DOCSLIB.ORG

Possible Effects of Electromagnetic Fields (EMF) on Human Health

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Possible Effects of Electromagnetic Fields (EMF) on Human Health Scientific Committee on Emerging and Newly Identified Health Risks SCENIHR Possible effects of Electromagnetic Fields (EMF) on Human Health The SCENIHR adopted this opinion at the 16th plenary of 21 March 2007 after public consultation Possible effects of Electromagnetic Fields (EMF) on Human Health About the Scientific Committees Three independent non-food Scientific Committees provide the Commission with the scientific advice it needs when preparing policy and proposals relating to consumer safety, public health and the environment. The Committees also draw the Commission's attention to the new or emerging problems which may pose an actual or potential threat. They are: the Scientific Committee on Consumer Products (SCCP), the Scientific Committee on Health and Environmental Risks (SCHER) and the Scientific Committee on Emerging and Newly Identified Health Risks (SCENIHR) and are made up of external experts. In addition, the Commission relies upon the work of the European Food Safety Authority (EFSA), the European Medicines Evaluation Agency (EMEA), the European Centre for Disease prevention and Control (ECDC) and the European Chemicals Agency (ECHA). SCENIHR Questions concerning emerging or newly-identified risks and on broad, complex or multi- disciplinary issues requiring a comprehensive assessment of risks to consumer safety or public health and related issues not covered by other Community risk- assessment bodies. In particular, the Committee addresses questions related to potential risks associated with interaction of risk factors, synergic effects, cumulative effects, antimicrobial resistance, new technologies such as nanotechnologies, medical devices, tissue engineering, blood products, fertility reduction, cancer of endocrine organs, physical hazards such as noise and electromagnetic fields and methodologies for assessing new risks. Scientific Committee members Anders Ahlbom, James Bridges, Wim De Jong, Jana Hajslová, Philippe Hartemann, Thomas Jung, Mats-Olof Mattsson, Jean-Marie Pagès, Konrad Rydzynski, Dorothea Stahl, Mogens Thomsen, David Williams Contact: European Commission Health & Consumer Protection DG Directorate C: Public Health and Risk Assessment Unit C7 - Risk Assessment Office: B232 B-1049 Brussels [email protected] © European Commission 2007 The opinions of the Scientific Committees present the views of the independent scientists who are members of the committees. They do not necessarily reflect the views of the European Commission. The opinions are published by the European Commission in their original language only. http://ec.europa.eu/health/ph_risk/risk_en.htm 2 Possible effects of Electromagnetic Fields (EMF) on Human Health ACKNOWLEDGMENTS Members of the working group are acknowledged for their valuable contribution to this opinion. The members of the working group are: SCENIHR members: Prof. Anders Ahlbom (Chair and Rapporteur) Prof. James Bridges Prof. Mats-Olof Mattsson External experts: Dr. René de Seze, INERIS (National Institute for Environment and Industrial Risk), France Lena Hillert, MD, PhD, Department of Public Health Sciences, Division of Occupational Medicine, Karolinska Institute and Department of Occupational and Environmental Health, Stockholm Centre for Public Health, Sweden Prof. Jukka Juutilainen, Department of Environmental Sciences, University of Kuopio, Finland Dr. Georg Neubauer1, Business Unit Mobile Communications Safety, Austrian Research Centers GmbH - ARC, Austria Dr. Joachim Schüz, Institute of Cancer Epidemiology, The Danish Cancer Society, Denmark PD Dr. Myrtill Simko, Institut für Zellbiologie und Biosystemtechnik, Universität Rostock, Germany 1 Declared Interest (see minutes of the SCENIHR plenary meeting of 28-29 September 2005: http://ec.europa.eu/health/ph_risk/committees/04_scenihr/docs/scenihr_mi_007.pdf). 3 Possible effects of Electromagnetic Fields (EMF) on Human Health ABSTRACT The Scientific Committee on Emerging and Newly Identified Health Risks (SCENIHR) has updated the previous opinion on ”Possible effects of Electromagnetic Fields (EMF), Radio Frequency Fields (RF) and Microwave Radiation on human health” by the Scientific Committee on Toxicity, Ecotoxicity and the Environment (CSTEE) from 2001, with respect to whether or not exposure to electromagnetic fields (EMF) is a cause of disease or other health effects. The opinion is primarily based on scientific articles, published in English language peer-reviewed scientific journals. Only studies that are considered relevant for the task are cited and commented upon in the opinion. The opinion is divided into frequency (f) bands, namely: radio frequency (RF) (100 kHz < f ≤ 300 GHz), intermediate frequency (IF) (300 Hz < f ≤ 100 kHz), extremely low frequency (ELF) (0< f ≤ 300 Hz), and static (0 Hz) (only static magnetic fields are considered in this opinion). There is a separate section for environmental effects. Radio Frequency Fields (RF fields) Since the adoption of the 2001 opinion extensive research has been conducted regarding possible health effects of exposure to low intensity RF fields, including epidemiologic, in vivo, and in vitro research. In conclusion, no health effect has been consistently demonstrated at exposure levels below the limits of ICNIRP (International Committee on Non Ionising Radiation Protection) established in 1998. However, the data base for evaluation remains limited especially for long-term low-level exposure. Intermediate Frequency Fields (IF fields) Experimental and epidemiological data from the IF range are very sparse. Therefore, assessment of acute health risks in the IF range is currently based on known hazards at lower frequencies and higher frequencies. Proper evaluation and assessment of possible health effects from long-term exposure to IF fields are important because human exposure to such fields is increasing due to new and emerging technologies. Extremely low frequency fields (ELF fields) The previous conclusion that ELF magnetic fields are possibly carcinogenic, chiefly based on occurrence of childhood leukaemia, is still valid. For breast cancer and cardiovascular disease, recent research has indicated that an association is unlikely. For neurodegenerative diseases and brain tumours, the link to ELF fields remains uncertain. No consistent relationship between ELF fields and self-reported symptoms (sometimes referred to as electrical hypersensitivity) has been demonstrated. Static Fields Adequate data for proper risk assessment of static magnetic fields are very sparse. Developments of technologies involving static magnetic fields, e.g. with MRI (Magnetic Resonance Imaging) equipment require risk assessments to be made in relation to occupational exposure. Environmental Effects There are insufficient data to identify whether a single exposure standard is appropriate to protect all environmental species from EMF. Similarly the data are inadequate to judge whether the environmental standards should be the same or significantly different from those appropriate to protect human health. Keywords: EMF, electromagnetic fields, radiofrequency fields, intermediate frequency fields, extremely low frequency fields, static fields, health effects, human health, environmental effects, SCENIHR, Scientific Committee on Emerging and Newly Identified Health Risks Opinion to be cited as: SCENIHR (Scientific Committee on Emerging and Newly Identified Health Risks). Possible effects of Electromagnetic Fields (EMF) on Human Health. 21 March 2007 4 Possible effects of Electromagnetic Fields (EMF) on Human Health TABLE OF CONTENTS ACKNOWLEDGMENTS ........................................................................................... 3 ABSTRACT .......................................................................................................... 4 EXECUTIVE SUMMARY........................................................................................... 6 1. BACKGROUND ........................................................................................... 8 2. TERMS OF REFERENCE .............................................................................. 10 3. SCIENTIFIC RATIONALE ............................................................................ 11 3.1. Introduction ......................................................................................... 11 3.2. Methods............................................................................................... 12 3.3. Radio Frequency Fields (RF fields) ........................................................... 13 3.3.1. Sources and distribution of exposure in the population......................... 13 3.3.2. Cancer .......................................................................................... 15 3.3.2.1. Epidemiology........................................................................... 15 3.3.2.2. In vivo ................................................................................... 20 3.3.2.3. In vitro................................................................................... 21 3.3.3. Symptoms..................................................................................... 23 3.3.4. Nervous system effects ................................................................... 25 3.3.5. Miscellaneous human ...................................................................... 27 3.3.6. Reproduction and development......................................................... 27 3.3.7. Sensitivity of children.....................................................................
Load more

Recommended publications
  • (EMF) and Electric Field (EF) on Some Behavior of Honeybees
    bioRxiv preprint doi: https://doi.org/10.1101/608182; this version posted April 13, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Effect of Electromagnetic Field (EMF) and Electric Field (EF) on Some Behavior of 2 Honeybees (Apis mellifera L.) 3 Effect Of Electromagnetic Field On Honeybees 4 Yaşar ERDOĞAN1* and Mahir Murat CENGİZ2 5 *1- Bayburt University, Demirözü Vocational High School, Veterinary Department, Bayburt, 6 Turkey. [email protected]. 7 2-Atatürk University, Erzurum Vocational High School Department of Horse Training. 8 Erzurum, Turkey 9 KEY WORDS: Apiculture, Detect food, Magnetoreception, Helmholtz coil equipment 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 1 bioRxiv preprint doi: https://doi.org/10.1101/608182; this version posted April 13, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 28 Summary 29 Honeybees uses the magnetic field of the earth to to determine their direction. 30 Nowadays, the rapid spread of electrical devices and mobile towers leads to an increase in 31 man-made EMF. This causes honeybees to lose their orientation and thus lose their hives. 32 ABSTRACT 33 Geomagnetic field can be used by different magnetoreception mechanisms, for 34 navigation and orientation by honeybees.
    [Show full text]
  • Electromagnetism As Quantum Physics
    Electromagnetism as Quantum Physics Charles T. Sebens California Institute of Technology May 29, 2019 arXiv v.3 The published version of this paper appears in Foundations of Physics, 49(4) (2019), 365-389. https://doi.org/10.1007/s10701-019-00253-3 Abstract One can interpret the Dirac equation either as giving the dynamics for a classical field or a quantum wave function. Here I examine whether Maxwell's equations, which are standardly interpreted as giving the dynamics for the classical electromagnetic field, can alternatively be interpreted as giving the dynamics for the photon's quantum wave function. I explain why this quantum interpretation would only be viable if the electromagnetic field were sufficiently weak, then motivate a particular approach to introducing a wave function for the photon (following Good, 1957). This wave function ultimately turns out to be unsatisfactory because the probabilities derived from it do not always transform properly under Lorentz transformations. The fact that such a quantum interpretation of Maxwell's equations is unsatisfactory suggests that the electromagnetic field is more fundamental than the photon. Contents 1 Introduction2 arXiv:1902.01930v3 [quant-ph] 29 May 2019 2 The Weber Vector5 3 The Electromagnetic Field of a Single Photon7 4 The Photon Wave Function 11 5 Lorentz Transformations 14 6 Conclusion 22 1 1 Introduction Electromagnetism was a theory ahead of its time. It held within it the seeds of special relativity. Einstein discovered the special theory of relativity by studying the laws of electromagnetism, laws which were already relativistic.1 There are hints that electromagnetism may also have held within it the seeds of quantum mechanics, though quantum mechanics was not discovered by cultivating those seeds.
    [Show full text]
  • Review on Biophysical Modelling and Simulation Studies for Transcranial Magnetic Stimulation
    Review on Biophysical Modelling and Simulation Studies for Transcranial Magnetic Stimulation Jose Gomez-Tames1, Ilkka Laakso2, and Akimasa Hirata1 1. Nagoya Institute of Technology, Department of Electrical and Mechanical Engineering, Nagoya, Aichi 466-8555, Japan 2. Department of Electrical Engineering and Automation, Aalto University, FI-00076, Finland. Corresponding author: Jose Gomez-Tames Nagoya Institute of Technology Tel & Fax: +81-52-735-7916 E-mail:[email protected] 1 Abstract Transcranial magnetic stimulation (TMS) is a technique for noninvasively stimulating a brain area for therapeutic, rehabilitation treatments and neuroscience research. Despite our understanding of the physical principles and experimental developments pertaining to TMS, it is difficult to identify the exact brain target as the generated dosage exhibits a non-uniform distribution owing to the complicated and subject-dependent brain anatomy and the lack of biomarkers that can quantify the effects of TMS in most cortical areas. Computational dosimetry has progressed significantly and enables TMS assessment by computation of the induced electric field (the primary physical agent known to activate the brain neurons) in a digital representation of the human head. In this review, TMS dosimetry studies are summarised, clarifying the importance of the anatomical and human biophysical parameters and computational methods. This review shows that there is a high consensus on the importance of a detailed cortical folding representation and an accurate modelling of the surrounding cerebrospinal fluid. Recent studies have also enabled the prediction of individually optimised stimulation based on magnetic resonance imaging of the patient/subject and have attempted to understand the temporal effects of TMS at the cellular level by incorporating neural modelling.
    [Show full text]
  • Electromagnetic Field Theory
    Lecture 4 Electromagnetic Field Theory “Our thoughts and feelings have Dr. G. V. Nagesh Kumar Professor and Head, Department of EEE, electromagnetic reality. JNTUA College of Engineering Pulivendula Manifest wisely.” Topics 1. Biot Savart’s Law 2. Ampere’s Law 3. Curl 2 Releation between Electric Field and Magnetic Field On 21 April 1820, Ørsted published his discovery that a compass needle was deflected from magnetic north by a nearby electric current, confirming a direct relationship between electricity and magnetism. 3 Magnetic Field 4 Magnetic Field 5 Direction of Magnetic Field 6 Direction of Magnetic Field 7 Properties of Magnetic Field 8 Magnetic Field Intensity • The quantitative measure of strongness or weakness of the magnetic field is given by magnetic field intensity or magnetic field strength. • It is denoted as H. It is a vector quantity • The magnetic field intensity at any point in the magnetic field is defined as the force experienced by a unit north pole of one Weber strength, when placed at that point. • The magnetic field intensity is measured in • Newtons/Weber (N/Wb) or • Amperes per metre (A/m) or • Ampere-turns / metre (AT/m). 9 Magnetic Field Density 10 Releation between B and H 11 Permeability 12 Biot Savart’s Law 13 Biot Savart’s Law 14 Biot Savart’s Law : Distributed Sources 15 Problem 16 Problem 17 H due to Infinitely Long Conductor 18 H due to Finite Long Conductor 19 H due to Finite Long Conductor 20 H at Centre of Circular Cylinder 21 H at Centre of Circular Cylinder 22 H on the axis of a Circular Loop
    [Show full text]
  • Electro Magnetic Fields Lecture Notes B.Tech
    ELECTRO MAGNETIC FIELDS LECTURE NOTES B.TECH (II YEAR – I SEM) (2019-20) Prepared by: M.KUMARA SWAMY., Asst.Prof Department of Electrical & Electronics Engineering MALLA REDDY COLLEGE OF ENGINEERING & TECHNOLOGY (Autonomous Institution – UGC, Govt. of India) Recognized under 2(f) and 12 (B) of UGC ACT 1956 (Affiliated to JNTUH, Hyderabad, Approved by AICTE - Accredited by NBA & NAAC – ‘A’ Grade - ISO 9001:2015 Certified) Maisammaguda, Dhulapally (Post Via. Kompally), Secunderabad – 500100, Telangana State, India ELECTRO MAGNETIC FIELDS Objectives: • To introduce the concepts of electric field, magnetic field. • Applications of electric and magnetic fields in the development of the theory for power transmission lines and electrical machines. UNIT – I Electrostatics: Electrostatic Fields – Coulomb’s Law – Electric Field Intensity (EFI) – EFI due to a line and a surface charge – Work done in moving a point charge in an electrostatic field – Electric Potential – Properties of potential function – Potential gradient – Gauss’s law – Application of Gauss’s Law – Maxwell’s first law, div ( D )=ρv – Laplace’s and Poison’s equations . Electric dipole – Dipole moment – potential and EFI due to an electric dipole. UNIT – II Dielectrics & Capacitance: Behavior of conductors in an electric field – Conductors and Insulators – Electric field inside a dielectric material – polarization – Dielectric – Conductor and Dielectric – Dielectric boundary conditions – Capacitance – Capacitance of parallel plates – spherical co‐axial capacitors. Current density – conduction and Convection current densities – Ohm’s law in point form – Equation of continuity UNIT – III Magneto Statics: Static magnetic fields – Biot‐Savart’s law – Magnetic field intensity (MFI) – MFI due to a straight current carrying filament – MFI due to circular, square and solenoid current Carrying wire – Relation between magnetic flux and magnetic flux density – Maxwell’s second Equation, div(B)=0, Ampere’s Law & Applications: Ampere’s circuital law and its applications viz.
    [Show full text]
  • A Review of the Safety of Transcranial Magnetic Stimulation
    Pioneers in nerve stimulation and monitoring A REVIEW OF THE SAFETY OF TRANSCRANIAL MAGNETIC STIMULATION by Anwen Evans BSc, MSc © The Magstim Company Limited © The Magstim Company Limited The Safety of Transcranial Magnetic Stimulation Acknowledgement and Overview of Report Acknowledgement The author wishes to thank Professor Anthony T Barker, of the Royal Hallamshire Hospital, Sheffield, for all help received during the writing of this review © The Magstim Company Limited - 3 - 19 April 2007 The Safety of Transcranial Magnetic Stimulation Acknowledgement and Overview of Report © The Magstim Company Limited - 4 - 19 April 2007 The Safety of Transcranial Magnetic Stimulation Acknowledgement and Overview of Report Overview of Report The benefits of transcranial magnetic stimulation were first demonstrated in 1985. Recent developments mean that the technique is now moving out of the research laboratory and into the clinical setting. This report provides an overview of the evidence for the safety of transcranial magnetic stimulation as a medical technique. A literature search was undertaken using Pubmed and Google Scholar as the search engines. Parameters included the use of ‘transcranial magnetic stimulation’ with or without ‘safety’. The resultant report sets out some of the most common side effects of transcranial magnetic stimulation and evaluates their incidence and their comparative seriousness. The literature up to late 2006 suggests that unintentional seizure induction using single pulse TMS is a rare event. The intensity of stimulation required to reliably induce seizure is many times that used routinely in TMS and rTMS. Furthermore, the commonest side effect of TMS is headache. Research has also shown that single-pulse TMS is safe to administer in children and adolescents.
    [Show full text]
  • Journal of Electromagnetic Analysis and Applications Special Issue on Bioelectromagnetics
    Journal of Electromagnetic Scientific Research Open Access Analysis and Applications ISSN Online: 1942-0749 Special Issue on Bioelectromagnetics Call for Papers Bioelectromagnetics is the study of the effect of electromagnetic fields on biological systems. Bioelectromagnetism is studied primarily through the techniques of electrophysiology. In the late eighteenth century, the Italian physician and physicist Luigi Galvani first recorded the phenomenon while dissecting a frog at a table where he had been conducting experiments with static electricity. As one of most important worldwide problems in the modern life, bioelectromagnetics is of great attractions to researchers. In this special issue, we intend to invite front-line researchers and authors to submit original researches and review articles on exploring bioelectromagnetics. Potential topics include, but are not limited to: Bioelectromagnetic healing Numerical analysis of bioelectromagnetic fields Design of biomedical instruments Beneficial biological effects of non-ionizing electromagnetic fields Electromagnetic stimulation of human tissue Electromagnetic modeling of human body Electromagnetic interference with medical devices Authors should read over the journal’s Authors’ Guidelines carefully before submission. Prospective authors should submit an electronic copy of their complete manuscript through the journal’s Paper Submission System. Please kindly notice that the “Special Issue” under your manuscript title is supposed to be specified and the research field “Special
    [Show full text]
  • Testimony of Professor Martin Blank Before the British Columbia Utilities Commission
    COMMONWEALTH OF VIRGINIA BEFORE THE STATE CORPORATION COMMISSION APPLICATION OF ) ) PATH ALLEGHENY VIRGINIA ) TRANSMISSION CORPORATION ) CASE NO. PUE 2009-00043 ) For approval and certificate of electric ) Transmission facilities under Va. Code ) Sec. 56-46.1 and the Utilities Facilities Act, ) Va. Code sec. 65-265.1 et seq. ) DIRECT TESTIMONY AND EXHIBITS OF PROFESSOR MARTIN BLANK DEPARTMENT OF PHYSIOLOGY AND CELLULAR BIOPHYSICS COLLEGE OF PHYSICIANS AND SURGEONS COLUMBIA UNIVERSITY SUBMITTED ON BEHALF OF RESPONDENTS ALFRED T. GHIORZI AND IRENE A. GHIORZI 1 Q: Please state your name and business address. Ans: My name is Martin Blank. I am a professor at Columbia University, as well as a consultant on scientific matters related to my research on electromagnetic fields (EMF). My consulting business address is 157 Columbus Drive, Tenafly, NJ 07670. Q: Please summarize your educational and professional background. Ans: I have PhD degrees from Columbia University and University of Cambridge. I am an Associate Professor in the Department of Physiology and Cellular Biophysics at Columbia University, College of Physicians and Surgeons, where I have been teaching and doing research for over 45 years. I have taught Medical Physiology to first year medical, dental and graduate students, including a year as Course Director in charge of 250 students. However, my primary responsibility has been to conduct research, and I have specialized in the effects of EMF on cell biochemistry and cell membrane function. My most recent research is on health related effects of electromagnetic fields (EMF), primarily on stress protein synthesis and enzyme function. I have lectured on my research around the world.
    [Show full text]
  • LITERATUR-ÜBERSICHT Review-Artikel
    Forschungsstiftung Tel. +41 (0)44 632 59 78 Mobilkommunikation Fax: +41 (0)44 632 11 98 Research Foundation [email protected] Mobile Communication www.mobile-research.ethz.ch LITERATUR-ÜBERSICHT (einzelne Artikel erscheinen thematisch mehrfach) Review-Artikel Hug K.; Rapp R.; Hochfrequente Strahlung und Gesundheit. Nachtrag A. Umweltmaterialien Nr. 162 2004; Bern: BUWAL Hossmann K.A.;Hermann D.M.: Effects of electromagnetic radiation of mobile phones on the central nervous system. Bioelectromagnetics 2003: 24 (1), 49-62. Hansson Mild K.;Hardell L.;Kundi M.;Mattsson M.O.: Mobile telephones and cancer: Is there really no evidence of an association? (Review). Int J Mol Med 2003: 12 (1), 67-72. Van Rongen E.;Roubos E.W.;Van Aernsbergen L.M.;Brussaard G.;Havenaar J.;Koops F.B.;Van Leeuwen F.E.;Leonhard H.K.;Van Rhoon G.C.;Swaen G.M.;Van De Weerdt R.H.;Zwamborn A.P.: Mobile phones and children: Is precaution warranted?. Bioelectromagnetics 2004: 25 (2), 142-4. Kundi M.: Mobile phone use and cancer. Occup Environ Med 2004: 61 (6), 560-70. Hardell L.;Hansson Mild K.;Sandstrom M.;Carlberg M.;Hallquist A.;Pahlson A.: Vestibular schwannoma, tinnitus and cellular telephones. Neuroepidemiology 2003: 22 (2), 124-9. Silny J.; Meyer M.; Wiesmüller G.; Dott W.: Gesundheitsrelevante Wirkungen hochfrequenter elektromagnetischer Felder des Mobilfunks und anderer neuer Kommunikationssysteme. Umweltmed Forsch Prax 2004: 9 (3), 127-136. Mann K.;Roeschke J.: Sleep under exposure to high-frequency electromagnetic fields. Sleep Med Rev 2004: 8 (2), 95-107. Lawrentschuk N.;Bolton D.M.: Mobile phone interference with medical equipment and its clinical relevance: a systematic review.
    [Show full text]
  • Displacement Current and Ampère's Circuital Law Ivan S
    ELECTRICAL ENGINEERING Displacement current and Ampère's circuital law Ivan S. Bozev, Radoslav B. Borisov The existing literature about displacement current, although it is clearly defined, there are not enough publications clarifying its nature. Usually it is assumed that the electrical current is three types: conduction current, convection current and displacement current. In the first two cases we have directed movement of electrical charges, while in the third case we have time varying electric field. Most often for the displacement current is talking in capacitors. Taking account that charge carriers (electrons and charged particles occupy the negligible space in the surrounding them space, they can be regarded only as exciters of the displacement current that current fills all space and is superposition of the currents of the individual moving charges. For this purpose in the article analyzes the current configuration of lines in space around a moving charge. An analysis of the relationship between the excited magnetic field around the charge and the displacement current is made. It is shown excited magnetic flux density and excited the displacement current are linked by Ampere’s circuital law. ъ а аа я аъ а ъя (Ива . Бв, аав Б. Бв.) В я, я , я , яя . , я : , я я. я я, я я . я . К , я ( я я , я, я я я. З я я я. я я. , я я я я . 1. Introduction configurations of the electric field of moving charge are shown on Fig. 1 and Fig. 2. First figure represents The size of electronic components constantly delayed potentials of the electric field according to shrinks and the discrete nature of the matter is Liénard–Wiechert and this picture is not symmetrical becomming more obvious.
    [Show full text]
  • Notes 4 Maxwell's Equations
    ECE 3317 Applied Electromagnetic Waves Prof. David R. Jackson Fall 2020 Notes 4 Maxwell’s Equations Adapted from notes by Prof. Stuart A. Long 1 Overview Here we present an overview of Maxwell’s equations. A much more thorough discussion of Maxwell’s equations may be found in the class notes for ECE 3318: http://courses.egr.uh.edu/ECE/ECE3318 Notes 10: Electric Gauss’s law Notes 18: Faraday’s law Notes 28: Ampere’s law Notes 28: Magnetic Gauss law . D. Fleisch, A Student’s Guide to Maxwell’s Equations, Cambridge University Press, 2008. 2 Electromagnetic Fields Four vector quantities E electric field strength [Volt/meter] D electric flux density [Coulomb/meter2] H magnetic field strength [Amp/meter] B magnetic flux density [Weber/meter2] or [Tesla] Each are functions of space and time e.g. E(x,y,z,t) J electric current density [Amp/meter2] 3 ρv electric charge density [Coulomb/meter ] 3 MKS units length – meter [m] mass – kilogram [kg] time – second [sec] Some common prefixes and the power of ten each represent are listed below femto - f - 10-15 centi - c - 10-2 mega - M - 106 pico - p - 10-12 deci - d - 10-1 giga - G - 109 nano - n - 10-9 deka - da - 101 tera - T - 1012 micro - μ - 10-6 hecto - h - 102 peta - P - 1015 milli - m - 10-3 kilo - k - 103 4 Maxwell’s Equations (Time-varying, differential form) ∂B ∇×E =− ∂t ∂D ∇×HJ = + ∂t ∇⋅B =0 ∇⋅D =ρv 5 Maxwell James Clerk Maxwell (1831–1879) James Clerk Maxwell was a Scottish mathematician and theoretical physicist.
    [Show full text]
  • Modelling of the Electrochemical Treatment of Tumours
    TRITA-KET R115 ISSN 1104-3466 ISRN KTH/KET/R-115-SE MMOODDEELLLLIINNGG OOFF TTHHEE EELLEECCTTRROOCCHHEEMMIICCAALL TTRREEAATTMMEENNTT OOFF TTUUMMOOUURRSS EVA NILSSON DOCTORAL THESIS Department of Chemical Engineering and Technology Applied Electrochemistry Royal Institute of Technology Stockholm 2000 AKADEMISK AVHANDLING som med tillstånd av Kungliga Tekniska Högskolan i Stockholm, framlägges till offentlig granskning för avläggande av teknisk doktorsexamen fredagen den 10 mars 2000 kl. 13.00 i Kollegiesalen, Valhallavägen 79, Kungliga Tekniska Högskolan, Stockholm. ABSTRACT The electrochemical treatment (EChT) of tumours entails that tumour tissue is treated with a continuous direct current through two or more electrodes placed in or near the tumour. Promising results have been reported from clinical trials in China, where more than ten thousand patients have been treated with EChT during the past ten years. Before clinical trials can be conducted outside of China, the underlying destruction mechanism behind EChT must be clarified and a reliable dose-planning strategy has to be developed. One approach in achieving this is through mathematical modelling. Mathematical models, describing the physicochemical reaction and transport processes of species dissolved in tissue surrounding platinum anodes and cathodes, during EChT, are developed and visualised in this thesis. The considered electrochemical reactions are oxygen and chlorine evolution, at the anode, and hydrogen evolution at the cathode. Concentration profiles of substances dissolved in tissue, and the potential profile within the tissue itself, are simulated as functions of time. In addition to the modelling work, the thesis includes an experimental EChT study on healthy mammary tissue in rats. The results from the experimental study enable an investigation of the validity of the mathematical models, as well as of their applicability for dose planning.
    [Show full text]