spot anomaly from cosmic void
Author: Anut Sangka1
Co-authors: Nuanwan Sanguansak 1; Utane Sawangwit 2
1 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 2 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
One of the strongest evidence of the currently favoured standard ΛCDM (Lambda cold dark matter) model with the Big Bang origin came from the Cosmic Microwave Background (CMB) radiation measurement which show us the average temperature of the universe is 2.725 K with the Gaussian fluctuations of about 18 µK RMS. However there presents some anomalies that can be observed by CMB experiment. One of strange structures is the cold spot anomaly originally detected by NASA WMAP and now confirmed by the ESA Planck satellite mission. The temperature ofthe large cold spot is significant lower than average temperature. Moreover the size of the cold spot is notably larger than expectation, it radius is 5◦ on sky. One of the best explanations of this cold spot is the integrated Sachs-Wolfe effect (ISW) cause by a single large cosmic void. Many research used Lemaître-Tolman-Bondi (LTB) metric embedded in ΛCDM background to construct cosmic void and determine ISW effect for explanation of the large cold spot but they ignored the small-scale effect from weak gravitational lensing. In this research we try to calculate ISW effectandweak lensing effect from LTB metric. In addition we used another cosmic void density profile fromN- body simulation (Hamuas et,al 2014) to evaluate both ISW effect and weak lensing. And finally both results of LTB metric and cosmic void density profile will be compared to each other.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 234
Variations in the Neutron Time Delay Distribution at the Princess Sirindhorn Neutron Monitor
Page 1 Siam Physics Congress 2015 / Book of Abstracts
Author: Alejandro Sáiz1
Co-authors: Burin Asavapibhop 2; Chanruangrit Channok 3; Chawewan Chaiwattana 4; David Ruffolo 1; John M. Clem 5; John W. Bieber 5; Kazuoki Munakata 6; Manit Rujiwarodom 2; Nattapong Kamyan 1; Nipon Gasiprong 4; Paisan Tooprakai 2; Paul Evenson 5; Pierre-Simon MANGEARD 7; Supon Sumran 4; Suttiwat Madlee 1; Tanin Nutaro 4
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 Thailand 2 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand 3 1.Department of Physics, Faculty of Science, Ubon Ratchathani University, Warin Chamrap, Ubon Ratchathani 34190, Thailand, 2.Rajamangala University of Technology Isan, Nakhon Ratchasima, 30000, Thailand 4 Department of Physics, Faculty of Science, Ubon Ratchathani University, Warin Chamrap, Ubon Ratchathani 34190, Thailand 5 Bartol Research Institute, University of Delaware, Newark, DE 19716 6 Department of Physics, Shinshu University, Matsumoto 390- 8621, Japan 7 1.National Astronomical Research Institute of Thailand, Chiang Mai, 50200 Thailand 2.Department of Physics, Fac- ulty of Science, Mahidol University, Bangkok 10400 Thailand
Corresponding Author: [email protected]
The Princess Sirindhorn Neutron Monitor (PSNM) has operated since late 2007 at the summit of Doi Inthanon, Thailand’s highest mountain, in Chiang Mai province. PSNM records the flux of galactic cosmic rays (GCRs) impinging on Earth’s atmosphere, as well as the GCR flux variations with time due to solar activity. PSNM has the world’s highest cosmic ray vertical cutoff rigidity (momentum per charge) for a fixed station, 16.8 GV. The recorded count rate comes fromthe 10 detection of nuclear disintegrations of B in BF3-filled proportional counters, mostly due to interactions with neutrons evaporated from the Pb producer when hit by a cosmic-ray-generated atmospheric shower particle (usually a neutron). In addition to monitoring the count rate, the PSNM electronics can record neutron time delays (the time between one count and the next) in each counter. An analysis of time delay histograms shows an exponential tail at long times (> 1 ms) that can be interpreted in terms of chance coincidences, i.e., counts associated with independent atmospheric particles. Shorter time delays, however, are dominated by counts originating from the same interaction between a Pb nucleus and an atmospheric particle. This component contains information about the energy distribution of atmospheric shower particles and, thus, about the GCR energy spectrum as well, and its variations with time are of interest. In this work we analyze neutron time delay histograms from PSNM and derive the leader fraction L, i.e., the fraction of neutron counts not associated with a previous count in the same counter from the same nuclear interaction. We report on variations of L with time, their dependence on atmospheric depth and water vapor pressure, and show that, after correcting for these environmental effects, the remaining variations are of interplanetary origin. This represents a qualitatively new type of observation in the 60-year history of neutron monitor science.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 190
Follow-up Photometry of New Eclipsing PCEBs from the Sloan Digital Sky Survey: SDSS J214140.43+050730.0
Author: Kittipong Wangnok1
Co-authors: Nuanwan Sanguansak 1; Puji Irawati 2; Tom Marsh 3; Vik Dhillon 4
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1 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 2 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand 3 Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom 4 Department of Physics and Astronomy, University of Sheffield , Sheffield S3 7RH,UK
Corresponding Author: [email protected]
Post common-envelope binaries (PCEBs) are known as one of the end products of the complex common-envelope process. These systems typically consist of white dwarf star with a lowmass companion. While most of PCEBs usually have short orbital periods of a few hours, some systems are found to be in long (>1 day) period. In this work, we present the preliminary result of our follow-up photometric observation on SDSS J214140.43+050730.0 by using the 2.4m Thai National Telescope with ULTRASPEC instrument. The system is a new cataclysmic variables (CVs) which is listed among the recently found white dwarf main sequence binaries from the Sloan Digital Sky Survey. The observation for SDSS J2141+0507 is done on 9th, 22nd, 24th and 25th December 2014 in the SDSS g′ filter, KG5′ filter, r′ filter and i′ filter, respectively. Our preliminary result on SDSS J2141+0507 show that T0(HJD) and an orbital period are 2457014.00774986 and 0.05469 days, respec- tively.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 68
Photometric Observation and Analysis of Hot Uranus Exoplanet GJ3470b by Transit Method
Author: Sawatkamol Pichadee1 Co-authors: Siramas Komonjinda 1; Supachai Awiphan 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, M13 9PL, UK
Corresponding Author: [email protected]
GJ3470b is a Uranus-mass exoplanet, orbiting around M dwarf (Bonfils et al. 2012). In this work, R-filter transit observations were conducted by using the 0.5-meter telescope at Thai NationalOb- servatory (TNO) and the 0.6-meter telescope at Cerro Tololo Inter-American Observatory (CTIO) in 2013-2015. From the light curves, the orbital elements of GJ3470b were obtained. In addition, the time of minima which obtained from observed data were used to compute O-C diagram. The result reveals that there is no major change in orbital period of GJ3470b.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 137
Magnetic Field Line Random Walk in Isotropic Turbulence at Very High Kubo Number
Author: Wirin Sonsrettee1 Co-authors: David Ruffolo 2; Prachanda Subedi 3; William Matthaeus 3; andrew Snodin 4; pat wongpan 5; piyanate Chuychai 6
1 Faculty of Engineering and Technology, Panyapiwat Institute of Management, Nonthaburi 11120, Thailand 2 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand 3 Bartol Research Institute, University of Delaware, Newark, DE 19716 4 Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
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5 Department of Physics, University of Otago, Dunedin 9016, New Zealand 6 School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Corresponding Author: [email protected]
Most of the field line random walk (FLRW) theories proposed in the past were strongly influenced by studies of the limit of weak fluctuations. In this limit, the behavior of the FLRW can be characterized by the Kubo number R = (b/B0)(ℓ∥/ℓ⊥), where b is the root mean squared fluctuation, ℓ∥ and ℓ⊥ are turbulence coherence scales parallel and perpendicular to the mean field B0, respectively. In the case of R ≪ 1, a quasi-1D limit, all theories and computer simulations agree that the FLRW is quasilinear. In the case of R ≫ 1, a quasi-2D limit, there are strong trapping effects in which some field lines are trapped in topological structures. Then the Corrsin-based theory is less accurate.To study the FLRW at high R, while avoiding the topological effects in the quasi-2D limit at high R, we examine different versions of Corrsin-based theory in the limit R → ∞ by taking B0 → 0 for finite b instead of taking ℓ∥/ℓ⊥ → ∞. Naturally, with B0 = 0, the FLRW is completely isotropic. We test the theory by performing computer simulations of the FLRW. All Corrsin-based theoretical results agree with simulation results for the FLRW at B0 = 0 (R = ∞). We conclude that the applicability of Corrsin-based theories is limited not by high R, but by quasi-two-dimensionality.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 145
Analysis of Peculiar Dips Changed of SDSS J102102.25+174439.9 Light Curve
Author: Khunagorn Chanthorn1 Co-authors: Nuanwan Sanguansak 1; Puji Irawati 2; Tom Marsh 3; Vik Dhillon 4
1 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 2 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand 3 University of Warwick, Conventry CV4 7AL, United Kingdom 4 University of Sheffield, Sheffield S3 7RH, United Kingdom
Corresponding Author: [email protected]
We followed up the new eclipsing white dwarf main sequence SDSS J102102.25+174439.9 with a short orbital period of 0.14 days from the Sloan Digital Sky Survey The system has been observed by using on the 2.4m telescope at the Thai National Observatory (TNO) with ULTRASPEC instrument. Our multi-band observations shows peculiar dips about 15 minute after the primary eclipse. Such dips in WDMS systems were only observed on one occasion of the light curve of QS Vir earlier. The dips in SDSS J1021+1744 are unique because they present in different wavelengths at approximately the same phase. It is possible that these dips are caused by the ejected materials from an active compan- ion star, such as in QS Vir. The light curve in g′ filter exhibits deep and narrow features, implying that the materials which pass in front of the white dwarf in SDSS J1021+1744 must be dense and small in size. Furthermore, the stellar and orbital parameters SDSS J1021+1744 are presented.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 55
On the role of short period Cataclysmic Variables from Catalina Sky Survey
Author: Sirinapa Arjyotha1 Co-author: Amornrat Aungwerojwit 2
1 Program of Physics, Faculty of Science and Technology, Chiang Rai Rajabhat University, Chiangrai, Thailand 57100
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2 Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
Corresponding Author: [email protected]
Cataclysmic Variables (CVs) are close binaries consisting of an accreting white dwarf and a low-mass main sequence companion. We have initiated in searching new CVs using their outburst properties with the primary aim to identify short-period systems which are rare but are great of importance to understand close binary evolution. Here, we present time-resolved photometry of new CVs in su- peroutburst discovery by Catalina Real-Time Transient Survey (CRTS). The observations have been carried out at 2.4 m Thai National Telescope, Doi Inthanon, and 0.6 m PROMPT8 telescope, located at Cerro Tololo Observatory, Chile. Superhump structure found in their light curves suggested that these CVs are short- period systems with the orbital period below the 2-3 h period gap. Furthermore, we will discuss recent status of CRTS CVs sample compared to the previously known CVs discovered by various means.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 227
Star Formation and Age-Metallicity Relation in a Galaxy Group NGC 4065
Author: Orarik Tasuya1
Co-authors: Utane Sawangwit 2; Wichean Kriwattanawong 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
We present a study of star formation, stellar age and metallicity, and interactions between galaxies in a low-redshift group, NGC 4065 group. Imaging data were taken from 2.4 meter telescopeat Thai National Observatory (TNO) for B, VandRC broadband filters and [S II] and Red-continuum narrowband filters. There are 21 galaxies in our sample. The star formation rate is represented by the equivalent width of hydrogen alpha (EW(Hα)). Stellar age and metallicity are examined by using the Medium resolution INT Library of Empirical Spectra (MILES) for the stellar population synthesis model predictions. The result shows that most of early type galaxies (ETGs) withEW(Hα)) in the sample galaxies less than 10 Å, gas-deficient galaxies, while late type galaxies (LTGs) show more EW(Hα) and bluer than the ETGs. That means star formation activity in the LTGs could be triggered by ram-pressure stripping and tidal interaction between galaxy members due to dense environmental effect in the compact group.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 73
Photometric Monitoring of Active Galactic Nuclei using the Thai Robotic Telescope in Chile
Author: Bovornpratch Vijarnwannaluk1
Co-authors: Malte Schramm 2; Wiphu Rujopakarn 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand 2 Kavli IPMU, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba, Japan
Corresponding Author: [email protected]
Page 5 Siam Physics Congress 2015 / Book of Abstracts
We report the ongoing variability monitoring program for a well-defined, flux-limited sample of active galactic nuclei (with Bj<18 mag) through a multi-band optical imaging using Thailand’s 0.6- m remotely-operated telescope at Cerro Tololo Inter-American Observatory, Chile. Our goal is to search for month-time scales outbursts to identify potential targets for spectroscopic follow-up to estimate the broad-line region size through reverberation mapping technique. We have developed a Python pipeline based on the publicly available SWARP or SExtractor to efficiently extract the photometry and produce light-curves in the B,V, and R bands. We typically achieve a consistent pho- tometric uncertainty of < 0.05 mag for targets at 14-15 mag under optimal conditions at an average cadence of two days or better for a number of objects during a 2014 - 2015. Here, we demonstrate the use of our machinery to monitor PG1302-102, which has recently been found to be the first candidate of a binary supermassive blackhole at sub-kpc distance, at accuracy approaching 0.01mag over 14 months.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 171
Angular Extension of Io Magnetic Footprint in Corresponding to Volcanic Activity on Io
Author: Suwicha Wannawichian1
Co-authors: John Clarke 2; Jonathan Nichols 3; Utane Sawangwit 4
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 Center for Space Physics, Boston University, Boston, MA 02215, USA 3 Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom 4 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
FUV images of Jupiter’s auroral region have been taken since the early observational era of the Hub- ble Space Telescope (HST). In the vicinity of the main auroral oval, an emission spot was detected and appeared to be evidence of electromagnetic interaction between Jupiter’s magnetospheric plasma and Io’s atmosphere. In previous works, the brightness of this emission, which is called Io’s auroral magnetic footprint, reveals strong correlation with Io’s location in Jupiter’s system III longitude. In 2007, with HST’s Advanced Camera for Surveys (ACS), the magnetic footprints of Io were observed, while the volcanoes on Io concurrently erupted. In this study, the magnetic footprint emissions were chosen regarding the variation of Io’s locations. Detailed analysis of the angular extension of Io’s magnetic footprint was presented. Based on the complexity of angular extension due to the multi- plicity of the footprint spots, the connection between angular extensions of Io magnetic footprints and the volcanic activity reveals some correlation. This result suggests the possible influence ofthe picked-up current on the extension of the interaction region between precipitating electrons and Jupiter’s ionospheric particles.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 36
Black hole in Massive Gravity and its thermodynamics
Authors: Lunchakorn Tannukij1; Pitayuth Wongjun2; Suchant G. Ghosh3
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand 2 The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000, Thailand 3 Centre of Theoretical Physics, Jamia Millia Islamia, New Delhi 110025, India
Corresponding Author: [email protected]
Page 6 Siam Physics Congress 2015 / Book of Abstracts
Massive gravity is one of the well-known modification of Einstein’s general relativity by promoting the massless mediator, so-called graviton, to be a massive one. As the modified gravity, it is natural to consider the black hole solution of the theory. Here we present the static spherically symmetric black hole solution in massive gravity, proposed by de Rham, Gabadadze, and Tolley, along with its thermodynamics descriptions. The solution we found is in the form of Schwarszchild solution with additional terms due to massive gravity, including the cosmological-like term without introducing a bare cosmological constant, which is quite natural in massive gravity. We also found that introducing the graviton mass also affects thermodynamical natures of the black hole. Furthermore, the phase structure of the solution is analyzed in order to investigate the thermodynamical stability of the black hole.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 285
The oscillation spectra of the oEA stars
Author: David Mkrtichian1 Co-authors: Alexander Savushkin 2; Eloy Rodriguez 3; Khamsinun Gunsriwiwat 4
1 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand 2 Crimean Astrophysical Observatory, Nauchny, Ukraine 3 Instituto de Astrofísica de Andalucía, CSIC, PO Box 3004, E-18080 Granada, Spain 4 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
We present results of study of oscillation of a sample of A-type mass-accreting components of Algol- type eclipsing binary stars (so called oEA stars). This work is a part of ongoing THAi Southern Survey for OEA Stars (THASSOS). High-precision photometry obtained at different observatories was used to investigate the low-amplitude acoustic variations of brightness of primary components. The new discovered oEA stars and detected acoustic oscillations are presented and discussed.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 124
Simulations of Polar-Region Atmospheric Ionization Induced by the Large Solar Storm on January 20, 2005
Author: Warit Mitthumsiri1 Co-authors: Achara Seripienlert 2; Alejandro Saiz Rivera 1; David Ruffolo 1; Pierre-Simon MANGEARD 3; Usanee Tortermpun 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 Thailand 2 Division of Physics, Faculty of Science, Rajamangala University of Technology Thanyaburi, Pathum Thani, 12110 Thailand 3 1.Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 Thailand 2.National Astronomical Research Institute of Thailand, Chiang Mai, 50200 Thailand
Corresponding Author: [email protected]
Ionizing radiation in the Earth’s troposphere is mainly due to Galactic cosmic rays, high-energy particles from outside the Solar System. Typical solar energetic particles do not have enough energy to penetrate to aircraft or cloud altitudes. However, occasionally solar storms can produce relativistic ions with such enormous intensity that their ionization effect in the Earth’s lower atmosphere is significant. One of the largest solar storms ever observed occurred on January 20, 2005,which resulted in very large increases in the count rates of ground-based particle detectors, especially near
Page 7 Siam Physics Congress 2015 / Book of Abstracts
the polar regions. We use data recorded by two neutron monitor stations located near the magnetic south pole (McMurdo) and north pole (Inuvik) to reconstruct particle energy spectra at the top of the atmosphere for each location as a function of time. We create realistic atmospheric models from measured meteorological data and use them along with the reconstructed particle flux to perform Monte Carlo simulations of particle-air interactions. We calculate atmospheric ionization at different altitudes and times during the 2005 solar storm for each location. The real-time ionization profiles obtained will be useful for studying aircrew health effects, correlations with cloud formation, and climate change.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 50
Can Dark Matter be a Bose-Einstein Condensate?
Author: Tiberiu Harko1
1 Department of Mathematics, University College London, Gower Street, London WC1E 6BT, United Kingdom
Corresponding Author: [email protected]
We consider the possibility that the dark matter, which is required to explain the dynamics of the neutral hydrogen clouds at large distances from the galactic center, could be in the form of a Bose- Einstein condensate. To study the condensate we use the non-relativistic Gross-Pitaevskii equation. By introducing the Madelung representation of the wave function, we formulate the dynamics of the system in terms of the continuity equation and of the hydrodynamic Euler equations. Hence dark matter can be described as a non-relativistic, Newtonian Bose-Einstein gravitational condensate gas, whose density and pressure are related by a barotropic equation of state. In the case of a condensate with quartic non-linearity, the equation of state is polytropic with index n=1. To test the validity of the model we fit the Newtonian tangential velocity equation of the model with a sample of rotation curves of low surface brightness and dwarf galaxies, respectively. We find a very good agreement between the theoretical rotation curves and the observational data for the low surface brightness galaxies. The deflection of photons passing through the dark matter halos is also analyzed, andthe bending angle of light is computed. The bending angle obtained for the Bose-Einstein condensate is larger than that predicted by standard general relativistic and dark matter models. Therefore the study of the light deflection by galaxies and the gravitational lensing could discriminate between the Bose-Einstein condensate dark matter model and other dark matter models.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 3
Some Recent Developments in Statistical Mechanical Description of Galaxy Clustering
Author: Manzoor Ahmad Malik1
1 Department of Physics, faculty of Physical and Material Sciences, University of Kashmir, Srinagar 190006, India
Corresponding Author: [email protected]
Cluster expansion method of statistical mechanics has proved to be a useful tool in describing gravi- tational galaxy clustering as a cosmological many body problem. The method yields a spatial galaxy distribution function, a generalized Poisson, in excellent agreement with observations and N-body simulation results. Some recent developments include distribution function for a multi component system, galaxy clustering as a phase transition, a rigorous derivation of the clustering parameter, distribution function for the system of galaxies for any ratio of gravitational potential to kinetic en- ergies, studies on the critical phenomena in the cosmological many-body problem, derivation of the fundamental form of two point correlation function etc. This paper elucidates these recent develop- ments and their implication for cosmology.
Page 8 Siam Physics Congress 2015 / Book of Abstracts
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 67
Particle’s Trajectory Around Static and Spherically Symmetric black hole in Massive Gravity Theory
Author: Supakorn Saelue1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
We attempt to explain the trajectory of a particle around the massive object using an effectivegrav- itational potential obtained from dRGT massive gravity theory. The dRGT massive gravity is the modification of the Einstein’s general relativity (GR) by considering theory with a massive graviton, while in GR the graviton is massless. We start with finding the static and spherically symmetric black hole solutions of the modified Einstein equations in empty space. We found that at small scale, the solution recovers Einstein’s gravity with small correction contributed from graviton mass. At large scale, the dominant contribution provides the accelerating expansion of the universe since the graviton mass serves as cosmological constant. The corrections in the solution may provide an opportunity to distinguish the particle motion between massive gravity and GR.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 118
Overcoming the Seeing Limitations at 2.4-m Thai National Tele- scope with Lucky Imaging Technique
Author: Rattanawadee Tekavong1
Co-authors: Christopher Go 2; Glenn Orton 3; Saran Posayajinda 2; Wiphu Rujopakarn 4
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand 10140 2 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand 3 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA 4 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand
Corresponding Author: [email protected]
Resolving power of large telescopes is limited by seeing condition, the blurring due to the Earth’s atmospheric turbulence. This limits the capability of large telescopes, including the 2.4-m diameter Thai National Observatory (TNO) in Chiang Mai, Thailand, from reaching its fullest resolving power. We present an effort to overcome this limitation through the ‘Lucky Imaging’ technique, whichis done by taking large number of short (e.g., 0.01 second) exposures to “freeze” the atmospheric tur- bulence, and select the least atmospherically distorted images to combine into a final image with high signal-to-noise ratio. We obtain R-band images of Messier 15 and 79 (M15 and M79) from the TNO during December 2014. The objects are chosen to represent high-density star field suitable for determining the resolving power of the final image. We took 240 and 502 images of M15 and M79, respectively, and selected 1% of images with best quality to combine into final images. We measured the full width at half maximum flux (FWHM) of the final star images and found that we canobtain FWHM as low as 1.17 and 1.25 arcsec, for M15 and M79, respectively. This represents a ~20% im- provement to the resolution from the original 1.66 and 1.48 arcsec FWHM for M15 and M79, despite the average seeing conditions and moderate airmass of 1.2 - 1.8. This experiment suggests that the TNO is capable of high-resolution imaging of relatively faint objects such as star clusters through lucky imaging technique if data is acquired at the best seeing and highest elevation possible.
Page 9 Siam Physics Congress 2015 / Book of Abstracts
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 113
Observations and Monte Carlo Simulation of the Princess Sirind- horn Neutron Monitor at a Vertical Cutoff Rigidity of 16.8 GV
Author: Pierre-Simon Mangeard1
Co-authors: Alejandro Sáiz 2; David Ruffolo 2; Tanin Nutaro 3
1 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand 2 Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 Thailand 3 Department of Physics, Faculty of Science, Ubon Ratchathani University, Warin Chamrap, Ubon Ratchathani 34190, Thailand
Corresponding Author: [email protected]
Neutron monitors (NMs) are large ground-based instruments for precise time tracking of the varia- tions in the Galactic cosmic ray (GCR) flux at GeV-range. NMs are counting the secondary particles (mostly neutrons) issued from the interaction of the cosmic rays in the atmosphere. The sensitivity to GCR variations depends on the geomagnetic cutoff at the location of measurement. Since late 2007, the Princess Sirindhorn Neutron Monitor (PSNM), at the summit of Doi Inthanon, Thailand’s highest mountain (2565 m altitude), records the flux of galactic cosmic rays with the world’s highest vertical cutoff rigidity for a fixed station, 16.8 GV. We have developed Monte Carlo simulations of cosmic ray interactions in the atmosphere and in PSNM, and trace cosmic ray trajectories through Earth’s magnetic field to model the cosmic ray suppression at low rigidity at the location ofPSNM. The simulation shows a fairly good agreement with the data and the variations of the GCR spectrum, such as the solar modulation, can be investigated for the first time with a fixed NM at high rigidity. That expands the range in energy of the worldwide NM network’s sensitivity.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 157
Lumpy Cosmic Strings
Author: Matthew Lake1
1 The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000, Thailand
Corresponding Author: [email protected]
We outline a model of abelian-Higgs strings with variable scalar and vector core radii. In general, the functions determining the time and position-dependent core widths may be expressed as arbitrary left or right movers, of which the usual constant values are a particular solu- tion. In this case the string may carry momentum, even if the embedding of its central axis remains fixed, and the resulting objects resemble “necklaces”. Some possible astrophysical applications, such as lumpy strings as engines for anomalous gamma ray bursts, are also discussed.
Astronomy, Astrophysics and Cosmology (Sponsored by NARIT) / 70
Influence of Magnetospheric Plasma on Aurora at Magnetic Foot- prints of Io
Author: Tatphicha Promfu1
Co-authors: John Clarke 2; Jonathan Nichols 3; Suwicha Wannawichian 1; Utane Sawangwit 4
Page 10 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 Center for Space Physics, Boston University, Boston, MA 02215, USA 3 Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK 4 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Io magnetic footprint (IFP) is a result of interaction between Jovain magnetosphere and Io. Due to Jupiter’s fast rotation in comparison with Io, magnetospheric plasmas collide with atmospheric particles of Io at high speeds. Therefore the interaction region expands into an extended area behind Io. As a result, aurora spot is extended into a tail-like structure. This research study factors that affect variability of interaction between Jupiter’s magnetosphere and Io, which causes the variation of magnetic footprint’s brightness for different positions of the Io in Jupiter’s magnetosphere. Io’s position is indicated by System III longitude. Observations of Io magnetic footprints in this study had been conducted via the Space Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) instruments along with the Hubble Space Telescope (HST). We compare the magnetic footprint’s brightness from observed data with fitted data since 1999 to 2007. This study found that the brightness is controlled by several factors such as the variation of plasma density in the vicinity of Io, the magnetic field asymmetry, including the duration of volcanic eruption onIo.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 324
Rashba Effect from Schwinger’s Oscillator Model
Author: Hariphan Philathong1 Co-authors: Narupon Chattrapiban 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Synthetic magnetic field is recently demonstrated theoretically and experimentally in an ensemble of neutral atoms through Rashba effect. In this presentation, Schwinger’s oscillator model isused to demonstrate the Rashba effect in favor of traditional angular momentum bases. The Schwinger’s model is useful in setting up the master equation of atoms interacting with field both in freespace and cavity to reflect the synthetic field.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 162
Single Rubidium-85 Atom in a Far Off-resonance Dipole Trap
Author: Nuttanan Tanasanchai1 Co-authors: Rattakorn Kaewuam 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Authors: [email protected], [email protected]
We have trapped a laser-cooled single rubidium-85 atom in an optical dipole trap using sub-Poissonian loading scheme. The trap beam with 4mK depth was produced with 830nm focused laser beam.Our optical circuits based on the two-beam trap and homemade equipments are described. The photo- graph of a single rubidium-85 atom taken for the first time in Thailand is presented.
Page 11 Siam Physics Congress 2015 / Book of Abstracts
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 297
Quantum Algorithm for Finding Roots of nth Degree Polynomi- als
Author: Theerapat Tansuwannont1
Co-authors: Pruet Kalasuwan 2; Surachate Limkumnerd 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand 2 Department of Physics, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkla 90112, Thailand
Corresponding Author: [email protected]
Quantum algorithm is an algorithm for solving mathematical problems using quantum systems en- coded as information, which is found to outperform classical algorithms. The objective of this study is to develop a quantum algorithm for finding the roots of nth degree polynomials where n is any positive integer. In classical algorithm, the resources required for solving this problem increase drastically when n increases and it would be impossible to practically solve the problem when n is large. It was found that any polynomial can be rearranged into a corresponding companion matrix, whose eigenvalues are roots of the polynomial. This leads to a possibility to perform a quantum al- gorithm where the number of computational resources increases as a polynomial of n. In this study, we construct a quantum circuit representing the companion matrix and use eigenvalue estimation technique to find roots of polynomial. The complexity of this quantum algorithm is also compared with a classical algorithm for solving the same problem.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 146
Four Level Dynamic in Rubidium-85 Magneto-Opical Trap
Author: Rattakorn Kaewuam1
Co-authors: Narupon Chattrapiban 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Authors: [email protected], [email protected]
We use the density matrix formulation to study the dynamic of atom-photon interaction of Rb-85 atoms under the cooling and repumping laser fields in a magneto-optical trap (MOT). The sponta- neous emission process is taken into account using the fully-quantized theory. The obtained master 2 equations are numerically solved for the four-level system including two levels of 5 S1/2F = 2, 3 2 and two levels of 5 P3/2F = 3, 4. The steady solution that naturally gives the probability of finding trapped atoms occupying each level in MOT is analyzed in detail.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 155
Concentric-Ring Atom Interferometer
Author: Kritsana Srakowl1
Co-authors: Narupon Chattrapiban 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Page 12 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
We investigate applicability of a novel atom interferometer consisting of two concentric rings for pre- cision measurements. The investigation is carried out with a computer simulation of Gross-Pitaevskii equations which monitors low energy vibrational modes inside of the interferometer under various ring geometries. From each eigenmodes, the fringe visibility between thermal ensemble and degen- erate Bose gas are compared.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 156
Split-Operator Method for Fabry-Perot Interferometry
Author: Jindaratsamee Phrompao1 Co-authors: Narupon Chattrapiban 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
We numerically calculate transmission, reflection and cavity-modes inside a Fabry-Perot interfer- ometer using the split-operator method. Unlike traditional methods, the cavity’s eigenmodes are computed from temporal propagation instead of spatial propagation which makes the calculation of cavity scanning more practical. Also the split-operator coexist with master equations of fully quantum mechanics calculation of atom-photon interaction in the Fabry-Perot cavity.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 263
The study of Cavity Quantum Electrodynamics as a heralded quan- tum memory
Author: Apichayaporn Ratkata1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
We consider the efficient creation of heralded dicke states in an atomic ensemble trapped inahigh finesse optical cavity. Weak resonant light in free-space mode transverse to the cavity is efficiently absorbed by the optically dense sample. Subsequent stimulated Raman scattering into the cavity mode dominates over free space scattering because of the high single atom cooperativity of the cavity. We discuss experimental progress towards realizing heralded atom-photon interfacing.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 170
Adiabatic Interaction between Rydberg Atom and Ground-State Atom
Author: Rattakorn Kaewuam1 Co-authors: Narupon Chattrapiban 1; Waranont Anukool 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Page 13 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
The adiabatic interaction between Rydberg atom and ground-state atom of Rb2 was numerically investigated. The semi-molecular potentials were calculated by matching the wave function ofRyd- berg electron using Kirchhoff integral with Coulomb Green’s function that corporates the quantum defect correction. The interaction potential was employed to pinpoint the principle quantum num- ber of particular rubidium-85 Rydberg atom that demonstrates crucial structure demanded by our novel Rydberg-assisted single-atom trapping scheme.
Atomic Physics, Quantum Physics, Molecular and Chemical Physics / 88
Phase structure and microstructure of CaZrO3 powder prepared by molten salt method
Author: Wasuporn Hirunsit1 Co-author: Sukum Eitssayeam 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Lead-free calcium zirconate (CaZrO3) is an important raw material for industry applications because of its excellent thermal and electrical properties such as, high dielectric constant and low dielectric loss [1]. However, in order to achieve pure CaZrO3 powder, high calcining temperatures ( 1300 ◦C) and long dwelling times for solid reactions between the CaCO3 and ZrO2 powders are required [2]. It is well known that the molten-salt method can synthesize powders at lower temperatures and is a simple technique. Thus, this work is to investigate the preparation of lead-free CaZrO3 powder by the molten salt method. The starting powders of CaZrO3 were weighed, mixed and ball-milled. After that, they were mixed with KCl:NaCl salt in the ratio of 1:1. Then calcined at temperatures of 900-1050 ◦C and washed with hot-distilled water. Phase formation and microstructure of CaZrO3 powders were studied by using an X-ray diffractometer (XRD) and scanning electron microscope (SEM). The phase structure of the powder corresponded to CaZrO3 peaks (JCPDS No. 035-0590). Moreover, uniform particle size, agglomerated particles and equiaxed grains of CaZrO3 powders were observed.
Biological Physics and Biomedical Engineering (Sponsored by MTEC) / 284
The Synthesization of biocomposite materials of Hydroxyapatite/beta- tricalcium phosphate/biopolymer scaffold for bone tissue regen- eration
Author: Chawit Chaijirawiwat1 Co-authors: Metha Trikasemmart 1; Pornchai Kopatta 1; Tanasate Naphathrathorn 1
1 Department of Physics, Mahidol Wittayanusorn School, Thailand
Corresponding Authors: [email protected], [email protected], [email protected]
Loss and damage of bone tissue is the one of the most troubling problems that jeopardize human health. Therefore, over the past decade, synthesization biocomposite materials for bone tissue en- gineering is becoming increasingly interested. In this study, Bio-composite material composed of hydroxyapatite/beta-tricalcium phosphate (BCP) (inorganic) and chitosan/alginate (ChiAlg) (or- ganic) (BCP@ChiAlg) with the three different ratios of 1:1, 2:1 and 3:2 wt/wt (chitosan/alginate) were synthesized. The mechanical properties and the in vitro growth of rat osteoblast-like UMR-106 cells were investigated. The results indicate that the mechanical strength and bioactivity are controlled
Page 14 Siam Physics Congress 2015 / Book of Abstracts
by the chitosan and alginate ratio. The obtained result from this study shows the composition of3:2 by wt ratio is the most effective ratio with the compressive strength of 6.31 MPa. It was obtained the significant increase in cell availability and high cell activity. These characterizations revealthata composite of BCP@ChiAlg is one of interested biocomposite materials for application in bone tissue engineering.
Biological Physics and Biomedical Engineering (Sponsored by MTEC) / 361
Hydroxyapatite and Ceramic Composite Coatings by Novel Plasma Spraying Technology for Bio-Medical Implant Application
Author: Akira Kobayashi1
1 MJIIT, University of Technology Malaysia KL, Jalan Semarak 54100, Malaysia; Graduate School of Engineering, Osaka University, Osaka 565 0871, JAPAN
Corresponding Author: [email protected]
Hydroxyapatite (HA) coated implants have promising bioactive properties and biocompatibility of HA with bone in orthopedic and dental surgery. The advantages of HA coating on implants is those, such as a more rapid and stable fixation of the implant to the bone, stronger bonding between the bone and the implant, increased uniform bone in growth at the bone implant interface and decreased release of metal ions from the implant to the body, etc. The plasma sprayed HA coatings generally contain cracks, pores, second phases, and residual stresses. Those affect the in-vivo performance of HA coatings due to both composition and crystallinity. Therefore, the control of the micro-structure of the HA coatings is the main target to develop the high performance implants for bio-medical applications. The gas tunnel type plasma spraying developed by the author is a novel plasma technology, which has properties such as high thermal efficiency of 80%, high temperature and high energy density, relatively high deposition rate, prevention of in-flight decomposition, minimized oxidation due to higher amount of working gas, and so on. Therefore, the gas tunnel type plasma spraying enables to obtain not only high quality ceramic coatings, but also HA coatings in a short spraying time. By observation of SEM micrographs of HA coatings sprayed at different arc current, the pores appeared in the HA coating sprayed at low arc current, and HA coating became high dense with few pores at high arc current. This means the good controllability of the microstructures of HA coatings by this novel plasma spraying method. Crystalline HA coating was achieved through gas tunnel type plasma spraying under optimum spraying conditions. Furthermore the gas tunnel type plasma spraying method was successfully employed to produce HA and YSZ reinforced HA coatings on 316L stainless steel substrate. The reinforcement of YSZ in HA significantly reduced the porosity and consequently increased the coating hardness and enhance the adhesive strength. The potentiodynamic polarization and impedance measurements showed that YSZ reinforced HA coatings have superior corrosion resistance compared to the pure HA coating in SBF solution. The cell culture results revealed that the reinforced YSZ coating has improved the bioactivity of the HA coatings. As another method to enhance the HA coating performance, lan- thanum oxide (La2O3) was mixed with Hydroxyapatite (HA) powder. The addition of La2O3 in HA significantly reduced the porosity and consequently increased the coating hardness and enhanced the adhesive strength and wear resistance.
Biological Physics and Biomedical Engineering (Sponsored by MTEC) / 350
Determination of Unconjugated Estriol by Using Surface Plasmon Resonance (SPR) Biosensor
Authors: Kitti Boonperm1; Toemsak Srikhirin2
Page 15 Siam Physics Congress 2015 / Book of Abstracts
Co-authors: Apirom Wongsakulyanon 3; Boonsong Sutapun 4; Nongluck Houngkamhang 1; Thidarat Wangkam 5; Verayuth Praphanphoj 6
1 Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand 2 Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand 3 Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol Unversity, Bangkok, 10400, Thailand 4 School of Electronic Engineering and School of Telecommunications Engineering, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand 5 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s Univer- sity of Technology North Bangkok, Bangkok, 10800, Thailand 6 Center for Medical Genetics Research, Rajanukul Institute, Bangkok, 10400, Thailand
Corresponding Author: [email protected]
Unconjugated estriol (uE3) is one of the estrogen hormone produced in significant amount during the pregnancy. It can be measured in maternal blood and its level can be used as a marker for screening the down syndrome. An abnormally low level of uE3 indicates a chance of baby suffering from a down syndrome, lower than 0.68 ng/mL in the second trimester. The main objective of this work is to develop the technique for maternal serum screening for uE3 by using surface plasmon resonance (SPR) technique. uE3 is a small molecule and it is very difficult to detect directly by SPR; therefore, the inhibition assay was chosen for the study. The inhibition assay was done by mixing uE3 sample with known amount of the antibodies. The free antibodies bind with the uE3 in the premixed sample causing the reduction of the free antibodies. Therefore the higher the uE3 presented in the sample, the lower the free antibodies in the mixed sample. The amount of the uE3 was quantified against the standard curve. The possibility of regenerating the sensor chip up to 3 cycles were achieved.
Biological Physics and Biomedical Engineering (Sponsored by MTEC) / 279
Free human Chorionic Gonadotropin beta (hCGβ) detection of The Triple Test for Down’s syndrome screening in maternal serum using Surface Plasmon Resonance Technique (SPR)
Author: Phatra Khomkrachang1 Co-authors: Apirom Wongsakulyanonta 2; Boonsong Sutapun 3; Nongluck Houngkamhang 4; Thidarat Wangkam 5; Toemsak Srikhirin 6; Verayuth Praphanphoj 7
1 Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok, THAILAND, 10400 2 Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol Unversity, Bangkok, THAILAND 10400 3 School of Electronic Engineering and School of Telecommunications Engineering, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000 4 College of nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand 5 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s Univer- sity of Technology North Bangkok, Bangkok, THAILAND 10800 6 Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400 7 Center for Medical Genetics Research, Rajanukul Institute, Dindaeng Rd., Bangkok, THAILAND 10400
Corresponding Author: [email protected]
It is well-known that the principle of surface plasmon resonance (SPR) based sensing is based on the detection of a small refractive index change on a thin metal film caused by complex formation between biomolecules such as antigen–antibody complexes. Therefore, the SPR-based immunoas- say has often been employed to extend its application to the clinical diagnosis for the detection of biomarkers in low concentration in human blood with accurate and rapid results. In this study, SPR technique was used to detect free human Chorionic Gonadotropin beta (hCGβ) level in pregnancy
Page 16 Siam Physics Congress 2015 / Book of Abstracts
serum that is one of the major markers for Down’s syndrome screening. The detection limit that should be detected for Down’s syndrome is at the nanogram level that it is necessary for clinical diagnosis. The platform as sandwich immunoassay used three types of antibody, monoclonal anti hCGβ antibody as primary antibody, polyclonal anti hCGβ antibody as secondary antibody and gold nanoparticles conjugated polyclonal anti IgG as third antibody for signal enhancement. Those anti- bodies were performed on a carboxymethyl dextran sensor chip. An optimum condition of antibody immobilization on dextran surface was obtained by using antibody with concentration of 20 μg/mL prepared in an acetate buffer solution at pH 4. Under the above condition, relatively high intensity of SPR signal was achieved in comparison to those obtained at other pH (3, 5 and 6). This SPR based sensor showed that the detection limit was at 30 ng/mL of concentration. Moreover, the hCGβ de- tection in maternal serum samples without non-specific absorption of other proteins in matrix was succeeded at 1/50 dilution. References: J. Homola, Present and future of surface plasmon resonance biosensors, 2003, 377, 528–539.
Condensed Matter Physics / 168
Revealing an unusual transparent phase of superhard iron tetra- boride under high pressure
Author: Komsilp Kotmool1 Co-authors: Gou HUIYANG 2; Ho-kwang MAO 2; Jonas ANVERSA 3; Luo WEI 4; Paulo Cesar PIQUINI 3; Rajeev AHUJA 5; Sudip CHAKRABORTY 6; Tae-won KANG 7; Thanayut KAEWMARAYA 5; Thiti BOVORNRATANARAKS 8
1 Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom, Thailand 73170; Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330 2 Geophysical Laboratory, Carnegie Institution for Science, Washington, DC 20015 3 Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil 97105-900 4 Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University, Uppsal, Sweden S-75120 5 Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University, Uppsala, SwedenS- 75120 6 Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University, Uppsala, SwedenS- 75120 7 Quantum Functional Semiconductor Research Center, Dongguk University, Chung gu, Seoul, Korea 100-715 8 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 10330
Corresponding Author: [email protected]
First principles–based electronic structure calculations of superhard iron tetraboride (FeB4) under high pressure have been undertaken in this study. Starting with a “conventional” superconducting phase of this material under high pressure leads to an unexpected phase transition toward a semicon- ducting one. This transition occurred at 53.7 GPa, and this pressure acts as a demarcation between two distinct crystal symmetries, metallic orthorhombic and semiconducting tetragonal phases, with Pnnm and I41/acd space groups, respectively. In this work, the electron–phonon coupling-derived superconducting Tc has been determined up to 60 GPa and along with optical band gap variation with increasing pressure up to 300 GPa. The dynamic stability has been confirmed by phonon dis- persion calculations throughout this study.
Condensed Matter Physics / 166
Cathodoluminescence study of electric-field induced migration of defects in single crystal ZnO
Page 17 Siam Physics Congress 2015 / Book of Abstracts
Author: Jedsada Manyam1
Co-authors: Coung Ton-That 2; Liangchen Zhu 2; Mark Lockrey 2; Matthew Phillips 2
1 NANOTEC, National Science and Technology Development Agency, Pathumthani, THAILAND 12120 2 School of Physics and Advanced Materials, University of Technology, Sydney, AUSTRALIA, NSW 2007
Corresponding Author: [email protected]
Point defects in ZnO play importance roles in chemical, optical and electrical properties of the mate- rial. Capability of manipulating the defects could lead to material engineering and benefit the field of ZnO based sensor, catalyst and optoelectronics. Here we examined redistribution of charge point defects in hydrothermally grown ZnO single crystal under the influence of external electric field at elevated temperature. Direct current (DC) electric field was applied to the device sandwiched be- tween two parallel plate shaped electrodes with dielectric spacers. Near band edge (NBE) and deep level transitions in ZnO samples were measured using a scanning electron microscope equipped with a cathodoluminescence spectrometer. Green emission band with peak position of about 2.4 eV and yellow emission band with peak position of about 2.0 eV were observed. The most intense green emission was found on the surface of the ZnO sample closed to a negative electrode, whilst that of yellow emission were comparable among all samples. Difference in emission spectrum could contribute to varying density of charge-associated luminescent centres along the direction of elec- tric field. Substitution of lithium, LiZn, has been known to be a neutral acceptor responsible for yellow luminescence in a hydrothermal grown ZnO which could not be influenced by the external field. Suppression of green emission after hydrogen plasma treatment suggests that the responsible luminescence centres could be a donor acceptor pair transition of zinc vacancy, VZn2-, anion and a shallow donor. Analysis of near band edge emission which provide information on types of shallow donor presented in the device will be discussed.
Condensed Matter Physics / 131
Stability Diagrams of Single-Electron Transistors
Author: Titipong Phoopathong1
Co-authors: Pramote Rungsri 1; Prathan Srivilai 1; Supachai Ritjareonwattu 1
1 Theoretical Condensed Matter Physics Research Unit, Department of Physics, Faculty of Science, Mahasarakham University, THAILAND 44150
Corresponding Author: [email protected]
Stability diagrams are a powerful tool for both analysis and design of single electron devices. These diagrams generally show stable regions and also state-transition lines. This tool has become useful for the investigation on the tunneling process within the devices. In this work, the procedure to build a stability diagram of the single electron transistor has therefore presented. The fundamental concept of the electrostatic potential was employed in the mathematical modelling of the electron-tunneling process between the electrode and the quantum dot (island). With a single isolated metal island in the architecture,four linear equations were modeled based on the possible tunneling events in the single-electron transistor. By changing the number of the excess electrons in the island, the stability diagram of the single-electron transistor was plotted to display the transition borders between re- gions. This technique can be extensively applied to the study of other single-electron devices, such as single-electron pumps.
Condensed Matter Physics / 265
Computational study of carbon dioxide adsorption on single-walled carbon nanotubes.
Page 18 Siam Physics Congress 2015 / Book of Abstracts
Author: Kamonrat Kasornmala1
Co-author: Pornjuk Srepusharawoot 2
1 Materials Science and Nanotechnology Program, Faculty of science, Khon Kaen University, 40002 Khon Kaen, Thai- land 2 Department of Physics, Faculty of science, Khon Kaen University, 40002 Khon Kaen, Thailand; Integrated Nanotech- nology Research Center, Khon Kaen Unibersity, 40002 Khon Kaen, Thailand
Corresponding Author: [email protected]
This project deals with the calculation of adsorption energies of carbon dioxide adsorbed onsingle- walled carbon nanotube with three different radii, namely 1.35, 2.71 and 4.07 Å by using the Density Functional Theory. Our results revealed that carbon dioxide molecule prefers to bind onsingle- walled carbon nanotubes with the molecular axis parallel to carbon nanotubes surface. Moreover, the adsorption energy of carbon dioxide is inversely proportional to radius of the carbon nanotube. We also found that the distance between center of mass of carbon dioxide molecule and carbon nanotube does not affect to the adsorption energy of carbon dioxide molecule. For charge analysis ofcarbon dioxide molecule, we found that carbon atom loses two electrons to each oxygen. Consequently, the charge states of carbon and oxygen atoms are +4e and -2e, respectively. Based on the O-C- O angle measurements, we found that the distortion of the carbon dioxide molecule is increased when the radius of carbon nanotube is decreased. This leads to the fact that the reduction of carbon dioxide adsorption energies when the radius of the carbon nanotube is gained comes mainly from the distortion of the carbon dioxide molecule.
Condensed Matter Physics / 141
Ab initio calculations of structural phase transitions of XP com- pounds (X=La, Ce, Pr, and Nd) under high pressure
Author: Chirayu Sainamthip1
Co-authors: Komsilp Kotmool 2; Pornmongkol Jimlim 3; Thiti Bovornratanaraks 4
1 Mahidol Wittayanusorn School, Nakhon Pathom 73170, Thailand 2 Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom 73170 Thailand; Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand 3 Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom 73170, Thailand 4 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
Corresponding Author: [email protected]
Lanthanide-monophosphate materials have been used in many applications, such as scintillators for detecting radiation and inorganic fluorescent labels. In this work, high-pressure phase transitions of XP (X = La, Ce, Pr, and Nd) have been undertaken. Based on density functional theory (DFT), the energetic stability of XP materials were investigated to verify the most stable structures at pressure ranges. NaCl-type, CsCl-type, PbO-type, and P4/mmm which are based on related experimental results, were chosen to carry out in all XP materials. Using local density approximation (LDA), the results reveal that all compounds exhibit the NaCl-type structure at ambient pressure which is in good agreement with the experiments. LaP, CeP and NdP transform by the path of NaCl-type → PbO-type → CsCl-type structure. Moreover, CeP continuously undergoes the transformation to P4/mmm structure. In contrast, PrP passes P4/mmm phase before approaching PbO-type structure. Electronic density of states (DOS) and band structures were performed to clarify the phenomenon of high-pressure phase transitions of these compounds.
Condensed Matter Physics / 42
Page 19 Siam Physics Congress 2015 / Book of Abstracts
Hydrogen adsorption of Ti decorations in Mg-Metal Organic Framework- 74: A First-Principles Study
Author: Pitphichaya SUKSAENGRAT1
Co-author: Pornjuk SREPUSHARAWOOT 2
1 Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, THAILAND 40002; Integrated Nan- otechnology Research Center, Khon Kaen Unibersity, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Metal-Organic Frameworks show to be one of the most promising materials for hydrogen storage materials owing to containing lots of hydrogen trapping sites, tunable pore size and cheap to pro- duce. However, the hydrogen adsorption energy of these materials is very low. In the present work, we functionalized Ti on the surface of Mg-Metal Organic Framework-74 (Mg-MOF-74) in order to enhance the hydrogen binding energy. For Ti adsorption sites on the Mg-MOF74, seven adsorption sites were considered, and we found that Ti binding energy ranges from 0.5-2.9 eV. Moreover, we put 1-3 H2 on the most stable Ti decorated site of Mg-MOF-74. Our results revealed that the hydrogen adsorption energies range from 0.51 to 2.43 eV/H2. Lastly, the hydrogen uptake of Ti-functionalized Mg-MOF-74 was evaluated by means of Ab initio Molecular Dynamics simulations. We found that the hydrogen capacities of this structure are 1.81, 1.79, and 1.29 wt% at 77, 150, and 298 K, respec- tively.
Environmental Physics, Atmospheric Physics, Geophysics and Renewable Energy / 28
Theoretical Study of Charge Transport in Alternating Donor-Acceptor Complex Oligomers for Polymer Solar Cell Applications: Poly(3- hexylthiophene) Based Azole
Author: Areefen Rassamesard1
1 Division of Physics, Faculty of Science and Technology, Prince of Songkla Universtity, Pattani Campus, THAILAND 94000
Corresponding Author: [email protected]
In this research have been simulated geometrical structures, molecular orbital, charge transports and photophysics of complex alternating donor-acceptor oligomers using in photo-active layer of polymer solar cell applications. Poly(3-hexylthiophene) (P3HT) was selected as an electron donor, while different azole such as oxadiazole (OXD), triazole (TAZ) and thienothiadiazole (TD) were used as electron acceptors, resulting in donor-acceptor complex oligomers P3HT-OXD, P3HT-TAZ and P3HT-TD, respectively. The calculation was performed by using Gaussian 09W software package at density functional theory (DFT) level with B3LYP (Becke Three-parameters Lee–Yang–Parr) ex- change correlation functional and 6-31G(d) basis sets. Simulation results obtained that energy lev- els HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) from all isolated electron acceptor molecules (OXD, TAZ and TD) are lower than that of the iso- lated electron donor (P3HT) indicating that all acceptors can withdraw electrons from the donor molecule. However, analyzing geometrical structure results were revealed that P3HT-OXD and P3HT-TD monomers reveal planarized structure, while TAZ unit from P3HT-TAZ molecule shows twisted conformer. Analyzing of molecular orbitals from complex oligomers were found that at LUMO level, electron transported from the donor to the acceptor unit was found from all complex oligomers but less for P3HT-TAZ due to large torsional angle between donor and acceptor units. Intramolecular charge transfer can be verified by Mulliken population analysis (Mulliken charge) on the acceptor unit. We obtained that OXD provides strongest electron withdrawing than others and polymer of P3HT-OXD can absorb wavelength of light well at 420 nm which is closed to maxi- mum intensity range (around 550 nm) from solar spectrum compared to other (P3HT-TAZ = 371 nm, P3HT-TD = 3024 nm), indicating that OXD behaves as a good electron acceptor. We concluded that
Page 20 Siam Physics Congress 2015 / Book of Abstracts
OXD provides appropriate characteristics of an electron acceptor unit for complex donor-acceptor using for polymer solar cell application.
High-Energy and Particle Physics / 12
Theoretical constraints on additional higgs bosons
Author: Patipan Uttayarat1
Co-authors: Benjamin Grinstein 2; Christopher W. Murphy 2; David Pirtskhalava 3
1 Department of Physics, Faculty of Science, Srinakharinwirot University, Bangkok 10110, Thailand 2 Department of Physics, University of California, San Diego, La Jolla, CA 92093 USA 3 Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
Corresponding Author: [email protected]
We present a sum rule for Higgs fields in general representations under SU(2)L×U(1)Y that follows from the connection between the Higgs couplings and the mechanism that gives the electroweak bosons their masses, and at the same time restricts these couplings. Sum rules that follow from perturbative unitarity will require us to include singly and doubly charged Higgses in our analysis. We examine the consequences of these sum rules for Higgs phenomenology in both model independent and model specific ways.
High-Energy and Particle Physics / 271
Projections at 14 TeV for Dark Matter Searches in the monojet final state using the upgraded CMS Detector
Author: Apichayaporn Ratkata1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
The projections of limits for dark matter searches studying from the final states containing amono- jet and missing transverse energy at the upgraded LHC are discussed. DM-sample events are gener- ated using MadGraph. In addition, DELPHES simulations at 14 TeV are used to estimate signal and backgrounds to set the limits on DM nucleon cross sections. Additional simple projections using generator level analysis are also carried out to compare to the DELPHES analysis.
High-Energy and Particle Physics / 198
N=2 seven-dimensional SO(4) gauged supergravity from eleven dimensions
Author: Parinya Karndumri1
1 Department of Physics, Faculty of Science, Chulalongkorn University
Page 21 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
A consistent reduction ansatz of eleven-dimensional supergravity to N = 2 SO(4) seven-dimensional gauged supergravity is constructed. The resulting seven-dimensional theory admits a topological mass term for the three-form field and a maximally supersymmetric AdS7 critical point. This is in contrast to the gauged supergravity without topological mass admitting a half-supersymmetric domain wall vacuum. The AdS7 critical point corresponds to N = (1, 0) superconformal field the- ory in six dimensions according to the AdS/CFT correspondence. The reduction ansatz is obtained from a truncation of the consistent S4 reduction giving rise to the maximal N = 4 SO(5) gauged supergravity, so the consistency is guaranteed by the consistency of the S4 reduction.
High-Energy and Particle Physics / 290
Search for the standard model Higgs boson produced by vector- boson fusion and decaying to bottom quarks
Author: Gurpreet Singh1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand
Corresponding Author: [email protected]
A search for the standard model Higgs boson in the vector boson fusion production channel with − decay√ to bottom quarks is reported. A data sample comprising 19.8fb 1 of proton-proton collisions at s = 8 TeV collected during the 2012 running period has been analysed and 95% confidence level upper limits on the cross section are derived in the mass range from 115 to 135 GeV. For a Higgs boson mass of 125 GeV the expected limit is 2.6 times the predicted standard model cross section, +1.6 while the observed limit is 5.6. The excess corresponds to a fitted signal strength of2.8−1.4, relative to the expectation for the standard model Higgs boson.
High-Energy and Particle Physics / 47
Photon Generation in a One Dimensional Oscillating Cavity with a Uniform Magnetic Field
Author: Kittipong Aimsamer1 Co-authors: Ekapong Hirunsirisawat 2; Monsit Tanasittikosol 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand 10140 2 Office of Engineering Science Classroom, Learning Institute, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
Corresponding Author: [email protected]
The vacuum of quantum electromagnetic field can be excited in the form of photon creation viathe interaction with moving boundaries. This is so-called the dynamical Casimir effect. It is wellknown that the external magnetic field can result in the amplification of the quantum fluctuations ofelec- tromagnetic field. In the present work, we therefore consider photon creations from the dynamical Casimir effect in a one dimensional cavity between two parallel moving conducting plates withthe presence of a uniform external magnetic field. Starting with the Euler-Heisenberg effective action, the quantum electromagnetic field operator is written as the expansion of mode functions, whichare the classical solutions corresponding to the effective Lagrangian. By calculating Bogoliubov coeffi- cients, the number of created photons is determined in the resonance condition. With the presence of a uniform magnetic field, photons are generated with larger amount than that in the caseofno magnetic field.
Page 22 Siam Physics Congress 2015 / Book of Abstracts
High-Energy and Particle Physics / 46
Dynamical Casimir Effect in an Oscillatory Cylindrical Cavity on a Magnetized Background
Author: Ekapong Hirunsirisawat1
1 Office of Engineering Science Classroom, Learning Institute, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
Corresponding Author: [email protected]
It has been found that the external magnetic field can induce particle creations from vacuum fluctua- tions of quantum electromagnetic field. This indicates that the quantum fluctuations associated with one loop corrections can be amplified by an intense magnetic field. It is interesting to consider the particle creation process in the dynamical Casimir effect on a magnetized background. In this work, we apply the Euler-Heisenberg action, the effective action dominated by the one loop correction term, to deal with the quantum electromagnetic field in the cavity with non-stationary boundary condition. The number of created photons are determined in the process with an oscillating cylin- drical conducting wall, which is in a uniform magnetic field parallel to the wall. We also discuss the effect of the external magnetic field on particle creations in the dynamical Casmireffect.
High-Energy and Particle Physics / 276
Development of Charm quark Tagger at the CMS Detector
Author: Kittikul Kovitanggoon1
Co-author: Burin Asavapibhop 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand
Corresponding Author: [email protected]
Various final state channels at, the Compact Muon Solenoid (CMS), contain charm quark jets. Charm quarks can be hadronized to D mesons which could travel some distance in the tracker before de- caying, providing the displaced tracks and vertices. The CMS silicon tracker allows the precise reconstruction of such vertices and tracks that are displaced with respect to the primary interaction point. The identification of charm jets or “c tagging” algorithm is constructed based on thebtagging algorithms. Particle Physics Research Laboratory at Chulalongkorn University, as a part of the c tagging team, is currently studying the c tagging algorithm in order to maximize the performance. This study will be vital for both supersymmetry (SUSY) searches such asstop(t˜), the SUSY partner of standard model (SM) top, that may subsequently decay to a charm quark and the lightest super- symmetric particle (LSP) and for SM precision measurements in the new data taking at the Large Hardron Collider (LHC) in 2015.
Instrumentation, Metrology and Standards / 203
Influence of form deviation to diameter measurement of cylin- drical master
Author: Narin Chanthawong1
Co-authors: Jariya Buajarern 1; Yodying Moukngam 1
1 National Institute of Metrology (Thailand), Pathumthani, THAILAND 12120
Page 23 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Authors: [email protected], [email protected]
Cylindrical masters such as plug gauges and ring gauges are commonly used in manufacturing pro- cess as the physical diameter standard. Diameter of the cylinder is defined in the JIS B 7420 by means of distance between two opposite edges measured by the length measuring instrument. The standard method descried that length shall be measured two directions perpendicular each other in the cross section in multiple layers. And the diameter is calculated from the arithmetic mean be- tween all measured values. However, the mean diameter does not represent the diameter when it is used for working gauge inspection because form deviations have an effect to gage wear. This paper investigates the influence of form deviation of the cylindrical masters by using roundness tester, universal length measuring machine (ULM) and coordinate measuring machine (CMM). The results show the form deviation effect to the diameter of cylindrical masters and error should beincluded in uncertainty of measurement of mean diameter.
Instrumentation, Metrology and Standards / 60
Development of AC High Voltage Measurement System with Dig- ital Technique at NIMT
Author: Chatchaval KURUPAKORN1
Co-author: Danai PATTARAKIJKUL 1
1 Electrical Metrology Department, National Institute of Metrology (Thailand), Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
This paper describes how to develop, test and evaluation of an AC High Voltage Measurement System 70 kV with digital technique at NIMT. The purpose of the development is to make national standard more reliable for quality assurance. The AC HV Measurement System consists of a Capacitive-High Voltage divider, Measuring cable and high precision Digital Multi-Meter. Its nominal scale factor is 10000:1. A 100 pF compressed gas capacitor is series-connected with a 1 micro-F low voltage standard capacitor to form the Capacitive-High Voltage divider. The measuring cable conducts a voltage signal from low voltage standard capacitor to a high precision Digital Multi-Meter. The high precision Digital Multi-Meter operates in digitizing mode to sample a voltage signal. The homemade program is designed to control the high precision Digital Multi-Meter to sample a voltage signal at the sampling rate greater than Nyquist rate from an output of the Capacitive-High Voltage divider, and calculate the values of sampled signal. The high precision Digital Multi-Meter with program is verified by a traceable ac voltage source.The results show that the measured value agrees within 70 ppm. After that, the high precision Digital Multi-Meter with program is connected to the Capacitive-High Voltage divider via a measuring cable. The AC High Voltage Measurement System is evaluated according to IEC 60060 by a well-calibrated national standard. The result shows the agreement within 0.2 %.
Instrumentation, Metrology and Standards / 236
Development of microwave-infrared drying system for industrial prototype of STR20 production
Author: Mudtorlep Nisoa1
Co-author: Priwan Kerdtongmee 2
1 Division of Physics, School of Science, Walailak University, Nakhon Si Thammarat, THAILAND 80161 2 The center for scientific and technological equipments, Walaklak University, Nakhon Si Thammarat, THAILAND 80161
Page 24 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
Rubber block STR20 is a natural rubber product which has highest market need for both locally and internationally. STR20 is used as raw materials for various industries, such as tire, conveyor, elastomeric bearing pad and shockproof rubber case. Drying process is the most important in the rubber block production, which also consume the most of energy use. Typically, the dryers use hot air, supplied by the combustion of fuel oil or LPG, to remove the moisture from rubber granules, before compression for STR20 rubber block. Normally, the drying time is longer than 3 hours, since the heat transfer occurs slowly inside the rubber granule. There have to be temperature gradient between surface and inside of the granule for the heat transfer. Because of energy loss by ambient air and the dryer’s wall, hot air dryer has low energy efficiency. Development of new drying technology by using microwave will increase the energy efficiency, reduce the drying time and increase the quality of the rubber block. The microwave can heat the rubber granule uniformly, without energy loss to the air and the environment. In this research, we have developed drying system by using combined microwave-hot air process. The hot air will heat up the surface, while microwave will cause the high temperature inside, resulting as uniform heating of the granule. The drying time is shorter and the quality of the dried rubber is better. For the drying capacity, rubber bed-depth is greater than 30 cm, and drying rate is more than 30 kg/h. The drying technology has potential for development of industrial prototype of STR20 rubber block production in the future.
Instrumentation, Metrology and Standards / 65
Determination of Density According to Test Method A1 (Two Dif- ferent Reference Weights Weighed in Air) of OIML R111-1, 2004(E)
Author: Wirun Laopornpichayanuwat1
Co-authors: Monchai Mitaree 1; Rungsiya Sukhon 1
1 Mechanical Metrology Department, National Institute of Metrology (Thailand), Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
Density of standard weights is one of many parameters that have the influences on the mass deter- mination of the weights. As it is used to calculate the air buoyancy correction, which is an important factor to precisely determine the mass of the weights. According to the International Organization of Legal Metrology (OIML) recommendation R 111-1, 2004(E), there are six accepted methods for the determination of the density of standard weights. Those are methods A, B, C, D, E and F. For the first four method, the test weights are weighed in standard density liquids such as water. Method E determines volume and hence density by geometric measurement, while the density estimation of method F is based on known composition. Among these six methods, method A is the most ac- curate. Method A uses hydrostatic technique, which compares test weights with reference weights both in air and in liquid of known density. This method can be separated into three methods, which are A1, A2 and A3. However, only method A1 is mentioned in this work. The technique used in method A1 is that the test weight and the first reference weight are firstly compared in air. Then, the test weight in liquid is compared with the second reference weight in air. The test weights used in this work are weights class E having mass between 5 g and 100 g. These weights are manufactured by stainless steel. In this paper, the densities with expanded uncertainty (for k = 2) of these test weights are determined and reported. The uncertainties obtained are within specification ofOIML R111-1, which is between 1.5 kg.m−3 to 60 kg.m−3. The measured densities are compared with those obtained from the method accredited by the Accreditation Body of Deutsche Akkreditierungsstelle (DAkkS), ISO/IEC 17025, on the registration number D-K-15194-01-00. Results obtained from both methods are consistent as shown by En numbers. The absolute En numbers is not greater than 1.0, which is satisfied.
Instrumentation, Metrology and Standards / 57
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Preliminary Study for the Establishment of Oscillation-Type Den- sity Meter Calibration at NIMT
Author: Chompoonoot HIRUNYAPRUK1
Co-authors: Narongsak PLAINDITH 1; Rungsiya SUKHON 1
1 Mechanical Metrology Department, National Institute of Metrology (Thailand), Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
Density meters have been employed to measure the density of liquids and used in many areas such as chemical, petroleum, pharmaceutical and beverage applications. The advantages of density meters over other density measurement devices are their fast measurement, high accuracy and little sample needed. Although high accuracy is one of their major features, the density meters need regular cal- ibration to ensure the accuracy of their measurement results. National Institute of Metrology (Thai- land), NIMT, studied the calibration of density meters in accordance with the international standard ISO 15212-1. In this paper, the studied technique was applied to the calibration of oscillation-type density meters. The calibration performed at the temperature of 20 ℃ was traceable toSIunitby using traceable standard liquids with known densities. Three types of the liquids, whose densities are within the density measuring range of 700-1600 kg/m3, were employed. Those liquids were lube oil, water and sodium bromide in water. The calibration results were presented in terms of the devi- ations between the measured densities and the certified densities reported in certificates of standard liquids. Also the sources of measurement uncertainty were proposed and calculated. The calibration results showed acceptable deviations, which were within the maximum permissible errors of density meters under test.
Instrumentation, Metrology and Standards / 29
Controlling output signal of frequency generator for NMR
Author: Klitsadee Yubonmhat1
Co-author: Wiwat Youngdee 1
1 Department of Physics, Faculty of Science, Khon Kaen University, 40002, Thailand
Corresponding Author: [email protected]
NMR frequency generator was built using digital frequency generator (PTS310) and AVR microcon- troller. The microcontroller was programmed to receive a frequency value from computer. After processing, the microcontroller sent 24 parallel data bits to control the digital frequency genera- tor (PTS310). The frequency value is restricted between 0-16 MHz. It was found that the output frequency can be controlled from 0.00000 MHz to 9.70129 MHz. The error of output frequency is 0.20%.
Instrumentation, Metrology and Standards / 115
Using relative gravimeter to determine vertical gravity gradients at NIMT
Author: Tasanee PRIRUENROM1
Co-author: Nattanan WORADET 1
1 Pressure Laboratory, Mechanical Department, National Institute of Metrology (Thailand), Pathumthani, THAILAND 12120
Page 26 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
This work presents the method used to determine the vertical gravity gradients at National Institute of Metrology (Thailand), NIMT, using the relative gravimeter Scintrex Autograv CG-5. Thisvalue will be used to transfer the absolute gravity from the reference height of an instrument to a new specific position because the reference height of each absolute gravimeter is different dependingon its construction that can be found between about 80 and 130 cm. Thus, in the comparison between absolute gravimeters, the measurement results must be corrected from the reference height of their gravimeters to the same reference level. That is why, it is necessary to determine the vertical gravity gradients as high accuracy as it is possible. In this work, three locations were selected to perform measurements that are two points at NIMT-Klong 5 (Pathumthani) and one point at NIMT-Rama 6 (Bangkok). The vertical gradient at each location was determined from linear fitting usingthe relative gravity values measured by CG-5 at five vertical levels above the ground benchmark. The results of gravity gradients found in this work range from 300.4 µGal m−1 to 320.4 µGal m−1 (1 µGal = 10−8 m s−2) that the normal value of vertical gradient is 308.6 µGal m−1.
Instrumentation, Metrology and Standards / 363
Discover the New Reality for Your Analytical Electron Microscope
Author: Alex Wong1
1 Bruker Singapore Pte. Ltd., 11 Biopolis Way, #10-10, Singapore 138667
Corresponding Author: [email protected]
In this presentation, the latest 5-on-1 system for SEM will be introduced. The presentation will focus on the four channel SDD FlatQUAD EDS, XTrace micro-XRF and micro-CT systems, and briefly discuss on the new developments on EBSD and WDS. Quantax FlatQUAD is the EDS microanalysis system based on the revolutionary XFlash® FlatQUAD. This special annular four-channel silicon drift detector is inserted between SEM pole piece andsam- ple, achieving maximum solid angle (>1.1sr) and take off angle (>60o), allowing maximum input count rates (ICR) (up to 4,000,000 cps) and output count rate (OCT) (up to 1,600,000 cps) for low KV (3kV) and probe current (<10pA) EDS analysis. XTrace is a micro-spot X-ray source for attachment to SEM with a free inclined port on the specimen chamber. It adds the capabilities of a complete micro-XRF spectrometer to the microscope. Limits of detection are improved 20 to 50 times in the mid to heavy element range. Additionally, up to 1cm information depth become accessible as X-rays have a higher penetration power than electrons. With ESPRIT analytical software suite, a combined micro-XRF and EDS quantification provides re- liable light element results and pushes the limit of detection of medium to heavy elements down to 10 ppm, which offers the highest quality attainable by energy-dispersive analysis. Micro-CT for SEM adds true 3D microscopy to your SEM with visualization as three orthogonal sections or as slice-by-slice movie. It extends the surface information gained with conventional SEM imaging by allowing a unique insight into a specimen’s internal microstructure down to a size of 400nm non-destructively.
Instrumentation, Metrology and Standards / 181
Development of a shear-wave generator for shallow seismic in- vestigation
Author: Sawasdee YORDKAYHUN1 Co-authors: Jamrus NA SUWAN 1; Kamhaeng WATTANASEN 1
Page 27 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai, THAILAND 90112
Corresponding Author: [email protected]
Shear wave velocity is a fundamental parameter in determining geological structures and soil charac- teristics for geotechnical and earthquake engineering studies. Shear wave velocity can be obtained from the conventional surface seismic method such that the shear wave is generated by the seismic source and the refracted and reflected energies are recorded by the array of geophones. We report here on the design and development of an effective shear wave seismic source that will be alterna- tively used for shallow seismic survey. Structure of the developed source consists of 4 main parts, including base plate, activated mass, lifting and shooting system, body and transportation system. It is operated based on a simple mechanical system by lifting an activated mass with an attached sling and puller. When the mass reach the armed position and spring is under compression, the potential energy is stored. After the mass is released and horizontally hit the base plate, shear wave isgen- erated by the momentum and energy transfer into the ground. To evaluate the source performance, a comparison test of the conventional shear wave sources and the developed source was performed at a test site. Data were analyzed in both qualitative and quantitative manner by examining the physical properties and visualizing the raw data, comparison of energy, frequency content, signal penetration and repeatability. It was found that the developed source produces the higher energy and repeatability than the conventional source and allows for a reducing the man power requirement. Overall, our apparatus has potential application and is suitable for teaching, research and academic service purposes.
Ion and Plasma Physics / 343
New solitonic, periodic and chaotic behaviors of ion acoustic waves in a nonextensive electron-positron-ion plasma
Author: Prasanta Chatterjee1
1 Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan-731235, Birbhum, India
Corresponding Author: [email protected]
Solitonic, periodic and chaotic behaviors of ion acoustic waves in an unmagnetized plasma with q-nonextensive electrons and positrons are investigated applying the bifurcation theory of planar dynamical systems. Model equations are transformed to a planar dynamical system using a traveling wave transformation. Then by using the bifurcations of phase portraits of this planar dynamical system, we have established that our model has solitary wave solutions and periodic wave solutions. We have obtained new analytical solutions for solitary and periodic waves depending on the parameters. Considering an external periodic perturbation, chaotic behavior of ion acoustic waves has been presented. It is shown that the speed of the traveling wave (v) and other parameters play crucial roles in qualitative changes of the dynamical system and chaotic behavior of the system.
Ion and Plasma Physics / 364
Generation of ozone in Dielectric Barrier Discharge and Its Ap- plication for Water Treatment
Author: Deepak Prasad Subedi1
1 Department of Natural Sciences, School of Science, Kathmandu University, Dhulikhel, Nepal
Corresponding Author: [email protected]
Page 28 Siam Physics Congress 2015 / Book of Abstracts
A dielectric barrier discharge (DBD) type ozone generator was designed with oxygen /air as a feed gas. The discharge was generated by using high voltage power supply operating at line frequency (50Hz). The effect of gas flow rate and applied voltage on the concentration of the ozonewasin- vestigated. The flow rate was varied from 1 lit/min to 5 lit/ min for electrode area A=143.56cm2 and 107.67cm2 and two values of gap space between electrodes d= 1mm and 2 mm. The applied voltage was varied from (5- 18 kV) for the same gap space and electrode area. It was found that the concentration of ozone produced increases with increasing voltage, and decreases with increasing flow rate for fixed applied voltage. The ozone thus produced was used for the treatment ofwater. Various physical, chemical and micro-biological parameters were analyzed on the samples before and after the treatment by ozone. Our results indicated that ozone does not alter the physical prop- erties significantly, namely pH, conductivity and turbidity of water. However, the treatment leads to a remarkable reduction in the number of fecal coliform in the samples of water.
Ion and Plasma Physics / 292
Improvement of RD31 rice seed germination using DBD plasma treatment
Author: Tipwimol Traikool1
Co-authors: Manu Fuangfung 1; Nopporn Poolyarat 1; Nuankamol Amnuaysin 1; Supenya Chittapun 1; Thawatchai Onjun 2
1 Thammasat University 2 Sirindhorn International Institute of Technology
Corresponding Author: [email protected]
Effects of atmospheric plasma treatment on RD31 rice seed germination are studied. Theseedsare treated with 5 mW of plasma for 10 sec. It is found that plasma treatments have positive effects on seed germination and seeding growth at the early stage. The germination rate is found to improve by 25% compared to non-treated seeds. In addition, the better quality of sprouts is obtained. Itis found that after 15 days, the roots’ length and weight of treated seeds is increased by 10% and20%, respectively, compared to non-treated seeds. In addition, the trunks’ length and weight are increased by 15% and 20%, respectively.
Ion and Plasma Physics / 347
Development of cost effective plasma technology at university of Malaya
Author: Chiow San Wong1
Co-author: O.H. Chin 1
1 Plasma Technology Research Centre Physics Department, University of Malaya 50603 Kuala Lumpur, Malaysia
Corresponding Author: [email protected]
Recently, the development of atmospheric pressure non-thermal plasma has been the research in- terest of many research groups world wide. This is because it is now realized that there is aneed to develope cost effective plasma technology so that it can be more widely used in industry. The atmospheric pressure plasma devices being considered include the glow discharge and the dielectric barrier discharge. Besides reducing cost by working with atmospheric pressure, another cost factor is the power supply. Currently, RF or microwave sources are commonly used in industry to power the plasma system. For
Page 29 Siam Physics Congress 2015 / Book of Abstracts
the generation of non-thermal plasmas, it is suitable to use the 50 Hz household supply to power the glow discharge or the dielectric barrier discharge. A step-up transformer can be used to provide a discharge voltage higher than the 240 V peak voltage supply from the mains.
Ion and Plasma Physics / 242
Development of 3.3 kJ Small Plasma Focus for Medical Radioiso- topes Production: Preliminary results
Author: Arlee Tamman1 Co-authors: Boonchoat Paosawatyanyong 2; Mudtorlep Nisoa 1; Thawatchai Onjun 3
1 School of Science, Walailak University, Nakhon Si Thammarat 80161, THAILAND 2 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND 3 School of Manufacturing Systems and Mechanical Engineering, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani 12120, THAILAND
Corresponding Author: [email protected]
PET scan is a medical imaging device for effective cancer diagnosis. It use medical radioisotopes such as 18-F. Since 18-F has short half-life, on site production is inevitable. Normally, cyclotron is used in the big hospital to produce 18-F. Plasma focus, a much cheaper and compact system, is an alternative device for 18-F production. The plasma focus can generate energetic particles which have enough energy for nuclear reaction to generate radio-isotopes. The main part of plasma focus device is consist of vacuum chamber, coaxial electrode, high voltage capacitor, high voltage power supply, spark gap and trigger. The Lee model and current waveform of RLC circuit is used to design the3.3 kJ plasma focus. The cathode and anode radius are optimized to be 1.25 and 2.50 cm, respectively, where their length are the same as 22.50 cm. The model show that when maximum current of167 kA is pinched within 13.4 ns, plasma temperature is risen to be 4.08×106K. To verify the Lee model, electric current oscillation in RLC circuit is measured under short circuit, when inductance L, resistor R and capacitor C are 125 nH, 20 mΩ and 30 µF, respectively.
Ion and Plasma Physics / 357
Metal nanoparticles synthesis using atmospheric pressure micro discharge jet
Author: O.H. Chin1 Co-authors: Boon Hoong Ong 2; Nay Ming Huang 3; Y.L. Thong 1
1 Plasma Technology Research Centre, Physics Department, University of Malaya 50603 Kuala Lumpur, Malaysia 2 Nanotechnology and Catalyst Research Centre (NANOCAT), University of Malaya 50603 Kuala Lumpur, Malaysia 3 Low-Dimensional Materials Research Centre, Physics Department, University of Malaya 50603 Kuala Lumpur, Malaysia
Corresponding Author: [email protected]
Metal nanoparticles (NPs) due to their size and shape, have unique attributes that differ from their macrosized counterparts. These attributes contributed to an ever-growing list of applications, from medicine to electronics. The challenge is not only to create the nanoscale sizes but also tokeepthe metal NPs dispersed without agglomeration. Conventional methods to synthesize the NPs include the physical (e.g. evaporation-condensation, laser ablation) and chemical (via chemical reducing and capping agents) approaches. An alternative method is to use a specially configured atmospheric
Page 30 Siam Physics Congress 2015 / Book of Abstracts
pressure micro discharge jet to produce NPs without the addition of reducing and capping agents. In this case, the micro discharge jet is itself the reducing agent, hence, making it environmentally friendly. The synthesis process is quite rapid (within minutes) and no heating is required.
Material Physics, Nanoscale Physics and Nanotechnology / 293
High-Quality Pure Cubic GaN on Patterned GaAs (001) Substrates with [110]-Oriented Stripes by MOVPE
Author: Pattana Suwanyangyaun1
Co-authors: Kentaro Onabe 2; Sakuntam Sanorpim 3
1 Nanoscience and Technology, Graduate School, Chulalongkorn University, Bangkok, THAILAND 10330 2 Department of Advanced Materials Science, The University of Tokyo 3 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
It is known that the cubic GaN (c-GaN) structure using epitaxial lateral overgrowth (ELO) could be controlled by mask fill factor (ratio of the open width to the pattern period), mask direction,and growth temperature. Particularly, ELO GaN on the [110] oriented stripe-patterned GaAs (001) ex- hibits hexagonal phase structure. On the other hand, in this work, we have proposed the use of the [110] oriented mask stripe-patterned SiNx/GaAs (001) with an optimized mask fill factor of 0.8 asa substrate for the metalorganic vapor phase epitaxy (MOVPE) growth of ELO c-GaN to realize a layer with high cubic-phase purity. Our results demonstrate that ELO c-GaN with high cubic-phase pu- rity was successfully performed on the window stripes opening along the [110] direction at growth temperature 900 ◦C. Consequently, a trapezoidal shape with (001) top surface and (111)B sidewall facets, which is a characteristic of cubic structure, was clearly observed the c-GaN stripes. XRD measurements showed that the full-width at half-maximum of c-GaN (002) rocking curve was deter- mined as the narrowest as 14.9 arcmin, indicating to a high crystalline quality of ELO c-GaN. The integrated volume amount of hexagonal phase inclusion, which was examined by XRD reciprocal space mapping, was decreased from 30.5% to 16.8% with increasing thicknesses from 1.4 µm to 12.0 µm, respectively. On the basis of our results, the hexagonal phase generation can be suppressed by controlling the growth feature, which is sensitive to mask fill factor and growth temperature.
Material Physics, Nanoscale Physics and Nanotechnology / 287
Controlling the thickness of silicon dioxide shell of iron boride nanoparticles
Authors: Satreerat K. Hodak1; Tipnirin Vajanarat1
Co-author: Jose Hodak 2
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330 2 INQUIMAE-Departamento de Química Inorgánica, Analítica y Química Físca, Facultad de Ciencias Exactas, Univer- sity of Buenos Aires, Argentina
Corresponding Author: [email protected]
Iron boride nanoparticles are one of soft ferromagnetic materials which also contain boron. These properties combined the possibility of magnetically targeting the nanoparticles, use their hysteresis loop to cause thermal damage of tissue, as well as provide boron neutron activation medicine in cancer therapy applications. Unfortunately, iron boride may be easily oxidized under oxygen rich atmospheres. Thus, they must be coated with protecting layers such as silicon dioxide. Inthis
Page 31 Siam Physics Congress 2015 / Book of Abstracts
project, we synthesized iron boride-silicon dioxide and enlarged the silica shell thickness by varying the concentration of the silica forming precursor tetraethyl orthosilicate (TEOS). The particle shape, and the silica shell thickness was then studied using transmission electron microscopy. The results showed that iron boride-silicon dioxide with spherical shape and well formed silica shell can be obtained with various thicknesses. After measurement, we got a mean size of the whole particle about 83 nm, the iron boride core size about 74 nm and the thickness of primary shell about 5 nm. The additional thickness of the silica shell was accomplished by further hydrolysis of TEOSusing −4 the primary Fe2B nanoparticles as seeds. The use of concentrations of TEOS of 3.16 x10 , 6.31 x 10−4 and 1.26 x 10−3 mol/l yielded 17 nm, 20 nm and 84 nm thick shell, respectively. We compared the experimental thickness of the silica shell with the expectation obtained from considering the amount of TEOS used and the initial particle size. In summary, silica shell thickness increased as the TEOS precursor concentration increased.
Material Physics, Nanoscale Physics and Nanotechnology / 83
Fabrication and Characteristic of BaTiO3 Based Ceramic by Molten Salt Synthesis
Author: Manlika Kamnoy1 Co-author: Sukum Eitssayeam 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
In this work, barium titanate; BaTiO3 (BT) powder was successfully synthesized by the molten-salt method. The molten-salt method is a simple technique for preparation of fine powder also cancontrol the shapes and sizes in the order of nanometers. The metal oxides of BaCO3 and TiO2 were mixed and ball-milled. After that, BT powder were mixed with KCl : NaCl salt and then washed withhot DI water. Heating temperatures were studied in the range of 800 to 1000 ◦C with using dwelling time of 2 hours. In order to investigate the microstructure and phase structure, they were studied by SEM and XRD techniques. The results found that all samples showed a single pure perovskite phase using a low temperature of ∼900 ◦C , which was confirmed by JCPDS No. 01-083-1879. The grain shapes of BT powder had a mixing of polygon and equiaxed grains. The particle size of BT powder increased from ∼381 to ∼860 nm with increasing heating temperatures from 800 to 1000 ◦C. Results confirmed that BT nanoparticles were obtained by using the molten salt method.
Material Physics, Nanoscale Physics and Nanotechnology / 127
Mie Scattering by Small Sphere Particles
Author: Irada Theppabut1 Co-authors: Apiwat Wisitsorasak 1; Monsit Tanasittikosol 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140
Corresponding Author: [email protected]
The objective of the research was to study how the size of the spherical particles and thewavelength of the incident electromagnetic waves affect the intensity of the scattered electromagnetic waves. We began the calculation by solving the Helmholtz equation to obtain the scalar wave equation which led to the scattered wave by the spheres. In the limit of far-field region, the radial component of the scattered wave may be neglected and the intensity of the wave can be represented intermsof a dielectric constant of a medium, the incident light wavelength and angles. Then the future work
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will be comparing the theoretical results with the experimental data of light scattering in silver nanoparticles.
Material Physics, Nanoscale Physics and Nanotechnology / 208
Chemical Vapor Deposition (CVD) Synthesis of Graphite Encap- sulated Magnetite Nanoparticles for Counter Electrode of Dye- sensitized Solar Cells
Author: Sujinda Chaiyachad1 Co-author: Viyada Harnchana 1
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
In this project, graphite encapsulated magnetite nanoparticle in carbon matrix was synthesized using a chemical vapor deposition (CVD) and used as a counter electrode of dye-sensitized solar cells (DSSCs). The CVD reaction employed iron(III)nitrate nanohydrate and glucose as precursors, NaCl as a supporting material and methane as a carbon source. The reaction temperature was varied at 700, 750, 780 and 850 ◦C. The DSSC with the synthesized graphite encapsulated magnetite nanoparticle in carbon matrix counter electrode performed the highest solar cell efficiency of 4.56 %. This was higher than the DSSCs with graphite counter electrode produced by the same CVD condition and that with magnetite nanoparticle counter electrode which were 2.36 % and 1.34 %, respectively, and comparable to that of the DSSC with Pt counter electrode which was 4.72 %. The high performance of the graphite encapsulated magnetite nanoparticle in carbon matrix counter electrode was accounted for a combination of a good electrical conductivity of graphite and carbon matrix and a good catalytic property of magnetite nanoparticles.
Material Physics, Nanoscale Physics and Nanotechnology / 77
Giant Dielectric Permittivity and Low Dielectric Loss Tangent in Yb-doped CaCu3Ti4O12 Ceramics
Author: Jakkree Boonlakhorn1 Co-authors: Bundit Putasaeng 2; Prasit Thongbai 3; Santi Maensiri 4; Teerapon Yamwong 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, THAILAND 12120 3 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 4 School of Physics, Institute of Science, Suranaree Universiy, Nakhon Ratchasima, THAILAND 30000
Corresponding Author: [email protected]
In this research work, the giant dielectric response in Ca1−3x/2YbxCu3Ti4O12 (x = 0, 0.05, 0.15) ce- ramics prepared by a modified sol-gel method and sintered at 1100 ◦C for 6 and 12 h were investigated as functions of temperature and frequency. A single phase of CaCu3Ti4O12 was obtained in all ce- 3+ ramic samples. Grain growth of Ca1−3x/2YbxCu3Ti4O12 ceramics was effectively inhibited by Yb doping ions, which can be explained to the effect of solute drag ofYb3+ doping ions. High dielectric permittivity (∼104) and very low loss tangent (∼0.01−0.02) at 1 kHz with good temperature stability ′ ◦ of ε ranging from -55 to 125 C were achieved in a Ca0.925Yb0.05Cu3Ti4O12 ceramic. Furthermore, the dielectric permittivity was found to be nearly independent of frequency (102−106 Hz) and dc bias voltage (0−40 V). Interestingly, the grain boundary resistances of Ca1−3x/2YbxCu3Ti4O12 ceramics
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at room temperature were calculated from the activation energies and found to be ∼0.7−12.5 GΩ.cm. The effect of annealing inO2 atmosphere on the dielectric properties was also investigated. It was 3+ suggested that variations in dielectric properties of Ca1−3x/2YbxCu3Ti4O12 ceramics due to Yb substitution and annealing were associated with the electrical response at grain boundaries.
Material Physics, Nanoscale Physics and Nanotechnology / 120
Phase Formation and Microstructure of Sodium Niobate Powder Synthesized Using Molten-salt Technique
Author: Chavalit Suksri1
Co-author: Sukum Eitssayeam 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
Sodium niobate (NaNbO3;NN) system is a series of alkaline niobate-based ceramics, which is lead- free antiferroelectric material over a wide temperature range of -100 to +360◦C that shows many phase transitions [1]. However, the pure crystallized NaNbO3 ceramic was obtained at high calci- nation temperatures and showed poor homogeneity with large particle size[2]. In this work, the molten-salt technique was used for synthesis of NaNbO3 powder. The use of molten-salt in powder preparation is a method to control the size, shape and increase the rate of solid solution reaction[3]. The metal oxides of NaNO3 and Nb2O5 were mixed and ball-milled for 24 h and then mixed with NaCl:KCl salt. After that, the mixed powders were heated at temperatures from 800 to1050 ◦C. The phase structure and morphology of NN powders were investigated by using an X-ray diffractrometer (XRD) and a scanning electron microscope (SEM). The phase structure of NN powder corresponded to sodium niobate orthorhombic structure JCPDS file No.01-082-0606. The SEM images demonstrated that NN nano-crystals and agglomeration of particles were obtained. The results confirmed that NN nano-crystals have been successfully prepared by the molten-salt method.
References:
1. S. Lanfredi, M. H. Lente, and J. A. Eiras, “Phase Transition at Low Temperature in NaNbO3 Ce- ramic,” Appl. Phys. Lett., 80 [15] 2731–3 (2002).
2. A. Wu, P. M. Vilarinho, I. M. M. Salvado, and J. L. Baptista, “Sol-Gel Preparation of Lead Zir- conate Titanate Powders and Ceramics: Effect of Alkoxide Stabilizers and Lead Precursors,” J. Am. Ceram. Soc., 83 [6] 1379–85 (2000).
3. T. Kimura, “Molten Salt Synthesis of Ceramic Powders”, Advances in Ceramics- Synthesis and Characterization,Processing and Specific Applications,2011
Material Physics, Nanoscale Physics and Nanotechnology / 52
*In situ* XANES Study of MnO2 Electrode for Supercapacitors
Author: Piramon Hampitak1
Co-author: Nonglak Meethong 1
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Page 34 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
Manganese dioxide (MnO2) is one of the most studied electrode materials for use in supercapacitors due to its distinguished properties such as high specific capacitance, environmental compatibility, and low cost. In this study, local and electronic structures of Mn in MnO2 electrode have been in- vestigated by in situ X-ray absorption spectroscopy technique. In situ Mn K-edge XANES spectra measured during constant voltage charge-discharge processes within the potential window of 0-1 V were recorded. The results (Fig. 1) show some little changing of the oxidation state of Mnbecause of redox reaction on only the surface of electrode. This result indicates that within this potential window, ideal capacitive behavior or surface redox reaction occurs, and the intercalation does not occur.
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Material Physics, Nanoscale Physics and Nanotechnology / 295
Rapid thermal annealing and structural properties of lattice-matched InGaPN on GaAs (001) grown by MOVPE
Author: Phongbandhu Sritonwong1
Co-authors: Kentaro Onabe 2; Sakuntam Sanorpim 3
1 Nanoscience and Technology, Graduate School, Chulalongkorn University, Bangkok, THAILAND 10330 2 Department of Advanced Materials Science, The University of Tokyo 3 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Effects of rapid thermal annealing on the structural properties of InGaPN layers grown onGaAs (001) substrates by metal organics vapor phase epitaxy (MOVPE) have comprehensively investigated by using high resolution X-ray diffraction (HRXRD) and Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscopy (AFM). To obtain the lattice-match InGaPN on GaAs, flow rates of trimethylindium (TMIn, In precursor), trimethylgallium (TMGa, Ga precursor) were respectively kept at 14.7 and 8.6 µmol/min for all the samples. While, the N content was controlled by varying flow rate of dimethyhydrazine (DMHy), which is the N precursor, from 300, 700and 1,100 µmol/min. Based on HRXRD and Raman scattering results, the In content was examined to be ~56.2 at%. The N content was estimated to be 1.1 at%, 1.6 at% and 1.9 at% with increasing DMHy flow rate. Lattice-mismatch lower than 0.3% was confirmed for all the samples, corresponding toa lattice-matching condition. Each samples were cut into small pieces and, then, annealed byrapid thermal annealing (RTA) process. Annealing temperature was fixed at 650 oC, which is an optimum growth temperature of GaAs buffer layer. Annealing time was varied from 0, 30, 60, 120 and180s, in order to verify a composition uniformity and crystal ordering. With increasing annealing time up to 120 s, the N content was slightly increased, while for higher annealing time, the N content was dramatically reduced. Also, root mean square (RMS) roughness was observed to be reduced, when annealing time is lower than 120 s. Raman scattering results demonstrated a lowering of b/a ratio with an increasing N content, resulting in a higher crystal ordering. Furthermore, b/a ratio also decreased after RTA. This implies that the N content was increased due to RTA, which isagreedto the HRXRD results. As a result, the RTA process with optimal annealing time significantly improve the structural properties of the lattice-matched InGaPN layers on GaAs (001) substartes.
Material Physics, Nanoscale Physics and Nanotechnology / 100
Page 35 Siam Physics Congress 2015 / Book of Abstracts
Synthesis of Carbon-Encapsulated Fe3O4 for Supercapacitors Elec- trode
Author: Nattapon Kasangam1
Co-author: Viyada Harnchana 1
1 Department of Physics, Faculty of Science, Khonkaen University, Khonkaen, THAILAND 40002
Corresponding Author: [email protected]
In this project, carbon encapsulated Fe3O4 for supercapacitors electrode was synthesized using Fe3(No3)3 9H2O and C6H12O6 as precursors and NaCl as supporting material. The mixture was annealed at 700 ◦C, 720 ◦C, 750 ◦C and 770 ◦C in argon atmosphere for 2 hours and heated at 250 ◦ C in air for 6 hours. The results showed that the supercapacitors with carbon encapsulated Fe3O4 had the maximum specific capacitance of 48.5 F/g in 1 M ofNa2SO4 aqueous electrolyte. This could be attributed to a good electrical conductivity of carbon and the promotion of redox reaction in Fe3O4.
Material Physics, Nanoscale Physics and Nanotechnology / 13
Characterizing Electrical Properties of ZnO Nanowires with Scan- ning Probe Microscopy
Author: Komsun Rapaway1
Co-authors: Annop Klamchuen 2; Dulyawat Doonyapisut 1; Panithan Sriboriboon 1; Worasom Kundhikanjana 1
1 School of Physics, Institute of Science, Suranaree University of Technology, Nakorn Ratchasima, THAILAND 30000 2 National Nanotechnology Center, National Science and Technology Development Agency, Pathum Thani, THAILAND 12120
Corresponding Author: [email protected]
ZnO nanowires have been widely studied due to their unique direct wide band gap of 3.37 eV making it attractive for electronics, optical detectors and light-emitting diodes application. In this work,we focus on ZnO nanowire-metal junction. N-type ZnO nanowires were growth vertically on a silver substrate (of ratio1:1of HTMA:Zinc nitrate) by hydrothermal process at the varied concentration. Characterization ZnO nanowires was conducted using conductive atomic force microscopy allow- ing measurement of I-V characteristic from an individual nanowire. The I-V characteristic reveals a resistive switching behavior, which is sensitive to acquisition time. Understanding the I-V character- istic could shade light on the origin of resistive switching behavior in ZnO nanowires and the nature of ZnO-silver junction. This type of understanding is crucial information for applications.
Material Physics, Nanoscale Physics and Nanotechnology / 225
Synthesis and Characterization of Cu2−xTe Quantum Dot on ZnO Nanoparticles
Author: Aram Boonti1
Co-authors: Atcharawon GARDCHAREON 1; Duangmanee WONGRATANAPHISAN 1; Pipat Ruankham 1; Supab Choopun 1; Surachet Phadungdhitidhada 1
1 Department of Physics, Faculty of Science,Chiang Mai University, Chiang Mai, THAILAND 50200
Page 36 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
It has been shown that semiconducting materials with particle size comparable to exciton Bohr ra- dius, called “quantum dot,” exhibit distinct physical property referring to their bulk. This leads to various applications in computing, biology, solar cell, light emitting, and photodetector. In this work, we synthesized quantum dots of copper telluride on films of zinc oxide using successive ionic layer absorption technique at low temperature. The quantum dots were characterized by transmission electron microscope, scanning electron microscope, x-ray diffractometer, and UV-Vis spectroscope for particle size, morphology, crystal phase, and optical property, respectively. The results showed that the quantum dots were orthorhombic of Cu1.44Te with the average particle size of 5 nm. The growth mechanism of quantum dot will be explained.
Material Physics, Nanoscale Physics and Nanotechnology / 200
Improvement of Graphene-Metal Contacts by Current-Induced Cleaning
Author: Ratchanok Somphonsane1
Co-author: Harihara Ramamoorthy 2
1 King Mongkut’ s Institute of technology Ladkrabang 2 University at Buffalo
Corresponding Author: [email protected]
The issue of contact resistance between graphene and metal contacts is crucial in the development of high-speed graphene devices. However, fabrication-related contamination severely affects the contact resistance in graphene and hence an effective post-fabrication method is needed to resolve this problem. Current-induced cleaning has previously been used successfully to clean the surface of graphene using the concepts of Joule heating. However, its effect on the graphene-metal contact resistance has not been well documented. By studying as many as 20 devices with varying sample sizes and geometry, we demonstrate that current-induced annealing may be used as an effective in- situ annealing procedure to improve the graphene-metal contact resistance which has long been an issue in characterizing graphene-based devices. With this technique, we are able to reduce the overall resistance systematically to around 1000 Ω μm, which is competitive with the best values obtained in the literature to treat this problem. We also demonstrate the effectiveness of current annealing in desorbing contaminants from the surface of the graphene layer, simultaneously shifting the charge- neutrality point to zero back-gate voltage, thus allowing the tuning of carrier density on both the electron and hole sides of the Dirac spectrum. Finally, we highlight certain high-bias effects such as electro-migration that may prove to be detrimental to the operation of these devices.
Nuclear and Radiation Physics / 246
Neutron spectrometry for radiation protection purposes
Author: Thiansin Liamsuwan1
Co-authors: Jatechan Channuie 2; Sarinrat Wonglee 2; Siwapon Munsing 3; Wichian Ratanatongchai 2
1 Thailand Institute of Nuclear Technology (Public Organization), Ongkharak, Nakorn Nayok 26120, Thailand 2 Thailand Institute of Nuclear Technology (Public Organization) Ongkharak, Nakorn Nayok 26120, Thailand 3 School of Medical Physics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok 10400, Thailand
Corresponding Author: [email protected]
Page 37 Siam Physics Congress 2015 / Book of Abstracts
Reliable knowledge of the neutron energy spectrum is valuable for determination of neutron dose equivalent for radiation protection purposes. The reasons are twofold: First, neutron dose equivalent depends strongly on the neutron energy spectrum and, second, most of neutron measuring devices are highly energy dependent. Recently, we have developed a neutron spectrometer for measurement of neutron energy spectra in the energy range from thermal energy up to several tens of MeV. The spectrometer is composed of a 3He proportional counter and several cylindrical neutron moderators made of high-density polyethylene. Each of the measurement values represents the convolution of the spectrometer’s energy response function and the neutron spectral fluence under study. In this development, the energy response of the spectrometer was characterized using the Monte Carlo radiation transport code PHITS (Particle and Heavy Ion Transport System), and the deconvolution algorithm for extracting the neutron energy spectrum from the measurement values was developed under MATLAB (Mathwork, Inc.). The detail of the spectrometer development and its application in neutron metrology and radiation protection in workplaces near the research reactor and high-energy medical linear accelerators will be presented.
Nuclear and Radiation Physics / 126
Design of a BSA for Producing Epithermal Neutron based on D-T Neutron Source for BNCT
Author: Muharani Asnal1 Co-authors: Thawatchai Onjun 1; Thiansin Liamsuwan 2
1 School of Manufacturing Systems and Mechanical Engineering, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, THAILAND 12121 2 Nuclear Research and Development Division, Thailand Institute of Nuclear Technology, Ongkharak, Nakhon Nayok, THAILAND 26120
Corresponding Author: [email protected]
Particle and Heavy Ions Transport code System (PHITS) is used to simulate capability to produce an epithermal neutron flux for BNCT of various beam shaping assembly (BSA) designs. It is assumedin this work that all designs of BSA considered is a cylindrical geometry. It is found that by adopting the flux of 14.1 MeV neutrons from a D-T neutron generator, the design that yields an optimum output 238 is the BSA design with U as multiplier, AlF3 as moderator, Pb as reflector, Al2O3 as fast neutron filter, Li as thermal neutron filter, Ni as gamma shield, and Bi as collimator, in which theoutcoming of the proposed BSA at the beam port can satisfy the criteria for boron neutron capture therapy (BNCT) from the International Atomic Energy Agency (IAEA). It is also found that the output of the proposed design is better than the output of other BSA designs, such as those reported by Eskandari and Kashian 1, Rasouli et al. [2] and Rasouli and Masoudi [3]. In addition, no thermal neutron is found at the beam port of the proposed design. 1 Eskandari M R and Kashian S 2009 Annals of Nuclear Energy 36 1100-1102 [2] Rasouli F S, Masoudi S F and Kasezas Y 2012 Ann. Nucl. Energy 39 18 [3] Rasouli F S and Masoudi S F 2012 Appl. Rad. Isotopes 70 2755
Nuclear and Radiation Physics / 345
Modelling and experimental investigations of irradiation effects in Si radiation detectors
Author: Shyama Rath1 Co-author: Abhay Nayak 2
Page 38 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics and Astrophysics, University of Delhi, Delhi-110007, INDIA 2 St. Stephens College, University of Delhi, Delhi-110007, INDIA
Corresponding Authors: [email protected], [email protected]
This talk is aimed at presenting an overview of Si radiation detectors. and how different typesof radiation influence the short and long term electronic properties and detector performance. The scope of this work is under a Co-ordinated Research Project entitled “ Utilization of ion accelerators for studying and modelling of radiation induced defects in semiconductors and insulators” funded by International Atomic Energy Agency. In particular, I will focus on the activities related to the following aspects: 1. Theoretical modeling and simulation of the device performance: Using commercial device sim- ulation software entailing an electrostatic model using the Poisson and continuity equations. the device parameters such as doping profile, depletion voltage, plots, electric field and potential plots, C-V plots, leakage currents, effect of guard rings, are determined. Such simulation and intercompar- ison with experimental studies helps in failure assessment of radiation induced damage. 3. Optical protocols for characterization of ion-induced defects: Defects such as oxygen-related vacancies and self-interstitials are inherent in as-grown wafers and are also formed by material pro- cessing/irradiation/ and which impact device performance. The use of contactless optical probes to study the formation and annihilation of defects as a result of irradiation will be demonstrated. The overall objective is to disseminate information on radiation effects in Si and other related ma- terials, with a view of motivating undergraduate and Master’s students projects/activities in related areas.
Opening Ceremony / 354
Opening ceremony
Opening Ceremony / 352
Greeting
Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena / 266
An optical surface measurement for laser removal of graffiti
Author: Phumipat Kittiboonanan1
Co-authors: Amarin Ratanavis 1; Jidapa Rattanarojpan 1
1 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s Univer- sity of Technology North Bangkok, Bangkok 10800 Thailand
Corresponding Author: [email protected]
In this paper, we present the creation of a new class of an optical surface measurement based on laser scattering principle. This technique is aimed to serve as a non-destructive testing tool forlaser removal of graffiti. The laser scattering system consists of a weak HeNe laser beam that issplitinto two arms, the reference arm and the sample arm. The reference arm serves as the unaffected graffiti surface while the sample arm performs as the affected graffiti surface. The diffuse reflection ofthe scattering light from both arms is projected on a screen. The image of the screen is then capturedby
Page 39 Siam Physics Congress 2015 / Book of Abstracts
a CCD camera. Full Width at Half Maximum (FWHM) of the intensity distribution of the image is analyzed by using a developed image processing program. The measured FWHMs of the two arms can be analyzed and used to identify the laser cleaning threshold. In this study, an experiment on the angular laser removal of graffiti was setup as an example to testify the diagnostic system under practical conditions. A Q-switched Nd:YAG laser operating at 1.06 microns was used to remove graffiti from mortars. The pulse duration of the laser is 10 ns. The laser cleaning procedures were performed by changing the incident angle of the laser beam. The rate of application of pulses was remained at 1 Hz. The laser fluence was varied from 0.1 J/cm2 to 7 J/cm2. After the application of individual pulse, the assessment of quality of laser cleaning was performed with the laser scattering measurement. The laser fluence of the cleaning threshold varies between 2J/cm and 3 J/cm2 according to the sample properties. This laser scattering measurement provides the simplicity of the optical setup andallows the further development of an online surface inspection potentially exceeding the performance of the current optical inspection technology.
Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena / 273
Arc Discharge Drawing Silica Nanowires
Author: Rattanachai Kowong1
Co-authors: Amarin Ratanavis 2; Wuttichai Putchana 2
1 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Re- search Group (LANDOS), Science and Technology Institute, King Mongkut’s University of Technology North Bangkok 2 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s Univer- sity of Technology North Bangkok, Bangkok 10800 Thailand
Corresponding Author: [email protected]
We propose a new approach, the Arc Discharge Drawing (ADD) technique, to fabricate silica fibers with diameters less than the wavelength of commercial available lasers. With this single-step technique, silica wires with diameters as small as 50 nm were demonstrated. This technique would provide an attractive alternative to current approaches to fabricate the silica nanowires. For ADD technique, a standard optical fiber is placed in two fiber mounts. One ofthe fiber mount performs as the computer-controlled stage that pulls the fiberat various speeds in the range of 2 mm/s to 15 mm/s. During this computer-controlled fiber drawing process, the fiber is heated by the arc discharge serving asthe heat source. The arc discharge is supplied with a D.C. current from a rectifier with a controlled voltage to 20 kV. The nanowires can be fabricated by varying the voltage in the range of 4 kV to 5 kV. The optimum operational voltage is determined by the scanning electron microscope (SEM) images of the fabricated silica nanowires. Based on the SEM images, it is evident that nanowires obtained by the ADD technique exhibit great diameter uniformity and large length. In addition, the fabricated silica nanowires are flexible due to their large aspect ratio between the diameter and the length. Furthermore, the nanowires can be bent and twisted without breaking.The bent and twisted silica nanowires are extremely useful to guide laser light for small scale photonic devices. In this study, the nanowires obtained by ADD technique were also investigated in the aspect of guiding 633-nm wavelength light. The results reveal the high transmission losses thus providing the greater evanescent field. This represents a significant advancement in the field of nanophotonics. Due totheir extraordinary compactness and excellent optical properties, nanowires will find a whole range of nanoscale photonic devices.
Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena / 33
Page 40 Siam Physics Congress 2015 / Book of Abstracts
Cuvette’s effect correction for practical light-scattering experi- ment
Author: Somporn Buaprathoom1
1 Mahidol Wittayanusorn School, 364 Moo 5 Salaya, Phutthamonthon, Nakorn Pathom, Thailand 73170
Corresponding Author: [email protected]
Light scattering is a non-invasive technique to characterize small particles, such as microorganism and powder etc. Therefore, it is wildly used in many fields, for instance, pharmaceutical technology and microorganism detection. There are many authors theoretically calculate the scattered light from a particle for fitting to the experimental measurement to determine the particle characteristics. However in practical experiment, scattering particles are usually contained in a cuvette, therefore the detected scattered-light does not come from only a single particle as the theory but combination of the scattered light from each particle contained in the cuvette. Moreover, the refraction and transmis- sion effects cause the deviation of the experimental scattered light from the theory. Consequently, a correction method for applying the scattering theory to the practical has been developed in this research. It combined Fresnel refraction and transmission theories with Snell’s law to correct the effects from the cuvette and integration method to correct the effect of particle collection. Thescat- tering theory with correction was validated using 1.1 µm and 3.0 µm in size polystyrene latex beads suspended in de-ionized water (LB11 and LB30, respectively). The measurement results showed good agreements between the scattered light measured from the experiment and the scattered light calculated from the scattering theory with correction. The correlation between scattered light from the experimental measurement and the scattering theory with correction was 0.996 whereas the scat- tering theory without correction was 0.894 for LB11. In case of LB30, the correlation between the experiment and the theory with and without correction were 0.979 and 0.685, respectively. These fitting results of scattered intensities from experiment and the scattering theory with andwithout correction showed that the presented correction methods by Fresnel refraction and transmission and Snell’s law and integration method were effective to correct the factor caused by the combination of particles and the cuvettes surface in the scattering set up.
Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena / 257
Measurement of linear thermal expansion by using fiber optic displacement sensor method
Author: Paradai Phanpanich1
Co-authors: Kwan Arayathanitkul 2; Ratchapak Chitaree 2
1 Department of Physics, Faculty of science, Mahidol university, 272 Rama 6 Road Ratchathewi Bangkok, 10400 2 Department of Physics, Faculty of science, Mahidol University, Bangkok 10400, Thailand
Corresponding Author: [email protected]
Fiber optic displacement sensor (FODS) is demonstrated to probe the linear thermal expansion of materials. The device employs an intensity modulation technique which is based on comparing the transmitted light intensity against that of the launch light to provide information on the displacement between the probe and the target. Steel and Aluminum were used as the target. From the thermal expansion phenomena, material will expand when heated. As the displacement between the probe and the material was changed due to the thermal expansion, the intensity signal from reflected light was collected. Although, the displacement between the probe and target was slightly, it could still be detect by the proposal device. The measured linear expansion results are checked against the expected theoretical and the operation of this sensor was also compared with other techniques. Advantages of the proposed technique include non-contact measurement, economical set up and suitability for many applications and precise measurements.
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Optics, Non-linear Optics, Laser Physics, Ultrafast Phenomena / 275
The Development of Proving an Existence of Single Photon by Three Detectors
Author: Ratchanikorn Koomramyakul1 Co-author: Kitisak Boonkham 1
1 Division of Physics, Mahidol Wittayanusorn School, Phutthamonthon, Nakhon Pathom 73170, Thailand
Corresponding Author: [email protected]
The study of quantum optics in Mahidol Wittayanusorn School has established for four years.The latest study was conducted by attenuating blue laser and using the down-conversion crystal. The result of that study was a degree of second-order coherence = 0.412 ± 0.014 which violating the classical inequality. However that is not completely confirmed that single photon exists. The solid confirmation is produced in this study by using three detectors. The 405 nm laser was pumpedinto the down-converted crystal and 810 nm two beams emitted like a cone. The first beam called Gpath went to the photon detector and the second traveled to the beam splitter. The second beam was split into two paths, T and R paths, and also went to the photon detectors. For collected the coincident data, the coincident circuit was used as the counting module. Using three detectors with the same laser source obtained the result that = 0.027561 ± 0.000515 which violate the classical inequality ≥ 1 by the 1888 standard deviation within 30 min of counting time. The result is better than previous study and the concrete confirmation of the single photon existence is completely proved.
Photonics and Optoelectronics / 117
Simulation of circular polarization filter in 1D chiral photonic crystal structure with defect using FDTD method: oblique inci- dence
Author: Prateep Pimsarn1 Co-author: Ratchapak Chitaree 1
1 Applied Optics Research Group, Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand 10400
Corresponding Author: [email protected]
The circular polarization filter is designed in 1-dimensional (1D) chiral photonic crystal structure with defect. In this simulation, the structure is composed of 10 pairs of periodic layers of high (AgGaS2) and low (quartz) refractive index chiral materials with defect layer in the middle. By using finite-different time-domain (FDTD) method, the transmission spectrum from structure reveals the potential of selected right-/left- circular polarization filter for specific wavelength and the effectof oblique incidence on transmission spectrum is presented.
Physics Education (APRU) / 373
Teaching Physics, Conservation Laws First
Physics Education (APRU) / 45
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Teaching Problem-Solving Strategy in Circular Motion to First- Year Science Students
Author: Arunee Eambaipreuk1
Co-authors: Kwan Arayathanitkul 1; Narumon Emarat 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
Many students have difficulties when they solve problems in circular motion. This motivated us to create a problem-solving strategy for such particular topic. The strategy was incorporated in the large-class instruction by including it in a class-worksheet. We expected that the strategy could help students work their way through solving circular motion problems. The sample was composed of first-year science students who enrolled in an Introductory Physics course. They were assigned pre-test and post-test on a problem in circular motion. The effectiveness of the strategy was evaluated fromthe student answers. It was found that after instruction most of the students could solve the problem by following the steps shown in the strategy. In the presentation, we will show how the students solve the problem in the tests before and after they learned the strategy offered in the class-worksheet. In addition, the models of student understanding in circular motion will also be presented.
Physics Education (APRU) / 43
The Use of Interactive Lecture Demonstration to Teach High-School Physics in Magnetic Force on a Moving Charged Particle
Author: Nuttawoot Sricharoenchai1
Co-authors: Kwan Arayathanitkul 1; Narumon Emarat 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
We have adopted the Interactive Lecture Demonstration (ILD) which is one of the active learning strategies to teach high-school students in the topic of magnetic force on a moving charged particle in order to enhance student conceptual understanding. Three sample groups of grade 12 students were studied; G1 and G2 were taught by ILD but students in G1 had a better background of physics knowledge than G2. The other group is G3 which was taught by traditional teaching and their back- ground of physics knowledge was similar to G1.The demonstration set used in the ILD included a cathode-ray tube and a magnet which were common physics apparatus available in most high schools. After instructions, all students were evaluated their conceptual understanding by usinga post-test which is related to this physics topic. The post-test scores of all groups were significantly different with G1 showing the highest score and G3 showing the lowest score. Although the back- ground knowledge of students in G2 was lower than that of G3, the higher post-test score of G2 infers that students who studied by ILD had more conceptual understanding than those who studied in the traditional classroom.
Physics Education (APRU) / 78
Measurement of Triboelectric Charges by Using Faraday’s Cage and Darlington Transistor Circuit
Page 43 Siam Physics Congress 2015 / Book of Abstracts
Author: Chitchanok Lesak1
Co-author: Pornrat Wattanakasiwich 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thai- land; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
When two objects made from different materials are rubbed and immediately separated, negative charges or electrons are then transferred from a surface of one object to another one, depending on material of each object. The charge transfer process due to rubbing is called “triboelectrifica- tion.” This study aimed to measure transferred triboelectric charges by using two methods. Thefirst method is to measure the triboelectric charges using Faraday’s cage and Vernier charge sensor. The second method is to use the Darlington transistor circuit consisting of two transistors to amplify cur- rent induced by electric field of triboelectric charges. The measured values of triboelectric charges from both methods are compared.
Physics Education (APRU) / 249
Investigating ideas of Phayao high school students about Kepler’s law motions and Classical Mechanics
Author: Watcharawuth Krittinatham1
Co-author: Kreetha Kaewkong 2
1 1Division of Physics, School of Science, University of Phayao, Phayao, THAILAND 56000 2 Faculty of Education, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
This research aims to survey the ideas of 120 high-school students, in Phayao province, aboutKe- pler’s laws of motion and classical mechanics. Both topics, all students already studied in Astronomy and Physics classes. Their ideas are investigated by the open-ended questions which allow themto answer and give their reasons to support. Students’ responses are categorized by determining how they apply classical mechanics principles to explain Kepler’s laws of motion. The results reveal that about 50% of all students can describe the Kepler’s laws of motion by determining an angular speed and gravity. Surprisingly, most of them did not give any reasons about conservation of angular momentum, conservation of energy and action-reaction law (Newton’s third law) in solar system. Some critical data are also collected by interviewing the teachers who teach Astronomy and Physics in the surveyed schools.
Physics Education (APRU) / 44
Using Modules to Teach Conservation of Momentum to High-School Students
Author: Trai Unyapoti1
Co-authors: Kwan Arayathanitkul 1; Narumon Emarat 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
Page 44 Siam Physics Congress 2015 / Book of Abstracts
The objective of this study was to improve student’s understanding and problem solving skillfor high-school students in the topic of conservation of momentum in the collision. The topic covered concepts of momentum and impulse, type of collision, law of conservation of momentum and colli- sion in one and two dimensions. We used the learning modules that were composed of the guided worksheet , demonstration for each type of collision and the strategies for problems solving. The modules were used to teach grade-10 students at a school in Bangkok in 2014. Two classes were taught by using the modules. The other two classes were taught by traditional teaching. Afterfin- ishing the topic of momentum, all students were asked to do a test in the topic of conservation of momentum in the collision. The test consisted of 4 questions. Question 1 asked about the direction and speed of collisioninone dimension. Question 2 asked students to determine whether a given situation is elastic or inelastic. Question 3 asked about the equations needed to solve a one dimensional elastic collision. Thelast question asked about a simple collision in two dimension. The preliminary results showed that students in both classes teaching with these new moduleshad significantly better understanding than the traditionary classes.
Physics Education (APRU) / 243
A surveying of high school students’ understanding of buoyant force
Author: Chatchai Hussadorn1 Co-author: Saengkrit Klunboot 1
1 Department of Physics, Faculty of science, King Mongkut’s University of technology Thonburi, 126 Prachautid road, Bangmod, Bangkok 10140 Thailand
Corresponding Author: [email protected]
The understanding students’ conceptual background after the traditional teaching for studying static fluid is one of the most essential keys to design effective teaching activities. The conceptual under- standing of 245 high school students in the topic of buoyant force act on the object in liquid was investigated by using 10 questions conceptual understanding test. The questions were divided into 2 groups. The questions asked to compare the buoyant force act on the objects which hasdifferent mass, volume and density in the same liquid (6 questions) and different liquid (4 questions) were observed. The results of the survey are reported in this study. Furthermore, conceptual misunder- standing held by students is also discussed.
Physics Education (APRU) / 149
Enhancing Students’ Understanding in Simple Harmonic Motion by Using Video Analysis
Author: Jiraporn Boonpo1 Co-authors: Chaiyapong Ruangsuwan 2; Wiwat Youngdee 2
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
Simple harmonic motion is physics’ topic that the student still has misconception and difficulty. Predict-observe-explain approach is based on constructivism. It is designed for engaging the stu- dent to the learning situation while the video analysis technique supports students to link a real
Page 45 Siam Physics Congress 2015 / Book of Abstracts
world and theoretical analysis. Therefore, this study aimed to enhance students’ understanding of simple harmonic motion concepts, including velocity, acceleration and restoring force, by using predict-observe-explain approach integrated with video analysis technique. The participants were 37 grade 10 students in science class at Satrichaiyaphum school, Chaiyaphum province in the second semester of 2014 academic year (November 2014 - March 2015). The research tools were worksheets and lesson plans based on predict-observe-explain approach, Tracker program, and simple harmonic motion conceptual test. Students’ did experiments and observed by using mobile’s camera recorded the motion of mass attached spring and simple pendulum. Then the recorded video was analyzed through Tracker program. The two-tier simple harmonic motion conceptual test as a pre-test and post-test used to determine students’ understanding into five types including complete understand- ing, partial understanding, partial understanding with specific alternative conception, alternative conception and no understanding. The results showed that students’ understanding was developed in all simple harmonic motion concepts.
Physics Education (APRU) / 362
A Robust and Scalable Framework for Question-Answering in Physics
Authors: Bimba Andrew1; Norisma Idris1; Zahrah Binti Ahmada2
1 Faculty of Computer Science and Information Technology, University of Malaya, 50603 Kuala Lumpur 2 Physics Division, Centre For Foundation Studies in Science, University of Malaya, 50603 Kuala Lumpur
Corresponding Author: [email protected]
Over the past two decades, research has shown that students who experience academic difficulties and actively seek help achieve academic success. This finding has resulted in the development of various adaptive help seeking components for adaptive learning environments. However, the ex- isting question-answering systems are designed based on specific templates. Thus, it is not robust enough to cover other learning topics, often providing unrelated answers to questions outside the defined template. In this paper, we tackle this issue by proposing a more scalable architecture which is not restricted by a rigid template. Our proposed framework consists of various modules developed using several artificial intelligence and NLP techniques including semantic network, domain classifi- cation, entity recognition, inference engines and reusable ontologies. Using classification and entity recognition techniques, relationships between topics, principles, concepts and equations are auto- matically represented in a semantic network. This provides knowledge about the superclass-subclass relationships within the domain. Ontology is used to represent the description and properties of each concept in the semantic network. The main purpose of representing this knowledge is to support a system in reasoning about provided information and making inferences. Our proposed framework is envisioned to provide assistance to students, while solving problems.
Physics Education (APRU) / 367
The silent killer of learning
Author: Eric Mazur1
1 Harvard University
Corresponding Author: [email protected]
Why is it that stellar students sometimes fail in the workplace while dropouts succeed? One reason is that most, if not all, of our current assessment practices are inauthentic. Just as the lecture fo- cuses on the delivery of information to students, so does assessment often focus on having students regurgitate that same information back to the instructor. Consequently, assessment fails to focus on the skills that are relevant in life in the 21st century. Assessment has been called the “hidden
Page 46 Siam Physics Congress 2015 / Book of Abstracts
curriculum” as it is an important driver of students’ study habits. Unless we rethink our approach to assessment, it will be very difficult to produce a meaningful change in education.
Physics Education (APRU) / 59
Students’ physics laboratory skill in measurement and uncertainty
Author: Ariyaphol Jiwalak1 Co-authors: Kwan Arayathanitkul 1; Narumon Emarat 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
This study investigates students’ skill in physics laboratory; in particular, measurement anduncer- tainty. Data were obtained from undergraduate physics students from various universities in Thai- land, including the second-year physics students at Mahidol University. It was found from pre-test that most students, who have already passed the introductory physics laboratory class, still lack of these two basic skills. In academic year 2014, the second-year physics students at Mahidol Univer- sity were trained about basic laboratory skills in the first day of laboratory class and once again after they had been learning for half of the semester. Student performance during laboratory class was observed and the students’ laboratory reports were also collected. In the second semester, a worksheet was constructed and applied in a second-year physics laboratory class at Mahidol Univer- sity. The worksheet containing four laboratory questions was created for helping students’ learning in the possible sources of uncertainty in a measurement. The post-test responses of students will be analyzed to assess students’ achievement. The effectiveness of the worksheet will be compared with traditional instruction. It is expected that the worksheet could help improve students’ skill in measurement and uncertainty.
Physics Education (APRU) / 174
Team Teaching in First-Year Physics Class
Authors: Kwan Arayathanitkul1; Narumon Emarat1 Co-authors: Chernchok Soankwan 1; Ratchapak Chitaree 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Authors: [email protected], [email protected]
Team teaching is a strategy that has been used in first-year physics classes at Mahidol University for ten years. This specific method consists of two teachers working together in the same classroom. The courses were Introductory Physics I and II for first-year science students (ranging from250to 300 students) and the lectures were conducted in a large sloping theatre. Worksheets have been used as the main teaching tool which helps promote interactive lectures. Each teacher has their own roles; one being in front of the class conducting students to go through contents and write down on worksheets while the other moving around the theatre to elaborate on the content as well as prompting and answering questions from small groups of students as they solve problems. These roles may be switched occasionally. The study of the effectiveness of the method will be presented. The evidence was gathered from class observation, student learning and student satisfaction which were surveyed from course evaluation and interviews. The results show that each teacher provides a unique strength to the teaching team and the continuous engagement of students.
Page 47 Siam Physics Congress 2015 / Book of Abstracts
Physics Education (APRU) / 330
Physics students’ understanding and problem-solving process of Gauss’s law
Author: Panat Nanthanasit1 Co-author: Pornrat Wattanakasiwich 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand 2 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thai- land; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
Gauss’s law is important in understanding electrostatic; however, it is one of topics that students have difficulties in understanding and solving problems. This study aimed to analyze students’ under- standing of electrostatics while solving Gauss’s law problems. In surveying student understanding of Gauss’s law, a conceptual survey on symmetry and Gauss’s law developed by Singh (2000) were administered to 100 sophomores taking an electric and magnetism course in 2014 academic year. As a result, most students had difficulties with Gauss’s law. Then, 16 students were voluntarily participated in an interview for collecting qualitative data on students’ understanding and problem solving process in Gauss’s law. From the interview results, students had difficulties in identifying enclosed charge in both conductors and insulators. Results have been used to develop a tutorial for help student construct correct understanding in this topic.
Physics Education (APRU) / 251
A Possible Route to Reverse Declining Trend in Student Perfor- mance at First-year University Physics Course
Author: Sirapat Pratontep1 Co-authors: Kittiphong Amnuyswat 1; Korakot Onlaor 1
1 College of Nanotechnology, King Mongut’s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladkrabang, 10520, Thailand
Corresponding Author: [email protected]
A high failure rate is becoming a common occurrence in university physics courses for the first year students. Will there ever be a way out? Here we report a case study of a first-year physics course (with a class size of fifty) at College of Nanotechnology, KMITL. The course has been designed to bridge the gap between basic physics at high schools to advanced physics concepts in materi- als science and nanotechnology. “Physics concepts before maths” has been adopted as the central philosophy, in correspondence with Alan van Heuvelen’s US case study and UK GCSE physics. A question on “What is Physics?” has been used an example to realign the students to the learning method to focus on skills and concepts, rather memorizing details and formulae. Multiple measures have been implanted concurrently, rather than an emphasis on one aspect, including small group teaching, practical demonstration, inquiry methods, regular assignments, customized course design, active learning, pre-mid-term practice test, and a coherent class schedule in the mathematics course. The pre- and post-test results, with a written exam format (no multiple choice), show asignificant improvement in the class average from below 30% to above 60%. The same results have been obtained for three consecutive years. One possible key aspect on the course management that may lead to this improvement is that only a small number of “concepts and skills to take home” are emphasized in each three-hour weekly lesson.
Page 48 Siam Physics Congress 2015 / Book of Abstracts
Plenary / 371
Celebrating Hundred Years of General Relativity
This talk first discusses the history surrounding the discovery of General Relativity by Einsteinin 1915. It next discusses the present status of the theory and some of its shortcomings. Finally, a view on the future of General Relativity will be presented.
Plenary / 374
The string theory – condensed matter flirtation: an eyewitness account
A quake is rumbling through the core of physics: the empiricisms of condensed matter physics and the mathematics of string theory appear to have some deep relations. For the initiated this has an unusually strong allure, but since this cocktail involves some of the most impenetrable areas of physics it is not easy to communicate the excitement to the community at large. I will attempt to get some of it across by telling the story from the perspective of a condensed matter theorist who learned string theory only quite recently. How string theory evolved from a reductionist’s enterprise into some modern incarnation of statistical physics, equipped with general relativity turbo’s and quantum information boosters in the form of the “AdS/CFT” holographic duality. How the universality of general relativity turned into a classification method for phases of matter, including new formsof “quantum” matter characterised by dense quantum entanglements on the macroscopic scale. How the latter reveal highly unusual traits having eerie resemblances with the mysterious experimental observations, with as highlight the famous linear resistivity measured in the strange metal phase of the high Tc superconductors.
Plenary / 370
HRH Princess Maha Chakri Sirindhorn’s Initiatives in S&T for the well-being and benefit of Thai citizens
Her Royal Highness Princess Maha Chakri Sirindhorn was born in Bangkok on the second of April, 1955 as a daughter of Their Majesties King Bhumibol Adulyadej and Queen Sirikit of Thailand. Apart from her excellent background education in history, language and education development, HRH has been interested in science and technology subjects, particularly for the well being and benefit of Thai citizens. Through the IT Project Under HRH Princess Maha Chakri Sirindhorn’s Initiatives, HRH has used information technology to alleviate the underprivileged such as school students in remote areas, people with disability, chronic young patients in hospitals, and inmates. HRH has also keen interest in promoting young Thai scientists and researchers to participate internationally in the advancement of science and technology.
Examples in independent living of people with disability, solar energy for schools in mountainous areas to receive distance learning via satellite, Thai scientist participation in arctic research, and CERN high energy physics will be presented.
Plenary / 372
Page 49 Siam Physics Congress 2015 / Book of Abstracts
Black silicon and the quest for intermediate band semiconduc- tors
Shining intense, ultrashort laser pulses on the surface of a crystalline silicon wafer drastically changes the optical, material and electronic properties of the wafer. The resulting textured surface is highly absorbing and looks black to the eye. The properties of this ‘black silicon’ make it useful forawide range of commercial devices. In particular, we have been able to fabricate highly-sensitive PIN pho- todetectors using this material. The sensitivity extends to wavelengths of 1600 nm making them particularly useful for applications in communications and remote sensing.
Poster-1 - Board: PLA-04 / 11
Development of MeV Carbon-ion PIXE
Author: Chaiyon Chaiwai1
Co-authors: Udomrat Tippawan 1; Yu Liangdeng 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiangmai, 50200, Thailand 2 Thailand Center of Excellence in Physics, Si Ayutthaya Road,Bangkok 10400,Thailand
Corresponding Authors: [email protected], [email protected], [email protected]
In development of MeV heavy-ion particle induced X-ray emission (PIXE) technology which has been demonstrated to be superior to conventional light proton PIXE owing to larger cross sections, MeV carbon-ion PIXE was tested and studied for availability and cross sections. The relatively low ion energy range around 1 MeV for C-ion PIXE had never been investigated before. In the work, C-ion PIXE at ion energy around 1 MeV was firstly tested and demonstrated to be available atour 1.7-MV tandem accelerator and its beam line. In measurement of the cross sections for the MeV C-ion PIXE, 0.8, 1.0 and 1.2 MeV C-ion beams were applied to analyze materials of Si, Fe, Cu, Zn and Au and the spectra were compared with spectra of 1.0- and 2.0-MeV proton PIXE. Results showed that at the same low ion energy of 1 MeV, C-ion PIXE yields were significantly higher by orders than those of proton PIXE which were actually negligible, demonstrating the former significantly more sensitive than the latter. With the 2-MeV proton PIXE cross sections used as the reference, the MeV C-ion PIXE cross sections were calculated. An interesting trend of the cross section against the atomic number Z showed that the cross sections of MeV C-ion PIXE compared with those of proton PIXE for the analyzed materials had a transition around Cu. For lower Z the former was higher than the latter, while for higher Z the former was lower than the latter, indicating MeV C-ion PIXEmore sensitive in detecting lower-Z elements. Detailed experimental and calculating methods as well as discussions are reported in the presentation.
Poster-1 - Board: SUR-13 / 299
Zn(O,S) Thin Films Deposited by Pulse–DC Magnetron Sputtering for an Alternative Cd-Free Buffer Layer
Author: Ekkaphop KETSOMBUN1
Co-authors: Chanwit Chityuttakan 2; Panita Chityuttakan 1; Tula Jutarosaga 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 10140 2 Shanghai Shenke Photovoltaic Novel Material Ltd. Co, Shanghai, China, 201201
Corresponding Author: [email protected]
Page 50 Siam Physics Congress 2015 / Book of Abstracts
Zn(O,S) thin films were deposited on glass substrates using pulse DC magnetron sputtering for60 minutes. The sputtering power was varied from 70 to 100 W with oxygen reactive gas from 0to5 sccm at a constant pulse frequency of 200 kHz at room temperature. The optical properties of Zn (O,S) thin films was characterized by using UV-Visible spectroscopy, the thickness and composition of films were analyzed by Dektak profile and electron probe microanalysis (EPMA). The morphology of films were characterized using atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The transmittance of all specimens were higher than 80% in the wavelength between 300 nm to 900 nm. Optical band gap of Zn (O,S) thin films varied between 3.5 eV to 4.1 eV. The RMS roughness decreases from about 40 nm to about 15 nm when the sputtering power increase from 70 W to 100 W. The composition of Zn (O,S) thin film showed the increase of oxygen content when increasing oxygen reactive gas. The increase of oxygen content increased transmittance of the specimens. Also, the samples with low sputtering power condition contained higher atomic percentage of oxygen than those with high sputtering power. The composition of Zn(O,S) thin film for alternative Cd-free buffer layer can be varied using this proposed method.
Poster-1 - Board: PHO-04 / 331
Dye-sensitized solar cell using a natural dye extracted from Arto- carpus lacucha
Authors: Saman Saekow1; Seksan Lowpa2; Wasan Maiaugree2 Co-author: Vittaya Amornkitbamrung 3
1 Integrated Nanotechnology Research Center, Khon Kaen University, Khon Kaen 40002, Thailand. 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. 3 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. Integrated Nanotech- nology Research Center, Khon Kaen University, Khon Kaen 40002, Thailand. Thaialnd Center of Excellence in Physics, CHE,Ministry of Education, Bangkok 10400, Thailand.
Corresponding Author: [email protected]
Dye-sensitized solar cells (DSSCs) is fabricated from a combination of relatively popular materials − 3− containing nanocrystalline TiO2, electrolyte solution containing I /I redox mediator, counter elec- trode, and natural dye. In this work, the natural dye extract from Artocarpus lacucha with methanol solvent as sensitizers. The photo to current conversion efficiency (η = 0.69%) was obtained byArto- carpus lacucha under AM 1.5 illumination. The short circuit photo-current density (Jsc), open circuit voltage (Voc) and fill factor (FF) are 2.01− mAcm 2, 0.57V and 0.60, respectively.
Poster-1 - Board: AST-10 / 142
Analytical Black Hole Solution in dRGT Massive Gravity
Author: Pitayuth Wongjun1
1 The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000, Thailand
Corresponding Author: [email protected]
Massive gravity is a modified gravity in which a mass is given to the spin-2 field. There arevarious kinds of massive gravity models. One of viable model which is received enormous attention to investigate in cosmology is “dRGT massive gravity”. Since it is a gravity theory, it must reduce to general relativity at Solar system scale. Black hole solution is one of well-known solutions in general relativity at this scale. In this presentation, we try to find an analytical black hole solution in dRGT massive gravity. It is found that the solution can be recover various kind of black hole solutions, for example dS/AdS black hole, black hole with global monopole. We also argue that it is possible to obtain regular black hole from dRGT massive gravity.
Page 51 Siam Physics Congress 2015 / Book of Abstracts
Poster-1 - Board: SUR-09 / 185
Electrical Resistivity of Ti-Ga-P Thin Films Synthesized by Asym- metric Bipolar Pulsed-DC Magnetron Sputtering
Author: Tanachai Ponken1
Co-author: Thanusit Burinprakhon 1
1 Departmet of Physics, Faculty of Science, Khon Kaen University, 40002, Thailand
Corresponding Author: [email protected]
The electrical resistivity of thin films of Ga-P-Ti alloys, deposited on glass substrates by anasymmet- ric bipolar pulse-dc magnetron sputtering method under Ar atmosphere, has been investigated. The sputtering targets containing compacted GaP powder and metallic titanium sheet with thesurface ratio GaP:Ti of 8:1, 5:1, 2:1 and 1:1 were employed. The electrical resistivity of the deposited thin films was measured using the standard van-der-pauw four probe technique under dark and illumina- tion with white light of 70,000 lux conditions. It was found that, under dark condition, the electrical resistivity increases from 7.547E-1 to 9.469E+1 Ω.m for the films deposited from the target having GaP:Ti of 8:1 and 5:1, before sharply reduces to 1.538E-4 and 3.899E-5 Ω.m for the films obtained from the targets having GaP:Ti of 2:1 and 1:1, respectively. The electrical resistivity measured under the lighting condition shows the similar trend. The results indicated that the thin film from the targets having GaP:Ti of 8:1 and 5:1 are semiconductor-like while those from the targets having GaP:Ti of 2:1 and 1:1 are metal-like. The observed behaviors agree well with those found from optical property measurement carried out early. However, the changes of electrical resistivity in responses to lights are inconclusive.
Poster-1 - Board: PHO-01 / 62
Numerical investigation of transmission of graphene based one- dimensional photonic band-gap structure
Author: Surawut Wicharn1
Co-author: Prathan Buranasiri 2
1 Department of Physics, Faculty of Science, Srinakarinwirot University, Bangkok, THAILAND 10110 2 Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, THAI- LAND 10520
Corresponding Author: [email protected]
In this study, a transmission property of one-dimensional photonic band-gap (1D-PBG) structure consisting of two periodically alternated dielectric layers, which the first layer is ordinary dielectric material and the second layer is dielectric material containing graphene multilayer system inside the layer, have been numerically investigated by using transfer matrix method. The numerical results give the transmission spectrum for both transverse electric (TE) and transverse magnetic (TM) po- larization and also show that the position of photonics band-gap locating in terahertz (THz) region. In addition, we exploit that the width of band-gap can be tuned by the properties of graphene layer. Finally, the proposed graphene based 1D-PBG structure can be designed as an efficient passive filter for electromagnetic wave in THz wavelength region.
Poster-1 - Board: NUC-04 / 79
Page 52 Siam Physics Congress 2015 / Book of Abstracts
Determination of Arsenic in Soil, Vegetables and Hair in Khoa Ron Na - Suangchan subdistrict area, Amphoe Ronpibul Using Neutron Activation Analysis Technique
Author: Pattarawadee Maijan1 Co-author: Thawat Chittrakarn 2
1 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai Campus, Songkhla 90110, Thailand 2 Physics department, Faculty of Science, Prince of Songkla University Hat Yai, Songkhla 90112, THAILAND
Corresponding Author: [email protected]
About 100 years ago after the discovery that the Khoa Ron Na -Suangchan subdistrict area, Nakhon Si Thammarat enriched with tin mineral in that area. The adverse effect due to tin miningprocess was the waste Arsenopyrite (FeAsS) which were left over in the tin mine till now. During the rainy season the leachate water that contained with the arsenic compounds in the form of a Arsenopyrite was washed out from the old mine into the surrounding areas. This leachate water can permeate into the canal, underground water, or shallow pond near by the vicinity or villager water resources. So, the poisonous Arsenic will be a part of drinking water or food chain for the Khoa Ron Na - Suangchan subdistrict area people. When the arsenic substance is stored within the human body for a long period of time, this can cause a skin cancer or other health symptom as well. The objective for this project focus on how to measure the small amount of Arsenic that contains in the soil, water, vegetable, and hair samples of people who settled in the Khoa Ron Na - Suangchan subdistrict areaby using the Instrumental Neutron Activation Analysis (INAA) technique. This technique can identify both the qualitative and quantity of Arsenic (As) element that contain in the collecting samples by bombarding the sample with thermal neutron via 75As(n, gamma)76As nuclear reaction. In order to identify the As in the samples, the gamma rays at energy of 559 keV from As-76 with a half life of 26 hours was measured using Gamma ray spectrometer that equipped with HPGe detector. The quantitative analysis of As element in the samples was also obtained via comparative study between the net photo peak spectrum area of 559 keV for both standard and samples materials. The results show that accumulated arsenic in soil, vegetable and hair samples of people who settled in the Khoa Ron Na - Suangchan subdistrict area are in the range of 27.7-101.3 ppm, 2.5-16.1 ppm,.and untraceable, respectively.
Poster-1 - Board: PLA-03 / 97
Increasing of wettability of silk powder using the atmospheric pressure plasma jet treatment
Author: Sakuntala Seehaburan1 Co-authors: Artit Chingsungnoen 1; Phitsanu Poolcharuansin 1; Vallaya Suthikhum 1
1 Department of Physics, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
Corresponding Author: [email protected]
In this research, the surface of sericin silk powder was treated using the atmospheric pressure plasma jet (APPJ). The plasma was generated with the argon and oxygen flow rate of 1.6 slm and0.02slm respectively. The stable discharge occurs with the RF frequency of 76.7 kHz, the plasma currentof 140 mA and the RF power of 5.31 W. The silk powder before treated has the initial water contact angle of 75.7° and the absorption time of 29 s. Although the initial water contact angle decrease a little bit to 60°-70° after 45 s of treatment but the absorption time also clearly decreased to5-7s.This result shows that the plasma exposure can increase the surface free energy and also increase the hydrophilic property of silk powder. Moreover we found that the absorption time of silk powder has no change after exposure in the ambient air. This indicates that the active radicals from theplasma can be adhered tightly on the silk surface. Result from the SEM image of silk powder before and after treated shows that the silk powder looks like fiber with the diameter of 6-8 µmanddoesnot be destroyed with the plasma beam. This plasma jet can be useful for the treatment of the objects having various structures and also could be applied in the cosmetic industries.
Page 53 Siam Physics Congress 2015 / Book of Abstracts
Poster-1 - Board: SUR-12 / 286
Formation mechanism and mechanical properties of titanium oxyni- tride (TiOxNy) thin films deposited by reactive dc magnetron sput- tering
Author: Rachsak Sakdanuphab1 Co-author: Tanakorn Khumtong 1
1 College of Data Storage Innovation, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, THAILAND 10520
Corresponding Author: [email protected]
In this work, the formation of titanium oxynitride (TiOxNy) thin films during a reactive dc mag- netron sputtering process was investigated. TiOxNy thin films were deposited on glass substrates from Ti target at different sputtering power, using O2 and N2 as reactive gases. The structural, sur- face morphology, chemical-bonding and mechanical properties were analyzed by grazing incident x-ray diffraction (GIXRD), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), and nano-indentation techniques, respectively. The GIXRD spectra show the amorphous structure and polycrystalline structure with the increasing of the sputtering power. We found that the peaks shift of TiN structure to the higher angle due to the oxygen incorporation into the crystal lattice. The roughness of the films increases along with the increasing of sputtering power. FromtheXPS analysis reveals the formation of TiO2, TiOxNy and TiN by considering the Ti-2p, O-1s, and N-1s XPS spectra of the films. These results indicate that the sputtering power affects the formationof the TiOxNy thin films. The mechanical properties i.e. hardness and elastic modulus obtained by nano-indentation are in the range of 5.97-12.63 GPa and 85-120 GPa, respectively. The mechanical property of the films relates the crystal structure and the chemical states. The increasing of sputter- ing power enhances the formation of titanium nitride structure and leads to achieve the mechanical property.
Poster-1 - Board: NUC-09 / 328
Neutron Attenuation Performance of Barite Concrete Samples
Author: Roppon Picha1 Co-authors: Jatechan Channuie 1; Jiraporn Promping 1; Kampanart Silva 1; Sarinrat Wonglee 1; Sasiphan Khaweerat 1; Thiansin Liamsuwan 1; Wichian Ratanatongchai 1
1 Thailand Institute of Nuclear Technology
Corresponding Author: [email protected]
For the radiation safety purpose, a mixed concrete wall setup is being designed and tested at Thai Research Reactor. In this work, using barite as the main aggregate, the concrete samples, which were meant primarily to be used as gamma shielding materials, were evaluated for their neutron radiation attenuation properties. A 50-Ci Am-Be was used as the neutron source and aBF3was used to measure the transmitted neutrons. The results between different mixtures are reported and discussed.
Poster-1 - Board: ACC-01 / 51
Influence of Asymmetric Electromagnetic Field Distributions in an RF-gun on Electron Beam Properties
Page 54 Siam Physics Congress 2015 / Book of Abstracts
Author: Wuttiphong Thongpakdi1 Co-author: Sakhorn Rimjaem 1
1 Department of Physics and Materials Science, Facility of Science, Chiang Mai University 50200
Corresponding Author: [email protected]
The electron source of the linear accelerator system at the Plasma and Beam Physics ResearchFa- cility, Chiang Mai University, is a thermionic cathode radio-frequency (RF) electron gun. The gun is a pi/2-mode standing wave structure composing of two S-band RF accelerating cells and a side- coupling cavity. The 2856 MHz RF wave is transmitted from the klystron to the RF-gun through a rectangular waveguide input-port. The RF input-port and the side-coupling cavity are the cause of asymmetric electromagnetic (EM) field distributions inside the gun. This leads to an asymmetric beam transverse shape and the increase of the beam emittance at the gun exit. The problems canbe enlarged when the beams are transported from the RF-gun through the whole accelerator system, which consists of an alpha magnet, a travelling wave linear accelerator, magnet elements and re- lated beam diagnostic components. To investigate the influence of the asymmetric EM fields onthe electron beam properties at the experimental station, beam dynamic simulations are performed by using the computer code PARMELA. The input 2D and 3D EM field distributions are obtained from the RF modeling programs SUPERFISH 7.19 and CST Microwave Studio 2012. Simulation results by using both 2D and 3D field distributions are compared and reported in this contribution. This work has been supported by the CMU Junior Research Fellowship Program, the Development and Promotion of Science and Technology talents project (DPST), and the Department of Physics and Materials Science, Faculty of Science, Chiang Mai University.
Poster-1 - Board: MAG-03 / 210
Effect of Gd substitution for La on the structure and magnetic properties of the La1−x−ySrxGdyMnO3 nanoparticle
Author: Saowalak Saengplot1 Co-author: Sujitra Daengsakul 2
1 Program of Materials Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Corresponding Author: [email protected]
Magnetic nanocrytalline of La1−x−ySrxGdyMnO3 (LSGM) with y = 0, 0.05, 0.10, 0.15 and 0.20 are synthesized by a thermal-hydro decomposition method at 800 ºC in air for 6 h. All samples are characterized by TG-DTA, XRD, SEM and VSM. The XRD result shows that all the prepared samples have perovskite structure with rhombohedral phase. The crystalline sizes are in the range of 18.1– 21.1 nm, which increases with decreasing Gd content (y value). The SEM images of prepared samples show the spherical nanoparticles shape with agglomeration of particles. The VSM result shows soft- ferromagnetic behavior for all samples with the magnetization (M) value of 9.3– 34.6 emu/g. The M value decreases with increasing Gd content. The substitution for La by Gd with a smaller ionic size than La usually leads to a decreases of lattice parameters and decreases of crystalline sizes. The decrease of magnetization value with increasing Gd concentration associated distortion structure with high mismatch factor (σ2).
Poster-1 - Board: AST-03 / 130
Pulsar navigation using Doppler Effect
Author: Jompoj Wongphecauxson1
Page 55 Siam Physics Congress 2015 / Book of Abstracts
Co-authors: Phrudth Jaroenjittichai 2; Siramas Komonjinda 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Autonomous technology in space navigation is a key to explore the solar system and beyond. Cur- rent space navigation technology requires constant communication between spacecraft and ground- based stations with typical error about 4 kilometres per astronomical unit. Pulsars are fast rotating neutron stars. Having high precision (in order of microsecond) in their spin period (approximately second to millisecond), they can be perfect tools for space navigation. As the observed pulsar’s spin period changes with the relative motion between the spacecraft and the pulsar (i.e. Doppler Effect), we can determine the spacecraft’s velocity in pulsar’s direction. Using of three or more pulsars, com- plete velocity information can be determined. Proof-of-concept simulations with three fake pulsars have been done with C programming, which is shown to be consistent. The results indicate that the error strongly depends on the position of the three pulsars. For example, the maximum error occurs when the three pulsar are in the same position.
Poster-1 - Board: AST-04 / 123
A Study the Star Formation of Galaxies in a Nearby Galaxies Group
Author: Panomporn Poojon1
Co-authors: Utane Sawangwit 2; Wichean Kriwattanawong 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 National Astronomical Research Institute of Thailand, Chiang Mai, 50200 Thailand
Corresponding Author: [email protected]
This work aims to study evolution of galaxies, located in a dense environment of a compact group, called NGC 4095 group, that has recession velocities 6,000 < v (km s−1) < 8,000. Imaging observa- tions for BVRc broad-band, [SII] and Red-continuum narrow-band were carried out on the 2.4 m Thai National Telescope (TNT) at Doi Inthanon, Chiang Mai, Thailand. Stellar age and metallicity of the galaxies in this group were estimated by using the model of Pietrinferni (2004). This study shows that late type galaxies tend to be bluer than early type galaxies. Mostoflate type galaxies are ongoing star formation activity, which could be triggered by galaxy-galaxy or tidal interactions and young massive stars in those galaxies caused their colors bluer than early type galaxies.
Poster-1 - Board: PLA-02 / 103
A gridded planar probe as a plasma diagnostic tool in a dc mag- netron sputtering
Authors: Gulthida Khumyong1; Peerawat Laohana1; Preeyaporn Singsar1
Co-authors: Artit Chingsungnoen 1; Nitisak Pasaja 1; Phitsanu Poolcharuansin 1
1 Department of Physics, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
Corresponding Author: [email protected]
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A gridded planar probe has been developed to measure plasma parameters in a dc magnetron sputter- ing discharge. The gridded probe essentially consists of an outer grid in conjunction with theinner collector forming a stacked electrode configuration. The grid space needs to be less than theDe- bye length in order to assume the planar plasma-sheath structure. In addition, the grid-to-collector distance should be shorter than the mean free path of electron ionization collisions to prevent unde- sirable plasma generated inside the probe. The I-V characteristic of the probe is obtained by applying bias voltages to both electrodes but only measuring the current from the collector. Consequently, plasma parameters including ion flux, electron temperature, and ion and electron densities can be calculated from the probe characteristic based on the collisionless planar sheath model. It is found in the ion saturation region that the probe current is almost independent of the bias voltage due to a well-defined planar sheath structure adjacent to the grid. As a result, the ion flux can beobtainedto a fair degree of certainty. For the discharge conditions achieved in this study, electron density and temperature are found in the range of ~1015 m−3 and 2-6 eV, respectively, which agree well with those obtained using a cylindrical Langmuir probe and a flat probe with a guard ring.
Poster-1 - Board: SUR-07 / 85
Investigating spectral response of CuIn1−xGaxSe2 thin film solar cells by quantum efficiency measurements
Author: Supathat Sukaiem1
Co-authors: Boonyaluk Namnuan 1; Busarin Noikaew 1; Sojiphong Chatraphorn 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Quantum efficiency (QE) measurement is one of several methods used to investigate solar cell perfor- mance, especially the carrier collection. It indicates the amount of photogenerated current produced when a solar cell is illuminated by photons of a particular wavelength. In this study, a quantum ef- ficiency measurement system was constructed and the CuIn1−xGaxSe2 (CIGS) – based thin film solar cells with different growth conditions were characterized. The results show an influence of differences in band gap energy on photo-current collection. The changing in collected currentand absorption edges can be observed. In addition, quantum efficiency measurement is used to identify the properties of each thin film layer comprising the devices. The current leakage due to a defective p-n junction leads to sharp drops in QE spectrum at some particular wavelengths. However, not only the basic quantum efficiency measurement was used but the lock-in amplifier technique was also applied to this system in order to enhance signal-to-noise ratio. The results of both techniques were compared and exhibited an improvement of data acquisition.
Poster-1 - Board: AST-07 / 98
The properties of Traversable Wormholes
Author: Nopadhol Kamma1
Co-author: Pitayuth Wongjun 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000, Thailand
Corresponding Author: [email protected]
General relativity theory is a gravitational theory describing relation between spacetime geometry and mass/energy. General relativity provides mysterious prediction of spacetime geometry such as black holes and wormholes. Black hole is a spacetime geometry surrounding a massive object in
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which there exists a characteristic radius that even light cannot be escaped from the object. Worm- hole is a spacetime region which connects between two asymptotically flat spacetimes. In fact, the wormholes can exist in the black hole solution, even in the simplest solution called Schwarzschild solution. However, it is not possible to travel through this region by human. Recent investigation shows that it is possible to construct the theoretical model of wormhole in which human can travel through namely “Traversable Wormhole”. The objective of this project is to investigate geometries and properties of the traversable wormhole. First, we study basic properties of a simple wormhole in Schwarzschild and Reissnor-Nordstrom geometries. It was found that the traversable wormhole must satisfy three conditions as follows: the horizon is absent in the wormhole, travelling time in the wormhole travel is about 1 year, and gravity in the wormhole is comparable to gravity on the Earth. To create such the wormhole, one may need an exotic matter and the properties of this matter are left to investigate for further work.
Poster-1 - Board: SUR-04 / 35
Incorporation of Cu-Se to Cu-Ga-In precursors for the fabrica- tion of CuIn1−xGaxSe2 thin film solar cells
Author: Kwanruthai Butsriruk1 Co-authors: Namnuan Boonyaluk 1; Sojiphong Chatraphorn 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Cu-In-Ga (CIG) metallic precursor thin films were fabricated by sequential depositions of Cu-Ga and In on Mo-coated soda lime glass (SLG) substrates. Due to low melting point of In and adhesion issues of the CIG metallic precursor, the substrate temperature was optimized for the depositions of In and Cu-Ga layers. It was found that the sequence of the depositions of Cu-Ga and In affected the formation of alloying precursors. In this study, CuIn1−xGaxSe2 (CIGS) thin films were obtained by the co-evaporation of Cu-Se during increasing the temperature of the CIG metallic precursors from 150℃ to 450℃, and followed by vacuum annealing at 450℃. The duration time of the Cu-Se flux and the annealing processes were among important varying parameters. The formation andthe chalcopyrite phase of the CIGS layer were determined by FESEM and XRD, respectively. The CIGS thin film solar cells were also fabricated and tested for their I-V characteristics as well asquantum efficiency measurements (QE) to observe their spectral responses. The best efficiency oftheCIGS solar cells obtained from the absorber fabricated by this method was 13.2%.
Poster-1 - Board: ACC-02 / 89
Development of C-shape Dipole Electromagnet as an Electron En- ergy Spectrometer
Author: Nuntawuth SUDLOY1 Co-author: Sakhorn RIMJAEM 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University 50200
Corresponding Author: [email protected]
A dipole magnet is one of important components in particle accelerators. It can be used to bend the charged particle beam with desired deflection angle and direction. Moreover, it can be used as an energy spectrometer. This research focuses on development of a dipole electromagnet for measurements of energy and energy spread of electron beams that produced by the linear accelerator at the Plasma and Beam Physics Research Facility, Chiang Mai University. The main purpose of the research is to develop a dipole magnet with the deflecting angle of 60 degree for the electron beams
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with a maximum energy approximately 10 MeV. Two well-known computer programs Poisson and Radia are used to simulate 2D and 3D models, respectively. The optimized magnet prototype has a C-shape, which is convenient for installation in the accelerator beamline. It has a gap between the magnetic poles of 2.2 cm and can produce magnetic fields with the maximum magnetic fields intensity up to 0.35 T. The magnetic field deviation from the maximum value is less than 0.5 percent. To obtain the magnetic field value and deviation as required, the two conducting coils musthave 1,300 winding turns with a maximum applied current of 5 A. This work has been supported by the CMU Junior Research Fellowship Program, and the Department of Physics and Materials Science, Faculty of Science, Chiang Mai University.
Poster-1 - Board: PHO-02 / 255
Hybrid bulk-heterojunction solar cells based on poly(3-hexylthiophene) and ZnO nanostructures
Author: Pipat Ruankham1
Co-author: Takashi Sagawa 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200 2 Graduate School of Energy Science, Kyoto University, Kyoto, JAPAN 606-8501
Corresponding Author: [email protected]
Photovoltaic performance of hybrid ZnO nanorods (ZnO NRs)/ polymer solar cells is enhanced through the addition of ZnO nanoparticles (ZnO NPs) into poly(3-hexylthiophene) (P3HT) absorber layer. A mixture of ZnO NPs:P3HT, acting as photo-active layer, is coated onto ZnO NRs, serving as electron acceptor, by spin-coating technique. The ZnO NPs/P3HT blend is able to infiltrate intothe interrod space, as confirmed by field emission scanning electron microscopy (FE-SEM) observation. The ZnO NPs/P3HT (13% by volume) blend-coated ZnO NR device shows the maximum powercon- version efficiency of 1.02%, which is higher than that of the pristine ZnO NRs/P3HT device (0.26%). The enhancement is mainly attributed to the larger ZnO/P3HT interface area and higher charge collection, as observed by an increase of the external quantum efficiency.
Poster-1 - Board: ACC-06 / 191
Trajectory Simulation of Ion Beam from Duoplasmatron Ion Source
Author: Suratsa Meebua1
1 Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla, THAILAND 90110
Corresponding Author: [email protected]
This project aims to study about structure and function of Duoplasmatron ion source inTandem accelerator. We used program SIMION to simulate ion beam from Duoplasmatron ion source. If we use SIMION, we can get appropriate parameters that show the best ion beam. The best ion beam is the beam that has little spread and looks parallel. After simulation the ion beam withSIMION, result show that the best ion beam occurred when an anode 0 volt, extractor -10 kilovolts, einzel lens, respectively. The experimental set up comprise of three conditions as following: are Einzel lens comprise of section 1 and 3 set as 0 volt and einzel lens section 2 which is the middle section set as -10 kilovolts. Result showed that the ion beam from experiment are close to parallel and have a little spread, like result from simulation. So, the simulation from SIMION can help us tosavetime, materials and money to pay from repeated the experiment several times.
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Poster-1 - Board: SUR-05 / 75
Characterizations of PZT films prepared by sol-gel spin coating method
Author: Pichitchai Butnoi1 Co-authors: Kamonpan Pengpat 2; Nuttapon Pisitpipathsin 3; Patamas Bintachitt 4; Putapon Pengpad 5
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand 2 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thai- land. 3 Department of Applied Physics, Faculty of Sciences and Liberal Arts , Rajamangala University of Technology Isan , Nakhon Ratchasima 3000 , Thailand. 4 Department of Physics, Faculty of Science, Srinakharinwirot University, Sukhumvit, Bangkok, 10110, Thailand. 5 Thai Microelectronics Center (TMEC), National Electronics and Computer Technology Center, Chachoengsao, 24000, Thailand
Corresponding Authors: [email protected], [email protected]
Lead zirconate titanate (PZT) films have been widely used for micro applications because of their excellent ferroelectric and piezoelectric properties. In this study, surface morphology and electrical properties of lead zirconate titanate films have been investigated. The PZT films have beenpre- pared by a sol-gel method and deposited on silicon wafers by spin coating under different annealing processes. Phase formation behavior of these films was investigated by an X-ray diffraction (XRD). The Atomic Force Microscopy (AFM) explains morphology, such as surface roughness, grainshape and grain size. Dielectric properties were studied using LCR meter measurement and discussed in this paper. PZT films show a perovskite phase at annealing temperature of 650 ℃. For thefilms thickness were in the range of 500 – 900 nm. Average grain size increase with increasing the anneal- ing temperatures. Dielectric constant show the highest value which was found at condition of 650 ℃.
Poster-1 - Board: SUR-01 / 10
Growth of graphene triangles and stripes on Si-face SiC (0001)
Author: Akkawat Ruammaitree1 Co-authors: Hitoshi Nakahara 2; Yahachi Saito 2
1 Department of Physics, Faculty of Science and Technology, Thammasat University, Pathum Thani, THAILAND 12121 2 Department of Quantum Engineering, Graduate School of Engineering, Nagoya University, Nagoya, JAPAN 464-8601
Corresponding Author: [email protected]
Graphene on silicon carbide (SiC) has a potential for technological application devices. The elec- tronic properties of graphene in nanometer scale are significantly influenced by morphology, edge structures and so on. In this report, we have studied the growth of the epitaxial graphene on silicon- terminated SiC (0001) by annealing the SiC substrates in ultra-high vacuum and various types of inert gas (He, Ne and Ar) at pressure of 0.05 atm. Striped graphene islands are often observed at the step edge of all samples but the triangular graphene islands are only found on the SiC surfaces which contain wide terraces (> ∼ 1.5 micrometer). Shape of graphene islands and zigzag edge type of triangular graphene islands were revealed by scanning electron microscope and reflection high- energy electron diffraction. Moreover, the growth mechanism of the triangular graphene islands is emphasized.
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Poster-1 - Board: NUC-08 / 307
Development and Dose Evaluation of Natural Topaz for Dosime- ter Radiation
Author: Ekachai Hoonnivathana1
Co-authors: Kittisakchai Naemchanthara 2; Sirinapa Namno 2; Vanlaya Vongsanit 2
1 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand 2 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Corresponding Author: [email protected]
In the present work, natural colourless topaz from Pakistan were irradiated gamma ray at different dose from 50-400 Gy. The samples were characterized by thermoluminescence (TL) and electron spin resonance (ESR) spectroscopy. The TL results showed that the luminescence center of topaz was appeared at 150 and 225 C. The intensity of TL was increased with increased radiation dose. The 3+ − ESR signals with g = 1.966 and 2.012 due to Ti and (AlO4) centers, respectively and increased with radiation dose. Percent error of evaluated dose from TL and ESR signals were 8 and 3, respectively. This study showed that the topaz can be used a radiation dosimeter.
Poster-1 - Board: ENV-01 / 2
Estimation Density and Viscosity of Ethyl-Biodiesel from Saponi- fication Number and Iodine Value
Author: Suriya Phankosol1
Co-authors: Kanit Krisnangkura 2; Kaokanya Sudaprasert 3
1 Department of Industrial and Technology Management, Faculty of Science and Technology, Bansomdejchaopraya Rajabhat University, Bangkok 10600, Thailand 2 Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi (Bangkhuntien), Bangkok, 10150, Thailand 3 Division of Energy Technology, School of Energy, Environment and Materials, King Mongkut’s University of Tech- nology Thonburi, Bangkok, 10140, Thailand
Corresponding Author: [email protected]
Density and viscosity are an important physical property of biodiesel. In this work, proposed a single empirical equation can be estimated without the prior knowledge of the density and viscosity of an individual fatty acid ethyl ester, an empirical approach for estimation the density and viscosityof ethyl-biodiesel are correlated to saponification number (SN), iodine value (IV) and temperature. Data available in literatures are used to validate, and support the speculations derived from the proposed equation. The proposed equations are easy to use and the estimated density and viscosity values of ethyl-biodiesel at different temperatures agree well with the literature values. It is shown thatit can estimate the densities and viscosities of ethyl-biodiesel with average deviations were 0.28% and 4.20%, respectively.
Poster-1 - Board: ENV-02 / 207
A small vertical axis wind turbine
Author: Singkarn Chanprateep1
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1 Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla, THAILAND 90110
Corresponding Author: [email protected]
The main objectives of this project were to design and construct the compact Savonius vertical axis wind turbine having cut-in speed of 3 m/s. This Savonius wind turbine was made of 4 S-shaped blades steel coating with Zinc with diameter of 1 m. Power of wind was transferred to generator by using O-ring at pulley ratio of 1:25 The results showed that at wind speed of 3.0 m/s the power efficiency of wind turbine was about of 55.95% whilst the efficiency of wind turbine was relatedto wind speed.
Poster-1 - Board: ACC-05 / 159
Study of a 270-degree non-dispersive bending system.
Author: Pattadon Udomsanti1
Co-author: Chitrlada THONGBAI 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, 50200
Corresponding Author: [email protected]
A non-dispersive bending system is a magnetic system, which charged particles of different energies bend and move out from the system at the same point. Theoretical conditions for being a non- dispersive system are the dispersion function and its derivative vanish at the system exit. In this research, we study the non-dispersive bending system consisting of three sector dipole magnets for a total bending angle of 270 degree. Numerical calculations are performed using matrix formalism under a linear beam dynamics condition. A computer program is developed to track the electron trajectories. The study results will be used as a guideline for further design of the realbending system.
Poster-1 - Board: SUR-11 / 261
Dye-sensitized solar cell based on hydrothermally deposited NiS counter electrode
Author: Wasan Maiaugree1
Co-authors: Ekaphan Swatsitang 1; Samuk Pimanpang 1; Vittaya Amornkitbamrung 1; Weerawat Kanmuang 1
1 Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, THAILAND
Corresponding Author: [email protected]
NiS films were prepared by a hydrothermal technique on FTO glass substrates. The NiS filmswere used as a counter electrode electrodes of dye-sensitized solar cell. The dye-sensitized solar cell base on NiS exhibited performance with the energy conversion efficiency of 8.33%, open-circuit voltage of 0.74 V, short-circuit current of 16.23 mA.cm−2, and fill factor of 0.69 under full sunlight illumination (100 mW.cm−2, AM 1.5G). This performance is close to the devices using platinum as the counter electrode (8.48% ).
Poster-1 - Board: AST-01 / 214
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TNT Photometric Reverberation Mapping campaign of High-z Quasars
Author: Grittiya Pongsupa1 Co-authors: Suwicha Wannawichian 1; Utane Sawangwit 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Motivated by the upcoming photometric surveys that will cover a broad range of wavelengths and regularly monitor a fair fraction of the sky with good photometric accuracy (e.g. the Large Synoptic Survey Telescope, LSST), we aim to provide proof-of-concept that photometric reverberation map- ping of the Broad Line Region (BLR) in quasars is feasible at high-z and fainter magnitudes than that already shown by previous study. This technique is very important if we were to determine the masses of Super Massive Black Holes (SMBH) powering the high-z quasars where the traditional spectroscopic Reverberation Mapping (RM) method would fail. Here, we will describe our high-z quasar photometric reverberation mapping campaign (PI: U. Sawangwit) being carried out with the 2.4-meters Thai National Telescope (TNT) at Doi Inthanon. Our selection criteria have been designed to ensure the quasar BLR sizes and hence their lag time is well covered by the observing season of the TNT. This results in a sample of 30 spectrally confirmed quasars, selected from SDSS-III BOSS survey to be further studied with the Photometric RM during the 2014-2015 observing season. Due to the magnitude limited nature of the spectroscopic survey, the z > 1.5 quasars are intrinsically very luminous and therefore have very long lag time (and large BLR size), to ensure our survey remain complete we hence limit our quasar sample to z < 1.5, g ≤ 21.5mag and the inferred BLR size from R-L relation to 60 light-day.
Poster-1 - Board: OPT-01 / 212
Single Beam Digital Holography using Total Internal Reflection
Author: Suwan Plaipichit1 Co-author: Prathan Buranasiri 2
1 Department of Applied Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 2 Department of Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Corresponding Author: [email protected]
The technique for recording digital hologram, using single beam based on Total Internal Reflection (TIR), has been proposed. The laser diode with wavelength of 635 nm has been used as the light source. First, a positive resolution test target with a line width of 200 um has been used as the ob- ject to compare two configurations (transmission and reflection)of digital in-line holography (DIH). From experimental results, the reconstructed digital hologram of reflected DIH (RDIH) is perfect as transmitted DIH(TDIH). The equilateral triangle prism has been used to produce TIR lightand fingerprint has been selected as the sample. The configuration, applied in this TIR technique,is the same as RDIH one measured from the positive resolution test target. The results show that the reconstructed digital hologram of fingerprint provides sharper patterns than the recorded digital hologram.
Poster-1 - Board: OPT-02 / 213
Developing and demonstrating the investigation of fingerprints on a glass surface by using digital holography technique.
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Authors: Thanakarn Tasingkum1; Thanva Tubthong1; Thong-on Thanyarat1
Co-authors: Chantira Boonsri 1; Prathan Buranasiri 1; Suwan Plaipichit 2
1 Department of Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 2 Department of Applied Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Corresponding Author: [email protected]
In this research, a technique of digital holography has been applied to investigation of latent fin- gerprints on a surface of clear transparent glass plate. In this technique, a CCD camera is put at the image plane instead of photographic film in typical holography. In our technique, a Michelson interferometer has been setup for splitting a laser beam from a semiconductor laser to animage bearing beam and a reference beam for recording a hologram. By using a numerical technique for reconstructing record images from the CCD camera, a sharp result images and their details have been shown. The benefit of this technique may be improved for investigating a fingerprint on thesurfaces of different kinds of construction materials such as woods, ceramics, or metals in the future.
Poster-1 - Board: AST-02 / 132
Analysis of Color Magnitude Diagram by Aperture Photometry Tool
Author: Kamolporn Haewsantati1
Co-author: Suwicha Wannawichian 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
The variations of stellar brightness in globular clusters are major evidence of their evolutions. In this study, optical images of two globular clusters were taken. First, images of NGC6121 (M4) were taken by Panchromatic Robotic Optical Monitoring and Polarimetry Telescopes 8 (PROMPT 8) at Cerro Tololo national observatory, Chile. Later, images of NGC7078 (M15), were taken by 2.4m Telescope at Thai National Observatory in Thailand. The images were reduced and analyzedby Aperture Photometry Tool to measure the absolute magnitude for each star in the cluster. The calcu- lated magnitudes were used to create plots between color index B-V and the apparent magnitude in filter V. The plot is generally known as Color Magnitude Diagram (CMD), which is asimpleformof Hertzsprung - Russell diagram (H-R Diagram). CMD for NGC6121 and NGC7078 were compared to previous studies by Patrick R. Durrell and William E. Harris (1993) and G. Alcaino, W. Liller, and F. Alvarado (1997) respectively. The results from this study show similar evolution trends to previous studies. Upon the analysis of the evolution curves, the positions of the main-sequence turnoff are found to be at V ∼ 16−17, (B −V ) ∼ 0.8−1.0 for NGC6121 and V ∼ 19−20, (B −V ) ∼ 0.3−0.5 for NGC7078. Furthermore, the ages of both clusters were calculated based on the magnitudes of stars at the positions of the main-sequence turnoff. We found that their ages are different from the previous studies, although in the same order of Gyr. For further detailed analysis, the effect of extinction due to interstellar medium should be taken into consideration.
Poster-1 - Board: ACC-04 / 136
Study of Undulator Radiation from Femtosecond Electron Bunches
Author: Natthawut CHAISUEB1
Co-author: Sakhorn RIMJAEM 1
Page 64 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
Linac based terahertz (THz) source at the Plasma and Beam Physics (PBP) Research Facility, Chi- ang Mai University, consists of a thermionic RF electron gun, an alpha magnet for magnetic bunch compressor, a travelling wave s-band accelerating structure for post acceleration, and various beam diagnostic instruments. The PBP-CMU linac can produce relativistic femtosecond electron bunches, which are used to generate coherent THz radiation via transition radiation technique. To increase the radiation intensity, an electromagnetic undulator will be added in the beam transport line. The existed electromagnetic undulator at the PBP research facility have a period length of 55 mm with an undulator parameter of approximately 1 or equivalents to a peak magnetic field of around 0.2 T. Numerical calculation result shows that the brightness of the undulator radiation, which is produced from electron bunches with an energy of 10 MeV, a peak current of 300 A, and an effective bunch length of 120 fs, is 105 times higher than the brightness of the transition radiation. This study in- vestigates the dependence of the electron beam energy, electron bunch charge, and electron bunch length on the undulator radiation. The numerical simulation and procedure to generate the undu- lator radiation in the terahertz regime by using femtosecond electron bunches produced at the PBP research facility is reported and discussed in this contribution.
Poster-1 - Board: NUC-01 / 26
Radiological Hazard Assessment and Radioactive Contour Maps in Surface Soil Samples Collected from Satun Province, Thailand
Author: Prasong Kessaratikoon1 Co-authors: Marina Meena 1; Ruthairat Boonkrongcheep 1; Suchin Udomsomporn 2; Supphawut Benjakul 1
1 Nuclear and Material Physics Research Unit (NuMPRU), Department of Physics, Faculty of Science, Thaksin Univer- sity, Muang, Songkhla, THAILAND 90000 2 Office of Atoms for Peace (OAP), 16 Vibhavadi Rangsit Rd, Chatuchak, Bangkok, THAILAND10900
Corresponding Author: [email protected]
The specific activities of natural (40K, 226Ra and 232Th) and anthropogenic (137Cs) radionuclides in 135 surface soil samples collected from 7 districts in Satun province in the southern region of Thai- land were measured and determined. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system. The KCL, IAEA/RGU-1, IAEA/RGTh-1 and IAEA/SL-2 reference materials were used to analyze the concentration of 40K, 226Ra 232Th and 137Cs in all samples. It was found that the specific activities of 40K, 226Ra, 232Th and 137Cs ranged from 292.84 − 17260.59, 5.62 − 812.02, 1.49 − 409.53 and 2.04 − 16.28 Bq/kg with mean values of 4146.73 ± 251.13, 102.54 ± 7.05, 124.46 ± 4.52 and 5.55 ± 2.41 Bq/kg, respectively. Further- more, four radiological hazard indices which are gamma absorbed dose rate (D), radium equivalent activity (Raeq), external hazard index (Hex), and annual effective dose rate out(AED ) in the investi- gated area were also studied and evaluated. The average values of D, Raeq,Hex and AEDout were equal to 299.03 ± 16.58 nGy/h, 604.83 ± 33.07 Bq/kg, 1.63 ± 0.09 and 0.37 ± 0.02 mSv/y, respec- tively. The results were also compared with the Office of Atoms for Peace (OAP) annual reportdata, Thailand and global radioactivity measurement and evaluations. Moreover, the result canbeused to create the radioactive contour maps of the investigated area.
Poster-1 - Board: PLA-01 / 281
Synthesis and Characterization of amorphous carbon film for po- tential application in cell culture
Page 65 Siam Physics Congress 2015 / Book of Abstracts
Author: Watcharaporn Intatue1 Co-author: Dheerawan Boonyawan 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University 239 Huaykaew Road, Tumbol Suthep Amphur Muang, Chiang Mai 50200 THAILAND 2 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University Faculty of Science Chiang Mai University 239 Huaykaew Road, Tumbol Suthep Amphur Muang, Chiang Mai 50200 THAILAND
Corresponding Author: [email protected]
Plasma enhanced chemical vapor deposition (PECVD) is one of the method of coating thin film for improve surface material properties which can be apply to electronic, medicine and bio molecular. This research focuses on coating amorphous carbon thin film by PECVD technique for cell culture applications. PECVD is the process operated at low temperature, able to control compound and prop- erties of film as well, with high deposition rate and good adhesion with substrate. We synthesized amorphous carbon film from plasma of gas mixture between acetylene and ammonia at gasvarious and characterized amorphous carbon film by context angle, Atomic Force Microscope(AFM),Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS) and Scanning Elec- tron Microscope (SEM). Mixed gas plasma parameters has been carried out by a rf-compensated Langmuir probe. The op- erating RF power vary from 20 to 80 W and gas pressure from 100 to 300 mTorr, respectively. The result showed electron temperature increased when RF power increased but it decreases when gas pressure increased.
Poster-1 - Board: ACC-07 / 356
An Application of Synchrotron-based X-ray Absorption Spectroscopy Study on Advanced Functional Materials
Author: Pinit Kidkhunthod1
1 Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand
Corresponding Author: [email protected]
The investigation of the local geometric and electronic structure of probing element in bulk samples is the most extensive field of application in X-ray Absorption Spectroscopy (XAS). XAS consists of two main regions which are X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The former region is used to explain the local geometry and oxidation states of selected element in a sample whilst the latter one is used to address the local structure around probing element in samples. In my work, the XAS beamline : SUT-NANOTEC- SLRI XAS beamline (BL 5.2) at the Synchrotron Light Research Institute, THAILAND, and applica- tions of synchrotron-based XAS on advanced functional materials such as carbon-ferrite composite nanofibers and thermoelectric materials will be introduced in order to obtain the accuracy oftheir locally structural information which cause different properties in these materials.
Poster-1 - Board: AST-06 / 176
A Study of the Orbital Period of a Binary System V2790 Ori
Author: Sarawut Choolok1 Co-authors: Jirapon Dalaeman 1; Thongthai Choolakha 1
1 Department of Physics and General Science, Faculty of Science and Technology, Songkhla Rajabhat University, Songkhla 90000, Thailand
Page 66 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
V2790 Ori is a W Uma Eclipsing Binary with an orbital period of 0.28784200 day. From the previous investigation of its light curve, it was found that this binary system has a continuous orbital period change. In this research, new photometric B V and R light curves have been obtained to compute time of minimum light. Using the previously published time of minima and the value obtained in this research, an O - C curve of V2790 Ori was constructed. It was found that, this curve trends toward a downward parabolic variation. The result reveals that the orbital period of V2790 Ori there was a decrease in the rate 9.81954433 × 10−6 seconds per year to 4.263948685 × 10−6 seconds per year.
Poster-1 - Board: OPT-03 / 298
An application of Optical Coherence Tomography (OCT) to mea- sure sucrose concentrations
Authors: Chittanon Buranachai1; Sirirat Ouiganon1
Co-authors: Chongdee Thammakhet 2; Panote Thavarungkul 1; Proespichaya Kanatharana 2
1 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai 90112, Thailand 2 Department of Chemistry, Faculty of Science, Prince of Songkla University, Hatyai 90112, Thailand
Corresponding Author: [email protected]
This work focused on applying the optical coherence tomography (OCT) technique to measure con- centrations of sucrose, one of the most widely used sugars in food industry, in solutions. Because the indices of refraction varied with the amount of sucrose dissolved in the solutions, OCT could be used to quantify the sucrose concentration by measuring the optical path length changes. In addi- tion, near-infrared (NIR) light used in OCT often offered better penetration depths for samples with color or turbidity, enabling the technique to measure the sucrose concentrations even in colored me- dia. Initially, transparent aqueous solutions with various sucrose concentrations were loaded into a flow cell and the optical path lengths of the cell were measured by OCT to obtain calibration curves. After optimizations, the system performances were tested. Finally the system was used tomeasure sucrose concentration in both transparent and colored liquid samples.
Poster-1 - Board: AST-05 / 197
Study and analysis of the new eclipsing PCEB system: SDSS J074548.63+263123.4
Author: Niwat Hemha1
Co-authors: Nuanwan Sanguansak 1; Puji Irawati 2; Tom Marsh 3; Vik Dhillon 4
1 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 2 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand 3 Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom 4 Department of Physics and Astronomy, University of Sheffield , Sheffield S3 7RH,UK
Corresponding Author: [email protected]
The common-envelope process is known as one of the complicated phases in binary evolution. Alot of efforts have been dedicated to study this common-envelope stage, but the many questions related to this process are yet to be answered. If one binary survives the common-envelope, the binary will emerge as a white dwarf accompanied by low-mass main sequence star in close orbit, or often
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referred as the post common-envelope binary (PCEB). SDSS J074548.63+263123.4 is one of the newly found PCEBs from the Sloan Digital Sky Survey (SDSS). In this work, we aim to confirm the eclipsing nature of J074548.63+263123.4 and to determine the stellar and orbital parameters. The primary eclipse in the light curve of SDSS J0745+2631 from our follow-up observation using the ULTRASPEC instrument from the Thai National Observatory. The data in g′ filter showed an evidence of the primary eclipse. In the end of 2014, J074548.63+263123.4 was observed on several filters (r′, g′ and KG5′ filters). Those observations shown primary eclipse and SDSS J0745+2631 is confirmed tobe an eclipsing binaries system.
Poster-1 - Board: NUC-06 / 196
Postharvest longevity of Longkong fruits by waxing with Chi- tosan solution and incorporated with gamma irradiation
Author: Soraya RUANGDIT1 Co-author: Tawat Chittakarn 1
1 Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla, THAILAND 90110
Corresponding Author: [email protected]
Since Chitosan is the substance that can be extracted from shrimp shell, easy to find, and cheap in the Southern region of Thailand. In addition, it can prolong the life of fruit after harvest withthe qualification of high cation that can binding to gram-negative bacteria. It can cause bacteria tolose balance in chemistry and eventually die. Moreover, it can also eliminate many types of microor- ganisms. Therefore, this project uses Chitosan solution with the different concentration inorderto prolong the life of Longkong in conjunction with gamma ray, gamma ray can destroy microorgan- isms that are the cause of spoilage of fruit. This experimentation records the result with photography and analyzes the results by Adobe Photoshop Cs6 program by measuring the RGB red spectrum. Be- cause the red spectrum can show a linear correlation between time and spectrum intensity better than green and blue colors. Beside chitosan solution, this experiment also irradiated the Longkong fruit with gamma radiation dose In order to find the concentration of Chitosan solution and doseof Gamma ray that is appropriate to prolong the life of fruit after harvest. The preliminary experiment found that the waxed Longkong with chitosan solution at 0.5%(V/V) in acetic acid 0.5%(V/V) concen- tration can extend the life of Longkong longer than other concentrations and than other Longkongs that are not coated by chitosan solution for 7 days. In the case of gamma irradiation to Longkong, the dosage quantity of gamma ray that used in the experiment is not appropriate for prolonging the life of Longkong because it Dok Mai Si Thong, a similar result is also occurred to the mango fruit that made the mango tissue soft faster than the fruit has not been irradiated.
Poster-1 - Board: SUR-10 / 193
Properties of Sputtered ZnO:Al Film on Flexible Substrates
Author: Pichai Sirisangsawang1 Co-author: Watcharee Rattanasakulthong 2
1 Scientific Equipment Center, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
Aluminum-doped ZnO (ZnO:Al) film was prepared by RF-sputtering on glass, A-PET, C-PET sub- strates. XRD confirms that sputtered ZnO:Al films shows a polycrystalline wurtzite structure with c-axis perpendicular to the substrate in (002) direction. The highest and lowest peak intensities were observed on the films deposited on glass and C-PET substrates, respectively. SEM result shows the
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difference of surface morphology of sputtered ZnO:Al film on A-PET, C-PET substrates. Thefilmon A-PET substrate shows the columnar structure of the oval grain shape whereas the C-PET substrate displays the island structure of the spherical grain shape. EDS also confirms that the atomic per- cent of Zn element of the film on C-PET substrates is slightly higher than that on A-PET substrate. The average transmission in 900-1400 nm of the film on A-PET and C-PET substrates isabout80%. The averaged transmission in visible region of the film on A-PET and C-PET substrates isabout 75% and 80%. It can be concluded that the structure, morphology and optical transmission of sput- tered ZnO:Al film are substrate material dependent and the flexible material can be an appropriate substrate to improve the properties of deposited films.
Poster-1 - Board: ATO-01 / 272
Decay of Hexaaquo Nickel(I) and Zinc(I) Ions in High Tempera- ture Water
Authors: David Bartels1; Kotchaphan Kanjana2
1 Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States 2 Thailand Institute of Nuclear Technology, 16 Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand
Corresponding Author: [email protected]
The decay of the monovalent transition metal ions (Ni+(aq) and Zn+(aq)) in pure water havebeen studied at temperatures up to 300oC using a pulse radiolysis technique with a transient UV-visible detection system. The results indicate that the reactions of the hexaaquo ions with radiolytic ox- idizing species are responsible for this phenomenon. The disportionation nature of the ions has been investigated in aqueous methanol. The kinetics model based on water radiolysis has shown that Ni+(aq) ions do not proportionate. Unlike Ni+(aq), Zn+(aq) ions undergo disproportionation generating metallic zinc with a relatively slow rate. The application of Smoluchowski equation has revealed that all of the reactions investigated are not diffusion-controlled, one exception being the reaction of Ni+(aq) with ●OH radicals at room temperature. The reaction activation energies and the high-temperature optical spectra of Ni+(aq) and Zn+(aq) have been reported.
Poster-1 - Board: PLA-05 / 277
Cold atmospheric pressure plasma diagnostics using an UV-absorption spectroscopy
Author: Yuthana Thana1
Co-author: Dheerawan Boonyawan 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Cold atmospheric pressure plasma consisting of OH, O, O3, NO, and NO2 radicals is currently popular in biomedical applications. This is due to its ability on destroying microbes and stimulating on production of new cells. For such applications, development of techniques to measure density of any radical in the plasma is important. An optical emission spectroscopy (OES) technique, which is used in most laboratories, has a limitation for estimating the radical density on specific area. In this study, we develop a method to use an UV-absorption spectroscopy for measuring the density of the OH, NO, and NO2 radicals on sample surfaces. Study on effect of the atmospheric jet with various conditions is performed. Principle and procedure of the UV-absorption spectroscopy technique as well as the experimental results will be reported and discussed in this contribution.
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Poster-1 - Board: PLA-06 / 278
Characterization of Plasma Conditions for Reactive Pulsed DC Magnetron Sputtering System
Author: Panadda Waruriya1
Co-authors: Prissana Thamboon 2; dheerawan Boonyawan 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University,Huay Kaew Road, Muang District, Chiang Mai, Thailand, 50200 2 Science and Technology Research Institute, Chiang Mai University,Thailand
Corresponding Author: [email protected]
Reactive pulsed dc magnetron sputtering technique is highly effective in thin film deposition, particu- larly thin film of dielectric materials. In this work, we design and set up reactive pulsed dc magnetron sputtering system for deposition of Titanium Nitride (TiN) and Titanium Nitride-Hydroxyapatite (TiN-HA). Suitable plasma conditions for deposition are analyzed using the current-voltage characteristic and optical emission spectroscopy. In this experiment, the pulsing parameters (frequency and duty cycle) and glow discharge parameters (voltage and pressure) are varied.
Poster-1 - Board: ACC-10 / 360
Beam loss monitor system at SPS storage ring
Author: Siriwan Krainara1
Co-authors: George Garnet Hoyes 1; Natthawut Suradet 1; Porntip Sudmuang 1; Prapong Klysubun 1; Sittiporn Taewphet 1
1 Accelerator Technology Division, Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand
Corresponding Author: [email protected]
Siam Photon Source (SPS) storage ring is an electron source with the electron beam energy of 1.2 GeV. In order to better understand behaviors of the electron beam, 50 beam loss monitors (BLMs) have been installed in the SPS storage ring to monitor the electron beam loss signals. BLMs consist of two pin-diodes which are sensitive to the minimum ionizing particles (MIPs) when the electron hits the vacuum chamber. The electron beam loss signals are counted and recorded every second by NI-PXIe system. These results are useful for studying lifetime and stability of the electron beam stored in the SPS storage ring.
Poster-1 - Board: PHO-03 / 302
Optical phase conjugate from cerium doped barium titanate at wavelength 632.8 nm
Author: Knittha Sidakum1
Co-author: Prathan Buranasiri 1
1 Department of Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Page 70 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
In this thesis, optical phase conjugate beam with the using of different resonator configurations has been investigate. Two types of SPPC resonators were selected to use, the first one is linear resonators formed by crystal surface and the other one is linear resonators formed by single mirror and a photorefractive crystal. In our experiment, cerium doped barium titanate crystal3(Ce:BaTiO)and He-Ne laser with wavelength of 632.8 nm have been used. From the results of both cases, the angle of the incident beams is optimum at 37.23 degree and 37.44 degree respect to the normal line of the surface that parallel to the c-axis of the crystal. The generating time of OPC beam are 17 min- utes and 15 minutes for the first and second type resonators, respectively. The reflection ratios are equal to 35.37910% and 0.240%for the first and second type resonators, respectively (the second type resonators could provide better reflection ratio).
Poster-1 - Board: NUC-05 / 95
The Use of SMD-473 as a Potential X-ray Accidental Dosimeter through the Thermoluminescene Properties
Author: Jintana Laopaiboon1 Co-author: Raewat Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchatani University, Ubon Ratchatani, THAILAND 34190
Corresponding Authors: [email protected], [email protected]
In study of emergency dosimeters to be used in case of accidental radiation exposure of the popula- tion, retrospective dosimetry is one of the most important for dose measurement in contaminated areas. In this paper discusses the thermoluminescence (TL) properties of alumina porcelain sub- strates of thin film chip resistors removed from computer circuit boards. X-ray photon energy160 keV was used to irradiate samples in the dose range of 10 to 80 mGy.The results of this work demon- strate that Surface Mount Devices (SMD resistors) can be used as low dose accidental dosimetry, the dose response of the chip resistor is linear from 10 to 80 mGy, proper glow curve peaks, the fad- ing of TL signal remained about 60% even after one month at room temperature and the minimum detectable dose is very low estimated 0.2 mGy.
Poster-1 - Board: ACC-03 / 105
Study and Development of Current Transformers for Measuring of Electron Beam Pulse Current
Author: Pajongjit Naboonmee1 Co-author: Sakhorn Rimjaem 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University 50200
Corresponding Author: [email protected]
Beam diagnostic systems and measuring devices, which are used to verify the beam properties, are essential issues of any particle beam accelerator. In this research, we focus on study and develop- ment of a current transformer for measuring a pulse current of electron beams produced from the radio-frequency (RF) electron gun and from the linear accelerator at the Plasma and Beam Physics Research Facility, Chiang Mai University. The current transformer consists of a ferrite core with high-permeability, a conductor wire wounded around the core forming a secondary coil, and a ter- mination resistor. The electron current that runs through the transformer acts as the current inthe primary coil and it induces an inductance force in the secondary winding. Therefore, the output sig- nal from the secondary winding can be measured and analyzed to be a current value of the electron
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beam. The transformer is mounted over a ceramic insulator inserted in a stainless vacuum chamber to avoid an image current, which may cancel the beam current signal. This study optimizes a number of wounding turns of the secondary coil and the resistance value of the termination resistor as well as the material type of the ferrite core. Optimal parameters of the current transformer are reported and discussed in this contribution. Even though the current transformer is a nondestructive device, the output signal from the transformer may distort due to the decay characteristic of the LR circuit. This feature is, therefore, investigated to obtain the corrected factors, which will be included inthe analysis of the output signal. The final results will provide more accuracy of the measuring value of the electron pulse current. This work has been supported by the CMU Junior Research Fellow- ship Program, and the Department of Physics and Materials Science, Faculty of Science, Chiang Mai University.
Poster-1 - Board: SUR-02 / 32
A study of β-Cu(In,Ga)3Se5 effects on Cu(In,Ga)Se2 thin film solar cells
Author: Boonyaluk Namnuan1 Co-authors: Kajornyod Yoodee 1; Sojiphong Chatraphorn 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Cu(In, Ga)3Se5 is known as a β-phase in the phase diagram of Cu2Se and (In, Ga)2Se3. The exis- tence of this phase on the surface of Cu(In, Ga)Se2 absorber plays an important role for enhancing the performance of Cu(In, Ga)Se2 solar cells. The energy dispersive x-ray spectroscopy (EDX) is used to investigate and confirm the composition of single Cu(In, Ga)3Se5 film and in order to ob- tain the deposition conditions. In this study, the β-Cu(In, Ga)3Se5 with various thicknesses were deposited after a completion of the three-stage co-evaporation process of Cu(In, Ga)Se2 films. The solar cells with thinner Cu(In, Ga)3Se5 showed an increase in open-circuit voltage (Voc). The max- imum Voc of 0.707 V was obtained from Cu(In, Ga)3Se5 film with 10 nm thick. It is noted here that the conversion efficiencies are slightly lower when compared with the standard three-stage growth solar cells without Cu(In, Ga)3Se5. It is mainly due to a decrease in a short circuit current (Jsc) and a fill factor (FF). Based on previous studies, the higher Voc was obtained by a larger energy band gap caused by valence band offset at the CdS/CIGS interface.
Poster-1 - Board: SUR-03 / 34
Influence of thickness reduction for CGS/CIS/CGS absorber layer on solar cell performance
Author: Busarin Noikaew1 Co-authors: Boonyaluk Namnuan 1; Kajornyod Yoodee 1; Sojiphong Chatraphorn 1; Supathat Sukaiem 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Typical CuIn1−xGaxSe2 (CIGS) thin film solar cells on soda-lime glass (SLG) substrates consist ofsix different layers of thin film materials, i.e. SLG/Mo/CIGS/CdS/i-ZnO/ZnO(Al)/Al-grids. One ofthe commonly used deposition techniques for the CIGS thin films is the three-stage deposition process. However, the deposition of CIS/CGS bilayers and CGS/CIS/CGS trilayers were employed for the fabrication of CIGS thin film solar cells in order to reduce the materials and times used in theprocess and induce the non-uniformity of In and Ga due to their different diffusivities that could lead toband gap grading. The substrate temperature was kept constant at 560℃ throughout the deposition. The
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typical thickness of the CIGS was approximately 1.8 μm. The thickness reduction of CGS/CIS/CGS layers was investigated from 1.8 μm down to 0.5 μm. The efficiencies of the devices fabricated from the CIS/CGS and CGS/CIS/CGS layers, both with 1.8 μm thick, showed the maximum value of 12.8 % and 15.5%, respectively. The thickness reduction showed slightly loss in the short-circuit current and the open-circuit voltage resulting in the reduction of the device efficiencies. For example, when the thickness is approximately reduced by 55%, the device efficiency is decreased by 15%. The external quantum efficiency measurements were performed to compare the spectral response of the devices. The cross sectional SEM images of the CIGS devices are shown and compared for their corresponding efficiencies. In addition, XRD and EDS were used to indicate and investigate the non-uniformity distribution of In and Ga in the CIGS absorber layers.
Poster-1 - Board: NUC-10 / 333
Prediction of fusion power in DEMO reactor under various sce- narios using integrated predictive modeling code
Author: Jiraporn PROMPING1 Co-authors: Jatechan Channuie 1; Kampanart SILVA 1; Kotchaphan KANJANA 1; Nopporn POOLYARAT 2; Roppon PICHA 1; Sarinrat WONGLEE 1; Thawatchai ONJUN 3; Thiansin LIAMSUWAN 1; Wannapa BUANGKAM 3; Wichian RATANATONGCHAI 1; Yutthapong PIANROJ 4; sasiphan KHAWEERAT 1
1 Thailand Institute of Nuclear Technology, Bangkok, Thailand, 10900 2 Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, Thailand, 12120 3 School of Manufacturing Systems and Mechanical Engineering, Sirindhorn International Institute of Technology, Pathumthani, Thailand, 12120 4 Faculty of Science and Industrial Technology, Prince of Songkla University Suratthani Campus, Surat Thani, Thailand, 84100
Corresponding Author: [email protected]
In this study, a prediction of the ratio of thermal power output to fusion power input (Q value) of the DEMO reactor under various scenarios using integrated predictive modeling code is studied. DEMO is the first fusion reactor designed to generate electric power, using the knowledge gained from the International Thermonuclear Experimental Reactor (ITER). DEMO has been proposed to be built in various countries, such as Japan, Korea, China, Russia, India, and the EU. In this study, the core transport is described using a combination of neoclassical transport model and anomalous core transport model. The simulations are carried out for plasma temperature and density profiles using the BALDUR code.
Poster-1 - Board: SUR-16 / 332
Fabrication of 3D-hybrid (TNT/Au) Nanoarrays As Substrate for Surface-Enhanced Raman Scattering Detection
Author: Kamon Aiempanakit1 Co-author: Sukittaya Jessadaluk 1
1 Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, 12121, Thailand
Corresponding Author: [email protected]
Surface-enhanced Raman scattering (SERS) substrates have been achieved via simultaneous assem- bled gold nanoparticles (AuNPs) onto the titanium dioxide nanotube (TNT) template. The highly ordered TNT template based on the sputtered Ti thin film was anodized at 60 V 25 oC in ethylene glycol mixed with 0.3 wt% of ammonium fluoride diluted by 2 vol% H2O. The
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effect of HAuCl4 concentration among 0.1 to 1 mM on the Au particle size wasinves- tigated by mean characterization method as field-emission scanning electron microscope (FE-SEM). According to FE-SEM photograph, it clearly observes that the Au particle size gradually increases as the HAuCl4 concentration was increased. Finally, in order to examine the SERs activity the methylene blue (MB) was performed as the probe molecules. The Au particle plays the important role on the SERs performance.
Poster-1 - Board: NUC-07 / 258
Characterization of the New CCD Camera for Neutron Tomogra- phy at the Thai Research Reactor-1/Modification 1
Author: Sarinrat Wonglee1
1 Thailand Institute of Nuclear Technology
Corresponding Author: [email protected]
Neutron tomography is a method to investigate a sample via a three dimensional (3D) image pro- duced by neutron absorption. It is widely applied in many fields such as, medical, industrial and archeological. By reconstructing 2D images taken from different angles, the 3D information can be created. In order to obtain a 2D image of which the quality is good enough for neutron tomog- raphy with a short period of irradiation, a high efficiency neutron camera is needed. The aimof this research is to characterize the new CCD camera for neutron tomography at the Thai Research Reactor-1/Modification 1 (TRR-1/M1). The neutron camera manufactured by NeutronOptics iscom- posed of three main parts: the Kodak KAI-4022 CCD with 2048×2048 pixel resolution, the Nikkor f/1.2 lens with the focal length of 50 mm and the Lithium Fluorine-Zinc Sulphide (LiF-ZnS) scintil- lation screen. The experimental investigation was performed at the radiographic position of100cm from the neutron beam port of TRR-1/M1. Thermal neutron flux at this position is about 10^6 n.cm- 2s-1. At first, the sensitivity indicator (SI) standard sample and the in-house acrylic step wedgewere radiographed to evaluate the sensitivity and the resolution of the camera. Then, the exposure time and the distance were varied to determine appropriate exposure conditions. The obtained images from the new CCD camera were analyzed using ImageJ software. Detailed results and discussion of this investigation will be presented in the manuscript.
Poster-1 - Board: NUC-02 / 63
Measurement of Specific Activities of Natural Radionuclides (40K, 226Ra and 232Th) in Beach Sand Samples from Soisawan Beachof Thepha District in Songkhla Province (Thailand)
Author: MURNEE DAOH1 Co-authors: P. Kessaratikoon 2; RATAIRAT BOONKRONGCHEEP 3
1 Department of Physics, Faculty of Science, Songkhla Rajabhat University, 90000, Thailand 2 Nuclear Physics and Material Physics Research Unit (NuMPRU), Department of Physics, Faculty of Science, Thaksin University, 90000, Thailand 3 Nuclear and Material Physics Research Unit (NuMPRU), Department of Physics, Faculty of Science, Thaksin Univer- sity, 90000, Thailand
Corresponding Author: [email protected]
Specific activity of natural radionuclides (40K, 226Ra and 232Th) in 50 beach sand samples collected from Soisawan beach of Thepha District in Songkhla Province, Thailand, have been measured andan- alyzed. Experimental results were obtained by using a high–purity germanium (HPGe) detector and
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gamma spectrometry analysis system at Nuclear and Material Physics laboratory in Department of Physics, Faculty of Science, Thaksin University, Songkhla Campus. Gamma ray radioactive standard sources 60Co, 137Cs and 133Ba were used to calibrate the measurement system. The KCl and two well-known reference materials (IAEA/RGU-1 and IAEA/RGTh-1) obtained from the International Atomic Energy Agency were also used to analyze and compute the specific activities of 40K, 226Ra and 232Th in every samples. It was found that specific activities ranged from 512.00 – 3955.88Bq/kg for 40K, 20.11 – 83.18 Bq/kg for 226Ra and 3.75 – 94.68 Bq/kg for 232Th with mean values of 1983.32 ± 187.39, 42.67 ± 4.00 and 37.98 ± 2.71 Bq/kg respectively. Furthermore, absorbed dose rate in air (D), radium equivalent activity (Raeq), external hazard index (Hex), and annual effective dose rate of this area were evaluated by using the mean values of specific activities of 40K, 226Ra and 232Th. More- over, the experimental results were also compared with Office of Atoms for Peace (OAP) research data, Thailand and global radioactivity measurement and evaluations.
Poster-1 - Board: MAG-01 / 64
Synthesis and characterization from Zn1-xCoxFe2O4 nanostruc- tures prepared by hydrothermal method
Author: narinthorn Wiriya1
Co-author: Ekaphan Swatsitang 2
1 Department of Material Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
Corresponding Author: [email protected]
In this work, we report the synthesis of ZnxCo1−xFe2O4 nanoparticles (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) prepared by hydrothermal method. The results of XRD, SEM and TEM showed that were cubic spinel structure with the particle size in the range of 7-17 nm. The IR spectra of Zn1−xCoxFe2O4 nanoparticles exposed the intrinsic stretching vibrational modes of the metals at the tetrahedral and octahedral sites. The magnetic properties as measured by VSM indicated that all sample behaved ferromagnetic with saturation magnetization (Ms) and coercivity of 15-52 emu/g and 72-257 Oe, respectively. The XANES spectra were used to identify the oxidation state of Zn, Co andFeions using K-edge profiles by shifts of separate edge. The oxidation state of Zn and Co cations arefound to be +2 and +2,+3 respectively. The Fe2+ and Fe3+ cations are preferable to be at preference for the tetrahedaral and octahedral sites, respectively.
Poster-1 - Board: MAG-02 / 183
Effects of Substrate Materials on Structural and Magnetic Behav- iors of Co-Cu Film Prepared by RF-sputtering
Author: Sirapat Seepromting1
Co-author: Watcharee Rattanasakulthong 1
1 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, Thailand 10900
Corresponding Author: [email protected]
Co-Cu film with thickness of 312 nm on different substrates (glass, A-PET, C-PET, W-PTFEandB- PTFE was deposited by RF-sputtering. XRD confirms that all deposited films show Co (HCP)phase in 220 plane, Cu (FCC) phase in 111 plane and Co-Cu (FCC) phase in 111 plane. Intensity of the peak is obviously dependent on substrate material. The highest and lowest peak intensities were observed on the films deposited on C-PET and A-PET substrate, respectively. VSM result reveals
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that all sputtered Co-Cu films display ferromagnetic phase at room temperature. Themaximum and minimum saturation magnetizations in both parallel and perpendicular measurements were observed on the film deposited on B-PTFE and glass substrates, respectively. The result implies that the structural and magnetic properties of sputtered Co-Cu film can be importantly improved bythe material substrate.
Poster-1 - Board: OPT-04 / 311
Laser Welding with Inert Gas of Various Jewelry Designs
Author: Sukanya Tachatraiphop1
1 School of Laser Technology and Photonics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Corresponding Author: [email protected]
In Jewelry production, the laser welding has become an essential tools. It has been used for repair and upgrading the design. The control parameters which are laser parameters, welding method, inert gas, and operator skills were studies in various jewelry designs both silver and gold. Each jewelry design required different laser parameters and welding methods. Inert gas help improving the appearance of the joint. Moreover, mechanical strength of laser welding was investigate.
Poster-1 - Board: SUR-14 / 315
Surface modification of polysulfone by plasma techniquce
Author: Maytipa Phalakarn1
1 Prience Of Songkla University
Corresponding Author: [email protected]
This project studied on the asymmetric polysulfone (PSF) membranes surfaces were modified byDC plasma at low pressure using argon as working gas in this project. The main objective of this project is to increase the hydrophilic property of the polysulfone (PSF) membrane surface. Samples of asym- metric PSF membrane were modified by DC plasma at low pressure using argon (Ar) as working gas. Plasma process conditions such as treatment time and discharge power were varied. PSF membranes both before and after plasma treatment were characterized by using several analytical techniques. The alteration of hydrophilic property was analyzed through the measurement of contact angle and surface free energy calculation. The surface morphology and structure of PSF membrane was evalu- ated by scanning electron microscope (SEM), while the creation of functional group and the change of mechanical strength were studied by Fourier Transform Infrared Spectroscopy (FTIR) and dynam- ical mechanical thermal analysis (DMTA). Results showed that the hydrophilicity of PSF membrane surface clearly increased after plasma treatment. In addition to the hydrophilic property, theme- chanical properties of PSF membrane surfaces in term of storage modulus were changed and some of functional group may introduce to the plasma treated PSF membranes.
Poster-1 - Board: SUR-08 / 161
Comparison of electrical properties of LaSrCoFe films prepared by suspension and by gel coating method
Author: Shatchai Promsuy1
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1 Department of Physics, Faculty of science, Khon Kaen University, 40002 Khon Kaen, Thailand
Corresponding Author: [email protected]
La0.56Sr0.4Co0.2Fe0.8O3-δ (LSCF) thin films were fabricated on a yttrium stabilized zirconia (YSZ) pellet from either solutions containing LSCF suspension or LSCF sol gels. The suspensions and gel precursors were applied on the substrate via a conventional spraying and a dip coating, respectively. The LSCF films and the YSZ substrates were co-fired at1100 oC. From SEM, the gel-derived films showed a densely-packed structure whilst the films prepared from suspended LSCF did not have such characteristics. The electrochemical impedance spectra unambiguously implied the better film- substrate interface for the gel-derived films as their interfacial resistivities were lower than those prepared by the suspension spray routes.
Poster-1 - Board: AST-08 / 151
Study of pulsation spectrum of primary, rapidly-oscillating mass- accreting component of VV UMa
Author: Khemsinun Gunsriwiwat1
Co-authors: David Mkrtichian 2; Siramas Komonjinda 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand 2 National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
We present the results of photometric study of pulsations in VV UMa Algol-type system as a part of the THASOS (Thai Southern Sky Survey for OEA Stars) survey ongoing at NARIT. The THASOS survey is focused on discoveries of a new oEA stars and detailed study their pulsation spectra and binary light curves. The hot (Te=9540K) primary component of the VV UMa, the0.687355-day Algol type system was discovered and classified as oEA star by Kim et al.2005.The dominant oscillation period of28.6min (50.3c/d) was reported. No further investigations were made in order to study the pulsation spectrum of primary component in the detail. We obtained11nights of new CCD obser- vations of VV UMa with50cm telescope of Thai National Observatory trough V filter during 26Dec 2013 to 23 March 2014. Data were reduced in a standard way relative the comparison stars in order to get light curve. The binary light curves were constructed and pulsational variations in theout- of-eclipse parts were investigated. The Discrete Fourier transform analysis applied to the pulsation light curves revealed multi-periodic spectrum of rapid oscillations with three dominant frequencies of29.47min (48.84c/d),30.628min (47.015159c/d) and 74.09min (19.43c/d). This is a first, detailed inves- tigation of oscillation spectrum of VV UMa, results obtained will be used for development of further strategy of spectroscopic and photometric investigation of mass-transfer and asteroseismic analysis of this binary system.
Poster-1 - Board: AST-09 / 238
Pulsar Search with PMPS Monitoring Dataset
Author: Phrudth Jaroenjittichai1
1 National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand
Corresponding Author: [email protected]
Pulsar search has always been one of the most active fields. It lets astronomers to discover new phenomena, which either challenge or confirm our current knowledge. The most-successful Parkes Multibeam Pulsar Survey (PMPS) has us to discover over a third of currently known pulsars. The
Page 77 Siam Physics Congress 2015 / Book of Abstracts
long-term monitoring programme for PMPS pulsars has been initiated, which now contains over 35,000 observations from 785 sources. The PMPS monitoring dataset is suitable for pulsar search because: 1) the data is recorded in search mode; 2) the 15-arcmin Parkes’ pointing provides a good coverage of the galactic plane. In addition, its timespan of over ten years is also ideal for searching for time-variability and intermittency.
Poster-1 - Board: ATO-02 / 233
Theoretical investigation on the geometrical symmetry and elec- tronic behavior of the three lower members of diamondoids by using first-principles calculations
Author: Nikorn Shinsuphan1 Co-authors: Amornkitbamrung Vittaya 2; Krongsuk Sriprajak 3
1 Materials Science and Nanotechnology program, Faculty of Science, Khon Kaen university, Khon Kaen 40002, Thai- land 2 Department of Physics, Faculty of Science, Khon Kaen university, Khon Kaen 40002, Thailand 3 Department of Physic, Faculty of Science, Khon Kaen university, Khon Kaen 40002, Thailand
Corresponding Author: [email protected]
First-principles calculations have been investigated on the geometrical and electronic properties of the three lower diamondoid structures including adamantane (C10H16), diamantane (C14H20) and triamantane (C18H24) molecules. The energy gap obtained from the difference between the highest occupied (HOMO) and lowest occupied (LUMO) molecular orbital for all three structures decreased with the size of diamondoids increasing. The C10H16 molecule is the most wide band gap (7.22 eV) and that of C14H20 and C18H24 are 6.84 eV and 6.59 eV, respectively. The geometry calculations indicated that the geometrical symmetry of three molecular structures appears to be the Td (tetra- hedral), D3d (Dihedral) and C2v (Cyclic) point groups for C10H16,C14H20 and C18H24, respectively, which implies the high-symmetry structure for the three lower diamondoids.
Poster-1 - Board: ENV-03 / 231
Groundwater investigations in Patiw, Chumphon
Author: Kraipat Petrit1 Co-author: Helmut Dürrast 1
1 Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla, Thailand, 90112
Corresponding Author: [email protected]
Groundwater is important natural resources and vital for many people. In area of Patiw district, Chumphon province has a lot of palm forests. Local people use groundwater for grow their plant. The sedimentary rock in study area consists of mostly mud-gravel sediment rock, siltstone inthe west and mostly hill is limestone. The aim of this project is to find and locate the location ofground- water in Patiw district, Chumphon province by geophysical survey methods. The method use to find and locate groundwater is Electrical survey method. Vertical electrical sounding (VES) surveys were carried out at three locations using Schlumberger array and Imaging electrical surveys (2-D Survey) were carried out at four locations. The field data has been primarily interpreted using in- version. Geophysical model have been prepared based on resistivity profile, geology data and well data. The result shows that there are two groundwater areas, the first area is locate on 160-320m Line 1(2-D) with depth 60-120 m and the second area is locate on 700-1000 m on Line 1(2-D) with depth 50-120 m. The groundwater is water from limestone aquifer. There are two possible drilling
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locations, the first position is locate on 240 m on Line 1(2-D) with depth 90 m and the second position is locate on 900 m on Line 1(2-D) with depth 120 m.
Poster-1 - Board: MAG-05 / 323
Study effects staging time and floor life of epoxy material toreli- ability performance
Author: Singharach JANYOD1
Co-authors: Chalermsak SUMITHPIBUL 2; Kessararat UGSORNRAT 1
1 Department of Industrial Physics and Medical Instrumentation, Faculty of Science, King Mongkut’s University of Technology North Bangkok, THAILAND 10800 2 Engineering Department, UTAC Thai Limited, Bangkok, THAILAND 10260
Corresponding Author: [email protected]
This research interested in studying about property of expired epoxy for extending life time ofthe epoxy in die attach process. Die attach process is one that is very important in the integrated circuit (IC) packaging manufacturing. A normal material used for attaching between die and substrate of a package which is an epoxy. From normal manufacturing process, an epoxy is stored in the frozen at - 40 ℃ and left at room temperature at 25 ℃ for 2 hours. The lifetime of epoxy is 24hours,after that the large quantities of epoxy tubes shall be discarded. For experiment, the two types of expired conductive epoxy is used for die attach process of IC packages by changing the life time from 0,6,12, 18, 24, 30, 36, 42, and 48 hours. For analysis, these packages was tested by viscosity test, die shear test, and moisture sensitivity level test and was observed by scanning electron microscopy (SEM) to analyze properties of epoxy with a life time. The results revealed that possibility to extend the lifetime of epoxy from 24 hours to 30 hours.
Poster-1 - Board: MAG-04 / 321
Effect of post mold cure ramp down temperature on internal pack- age stress for IC plastic packages.
Author: Anan SUKANTHARAT1
Co-authors: Chalermsak SUMITHPIBUL 2; Kessararat UGSORNRAT 3
1 Central Engineering Department, UTAC Thai Limited, Bangkok, THAILAND 10260 2 Engineering Department, UTAC Thai Limited, Bangkok, THAILAND 10260 3 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King’s Mongkut Univer- sity Technology North Bangkok, Bangkok, Thailand 10800
Corresponding Author: [email protected]
This research studied an effect of ramp down temperature to integrated circuit (IC) packages after completed post mold curing in IC packaging process. Post mold cure process is so important to make a completed epoxy molding compound (EMC) due to cross linking to enhance microstructure of com- pound stiffness. Temperature is a factor effect to EMC base on the coefficient of thermal expansion. The ramp down temperature of post mold curing can change microstructure of compound interm of stress inside the package. In experiment, the ramp down temperatures were varied to check the effect of internal stress due to temperature. The ramp down temperature were varied from175C◦ until room temperature (25 C◦) and analyzed the stress inside the packages by reliability testing after take the test samples out from the oven cure. The results showed that for TSSOP package the ramp down temperature at 175 C◦, 150 C◦, 125 C◦, 100 C◦, 75 C◦, 50 C◦ and 25 C◦ to reveal internal stress
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of the package after completed post mold cure. For SOIC and SOT23 the opposite way, theramp down temperature of all these temperatures did not reveal stress inside EMC.
Poster-1 - Board: MAG-06 / 327
Correlation factors of wire sweep between wire bond and mold to establish process design rule
Author: Anocha Sanorit1 Co-authors: Chalermsak SUMITHPIBUL 2; Kessararat UGSORNRAT 1
1 Department of Industrial Physics and Medical Instrumentation, Faculty of Science, King Mongkut’s University of Technology North Bangkok, Bangkok, THAILAND 10800 2 Engineering Department, UTAC Thai Limited, Bangkok, THAILAND 10260
Corresponding Author: [email protected]
The effects of wire sweep within the integrated circuit (IC) packaging process were studied inthis research. Wire sweep is a major criteria that causes the shortage of wire between adjacent areas such as die and mold compound. It occur from the molding process after the wire bonding process in IC assembly. In experiment, the parameters of wire sweep were varied by wire size from 0.7 to 1.0 mil, wire height were varied from 3.0 to 5.0 mil, and in board bond wire length were varied from 10%, 30%, and 50% respectively. The results revealed that the wire height and the inboard wire length were showed directly proportional to wire sweep. In the opposite way, the wire size was showed inversely proportional to wire sweep. Therefore, these parameters of wire were played the important rule in IC packaging process. It should be selected properly for reducing the lot reject rate.
Poster-1 - Board: SUR-15 / 325
Superhydrophobic Surface Modification Based on PTFE Coated AAO Template
Author: Pichet Wongsanarathib1 Co-authors: Attawit Supatti 2; Darinee Phomyothin 1; Mati Horprathum 3; Narathon Khemasiri 1; Penvipha Sat- sanarukkit 4; Pitak Eiamchai 3; Sirapat Pratontep 5; Sukittaya Jessadaluk 6; Sunisa Tongmaha 6; Supanit Pornthree- raphat 7
1 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand 10520 2 Department of Physics, Faculty of Science, Srinakharinwirot University, Bangkok, Thailand 10110 3 Optical Thin-Film Technology Laboratory, National Electronics and Computer Technology Center, Pathumthani, Thailand 12120 4 Nanotec, National Electronics and Computer. Technology Center, Pathumthani, Thailand 12120 5 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520 6 Department of Physics, Faculty of Science and Technology, Thammasat University, Pathumthani, Thailand 12121 7 Photonic Technology Laboratory, National Electronics and Computer Technology Center, Prathumthani, Thailand 12120
Corresponding Author: [email protected]
In this research, the superhydrophobic texture based on PTFE coated AAO template surface modifi- cation. The AAO template was successfully achieved from high purity aluminium sheet by two-step anodization process in 0.3 M of oxalic acid at 40V 0 degree Celsius. The AAO template was then future widened in 5% phosphoric acid at variable period during 0 to 80 min. the effect of widening
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period on pore size was investigated by field-emission scanning electron microscope (FE-SEM). From FE-SEM image illustrates that the pore diameter of the template enlarges as function of widening period. Finally to achieve the extreme superhydrophobic surface, PTFE was sputtered on top of the AAO template through rf magnetron sputtering in 5 min. Regarding with the static contact angle, the superhydrophobic performance increasingly improve.
Poster-1 - Board: OPT-05 / 204
Phase imaging of cancer cell using compressive sensing apply to digital holography
Authors: Chantira Boonsri1; Prathan Buranasiri1
Co-authors: Suwan Plaipichit 2; Thanyarat Thong-on 1
1 Department of Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 2 Department of Applied Physics, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Corresponding Author: [email protected]
The aim of this research is to develop a quantitative phase imaging system based on digital hologra- phy for distinguishing cancer cells and ordinary cells. For improving the efficiency of the imaging system, a computer program, which has been used for digital hologram reconstruction, is modified by integrating with an algorithm based on compressive sensing theorem. The feature of compressive sensing algorithm is the ability of recovery signals from the sparsity of sampling signals. Therefore, the phase imaging system with compressive sensing algorithm is providing an accurate cancer cell reconstruction from a relative small number of encoded signal sample cells.
Poster-1 - Board: SUR-06 / 76
Optical property of titanium-doped ZnO thin film prepared using dc magnetron sputtering technique
Author: Lukkana Srisoy1
Co-authors: Artit Chingsungnoen 1; Phitsanu Poolcharuansin 1
1 Department of Physics, Faculty of Science, Mahasarakham University, Mahasarakham, THAILAND
Corresponding Author: [email protected]
In this research, the ceramic target with a mixture of ZnO (99.9% purity) and titanium (99.99% pu- rity) was sintered at 1,000 ◦C for 4 hour. The content of Ti added to the ZnO target 10 wt.%.The diameter of the target was 51 mm and the thickness was 5 mm. The titanium-doped ZnO (TZO) films were deposited on glass substrates using the DC magnetron sputtering at room temperature. The deposition time was varied from 30 min to 90 min with the sputtering power of 150 W. When the deposition time of 30 min, the TZO film has the lowest sheet resistance of 72.2 /sq corresponding to the thickness of TZO films (determined using SEM image) of 1.2 m. The visible transmittance increased above 90% with the deposition time of 75 min corresponding to the optical energy gap of 3.87 eV which obtained using the Tauc plot method.
Poster-1 - Board: NUC-03 / 74
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Measurement of Specific Activity of Natural (40K, 226Ra and 232Th) and Anthropogenic (137Cs) Radionuclides in Bottled Drinking Wa- ter in Phuket Province (Thailand) Using Gamma Ray Spectrome- try Technique
Author: Auttachai Thawonsuwan1
Co-authors: P. Kessaratikoon 2; S. Benjakul 2; Saina Jeasai 2
1 Faculty of General Education, Rajamangala University of Technology Srivijaya, A. Muang, Songkhla, 90000, Thailand 2 Nuclear and Material Physics Research Unit (NuMPRU), Department of Physics, Faculty of Science, Thaksin Univer- sity, A. Muang, Songkhla, 90000, Thailand
Corresponding Author: [email protected]
This research aims to study the specific activity of natural (40K, 226Ra and 232Th) and anthropogenic (137Cs) radionuclides in bottled drinking water from different manufacturers in local stores located in Phuket province, Thailand. Totally 30 samples of bottled drinking water (5 liters) were randomly collected and prepared. All of water samples were boiled at 100 oC and evaporated into 1 liter. Specific activity of natural and anthropogenic radionuclides in all prepared water samples were measured and determined using a low background high-purity germanium (HPGe) detector and gamma ray spectrometry analysis system. The gamma ray radioactive standard sources from Office of Atoms for Peace (OAP) which is SH-424, were also used to analyze and compute all of specific activities of 40K, 226Ra, 232Th and 137Cs. The measuring time of each sample is 21,600 seconds. It was found that specific activities of 40K, 226Ra, 232Th and 137Cs ranged from < 0.20 - 0.41 Bq/L, 0.37 - 2.11 Bq/L, < 0.11 - 1.30 Bq/L and < 0.27 - 1.82 Bq/L with mean values of 0.24 ± 0.09 Bq/L , 1.13 ± 0.2 Bq/L, 0.61 ± 0.21 Bq/L and 1.09 ± 0.36 Bq/L, respectively. Moreover, the experimental results were also compared with Office of Atoms for Peace (OAP) research data and some acceptable values proposed by UNSCEAR.
Poster-1 - Board: ACC-08 / 358
SLRI Beam Test Facility Development Project
Author: Kritsada Kittimanapun1
Co-authors: Kreukrit Sittisart 1; Narong Chanlek 1; Nawin Juntong 1; Prapong Klysubun 1; Sampart Cheedket 1; Siriwan Krainara 1; Siriyaporn Sangaroon 2
1 Synchrotron Light Research Institute (SLRI), 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand 2 Faculty of Science, Mahasarakham University, Khamriang, Kantharawichai, Mahasarakham, 44150, Thailand
Corresponding Author: [email protected]
The SLRI Beam Test Facility (SLRI BTF), currently in a design phase, is a part of the future upgradesof the SLRI accelerator complex. Upon completion, SLRI BTF will be able to produce electron test beams with the number of electrons ranging from a few tens to several thousands of electrons per bunch. A simple setup in the initial stage will be implemented without any modifications to the existing high energy beam transport line (HBT), while additional elements are required for the short-term setup. For a permanent station, a newly dedicated transfer line equipped with an energy selector will be constructed to extract the electron beam from the HBT beam line. This project aims to provide a defined number of electrons in a required range of electron energy for calibration and testing ofhigh energy detectors as well as other beam diagnostic instrumentations.
Poster-1 - Board: ACC-09 / 359
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Pressure distribution of the SPS storage ring
Author: Prapaiwan Sunwong1 Co-authors: Anusorn Tong-on 1; Nawin Juntong 1; Supan Boonsuya 1
1 Accelerator Technology Division, Synchrotron Light Research Institute (Public Organization) 111 University Avenue, Muang District, Nakhon Ratchasima, 30000 Thailand
Corresponding Author: [email protected]
Ultra-high vacuum is a key requirement that determines electron beam quality and lifetime for an electron accelerator complex. In operation of the Siam Photon Source (SPS), pressure distribution of storage ring has been monitored using a series of Cold Cathode Gauges (CCGs) installed in proxim- ity to the vacuum pumps around the ring. Pressure between the CCGs was calculated based on the continuity principle of gas flow. Photon-stimulated gas desorption from synchrotron radiation was also taken into account. It was found that averaged pressure of the SPS storage ring is ≤1.0×10−9 Torr, calculated at the beam current of 115 mA, the beam energy of 1.2 GeV and the photon dose of 2000 A⋅hr. Discussion will be made on the calculation results in comparison to the measured values. In addition, the latest results from three-dimensional simulation using Molflow will be pre- sented.
Poster-2 - Board: EDU-37 / 317
Smartphone in teaching Physics
Author: Pokonwong Suthichon1 Co-author: Pornrat Wattanakasiwich 1
1 Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Authors: [email protected], [email protected]
This paper aimed to review literatures about how mobile phone is implemented in teaching physics from more than twenties papers in journals with a section on physics teaching such as Physics Education, European Journal of Physics, The Physics Teacher, American Journal of Physics, etc. In the past few years, technology of smart mobile phones has changed the way we lives and also are going to change the way we, as physics educators, teach. In this paper, a use of the smartphone for teaching physics was divided into five categories, according to applications (Apps). Firstly, the applications are used as a voting system. Secondly, the applications worked with built in sensors are for using as data collection instruments. Thirdly, the applications are for viewing teaching videos. Fourthly, the applications are used as a way for an instructor to communicate with students outside of the classroom. Fifthly, the applications with interactive simulation are used for students tolearn from physics simulations or games. Examples of each category are given and discussed their possible implications for teaching physics.
Poster-2 - Board: BIO-02 / 274
Analysis of Biological Effect inside Human Body Exposed toEx- tremely Low Frequency due to Overhead Transmission Lines
Author: Apichart Siriwitpreecha1 Co-author: Phadungsak Rattanadecho 2
1 Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut’s Univer- sity of Technology North Bangkok, Bangkok 10800, Thailand
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2 Department of Mechanical Engineering, Faculty of Engineering, Thammasat University, Pathumthani 12120, Thai- land
Corresponding Author: [email protected]
In Thailand, the extra high voltage 500 kV and 50 Hz overhead transmission lines have been installed by Electricity Generating Authority of Thailand (EGAT) both of single-circuit and double-circuit due to the rapid increasing of electrical power demands. The electromagnetic field will be generated and propagated to the environment in the area around overhead transmission lines. The intensity of electric field and magnetic field are proportional to the voltage of transmission lines. There isconcern about the harmful effects on human which is exposed to electromagnetic field due to these overhead transmission lines. The biological effect on human body in case of high voltage and extremely low frequency electric field is induced current density. Some human organs, such as hearts and brains, are able to function by utilizing weak electricity. There may be some harmful effects to these organs if the current density exceeds the safety limit. The safety limit values of electric field and current density were set by the International Commission of Non Ionizing Radiation Protection (ICNIRP), electric field is 5 kV/m and current density is2 µA/m2 for general public exposure. In this work, the numerical analysis base on Finite Element Method is used to calculate the electric field intensity around overhead transmission lines and induced current density on human body standing under overhead transmission lines. Therefore, the induced current density on several organs such as lungs, heart, liver and intestine inside human body exposed to extremely low frequency electromagnetic field at 13 positions under single-circuit overhead transmission lines are investigated. These values will be compared to the safety limits. It is found that the incident electric field on human body and induced current density on some organs inside human body are higher than those of the safety limits for general public exposure, especially the body at mid-span of the tower.
Poster-2 - Board: EDU-18 / 109
Development of Portable Desk Lab for High School and Univer- sity Physics
Author: Wachira Seesad1
Co-authors: Saichol Pimmongkol 1; Sura Wuttiprom 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND
Corresponding Author: [email protected]
The senior project aimed to develop a series of experimental apparatus for use in teaching andlearn- ing physics in high school and university courses. Each apparatus is miniaturized to about a fifth of conventional one, built on a small steel plate of B5 size. Therefore, it is portable and can be placed on a classroom desk. Each set is constructed by a number of parts divided according to their functions, and some of them are interchangeably useable in other experiments. This saves material, cost, and space. The sets are flexible enough so that they can be modified for other purposes bytheuserac- cording to his (or her) own idea. In the first phase of this study, the experiments relevant diffraction of light, this equipment evaluates the interference effect of light after passing through a narrow sin- gle slit, and refraction of light, this equipment shows the refraction of light phenomena by which a ray of light changes direction (bending effect of light) when it passes from one transparent material (an optical medium) into another of light was developed.
Poster-2 - Board: EDU-03 / 19
Simulation and Experimental Study of Vibration Characteristics of Thai Traditional Brass Gong
Author: Jatuporn Thongsri1
Page 84 Siam Physics Congress 2015 / Book of Abstracts
Co-author: Thitinan Chantramontol 2
1 College of Data Storage Innovation, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand, 10520 2 Manufacturing System Engineering Program, College of Data Storage Innovation, King Mongkut’s Institute of Tech- nology Ladkrabang, Bangkok, Thailand, 10520
Corresponding Author: [email protected]
In this study, the vibration characteristics of Thai traditional brass gong were numerically inves- tigated based on finite element method (FEM) in three dimensions. We presented a methodology, boundary conditions and other parameters, which are important to be set. Preliminary results of simulation show set of natural frequencies and the corresponding mode shapes that were compared with the experimental results. It was found that both results are in good agreement. The most useful impact of this study is a simplified model in laboratory for helping to understand concept of physics and mechanical vibration.
Poster-2 - Board: EDU-08 / 27
Surveying Students’ Conceptual Knowledge of Fluid Mechanics
Author: Mana Chatmontree1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
Over the last 30 years, physics education research revealed that students already have a number of ideas about how physical systems behave, even before they start to study physics. In many cases, these ideas differ from accepted scientific ideas. Other research showed that it is difficult forstu- dents to change their initial ideas and found that traditional instruction is relatively ineffective in correcting these misconceptions or in helping students develop a more appropriate way of thinking. Users of the peer instruction technique discovered learning gains above the level of traditional peda- gogies and consistent with interactive engagement. Thus, a low-cost experimental set incorporated with peer instruction about fluid mechanics was developed. Before implementation of this tool, stu- dents’ conceptual knowledge was assessed by a 15 item two-tier test. The test was classified into four sub-topics, density, buoyant force, Archimedes’ principle, and Bernoulli’s principle. The mean scores before the implementation were 10.34, 39.41, 16.09 and 28.74 respectively.
Poster-2 - Board: CON-09 / 248
The Role of Core Hole Effects on Calculated Resonant Inelastic X-Ray Scattering Spectra of Graphene
Author: Nuchalee Schwertfager1
Co-authors: Liang Zhang 2; Sukit Limpijumnong 1; Walter Lambrecht 3
1 School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree Uni- versity of Technology, Nakhon Ratchasima 30000, Thailand; Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok 10400, Thailand 2 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 3 Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106-7079, USA
Page 85 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
The electronic band structure of graphene was calculated using the full-potential linearized muffin- tin orbital (FP-LMTO) method. Its resonant inelastic x-ray scattering (RIXS) spectra at various x-ray excitation energies were calculated based on Kramers-Heisenberg equation. It is found that the RIXS spectra show distinct dispersive features and are interpreted as being due to the conservation of crystal momentum during the RIXS process. However, the shift between XAS and XES energy scales due to the presence or absence of the core hole in the final state of these two processes, respec- tively, has to be taken into account, in order to obtain an optimal agreement between the simulated and experimental RIXS spectral. This shift is consistent with the observed changes in calculated PDOS induced by the presence of the core hole.
Poster-2 - Board: EDU-17 / 106
Simple Thick Lens Made of a Bottle Filled with Liquid
Author: Kittipoom Mala1
Co-author: Pornrat Wattanakasiwich 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thai- land; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
This study aimed to calculate and to determine experimentally a focal length of a simple thicklens. The thick lens made of a round-bottom bottle (flask) completely filled with transparent liquid(such as water or oil). Four different sizes of a round-bottom flask including 100, 250, 500 ml and1000 ml were used to change the diameter of thick lens. The focal length of thick lens was calculated using ray transfer matrices and substituting values of bottle thickness, outer radius, inner radius and refractive index of the filled liquid. The calculated value of focal length was then compared with the measured value from setting up a simple experiment. This simple thick lens can beusedto demonstrate basic to advanced concepts of geometrical optics.
Poster-2 - Board: CON-02 / 114
Stability Diagram of a Serial Quantum Dot System
Author: Angkhan Intanin1
Co-author: Prathan Srivilai 1
1 Department of Physics, Faculty of Science, Mahasarakham University, THAILAND 44150
Corresponding Author: [email protected]
We present a new method to construct a stability diagram of a serial quantum dot system. The partition function and average charge numbers of the system were calculated by means of imaginary- time path integrals. Consequently, the stability diagram for the quantum dot system was obtained by projecting the average charge numbers of the system to the gate voltage-phase space. To verify the method, stability diagrams for the triple quantum dot systems were calculated. The diagrams allow the quadruple points and positions in which quantum cellular automata processes occur to be determined.
Page 86 Siam Physics Congress 2015 / Book of Abstracts
Poster-2 - Board: CON-11 / 262
High pressure properties of I-III-VI2 compounds from ab initio calculation
Author: Sukanya Petchsirivej1
Co-authors: Prayoonsak Pluengphon 1; Thiti Bovornratanaraks 2
1 Division of Physical Science, Faculty of Science and Technology, Huachiew Chalermprakiet University, Samutprakarn 10540, Thailand 2 Extreme Conditions Physics Research Laboratory, Department of Physics, Faculty of Science, Chulalongkorn Univer- sity, Bangkok 10330, Thailand
Corresponding Author: [email protected]
Ab initio calculation based on density functional theory were performed for studying high-pressure phases and electronic properties of I-III-VI2 compounds. Thermodynamic properties of a solid sys- tem were calculated by using LDA and PBE functionals. Stability of high pressure structures of I-III-VI2 compounds were determined by comparing the lowest enthalpies. The high-pressure prop- erties such as lattice parameter, electron density and elastic constant were investigated upto200 GPa. Stability of high pressure structures were observed by studying the phonon dispersion rela- tion.
Poster-2 - Board: BIO-05 / 334
Study of Butea superba. Roxb Root (Red Kwao Krua) Extract on Sex Reversal of Nile Tilapia by using Exponential Decay Pulse- Electric Fields
Author: Sakshin Bunthawin1
Co-authors: Kata Jaruwongrungsee 2; Thanyada Sornsilpa 1
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand 2 Nanoelectronics and MEMS Laboratory, National Electronics and Computer Technology Center (NECTEC), Na- tional Science and Technology Development Agency (NSTDA), Ministry of Science and Technology (MOST), Pathumthani 12120, Thailand
Corresponding Author: [email protected]
The present study employs exponential decay pulse-electric field inductions to enhance sex reversal of Nile tilapia eggs in suspensions for monosex-male. The novel technique was the pilot study to initiate the usage of natural androgen hormone of Butea superba (Red Kwao Krua) extract instead of our previous electroporation medium of 17α - methyltestosterone (MT). The eggs of Nile tilapia obtained from our parent breeding stocks were carefully selected for inducement in pulse electric field strengths of 0.25- 87.50− kV.m 1 generated between narrow plate electrodes. Electric fields of 3-5 exponential decay pulses of 5-100 µs durations were applied to optimize egg’s electroporation. The prototype of the electrode equipped with the sequential signal pulse-generator (SPG) for on-site inductions was fabricated which could induce ≈ 50 eggs/SPG unit at one time. The electroporation medium (EPM) was prepared using HEPES buffer with a minimized concentration of the androgen hormone, Butea superba. Roxb Root (Red Kwao Krua, RKK) extract. Only minimal volumes (50 ml) of buffered MT medium were required. The electroporation of induced membrane pores were observed by determination of pore sizes and pore densities through SEM micrographs. After the process of sex reversal, induced eggs were grown up to frysizes big enough (2 months old) to verify sex reversal. This novel technique reduced the RKK dose down to a minimized value of1,500 µg.l−1 and achieved a 69.14% male: female sex ratio.
Page 87 Siam Physics Congress 2015 / Book of Abstracts
Poster-2 - Board: CON-06 / 182
Ga acceptors in SnO2 revisited: A hybrid functional study
Author: Nirawith Palakawong1 Co-authors: Jiraroj T-Thienprasert 2; Shengbai Zhang 3; Sukit Limpijumnong 1; Yiyang Sun 3
1 School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree Uni- versity of Technology, Nakhon Ratchasima 30000, Thailand; Thailand Center of Excellence in Physics, Commis- sion on Higher Education, Bangkok 10400, Thailand 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand 3 Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
Corresponding Author: [email protected]
SnO2 is an oxide semiconductor with wide band gap, good transparency, and high thermal and chem- ical resistances. As-grown SnO2 usually exhibits n-type conductivity with high carrier concentra- tions, which is an obstacle to make it p-type. Consequently, applications of SnO2 for optoelectronics are limited. Group-III elements, such as Al, Ga, and In, are candidates to give p-type conductivity when substituting for Sn in SnO2. Earlier calculations suggested that the calculated results of these dopants can be shallow or deep depending on the computational details, i.e., the result based on HSE calculations [Phys. Rev. B 79, 245206 (2009)] showed that they are shallow acceptors, on the other hand, PBE0 calculations [J. Mater. Chem. 22, 25236 (2012)] showed that they are all deep. In this work, the possibility of making p-type SnO2 by Ga was revisited using the HSE functional. Our results show that the acceptor level of GaSn is actually deep. Therefore, Ga can only serve as com- pensating acceptor but not a p-type dopant for SnO2. This conclusion does not change even after the alloying of SnO2 with Si (SixSn1−xO2 where x ∼ 0.17) to introduce a compressive strain.
Poster-2 - Board: CON-01 / 94
Calculation of Average Charge Number on the Single Electron Transistor by Quantum Monte Carlo Method
Author: Tawan Thongsuk1 Co-author: Prathan Srivilai 1
1 Theoretical Condensed Matter Physics Research Unit, Department of Physics, Faculty of Science, Mahasarakham University, Maha Sarakham, THAILAND 44150
Corresponding Author: [email protected]
The average charge number on the metallic single electron transistor due to the effect ofCoulomb Blockade and Electron Tunneling at any temperature is calculated by using path integral Monte Carlo (PIMC) approaches. The results show that those effects are the most prominent at low temperatures, i.e. βEC > 1. Additionally, the efficiencies of the Single Site Update Algorithm (SSU) andFast Fourier Transform Algorithm (FFT) techniques are compared. We found that the FFT technique needed significantly less processing time that SSU method. In essence, the processing timeofthe FFT technique was approximately 38% of that of the SSU method.
Poster-2 - Board: INS-07 / 216
Classification of arabica by electronic tongue
Author: Aant Phatthara-aneksin1
Page 88 Siam Physics Congress 2015 / Book of Abstracts
Co-authors: Chaleeda Borompichaichartkul 2; Fareeya Kulapichitr 2; Inthawoot Suppavorasatit 2; Kannapon Lopetcharat 3; Sirapat Pratontep 1; Thanawee Chod arusawad 1; Vittachai Yuwaphan 1
1 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand 2 Department of Food Technology, Faculty of Science, Chulalongkorn University, Payathai, Bangkok 10330, Thailand 3 Nouveau Centric Co. Ltd, 55 soi Jadsanuahwattanasakul 19/4 Pattanakan Rd. Suanluang, Suanluang, Bangkok 10250,Thailand
Corresponding Author: [email protected]
An electronic tongue (e-tongue) represents a class of machines that are able to classify liquid samples, e.g. food and beverages, usually from various electrochemical methodology in combination with pattern classification and recognition analyses. This research aims to classify Arabica coffeeby using an in-house electrochemical based on cyclic voltammetry and principal component analysis (PCA). Arabica coffee samples include green coffee beans and roast coffee beans of different grades from Pahee, Chiang Rai province. The coffee beans were ground and brewed following the cup test methods. The solutions were then measured and classified by the e-tongue. The results showthat the e-tongue classifies the differences of the coffee samples from the most significant totheleastas follows: brewing methods, the degree of roast, and lastly the grade or the origin of coffee. The results will be compared with human sensory tests (total = 30). This research demonstrates the potential of the e-tongue as a rapid and low method for quality control of coffee.
Poster-2 - Board: EDU-31 / 237
The Development Of Scientific Concept of “Momentum AndRe- garding Collision” For Grade 10th Students Though Leaning Ac- tivities Based On The Predict-Observe-Explain (POE) Method
Author: Kanita Srithanee1
Co-authors: Chaiyapong Ruangsuwan 2; Patana Puwanich 2
1 Division of Science Education, Faculty of Education, Khon Kaen University, Khon Kaen 40002, Thailand 2 Departmaent of Physics, Faculty of science, Khon Kaen University, Khon Kaen 40002, Thailand
Corresponding Author: [email protected]
The purpose of this research was to develop scientific concepts of momentum and collision forgrade 10th students though Predict-Observe-Explain (POE) leaning activities. There were 34 grade 10 stu- dents of Roi-Et Wittayalai School, during the second semester of academic year 2014 (November 2014 – March 2015) participated this study. There were two research tools were used in this study. Firstly, experimental tool that consisting of 6 POE lesson plans. Secondly, data collection tool con- sisting of multiple choice test for investigating students’ understanding of the scientific concept of momentum and collision which was used for examining the student both pre-test and post-test. The pre-test results performed that most of the students contained partial conceptual understanding while some students represented alternative concepts. In contrast, the post-test shown that the num- ber of misconception students was decreased and most of them performed good science conceptual understanding.
Poster-2 - Board: BIO-11 / 346
Transport of Macromolecules through Glomerular Basement Mem- brane
Author: Panadda Dechadilok1
Page 89 Siam Physics Congress 2015 / Book of Abstracts
Co-author: Numpong Punyaratabandhu 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Payathai Rd., Pathumwan, Bangkok, 10330 Thailand
Corresponding Author: [email protected]
The main function of human kidneys is to filter blood and remove metabolic waste while retaining the normal blood composition and volume. The first step of this process is blood filtration through the glomerular capillary wall, which consists of multiple layers: endothelium cell layer, the glomeru- lar basement membrane (GBM) and the epithelial foot processes with their interconnecting slit di- aphragm. A hydrodynamic model is introduced to describe hindered transport of electrically neutral macromolecules through the slit diaphragm and the glomerular basement membrane (GBM). The glomerular basement membrane is modeled as an isotropic fibrous medium, where as the epithelial slit is modeled as a row of parallel cylindrical fibers, and the dimensionless flow resistance iscal- culated using finite element method. The non-uniform cylinder spacing is assumed to followthe gamma distribution. The mean value of the spacing and its standard deviation are calculated from the experimentally obtained hydraulic permeability using the Newton-Raphson’s method. The av- eraged sieving coefficient is calculated by using those distribution functions and is compared with the total sieving coefficient of Ficoll from experiments.
Poster-2 - Board: EDU-05 / 22
Designing an Inquiry-based Learning Approach about Force and Pressure to Enhance Elementary Students’ Critical Thinking Skills
Author: Pannaporn Duangkam1
Co-author: Udom Tipparach 1
1 Department of physics, Faculty of Science, Ubon Ratchathani University, Thailand 34190
Corresponding Author: [email protected]
The purposes of this one group pre-/post-test research were to design an inquiry-based learning approach about force and pressure based on the 80/80 efficiency criterion, and to enhance students’ critical thinking skills. The participants were 25 purposively selected grade five students from Pond- uan School, Wang-Hin, Srisaket in the first semester of the 2014 academic year. The results indicated that the overall quality of the inquiry-based learning approach was at the highest level. The effi- ciency regarding the standardized criteria E1/E2 was 81.06/80.66. The participants were also asked to complete a critical thinking skills test and its results showed that the mean post-test score was significantly higher than the mean pre-test score at the statistical level of.05.
Poster-2 - Board: BIO-04 / 326
Development of 68Ga-peptide for Positron Emission Tomography Tracer
Author: Piriya Kaeopookum1
Co-authors: SARINYA WONGSANIT 1; SUWIMOL JETAWATTANA 1; WIRANEE SRIWIENG 1
1 Research and Development Division, Thailand Institute of Nuclear Technology (Public Organization), Nakhonnayok, THAILAND 26120
Page 90 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
Bombesin peptide is crucial for the development of positron emission tomography (PET) tracer for human prostate cancer. The aim of this work is to optimize the labeling condition of Ga-68with DOTA-[Pro1,Tyr4]-bombesin, an analog of bombesin peptide, through in vitro and in vivo studies. It was found that the radiolabeled product 68Ga-DOTA-[Pro1,Tyr4]-bombesin was obtained in high radiochemical purity, ≥98%, without further purification. The results of in vitro stability study of radi- olabeled compound in phosphate buffered saline, ferric chloride solution and human serum showed that 68Ga-DOTA-[Pro1,Tyr4]-bombesin was stable for 2 hours. In vitro evaluation of radiolabeled peptide affinity to GRP receptors was performed by a competitive cell-binding assay inthehuman 125 4 68 prostate cancer cell line PC-3 with I-[Tyr ]-bombesin as radiolabel. The calculated IC50 of Ga- DOTA-[Pro1,Tyr4]-bombesin with PC-3 cells using GraphPad Prism was in the range of 36-123 nM 68 1 4 with the best IC50 of 66 nM. The uptake of Ga-DOTA-[Pro ,Tyr ]-bombesin from biodistribution study in tumor-bearing nude mice was 3 times higher in tumor than in muscle tissue at 2h post injection.
Poster-2 - Board: EDU-15 / 61
Comparisons of Students’ Responses Relating to Buoyancy Force Between Two Different Teaching Approaches
Author: Pawaret Intana1
Co-author: udom Tipparach 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
There is wide agreement among physics education researchers that practical work is of goal impor- tance for teaching and learning and allows for the promotion of several education goals. However in Thailand, teaching and learning approach was focusing on lecturing rather than laboratory. The research aim to compare the gain of learning achieved using two different instructional approaches under controlled conditions. The comparison was made between two group (N=39 and N=36) of grade 10 at Rajaprachanugrough 28, Yasothon province. First group done the experiment before lecturing and second group done the lecture before experimenting. Analysis of students’ task and diagnostic test results will be presented.
Poster-2 - Board: EDU-21 / 154
Teaching strategies to facilitate students’ use of mathematics when solving physics problems
Author: Putcharapong Prawai1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, Ubon Ratchathani University, Thailand, 34190
Corresponding Author: [email protected]
The complexity of physics has implications for the teaching of physics today. That physicsisa very complex subject is shown from the research on problem solving and misconceptions that has dominated the field during the past 30 years. It is commonly known that students have difficulty for solving physics problems because of mathematic skill. In this study 120 high school physics students were given a set of pure math problems and a set of physics problems that require them to use the same mathematical processes. Presented here are the preliminary results that show a strong
Page 91 Siam Physics Congress 2015 / Book of Abstracts
positive relationship between math and physics scores. We also introduce the teaching strategies that facilitate students’ use of mathematics when solving physics problems.
Poster-2 - Board: EDU-01 / 14
Using a Terminal Block as a Protoboard for the Development of Concepts related to Simple Direct Current Circuits
Author: Phusit Juntana1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
A protoboard is a thin plastic board used to hold electronic components such as resisters, transistors, and chips that are wired together, and is used to construct prototypes of electronic circuits. Although a protoboard is an appropriate tool for simply testing a prototype circuit or hooking up a quick exper- iment, it is difficult for students to use because they become confused about the connection pattern of the join holes along the horizontal and vertical lines and the differences between a real circuit constructed on a protoboard and a schematic diagram in a textbook. This study used a terminal block as a protoboard and involved 30 students in grade 11 in the second semester of the academic year 2014 at Loeipittayakom School, Amphur Muangloei, Loei province. The research tools consisted of an experimental kit, lesson plans using the predict-observe-explain technique, and the Interpreting Resistive Electric Circuit Concepts Test (DIRECT). Data were analyzed by t-test and normalized gain. Results showed that the mean post-test score was significantly higher than the mean pre-test score at a statistical level of .01. The average class normalized gain was at the medium gain level (0.35). The study illustrated that a terminal block can be used to develop students’ concepts.
Poster-2 - Board: CON-12 / 312
A Second-Quantization Approach to the Analytical Faraday Ef- fect in Graphene
Author: Phusit Nualpijit1
Co-author: Sooty Boonchui 1
1 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
We investigate coherent single photon traveling in the positive z direction passes through a graphene film subjected to a transverse magnetic field B. Analytical expressions are obtained for the trans- mission and reflection coefficients by full second-quantized form. Giant Faraday rotations inthe infrared regime are generated and measurable Faraday rotation angles in the visible range become possible. For an example, this explains the departure from the semiclassical value for θF observed in the right panel in B ≈ 1 T for ¯hω = 10 meV (B ≈ 0.5 T for ¯hω = 30 meV). If the magnetic field intensity is higher than a given value, we necessarily have NF = 0 (for 0.05 eV this value is about 1.9 T). In this case, the Hall conductivity at T = 0 is fully determined by a single type of interband −4 transition, and assuming E1(B) ≫ ¯hω, we obtain θF ≈ 3 × 10 .
Poster-2 - Board: EDU-19 / 129
Page 92 Siam Physics Congress 2015 / Book of Abstracts
Thermodynamics of a Rubber Balloon
Author: Piimonpun Prasongsri1
Co-author: Pornrat Wattanakasiwich 1
1 Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
This study aimed to investigate thermodynamic properties of a rubber balloon including hysteresis and cooling effect of a deflated balloon. Firstly, pressure inside a balloon was measured usinga Vernier pressure sensor and plotted as a function of the balloon averaged radius. Well-known math- ematical models of inflated balloon including Mooney-Rivlin, Ogden and Gent-Gent models were used to fit experimental data. Secondly, hysteresis of pressure-stretch curve was investigated andit was found to depend on a turnaround radius. Thirdly, surface temperature of the balloon was inves- tigated by using a Vernier surface temperature sensor. As a result when the balloon was deflated, temperature could decrease more than 5ºC depending on the initial radius and balloon thickness. These results can be used to develop teaching materials or demonstrations for an introductory or advanced thermodynamics course.
Poster-2 - Board: EDU-33 / 254
Investigation of Students’ Moral Reasoning in Learning Physics Laboratory
Author: Dontohleb Rosonlah1
Co-author: Pornrat Wattanakasiwich 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thai- land; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
This study aimed to investigate moral reasoning of the first year students in physics laboratory. An instrument used in this study was 10 open-end questions. Each question corresponded to different aspects of moral reasoning such as integrity, diligence, discipline etc. The questions were given to 10 experience physics teachers and 100 first-year engineering students taking physics laboratory. Stu- dents took twenty minutes to finish the questionnaire. Teachers and students responses were rated into three levels including high, medium and low level of moral reasoning. As a result, students had lower level of model reasoning when compared with teachers. Most student responses were rated to be at medium to low level on questions about integrity, discipline, harmony and morality.
Poster-2 - Board: BIO-09 / 338
Sequential Signal Generator for Yeast Separations
Author: Sakshin Bunthawin1
Co-authors: Adisorn Tuantranont 2; Kata Jaruwongrungsee 2
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand
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2 Nanoelectronics and MEMS Laboratory, National Electronics and Computer Technology Center (NECTEC), Na- tional Science and Technology Development Agency (NSTDA), Ministry of Science and Technology (MOST), Pathumthani 12120, Thailand
Corresponding Author: [email protected]
The multiple-parallel plate electrode equipped with a sequential signal generator (SSG) (to be patented) has been developed for on-site yeast separations in the brewery industry. Dead and living yeast cells were separated by using non-uniform sinusoidal electric fields. The SSG was developed from our pre- vious lab-scale version to produce a sinusoidal phase to generate out-of-phase electric fields for on- site operation with ranging frequency of 1 kHz-1 MHz and the output voltage range of 1-30Vpp. The phase difference addressing on the opposite electrodes are fixed as π radian and its phase sequence can automatically be altered and circulated within interval time of 30 seconds (changed by a step of 0.01-30 second). Experimental results showed that living yeast cells of the brewery company exposed in the electric field strength ranged from 14 to 143− kV.m 1 exhibited positive dielectrophoresis (cells attach to the electrodes) at the lower critical frequencies between 81.00-89.00 kHz (the optimized −1 frequency was 82.43 kHz) if the medium conductivity (σs) was between 0.01-0.30 S.m . These elec- trical conditions imply that yeasts being translated to the tip of electrodes were living cells. Percent yield of positive dielectrophoresis can be employed to evaluate the number either living or dead cells quantitatively. Moreover, the value of the lower critical frequency was shifted towards greater values when σs was increased. The spectra of both positive dielectrophoresis of the living and dead cells were different resulting in difference of cells dielectric properties i.e. the conductivity of the yeast cytoplasm (σc) of the dead cell was less than that of the living yeast cells (typically, the living cell has a cytoplasmic conductivity of about 0.2 S.m−1).
Poster-2 - Board: CON-13 / 340
Electronic band structure of Hydrazine-water doped Single-Walled Carbon Nanotubes as n-Type Semiconductor
Author: sittipong KOMIN1 Co-authors: Wutthisak Prachamon 2; sukit LIMPIJUMNONG 2
1 Department of Physics, Faculty of Science, Ubonratchathani University, Ubon Ratchathani 34190, Thailand 2 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Corresponding Author: [email protected]
We have studied the electronic band structure of single-walled carbon nanotubes (SWCNTs), (8,0) 3 primitive cells 96 carbon (C) atoms doped with hydrazine (N2H4) and water (H2O). Van der Waals corrected density functional theory calculations using plane wave approach with periodic boundary conditions were carried out for the adsorption of the intermolecular interaction. The results indicate that hydrazine physisorbs to the surface of SWCNTs and carbon atoms still retains the formal sp2 hybridization. Furthermore, the electronic structures and Bader charge analysis of the considered complex reveal the band gap of intrinsic semiconductor changed from 0.6 to 0.4 eV, as n-type semi- conductor. The configuration of hydrazine and water, hydrogen bonding network supported, are important key to occur donor state in physisorption doping process.
Poster-2 - Board: EDU-23 / 205
An Effective Hands-On Experiment in Light and Optics for Grade 10 Students
Author: Sujitra Khuntee1 Co-author: Sura Wuttiprom 2
Page 94 Siam Physics Congress 2015 / Book of Abstracts
1 [email protected] 2 urn:Facebook
Corresponding Author: [email protected]
This research aimed to develop and implement a set of hands-on experiment in light and optics.The subjects were 38 tenth grade students in an extended high school of Supanburi province on academic year 2014. The instruments used were a set of hands-on experiment in light and optics, the Lightand Optics Conceptual Evaluation (LOCE) test, and student experiment’s report. The data were analyzed by calculating average, standard deviation, t-test and average normalized gain. The result indicate that the students’ conceptual understanding of the light and optics were higher in posttest than those in pretest (p< .05). The average class normalized gain was at the medium gain level (g =0.67). The study illustrated that a hands-on experiment is effective and can be used to develop students’ concepts.
Poster-2 - Board: EDU-13 / 54
Developing concept of a frictional force by using predict-observe- explain (POE) technique
Author: Anek Hongthong1 Co-author: Udom Tipparach 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
We have learned from our experience of teaching physics that students misunderstand about the concept of a frictional force. The objective of this work is to enhance the students’ understanding on the concept of a frictional force for grade 10 students of Chaiyaphumbhakdeechumphon school, Chaiyaphum province. The research tools consist of the teaching plan with predict-observe-explain (POE) technique, experiment sets, and conceptual tests on the frictional force. The data analysis of pretest and posttest using t-test and normalized gain will be disused.
Poster-2 - Board: EDU-28 / 229
The development of scientific concepts on motion in uniform field of grade 10 students through Predict-Observe-Explain (POE) with video demonstration.
Author: Thoedsak Nachampa1 Co-authors: Chaiyapong Ruangsuwan 2; Wiwat Youngdee 2
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
This research was aimed to study and enhance the students’ concepts on motion in uniformfield through Predict-Observe-Explain (POE) by using video demonstration. There were 29 grade 10 stu- dents, second semester of academic year 2014, Nareenukun School Office of Secondary Education Service Area 29. This research was performed in qualitative research designed. There were three main research tools used. Firstly, 6 lesson plans (total 12 hours) on motion in uniform field. Secondly, the evaluation tools consisting of a learning management’s journal and a teaching observation form. Finally, Force Concept Inventory Diagnostic Test by Eric Mazur (Pearson Prentice Hall, 1997), Thai
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version. The results shown that the students had alternative conceptions in the direction andmagni- tude of motion in uniform field and observing data was interpreted soon after each learning activity finished. It was found that students had developed their alternative concepts to scientific concepts after participarting the POE with video demonstrations.
Poster-2 - Board: EDU-26 / 226
The development of scientific concept on electrostatics of grade 11 student through Predict – Observe – Explain (POE)
Author: Mateeya Martjun1
Co-authors: Chaiyapong Ruangsuwan 2; Patana Puwanich 2
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
This research was aimed to study and enhance the students’ concepts on electrostatics byusing Predicts-Observe-Explain approached. There were 45 grade 11 students, second semester ofaca- demic year 2014 (November 2014-March 2015), Roi-Et Wittayalai School Office of Secondary Edu- cation Service Area 27, participated this study. This research was performed in qualitative research designed. There were two main research tools used. Firstly, 6 lesson plans (total 12 hours) onelec- trostatics. Secondly, evaluation tools, 20 questions with two-tier multiple choices. The response from both student and observer were interpreted soon after each learning activity finished. Itwas found that the pre-test of students showed their partial misconception for 37.20% of total students and 62.79% total misconception. After finished Predicts-Observe-Explain approached, post-test per- formed that student had perfectly the correct for 62.22% while 37.77% still remained some misconcep- tions on electrostatics. It could be concluded that students had developed their alternative concepts to scientific concepts on electrostatics.
Poster-2 - Board: HEP-03 / 305
Effect of water vapour on neutron detection of cosmic rays
Author: Supawit Kittipadakul1
Co-authors: David Ruffolo 2; Kritpong Kulthamrongsri 1; Thawatchai Sudjai 1; Wattanapol Sangpho 1
1 Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom, 73170, Thailand 2 Space Physics and Energetic Particles Group, Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand
Corresponding Authors: [email protected], [email protected], [email protected]
Cosmic rays play an important role in our daily lives and can be used in various fields of educational research, especially in physics and astrophysics. However, the detection of cosmic rays is affected by many factors, and atmospheric water vapour pressure was recently suspected to be an important factor. Princess Sirindhorn Neutron Monitor (PSNM) is a cosmic ray detector in Chiangmai, and the count rate of nearby bare counters relative to PSNM showed a strong anti-correlation with atmo- spheric water vapour pressure data. It is not clear whether this anti-correlation is a direct effect of water vapour or an indirect effect due to water accumulation on concrete around PSNM. Such ananti- correlation was, therefore, searched with the count rate from a bare neutron counter (MicroMonitor) at Mahidol University in Bangkok. MicroMonitor is in a building; the indirect effect should not be found, but a direct effect would be. Raw count rate and atmospheric pressure data from several years of MicroMonitor operation were processed, normalised with the pressure-corrected PSNM
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count rate and searched for a correlation with atmospheric water vapour pressure data at Bangkok. The results were compared with those for PSNM. The neutron detection data at Mahidol University were found that they fluctuate much less and do not exhibit a direct effect of atmospheric water vapour. Consequently, it was concluded that the neutrons detected by bare counters can be indi- rectly affected by atmospheric water vapour as a proxy for accumulated water which absorbslow energy neutrons.
Poster-2 - Board: CON-07 / 206
Crystal and electronic structures of Li2Ti6O13 for lithium-ion bat- teries
Author: Jarin Kanchanawarin1 Co-authors: Adisak Boonchun 1; Klichchupong Dabsamut 1
1 Department of physics, Kasetsart University, Bangkok 10900, Thailand
Corresponding Author: [email protected]
The valuable non-renewable resources such as petroleum and natural gas will gradually peter outin near future, therefore alternative sources of energy are becoming of increasing interest. Moreover, in order to store energy, rechargeable lithium batteries are of particular interest since they havea possibility for portability and together with a high conversion efficiency. Hexa-titanium oxide based materials, such as Na2Ti6O13, K2Ti6O13 or Li2Ti6O13, have been intensively investigated because of their potential applications as electrodes for ion-exchange batteries. By means of first-principles calculations, we study the electronic structure of Li2Ti6O13, which has been experimentally shown as one of possible materials for a cathode in lithium-ion batteries. We have obtained the crystal structure of Li2Ti6O13 and Ti6O13, which Ti6O13 was not completely determined experimentally. The overall lattice parameter are quite good agreement with experimental. Our calculated bandgap of Li2Ti6O13 is 2.92 eV when a general gradient approximation (GGA) functional were used, while the experimental band gap is 3.5 eV. The electronic band dispersion reveals that the both electron and hole mobility are low. The capability to store energy can be expressed in term of intercalation voltage. Our computational average intercalation voltages are 2.08 Volt with GGA-PBE functional and 1.78 Volt with HSE Hybrid functional. Our calculation are found to be in excellent agreement with experiments of 1.70 Volt.
Poster-2 - Board: HEP-02 / 256
Comments on holographic star and the dual QGP
Author: Piyabut Burikham1 Co-author: Tossaporn Chullaphan 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand
Corresponding Author: [email protected]
We study static AdS star in generic dimension. The dependence of the mass limit to the bulk fermion mass is explored. In the bulk conformal limit, the mass limit saturates at a value identical to the mass limit of a radiation star or the AdS space filling with pure radiation. The temperature and entropy of the degenerate AdS star in the bulk conformal limit is zero in contrast to the radiation star. Holographically, the universal mass limit corresponds to the upper limit of the deconfinement temperature in the dual gauge picture. The QGP at this temperature is dual to the large blackhole and the heat capacity is positive. When the fermion mass increases, the mass limit falls into the range of the small black holes. We found that even though the small black hole has negative heat capacity, the AdS box allows possibilities that it remains in thermal equilibrium with the radiation as
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long as the size of the black hole is not smaller than a critical size. Consequently, the dual QGP with negative heat capacity can be produced and remains stable thermodynamically at temperature below a saturation temperature T2. The QGP with negative heat capacity produced at higher temperature will still condensate completely into a gas of confined hadron.
Poster-2 - Board: EDU-30 / 235
To design learning activities for the interference and the diffrac- tion of light by using the learning package coorperate STAD tech- niqe : a case of secondary high school.
Author: Sumana Aungplachai1
Co-author: Saengkrit Klunboot 1
1 Department of Physics, Faculty of science, King Mongkut’s University of technology Thonburi , Bangkok ,THAILAND 10140
Corresponding Author: [email protected]
The objective of this study was designed the effective learning activities for studying in the interfer- ence and diffraction patterns of light. The learning package of the interference and the diffractionof light (LPID) were used with the cooperative learning, Student Teams-Achievement Divisions (STAD) technique, for the secondary high school students. LPID was designed that consists of the adjustable width single slit and double-slit two laser light sources (red, green) and acrylic box, that can be flow the smoke. The interference and the diffraction patterns were observed. The expectations ofstudy in learning physics were investigated by Maryland Physics Expectations (MPEX) and the assess- ment for learning was observed by normalized gain. Research has shown results of this learning package.
Poster-2 - Board: EDU-11 / 49
Cambodian Students Understanding of Forces and Motions: A Comparison with US, Australian, Japanese and Thai students
Author: Seng Khun Beang1
Co-author: suttida rakkapao 1
1 Department of Physics, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, THAILAND 90110
Corresponding Author: [email protected]
This research aims to explore Cambodian students’ understanding of forces and motions usingthe force and motion conceptual evaluation (FMCE) test. The 43 items of FMCE, excluding an energy concept, were translated into Cambodian language, validated by experts, and modified to reach a statistically acceptable version. After that, the assessment instrument was applied to 73 tenth graders of a medium- sized school located in the central region of Cambodia. These students have learn the forces and motions via a lecture-based conventional teaching method. Results showed some students’ misconceptions, for examples, around 70% of these students believed that for a moving object, a force is always in a direction of its velocity. They also claimed that an acceleration is proportional to a velocity. Moreover, most believed that during an interaction of two objects, the object of the greater mass (or velocity) can exert the greater force to the other. A cluster of Newton’s 1st and 2nd laws was the most problem of these Cambodian students. When we analyzed four sets of questions in this cluster, it revealed that the coin toss and the cart on ramp contexts were the most difficult questions of the students. Moreover, when we compared the results of Cambodian students with published FMCE results collected from US, Australian, Japanese and
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Thai students, we found a very similar trend of students’ ideas. This preliminary outcome willbe used as a primary resource to design instructional media for Cambodian students in a following part of our research.
Poster-2 - Board: EDU-27 / 228
Using colour light mixer cooperate with CIPPA model to teach primary colour light and their mixed: A case of secondary high school students.
Author: Rapeepat SONKRUA1
Co-author: Saengkrit KLUNBOOT 1
1 Department of Physics, Faculty of science, King Mongkut’s University of technology Thonburi , Bangkok ,THAILAND 10140
Corresponding Author: [email protected]
The teaching technique about the understanding for colour light and their mixed that used thecolour light mixer together with CIPPA model was presented in this study. The colour light mixer was made from three Light Emitting Diode (LED) e.g., red , green and blue. Our colour light mixercan be generate a smooth and clear colour and can be control light intensity. For the teaching technique the CIPPA model was used to teach girl students for secondary high school cooperate with the colour light mixer. The understanding for primary colour light and their mixed was determined byusing the normalized gain.
Poster-2 - Board: CON-03 / 138
Structural phase transition of binary compounds of TlX (X = N, P, As) under high pressure : An ab initio Study
Author: Kittipong Limchuchua1
Co-authors: Komsilp Kotmool 2; Pornmongkol Jimlim 2; Prutthipong TSUPPAYAKORN-AEK 3; Thiti Bovornrata- naraks 3
1 Mahidol Wittayanusorn School, Nakhon Pathom 73170, Thailand 2 Department of Physics, Mahidol Wittayanusorn School, Nakhon Pathom 73170, Thailand 3 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
Corresponding Author: [email protected]
In this work, density functional theory (DFT) has been performed to investigate high-pressure phase transitions of TlX (X = N, P, As). Both standard GGA and LDA functionals with norm-conserving pseudopotential are used to compare each other in recent work which the calculation results are reported in form GGA (LDA). Based on the previous theoretical predictions, B3-to-B1 (B4-to-B1 for TlN) are reinvestigated initially, as well as the other candidates with crystal structure of Cmcm, P4/mmm, Cmmm, and B2-type structure are undertaken for comparing energetically to predict the high-pressure phases in these compounds. It reveals that TlN and TlP transform to B1 at 19 (16) and 28 (10) GPa, by compressing B4 and B3, respectively. The reduction volumes are approximately 14.8 (15.2) % and 14.7 (16.4) % for TlN and TlP, respectively. Moreover, B2-type is predicted at 340 (395) GPa for TlN, and at 97.5 (81) GPa for TlP with passing through P4/mmm. In TlAs, B3-type structure does not undergoes to B1-type. But it could possibly transform to Cmcm and Cmmm structure at which is different with previous predictions.
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Poster-2 - Board: EDU-16 / 93
Developing Analysis Skills about electrical DC circuit by Virtual board on Ohm’s law
Author: Panya Wichanphet1
Co-author: Choksin Tanahoung 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
This study aimed to developing analysis Skills and solving a problem about electrical circuit.In the time, Learning of students to attend on examination of University. Teaching in mostly schools emphasized theory but knowledge in physics must study from learning by doing for foundation in future. In this research, the participants were attending students level as grade 12. There were 35 students one group. The first, experiment have used examination of multiple choices 12 articles about DC circuits which is developed by Paula V. Engelhardt and Robert J. Beichner North Carolina State University Department of Physics . The result was found that 88.57 percentage from 35 students through the target 60 percentage of full marks. And practical tests by learners used project board appear that 35 students through the target 60 percentage of full marks 0 percentage. Consequently the student must practice with virtual electronic board then test again. The pretest posttest group design was used in carrying out the study. The data of experiment were analyzed t-test and normalized gain. The result shows that statistically significant mean differences between the pre-test and post-test at significant level of .01 and average normalized gain was in medium gain (0.55). Thus this virtual board can be used efficiently as a learning tool for students to enlightentheir understanding in DC circuit.
Poster-2 - Board: EDU-07 / 25
Application of Role-playing Game Strategies in Teaching and Learn- ing High School Physics
Author: ratapon kamkaen1
Co-author: choksin tanahoung 1
1 Department of physics, Faculty of Science, Ubon Ratchathani University, Thailand, 34190
Corresponding Author: [email protected]
The National Statistical Office reported that persons between 15 and 24 years used the internetmore than other groups, with 65.4% of their time being spent playing online games, especially role-playing games (RPG). Examples of RPG are Ragnarok and Dungeons and Dragons. A RPG is a game in which each participant assumes the role of a character generally in a fantasy or science fiction setting that can interact within the game’s imaginary world. RPG is a type of cooperative game play that pro- motes creativity and teamwork specifically. The use of RPG in the classroom has become accepted by educators. In this research, the prominent characteristics of RPG were applied into the design of teaching and learning sequences that involved the completion of missions such as solving prob- lems, quests, and conversations, and teaching others. The participants in the study were 29 grade 10 students in grade ten in Srisaket province. Results showed a strong positive relationship between students’ experience levels and achievement scores after application of RPG Strategies in teaching and learning. Therefore, it can be concluded that the teaching and learning sequences wereeffec- tive.
Poster-2 - Board: EDU-04 / 20
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Applying the Michael and Wittmann’s Framework to Analysis of the Force and Motion Conceptual Evaluation Test
Author: Suriya Chalermchat1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, Ubon Ratchathani University, Thailand, 34190
Corresponding Author: [email protected]
In the last three decades, much work has been done regarding the identification of students’ mis- conceptions in fundamental physics, especially related to the topic of force and motion. Many of these misconceptions are widely shared and re-appear in different groups of students. For example, many students believe that the net force on an object is proportional to its velocity rather than its acceleration, an object with a larger initial speed exerts more force than an object with a smaller ini- tial speed during a collision, and heavier objects exert more force than lighter ones. It has also been shown that traditional instruction is relatively ineffective in correcting these misconceptions orin helping students develop more appropriate ways of thinking. In this research the active teaching and learning modules in the force and motion concept section were designed and implemented into a high school classroom in Kalasin province. The students’ conceptions before and after teaching were assessed with the Force and Motion Conceptual Evaluation test (FMCE). The results found that only a small percentage of high students grasped Newtonian concepts.
Poster-2 - Board: EDU-06 / 23
Using Active Workbooks as a Tool to Develop Concepts and Problem- solving Skills in Work and Energy
Author: Lanjakorn Tongrueng1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand 34190
Corresponding Author: [email protected]
This research aimed to develop students’ conceptual understanding and problem-solving skills in work and energy work using active workbooks. These workbooks were prepared in advance by the teacher and consisted of essential concepts, ideas, diagrams, graphs, problems, and conclusions. The participants in the research were 23 grade 10 students at Khiansaphittakom School, AmphurKhainsa, SuratThani province in the second semester of the 2014 academic year. The research tools consisted of active workbooks,lesson plans based on the predict-observe-explain technique, the Work and Energy Evaluation, Test and the eval- uating learners’ satisfaction. The results of the study demonstrated a significant increase in student learning performance both concepts and problem solving skills with the application of the active workbooks and the targeted groups were satisfied by using active workbooks.
Poster-2 - Board: EDU-25 / 223
The Development of Concepts of Grade 11 Students on Resistor Circuit Through Predict-Observe-Explain (POE) Approach
Author: Yupaporn Jarearnkhat1
Co-authors: Chaiyapong Ruangsuwan 2; Patana Puwanich 2
Page 101 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
This study was qualitative research aimed to improve conceptual understanding of grade 11stu- dents on resistor circuit through Predict-Observe-Explain (POE) approach. There were 34 grade 11 students those studied in the second semester of academic year 2014 (November 2014 to March 2015) in Strisuksa School, the Secondary Educational Service Area 27, Roi-Et province, participated this study. There were two categories research tools had been used in this study. Firstly, Predict-Observe- Explain (POE) approach lesson plan. Secondly, a set of the evaluation tool, scientific concepts test, two-tier multiple choice diagnostic test. The collected pre-test data were analyzed for investigating students’ background knowledge to be used in lesson plan designing and the post-test was done soon after the POE finished. The findings revealed that student’ scientific concepts in prior intervention by POE approach in resistor circuit could be interpreted into various categories and the majority of them were diverged from scientific concepts about connecting light bulbs in series and parallel, con- necting resistors in series and parallel. After learning through POE approach, it found that students’ concepts generally were according to scientific concepts. It could be concluded that the students understanding could be developed toward scientific concepts by using POE approach.
Poster-2 - Board: EDU-35 / 283
Applying Michelson Interferometer for Coherence Length Mea- surement of Laser Light
Author: Pornchai Kopatta1
1 Department of Physics , Mahidol Wittayanusorn School , Thailand
Corresponding Author: [email protected]
In this work, a Michelson Interferometer was applied for the measurement of coherence length of He-Ne laser (632.8 nm), blue diode laser (404.5 nm), green diode laser (532.5 nm) and red diode laser (656.5 nm). The principle of coherence length measurement is based on the formation of interference fringes obtained from Michelson interferometer. The laser beam is expanded by a beam expander and passes into Michelson interferometer. The laser beam is divided into two beams byabeam splitter. The two beams, are reflected at mirror M1 and M2, and then interferes to form interference fringes as can be seen by the eye. The Michelson interferometer can be used to measure coherence length of laser light directly by measuring the maximum path difference over which we still observe the interference fringe. The coherence length of He-Ne laser (632.8 nm), blue diode laser (404.5 nm), green diode laser (532.5 nm) and red diode laser (656.5 nm) are found to be 0.85, 0.18, 0.3 and 0.45 mm, respectively. The results are in good agreement with those of theoretical calculations, i.e. 0.8, 0.16, 0.28 and 0.43 mm.
Poster-2 - Board: BIO-12 / 349
Enhancement of oil Palm (Elaeis guineensis Jacq.) by Magneti- cally treated Water
Author: Chadapust Sudsiri1 Co-authors: Sasitorn Uaysin 1; Sirinart Naprasit 2
1 Faculty of Science and Industrial Technology, Prince of Songkla University, Surat thani Campus, Surat thanni, 84100, Thailand 2 Facculty of Science and Industrial Technology, Prince of Songkla University, Surat thani Campus, Surat thanni, 84100, Thailand
Page 102 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
Oil palm planting has become a very important agriculture especially in Southern Thailand. Because its oil production has been used as human consumption and is now developed as bio-energy used for some vehicles therefore oil palm has become a very important economical plant which has been promoted to crop widely. However, since a nursing time of young oil palm trees needs more than 2 years, rare of young oil palm trees which caused high price has still caused a problem to agriculturist. In addition, some young trees weak and unable to grow. This work we therefore present physics method to enhance oil palm seedling. Magnetically treated water (MTW) was applied to young oil palm nursery. Oil palm seedlings which were electromagnetically germinated were divided into two groups and transferred into soil pot with same basic nutrition. Both groups were planted at nature environments. Light intensity at 1200 Lux was controlled. The first group was watered every day by MTW whereas the second group was applied by normal water and act as control. Sprout Heights of both groups were daily recorded. We found that oil palm seedlings which were watered by MTW grew 3 times faster than control with a growing rate of 0.31 cm/day. Larger and longer leafs than those of control also were observed. Our results conclude that MTW is able to stimulate plants growth and reduce their nursing time.
Poster-2 - Board: INS-05 / 121
Creation of 3D information from 2D images
Author: Apiram TEERANAVAGUM1
Co-author: Ratchapak CHITAREE 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
The objective of this study is to use the internal and external parameters of calibrated camerato correctly reconstruct 3D information from 2D images. Calibration of camera is necessary for ap- plications that involve quantitative measurements such as dimensional measurements, depth from stereoscopy, or motion from images. The depth of a point can extract from 2D images by the method of triangulation. In this presentation, the method and principle of camera calibration and 3D recon- struction are discussed demonstrated. The technique offers an alternative solution for 3D creation from 2D images.
Poster-2 - Board: INS-06 / 125
A Study of Capacitively Coupled Contactless Conductivity Detec- tion (C4D) Electrode Configurations on Signal Detection Sensitiv- ity
Author: Korkuson Masean1
Co-authors: Jongrak Sanglao 1; Nirut Pussadee 2
1 Department of Physics and Materials Science, Faculty of science,Chiang Mai University, Chiang Mai, 50200, Thailand 2 Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of science ,Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
Capacitively Coupled Contactless Conductivity Detection (C4D) technique has been widely used in detecting particles of interest in microfluidics applications. In this technique, change of solution con- ductivity is detected when particles in solution flow pass electrodes. Detection sensitivity depends
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on electrodes and microfluidic channel configuration. Influenced electrode geometries include elec- trode dimensions, detection area, and thickness of the wall separating electrodes and the channel. Various sizes and shapes of C4D electrodes fabricated using printed circuit board patterning tech- nique and arrangements between electrodes and channel were used in determining detection sensi- tivity when particular particles in solution pass through. The sizes of the electrodes fabricated for this study were 50, 90, and 150 microns. The C4D electrodes were tested with the various oil droplet sizes in water. It was found that the electrodes could be used to detect the oil droplets of size down to about 100 microns.
Poster-2 - Board: EDU-34 / 264
Development of light detector for Michelson Interferometer ex- periment Instrument
Author: Chanoknan Banglieng1 Co-authors: Busayakorn Na-ranong 1; Janthanee Authisin 1; Ratchaneerom Manayingcharoen 1; Sarawut Jaiyen 1
1 Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110
Corresponding Author: [email protected]
We developed a supplement instrument for Michelson Interferometer experiment instrument. In this experiment, we have to count numbers of fringes to determine wavelength of He-Ne laser. Without this extra instrument, the counting is hard and easy to make error because the fringes are very small. This instrument serves as light counting device. It composes of light sensor, comparable circuit, microcontroller and LCD panel. This device is designed to count only high intensity light and specific wavelength (600-1,000 nm). When there is a constructive fringe pass the light sensor, this device will count the fringes. We found that using this device can improve experiment results compared to using only by eyes. We calculated the wavelength of He-Ne laser to be 669.2 nm which was only 0.18% error. This device is a part of interactive multimedia for advance physics lab. This researchwas supported by Rajamangala University of Technology Thanyaburi Research Fund.
Poster-2 - Board: EDU-14 / 58
Surveying of high-school students’ ability in drawing free-body diagrams
Author: Rathaphol Yooyued1 Co-authors: Kwan Arayathanitkul 1; Narumon Emarat 1
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
There are various strategies for solving physics problems in mechanics. Each strategy containspar- ticular steps that are appropriate for particular topics in mechanics. One of the most important steps in almost all strategies is drawing a free-body diagram (FBD). It is an essential skill students must have in order to solve physics problems successfully. In this study, we conducted a survey of high-school students’ ability in drawing FBD. A set of questions was given to a group of grade-12 students from various schools who have already learned how to draw FBD. They were asked to draw all vectors of forces acting on an object in different situations, including a stationary object placed on another stationary or moving object or on an inclined plane as well as an object moving with constant velocity or acceleration. We found from the survey that most of the students could not draw all the FBD correctly. It was quite a surprise that they had difficulties in drawing a correct
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direction of an object’s weight as well as “normal” forces due to other objects. We will show in the presentation students’ skill in drawing FBD as well as their alternative understanding of forces act- ing on an object. This research will be further used to develop instructional strategy for enhancing high-school students in such skill.
Poster-2 - Board: EDU-12 / 53
Pre-Service Physics Teachers Expectations in Learning Physics
Author: Singha Prasitpong1
1 Faculty of Education, Thaksin University, 140 Kanchanawanit Rd., Meuang Songkhla District, Songkhla 90000
Corresponding Author: [email protected]
The purpose of this study is to explore the learning expectation of 127 pre-service physics teachers from faculty of education, Thaksin University. The assessment instrument is a 34-item Likert-scale of the Maryland Physics Expectations (MPEX) survey, which consists of 6 clusters namely indepen- dence, coherent, content, reality link, math link and effort. Students ‘responses to the survey were rated the agreement as either favorable or unfavorable with the experts points of view. Results showed that students’ expectations of reality link cluster is the most similar ideas to the experts. In contrast, the most different expectations between students and experts was in the content clus- ter.
Poster-2 - Board: BIO-03 / 309
Carbon screen-printed electrode/Graphene-PEDOT:PSS/Prussian blue/PEDOT-AuNPs for electrochemical immunosensor applica- tion.
Author: Zunpitch Kwanyuen1 Co-authors: Amornpun Sereemaspun 2; Kanitha Patarakul 2; Seeroong Prichanont 3
1 Department of Biomedical Engineering, Chulalongkorn University 2 Faculty of Medicine, Chulalongkorn University 3 Department of Chemical Engineering, Chulalongkorn University
Corresponding Author: [email protected]
Fast, reliable, inexpensive, and efficient pathogen detection for diagnostic purposes has always been a high priority in healthcare industry, leading to research for alternative diagnostic methods. An approach that is prominent and has all said characteristics is electrochemical-based immunosen- sors. Recently, Graphene has gained a lot of interest in electricity-related fields due to its high electri- cal conductivity and other favorable properties, which could increase electrochemical response as well. The objective of this work is to develop graphene-based carbon screen-printed electrode for immunosensing. Initially, Graphene-Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (GR-PEDOT:PSS) was drop-coated on the surface of carbon screen-printed electrodes. Prussian blue nanoparticles were subsequently electrodeposited as the redox mediator. The electrodes may be drop-coated with GR- PEDOT:PSS and electrodeposited with Prussian blue again, creating different number of layers. Fi- nally, gold nanoparticles (AuNPs) conjugated PEDOT polymer was drop-coated on the modified
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electrode to both promote electron transfer and act as base material for further protein immobiliza- tion via ionic bonding. The materials utilized substantially enhanced electrochemical current response, indicating possible synergistic effects. Afterward, the modified electrodes were incubated with Staphylococcal Protein A and subsequently IgG antibodies. The results obtained indicate successful deposition of both Protein A and IgG antibodies onthe fabricated electrodes, which deemed this fabrication method promising for creating label-free point- of-care diagnostic immunosensors.
Poster-2 - Board: EDU-36 / 300
Automatic Marking System for Basic Physics Laboratory
Author: Noparit Jinuntuya1
1 Department of Physics, Faculty of Science, Kasetsart University, Jatujak, Bangkok 10900, Thailand
Corresponding Author: [email protected]
We have developed a system that can automatically give a score to a student laboratory report. Even the system can be used in general, we aim our work mainly to the basic physics laboratory. We take the advantage of the existing Google doc by designing a cloud document for the students to submit their reports. This can be very convenient since the students can submit their worksvia any platforms of their smart devices. The reports are kept in the form of spreadsheet, which canbe analysed by the macro langauge like VBA or Openoffice.org BASIC. The score is given base onthe discrepacy of the results reported by the students and the values from the sensors. We use the single board Raspberry Pi as our workstation to analyse the reports by comparing with the experimental values. As a prototype, we connect our Pi with the camera module to create a motion tracker, which we use to track the motion of objects or reading the dial indicator. By using the free-of-charge cloud document and the tiny, but powerful, Raspberry Pi workstation, our system is not so pricely and very suitable for the large laboratory classes. We expect that this should help the instructor of the basic laboratory in their tedious but very importance jobs. Our system should also reduce the bias from the different instructors and gives a fair check to the student reports
Poster-2 - Board: HEP-01 / 247
Search for the Standard Model Higgs boson in ZZ* to 4μ decay channel with the CMS experiment at √s = 8 TeV
Author: Teerapat Payupol1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330 , Thailand
Corresponding Author: [email protected]
A search for standard model Higgs boson is performed by analyzing the data from proton-proton collision recorded by the CMS experiment at center-of-mass energy of 8 TeV. The data is saved in the form of ROOT files. In this project, the data already have been reconstructed, identified andisolated physics objects such as electrons, muons, photons, etc. Then various properties of these physics objects are studied for optimization of a typical analysis in accord with various decay modes. This project use ‘muons’ for studying the distribution of important physics parameters, e.g. transverse momentum, geometrical acceptance, relative isolation, invariant mass of four muons.
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Poster-2 - Board: INS-01 / 38
Preliminary Investigation of Heat Transfer and Thermal Distri- bution in Computer Mainboard based on Finite Element Analy- sis
Author: Jatuporn Thongsri1 Co-authors: Ittiwat Meesap 2; Tossapol Rattanapongwisut 2
1 College of Data Storage Innovation, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand, 10520 2 Undergraduate student in Manufacturing System Engineering Program, College of Data Storage Innovation King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand, 10520
Corresponding Authors: [email protected], [email protected]
A Higher operating temperature increases a risk of mainboard in computer malfunction. In this work, the heat transfer and thermal distribution on a mainboard were investigated based on finite element analysis. We proposed boundary conditions and parameters at least to be defined. The results of simulation were compared with the actual results measured by the thermal imager. The comparison shows reasonably good agreement between both results. One of the impacts from this study is a methodology applying to set a practice for student learning.
Poster-2 - Board: EDU-09 / 37
Developing Scientific Concepts on Magnetic and Electric Field us- ing Simple Experiment and Multimedia Learning
Author: Kreangkrai Tanawesh1 Co-author: Choksin Tanahoung 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Author: [email protected]
Science experiment plays an important role in developing scientific knowledge for learners in sci- ence. Effective teaching methods must emphasize learning by experimenting where students seereal phenomena. Through low-cost simple experiments designed for hands-on activity in conjunction with the reinforcement of graphical multimedia, the students have enhanced the matching scientific concepts. This method helps to solve the lack of scientific equipments. The purpose of thisresearch was to develop the students’ scientific concepts on magnetic and electric fields using science inquiry process by simple experiments in conjunction with multimedia learning. The pretest and posttest control group design wasem- ployed in carrying out the study. The research tools consisted of simple experiments and the multi- media learning, lesson plans based on the science inquiry process, the magnetic and electric fields concepts 2-tiers test, think-aloud interviews on the scientific conceptual test and student’s satisfac- tion test. The data were analyzed into the average percentage, standard deviation, t-test and average normalized gain. The result of the target group shows statistically significant mean differences be- tween the pre-test and post-test at significant level of .01. The class average normalized gainwas in the medium gain (0.33). The students’ abilities to explain the concepts in levels of good,have positive comments, and have very satisfied about the learning process. This result indicated that science inquiry process by simple experiments and multimedia learning can be used to develop students’ conceptual understanding on magnetic and electric fields. The students had an opportunity to experience from actual practice to build up new body ofknowl- edge by themselves, enhancing scientific concepts through the multimedia learning and therefore students have positive attitude for science learning process.
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Poster-2 - Board: BIO-10 / 339
Health Determinations of Yeast Suspensions for Brewery Indus- try using Cell Velocity Spectrum
Author: Sakshin Bunthawin1
Co-author: Raymond Ritchie 1
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand
Corresponding Author: [email protected]
Living yeast cells in the brewery industry are active cells. They have different responses to AC electric field if they possess different dielectric properties. Electrical parameters which are used to determine health of yeast cells are the conductivities of the cytoplasm (σc), the cell membrane (σm), dielectric constant of the membrane (εm) and the cytoplasm (εc), respectively. These parameters affect cell translational speeds of positive dielectrophoresis. We measured yeast velocities during their moving towards the electrode tips, under various AC field frequencies. Lower critical frequency (LF), where yeast cells were repelled (i.e. negative force) from the tip after being attracted, was recorded against the conductivity of cell suspension medium(σs). It was observed that as the σs was increased the LF was shifted towards a higher frequency value. Yeast velocity spectra were reduced significantly under greater σs value. When the increased σs reached a critical value the attractive force became negligible, implying equivalence to the cytoplasmic conductivity. Our experiments showed that yeast cells of 1.15 × 105 cell.ml−1 displayed the initial positive di- −1 electrophoresis at LF of 60-80 kHz, when using σs of 6 µS.m . The velocity spectrum of yeast suspensions were affected by σs of which the cells were suspending during the experimentation. An abrupt change in the velocity pattern explained dielectric properties of cell membrane and cyto- plasm of yeast cells which reflect their health. By curve-fitting method, we achieved to determine health of yeast suspensions through the cytoplasmic and the membrane conductivity values.
Poster-2 - Board: BIO-06 / 335
Mathematical Analyze of Breakdown Transmembrane Potentials of Fish Eggs using Hen-egg model
Author: Sakshin Bunthawin1
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand
Corresponding Author: [email protected]
The present study proposes another alternative approach to model the geometry of Nile tilapiaegg for evaluation of the induced transmembrane potential. The actual shape of tilapia egg is an asym- metrical prolate spheroid with a short prolate spheroid bottom and a more elongate prolate spheroid at the top with a common equator rather than a symmetrical prolate spheroid. Unfortunately, the precise model of such non-spherical bioparticle does not exist as yet. In the past, the closest avail- able model was as a shelled symmetrical prolate-spheroid which gave the large error to calculate transmembrane potential. This work proposes the complete “hen-egg model” to analyze the implicit value of electrical breakdown transmembrane potential. The two semi-minor axes (b, c) are set to equal one another. The ratio between the semi-major (a) and semi-minor axes is 1.3. We keep the volume of the egg constant throughout our analysis which is equivalent to that of the “hen-egg model” possessing the effective values of the semi-major a′ and the semi-minor b′ axes so that the polarization of the egg can be assumed to be the same over the whole egg volume. In the case of the egg possessing a single dielectric shell, it was also analyzed as the equivalent tri-phases of RC-circuit using three pairs of resistors and capacitors to represent the conductive and capacitive properties of the egg’s shell, the inner part of the egg and the suspending medium, respectively. The complex
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specific impedances of each compartment of the fish egg were finally analyzed. The threshold trans- membrane potential for electroporation of tilapia’s egg is evaluated. This approach can not only be applied to the spheroid model but also to model of the ellipsoid, oblate-spheroid and spherical shaped object by changing the appropriate value of the depolarization factor depending on the 3-D egg geometry.
Poster-2 - Board: BIO-08 / 337
Pulse-Electric Fields Inductions for Preliminary Sex Reversal of Blue-Spotted Coral Trout
Author: Sakshin Bunthawin1 Co-authors: Raymond Ritchie 1; Tawat Sriveerachai 2
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand 2 Phuket Coastal Fisheries Research and Development Center, Muang, Phuket 83110, Thailand
Corresponding Author: [email protected]
The present study proposes an alternative technique of monosex-male reversal for the commercially important marine fish, blue-spotted coral trout (Plectropomus leopardus), using transient square pulse- electric and androgen hormone dose. The egg of P.leopardus had a simple spherical shape (≈ 0.8±0.1 mm) and its critical age of 6-19 hpf (hour post fertilization) were induced in the external field with 1-8 square wave pulses of 5-50 µs duration and amplitude of 350-500 VDC (equivalent to 87.5-125.0 kV.m−1). The suspending medium of electroporation (EPM) contained PBS buffered (1M manni- tol added to make the EPM medium isotonic to seawater, pH 7.5 adjusted with NaOH) with the minimized concentration of the androgen hormone 17α-methyltestosterone (MT). These electrical parameters affect sex reversal rate. The optimized values are 400 VDC, 5 square-wave pulsesof50 µs duration with the concentration of 1,500 µg.l−1 MT. Nevertheless, we have not yet accurately determined the sex reversal rate since their sex will be stable only after they are 2-3 years old. This study only claims sex reversal of 18 months old fish with temporary all-male sex reversal rate at 76.45-82.51% (n=18), less than 27% egg death. The capacity of our equipment was acceptable at a commercial density ranging from 550-1,000 eggs/50ml for each induction. This novel technique could reduce the MT dose down to a minimized value with a rapid throughput of only quarter-hour per batch of eggs and using only 50 ml lots of hormone containing medium.
Poster-2 - Board: BIO-07 / 336
Electrical sex reversal of Nile tilapia from prototypes toward com- mercial product
Author: Sakshin Bunthawin1 Co-authors: Kata Jaruwongrungsee 2; Raymond Ritchie 1
1 Biotechnology of Electromechanics Research Unit, Science of Physics, Faculty of Technology and Environment, Prince of Songkla University, Kathu, Phuket 83120, Thailand 2 Nanoelectronics and MEMS Laboratory, National Electronics and Computer Technology Center (NECTEC), Na- tional Science and Technology Development Agency (NSTDA), Ministry of Science and Technology (MOST), Pathumthani 12120, Thailand
Corresponding Author: [email protected]
The present project has been extended from our previous lab-scale work of sex reversal for monosex- male Nile tilapia by using a transient pulse-electric field induction toward commercial products. All
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male sex reversal rate from 89.25% to 92.5% is achieved. Our newly equipment (to be patented) of electrical sex reversal was developed for large-scale of more than 10,000 eggs for each induction. This version of the equipment is designed for commercial propose (> 1 million induced eggs/day) without distortions of the signal (less than 5% error). In this work we demonstrated the boundary conditions of reversible and irreversible electropermeabilised eggs (critical values) (when they per- form in temperature between 20-35 ◦C) suspended in electrical sex reversal mediums (to be patented through NSTDA) to optimize survival rate and hatching of the induced fry. This work we also clari- fied the most suitable stage of egg development (day post fertilization: dpf) to be selected forthebest electrical sex reversal process. We found that all stages during (a) zygote−1 dpf (b) cleavage−1 dpf (c) blastula−1 dpf (d) segmentation−2 dpf and (e) pharyngula−3 dpf before hatching−5 dpf could be employed for electrical sex reversal but pharyngula was the optimized phase. Long-term moni- toring of the stable-sex reversal of all induced fry had been verified in order to test for 4-6 months old fish of table size, 6-9 months old and 9-12 months old (parent breeding stocks). Studyofhor- mone delivery through the permeabilised membrane including hormone remaining in the electrical sex reversal medium for reuse propose of commercial product. Details of the sex reversal process including our equipment cannot be revealed since they are being in the patent process.
Poster-2 - Board: EDU-32 / 252
Surveying Physics Teaching Strategies in Three Leading Schools
Author: Umporn Wutchana1
1 Department of curriculum and instruction, Faculty of Education, Ramkhamhaeng University, Bangkok, 10240, Thai- land
Corresponding Author: [email protected]
To obvious how leading schools conduct their physics classrooms, this study has surveyed teaching strategies in physics classrooms of three leading schools (Mahidol Wittaynusorn, Triamudom Suksa, and Suankularb Wittayalai) using a 2 page survey. The contents of the survey were separated into two parts. Part 1 includes questions asking students to provide their personal information such as gender, age, grade, and favorite subjects. Part 2 includes a question that asking students to select activities which frequently happened in their physics classrooms from a list. The survey was dis- tributed randomly to high-school students in those three leading schools during the 1st and 2nd semesters in 2014 academic year. Students took approximately 10 minutes to complete the survey. After that, their responses were tallied to see the frequency. The activities showed more thanfiftyper- cent responses were concentrated as dominant characteristic of teaching strategies. The surveying results showed similarity of physics teaching strategies between Triamudom Suksa and Suankularb Wittayalai. The teaching strategies in both schools quite focused on providing information, exercise and examples of solving physics problems while the differences found in Mahidol Wittaynusorn. Besides providing information, exercise and examples of solving physics problems, physics teachers let their students do more experiment than the students of those two schools.
Poster-2 - Board: EDU-24 / 221
The study scientific concepts about conservation of mechanical energy in before and after learning through Predict-Observe-Explain approach for Grade 10 Students
Author: Paritat Picitmal1 Co-authors: Chaiyapong Ruangsuwan 2; Panata Puwanich 2
1 Department of Education in Science and Technology, Faculty of Education, KhonKaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, KhonKaen University, Thailand, 40002
Page 110 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
The purpose of this research was to study scientific concepts of the student in conservation ofme- chanical energy both before and after learning through predict-observe-explain (POE) approach. The target group was 34 grade 10 students, Strisuksa School. The Office of Secondary Education District Area 27, Roi-Et, those studied in the second semester, academic of year 2014. The students’ scientific concepts in conservation of mechanical energy had been studied by using pre-test and the results were used as guiding to develop the conservation of mechanical energy lesson plans. The post-test was done soon after the POE finished. The evaluation tool consisting scientific conceptual test,mul- tiple choices combined with short explanation their answer. The collected data were analyzed by interpreting into groups of scientific concepts and then comparing between pre-test and post-test. The findings revealed that student’ scientific concepts in prior learning of the student sciencecould interpret into various categories and the majority of them were diverged from commonly scientific concepts, but the post-test performed that students scientific concepts generally converging to the scientific concepts. It could be concluded that the POE approach supporting the students togain their understanding in conservation of mechanical energy.
Poster-2 - Board: INS-04 / 99
Development of weather station for wind direction, wind speed and temperature measurements
Authors: Jintana Loupaiboon1; Rewat Loupaiboon1; Somkid Pencharee1; Warut Singseeta1
Co-author: Decho Thong-aram 2
1 Department of Physics, Faculty of Science, Ubon Ratchatani University, Warinchamrab, Ubon Ratchatani, 34190, Thailand 2 Department of Nuclear Engineering, Faculty of Engineering, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand
Corresponding Author: [email protected]
This work was aimed to study program for control an anemometer, wind vane, and thermometer sensor with dsPIC33 microcontroller. This prototype was developed for basic measuring, storing and monitoring weather data by personal computer. There are 3 parts of measurements. The first, wind direction was measured by wind vane. The structure of the sensor is a variable resistor. Voltage divider circuit was applied to the sensor. Second, wind speed was measured by anemometer. The structure of the sensor is cylindrical spindle. Frequency signals sent from it was detected by capture command on microcontroller. Wind direction and wind speed were calibrated by wind simulation and compared with standard tools. The last, temperature was detected by digital DS18B20 ther- mometer sensor. It interfaced a 1-wire bus to communicate one port pin of microcontroller. Serial data signals are communicated between the personal computer and the sensor. In this research, the authors have successfully demonstrated a prototype and monitored weather at Ubon Ratchathani University station. It was able to convert these signals to acceptable values.
Poster-2 - Board: EDU-22 / 163
Analysis of Students’ Task Relating to Boyle’s law, Charles’s law and Kinetic Energy for Gases.
Author: Pattarawut Chaweewong1
Co-author: Udom Tipparach 1
1 Department of physics, Faculty of Science, Ubon Ratchathani University, Thailand, 34190
Page 111 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
The purpose of this study was to examine student responses to a task relating to Boyle’s law, Charles’s law and kinetic energy for gases, which did not demand the use of a mathematical equation for its solution. The target group was 33 students in grade 11 from Ummaoprachasan School, Amphur Thatphanom, Nakhonphanom province. All students studied in the second semester of academic year 2014. The group pretest-posttest design was employed in this study. The research instruments consisted of lesson plans based on peer instruction, diagnostic test, and a set of experiments relating to Charles’s law and kinetic energy for gases, respectively. The data were analyzed by using the average percentage, standard deviation and t-test.
Summary: The results showed that there was statistically significant mean difference between the pre-test andpost- test (p < .05). After learning by the peer instruction approach, the number of students had morecorrect conceptual understanding of Charles’s law and kinetic energy for gases compared with before learning. This research indicates that physics teachers should enhance students’ understanding of Charles’s law and kinetic energy for gases with active learning approach.
Poster-2 - Board: INS-08 / 224
Electronic Tongue as an Alternative Tool for Classifying Oil-Based Products
Author: Vittachai YUWAPHAN1
Co-authors: Anat PHATTHARA-ANEKSIN 1; Anurak SEEDA 1; Chaleeda BOROMPICHAICHARTKUL 2; Rungroj MAOLANON 3; Sirapat PRATONTEP 1; Thanawee CHODJARUSAWAD 1
1 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, 10520, Thailand 2 Department of Food Technology, Faculty of Science, Chulalongkorn University, Payathai, Bangkok, 10330, Thailand 3 NANOTEC, National Science and Technology Department Agency (NSTDA), Thailand Science Park, Klong Luang, Pathumthani, 10520, Thailand
Corresponding Author: [email protected]
Current electronic noses have limitations in olfaction of oil-based compounds, owing to their low responses for metal oxide gas sensors. This research is aimed to develop an alternative method toclas- sify oil-based products, including fragrance, by using derivatizing agent to derivatize oil-based com- pounds followed by measurements with an in-house electrochemical electronic tongue (e-tongue). The electronic tongue has been designed and constructed based on the pattern classification ofcyclic voltammograms. Cooking oil and oil-based fragrance samples were mixed with an aqueous solution of citric acid and characterized by e-tongue. The electronic tongues were also compared to measure- ments by an electronic nose based on metal oxide gas sensors. Preliminary results indicates that the e-tongue in combination with the derivatization method is able to classify the oil-based compounds in terms of type and quantity, outperforming the e-nose.
Poster-2 - Board: BIO-01 / 111
The Determination of the Area of Origin in Medium Velocity Blood Spatters: Numerical Methods Approach
Author: Chalermwat PINNOI1
Co-author: Ratchapak CHITAREE 2
Page 112 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400 2 (Department of Physics, Faculty of Science, Mahidol University, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
In crime scene reconstruction, the patterns of bloodstains serve us opportunities to determine thelo- cation of bloods source which can be referred to the position of victim or weapon used. For medium velocity blood spatters, generally the victim is hit by a blunt object (such as a hammer or abaseball bat). The trajectories of blood drops are in projectile motions. In this work, the projectile motionof blood drops with the effect of air resistance was considered. The trajectories are recreated bysolv- ing the equation of projectile motion of projectile motion and using the numerical method, Runge- Khutta 4th order, in time reversal procedure. The area of origin could be obtained by creating the trajectories of all selected bloodstains. The numerical results give a good approximation to locate the area of origin of bloodstains with acceptable errors.
Poster-2 - Board: EDU-20 / 150
Developing STS Projectile Motion Unit for Providing Students’ perception of the relationship between Science Technology En- gineering and Mathematics
Author: Prapatsorn Seattha1 Co-author: Chokchai Yuenyong 2
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Science Education, Faculty of Education, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
STEM education suggested that students should be enhanced to learn science with integration be- tween Science, Technology, Engineering and Mathematics. To help Thai students make sense of relationship between Science, Technology, Engineering and Mathematics, this paper presents learn- ing activities of STS Projectile Motion Unit. The developing of STS Projectile Motion Unit is apart of research that aimed to enhance students’ perception of the relationship between Science Technol- ogy Engineering and Mathematics. This paper will discuss how to develop Projectile Motion Unit through STS approach in framework of Yuenyong (2006) where learning activities were provided based on 5 stages. These included (1) identification of social issues, (2) identification of potential solutions, (3) need for knowledge, (4) decision-making, and (5) socialization stage. The learning ac- tivities could be highlighted as following. First stage, we use movie of ‘Conan the barbarian (human catapult)’. Second stage, students will need to identification of potential solutions by Create Catapult Model. The need of scientific and other knowledge will be proposed for various alternative solutions. Third stage, students will gain their scientific knowledge through laboratory and simulation ofpro- jectile motion. Fourth stage, students have to make decision for the best solution of designing and creating catapult model based on their scientific knowledge and others (e.g. mathematics, economics, art, value, and so on). Finally, students will present and share their catapult model in society (e.g. social media or exhibition) in order to validate their ideas and redesigning.
Poster-2 - Board: CON-04 / 153
Electronic and dynamical properties of YHx (2.83 < x ≤ 3.00)
Author: Anuphong Thongted1 Co-authors: Prutthipong Tsuppayakorn-aek 1; Teerachote Pakornchote 1; Udomsilp Pinsook 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, THAILAND 10330
Page 113 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
According to thin film experiments, the electronic property of yttrium-hydride (YHx) system changes as a function of hydrogen concentration. The transformation of yttrium dihydride (YH2) into yttrium trihydride (YH3) structure by hydrogenation causes its resistivity to increase rapidly, and is constant after the YH2.85 is formed. We used ab-initio calculations to study the electronic and dynamical properties of YHx hcp phase, where 2.83 < x ≤ 3.00, by removing hydrogen atoms at different sites. Results show metal-to-semiconductor transition with increasing hydrogen content, consistent to the experiment.
Poster-2 - Board: INS-02 / 90
Sound absorption of oil palm trunks
Author: Asleena SALAEH1
Co-authors: Pansak KERDTONGMEE 2; Sorasak DANWORAPHONG 1; Thammarong EADKHONG 1
1 Acoustics Laboratory, School of Science, Walailak University, Nakhon Si Thammara, Thialand 80160 2 Faculty of Education, Nakhon Si Thammarat Rajabhat, Nakhon Si Thammara, Thialand 80000
Corresponding Author: [email protected]
Thailand was listed as the third in palm oil production in the world with the plantation areaof about 5600 km2 as in 2010. The plantation area is increasing due to the demand for the oil.Asa result, there is plenty palm biomass leftover after each replanting process of oil palm trees. Biomass from each part of oil palm tree has been investigated for various applications such as particleboard and compressed wood panels. In this work, we explore the possibility of using oil palm biomass as sound absorbing application using a standing wave tube for the frequency range of 300-2000 Hz. The biomass used in this work is oil palm trunk. Two different cutting directions, parallel and normal to the fibrous grain of the palm trunk, are considered. The processed biomass hasthe thickness and diameter of 12.5 and 114 mm, respectively. A biomass disk is then inserted into the standing wave tube at different distances away—0, 2, 4 and 6 mm—from the backing metal plate for the determination of the sound absorption coefficients. In addition, the disk is drilled for 3-mm diameter through holes of which are organized in periodic fashion with 10-mm separations. Our results show that the absorption coefficients for the cross-cut panel are slightly greater than thoseof the parallel-cut. This is possibly due to the panel porosity. The through-hole disk provides significant improvement particularly at frequency above 1000 Hz. Our work presents an alternative application for the oil palm biomass.
Poster-2 - Board: EDU-02 / 16
Using Simple Experiments incorporated with a Laboratory Group Investigation Model to Develop Conceptual Understanding of Static Electricity
Author: Akapong Buachoom1
Co-author: Sura Wuttiprom 1
1 Department of physics, Faculty of Science, UbonRatchathani University, Thailand, 34190
Corresponding Authors: [email protected], [email protected]
The purpose of this research was to study the development of students’ conceptions of static electric- ity using a laboratory group investigation model. The participants were 34 grade 10 students from Srikoonwittayabunlang School, Amnatcharoen in the second semester of the 2014 academic year.A
Page 114 Siam Physics Congress 2015 / Book of Abstracts
one group pre-test/post-test design was employed in the study, and the research tools consisted of lesson plans based on the group investigation technique and a static electricity conceptual test. Data were analyzed by the use of average percentages, standard deviations, t-test, and normalized gain. Results showed that there was an improvement in the mean post-test score compared to the mean pre-test score at a statistically significant level of .05.The average class normalized gain was atthe medium gain level.
Poster-2 - Board: EDU-29 / 230
The development of scientific of concept on electric current of grade 11 students through Predict – Observe – Explain : Class- room – Based Action Research
Author: Songsith Khunsawat1
Co-authors: Chaiyapong Ruangsuwan 2; Wiwat Youngdee 2
1 Department of Education in Science and Technology, Faculty of Education, Khon Kaen University, Thailand, 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Thailand, 40002
Corresponding Author: [email protected]
This research aims to develop Predict – Observe – Explain (POE) approach learning activities andto develop scientific concepts in Electric current. There were 28 grade 11 students, second semesterof academic year 2014 (November 2014 – March 2015), Narinukul School Office Mathayomsuksa Area 29, participated this study. The research methodology is classroom – based action research. The instrument used in this study were including POE 6 lesson plans on electric current, the instrument for reflecting the activities, learning activity note, observation field note, students’ project andquiz. The evaluation instruments Determining and Interpreting Resistive Electric Circuits Concepts Test (DIRECT) Version 1.2 Thai version. The qualitative data was analyzed and interpreted for the devel- opment scientific of concepts on electric current while the effectiveness had been analyzed byusing basic statistics. The findings showed that the developing learning activities of electric currentona classroom – based action research, plan, action, observe and reflect on 4 steps. Consider the results from last activity. The present of students who passed the criteria in action cycles 1, 2 and3were equal to 40.20, 72.55 and 91.25 percentages respectively and the development of scientific of concept on electric current. The findings showed that students’ understanding of electric current concept that were taught using Predict – Observe – Explain: classroom – based action Research has been improvement.
Poster-2 - Board: CON-08 / 232
High pressure properties of doped ZnO from ab initio calcula- tion
Author: Prayoonsak Pluengphon1
Co-author: Thiti Bovornratanaraks 2
1 Division of Physical Science, Faculty of Science and Technology, Huachiew Chalermprakiet University, Samutprakarn 10540, Thailand 2 Extreme Conditions Physics Research Laboratory, Department of Physics, Faculty of Science, Chulalongkorn Univer- sity, Bangkok 10330, Thailand
Corresponding Author: [email protected]
Page 115 Siam Physics Congress 2015 / Book of Abstracts
We performed ab initio calculation based on density functional theory for studying high-pressure properties of doped ZnO. At the beginning, the impurities of Al and Ga atoms into ZnO were in- vestigated up to 10 GPa. The tendency of enthalpy formation under pressure was studied. The high-pressure properties such as lattice parameter, electron density and elastic constant were inves- tigated. It was found that the enthalpy formation of doped ZnO decreases when pressure increasing. The chemical bonds and electron density differences of ZnO unit cells were changed by addingthe Al and Ga atoms.
Poster-2 - Board: INS-03 / 92
Micron-size Electrodes Fabrication for Capacitively Coupled Con- tactless Conductivity Detection (C4D)
Author: Jongrak Sanglao1
Co-authors: Korkuson Masean 1; Nirut Pussadee 2
1 Department of Physics and Materials Science, Faculty of science,Chiang Mai University, Chiang Mai, 50200, Thailand 2 Plasma and Beam Physics Research Facility, Department of Physics and Materials Science, Faculty of science ,Chiang Mai University, Chiang Mai, 50200, Thailand
Corresponding Author: [email protected]
Capacitively Coupled Contactless Conductivity Detection (C4D) is the detection technique used to detect both charged and non-charged particles in solution when performing electrophoretic separa- tion in microfluidic devices. With the C4D electrodes not directly exposed to solution, contamination of detecting specimen can be avoided. In this work, the new planar micro-size C4D electrodes on a glass slide fabrication technique based on Printed Circuit Board (PCB) patterning was developed to be used with microfluidic device. The negative dry film photoresist used was Dupont Riston FX-515 with the thickness of 15 microns. The opening area size in the photoresist film down to 50 microns was achieved using 15 second exposure of 400 nm – wavelength light source, and 30 seconds devel- opment time in 0.85% Na2CO3 solution. The patterned glass slide was deposited with approximately 20 nm-thick gold thin film using sputtering technique to create the goldC4D electrodes.
Poster-2 - Board: EDU-10 / 40
The effectiveness of learning with guided lecture worksheets de- signed based on students’ learning difficulties
Author: Thanida Sujarittham1
Co-authors: Jintawat Tanamatayarat 2; Kwan Arayathanitkul 3; Narumon Emarat 3
1 Science and Technology Education Programme, Institute for Innovative Learning, Mahidol University, Nakhon Pathom, Thailand 73170 2 King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand 10800 3 Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand 10400
Corresponding Author: [email protected]
Guided lecture worksheets have been used in the introductory physics courses for first-year science students at Mahidol University. A set of worksheets was regularly distributed to students before starting each lesson and used as a teaching tool during each lecture. This was done throughout the course. In this study, we have developed worksheets for teaching electrostatics in large-class lectures. We began by researching students’ understanding in the year 2011 using pre- and post- tests, and interviewing them in order to identify their difficulties occurred when they learned with
Page 116 Siam Physics Congress 2015 / Book of Abstracts
the worksheets (called ‘earlier worksheets’). We found that the earlier worksheets still could not well-address the learning difficulties for a large number of students. The average normalized gain was 0.45±0.22. Therefore, in 2012 we brought the student learning problems found in the year2011 to develop the lecture worksheets (called ‘new worksheets’) and used them in the class. We found that there was the higher learning improvement with the average normalized gain of 0.61±0.20. To ensure that worksheets reconstructed yield a good effectiveness on learning electrostatics, we again used them in the year 2013. The average normalized gain was 0.55±0.20 which was quite steady. Amongst the three years devoted to the study, we can conclude that the development of worksheets based on students’ particular learning difficulties can make the difference of student learning outcomes.
Poster-2 - Board: CON-05 / 169
First principles calculations of cation-ordering effects on elec- tronic band structure of ZnSnN2 and ZnGeN2
Author: Atchara Punya1
Co-author: Walter R.L. Lambrecht 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, THAILAND 50200 2 Case Western Reserve University
Corresponding Author: [email protected]
The Zn(Ge,Sn)N2 semiconductors are closely related to the (Al,Ga,In)N. Both families have band gaps that span the ultraviolet through the visible range. Attention in the II-IV-N2 has grown re- cently, with success in synthesizing ZnSnN2 reported in 2012 1 and the recognition of some of their unique optoelectronic properties and the potential that provide for designing novel and useful opto- electronic devices [2, 3]. It is also of great interest that several members of the II-IV-N2 family are made from earth-abandant and nontoxic elements. We investigate lattice ordering phenomena for Zn(Ge,Sn)N2 that are based on the wurtzite lattice, under the constraint that the octet rule be preserved. First-principles calculations of the energies of formation show that the differences in the energies of formation between Pna21 and Pmc21 crystal structures are 13±3 meV/fu (formula unit) for ZnSnN2 and an order of magnitude larger for ZnGeN2, and that for both materials the Pm31 structure, which contains only octet-rule-violating tetrahedra, has a significantly higher energy of formation and a signficantly lower band gap. The octet-rule- preserving model predicts a band gap that for ZnSnN2 is relatively insensitive to cation-ordering. The violations of the octet rule lead to significant narrowing of the band gap. The observation that ZnGeN2 orders in the Pna21 structure is consistent with the larger difference in the energies of for- mation of the Pna21 and Pmc21 structures in this case. The cation-ordering effects presented here has important implications for the optical, electronic and lattice properties of all wurtzite-based heterovalent ternaries.
1. N. Feldberg, B. Keen, J.D. Aldous, D.O. Scanlon, P.A. Stampe, R.J. Kennedy, R.J. Reeves, T.D. Veal, S.M. Durbin, Proc. 2012 IEEE Photovoltaics Specialists Conference, 002524 (2011). 2. Walter R.L. Lambrecht and Atchara Punya, III-nitride Semiconductors and their Modern Devices (Oxford University Press), chapt. 15 (2013). 3. Lu Han, Kathleen Kash and Hongping Zhao, Proc. of SPIE. 9003, 90030W-1 (2014).
Poster-2 - Board: CON-10 / 260
IR spectroscopy of O-related defects in CdSe
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Author: Pimpika Pimsorn1
Co-authors: Sukit Limpijumnong 1; jiraroj T-thienprasert 2
1 School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree Uni- versity of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000 Thailand; Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000 Thailand; Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok 10400, Thailand 2 Thailand Center of Excellence in Physics (ThEP Center), Commission on Higher Education, Bangkok 10400, Thailand; Department of Physics, Kasetsart University, Bangkok 10900 Thailand
Corresponding Author: [email protected]
Detailed infrared (IR) absorption spectroscopy of O2-related defects in zincblend-CdTe and wurtzite- CdSe were reported by Lavrov et al [Phys. Rev. B 84, 233201 (2011), AIP conf. Proc. 1583, 169 (2014)]. They clearly showed based on their experimental work that the IR absorption bands at1096.8and −1 1108.4 cm in CdTe samples are associated with the vibrational modes of SO2-related defects in CdTe. In wurtzite-CdSe, due to the reduction in the symmetry (in comparison to the zincblende −1 structure), there are three absorption peaks at 1094.2, 1107.5, and 1126.3 cm related to the SO2 defects, instead of two. T-Thienprasert et al [J. Appl. Phys. 115, 203511 (2014)] recently showed that SO2 in CdTe can form a complex defect with Cd vacancy becoming SO2-VCd complex defects with the vibrational frequencies in good agreement with the values observed by Lavrov et al. In this work, we employed first-principles calculations to study the SO2-related defects in wurtzite- CdSe. Their formation energies were calculated and used to analyze the stable ones. The vibrational frequency associated with each defect were calculated via the frozen-phonon approximation and used to compare with the observed values. In wurtzite-CdSe, We found that the SO2 defects can bind with VCd becoming SO2-VCd complex defects similar to the case of SO2 in CdTe. However, due to the lower symmetry of wurtzite structure, there are many possible orientations of SO2-VCd complex defects, which will be presented along with their formation energies as well as calculated vibrational frequencies.
Poster-3 - Board: MNA-61 / 253
Effect on the Mg2Si Synthesized by Solid State Reaction and Hot Pressing Process
Authors: Chalermpol Rudradawong1; Chesta Ruttanapun1
1 Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, THAI- LAND 10520
Corresponding Author: [email protected]
Metal/semiconductor Mg2Si compounds was synthesized by solid state reaction method. The sample was calcined at temperature 973 K in vacuum system. It was pressed into pellet, and then was sintered in hot-pressing process at 973 K. The Mg2Si was studied structure properties by XRD and SEM, electrical properties by Hall Effect at room temperature and thermal properties by laser flash method at 300 up to 500 K. Finally, the results of normal process and hot-pressing process effect on thermal conductivity were compared and reported.
Poster-3 - Board: MNA-47 / 187
Characterization and Analyzation of Chitosan from Paphia Un- dulate Shell
Author: Wichian Siriprom1
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Co-authors: A. Montree 1; K. Teanchai 2
1 Faculty of Science at Si Racha, Kasetsart University, Si Racha campus, Chonburi, THAILAND 20230 2 Material Science and Applied Physics Research Unit, Faculty of Science at Si Racha, Kasetsart University, Si Racha campus, Chonburi, THAILAND 20230
Corresponding Author: [email protected]
This work aims at characterizing the physical and chemical properties of chitosan which extract from the Paphia Undulate Shell. The physical and chemical properties have been also discussed in detail which Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-Ray Fluorescence (EDXRF) and X-Ray Diffraction (XRD), respectively. The result of the XRD pattern indicated thesam- ple has amorphous-crystalline structure and FTIR results confirmed the formation of intermolecular hydrogen bonding between the amino and hydroxyl groups of the sample which corresponding with the result of. the EDXRF, which report the highest concentration of chemical composition is CHO.
Poster-3 - Board: MNA-52 / 211
Comparative Study of Effects of Metal Oxides Modifications on Properties of Pb(Mg1/3Nb2/3)0.9Ti0.1O3 Ceramics
Author: Methee Promsawat1 Co-authors: Anucha Watcharapasorn 1; Napatporn Petnoi 2; Sukanda Jiansirisomboon 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200; Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200 2 School of Electrical Engineering, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000
Corresponding Author: [email protected]
This work studies effects of metal oxides (MO; M=Zn2+, Cu+ and Ni2+) modifications on phase, microstructure, dielectric, ferroelectric and electrostrictive properties of Pb(Mg1/3Nb2/3)0.9Ti0.1O3 (PMNT) ceramics. Different contents of MO (2 and 4 mol%) were modified into PMNT ceramics. The ceramics with the density about 7.80 g/cm3 were prepared. XRD pattern and lattice parameters of the PMNT ceramic did not change with the MO modifications. An average grain size of the PMNT ceramic increased with the ZnO and NiO modifications. The grain size was extremely enlarged with the CuO modification. A maximum dielectric constant of the PMNT ceramic was enhanced with2 mol% ZnO and 2 mol% CuO modifications while 2 mol% NiO modification resulted in a reduction of the maximum dielectric constant. A temperature of a maximum dielectric constant (Tmax) of the PMNT ceramic shifted toward a higher temperature with 2 mol% ZnO modification. Itwasde- creased with 2 mol% CuO and 2 mol% NiO modifications. Polarization-electric field curve of the PMNT ceramic was well developed with a higher remnant polarization (Pr) by 4 mol% ZnO modi- fication while it was slimmer with a lower Pr by the NiO modification. A maximum strainandan electrostrictive coefficient of the PMNT ceramic were enhanced with 2 mol% ZnO and 2 mol%CuO modifications.
Poster-3 - Board: MNA-46 / 186
Fabrication of CsSnI1−xFx Doped with ZnO for Photogenerated Holes in Solid-state Dye-sensitized Solar Cells
Author: Pornpanarat Ardchongthong1 Co-authors: Pawinee klangtakai 2; Samuk PIMANPANG 2; Vittaya Amornkitbamrung 2
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1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
CsSnI1−xFx doped ZnO were synthesized and used as the hole conducting in dye-sensitized so- lar cells (DSCs). The aim of this work is to study the effect of ZnO on the solid-stat DSCperfor- mances. CsSnI3 powders were prepared by heating a stoichiometric mixture of CsI (0.1 g) and SnI2 ◦ (0.07 g) at 450 C for 30 min in argon environment. CsSnI1−xFx solution were prepared by mixing 0.1 g of CsSnI3 powder and 0.005 g of SnF2 into 3 ml of N,N-dimethylformamide and acetonitrile. CsSnI1−xFx doped ZnO were prepared by adding ZnO (0.005 - 0.025 g) into the 3 ml CsSnI3 solution. The energy conversion efficiency of CsSnI1−xFx doped ZnO solid state dye-sensitized solar cells (SS- DSCs) were evaluated by a solar simulator (PEC-L11) under a light intensity of 100 mW/cm2. The efficiency of CsSnI1−xFx doped ZnO SSDSCs are about 2.24%, 2.68%, 2.91%, 3.09%, 2.88% and 2.66% for 0.0 g (undoped ZnO), 0.005 g, 0.010 g, 0.015 g, 0.020 g and 0.025 g of ZnO, respectively. The de- tail effect of ZnO nanoparticles with the average size of 30 nm on the SSDSCs performance willbe characterized by X-ray diffraction, scanning electron microscopy and UV-VIS spectroscopy.
Poster-3 - Board: MNA-33 / 148
Giant Dielectric Properties and Electrical Response Grain Bound- ary of Na1/3Ca1/3La1/3Cu3Ti4O12 Ceramics
Author: Pariwat Saengvong1 Co-author: Prasit Thongbai 1
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
The dielectric properties and electrical response of grain boundaries ofNa1/3Ca1/3La1/3Cu3Ti4O12 ceramics were investigated as a function of frequency. High dielectric permittivity (ε′ ∼104) and low loss tangent (tanδ<0.1 at 1 kHz) were observed in Na1/3Ca1/3La1/3Cu3Ti4O12 ceramics. Through analyses using a complex impedance spectroscopy, it was found that the dielectric properties of Na1/3Ca1/3La1/3Cu3Ti4O12 ceramics were closely related to the electrical response of grain bound- aries. The investigation of electrical response of the grain boundary suggested that the potential bar- rier at the grain boundaries of Na1/3Ca1/3La1/3Cu3Ti4O12 ceramics was due to the Schottky effect. The giant low frequency dielectric response inNa1/3Ca1/3La1/3Cu3Ti4O12 ceramics is attributed to Maxwell-Wagner polarization at the grain boundaries.
Poster-3 - Board: MNA-28 / 139
Production of Biodiesel through Transesterification of Palm Oil Using Waste Eggshells Catalyst
Author: Juthamas Inthanont1 Co-authors: Ekachai Hoonnivathana 2; Kittisakchai Naemchanthara 1; Pichet Limsuwan 1; Weeranut Kaewwiset 3
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900 3 Department of Physics, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, THAILAND 73140
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Corresponding Author: [email protected]
The aim of this research was synthesized biodiesel from palm oil using transesterification calcium oxide from various eggshells catalyst. The chicken, duck, ostrich, quail, and crocodile eggshells were heated at 1300 ◦C for 4 h. The ratio of methanol, palm oil and calcium oxide from eggshell were10 g, 3.0 ml and 0.8 g, respectively. The temperature of biodiesel synthesis was control at65 ◦C for 3 h. The properties of biodiesel from eggshell catalyst and commercial were characterized byUV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic spectroscopy (NMR). The UV-vis and FTIR results show that the biodiesel synthesized from all eggshells catalyst were corresponding with commercial biodiesel. The NMR results show that the yield of biodiesel from CaO of quail eggshells catalyst had higher than other eggshells. This research shows that the CaO from waste eggshells catalyst can be used transesterification of biodiesel.
Poster-3 - Board: MNA-69 / 301
Strain modification of MOVPE grown cubic GaN on GaAs (001) with GaN/AlGaN multi-interface buffer layer
Author: Kunpot Mopoung1
Co-authors: Kentaro Onabe 2; Manop Tirarattanasompot 3; Nattawut Tanyacasat 4; Sakuntam Sanorpim 5
1 Nanoscience and technology, Graduate school, Chulalongkorn University, Bangkok, THAILAND 10330 2 Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 3 Scientific and Technological Research Equipment Centre, Chulalongkorn University, Bangkok, THAILAND 10330 4 Department of Physics, Faculty of Science, Chulalongkorn University 5 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
We have investigated cubic GaN (c-GaN) layers on GaAs (001) substrates by using high resolution X- ray diffraction (HRXRD) to verify strain modification due to a use of the GaN/AlGaN multi-interface buffer layer. To examine lattice parameters and residual strain, both a symmetric (002) andanasym- metric (113) reflections were performed using 2θ-ω mode HRXRD for different types of c-GaNsam- ples. Cross-sectional scanning electron microscopy (SEM) images were used to verily thicknesses of the buffer layer and the GaN top layers. It is found that the fully relaxed lattice constant ofc-GaN was determined to be closer to the values of a hypothetical perfect crystal (4.503 Å). Besides, a type of buffer layers remarkably effects on an in-plane strain (ε//), which is caused by a combination of a large lattice-mismatch and a difference of thermal expansion coefficients between GaAs andc-GaN. The c-GaN layers with the AlGaN/GaN structure exhibited a tensile strain. While, the c-GaNlayers on the conventional low-temperature grown c-GaN buffer layer were examined to be under com- pressive strain. With the use of GaN/AlGaN as a buffer layer, residual strain in c-GaN thick layers were adjusted to be a tensile strain. Based on our results, we interpreted this strain modification as a competition between the lattice-mismatch and thermal mismatch stresses. This indicates that the relief of strains in the c-GaN layers has a complicated dependence on a type of buffer layers, especially for multi-interface buffer layer.
Poster-3 - Board: MNA-51 / 209
New Dye Sensitizers from Anthraquinone Derivatives for Appli- cation in Dye-Sensitized Solar Cells: a DFT Study
Author: Sarawut Tontapha1
Co-authors: Vittaya Amornkitbamrung 2; Wichien Sang–aroon 3
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1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Integrated Nanotechnology Research Center, Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 3 Department of Chemistry, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, THAILAND 40000
Corresponding Author: [email protected]
New dye sensitizes from anthraquinone derivatives for application in dye–sensitized solar cells (DSSCs) were theoretical investigated. The ground and excited state properties of the dyes were studied by using density functional theory (DFT) at M06/6–311G(d,p) level and time–dependent DFT (TD–DFT) method at the same level, respectively. The introduction of the anthraquinone derivatives has been shown to interestingly affect the geometrical and electronic properties of dye sensitizes for the DSSCs. In addition, effects of dyes adsorbed on surface of semiconductor TiO2, namely dye@TiO2, were also investigated. Moreover, thermodynamic and optical properties have been studied and reported.
Poster-3 - Board: MNA-27 / 128
Investigation of Elastic Property of Thermoelectric Materials Pre- pared by Bridgman Method
Author: Kanyaphach Armart1
Co-author: Somkid Pencharee 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
The study of thermoelectric material BiSbTe was prepared by Bridgman method with a growthrate 4 mm/hr. Structural investigation by using XRD technique. From the XRD pattern apparent peak at plane (1010) of BiSbTe and the orderly arrangement of unit cell. The longitudinal velocity was measured by ultrasonic method. Density was measured by Archimedes method (6.35 g/cm3). The longitudinal modulus of this material can be calculated by the longitudinal velocity and density (L = 39.6 GPa).
Poster-3 - Board: MNA-14 / 82
The Study of Fuel Pellet from Cassava
Author: Wipakorn Rittisut1
Co-author: Jintana Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
This research aims to study the cassava biomass fuel pellets prepared by cold compressed techniques with high pressure. Cassava chips were ground and sieved in the grain size of 150-300, 300-2000 and >2000 μm and are compressed with 8, 10, 12, 14 and 16 tons/cm2. The dimension of cassava fuel pel- lets is 4 cm in diameter and 1.5 cm in thickness. The results show that the heat of cassava fuel pellets, measured with bomb calorie meter, has a heating value of 3,790 Kcal/Kg, the compressive strength is correlated with the size and the pressure applied compressive cassavas were not significant. (The grain size of 150-300 and 300-2000 μm are compressed at high pressure from 10 - 16 tons/cm2, which
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show that they have high compressive strength.) The cost of fuel pellets is equal to 0.12 bahtper pellets. In this research, the most effective of biomass fuel pellets is biomass fuel pellets whichhas grain size >2000 μm and with pressure of 16 tons/cm2 and biomass fuel pellets with minimum burn rate is biomass fuel pellets with grain size >2000 μm and with pressure of 16 tons/cm2. Our results show that the fuel pellets made from this study have the potential to be used as a household fuel to substitute charcoal which is scarce and more expensive.
Poster-3 - Board: MNA-35 / 158
Synchrotron X-ray Absorption Spectroscopy Study of Local Struc- ture in Hydroxyapatite Doped by Strontium
Author: Atipong Bootchanont1 Co-authors: Likit Temprom 2; Narong Chanlek 3; Pimsiree Suwanna 4; Pinit Kidkhunthod 3; Rattikorn Yimnirun 1; Sarochapat Sutikulsombat 2
1 School of Physics, Institute of Science, and COE-NANOTEC-SUT on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000 2 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 3 Synchrotron Light Research Institute, Nakhon Ratchasima, THAILAND 30000 4 Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
Generally, the medical treatment of osteoporosis was used orally by strontium-base medicine be- cause of its stimulative effect on bone formation. In this work, Hydroxyapatite-based bone (HAp) doped by Sr was investigated for the global structure by X-ray diffraction technique and the local structure by Synchrotron X-ray Absorption Spectroscopy technique. The Sr L3-edge X-ray Absorp- tion Near-Edge Structure (XANES) spectra were measured and compared with the simulated spec- tra. The results show that the local environment of Sr distribute on the different locations ofCa site in Hydroxyapatite material. The Sr was found to substitute on the two different Ca siteswith the proportion around 70% in the calcium phosphate site (Ca1) and 30% in Ca2 site close to -OH group.
Poster-3 - Board: MNA-59 / 245
Metal Decorations on Graphene as a Hydrogen Storage Material
Author: Suphagrid Wongprakarn1
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Metal binding energies of various metals such as Li, Be, B, Na, Al, Mg and Ca trapped on graphene and hydrogen adsorption energies corresponding to these metals are calculated by using the density functional theory. Our results reveal that Li, Be, Na, Al and Ca are trapped on the graphene with metal binding energies of about 3.49–3.87 eV. These binding energies are high enough to hold these metals on graphene at room temperature. Moreover, we also calculated the hydrogen adsorption energy when a hydrogen molecule is adsorbed on these considered metals and found that Li gives the highest hydrogen physisorption energy com- pared to all considered metals, namely about 0.136 eV. Consequently, Li is regarded as the best choice for adsorbing hydrogen molecule.
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Poster-3 - Board: MNA-44 / 180
Characteristics of AZO/Ag/AZO Tri-layer Film by RF-sputtering
Author: Yuttapichai Khummanee1 Co-author: Watcharee Rattanasakulthong 1
1 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
Al-doped ZnO (AZO)/Ag/AZO tri-layer thin films were deposited on glass substrate by RF-sputtering. The thickness of AZO layer at the top and bottom of the film was varied at 35, 50and90nm the thickness of Ag layer was fixed at 62 nm. XRD result confirms that all AZO/Ag/AZO tri-layer films were composed of ZnO (HCP) phase in (002) direction and Ag (FCC) phase in (111) and(200) directions. Intensity of ZnO phase was directly increased with increasing AZO layer-thickness. The electrical resistance of the tri-layer film was decreased with increasing the AZO-thickness. The transmittance pattern of the film was significantly depended on the AZO thickness. Tri-layerfilm with AZO thickness of 35, 50 and 90 nm showed the average transmittance of 24, 28 and 15%in the visible region, respectively and also displayed the maximum transmittance of 50%, 35% and 28% at wavelength of 400, 500 and 700 nm, respectively. The results implied that transmittance pattern, transmission region and wavelength of maximum transmission of AZO/Ag/AZO tri-layer film can be manipulated by the AZO layer thickness.
Poster-3 - Board: MNA-31 / 144
Thermal and Electrical Properties ofP2O5-CaO-Na2O Glass Con- taining Ba0.6Sr0.4TiO3
Author: Pratthana Intawin1 Co-authors: Kamonpan Pengpat 1; Wilaiwan Leenakul 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200 2 Faculty of Science, Rajamangala University of Technology Phra Nakhon, Bangkok, THAILAND 10300
Corresponding Author: [email protected]
Five different compositions of the system P2O5-CaO-Na2O containing 0, 10, 20, 30 and 40 mol% of Ba0.6Sr0.4TiO3 were prepared by the melt quenching method. The effects of composition on their thermal properties and dielectric properties were evaluated and discussed. The glasses were evaluated for glass transition temperature (Tg) and dielectric constant ε. The electrical and the thermal properties were also compared with theoretical data. Tg of the glasses varied between 450 and 530◦C.The dielectric constant ranges from 6 to 9 and a dielectric loss of 0.0012 at 4.8 GHz,which provide an attractive feature for microwave applications.
Poster-3 - Board: MNA-45 / 184
Nano-materials from Rice Husks for Lithium Ion Battery Appli- cations
Author: Chirapan Chaikawang1 Co-authors: Ekaphan Swatsitang 2; Nonglak Meethng 2; Orapa Tamwatana 1; Sarawut Pongha 2
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1 Material Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Khaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Khaen University, Khon Khaen, THAILAND 40002
Corresponding Author: [email protected]
Our research team has studied the potentials of producing nanostructured silicon and silica using rice husk as starting raw materials. We have developed several nanostructured silicon and silicon derivatives from agricultural wastes due to its large quantity, easy to process, and cheaper to be developed into nanomaterials with high economic value. Nano-silicon and its derivatives can be extracted from rice husk using our chemical and thermal processes. The purity of the silica (>91%) and the investigation crystalline phase formation using X-ray diffraction (XRD) found that the pure phase of silicon. The particle sizes of 10-20 nm and morphology particles are spherical particles can be obtained by the investigation microstructural characterization of nano-materials were carried out using Transmission electron microscopy (TEM) and scanning electron microscopy (SEM). These recovered nano-silicon exhibits high performance as Li-ion battery anodes with a reversible capacity of 1,300 mAhg−1. We can produce high performance electrodes from nano-silicon, silicon composite with carbon, and silicon composite with silicon carbide with sizes on the nanometer scale. Nano- silica can be used as raw material in the synthesis of lithium iron silicate (Li2FeSiO4) cathodes for lithium ion battery as well.
Poster-3 - Board: MNA-64 / 282
Improvement of Mechanical Properties of Rattan Fiber–reinforced/Carbon Nanotube/Epoxy Resin Composites by Alkaline Treatment Method
Author: Priyavit Pattanakitkaset1
Co-author: Wim Nhuapeng 1
1 Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
In this work, mechanical properties of short rattan fiber (Calamus sp.7 of in San Pa Koi, Chiang Mai) approximately length 1.0 cm – Carbon Nanotube reinforced epoxy resin composites were in- vestigated. Rattan fibers were treated in Sodium Hydroxide in different concentration and soaking time. To improve the ability of adhesion compare with non-soaked rattan fibers and destroy exter- nal surface, which is coated with waxy substances. Then, compare with different ratio of soaked and non-soaked fiber (5%, 10% and 15% v/v) for reinforced suitable. Moreover mix different ratio of the fibers and Carbon Nanotube and epoxy resin composites for testing mechanical properties, such as impact, stress etc. and the result are showed the impact and stress properties of soaked Rattan Fiber-reinforced/Carbon Nanotube/epoxy resin composited more stronger than soaked and non-soaked Rattan Fiber-reinforced epoxy resin composited and good agreement with SEM charac- terizations.
Poster-3 - Board: MNA-13 / 81
The Effect of Calcination Temperature on the Dielectric Proper- ties of (1 − x)BaZr0.25Ti0.75O3+xSrFe0.5Nb0.5O3 ceramics
Author: Lalita Tawee1
Co-author: Gubwute Rujijanagul 1
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1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
In this research, The (1 − x)BaZr0.25Ti0.75O3-xSr Fe0.5Nb0.5O3 ((1 − x) BZT+ x SFN) with 0 ≥x ≥0.9 (x = 0.0−0.9) mol% were prepare by solid-state method. The powder were calcined at 1250 ◦C for 3 h and 1300 ◦C various dwell times ( 3, 6, and 12 h) and then sintered at 1450 ◦C for 4 h. Effect of calcination temperature on the physical properties of (1 − x) BZT+ x SFN lead-free ceramic was investigated. Phase formation, microstructure, and dielectric properties were investigated. The ce- ramics of x=0.7 exhibited a perovskite structure with cubic symmetry. Furthermore, the ceramics exhibited a dielectric relaxation like behavior with high dielectric constant over a wide tempera- ture rang. The impedance measurements indicated that bulk and grain boundary resistance ofBZT ceramics had a strong effect on the dielectric behavior.
Poster-3 - Board: MNA-29 / 140
Effects of Zn Substituted on the Structure of Hydroxyapatite Syn- thesized from Waste Chicken Eggshells
Author: Chutharat Paikaew1 Co-authors: Ekachai Hoonnivathana 2; Kittisakchai Naemchanthara 1; Pichet Limsuwan 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
In this research, Zn substituted Ca hydroxyapatite synthesized from waste chicken eggshells were prepared precipitation method. The structure properties and morphology were investigated by X-ray diffraction (XRD) Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results showed that the intensity of XRD pattern and crystallite size of hydroxyapatite decreased with increasing Zn concentration and function groups of hydroxyapatite and Zn were confirmed by FTIR. The hydroxyapatite was transformed to parascholzite2 (CaZn (PO4)2•2H2O) phase after added Zn more than 20 percent weight. The SEM images show that the particle size of hydroxyapatite reduced with increasing Zn concentration. The experimental results indicated that the Zn can be substituted Ca hydroxyapatite by precipitation method.
Poster-3 - Board: MNA-49 / 194
Fabrication and mechanical properties of doped-hydroxyapatite composite.
Author: Likit Tp1
1 urn:Facebook
Corresponding Author: [email protected]
Ionic substitutions in hydroxyapatite (HA) have been extensively studied to improve its biological and/or mechanical properties. This work aimed to prepare and characterize the composite of poly- caprolactone (PCL) and Zn-doped, Sr-doped or Zn/Sr-codoped HA. The doped HA nanoparticles were first prepared via a sol-gel method. XRD and FTIR results of the calcined powder showedthat HA is the main phase, with b-TCP as the second phase and chemical composition is accordance to other public data. To prepare the composite, the doped HA and PCL powders were mixed at the
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ratios of 3:7, 4:6, 5:5 and 6:4, and then compressed into a disc shape using an uniaxial hydraulic pressing technique. The specimens were then subjected to a compression test. Young’s modulus was found to increase as the HA content increased. The composites with the 6:4 Sr-doped HA/PCL ratio have the values of compressive modulus of 16.26 GPa and compressive strength of more than 160 MPa which are close to those of compact bones.
Poster-3 - Board: MNA-68 / 296
Synthesis Thermoelectric Material Mg2Si by Quartz Tube Vacuum Furnace from Starting Mg Powder and SiO2 Rice Husk
Author: Phonlakit Khowjalern1
1 Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladgrabang, Bangkok 10520, Thailand
Corresponding Author: [email protected]
Magnesium silicide (Mg2Si) is a promising for thermoelectric materials due to display a high perfor- mance for thermoelectric power generation with ZT about 0.9 at operation temperature 600 to 800 K. This work, Mg2Si compound was prepared from starting powder of SiO2, which was attracted from rice husk, and Mg powder. The sintering process was performed in quartz tube vacuum at temper- ature 650 ◦C with argon atmosphere. Then MgO composition was demolished by chemical process. XRD patterns showed the pure phased ofMg2Si. Thermoelectric characterization and properties will be reported.
Poster-3 - Board: MNA-12 / 80
Structural Investigation of Strontium Lead Silicate Glass Prepared from Silica Gel Waste Using Ultrasonic and FTIR Spectroscopy
Author: Pattaranipa Gunhakoon1
Co-author: Raewat Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
Preparation of the glass 6 samples in the system 10SrO – xPbO – (90 − x)Silica gel where x = 20, 25, 30, 35, 40 and 45 mol%. The principle of Archimedes was used to measure the density of theglass samples. The ultrasonic velocities of the glasses were determined at room temperature by usingpulse echo technique. The velocity data of the glass system have been used to find the elastic moduli.FTIR spectroscopy which measure in range 400-2000 cm−1 were used to study the structural properties of the glass samples. The results supported our discussion of the formation of NBO and BOinthe structural of glass systems.
Poster-3 - Board: MNA-05 / 41
Lifetime Span Comparison of Self-Cleaning Glass Annealed by Laser and Furnace Heat Treatments
Page 127 Siam Physics Congress 2015 / Book of Abstracts
Author: Arisara Panthawan1 Co-author: Pisith Singjai 1
1 Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
A self-cleaning glass was prepared by a sparking process. Specimens were coated with titanium oxide thin films, and were annealed by heating at500 ◦C using a laser and a furnace heat treatments. A lifetime span of the samples was tested by a rainfall simulator. Effect of the laser heat treatment for 10 mins was compared with that of a furnace heat treatment for 60 mins. It was found that water contact angles of the samples prepared by both conditions were approximately the same after accelerated test for 20 years. Furthermore, surface morphology of the samples before and after the tests was examined by atomic force microscopy and scanning electron microscopy. The results showed that the surface roughness of titanium oxide thin films after annealing with the laser and furnace heat treatments can be reduced from 18.39 nm to 8.99 nm and 9.81 nm, respectively. However, the glass transformation was not found in the samples annealed by the laser heat treatments.
Poster-3 - Board: MNA-72 / 314
Synthesis and Characterization of Iron-doped Hydroxyapatite by Sol–Gel Method
Author: Jutharatana Klinkaewnarong1 Co-author: Siraprapha Phusangad 1
1 Program in Physics, Faculty of Science, Udon Thani Rajabhat University
Corresponding Author: [email protected]
Nanoporous materials of Ca(10−x)Fex(PO4)6(OH)2 (FeHAp, x = 0, 0.1, 0.2, and 0.3) were successfully synthesized by sol–gel method. To obtain FeHAp, the prepared precursors were calcined in air at 600, 700 and 800 oC for 2 h. The samples were characterized by X–ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscope (TEM) observation. The XRD results confirm the formation of HAp phase with a small trace of beta-tricalcium phosphate phase. The crystallite sizes of the powder were found to be 30–60 nm as evaluated by theXRDline broadening method. The morphology of the samples was nanoporous particles of size less than 100 nm as evaluated by TEM. With increasing the Fe-substituted, the particle size of the FeHAp decreased.
Poster-3 - Board: MNA-18 / 91
The Effect of Calcination Temperature on the Properties ofthe NiO Films
Author: ADULPHAN PIMSAWAT1 Co-authors: Apishok Tangtrakarn 1; Sujittra Daengsakul 1
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
A NiO film was prepared by heating solution made of nickel acetate dissolved in acetic acidwhich were drop-casted on a fluorine-doped tin oxide (FTO) substrate. This simple preparation technique
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has rarely been investigated in the open literatures. The effect of heating temperatures from 250 ◦C to 500 ◦C on structural, morphological, electrical and capacitive properties of the films were eval- uated. With the increasing temperatures, there were improvement in the crystallinity of NiO and enlargement of NiO’s crystallite size, moreover, the films’ resistance increased whilst their capaci- tance values only slightly decreased. The optimum temperature suitable for preparing the NiOfilm was 300 ◦C, where the highest capacitance of 150−200 F/g were obtain for a symmetrical capacitor made from NiO electrode and 6 M KOH electrolyte solution.
Poster-3 - Board: MNA-56 / 240
Simulation and Design High-temperature Microwave Furnace for Thermoelectric Material Synthesis
Author: Direk Boonthum1
Co-authors: Arthit Panna 1; Chesta Ruttanapun 2; Mudtorlep Nisoa 1
1 Plasma technology for agricultural applications research laboratory, School of Science, Walailak University, Nakhon- sithammarat, THAILAND 80160 2 King Mongkut’s Institute of Technology Ladkrabang, Bangkok, THAILAND 10520
Corresponding Author: [email protected]
The thermoelectric is a device that can generate electric energy from solar and waste thermalen- ergies, and generate temperature gradient from electric energy for cooling applications. Recently, researchers are interested in the synthesis of thermoelectric material by microwave furnace. Be- cause the performance of thermoelectric materials are increased by microwave assisted synthesis method because of rapid sintering as leading to small gain size. High-temperature microwave fur- nace technology is complicated in the design and control system. The commercial high-temperature microwave furnaces are very expensive. In this research, we will develop high-power microwave furnace for synthesis of thermoelectric materials. The design of microwave furnace is optimized by Comsol multiphysics modeling of wave filed propagation in the waveguides and cavity. The waveg- uide modules are installed on all four sides of the square cavity. The microwave’s door has chokes for microwave field leakage protection. The boundary conditions of waveguides and cavity are perfect conductor. The results show that a cavity size is 28x28x28 cm. and the waveguides are installedto the opposite angle of 90 degrees to each other. The distribution of high intensity microwave radia- tion in the middle of a cavity and low intensity in the waveguide. The configuration and dimension of the chokes are determined. The fabrication of the furnace is in progress.
Poster-3 - Board: MNA-02 / 21
Micro-structural Investigation of InGaAsN Lattice-matched Films Grown on Off-angle Ge (001) Substrates by MOVPE
Author: Pornsiri Wanarattikan1
Co-authors: Kenjiro Uesugi 2; Kentaro Onabe 2; Sakuntam Sanorpim 3; Shigeyuki Kuboya 2; Somyod Denchitcharoen 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140 2 Department of Advanced Materials Science, The University of Tokyo 3 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
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In this work, the InGaAsN lattice-matched films were grown on off-angle Ge (001) substrates with inclined surfaces of 4◦ and 6◦ towards the [1 1 0] direction. All the samples were grown by metalor- ganic vapor phase epitaxy (MOVPE) using low temperature (550 ◦C) GaAs buffer layer. To compare the InGaAsN film on on-axis Ge (001) substrate, micro-structural properties of the films onoff-angle Ge (001) substrates were investigated by high-resolution X-ray diffraction (HRXRD), Raman scatter- ing, atomic force microscopy (AFM) and transmission electron microscopy (TEM). Since, InGaAsN with about 1-eV bandgap and lattice-matching to Ge is a candidate component material for theIn- GaP(N)/InGaAs/ InGaAsN/Ge four-junction-structure solar cells. HRXRD 2θ/ω (004) results showed the Pendellösung fringes which clearly indicate a flat interface and a smooth surface for the InGaAsN films on off-angle Ge substrates. Furthermore, the smooth surface with low RMS roughness wasob- viously observed by AFM. Cross-sectional dark-field TEM images showed the GaAs buffer layer with a few anti-phase domains (APDs) at the GaAs/Ge interface. And then, APDs-free InGaAsN layer was observed on the off-angle Ge substrates. On the other hand, both the InGaAsN films and theGaAs buffer layers on on-axis Ge substrates demonstrated a high density of anti-phase boundaries. Our results indicate that high structural quality InGaAsN lattice-macthed films were successfully grown on the off-angle Ge (001) substrates.
Poster-3 - Board: MNA-15 / 84
Effect of Temperature on Electrical Properties of BaCeO3 Ceram- ics
Author: Narongdetch Boothrawong1
Co-author: Gobwute Rujijanagul 2
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200 2 Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
In this work, BaCeO3 were prepared by a solid-state reaction method. BaCeO3 were calcined at 1300 ◦C for 10 h in air and sintered at various temperatures. Phase formation analysis by X-ray diffrac- tion technique (XRD) revealed that the samples exhibited a perovskite structure. The microstructural analysis indicated that grain size of the ceramics increased with sintering temperature due to higher different at a higher temperature. The dielectric constant of the ceramics tended to increasedwith the sintering temperature increase. In addition, complex impedance analysis was applied to deter- mine grain boundary and grain responses of the ceramics. The analysis suggested that the electrical properties of BaCeO3 depended on characteristics of grain and grain boundary.
Poster-3 - Board: MNA-43 / 179
Synthesis and Electrochemical Properties of SnO2 Nanostructures via a Hydrothermal Method for Li-ion Batteries.
Author: sunisa buekeaw1
Co-author: Nonglak Meethong 1
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khonkaen, THAILAND 40002
Corresponding Author: [email protected]
Tin oxide (SnO2) is one of the promising high capacity anode materials for next generation lithium ion batteries due to its ability to uptake a large amount of Li-ion. SnO2 can provide twice as high
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specific capacity as graphite electrode currently used in commercial Li-ion batteries today. There- fore, using SnO2 will reduce the amount of materials used to make the electrodes and reduces the production cost of the materials. In addition, the batteries made by using SnO2 as the anode will be lightweight and have small size. In this project, SnO2 was synthesized into three structures: nanopar- ticle, nanosphere and hollow nanosphere via hydrothermal method. The electrochemical properties were measurement using a galvanostatic mode. We found that the SnO2 nanoparticles provided the highest storage capacity due to its compacted structure with capsule-like nanostructure. The spe- cific capacity at C/5 of the first cycle was around 2200 mAh/g and the average capacity at1Cover20 cycles was around 660 mAh/g. These results indicate that SnO2 nanostructures synthesized in this work have a more superior performance than graphite and can be used to replace graphite electrode in lithium-ion batteries.
Poster-3 - Board: MNA-54 / 220
Study of Thermoelectric Structure Prepared by Hydrothermal Method
Author: Phitsamai KAMONPHA1
Co-author: Somkid PENCHAREE 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
Thermoelectric material is very important in the future, because the materials could beusedas renewable energy. The PbTe group material prepared by hydrothermal preparation method was ◦ studied. Thermoelectric AgPb18SbTe20 alloys were prepare by hydrothermal method at 180 C for 20 h from AgNO3, Pb(NO3)2, SbCl3 and TeO2 compounds and were dried in vacuum furnace for 6 h. The products were investigated by x-ray diffractometer (XRD). The patterns of PbTe intheplanes (200) and (220) were observed in the powder sample. Next parts, the powder will be prepared to bulk materials and investigated thermoelectric properties.
Poster-3 - Board: MNS-65 / 289
Raman scattering of the N-related vibrational modes in high N- content GaPN films grown on GaP (001) substrates by MOVPE
Author: Noppadon Toongyai1
Co-authors: Kentaro Onabe 2; Sakuntam Sanorpim 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330 2 Department of Advanced Materials Science, The University of Tokyo
Corresponding Author: [email protected]
The N related vibrational modes (N-RVMs) in high quality GaPN films (0 < N ≤ 5.4 at%) onGaP(001) substrates grown by metalorganic vapor phase epitaxy (MOVPE) have been investigated. This study used two sets of samples with different growth times of 5 min and 10 min. N contents, whichwere examined from high resolution X-ray diffraction (HRXRD) measurements, are 1.8 at%, 2.9 at% and 3.6 at% for growth time of 5 min and are 0.8 at%, 1.8 at%, 3.4 at% and 5.4 at% for growth time of 10 min. Mirror like surface and fairly flat interface were observed for all the films. Atomic force microscopy (AFM) images showed smooth surfaces with root mean square (RMS) roughness lower than 0.5 nm. These results suggest that the high quality GaPN films with high N contents were obtained, despite the fact that an incorporation of N is as high as 5.4 at%. Raman spectroscopy studies were performed
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to examine the effect of N incorporation on the vibrational modes of the GaP lattice. It isclearly observed that Raman spectra between 440 and 520 cm−1 were significantly influenced by theN incorporation, which is attributed to N-RVMs. Integrated Raman intensity ratio of N-RVMs with respect to GaP-LO phonon (at 401 cm−1) linearly increased with the N incorporation. Additionally, −1 the N-RVMs, which are attributed to the NNi-pairs, were remarkably appeared at 465 cm and 485 cm−1 for the films with N contents higher than 1.8 at%. While, local vibrational mode (LVM)ofthe isolated N-atoms on P sites was clearly observed near 500 cm−1.
Poster-3 - Board: MNA-22 / 108
Structural and elastic properties investigation of recycle silica gel glass by FTIR and ultrasonic technique
Author: Poonnaphob Sopapan1 Co-authors: Cherdsak Bootjomchai 2; Jintana Laopaiboon 2; Raewat Laopaiboon 2
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190 2 Glass Technology Excellence Center (GTEC), Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
The aim of this work was to study the structural and elastic properties of recycle silica gelglass (denoted as RSGG) using FTIR and ultrasonic technique. The 10CaO – xPbO – (90–x)silica gel glass system (where x = 20, 25, 30, 35, 40 and 45 mol.%) were prepared. In this work, the silica gel was acquired from silica gel degradation in our laboratory. Densities of glass samples with PbO content were measured by Archimedes’s principle using n-hexane as immersion liquid. The longitudinal and shear ultrasonic velocities were measured by using pulse echo technique of 4 MHz at room temper- ature. Densities data and the ultrasonic velocities data of glass samples were used for calculated the elastic properties such as longitudinal modulus, shear modulus, bulk modulus and Young’s modulus. The results shows that change in elastic properties of the glass samples depend on the concentration of PbO and this can be confirmed using FTIR techniques.
Poster-3 - Board: MNA-25 / 119
Synthesis, Optical and Magnetic Properties of CuCr1−xFexO2 De- lafossite Oxide
Author: Chutirat Taddee1 Co-author: Teerasak Kamwanna 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002; Integrated Nanotechnology Research Center (INRC), Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Delafossite CuCr1−xFexO2 (0.0 ≤ x ≤ 0.15) semiconductors were synthesized by self-combustion urea nitrate process. The effects of Fe concentration on microstructural, optical and magnetic prop- erties were investigated. X-ray diffraction (XRD) analysis results reveal the delafossite structure of all the samples. The lattice spacing of CuCr1−xFexO2 increased slightly with increasing substitu- tion of Fe at the Cr site. The optical properties at room temperature exhibited the transparent inthe visible region with direct optical band energy gap of 3.5 eV. The magnetic hysteresis loops measured at room temperature showed that the CuCrO2 samples exhibit paramagnetic behavior. However, a
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weak ferromagnetism property was found at the Fe-doped CuCrO2 samples up to 15%. The substi- 3+ 3+ tution of Cr by Fe produces a mixed effect on the magnetic properties of CuCrO2 delafossite oxide.
Poster-3 - Board: MNA-53 / 215
The Study of Spin Seebeck Effect on Iron Alloy.
Author: Champ Suksawat1 Co-authors: Poramed Wongjom 1; Supree Pinitsoontorn 2
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002; Thailand Center of Excellence in Physics (ThEP), CHE, Ministry of Education, Bangkok, THAILAND 10400
Corresponding Author: [email protected]
When a magnetized magnet is subjected to a temperature gradient, the difference types of electron spin are separated at both ends of sample. This phenomenon is called spin Seebeck effect (SSE). The tool for observing the SSE involves an inverse spin Hall effect (a conversion of spincurrentto charge current) by attaching a platinum stripe on the magnetic material. In this study, weobserved the SSE in iron alloy materials. The magnetic property of a sample was studied by vibrating sample magnetometer (VSM). The platinum stripes were coated on a surface of iron alloy by lithography evaporation technique. The thickness of the platinum stripe was measured by atomic force micro- scope (AFM). The morphology of a sample was studied by scanning electron microscope (SEM).The magnetic field and temperature dependence on the SSE were studied. The results show thatthesat- uration of a magnetized material is about 1000 Oe. The thickness of the platinum is about 10nm. We applied a magnetic flied to the sample in range from 0 to 2500 oersted. The study ofmagnetic flied dependence on the SSE was found at the hot side in contrast to the cool side. Theeffectsof temperature dependence on the SSE of the hot side and the cool side were clearly separated because the signals had opposite sign. However, in order to confirm the SSE on iron alloy, further studied need to be done to distinguish it from other contaminated signals such as Nernst effect.
Poster-3 - Board: MNA-73 / 341
Substrate Surface Orientation Dependent GaN Grown on GaAs by MOVPE
Author: Pitshaya Praigaew1 Co-authors: Kentaro Onabe 2; Noppadon Nuntawong 3; Sakuntam Sanorpim 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330 2 Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan 3 National Electronics and Computer Technology Center (NECTEC), 112 Thailand Science Park, Phahonyothin Rd., Klong 1, Klong Luang, Pathumthani, THAILAND 2120
Corresponding Author: [email protected]
This work presents a comparative study on the effect of substrate surface orientation onthegrowth of GaN by metalorganic vapor phase epitaxy (MOVPE). GaN films was successfully grown on both the (001)- and (110)-oriented GaAs. With compared to GaN on (001)-oriented GaAs, GaN on (110)- oriented GaAs showed a flat surface and a smooth interface. Root mean square roughness (RMS) measured by atomic force microscopy (AFM) was 61.1 nm and 10.3 nm for the films on (001) and (110)-oriented GaAs, restively. Structural characterization of GaN on (001)-oriented GaAs, which was performed by X-ray diffraction (XRD), exhibited a metastable cubic structure, which slightly
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contained stacking faults (SF), indicating a generation of hexagonal structure. On the other hand, a mixed structure between cubic and hexagonal structures was observed for the GaN on (001)-oriented GaAs. In order to verify a specific crystal structure, micro-Raman scattering spectroscopy was per- formed with two different excitation wavelengths of 514 nm and 633 nm. Raman spectra showed −1 −1 phonon modes of cubic-TO at 556 cm and hexagonal E2-high at 569 cm for both excitation wavelengths. It was found that phonon mode, corresponding to hexagonal A1 (TO), was observed at 535 cm−1 when the excitation wavelength of 514 nm was used. While, Raman spectra with the excitation wavelength of 633 nm did not show the presence of this phonon mode. Furthermore, when the excitation wavelength was changed from 514 nm to 633 nm, Raman scattering peak at 736 −1 cm , which is a signature of hexagonal A1 (LO), was slightly shifted to the cubic-LO phonon at740 cm−1 . Our results verify that substrate surface orientation a key parameter used to control crystal structure of GaN
Poster-3 - Board: MNA-01 / 8
CdS/CdSe Co-sensitized on Different TiO2 Morphologies and its Application to Quantum Dot-sensitized Solar Cells (QDSSCs)
Author: Nattha Buatong1 Co-authors: Wararat Montha 1; Weeraphat Pon-On 1
1 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
With power conversion efficiency in continuous growth, quantum dot-sensitized solar cells (QDSSCs) are recently under high interest; however there is no such perfect cell yet developed for these devices. As the fundamental model of QDSSCs, the morphology of the TiO2 photoanode plays an important role in photovoltaic performance. Herein, the TiO2 films based on nanorods (TiR) and arrays of nanorods having flower blossom-like formations on their surface (FTiR) were synthesized by one- and double-step hydrothermal process, respectively. The CdS and CdSe co-sensitized on TiR and FTiR were deposited by using the successive ion layer absorption and reaction (SILAR) and chemical bath deposition (CBD). To study conversion efficiency, FTiR after CdS/CdSe co-sensitized has shown the improving conversion efficiency (η) compared with TiR photoanode. The efficiencies of CdS/CdSe co-sensitized loading were 0.703% and 0.022% for FTiR and TiR photoanodes, respec- tively. This study revealed a synergistically beneficial effect (enhanced solar-to-current conversion) of the flower blossom-like formations on the nanorods in CdS/CdSe co-sensitized solar cells.
Poster-3 - Board: MNA-26 / 122
Effect of Fabrication Method on the Structural and Magnetic Prop- erties of Copper Ferrite
Author: Siriwipa Pongpadung1 Co-author: Teerasak Kamwanna 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002; Integrated Nan- otechnology Research Center (INRC), Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Copper ferrites (CuFe2O4) were fabricated by self-combustion urea and glycine process (UNP, GNP), polymerized complex (PC), solid-state reaction (SSR), and molten-salt (MS) methods. The synthe- sized powders were calcined in static air at different temperature from 500 – 900◦C. The effects of the
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fabrication method on the microstructural and magnetic properties were investigated. X-ray diffrac- tion (XRD) analysis results revealed the cubic CuFe2O4 spinel structure for UNP and MS samples and tetragonal CuFe2O4 spinel structure for GNP, PC, and SSR samples. Scanning electron microscopy (SEM) investigation showed that the synthesized ferrite is made up of very fine nanoparticles. By using vibrating sample magnetometer (VSM) technique, a significant change in the magnetic prop- erties was absorbed in CuFe2O4 system with fabrication method and heat treatment. The magnetic hysteresis loops measured at room temperature showed that the saturation magnetization increases with increasing calcinations temperature, whereas the coercivity values decrease.
Poster-3 - Board: MNA-07 / 56
Sonochemical Synthesis of ZnO Nanospheroid
Author: Chat Pholnak1 Co-authors: Monthon Lertworapreecha 2; Sumetha Suwanboon 3
1 Department of Physics, Faculty of Science, Thaksin University, Phatthalung, THAILAND 93210 2 Department of Biology, Faculty of Science, Thaksin University, Phatthalung, THAILAND 93210 3 Department of Materials Science and Technology, Faculty of Science, Prince of Songkhla University, Hat Yai, THAI- LAND 90112
Corresponding Author: [email protected]
Spheroidal ZnO nanostructures were synthesized by ultrarapid sonochemistry using 0.1 M zinc nitrate (Zn(NO3)2) and 0.2 M sodium hydroxide (NaOH) aqueous solution. These chemical solu- tions were sonicated under ambient conditions without any template, surfactant, and chelating agents. Only 30 min was needed to complete the formation of highly crystallized nanospheroids. As- prepared ZnO products were characterized by powder X-ray diffraction (XRD) and scanning electron microscope (SEM). The results reveal that spheroidal structures possess a hexagonal wurtzite struc- ture with diameters between 60 and 230 nm. Both concentration of the precursors and ultrasonic irradiation time played a critical roles for formation and optical properties of ZnO nanospheriods. The room temperature photoluminescence (PL) spectra showed a UV emission peak at around 390 nm and a broad visible emission band at around 650 nm. These spheroidal nanostructures may promising applications in anti-aging, anti-microbial, and photocatalytic activities.
Poster-3 - Board: MNA-62 / 259
Effect of Eu3+ Concentration on Crystallization and Luminescence Properties of CaO-MgO-Al2O3-SiO2-ZnO Glass-Ceramics
Authors: Anuson Niyompan1; Wipada Senanon1 Co-author: Rungnapa Tipakontitikul 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
3+ Eu -doped glass-ceramics were prepared in the system CaO-MgO-Al2O3-ZnO-SiO2. Crystalliza- tion and luminescence properties of the glass-ceramics were studies by XRD, SEM, and fluorescence spectroscopy. After the heat treatment at the appropriated conditions, the crystalline phasefound in the glass-ceramics was diopside (CaMg(SiO3)2) and Mg(Si2O6). There was no pronounced ef- fect on the phase type due to presence of the Eu3+ impurity. Participation of the doping content slightly altered the glass-ceramics microstructure. However, the fluorescence spectra determined from glass-ceramics with addition of Eu3+ ions have shown the involvement of the diopside phase during phosphorescence process. With aided by Eu3+ ions, a much stronger emission spectra was
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observed comparing to that of the corresponding glass. Increases of Eu3+ concentration also give glass-ceramics with stronger emission of the light in red region.
Poster-3 - Board: MNA-67 / 294
The Effect of CaO from Cassava Rhizome to Structural and Elastic Properties of Strontium-borate Glass Systems
Author: Raewat Laopaiboon1
Co-authors: Cherdsak Bootjomchai 2; Jintana Laopaiboon 1; Laddawan Singsawat 3
1 Department of Physics, Faculty of Science, Ubon Ratchatani University, Ubon Ratchatani, THAILAND 34190 2 1Department of Physics, Faculty of Science, Ubon Ratchatani University, Warinchamrab, Ubon Ratchatani, 34190, Thailand; 2Glass Technology Excellent Center (GTEC), Faculty of Science, Ubon Ratchathani University, 34190 Thailand 3 1Department of Physics, Faculty of Science, Ubon Ratchatani University, Warinchamrab, Ubon Ratchatani, 34190, Thailand
Corresponding Author: [email protected]
The glass system of xCaO - (50-x)SrO – 50B2O3 (x = 0, 10, 20, 30, 40 and 50 wt.%) were prepared using the conventional melt quenching technique. In this work, the calcium oxide was acquired from Cassava Rhizome. Elastic properties of the glasses were determined at room temperature by measuring ultrasonic velocities (both longitudinal and transverse) at a frequency of 4 MHz. The den- sity of glass samples were measured by Archimedes’ principle using n-hexane as the buoyant liquid. From these obtained velocities and densities, Elastic moduli were calculated. All of these parame- ters were depend upon the CaO concentration. The structural properties of the glasses sample were studied by using Fourier Transform Infrared spectroscopy (FTIR). The obtained results supported our discussion of the formation bridging oxygen (BO) and non-bridging oxygen NBO).
Poster-3 - Board: MNA-66 / 291
Controlled Growth of ZnO Nanostructures in Hydrothermal Pro- cess on ZnO Seeds Layer Synthesized with Different Precursor Concentrations
Author: Nontakoch Siriphongsapak1
Co-authors: Pichet Limsuwan 1; Somyod Denchitcharoen 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140.
Corresponding Author: [email protected]
Zinc oxide (ZnO) nanorods and nanosheets were grown via hydrothermal process on ZnO seed layers synthesized by spin-coating technique on silicon and glass substrates with different precursor concentrations of zinc acetate dihydrate. The concentrations of zinc acetate dihydrate in solution were varied from 6 mM to 500 mM. The ZnO seed layers, ZnO nanorods, and ZnO nanosheets were characterized by field-emission scanning electron microscope (FESEM) and X-rays diffractometer (XRD) to study morphology and crystallographic structure, respectively. The results showed that particle size and diffraction pattern of ZnO seed layers changed with various precursor concentration. Moreover, different precursor concentration affected the change of ZnO morphology from nanorods to nanosheets.
Page 136 Siam Physics Congress 2015 / Book of Abstracts
Poster-3 - Board: MNA-37 / 164
Influence of LiSbO3 on Microstructure and Electrical Properties of Bi0.5(Na0.80K0.20)0.5TiO3 Ceramics
Author: Pimpilai Wannasut1
Co-authors: Anucha Watcharapasorn 1; Pharatree Jaita 1; Sukanda Jiansirisomboon 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
This research studied the effect of LiSbO3 on microstructure and electrical properties of lead-free Bi0.5(Na0.80K0.20)0.5TiO3 ceramics with the composition belonging to Bi0.5(Na0.80K0.20)0.5TiO3- LiSbO3 or (1-x)BNKT-xLS(when x = 0, 0.005, 0.010, 0.015, 0.020 mol fraction). The BNKT-LS ce- ramics were prepared by a conventional mixed oxide method and sintered at 1100◦C for 2h. X-ray diffraction pattern of all compositions exhibited a single perovskite structure without impurity phase. Scanning electron microscopy (SEM) was used to determine the microstructure of ceramics. Pure BNKT ceramic promoted a formation of cubic-like shape grains with an average grain size of 0.25 ± 0.05 mm. With increasing LS concentration, average grain size value gradually increased and showed the maximum value of 0.34 ± 0.10 mm at x = 0.02. The addition of LS into BNKT ceramic did not obviously change grain morphology, however, it caused fracture surface to switch from mixed inter-transgranular fracture for pure BNKT to mainly transgranular fracture for LS-added samples. A large room temperature dielectric constant of 1367 and dielectric loss of 0.0435 were observed for BNKT-0.015LS sample.
Poster-3 - Board: MNA-50 / 199
WS2 Nanoparticles and Multiwalled Carbon Nanotubes Counter Electrode for Dye-sensitized Solar Cells
Author: Ladavan Kaewphaisan1
Co-authors: Samuk Pimanpang 2; Viyada Harnchana 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
WS2 nanoparticles and multiwalled carbon nanotubes (MWNTs) were hydrothermally prepared and used as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The highest energy conver- sion efficiency of 6.69 % was achieved from the produced WS2/MWNT CE, closely comparable to that of the Pt CE which was 7.34 %, whereas the pure MWNT based DSSC gave the efficiency of 5.2 %. The WS2 nanoparticles therefore played a crucial role in this enhanced cell efficiency. This superior efficiency was attributed to the combination of the high catalytic activity oftheWS2 nanoparticles and the high electric conductivity of the MWNTs, which were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurement, respectively.
Poster-3 - Board: MNA-32 / 147
Crystallization and Dielectric Properties of Nd3+ Doped Ferro- electric Glass-Ceramics in the Na2O-BaO-Nb2O5-SiO2 System
Page 137 Siam Physics Congress 2015 / Book of Abstracts
Authors: Anusorn Niyompan1; Paitoon Boonsong1
Co-author: Rungnapa Tipakontitikul 1
1 Advanced Ceramics Laboratory, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
Ferroelectric glass-ceramics of the Na2O-BaO-Nb2O5-SiO2 system were obtained from controlled crystallization process performed on the parent glass of composition 20Na2O-10BaO-30Nb2O5-40SiO2. Nd2O3 doping content was varied in the range 0, 0.1 and 0.5 mol%. The glass samples were prepared via a conventional melting method at 1500 ◦C in the platinum crucible for 2 hr following by splashed- quenching on the stainless steel plate. Thermal properties of the as-quenched sample were studied by DTA/TG technique and the results showed the possible crystallization peak at 740 ◦C and this was selected as the treatment temperature. Heat treatment process was employed for production of glass-ceramic which is performed in the electrical furnace at selected temperature. The obtained glass-ceramic specimens were investigated in terms of the crystalline phase formation, volume frac- tion, bulk density and dielectric properties. The results of phase identification using XRD revealed that NaNbO3 and Ba2NaNb5O15 were the dominant crystalline phases for all doped samples. The volume fractions of the crystallites are noticeably increased with the Nd2O3 content. Bulk densities of the glass-ceramic samples are higher than that of the related as-quenched glass. The dielectric constants measured at room temperature at various frequencies for doped glass-ceramics seemed to be affected by the presence ofNd3+ ion.
Poster-3 - Board: MNA-16 / 86
Influences of Sn Doping and CaTiO3 Volume Fraction on Microstruc- ture and Electrical Response of Sn-doped CaCu3Ti4O12/CaTiO3 Composites
Author: Jutapol Jumpatam1
Co-authors: Prasit Thongbai 2; Santi Maensiri 3; Teerapon Yamwong 4
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 3 School of Physics, Institute of Science, Suranaree University of Technology, Nakorn Ratchasima, THAILAND 30000 4 National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
The influences of Sn doping concentration and CaTiO3 volume fraction on microstructure and elec- trical response of Sn-doped CaCu3Ti4O12/CaTiO3 composites prepared from a nominal formula of Ca1+xCu3−xTi4−ySnyO12 (where x = 0, 0.5, 1 and 1.5; y = 0.05 and 0.30) were investigated. The dielectric properties of CaCu3Ti4O12/CaTiO3 composites were measured as functions of frequency and temperature. The n-type semiconducting grains of CaCu3Ti4O12 phase and insulating inter- faces between CaCu3Ti4O12-CaCu3Ti4O12 grains and CaCu3Ti4O12-CaTiO3 grains were studied by an impedance spectroscopy technique. The microstructure of Ca1+xCu3−xTi4−ySnyO12 ceram- ics was slightly changed with increasing CaTiO3 volume fraction. The dielectric properties were strongly affected by Sn content and the volume faction of CaTiO3. At 1 kHz, the dielectric constant (ε′) increased with increasing Sn doping concentration. It was also found that ε′ decreased with increasing CaTiO3 volume fraction. The activation energy for conduction within the grains slightly increased with increasing the Sn content; whereas, the activation energy for conduction at the in- ternal interfaces decreased slightly. Interestingly, it was found that Egb increased significantly with increasing CaTiO3 volume fraction.
Page 138 Siam Physics Congress 2015 / Book of Abstracts
Poster-3 - Board: MNA-17 / 87
Gamma-ray Shielding and Structural Properties of P2O5-BaO-Bi2O3 Glass System
Author: Sarinthonthep Sainet1
Co-author: Raewat Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
Fabrication of a (50)P2O5 - (50-x)BaO - (x)Bi2O3 glass systems where x = 0, 2.5, 7.5, 12.5 and 17.5 mol% was carried out using a conventional melt-quenching method. The glass system has been in- vestigated to see its potential use as radiation shielding material. The glass density was measured by using Archimedes principle. The micro-hardness of glasses was determined by ultrasonic velocities. The ultrasonic velocities were measured by the pulse echo technique, with a frequency of4MHz and at room temperature. FTIR spectroscopy has been used to study the structural properties of the prepared glass systems. The HVL (Half-Value Layer) show that this glass system is suitable as radiation shielding material and has some advantages comparing to the standard radiation shielding concrete.
Poster-3 - Board: MNA-39 / 173
Characterization and Magnetic Properties of Fe-doped MgO Nanopar- ticles
Author: Sumalin Phokha1
Co-authors: Kornkanok Boonserm 2; Santi Maensiri 3; Sitchai Hunpratub 4
1 Department of Physics, Faculty of Science, Udon Thani Rajabhat University, Udon Thani, THAILAND 41000 2 Department of Applied Chemistry, Faculty of Science and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, THAILAND 30000 3 School of Physics, Institute of Science, Suranaree University of Technology, Nakorn Ratchasima, THAILAND 30000 4 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Fe-doped MgO (Mg1−xFexO, x = 0, 0.05, and 0.07) nanoparticles synthesized by the polymer pyrol- ysis method were investigated. The precursors were calcined at temperatures of700 ◦C for 3 hours in air to obtain the phase of MgO. X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray absorption near edge spectroscopy (XANES), and vibrating sample magnetometry (VSM) were used to characterize phase, morphology, valence states and magnetic properties of the samples. The samples had a phase of the face centered cubic with crystallite sizes of 25 ± 2 nm. The result of XANES spectra showed that the Fe3+ exists in the samples. The weak ferromagnetic (FM) behavior at room temperature (RT) is observed for all Mg1−xFexO samples with a maximum magnetization of 1.30 emu/g for x = 0.07. The origin of ferromagnetism of the prepared Mg1−xFexO samples was discussed.
Poster-3 - Board: MNA-70 / 303
Formation and Structure of ZrO2 Added Hydroxyapatite Synthe- sized from Waste Eggshells
Page 139 Siam Physics Congress 2015 / Book of Abstracts
Author: Aekgaran Sangmala1
Co-authors: Ekachai Hoonnivathana 2; Kittisakchai Naemchanthara 1; Pichet Limsuwan 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
Stabilized zirconia (ZrO2) added hydroxyapatites were synthesized from waste eggshells at different percent weigh from 1 to 15 with an increment 2 percent weight by precipitation method. The samples were dried at 100 ◦C for 48 h, grounded with pestle and mortar into powder and heated from 200 to 1300 ◦C. Structure properties of samples before and after heated were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The XRD results show that the samples composed hydroxyapatite and tetragonal zirconium dioxide (t-ZrO2) phase. Hydroxyapatite phase was transformed to tricalcium phosphate (TCP) phase ◦ ◦ after heated at 700 C. At 1300 C, the sample had 3 phase of TCP, t-ZrO2 and CaZrO3 phase. The composited of samples were confirmed by FTIR results. The morphology and dispersive particle of samples were investigated by SEM.
Poster-3 - Board: MNA-71 / 306
Preparation and Characterization Chitosan/Hydroxyapatite Com- posites from Waste for Bio-applications
Author: Chalongwut Boonpratum1
Co-authors: Ekachai Hoonnivathana 2; Kittisakchai Naemchanthara 1; Pichet Limsuwan 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, THAILAND 10140 2 Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
In this research, chitosan/hydroxyapatite (HAp) composites were prepared using precipitation method. The calcium oxide from waste chicken eggshells as a calcium source was mixed with nitric acid.Chi- tosan of shrimp solution different percent weight from 1 -15 were added to phosphate solution. The both of the solution were mixed, stirred for 6 h, precipitate forming a chitosan/HAp composite and annealed at 100 ◦C for 4 h. The structure properties and morphologies of composites were investi- gated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning elec- tron microscopy (SEM). The results showed that the crystal structure of composites was decreased with increased %wt of chitosan. FTIR was used to investigate the major transmitting bands of all HAp and chitosan. The amounts of chitosan were increased as increased the particle size ofcompos- ites. These experiments showed that the chitosan can be mixed into hydroxyapatite for composites material.
Poster-3 - Board: MNA-57 / 241
Phase Transition of LiMn0.85Cr0.15PO4 Cathode Material by In-Situ Time-Resolved XANES
Authors: Nonglak Meethong1; Sarawut Pongha1
Co-authors: Sutham Srilomsak 2; Wanwisa Limpirat 3
Page 140 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Nanotec-SUT Center of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000 3 Synchrotron Light Research Institute, Nakhon Ratchasima, THAILAND 30000
Corresponding Author: [email protected]
Lithium metal phosphate olivine (LiMPO4; M= Fe, Mn, Co, Ni) have a great deal of attention as one of the promising cathode material for lithium ion batteries. To date, a considerable number of studies have enhanced the electrochemical behavior of LiFePO4 from being barely electrochemically active to having a full capacity at high rates. Based on the success of LiFePO4, an increasing number of research groups have focused their attention on LiMnPO4, which exhibits an obvious advantage + over LiFePO4 with a redox potential of 4.1 V VS Li/Li . However, the LiMnPO4 kinetics is unusually sluggish due to its intrinsically low ionic and electronic conductivity. Many techniques, including to carbon coating, nano-sized using and aliovalent doping have been done to improve rate capability 3+ of this material. The doping of LiFePO4 with Cr has been investigated in several previous studies which show an enhancement in conductivity and rate performance. However, the Cr-associated mechanism during charge/discharge is not yet revealed. Here, we report phase transition investiga- tion of LiMn0.85Cr0.15PO4 cathode material by in-situ time-resolved XANES.
Poster-3 - Board: MNA-20 / 104
Education fuel pellets made from cassava and coffee grounds.
Author: Kamonrat Wongsamat1
Co-author: Jintana Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University
Corresponding Author: [email protected]
The purpose of this research is to study the biomass fuel pellets. With cold compressed techniques high pressure. The main raw material used in the experiment are cassava and coffee grounds.Cas- sava was crushed and coffee grounds is baked and gliding grinded and sieved in the grain sizeofa 300 - 2000 μm. The samples were mixed with cassava and coffee grounds ratio of 10: 0, 9:1,8:2,7: 3, 5: 5, 7: 3 and 0:10 and compressed with a compression ratio of 5 , 10 and 15 tons/cm2. The cassava flued pellets sample were studied the properties of calorific value and compressive stregh. Experi- mental results on the cassava and coffee grounds to test the calorific value with a bomb Calorimeter is 3571.40 and 5236.70 cal / g. Keywords: Cassava, coffee grounds, fuel pellets , Compressive strength
Poster-3 - Board: MNA-58 / 244
Fabrication of Porous Ceramics for Controlling the Release of Bioactive Compounds in Combating Bee Parasites in Bee Hive
Author: Uraiwan Intatha1
Co-authors: Nattaya Tawichai 1; Sukum Eitssayeam 2
1 School of Science, Mea Fah Luang University, Chiang Rai, Thailand 57100 2 Department of Physics and Material Science, Faculty of Science, Chiang Mai University 50200
Page 141 Siam Physics Congress 2015 / Book of Abstracts
Corresponding Author: [email protected]
Porous ceramics are studied for natural extracts packaging application to control bee mites. Firstly, the amount of starting precursors such as cellulose (pore former) and PVP (surfactant) are varied to find the suitable preparing condition. The ratio of cellulose and PVP are affected bydensity and porosity of ceramic. The best ceramic condition is cellulose 10 g and PVP 3 cc with90.54% porosity. Second, the effects of lemongrass oil on Varroa jacobsoni and Tropilaelaps mercedesae mites are studied in laboratory scale. The % corrected mortality of V. jacobsoni mites and T. mercedesae mites were reported 100 %. However, controlled conditions have less that 25 % of corrected mortality. Finally, the effects of lemongrass oil on bees are studied. The lemongrass oil has no effectstobee population. The porous ceramics could be used to release lemongrass oil up to 30days.
Poster-3 - Board: MNA-04 / 31
Photocatalytic Properties of Hydrogenated Titanium Dioxide Thin Films Prepared by Sparking Method
Author: Porntipa Pooseekheaw1
Co-author: Pisith Singjai 1
1 Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
Titanium dioxide (TiO2) is a widely used photocatalyst in water splitting process for hydrogen pro- duction. In this study, hydrogenation of the titanium dioxide thin films was investigated in order to examine the photocatalytic properties and to improve the performance for photoactivity. Titanium dioxide thin films were prepared by sparking method, then annealed at500 ◦C in hydrogen atmo- sphere to get hydrogenated titanium dioxide thin films (H:TiO2). The result of scanning electron microscopy and atomic force microscopy showed that the thickness of films was 2 µm. The film was porous with high specific surface area which promotes good photocatalytic activity. UV-Vis-NIR spectrometer measurement indicated that the sunlight absorbance of H:TiO2 was more than the ab- sorbance of TiO2. For these results suggest that H:TiO2 has better photocatalytic properties than the TiO2.
Poster-3 - Board: MNA-03 / 30
Synthesis and Characterization of Vanadium Oxide Film by Spark- ing Method for Thermochromic Application
Author: Winai Thongpan1
Co-author: Pisith Singjai 1
1 Materials Science Research Center, Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
Vanadium dioxide (VO2) has a great potential to be utilized as thermochromic glazing for improv- ing the energy efficiency of buildings. The famous semiconductor-to-metal phase transition (SMT) property of VO2 shows the reversible optical properties when the temperature is above the critical ◦ point at 68 C. In this work, VO2 films were prepared by sparking method on glass substrates and ◦ annealed for 2 – 6 hours at 300 – 500 C. Thickness of2 VO films was varied from 100 to 500 nmby increasing the sparking cycles. The surface morphology of samples was analyzed by atomic force
Page 142 Siam Physics Congress 2015 / Book of Abstracts
microscopy and scanning electron microscopy. The solar reflectance and transmittance were investi- gated by UV-Vis-NIR spectroscopy. The results show that the roughness of the films was decreased by rising the annealing temperatures and the near-infrared transmittance trend of products were dropped down by controlling the working temperatures from 30 to 90 ◦C.
Poster-3 - Board: MNA-08 / 66
Characterization of Ce1−xPrxO2 was Synthesized by a Co-precipitate Method.
Author: Pilan Ngiewlay1 Co-author: Apishok Tangtrakarn 2
1 Department of Material Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen, THAI- LAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Ce1−xPrxO2 (x = 0, 5, 10, 15 and 20) was synthesized by a co-precipitate method. The crystallization temperature started around 300 ◦C. After calcination at 800 ◦C for 8 hr, the grains size of undoped sample was about 69 nm. Doping Pr into CeO2 resulted-in the reduction to grains size. The small- est grains size of 40 nm was observed for Ce0.8Pr0.2O2. Incorporation of Pr into ceria lattice was confirmed from the increased in lattice parameter and oxygen vacancy. Moreover the area intensity ratio of ceria main peak over the vacancy peak was reduced with the increasing dopant. Ce0.8Pr0.2O2 have the highest conductivity of 0.01 S/cm above 600 ◦C.
Poster-3 - Board: MNA-09 / 69
Effect of Annealing on Magnetic Properties1 ofSrTi −xCoxO3 Nanopar- ticles Prepared by Hydrothermal Method
Author: Attaphol Karaphun1 Co-author: Ekaphan Swatsitang 2
1 Department of Material Science and Nanotechnology, Faculty of Science, Khon Kaen University, Khon Kaen, THAI- LAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
Co-doped SrTiO3 (SrTi1−xCoxO3)(x=0, 0.05, 0.1 and 0.15) nanopowders were synthesized by hy- drothermal method. Their morphology and structure were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Magnetic properties were measured at room temperature using vibrating sample magnetometer (VSM). All samples show the major phase of a perovskite structure and the nanopowders consist of cubic-like particles with particle sizes in the range of 60- 120 nm. As-synthesized samples exhibit paramagnetic behavior and display the completed saturation ferromagnetic for samples annealed in Argon atmosphere at 800 ◦C for 3 h. The ferromagnetic behavior in the annealed sample with x = 0.15 is due to the impurity phase of CoO. However, for annealed samples with x = 0.05 and 0.1, the observed ferromagnetic behavior is originated from the F-center mechanism. The saturation magnetization of annealed samples with x = 0.05 and 0.1 are 0.048 and 1.080 emu/g, respectively.
Page 143 Siam Physics Congress 2015 / Book of Abstracts
Poster-3 - Board: MNA-40 / 175
Effects of Substrate Materials on Optical Behavior of ZnO:Al Film Prepared by RF-sputtering
Author: Jantree Kheanwong1 Co-author: Watcharee Rattanasakulthong 1
1 Department Department of Physics, Faculty of Science, Kasetsart University, Bangkok, THAILAND 10900
Corresponding Author: [email protected]
Aluminum-doped ZnO (ZnO:Al) film was deposited by RF-sputtering on different substrates (glass, B-PTFE and W-PTFE). From SEM photographs, the thickness of sputtered ZnO:Al films was about 90 nm. XRD measurements confirms that sputtered ZnO:Al films show ZnO:Al phase in (002) direction. Peak intensity of ZnO:Al phase obviously depends on the type of substrate materials. The highest and lowest peak intensities were observed on the films deposited on glass and B-PTFE substrates, respectively. AFM result reveals that surface roughness of the films on glass substrate shows the lowest value and on W-PTFE substrate shows the highest value. Electrical resistance of the film on glass is about 27 Ω while on B-PTFE and W-PTFE substrates are the same value of about 26 Ω. The average optical transmission in visible region of the film on glass, B-PTFE and W-PTFE substrates is 80, 60 and 18%, respectively. However, the film on B-PTFE substrate reaches the maximum optical transmission of about 80% in the second near-infrared region. The results imply that the optical properties of sputtered ZnO:Al film can be changed by the type of substrate materials.
Poster-3 - Board: MNA-41 / 177
Fabrication of Electrospun LiFePO4/Carbon Composite Fibers as a Cathode Material for Lithium-ion Batteries
Author: Rattiya Hongtong1 Co-author: Nonglak Meethong 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAI- LAND 40002; Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002; Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
LiFePO4/Carbon composite fibers were synthesized by using a combination of electrospinning and sol-gel techniques with LiOH•H2O, FeSO4•7H2O, H3PO4 and citric acid. Polyvinylpyrrolidone (PVP: 1,300,000 g.mol−1) was used as the fiber-forming agent in the electrospinning method and a car- bon source for improving electronic conductivity of LiFePO4. Surface morphology and carbon coat- ing features of the composite nanofibers were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray energy dispersive spectroscopy microanalysis (EDS). The electrochemical performance of LiFePO4/carbon composite fibers were evaluated using galvanostatic charge- discharge method.
Poster-3 - Board: MNA-42 / 178
Effect of Annealing in Reducing Atmosphere on Dielectric Prop- erties of CaCu3Ti4O12/CaTiO3 Composites
Page 144 Siam Physics Congress 2015 / Book of Abstracts
Author: Theeranuch Nachaithong1 Co-author: Prasit Thongbai 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
The influence of annealing in Ar on the dielectric properties ofCaCu3Ti4O12/CaTiO3 (CCTO/CTO) composites prepared by a solid state reaction method was studied. The phase composition and the mi- crostructure were characterized by X-ray diffraction and scanning electron microscope with energy dispersive X-ray spectrometry, respectively. High dielectric permittivity values (2300−3000) with low loss tangent (0.01−0.03) at 1 kHz and room temperature were achieved in the CCTO/CTO com- posites. The dielectric permittivity was nearly independent on frequency in the rangeof100−100000 Hz. Interestingly, the dielectric permittivity of the CCTO/CTO composites was largely reduced by annealing the sample in Ar atmosphere; while the low-frequency loss tangent value was largely in- creased. These results indicated to the decrease in the total resistance of the internal interfaces, i.e., CCTO-CCTO and CCTO-CTO interfaces. The dielectric behavior of the CCTO/CTO composites can be well explained based on the Maxwell-Wagner polarization at the internal interfaces.
Poster-3 - Board: MNA-48 / 188
Synthesis Thermoelectric Material Mg2Si by Quartz Tube Vacuum Furnace from Starting Mg Powder and SiO2 Rice Husk
Author: Phonlakit Khowjalern1
1 Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, THAI- LAND 10520
Corresponding Author: [email protected]
In this work, magnesium silicide (Mg2Si) compounds were prepared by solid state reaction with sin- tering in quartz tube vacuum. Ball milling process is used in the mixture of magnesium (Mg) powder and pure silica obtained from thermal decomposition of rice husks. After that, the powder sample were sintered at 650◦C for 60, 120 and 180 minutes in quartz tube vacuum with argon atmosphere. The XRD patterns show the peak ofMg2Si and MgO was dominant with all conditions. Subsequently, the chemical process to get rid of MgO.
Poster-3 - Board: MNA-38 / 165
Synthesis of Gold Nanorods with Different Aspect Ratios for Sens- ing Applications
Authors: Apiwat Chompoosor1; Atcha Kopwitthaya2; Sawinee Ngernpimai1
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 National Electronics and Computer Technology Center (NECTEC), Thailand Science Park, Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
Gold nanorods show great potential in applications such as imaging, drug delivery, photothermal therapy and biosensing. The optoelectronic properties strongly depend on their sizes and shapes.
Page 145 Siam Physics Congress 2015 / Book of Abstracts
In this work, gold nanorods with different aspect ratios are synthesized by a seed-mediated growth method. The gold seeds are prepared by the reduction of Gold (III) chloride trihydrate (HAuCl4) with sodium borohydride (NaBH4) and cetyltrimethylammonium bromide (CTAB). In the growth process, the role of silver ion and pH on the formation of rod shapes is investigated. The gold nanorods are characterized using transmission electron microscopy (TEM) and UV-visible spectroscopy. The results show that the amount of silver ion yields gold nanorods with different aspect ratios. At high concentration of silver ion, the rectangular shape is observed. In the presence of hydrochloric (HCl) solution, the growth rate of gold nanorods is lowered. The gold nanorods are observed in higher aspect ratio. The localized surface plasmon resonance (LSPR) wavelength of the gold nanorods are shown at 520 nm and 740 nm, corresponding to the transversal and longitudinal plasmon resonance, respectively. The aspect ratio of nanorods can be tailored by varying the amount of silver ionand acidic condition. This method could be used to selectively produce gold nanorods with different sizes and shapes for sensing application.
Poster-3 - Board: MNA-36 / 160
Preparation and dielectric properties of poly (vinylidenefluoride hexafluoropropylene) fibers
Author: Kanokwan Nawaka1 Co-author: Chatchai Putson 1
1 Prince of Songkla University
Corresponding Author: [email protected]
Electrospinning technique has been greatly interested to fabricate nanoscale fibers due to its ease of preparation and adjustment. In this project, the objective is to design and construct the electrospin- ning setup to replace the high cost and imported electrospinning apparatus. Poly (vinylidenefluoride hexafluoropropylene; P(VDF-HFP)) was used a model polymer to produce fibers to study theeffect of fabrication and parameters on morphology and average sizes of fibers, including the distances between tip and collector (9, 10, 11, 12 and 13 cm) and polymer concentrations (33.33, 25.00, 20.00 and 16.67 % W/V) . The morphology and average sizes of fibers were investigated by scanning elec- tron microscope (SEM). Moreover, dielectric constant of these polymer fibers were evaluated by LCR meter. The results showed that the electrospinning setup can produced smooth, identically andhigh density fibers. According to the optimized condition to fabricated P(VDF-HFP) fibers was 11cmand 20 % concentration. The dielectric constant of obtained fibers is related with average sizes offibers and texture of polymer.
Poster-3 - Board: MNA-23 / 110
The Equipment for Crystal Growth Based on the Hydrolysis Tech- nique
Author: Chalermwong Dokpratoom1 Co-author: Supachai Ritjareonwattu 1
1 Department of Physics, Faculty of Science, Mahasarakham University, Mahasarakham, THAILAND 44150
Corresponding Author: [email protected]
With its unique electrical and optical characteristics, triglycinesulphate(TGS) has been studied ex- tensively. However, the solution of glycine and sulfuric acid has the low evaporation rate, and hence, the long period is required to grow large TGS crystals. The main objective of this research is to inves- tigate the potential of the electric-current stimulation to reduce the growth period of TGS crystals in the supersaturated solution.To grow TGS crystals, the solution was stimulated by the current of
Page 146 Siam Physics Congress 2015 / Book of Abstracts
approximately 0.95 mA. The result shows that electric-current stimulation could reduce the growth period of the TGS to one third of that needed in the thermal crystal growth process. On the other hand, the FTIR spectra show that the stimulation might lead to the proton donation of the carboxylic group from glycines due to of the difference of the pH gradient between the electrodes. Thus, there- duced glycines might influence the formation of the electric domain in TGS crystals. In addition, the electrical and optical properties of the TGS crystal may be controlled by using this approach.
Poster-3 - Board: MNA-30 / 143
Strongly Enhanced Dielectric Response and Dielectric Relaxation in BaTiO3/poly(vinylidene fluoride) Nanocomposites
Author: Kanyapak Silakaew1
Co-authors: Prasit Thongbai 2; Wantana Saijingwong 2
1 Materials science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
In this research work, the BaTiO3/poly(vinylidene fluoride) (BT/PVDF) nanocomposites were pre- pared by a solution processing method using spherical BT nanoparticles (<100 nm) with different volume fractions (fBT = 0−0.4). The microstructure of the nanocomposites was characterized by scanning electron microscope. It was found that the strong agglomeration of BT nanoparticles with large spherical cluster of about 10-30 µm in diameter was formed in the microstructure. Dielectric relaxation behavior in BT/PVDF nanocomposites was investigated at room temperature using a sim- ple parallel capacitor technique. The strong low-frequency dependence of the dielectric permittivity was observed in the BT/PVDF nanocomposites, especially for high-loading BT nanoparticles. This was accompanied with the appearance of the relaxation peak of the loss tangent. The dielectric 3 permittivity and loss tangent values at 10 Hz of the BT/PVDF nanocomposites with fBT = 0.4 were found to be 623.3 and 0.887, respectively. This enhanced dielectric permittivity is significantly larger than that of the PVDF polymer matrix by a factor of about 50. The strongly enhanced dielectric re- sponse was described based on the strong dipole polarization in the large clusters of agglomerated BT nanoparticles and the interfacial polarization at the large interface area of PVDF thin layer between BT clusters.
Poster-3 - Board: MNA-60 / 250
Effect of Sintering Temperature on Behavior of Grain Shapeand Grain Growth of Zn0.97Cu0.01V0.02O Ceramics
Author: Mareenee Buesa1
Co-authors: Nikom choosiri 1; Prachit Kongrattana 1; Prasong Kessaratikoon 1
1 Department of Physics, Faculty of Science, Thaksin University, Songkhla, THAILAND 90000
Corresponding Author: [email protected]
In this study, the Zn0.97Cu0.01V0.02O ceramics were sintered with It was sintered at the temperature of 900◦C, 950◦C, 1000◦C and 1050◦C for 5 hours and prepared by using mixed oxide method. The mi- crostructure evolution of the ceramics were studied and investigated. It was found that the grain size were almost constant in the range of study. Furthermore, the faceted rounded grains with straight metal solid interfaces were observed in this study. Moreover, the grain size increased as the amount of sintering temperature. The change in grain size and microstructures evolution could be explained
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by using the reaction and the diffusion controlled grain growth at low and high temperatures, re- spectively. Moreover, the x-ray structural analysis indicated that the ceramics formation were dual- phase hexagonal and tetragonal crystal structures with angles between them are called the lattice parameters: Alpha=Beta=90,Gamma=120 and Alpha=Beta=Gamma=90, respectively. The SEM re- sult indicated that the particle size increased with the increasing of sintering temperatures.The x-ray structural analysis indicated that the ceramics formation were dual-phase hexagonal and tetragonal crystal structures.This result confirms that the grain shape and grain growth mechanism canbe changed by altering the kinetic factor of temperature.
Poster-3 - Board: MNA-34 / 152
Effect of Annealing Temperature on the Magnetic Properties of Fe Doped SrTiO3 Nanopapicles
Author: Likkhasit Wannasen1
1 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand
Corresponding Author: [email protected]
SrTi0.90Fe0.10O3 nanoparticles were synthesized by hydrothermal method. SrTi0.90Fe0.10O3 sam- ples were annealed at 500, 600 and 700◦C in Ar. X-ray diffraction (XRD) results indicate a perovskite structure of all samples. TEM image shows SrTi0.95Fe0.05O3 nanoparticles of a cubic shape with an average size of 64.7 nm. X-ray absorption spectroscopy (XAS) was used to study the absorption of SrTi0.90Fe0.10O3 with various formal valences. The results show that Fe with oxidation states of Fe2+ and Fe3+ are presented in sample. Magnetic properties were measured using vibrating sample magnetometer (VSM). SrTi0.90Fe0.10O3 exhibits paramagnetic behavior. However, It is found that annealed SrTi0.95Fe0.05O3 in Ar can increase more oxygen vacancies in the structure causing the F-centre exchange (FCE) coupling interaction of metallic ions resulting in ferromagnetic with the maximum magnetization value of 2.24 emu/g for sample annealed at 700 ◦C.
Poster-3 - Board: MNA-24 / 116
Effects of Reagent Concentration and Ultrasound in the Co-precipitation Synthesis of Maghemite Nanoparticles Studied by Synchrotron X- ray Absorption Spectroscopy
Author: Witoon Tangwatanakul1
Co-authors: Chitnarong Sirisathitkul 1; Rattikorn Yimnirun 2; Wanwisa Limphirat 3
1 Molecular Technology Research Unit, School of Science, Walailak University, Nakhon Si Thammarat, THAILAND 80161 2 School of Physics, Institute of Science, Suranaree University of Technology and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials, Nakhon Ratchasima, THAILAND 30000 3 Synchrotron Light Research Institute, Nakhon Ratchasima, THAILAND 30000
Corresponding Author: [email protected]
Synchrotron X-ray absorption spectroscopy (XAS) was used to complement X-ray diffraction (XRD) in the characterization of iron oxide nanoparticles synthesized bythe ultrasonic-assisted co-precipitation. The influence of ultrasound was highlighted byXRD showing impurity phases in the control synthesized without sonication. The hematite (α-Fe2O3) phase was ruled out by XRD and the XAS spectra revealed the preference of the maghemite (γ- Fe2O3) phase over magnetite (Fe3O4). Results from XAS agreed with XRD patterns that γ-Fe2O3
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nanoparticles had larger crystallite sizes and lower structural distortions when higher concentra- tions of Fe(NO3)3•9H2O, FeCl2•4H2O and NaOH and a longer sonication/reaction time were used. Moreover, the synthesis with lowly concentrated reagents gives rise to amorphous γ-Fe2O3.
Poster-3 - Board: MNA-55 / 239
Enhancing the Cycling Stability of SnO2 Hollow Spheres for a Li- ion Battery Anode by Titanium Dioxide Coating
Author: Songyoot Kaewmala1 Co-authors: Nonglak Meethong 1; Pimpa Limthongkul 2
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
SnO2 material has attracted much attention due to its high theoretical capacity (790 mAh/g) com- pared to the current carbon- based anode (372 mAh/g). However, the SnO2 material exhibits a large volume expansion (up to 300 Vol. %) during charging and discharging, which causes crumbling and cracking of the electrode leading to large capacity loss and poor cycling stability. Creating SnO2 with unique nanostructure such as hollow spheres can reduce but not diminish the volume expan- sion. In this study, the effect of TiO2 coating in reducing the volume expansion of the SnO2 hollow spheres is investigated. Effects of different crystal structures ofTiO2 and thickness of TiO2 coat- ing are particularly studied. The results show that the amorphous TiO2 coating with a thickness of about 90 nm has the highest ability to accommodate the volume expansion of SnO2 hollow spheres leading to an improved cycling stability of the electrode.
Poster-3 - Board: MNA-63 / 280
Dielectric Properties of 0-3 Barium Zirconate Titanate˗Portland Cement Composites at 40% BZT Content with Carbon Addition
Author: Ruamporn Potong1 Co-authors: Arnon Chaipanich 2; Rianyoi Rattiyakorn 2
1 Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani, THAILAND 12110 2 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
The 0-3 barium zirconate titanate˗portland cement composites with carbon addition which areex- pected to find application in civil engineering. The barium zirconate titanate, portland cement and carbon powder were fabricated using 425 µm barium zirconate titanate particle size at 40% by vol- ume and varying carbon addition at 0.3-2% by volume. The composites were then cured at 60ºC for 3 days before measurements. The dielectric constant and the dielectric loss at room temperature and various frequencies of the barium zirconate titanate˗portland cement composites with different carbon contents were investigated. The results show that the dielectric constant of composites was found to increase as carbon content increases, and that the dielectric constant was increase to the value of ≈310 for a carbon content of 2%.
Page 149 Siam Physics Congress 2015 / Book of Abstracts
Poster-3 - Board: MNA-06 / 48
Microstructure and Impedance Properties of Sr0.4Ca0.6La4Ti5O17 Ceramics Doped with ZnO
Author: Supunnee Srikeawnawan1
Co-authors: Nikom Chusiri 1; Prasong Kessaratikoon 1; 1
1 Department of Physics, Faculty of Science, Thaksin University Songkhla Campus, Songkhla, THAILAND 90000
Corresponding Author: [email protected]
The microstructure and impedance properties ofSr0.4Ca0.6La4Ti5O17 ceramics were studied and determined. The ceramic was doped with 1, 2 and 3% mol of ZnO and prepared using mixedoxide method. It was sintered at the temperature of 1,400 ◦C for 3 hours. The x-rays diffraction (XRD) tech- nique and scanning electron microscope (SEM) were employed to exam the ceramics microstructure. In addition, the impedance properties of the ceramics were studied and characterized. It was found that the single phase which is SrTiO3 was appeared in 3% mol of doped ZnO ceramic. The ceramic had the cubic crystal structure with the space group Pm-3m and the average of grain size was in the range of 0.9 − 0.99 micrometer. Moreover, the ceramics behaved as a semiconductor with maximum value of real and imaginary parts of impedance equal to 8.23x105 and 6.39x106, respectively.
Poster-3 - Board: MNA-11 / 72
Effects of Oxygen Vacancies on Dielectric Properties ofNa1/2Bi1/2Cu3Ti4O12 Ceramics Prepared by a Urea Combustion Method
Author: Wattana Tuichai1
Co-authors: Prasit Thongbai 2; Santi Maensirid 3; Supamas Danwittayakul 4; Teerapon Yamwong 4
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 2 Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002 3 School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, THAILAND 30000 4 National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, THAILAND 12120
Corresponding Author: [email protected]
The influences of oxygen vacancies on the dielectric and electrical properties ofNa1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method were investigated via annealing in oxidizing atmo- sphere. Interestingly, a single Na1/2Bi1/2Cu3Ti4O12 phase was successfully prepared using a low calcination temperature of 800 ◦C for 6 h. High dielectric permittivity (ε′) and dense ceramic mi- crostructure were achieved by sintering at a low temperature of 980 ◦C. The values of ε′ and tanδ were reduced by annealing in O2 atmosphere, which were described to correlate with the decrease in oxygen vacancies at grain boundaries. A decrease in low-frequency tan δ values can be well explained due to the reduction of DC conduction, which was primarily governed by the enhanced grain boundary resistance due to filling oxygen vacancies. A slight decrease in ε′ due to the anneal- ing process was attributed to the reduction of grain boundary capacitance. By annealing process, the conduction activation energy at the grain boundaries was significantly enhanced, whereas the conduction activation energy inside the grains did not change. The results clearly indicated the ef- fects of oxygen vacancies at the grain boundaries on the giant dielectric response and correlated grain boundary response.
Poster-3 - Board: MNA-10 / 71
Page 150 Siam Physics Congress 2015 / Book of Abstracts
Enhanced Dielectric Response in Na1/3Bi1/3Ca1/3Cu3Ti4O12/PVDF Composites by Filling with Ni Nanoparticles
Author: Pornsawan Kum-onsa1
Co-author: Prasit Thongbai 1
1 Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002
Corresponding Author: [email protected]
In this work, Ni nanoparticle/PVDF-(f=0.2)Na1/3Bi1/3Ca1/3Cu3Ti4O12(Ni/PVDF-NBCCTO) three- phase polymeric nanocomposites with different Ni were fabricated by a liquid-phase assisted disper- sion and hot pressing at 200 ◦C for 0.5 h. The microstructure of the fabricated polymeric nanocom- posites were characterized by a scanning electron microscope. The dielectric properties were inves- tigated as a function of frequency (102-107 Hz) at room temperature. It was found that the dielec- tric permittivity (ε′) of the Ni/PVDF-NBCCTO nanocomposites increased with increasing Ni filling concentration; whereas, the dielectric loss tangent (tan δ) was also enhanced. The ε′ values of the Ni/PVDF-NBCCTO nanocomposites with Ni volume fractions of 0.05, 0.10, 0.15, 0.20, 0.225, 0.25, and 0.275 were found to be 34.8, 40.5, 72.6, 119.6, 233.9, 210.7, and 1120.6, respectively. The enhanced dielectric response in the nanocomposites can be well described by the interfacial polarization and the formation of micro-capacitor in the microstructure.
Poster-3 - Board: MNA-19 / 96
The effect of ZnO on the kinetic parameters of thermolumines- cence window glass exposed to photon irradiation
Author: Thanaporn Thumsa-ard1
Co-author: Jintana Laopaiboon 1
1 85 Sathonlamark Road, Warin Chamrap, Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190,Thailand
Corresponding Author: [email protected]
The present reports the preparation of ZnO doped commercial Thai transparent window glasspro- vided by Gardian Industries Corp. (denoted as WG). The effects of variable concentration ofZnO on thermoluminescence (TL) behavior are studied . The sample were prepared by using the melt quenching technique. The glasses were cut into transparent chips and exposed to X-ray. Trapping parameters are calculated by glow curve shape method for every recorded glow curve. The glow curve structure, order of kinetics and activation energy are related to the concentration of the Zn- doped material. The concentration at 1.000 mol% of ZnO capable of reducing two peak glowcurve of the window glass to a single peak.
Poster-3 - Board: MNA-74 / 355
Improvement of Bar Bonding Method for Heat-Assisted Magnetic Recording Head
Author: Apiwat Phetsahai1
Co-author: Phichet Limsuwan 1
Page 151 Siam Physics Congress 2015 / Book of Abstracts
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok, THAILAND 10140
Corresponding Author: [email protected]
An important step in fabrication of slider magnetic recording head is bonding of bars on a fixture using hot melt synthetic adhesive. For bar bonding of heat-assisted magnetic recording (HAMR) head, the fixture feature is different from a standard fixture yield to excessive bonding agent (EBA) on blade line. Therefore, the aim of this work is to reduce the quantity of EBA on blade line.The effects of fixture heating time (5, 10, 15 and 20 min) at140 ◦C, curing time of bonding agent before bar bonding examined using Newton’s cooling law, and time of bar press (0.5, 1, 2 and 3 min) on the quantity of EBA were determined. The results showed that the quantity of EBA reduced with decreasing fixture heating time or increasing bar press time. Furthermore, it can be concluded thatan appropriate bar bonding method for HAMR head is heating fixture at 140 ◦C for 5 min, painting bond agent on fixture surface and leave for 30 s, placing bar on fixture, and pressing bar for 3min.Using above conditions, the smallest amount of EBA with high adhesion efficiency was achieved.
Poster-3 - Board: MNA-21 / 107
The Effect of Doping Cu2O on Elastic and Structural Properties of Thermoluminescent Glass 90RWG – 10Na2O – xCu2O
Author: Yutthachai Jaichueai1
Co-author: Raewat Laopaiboon 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
The purpose of this work was to study the elastic and structural properties of recycle windowglass thermoluminescent dosimeter using ultrasonic technique and FTIR spectroscopy. The thermolumi- nescent glass system 90RWG – 10Na2O– xCu2O (where x = 0.001, 0.01, 0.1 and 1.0 mol %) were prepared using the melt quenching technique consisting of 5 hr of 1250◦C melting and 2 hr of 500◦C annealing. Densities of glass sample with varied Cu2O dopant were measured. The longitudinal and shear velocities were measured using pulse echo technique at 4 MHz frequency at room tempera- ture. Densities and the ultrasonic velocities of thermoluminescent glass were used for calculation of elastic properties such as longitudinal modulus, shear modulus, bulk modulus, Young’s modulus and Poisson’s ratio. FTIR spectroscopy was measured in wave number range 400−4000 cm−1 to study structure of the glass samples. The result shows that the longitudinal and shear velocities of thermoluminescent glass increase with the increasing Cu2O. The density are not in significant cor- relation with Cu2O concentration in glass system. The change in elastic properties of the thermolu- minescent glass depends on the concentration of Cu2O and can be confirmed by FTIR spectroscopy results.
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 368
Portable pesticide analyzer: a project overview
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 369
ISFET: technical background and commercialization aspect
Page 152 Siam Physics Congress 2015 / Book of Abstracts
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 304
Water-gated OFETs for Pesticide Detection
Author: Kroekchai Inpor1 Co-authors: Chanchana Thanachayanont 1; Nawarin Lukkanakul 2; Nuttakorn Keratipaiboon 1; Pornpimol Sri- tongkham 2; Seeroong Prichanont 3; Sirapat Pratontep 4; Vasin Sattiya 2
1 National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, THAILAND 12120 2 Department of Biomedical Engineering, Faculty of Engineering, Mahidol University 3 Department of Chemical Engineering, Chulalongkorn University, Bangkok, THAILAND 10330 4 College of Nanotechnology, King Mongut’s Institute of Technology Ladkrabang
Corresponding Author: [email protected]
Organic field effect transistors (OFETs) are widely utilized in alternative disposable electronic de- vices. These devices provide fabrication simplicity, low-cost, fast, and adequate sensitivity. Awater- gated OFETs have been reported to operate under low-voltage with low-energy consumption and applied to DNA sensor. In this study, Bottom-contact top-gate water-gated OFETs were fabricated. Drain and source electrode materials were deposited by the thermal evaporation of chromium and gold respectively on glass substrate. Two configurations of electrode were used: standard and interdigitated pattern masks of which channel width and length ratios were varied and thermal evaporated for drain and source electrode. These masks were fabrication in our laboratory bycon- tact printing. Poly(3-hexylthiophene) (P3HT) semiconducting layers were spin-coated using 1, 2 dichlorobenzene as a solvent on drain and source electrode. Deionized water droplets were applied as the dielectric layer for the devices. Gold gate electrode was dipped in deionized water on the top of device. The effects of channel width and length ratio on electrical characteristics of thesemicon- ducting layers were investigated. It was found that the increasing channel width and length ratio improved the electrical performance of the water-gated OFETs. However, at short-channel lengths, the OFETs no longer saturate due to space charge limiting current effect. Changes in transistor characteristics when diluted pesticides were added to the water dielectrics were discussed.
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 167
Imprinted expended gate Field-Effect transistor for pesticide de- tection
Authors: Piyawan Leepheng1; Sirikan Thongboon1 Co-authors: Chanchana Thanachayanont 2; Nongluck Houngkamhang 1; Pornpimol Sritongkham 3; Sirapat Pra- tontep 1; Suppanat Sasipongpana 1; Yossawat Rayanasukha 1
1 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand 2 National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, Thailand 3 Biomedical Engineering, Faculty of Engineering, Mahidol University, 999 Phuttamonthon4 Road, Salaya, Nakhon Pathom 73170, Thailand
Corresponding Authors: [email protected], [email protected]
An extended gate field-effect transistor (EGFET) is a device that can be applied to chemical sensing with the benefit of low cost electrodes. A poly(methylmethacrylate) (PMMA)-imprinted film has been applied to fabricate on indium tin oxide glass as a gate electrode for an EGFET sensor for a specific detection of carbaryl sample. The imprinted film was obtained by mixing PMMAandcar- baryl in dichloromethane and drop-cast on the EGFET electrode. Prior to measurements of carbaryl samples, the film was thoroughly rinsed with a low content of ethanol aqueous solution toremove carbaryl from the film. The carbaryl detection by the imprinted EGFET sensor was compared with
Page 153 Siam Physics Congress 2015 / Book of Abstracts
that of the non-imprinted EGFET. The sensitivity, concentration range and specificity of the sensors were investigated. The imprinted EGFET has a high potential for low cost fabrication of easy-to-use pesticide sensors.
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 310
Acetylcholinesterase/gold nanoparticle/mesocellular foam silica biosensor for pesticide detection in real samples
Author: Nithi Thananukool1
Co-authors: Angkana Phongphut 1; Chanchana Thanachayanont 2; Pornpimol Sritongkham 3; Seeroong Prichanont 1; Sirapat Pratontep 4
1 Department of Chemical Engineering, Chulalongkorn University, Phayathai Road, Wangmai, Patumwan, Bangkok 10330, Thailand 2 National Metal and Materials Technology Center (MTEC) 114 Thailand Science Park (TSP), Phahonyothin Road, KhlongNueng, KhlongLuang, PathumThani 12120, Thailand 3 Department of Biomedical Engineering, Faculty of Engineering, Mahidol University 999 Phutthamonthon 4 Road, Salaya, NakhonPathom 73170, Thailand 4 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand
Corresponding Author: [email protected]
Determination of pesticide residues in food, water, and the environment is crucial for the well-being of human and animals. This is because organophosphates and carbamates, two groups of widely applied pesticides in the agriculture, could inhibit cholinesterase enzyme which then may cause py- rolysis and finally death (Perry et al., 1998) to the livings. The main aim of this work is, therefore, to develop acetylcholinesterase (AChE)-based sensor for detection of pesticides in vegetables, fruits, and waters. Disposable screen-printed carbon and gold electrodes were both investigated as under- lying substrates of modified electrodes. The electrodes were modified by immobilization ofAChE in gold nanoparticle (AuNP)-decorated mesocellular foam silica (MCF), and the chitosan film was then cast over to cover the said nanoparticles. MCF is a type of mesoporous silica with remarkable specific surface area (can be up to 1,500 m2g-1;Ispas et al., 2008), appropriate pore sizes forenzyme immobilization and enhancing enzyme stability (Chouyyok et al., 2009). Moreover, incorporation of AuNPs helps enhancing electrical conductivity of the enzyme carrier. Interestingly, synergic effects between MCF and AuNPs tremendously enhanced current responses. The biosensors were tested for their performances with 4 types of pesticides, namely; chlorpyrifos, methyl parathion, carbaryl and methomyl. Primary tests with samples extracted from pesticide laden cabbage demonstrated that the biosensor could detect 500 ng/mL of methyl parathion. References A. Perry, S.I. Yamamoto, I. Ishaaya, R.Y. Perry, Insecticides in agriculture and environment retrop- spects and prospects. Narosa Publishing House, New Delhi (1998) 61. W. Chouyyok, J. Panpranot, C. Thanachayanont, S. Prichanont, Effects of pH and pore characters of mesoporoussilicas on horseradish peroxidase immobilization, Journal of Molecular Catalysis B: enzymatic 56 (2009) 246-252.
Special Session: Pesticide Biosensor (Sponsored by MTEC) / 201
AChE/agarose gel Coated on ISFET for Methyl-Parathion Sensors
Page 154 Siam Physics Congress 2015 / Book of Abstracts
Author: Supanat Sasipongpana1
Co-authors: Nongluck Houngkamhang 1; Pornpimol Sritongkham 2; Seeroong Prichanont 3; Sirapat Pratontep 4; Yossawat Rayanasukha 1
1 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand 2 4Biomedical Engineering, Faculty of Engineering, Mahidol University, 999 Phuttamonthon 4 Road, Salaya, Nakhon Pathom 73170, Thailand 3 Faculty of Engineering Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand 4 College of Nanotechnology, King Mongkut’s Institute of Technology Ladkrabang, 1 Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand . ThEP Center, CHE, 328 Si Ayutthaya Rd., Bangkok 10400, Thailand
Corresponding Author: [email protected]
A sensor for detecting pesticide by the inhibition of acetylcholine esterase (AChE) enzyme have been fabricated by direct immobilization in an agarose matrix on the surface of ion-sensitive field-effect transistors (ISFET). The enzyme entrapment was achieved by mixing AChE (0.01U) in an agarose gel buffer solution, and droping the mixture onto the surface of ISFET. This AChE-ISFET sensor was used to measure methyl-parathion in a phosphate buffer solution. The study of the agarose gel concentration (0.5%, 1.0%, 1.5% and 2.0%) and the storage time of sensor are reported. The device, which will be further explored in detecting other pesticides, is a promising pesticide sensor with simple preparation and capabilities to be developed as a portable device.
Statistical and Theoretical Physics / 39
Modified kinetic Monte-Carlo algorithm based on fluctuation the- orem
Author: Takol Tangphati1
Co-author: Surachate Limkumnerd 2
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand 2 (1) Department of Physics, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand and (2) Research Center in Thin Film Physics, Thailand Center of Excellence in Physics,CHE, 328 Si Ayutthaya Road, Bangkok 10400, Thailand
Corresponding Author: [email protected]
Kinetic Monte Carlo (KMC) is an algorithm which finds transitions between states during an evo- lution of a system out of equilibrium according to the prescribed transition rate probabilities. One Major caveat with the original KMC is no attention that is given to how the system interacts withthe environment. In particular, it is not known how the transition rate probability matrix plays a role in determining the heat exchange with the environment. To improve upon KMC, a fluctuation theorem is applied to KMC that connects the ratio of transition rate probability and its time conjugate to the entropy change of the environment. Our Modified Kinetic Monte Carlo (MKMC) algorithm chooses the next state in such a way as to obey the second law of thermodynamics. We apply the algorithm to solve the problem of Brownian heat engine operating between two heat baths. The result of the simulation is consistent with the analytic solution and the second law of thermodynamics.
Statistical and Theoretical Physics / 15
The relativistic-like Lagrangian : Multiplicative form
Author: Kittikun Surawuttinack1
Page 155 Siam Physics Congress 2015 / Book of Abstracts
Co-authors: Monsit Tanasittikosol 1; Sikarin Yoo-Kong 1
1 Department of Physics, Faculty of Science, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand 10140
Corresponding Author: [email protected]
An alternative class of the Lagrangian called the multiplicative form is successfully derived. This new Lagrangian can be considered as a one parameter, namely the speed of light, extended class from the standard additive form of the Lagrangian since both yield the same Newtonian equation.
Surface, Interface and Thin Films / 344
Effect of Argon Pressure on the Structural and Optical Properties of RF-Sputtered ZnO Thin Films
Author: Shyama Rath1
Co-authors: Chaman Singh 2; Reena Goyal 3; Sojiphong Chatraphorn 4
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND; Department of Physics and Astrophysics, University of Delhi, Delhi-110007, INDIA 2 Department of Physics and Astrophysics, University of Delhi, Delhi-110007, INDIA 3 Department of Physics and Astrophysics, University of Delhi, Delhi-110007, INDIA 4 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND; Research Centre in Thin Film Physics, Thailand Centre of Excellence in Physics, CHE, Bangkok 10400, THAILAND
Corresponding Author: [email protected]
The wide bandgap semiconducting oxide, ZnO is attractive for a range of optoelectronic devicesdue to its dual advantages of high optical transparency and electrical conductivity. In view of its appli- cations, ZnO films have been grown by a variety of techniques and different methods of material engineering have been used to tailor its properties. In this study, we show the effect of varying oxy- gen partial pressure on the optical properties of rf-sputtered ZnO films. A set of films were obtained for varying argon pressures of 0.025, 0.03, 0.05, 0.075, and 0.1 mbar. The films were subsequently annealed at 400ºC in an oxygen atmosphere. X-ray diffraction and Raman spectra of the films con- firmed the wurtzite structure and a good crystalline quality. The as-deposited films were strained and which relaxed after annealing. Atomic force microscopy was used to monitor the surface topog- raphy and the surface roughness before and after annealing.
The reflectivity spectra of the films showed a decrease in the number of interference fringes withan increase in argon pressure. This is representative of the increase in thickness of the films. Thevalues of the thickness, refractive index, absorption co-efficient and carrier concentration of the films for varying argon pressures are further determined spectroscopic from ellipsometry measurements by analysing the complex dielectric function (ε (E) = ε1(E) + iε2(E)) in the range of 0.5-5.5 eV and using appropriate optical models. The refractive index of the films decreases from 1.859 to 1.794 whenthe argon pressure is increased from 0.015 and 0.1 mbar. The bandgap is investigated by photoluminescence spectroscopy and did not exhibit any significant change with argon pressure. However, the bandgap of the as-deposited film showed a blueshift as compared to the annealed film. A widening of the optical bandgap is due to a high carrier concen- tration induced by non-stoichiometry and explained by the Burstein-Moss shift.
Surface, Interface and Thin Films / 318
Page 156 Siam Physics Congress 2015 / Book of Abstracts
Effect of growth parameters and gamma ray irradiation on lumi- nescence properties of Eu-doped barium titanate thin films
Authors: Satreerat K. Hodak1; Tanapat Ratchatorn1
Co-author: Kittiya Saejia 1
1 Department of Physics, Faculty of Science, Chulalongkorn University, Bangkok, THAILAND 10330
Corresponding Author: [email protected]
Eu-doped BaTiO3 thin films were deposited on quartz and borosilicate glass substrates by asol- gel spin coating process. The films were grown with various growth parameters including film thickness, spinning speed, annealing time, annealing temperature and concentration of europium to evaluate their influence on film luminescent properties. We studied their luminescent properties 5 7 using excitation wavelengths in a UV range. The electric-dipole transition D0 → F2 at about 615 5 7 nm and the magnetic transition D0 → F1 transition at about 589 nm were observed. With an annealing temperature at 600oC for 1 hr, the luminescent intensity of the films deposited on quartz increased with the number of layer deposited. Moreover, the luminescent intensity depended on the spinning speed which was related to the varying film thickness. The luminescent intensity was higher as the thickness increased according to lowering spin speed. The annealing time was varied in the range of 20 min to 80 min and we found that the film annealed for 40 min yielded the best luminescent intensity. Further annealing time and annealing temperature above 600◦C caused the luminescent intensity to decrease. This was due to the fact that the longer annealing time andthe higher temperatures caused a reduction of europium concentration, resulting in a rapid quenching of Eu3+. Also, we found that the luminescence intensity increased as the Eu concentration increased from 3 mol% to 7 mol% and dropped above 7 mol%. Furthermore, the post-synthesis parameter were also analyzed. The films were gamma irradiated with doses of 10, 20, 30 and 40 kGy, andtheir emission spectra were compared with those of non-irradiated films. The emission maxima inthe spectra decreased after gamma exposure doses higher than 20 kGy. The decrease of the emission peak intensities became most apparent in the case of the irradiated film at 30 kGy, the reduction of the emission was 17.2 % for the 615 nm peak wavelength. Gamma ray doses higher than 30 kGy did not cause any further reduction the emission peak intensities.
Surface, Interface and Thin Films / 101
Polysulfone Gas Separation Membrane: Effect of Evaporation Time on Morphology and Mechanical Strength
Author: Thawat Chittrakarn1
Co-authors: Chalad Yuenyao 2; Suksawat Sirijarukul 3; Yutthana Tirawanichakul 3
1 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai, Songkhla 90112, Thailand 2 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai, Songkhla, THAILAND 90112; Thai- land Excellence Center in Physics (ThEP), Bangkok, THAILAND 10400 3 Department of Physics, Faculty of Science, Prince of Songkla University, Hatyai, Songkhla, THAILAND 90112
Corresponding Author: [email protected]
Preparing of polysulfone (PSF) gas separation membranes by dry/wet phase inversion technique were conducted in this work. The effect of evaporation time (ET) on the morphology, structure and gas separation performance of produced PSF membranes was investigated. The ET was varied for 0, 10, 30, 60, and 120 s. Morphology and structure of membrane samples were analyzed through the SEM micrograph and Carnoy version 2.0 software while the gas separation performance was evaluated in term of gas permeation. Mechanical strength in term of modulus was measured by DMTA. Results showed that the defect-free and dense top skin layer asymmetric membranes were produced. The top skin thickness was increased with an increment of ET from 0 to 120 s.However, solvent type was influenced to the skin layer thickness, as well. The CO2 and CH4 permeation rate decreased when ET was increased.
Page 157 Siam Physics Congress 2015 / Book of Abstracts
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Excursion
342
Application of hyperscaling violation in QCD
Author: Jafar Sadeghi1
Co-authors: A. Asadi 2; B. Pourhassan 3
1 Department of Physics, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran 2 Department of Physics, Mazandaran University, Babolsar, Iran 3 Young Researchers Club, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
Corresponding Author: [email protected]
We use a metric with hyperscaling violation and study form factor of QCD. We find the effects of hyperscaling violation on the form factor and obtain the dependence of the form factor on momen- tum numerically. Here by using the hyperscaling violation metric we do not need hard-wall and soft-wall models.
Board: ACC-11 / 133
Study on Transverse Emittance Measurement of Electron Beams from the Thermionic Cathode RF-gun
Author: Kittiya KOSAENTOR1
Co-author: Sakhorn RIMJAEM 1
1 Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200
Corresponding Author: [email protected]
Transverse emittance is one of the important properties of charged particle beams, which indicatesa beam transverse size and its convergent and divergent features. This research focuses on emittance measurements of electron beams that are generated from a 1.6 S-band thermionic cathode RF-gun at the Plasma and Beam Physics Research Facility, Chiang Mai University. Dynamic simulations of electron beams from the RF-gun exit to the experimental station are performed using the computer program PARMELA. Simulation results are used as the support information to develop an emittance measurement setup by utilizing the Quadrupole-scan technique. The experimental setup consists of a quadrupole magnet with a maximum gradient of 7.09 T/m, a fluorescent screen, a CCD cam- era, and an image capture card installed in a PC computer. The emittance values obtained from the measurements and from the simulation results are comparable and will be reported in this contribu- tion. This work has been supported by the CMU Junior Research Fellowship Program, the Science achievement Scholarship of Thailand, and the Department of Physics and Materials Science, Faculty of Science, Chiang Mai University.
Board: CON-14 / 308
Page 158 Siam Physics Congress 2015 / Book of Abstracts
Feasible of an ethanol perform on pristine and p-doped single walled carbon nanotubes
Author: Phongnared Boontueng1 Co-author: Sittipong Komin 1
1 Department of Physics, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, THAILAND 34190
Corresponding Author: [email protected]
We study feasible of ethanol absorbed on pristine and impurity P-doped on armchair single walled carbon nanotubes(SWCNTs) by first principle based on DFT. Van der Waals corrected and spinpo- larized density functional theory calculations using plane wave approach with periodic boundary conditions were carried out to investigate the intermolecular interaction. The interaction between absorbate on the exterior surface and inner site of functionalized SWCNTs is revealed that it prefers to adsorb inner rather than outer of pristine and P-doped SWCNTs. Bader charge analysis and Non- covalent analysis (NCIplot) indicate that the binding energy of ethanol is significantly increased for adsorption on the sidewall of functionalized nanotubes. However, we observe that in inner case, the adsorbate rearranges structure on matching with vdW radius of SWCNTs in comparison to the exterior sidewall of the tubes that ethanol prefer to perform on low curvation. In conclusion, we state that the interaction between an ethanol and both functionalized and pristine SWCNTs is re- markable physisorption. Furthermore, the electronic structure of the considered complex system is not dramastically change in electronic properties.
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