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Discussion of the Surface Science of Quasicrystals Patricia Thiel
Discussion of the Surface Science of Quasicrystals Patricia Thiel To cite this version: Patricia Thiel. Discussion of the Surface Science of Quasicrystals. Philosophical Magazine, Taylor & Francis, 2008, 88 (13-15), pp.2123-2129. 10.1080/14786430802186973. hal-00513904 HAL Id: hal-00513904 https://hal.archives-ouvertes.fr/hal-00513904 Submitted on 1 Sep 2010 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Philosophical Magazine & Philosophical Magazine Letters For Peer Review Only Discussion of the Surface Science of Quasicrystals Journal: Philosophical Magazine & Philosophical Magazine Letters Manuscript ID: TPHM-08-Mar-0086.R1 Journal Selection: Philosophical Magazine Date Submitted by the 30-Apr-2008 Author: Complete List of Authors: Thiel, Patricia; Iowa State University, Department of Chemistry Keywords: quasicrystals, surface physics Keywords (user supplied): quasicrystals, surface physics http://mc.manuscriptcentral.com/pm-pml Page 1 of 15 Philosophical Magazine & Philosophical Magazine Letters 1 2 3 Discussion of the Surface Science of Quasicrystals 4 5 6 7 8 Patricia A. Thiel 9 10 11 Ames Laboratory and Department of Chemistry, Iowa State University 12 13 Ames, IA 50011 USA 14 For Peer Review Only 15 16 17 18 19 20 Abstract. -
The Avs 67Th International Symposium & Exhibition
THE AVS 67TH INTERNATIONAL SYMPOSIUM & EXHIBITION On behalf of the AVS, we invite you to submit an abstract to the AVS 67th International Symposium and Exhibition, which will be held October 24 – 29, 2021 in Charlotte, North Carolina. The AVS Symposium is the premier forum for the presentation and discussion of the science and technology of materials, interfaces, and processing. This year, the Symposium’s theme is “Advances in Interfacial Science for Energy and The Environment.” The challenges facing the development and implementation of new energy sources and solutions to outstanding environmental problems have never been more important. The AVS 67th Annual Symposium will highlight the emergent science and technology of materials and techniques for environmental applications and energy transformation. AVS 67 will be an ideal forum for presentation and discussion of your latest results and will provide many opportunities to connect with other engineers and scientists. A sampling of sessions that encompass this theme include: • Electronic and Photonic Devices for Energy Conversion and Storage • Bioenergy and Biomass Conversion • 2D Materials for Electrochemical, Energy, and Environmental Applications • Structural Characterization of Energy Materials • Analysis of Surfaces and Interfaces Related to Energy and the Environment • Astrochemistry and Surfaces for Space and Extreme Environments • Vacuum Technology for Fusion Research • Hybrid Nanomaterials Based on Biologically-Inspired Approaches • Advances in Heterogeneous Electrocatalysis • Atomic Layer Processing: Integration of Deposition and Etching for Advanced Material Processing • Environmental Interfaces • Catalysis at the Metal Oxide Interface • Pushing the Boundaries of Energy Transfer in Materials • MEMS Technology for Energy and Environment • Energy Efficient Nanoelectronics • Plasma-Engineered Materials and Interfaces for the Environment • Electronic Interfaces and Contacts In addition, we will feature programming on innovative topical areas. -
MRS Materials Connections
RESEARCH/RESEARCHERS ness of the TeSW-prepared p-Si is very thin ing orientation. Some recent studies have such efforts for PZN-PT. In the August and the rms roughness is only 1.6 nm. reported frictional differences, or aniso- issue of the Journal of the American Ceramic The researchers also performed a con- tropy, less than a factor of 3 for incom- Society (p. 2310; DOI: 10.111/j.1551- trolled experiment of p-Si formation using mensurate crystal surfaces when there 2916.2005.00391.x), G. Deng and col- NaOH etchant at various pH levels, but were periodicity differences. leagues from the Shanghai Institute of they observed no efficient PL emission To measure the frictional effects due to Ceramics, China, have reported their suc- from any of the NaOH-prepared samples. periodicity alone and not to other factors cess in synthesizing pure perovskite The researchers pointed out that the such as chemical differences, the re- ceramics of PZN-PZT, as an alternative to reproducibility appeared to be a problem searchers worked with decagonal quasi- PZN-PT, near their MPB. The researchers for the photoetched p-Si synthesis tech- crystals of an aluminum-nickel-cobalt (Al- have observed much higher piezoelectric nique. They point out that others have Ni-Co) alloy. Stacked planes of Al-Ni-Co and electromechanical coupling coeffi- suggested that the preexisting state of the crystals exhibit both tenfold and twofold cients for their newly synthesized mate- Si surface plays a decisive role in deter- rotational symmetry. By cutting a single rial than those reported earlier. -
Minutes for the Basic Energy Sciences Advisory Committee Meeting July 29-30, 1998, Gaithersburg Hilton Hotel, Gaithersburg, Maryland
Minutes for the Basic Energy Sciences Advisory Committee Meeting July 29-30, 1998, Gaithersburg Hilton Hotel, Gaithersburg, Maryland BESAC members present: Boris Batterman Thomas Russell Jack Crow Zhi-Xun Shen Marye Anne Fox (Vice Chair) Sunil Sinha Jan Herbst Richard Smalley Linda Horton David Tirrell Franklin Orr Patricia Thiel Geraldine Richmond (Chair) BESAC members absent: Barbara Garrison Carolyn Meyers Robert Horsch Edel Wasserman Stephen Leone Conrad Williams Marsha Lester Also present: Jim Decker, Deputy Director, ER (Wednesday only) Patricia Dehmer, Associate Director, ER, OBES Martha Krebs, Director, ER (Wednesday afternoon only) Iran Thomas, Deputy Associate Director, ER, OBES and Director, Division of Materials Sciences, OBES July 29, 1998 Chair Geraldine Richmond opened the meeting at 8:30 a.m. She had each committee member introduce himself or herself. She then introduced Patricia Dehmer to provide an overview of the Department of Energy (DOE) and of the Office of Basic Energy Sciences (BES). In her preliminary remarks, Dehmer welcomed the members to the meeting and stressed the importance of this advisory committee, BESAC, pointing out that it produced outcomes as well as outputs. One outcome has been the Birgeneau Report that reviewed the major light-source initiatives; it will be the force in determining funding for those sources, and it has already become part of the vernacular on Capitol Hill. An output has been the analysis of the shutdown of the High-Flux Beam Reactor (HFBR). She pointed out that BESAC already has three charges for this year: to review the High Flux Isotope Reactor (HFIR), to conduct a workshop on fourth-generation light sources, and to conduct a workshop on complex systems. -
Tiling the Plane with Equilateral Convex Pentagons Maria Fischer1
Parabola Volume 52, Issue 3 (2016) Tiling the plane with equilateral convex pentagons Maria Fischer1 Mathematicians and non-mathematicians have been concerned with finding pentago- nal tilings for almost 100 years, yet tiling the plane with convex pentagons remains the only unsolved problem when it comes to monohedral polygonal tiling of the plane. One of the oldest and most well known pentagonal tilings is the Cairo tiling shown below. It can be found in the streets of Cairo, hence the name, and in many Islamic decorations. Figure 1: Cairo tiling There have been 15 types of such pentagons found so far, but it is not clear whether this is the complete list. We will look at the properties of these 15 types and then find a complete list of equilateral convex pentagons which tile the plane – a problem which has been solved by Hirschhorn in 1983. 1Maria Fischer completed her Master of Mathematics at UNSW Australia in 2016. 1 Archimedean/Semi-regular tessellation An Archimedean or semi-regular tessellation is a regular tessellation of the plane by two or more convex regular polygons such that the same polygons in the same order surround each polygon. All of these polygons have the same side length. There are eight such tessellations in the plane: # 1 # 2 # 3 # 4 # 5 # 6 # 7 # 8 Number 5 and number 7 involve triangles and squares, number 1 and number 8 in- volve triangles and hexagons, number 2 involves squares and octagons, number 3 tri- angles and dodecagons, number 4 involves triangles, squares and hexagons and num- ber 6 squares, hexagons and dodecagons. -
Congratulations to the New 25 Year Club Members of 2010
CONGRATULATIONS TO THE NEW 25 YEAR CLUB MEMBERS OF 2010 TWENTY-FIVE YEAR HONOREES The following persons completed 25 years of employment at ISU during the calendar year of 2008. New members being welcomed to this honored organization are: DIVISION OF THE PRESIDENT Cindy Van Loon Human Resource Services DIVISION OF ACADEMIC AFFAIRS COLLEGE OF AGRICULTURE & LIFE SCIENCES Dennis Garvey Animal Science Catherine Good Ag Exp Stn Administration Martha Jeffrey Animal Science Danny Johnson Animal Science Randy Killorn Agronomy Susan Lamont Animal Science Robert Martin Ag Education Sally Medford IA State Research Farms Pamela Mundt Agronomy Donna Nelson Animal Science Jonathan Sandor Agronomy Ann Shuey Animal Science Jeffrey Thorson Animal Science Helene Uhlenhopp Agronomy COLLEGE OF BUSINESS Ronald Ackerman Business Graduate Program Farhad Choobineh Log Operation & Mis Mark Power Finance Jenison Stoehr Log Operations and MIS COLLEGE OF DESIGN Clare Cardinal-Pett Architecture COLLEGE OF ENGINEERING Robert Abendroth Civ/Con/ Env Engineering Linda Edson Chemical & Bio Engineering Jeffrey Eichorn Ind/ Manufacturing Systems Engineering Scott Schlorholtz Materials Science and Engineering Martha Selby Materials Science and Engineering Terry Wipf Civ/Con/Env Eng COLLEGE OF HUMAN SCIENCES Marcia Rosenbusch Curriculum/ Instruction COLLEGE OF LIBERAL ARTS & SCIENCES Barbara Blakely English Michael Duffy Economics Sally Gleason Chemistry Kristy Goodale Mathematics Margaret Graham English J Arne Hallam Economics Paul Hollander Chemistry Margaret Holmgren Philosophy/ -
Detc2020-17855
Proceedings of the ASME 2020 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2020 August 16-19, 2020, St. Louis, USA DETC2020-17855 DRAFT: GENERATIVE INFILLS FOR ADDITIVE MANUFACTURING USING SPACE-FILLING POLYGONAL TILES Matthew Ebert∗ Sai Ganesh Subramanian† J. Mike Walker ’66 Department of J. Mike Walker ’66 Department of Mechanical Engineering Mechanical Engineering Texas A&M University Texas A&M University College Station, Texas 77843, USA College Station, Texas 77843, USA Ergun Akleman‡ Vinayak R. Krishnamurthy Department of Visualization J. Mike Walker ’66 Department of Texas A&M University Mechanical Engineering College Station, Texas 77843, USA Texas A&M University College Station, Texas 77843, USA ABSTRACT 1 Introduction We study a new class of infill patterns, that we call wallpaper- In this paper, we present a geometric modeling methodology infills for additive manufacturing based on space-filling shapes. for generating a new class of infills for additive manufacturing. To this end, we present a simple yet powerful geometric modeling Our methodology combines two fundamental ideas, namely, wall- framework that combines the idea of Voronoi decomposition space paper symmetries in the plane and Voronoi decomposition to with wallpaper symmetries defined in 2-space. We first provide allow for enumerating material patterns that can be used as infills. a geometric algorithm to generate wallpaper-infills and design four special cases based on selective spatial arrangement of seed points on the plane. Second, we provide a relationship between 1.1 Motivation & Objectives the infill percentage to the spatial resolution of the seed points for Generation of infills is an essential component in the additive our cases thus allowing for a systematic way to generate infills manufacturing pipeline [1, 2] and significantly affects the cost, at the desired volumetric infill percentages. -
Polyhedra “There Is Geometry in the Humming of Strings, There Is Music in the Spacing of the Spheres.” - Pythagoras
Polyhedra “There is geometry in the humming of strings, there is music in the spacing of the spheres.” - Pythagoras Math 110 Math Applications Art, Fall 2018 A Quick Review of Polygons Edge • A closed, connected chain of (straight) line segments. Face The line segments are called edges or sides • Vertex • The points where two segments meet are called vertices, nodes, or corners Interior Angle • The area surrounded by the segments is called the face • The path created by the sides is called the Below are NOT polygons: boundary or perimeter • An interior angle is measured within the face, and is formed by two sides Sides not straight Not connected Not closed Math 110 Math Applications Art, Fall 2018 Classifying Polygons • Polygons are named for the number of sides they have: triangle/trigon (3), quadrilateral (4), pentagon (5), hexagon (6), etc. • An n-gon is a polygon with n sides • If all edges have the same length, the polygon is called equilateral • If all angles have the same measure, the polygon is called equiangular • If the polygon is BOTH equilateral and equiangular, it is called regular • NOTE: Regular is sometimes used to imply only equilateral. In these slides, assume regular means both “equal side length” and “equal angles” Math 110 Math Applications Art, Fall 2018 Classifying Polygons • A polygon is convex if it is NOT possible to draw a line segment that begins and ends within the polygon, but leaves the polygon at some point in between Convex: Not convex: Any line segment we draw will We can find at least one line segment -
Properties of Convex Pentagonal Tiles for Periodic Tiling
1 Properties of Convex Pentagonal Tiles for Periodic Tiling Teruhisa SUGIMOTO The Interdisciplinary Institute of Science, Technology and Art, Suzukidaini-building 211, 2-5-28 Kitahara, Asaka-shi, Saitama, 351-0036, Japan E-mail address: [email protected] Abstract A convex pentagonal tile is a convex pentagon that admits a monohedral tiling. We show that a convex pentagonal tile that admits a periodic tiling has a property in which the sum of three internal angles of the pentagon is equal to 360◦. Keywords: convex pentagon, tile, periodic tiling, monohedral tiling 1 Introduction A tiling or tessellation of the plane is a collection of sets that are called tiles, which covers a plane without gaps and overlaps, except for the boundaries of the tiles. If all the tiles in a tiling are of the same size and shape, then the tiling is monohedral. Then, a polygon that admits a monohedral tiling is called a prototile of monohedral tiling, or simply, a polygonal tile. A tiling by convex polygons is edge-to-edge if any two convex polygons in a tiling are either disjoint or share one vertex or an entire edge in common [4,5,14,16{20]. A tiling of the plane is periodic if the tiling can be translated onto itself in two nonparallel directions [4,5,19]. In the classification problem of convex polygonal tiles, only the pentagonal case is open. At present, fifteen families of convex pentagonal tiles, each of them referred to as a \Type" (i.e., Type 1, Type 2, etc. up to Type 15), are known (see Figure 1) but it is not known whether this list is complete1 [2{14,17,20,22,23]. -
Tiling with Penalties and Isoperimetry with Density
Rose-Hulman Undergraduate Mathematics Journal Volume 13 Issue 1 Article 6 Tiling with Penalties and Isoperimetry with Density Yifei Li Berea College, [email protected] Michael Mara Williams College, [email protected] Isamar Rosa Plata University of Puerto Rico, [email protected] Elena Wikner Williams College, [email protected] Follow this and additional works at: https://scholar.rose-hulman.edu/rhumj Recommended Citation Li, Yifei; Mara, Michael; Plata, Isamar Rosa; and Wikner, Elena (2012) "Tiling with Penalties and Isoperimetry with Density," Rose-Hulman Undergraduate Mathematics Journal: Vol. 13 : Iss. 1 , Article 6. Available at: https://scholar.rose-hulman.edu/rhumj/vol13/iss1/6 Rose- Hulman Undergraduate Mathematics Journal Tiling with Penalties and Isoperimetry with Density Yifei Lia Michael Marab Isamar Rosa Platac Elena Wiknerd Volume 13, No. 1, Spring 2012 aDepartment of Mathematics and Computer Science, Berea College, Berea, KY 40404 [email protected] bDepartment of Mathematics and Statistics, Williams College, Williamstown, MA 01267 [email protected] cDepartment of Mathematical Sciences, University of Puerto Rico at Sponsored by Mayagez, Mayagez, PR 00680 [email protected] dDepartment of Mathematics and Statistics, Williams College, Rose-Hulman Institute of Technology Williamstown, MA 01267 [email protected] Department of Mathematics Terre Haute, IN 47803 Email: [email protected] http://www.rose-hulman.edu/mathjournal Rose-Hulman Undergraduate Mathematics Journal Volume 13, No. 1, Spring 2012 Tiling with Penalties and Isoperimetry with Density Yifei Li Michael Mara Isamar Rosa Plata Elena Wikner Abstract. We prove optimality of tilings of the flat torus by regular hexagons, squares, and equilateral triangles when minimizing weighted combinations of perime- ter and number of vertices. -
Novel Biological, Forensic, and Historical Applications of Inductively Coupled Plasma-Mass Spectrometry Megan Louise Mekoli Iowa State University
Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2012 Novel biological, forensic, and historical applications of inductively coupled plasma-mass spectrometry Megan Louise Mekoli Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Analytical Chemistry Commons Recommended Citation Mekoli, Megan Louise, "Novel biological, forensic, and historical applications of inductively coupled plasma-mass spectrometry" (2012). Graduate Theses and Dissertations. 12832. https://lib.dr.iastate.edu/etd/12832 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Novel biological, forensic, and historical applications of inductively coupled plasma-mass spectrometry by Megan Louise Mekoli A dissertation submitted to the graduate faculty in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Major: Analytical Chemistry Program of Study Committee: R. Sam Houk, Major Professor Ning Fang Young-Jin Lee Patricia Thiel L. Keith Woo Iowa State University Ames, Iowa 2012 Copyright © Megan Louise Mekoli, 2012. All rights reserved. ii Table of Contents Abstract iv Chapter 1. Introduction 1 ICP-MS 1 Intro and General Advantages 1 Inductively Coupled Plasma 1 Mass Spectrometer 2 Polyatomic Interferences 4 Memory Effects 5 Sample Preparation 6 Dissolution 6 Clean Techniques 7 Laser ablation 7 Carrier Gas 8 Pulse Length 8 Dissertation Organization 9 Figures 10 References 11 Chapter 2. -
2.1. Bilateral Symmetry
Symmetry through the Eyes of a Chemist Magdolna Hargittai · Istvan´ Hargittai Symmetry through the Eyes of a Chemist Third Edition 123 Magdolna Hargittai Istvan´ Hargittai Budapest University of Technology and Economics P. O. Box 91 H-1521 Budapest Hungary [email protected] [email protected] ISBN: 978-1-4020-5627-7 e-ISBN: 978-1-4020-5628-4 DOI 10.1007/978-1-4020-5628-4 Library of Congress Control Number: 2008926635 c Springer Science+Business Media B.V. 2009 No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording or otherwise, without written permission from the Publisher, with the exception of any material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Printed on acid-free paper 987654321 springer.com Preface It is gratifying to launch the third edition of our book. Its coming to life testifies about the task it has fulfilled in the service of the commu- nity of chemical research and learning. As we noted in the Prefaces to the first and second editions, our book surveys chemistry from the point of view of symmetry. We present many examples from chem- istry as well as from other fields to emphasize the unifying nature of the symmetry concept. Our aim has been to provide aesthetic plea- sure in addition to learning experience. In our first Preface we paid tribute to two books in particular from which we learned a great deal; they have influenced significantly our approach to the subject matter of our book.