A Simulation of Electromagnetic Field Exposure to Biological Tissues
|
|
- Tracey Richards
- 5 years ago
- Views:
Transcription
1 8 th South-East Asian Congress of Medical Physics, Biophysics & Medical Engineering, Des 10-13, Bandung, Indonesia A Simulation of Electromagnetic Field Exposure to Biological Tissues Warindi 1, Hamzah Berahim 2, Suharyanto 2, Sasongko Pramono Hadi 2 1 Department of Electrical Engineering, Faculty of Engineering, University of Mataram, Indonesia 2 Department of Electrical Engineering and Information Technology, Faculty of Engineering, Gadjah Mada University, Yogyakarta, Indonesia Abstract - The success application of electromagnetic based medical equipment is determined by mechanism and properties of the exposure and object. In this simulation, biological tissues are modeled as conductive medium. A Finite Element Method (FEM) is used as a tool to solve the models. Two assumptions are made, firstly the tissue is assumed as homogenous and the second as heterogeneous media. The results are graphical presentations shown the intensity of the electromagnetic field for both assumptions. From the experiment it is shown that the density of the field is smaller in the less conductive tissue. Keywords - electromagnetic, biological tissues, FEM I. INTRODUCTION Exposure of electromagnetic to human body may occur unintentionally or intentionally. The unintended one comes from foreign electromagnetic source as side effect (e.g. radiations of high voltage transmission line, mobile phone, electrical machine etc). [1]. some study in this category have been widely presented, e.g. investigation the electric field intensity of the power line [2] [3] and a mobile phone operation [4]. In the other hand, electromagnetic field effects have established and developing uses in medicine. In medicine, electromagnetic can be categorized as nonionizing radiation (e.g. MRI, electroporation [5], [6] defibrillation [7], etc) and ionizing radiation (e.g. X rays, CT [8]). The determination of the tissue composition is based on the fact that the electrical characteristics of the human tissue changes according to the relative amounts of fluid and tissues. Materials, such as blood or muscle, have a higher conductivity in comparison to bones or fat and a lung filled with air has a lower conductivity than a water filled one respectively. Obviously the tissue is a heterogeneous matter [9]. The success medical application is determined by the mechanism and properties of the exposure and the object [10], [11]. Because real measurement may not possible in the real condition therefore a simulation is needed. This paper presents a simulation study of exposing electromagnetic wave to biological tissues with emphasis on the effect of tissue composition (homogen or heterogen). It is done by exploitation of the finite element method to model exposing electromagnetic wave. II. MATERIAL AND METHODS A. BIOLOGICAL TISSUE MODEL The general strategy is to simulate as simple a model of defibrillation as possible while still capturing the basic physics. In particular, we seek the effect of different assumption by comparing two approaches. The model could be made more realistic in many ways, but will make the solutions more complex. In this simulation, the biological tissues are modeled as conductive medium (electrolyte). The electrical properties of the modeled tissues refer to conductivity σ in the reference paper [9], e.g. body fluid is 1.5 S/m, muscle is 0.34, Fat is S/m and Heart S/m. Firstly the tissue is assumed as homogenous and the second as heterogeneous media. Model used by [9] and [10] which mainly an electronic equivalent of the biological system. In first assumption, the homogenous tissue is assumed as conductivity of body fluid of 1.5 S/m. In the heterogeneous media uses combination of two tissues e.g. muscle with body fluid in its surrounding that has conductivity of 0.3 and 1.5 S/m respectively. The biological tissue is shaped as a square shape (body fluid) and a circle in the middle of it (muscle). B. ELECTRODES Real application such as defibrillation mostly uses circular shape [9]. The electromagnetic field emit from electrode. Two cylindrical electrodes with a distance and diameter of 10 cm and 2 cm are used. The voltage difference between electrodes is 1000 V. Circle electrodes are used in the first and second experiments. For the third experiment, it uses square shape electrodes of (area of 2 x 2 cm) to investigate the effect of different electrodes shape to the electromagnetic intensity in the biological tissue.
2 8 th South-East Asian Congress of Medical Physics, Biophysics & Medical Engineering, Des 10-13, Bandung, Indonesia C. FORMULATION The simulation is conducted using numerical experiments program MATLAB finite element method (FEM). It refers to [2] and [12] the simulation methodology can be formulized as follows: a biological tissue with conductivity σ and a steady current is established. The current density J is related to the electric field E through: J = σe (1) Combining the continuity equation: J = Q (2) electromagnetic exposition. The calculations took into account the electrodes shape variation. D. RESULTS The results are graphical presentations that show the intensity of the electromagnetic field for both assumptions. The result for the first experiment is shown in the figure 1. It is an electric field distribution with equipotential shown as line curve. The left electrode is positive side and the right side is negative voltage. Where Q is a current source, with the definition of the electric potential V yields the elliptic Poisson's equation: - (σ V) = Q (3) The partial derivative equation parameters are the conductivity σ and the current source Q. The Dirichlet boundary condition assigns values of the electric potential V to the boundaries. The Neumann boundary condition requires the value of the normal component of the current density (n (σ (V))) to be known. It is also possible to specify a generalized Neumann condition defined by n (σ V) + qv = g (4) Where q can be interpreted as a film conductance for thin plates. The electric potential V, the electric field, and the current density are all available for plotting. Other quantities to visualize are the current lines (the vector field of) and the equipotential lines of V. The equipotential lines are orthogonal to the current lines when σ is isotropic. Two circular metallic conductors are placed on a plane. The physical model for this problem consists of the Laplace equation - (σ V) = 0 (5) For the electric potential V, the natural Neumann boundary condition on the outer boundaries is V n = 0 Presented investigations were orientated at establishing the conditions, in which the determination of tissue current can be replaced by numerical calculations of two dimensional (2D) homogeneous model of biological tissue, accurately enough to evaluate the occupational exposure according to numerical simulations results. Geometrical and electrical parameters (high, radius and electric conductivity corresponding to tissue) were appointed for the homogeneous and heterogeneous models of the tissues. This procedure permits simulation of inside tissue (6) Fig.1. The potential (contour lines) and electric field (arrows) distributions in and around the circular tissue during an exposing in a of a homogeneous media With the same data except the assumption, the result for the second experiment is shown in the figure 2. The media is heterogeneous with conductivity of 1.5 S/m for the outer media as the majority portion and 0.3 S/m for the inner media as shown a circular media in the centre.
3 8 th South-East Asian Congress of Medical Physics, Biophysics & Medical Engineering, Des 10-13, Bandung, Indonesia The comparison of current distribution is shown in figure 4. Fig.2. The potential (contour lines) and electric field (arrows) distributions in and around the circular tissue during an exposing in a heterogeneous media By changing the shape of electrode to a square shape and with the other data remaining the same as the second experimentation, the result is presented in the figure 3. Fig. 4. The current counter lines distributions in and around the circular tissue during an exposing of a homogeneous media with circular shape electrodes Fig. 3. The potential (contour lines) and electric field (arrows) distributions in and around the circular tissue during an exposing of a heterogeneous media with square shape electrodes Fig. 5. The current counter lines distributions in and around the circular tissue during an exposing of a homogeneous media with circular shape electrodes The summary of the experiments is presented in the table 1. Three parameters are shown to explain the comparisons i.e. electric field, potential, and current density. In the first line, it
4 8 th South-East Asian Congress of Medical Physics, Biophysics & Medical Engineering, Des 10-13, Bandung, Indonesia shows only maximum electrical potential at the object. This occurs at circle which closes to the electromagnetic source. Second line shows the current density in the middle of the object. At the end this shows maximum electric field. Table 1. Summary of the results Parameter Exp. 1 Exp. 2 Exp. 3 Max Electrical potential, V (Volt) Current Density at centre, J (A/cm) Max. Electric Field, V/cm E. DISCUSSIONS First experiment (fig. 1) shows that using homogeneous approach gives linear distribution of the electric field. The object does not affect to the distribution of the field. From the second experiment (fig. 2) using heterogeneous media assumption, the electric field potential is changing when touch the object because of different conductivity. It can be seen that the electric potential become higher, it means the impedance in the object is higher or the conductivity is smaller. The total corresponding current density through object becomes smaller (table 1). The results of simulation indicate that assumption of biological tissue model with homogeneous structure and its electrical parameters, may not sufficient for estimation of current that flow through it. The heterogeneous approach is better for modeling the real condition. From the third experiment (fig 3) it is shown that the density of the electric field is merely the same as second experiment but different direction in same part. The flat portion of electrodes that faces the object influences the concentration (directing) of the electric field. The results of numerical experimentation have showed that use homogenous models have higher result that it should be. The heterogeneous model can be helpful to evaluate tissue exposure in the electric field and for supporting medical applications. exposure in the electric field and for managing of safety and effectiveness of electro medical applications. REFERENCES 1. Raines J K (1981) Electromagnetic field interactions With the human body: observed effects and theories. Greenbelt, Maryland 2. Hoang L H, Scoretti R, Burais N, & Voyer D, (2009) Numerical dosimetry of induced phenomena in the human body by three phase power line. IEEE Trans.Magnetics Vol 45,No Yuan Shangzun, Li Pengfei, Nie Ling (2008) Study on electromagnetic radiation of ultra-high voltage power transmission line. IEEE Int l Conf Comp Sci & Inf Tech /08 DOI /ICCSIT Boonwutiwiwat R, kulworawanichpong T, & Pao-La-Or P (2007) Electric Field Distribution Resulting from a Mobile Phone Human Interfacing With an Overhead Power Transmission Line. Proc. WSEAS Conf Power Systems, Beijing, China. 5. Krassowska W & Filev P D (2007) Modeling Electroporation in a Single Cell. Biophysical J 92: pp Ellappan P, Sundararajan R (2005) A simulation study of the electrical model of a biological cell. J Electrostatics Vol 63: Smaill B H, LeGrice I J, Hooks D A, Pullan A J, Caldwell B J & Hunter P J (2004) Cardiac structure and electrical activation: Models and measurement. Proc. Australian Phys & Phar Soc. 34: Song X, Bai J (2008) An Improved Finite-element based Reconstruction Algorithm for Fluorescence Tomography. IEEE Congress on Image and Signal Processing /08 DOI /CISP Beckmann L, Riesen D, Leonhardt S (2007) Optimal electrode placement and frequency range selection for the detection of lung water using Bioimpedance Spectroscopy. Proc. 29th IEEE Int l Conf. EMBS Cité Internationale, Lyon, France, FrB Muzdeka S and Barbieri E (2005) Control theory inspired considerations of the mathematical models of defibrillation. Proc 44th IEEE Conf on Decision & Control, European Control Conf Seville, Spain, ThB Lai D, Cao T, Wu X, and Fang Z (2007) Optimization of Electrodes Displacement for Transthoracic Defibrillation: A Simulation Study on Spatial Configuration Pattern. Int l J Bioelectromagnetism : 9, Matworks (2009) Partial Diferential Equation Toolbox. Matwork, Inc. Address of the corresponding author: Author: Warindi Institute: University of Mataram Street: Jl. Majapahit 62 City: Mataram Country: Indonesia warindi_mtr@yahoo.co.id F. CONCLUSIONS The electromagnetic exposure to biological tissues is depending on tissue medium properties. The results of computer calculations indicate that assumption of biological tissue model with homogeneous structure and parameters, may not sufficient for estimation of current that flow through it. The results of numerical calculation have showed that use heterogeneous models can be helpful to evaluate tissue
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Available online at ScienceDirect. Procedia Engineering 170 (2017 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 170 (2017 ) 410 415 Engineering Physics International Conference, EPIC 2016 Impedance Measurement System of a Biological Material
More informationNumerical Analyze of Corona Discharge on HVDC Transmission Lines
Numerical Analyze of Corona Discharge on HVDC Transmission Lines H. Nouri, A. Tabbel, N. Douib, H. Aitsaid, Y. Zebboudj Abstract This study and the field test comparisons were carried out on the Algerian
More informationDevelopment of Tetrapolar Conductivity Cell for Liquid Measurement Application
Sensors & Transducers 2014 by IFSA Publishing, S. L. http://www.sensorsportal.com Development of Tetrapolar Conductivity Cell for Liquid Measurement Application 1 M. N. Anas, 2 M. N. Ahmad 1 UniMAP, School
More informationThe Influence of Phase Transposing on Double Circuit Overhead Power Line Magnetic Field
The Influence of Phase Transposing on Double Circuit Overhead Power Line Magnetic Field LIVIU NEAMł, LIVIU EMIL PETREAN, OLIVIAN CHIVER, ZOLTAN ERDEI Electrical Engineering Department North University
More informationChapter 30 X Rays GOALS. When you have mastered the material in this chapter, you will be able to:
Chapter 30 X Rays GOALS When you have mastered the material in this chapter, you will be able to: Definitions Define each of the following terms, and use it in an operational definition: hard and soft
More informationTheoretical questions for the final exam ED 2012.
Theoretical questions for the final exam ED 2012. 1. Radiation a) Properties and types of radiation b) Physical parameters of radiation 2. Law of attenuation of radiation a) Experimental interpretation
More informationBases of radioisotope diagnostic methods
Medical, pharmaceutical applications of radioisotopes Bases of radioisotope diagnostic methods Dr. István Voszka Basis of application: radioisotopes have identical behavior in the organism to corresponding
More informationCHAPTER THREE SYMMETRIC BENDING OF CIRCLE PLATES
CHAPTER THREE SYMMETRIC BENDING OF CIRCLE PLATES * Governing equations in beam and plate bending ** Solution by superposition 1.1 From Beam Bending to Plate Bending 1.2 Governing Equations For Symmetric
More informationo Two-wire transmission line (end view is shown, the radius of the conductors = a, the distance between the centers of the two conductors = d)
Homework 2 Due Monday, 14 June 1. There is a small number of simple conductor/dielectric configurations for which we can relatively easily find the capacitance. Students of electromagnetics should be sure
More informationTechnical University of Denmark
Technical University of Denmark Page 1 of 11 pages Written test, 9 December 2010 Course name: Introduction to medical imaging Course no. 31540 Aids allowed: none. "Weighting": All problems weight equally.
More informationMagnetic Field Analysis
NISA - EMAG EMAG is the electromagnetic module of the family of general purpose finite element based program NISA. It can determine electric and magnetic field distributions in a wide class of electromagnetic
More informationMagnetoacoustic tomography with current injection
Article Progress of Projects Supported by NSFC Materials Science October 23 Vol.58 No.3: 36366 doi:.7/s434-3-5964-2 Magnetoacoustic tomography with current injection LIU GuoQiang *, HUANG Xin,2, XIA Hui
More informationSound wave bends as it hits an interface at an oblique angle. 4. Reflection. Sound wave bounces back to probe
: Ultrasound imaging and x-rays 1. How does ultrasound imaging work?. What is ionizing electromagnetic radiation? Definition of ionizing radiation 3. How are x-rays produced? Bremsstrahlung Auger electron
More informationAn impedance method for spatial sensing of 3D cell constructs towards applications in tissue engineering
Electronic Supplementary Material (ESI) for Analyst. This journal is The Royal Society of Chemistry 2015 Supporting Information: An impedance method for spatial sensing of 3D cell constructs towards applications
More informationThe Distortion Influence Simulation and Experimental Study of Human Body to High Voltage Power Frequency Electric Field
, pp.13-20 http://dx.doi.org/10.14257/ijca.2013.6.6.02 The Distortion Influence Simulation and Experimental Study of Human Body to High Voltage Power Frequency Electric Field Wang Jingang, Mao Kai and
More informationA method of the forward problem for magneto-acousto-electrical tomography
Technology and Health Care 24 (216) S733 S738 DOI 1.3233/THC-16122 IOS Press S733 A method of the forward problem for magneto-acousto-electrical tomography Jingxiang Lv a,b,c, Guoqiang Liu a,, Xinli Wang
More informationMonitoring of the lung fluid movement and estimation of lung area using Electrical Impedance Tomography: A Simulation Study
Monitoring of the lung fluid movement and estimation of lung area using Electrical Impedance Tomography: A Simulation Study Deborshi Chakraborty Dept. of Instrumentation Science Jadavpur University, Kolkata:
More informationEE-353 ELECTROMAGNETICS SIMULATION LABORATORY
EE-353 ELECTROMAGNETICS SIMULATION LABORATORY DEPARTMENT OF ELECTRICAL ENGINEERING UNIVERSITY OF ENGINEERING & TECHNOLOGY, LAHORE Magnetic Field Around Current Carrying Conductors CONTACT INFORMATION Electrical
More informationMultidimensional Numerical Simulation of Glow Discharge by Using the N-BEE-Time Splitting Method
Plasma Science and Technology, Vol.14, No.9, Sep. 2012 Multidimensional Numerical Simulation of Glow Discharge by Using the N-BEE-Time Splitting Method Benyssaad KRALOUA, Ali HENNAD Electrical Engineering
More informationX-ray Interaction with Matter
X-ray Interaction with Matter 10-526-197 Rhodes Module 2 Interaction with Matter kv & mas Peak kilovoltage (kvp) controls Quality, or penetrating power, Limited effects on quantity or number of photons
More informationEMF PENETRATION IN BIOLOGICAL TISSUE WHEN EXPOSED IN THE NEAR FIELD OF A MOBILE PHONE ANTENNA
EMF PENETRATION IN BIOLOGICAL TISSUE WHEN EXPOSED IN THE NEAR FIELD OF A MOBILE PHONE ANTENNA Mihaela Morega, Alina Machedon POLITEHNICA University of Bucharest, mihaela@iem.pub.ro Abstract. The paper
More informationSCITECH Volume 4, Issue 1 RESEARCH ORGANISATION November 09, 2017
SCITECH Volume 4, Issue 1 RESEARCH ORGANISATION November 9, 17 Boson Journal of Modern Physics www.scitecresearch.com Numerical Study The Dielectric Properties And Specific Absorption Rate Of Nerve Human
More informationMedical Biophysics II. Final exam theoretical questions 2013.
Medical Biophysics II. Final exam theoretical questions 2013. 1. Early atomic models. Rutherford-experiment. Franck-Hertz experiment. Bohr model of atom. 2. Quantum mechanical atomic model. Quantum numbers.
More informationA Simulation Model of Fluid Flow and Streamlines Induced by Non-Uniform Electric Field
Proceedings of the 4th International Middle East Power Systems Conference (MEPCON ), Cairo University, Egypt, December 9-,, Paper ID 8. A Simulation Model of Fluid Flow and Streamlines Induced by Non-Uniform
More informationComputation of Electromagnetic Energy Absorption in the Human Body Tissues by High Frequency Structure Simulator
Computation of Electromagnetic Energy Absorption in the Human... Computation of Electromagnetic Energy Absorption in the Human Body Tissues by High requency Structure Simulator Md. Selim Hossain 1 and
More informationChapter 23 Electric Potential. Copyright 2009 Pearson Education, Inc.
Chapter 23 Electric Potential Units of Chapter 23 Electric Potential Energy and Potential Difference Relation between Electric Potential and Electric Field Electric Potential Due to Point Charges Potential
More informationEFFECT OF DIELECTRIC BARRIERS TO THE ELECTRIC FIELD OF ROD-PLANE AIR GAP
EFFECT OF DIELECTRIC BARRIERS TO THE ELECTRIC FIELD OF ROD-PLANE AIR GAP A. Kara 1, Ö. Kalenderli, K. Mardikyan 3 1,, 3 Istanbul Technical University, Electrical and Electronics Engineering Faculty, Istanbul,
More informationExp. #2-3 : Measurement of Equipotential Lines by Using Conducting Plates
PAGE 1/11 Exp. #2-3 : Measurement of Equipotential Lines by Using Conducting Plates Student ID Major Name Team # Experiment Lecturer Student's Mentioned Items Experiment Class Date Submission Time Submission
More informationLecture Presentation. Chapter 21. Nuclear Chemistry. James F. Kirby Quinnipiac University Hamden, CT Pearson Education, Inc.
Lecture Presentation Chapter 21, Inc. James F. Kirby Quinnipiac University Hamden, CT Energy: Chemical vs. Chemical energy is associated with making and breaking chemical bonds. energy is enormous in comparison.
More informationDEVIL PHYSICS THE BADDEST CLASS ON CAMPUS IB PHYSICS
DEVIL PHYSICS THE BADDEST CLASS ON CAMPUS IB PHYSICS TSOKOS OPTION I-2 MEDICAL IMAGING Reading Activity Answers IB Assessment Statements Option I-2, Medical Imaging: X-Rays I.2.1. I.2.2. I.2.3. Define
More informationLecture 13: Electromagnetic Theory Professor D. K. Ghosh, Physics Department, I.I.T., Bombay. Poisson s and Laplace s Equations
Poisson s and Laplace s Equations Lecture 13: Electromagnetic Theory Professor D. K. Ghosh, Physics Department, I.I.T., Bombay We will spend some time in looking at the mathematical foundations of electrostatics.
More informationNumerical Simulation Modelling for Velocity Measurement of Electromagnetic Flow Meter
Journal of Physics: Conference Series Numerical Simulation Modelling for Velocity Measurement of Electromagnetic Flow Meter To cite this article: J Z Wang et al 006 J. Phys.: Conf. Ser. 48 36 Recent citations
More information)WILEY A John Wiley and Sons, Ltd., Publication. Introduction to Biological Physics for the Health and Life Sciences
to Biological Physics for the Health and Life Sciences Kirsten Franklin Paul Muir Terry Scott Lara Wilcocks Paul Yates Staff at the University of Otago, New Zealand i )WILEY A John Wiley and Sons, Ltd.,
More informationTongue elasticity sensing. with Muscle Contraction Monitoring
Tongue Elasticity Sensing with Muscle Contraction Monitoring Akihide Shibata, Mitsuru Higashimori, Ixchel G. Ramirez-Alpizar and Makoto Kaneko Department of Mechanical Engineering, Osaka University, 2-1
More informationWe have seen how the Brems and Characteristic interactions work when electrons are accelerated by kilovolts and the electrons impact on the target
We have seen how the Brems and Characteristic interactions work when electrons are accelerated by kilovolts and the electrons impact on the target focal spot. This discussion will center over how x-ray
More informationChapter 23 Electric Potential. Copyright 2009 Pearson Education, Inc.
Chapter 23 Electric Potential 23-1 Electrostatic Potential Energy and Potential Difference The electrostatic force is conservative potential energy can be defined. Change in electric potential energy
More informationControlling elastic wave with isotropic transformation materials
Controlling elastic wave with isotropic transformation materials Zheng Chang, Jin Hu, a, Gengkai Hu, b, Ran Tao and Yue Wang School of Aerospace Engineering, Beijing Institute of Technology, 0008,Beijing,
More informationScaling relations for parallel disc Capacitance with Dielectric media
Scaling relations for parallel disc Capacitance with Dielectric media C. V. Krishnamurthy, Gokul Raj R Measurement and Modeling Lab Department of Physics, Indian Institute of Technology Madras Chennai-600036,
More informationA Thermodynamic Perspective on the Interaction of Radio Frequency Radiation with Living Tissue Michael Peleg 1
A Thermodynamic Perspective on the Interaction of Radio Frequency Radiation with Living Tissue Michael Peleg 1 Abstract The existence of biological effects of radio frequency (RF) radiation on living tissue
More informationModeling Motor Responses of Paraplegics under Epidural Spinal Cord Stimulation: Computational Modeling Technical Report
Modeling Motor Responses of Paraplegics under Epidural Spinal Cord Stimulation: Computational Modeling Technical Report Ellen R. Feldman and Joel W. Burdick 1 Introduction This technical report describes
More informationOptimum Design of the Structure of Electrode for Medical EIT System
Optimum Design of the Structure of Electrode for Medical EIT System Huaxiang Wang Chao Wang Automation School Automation School Tianjin University Tianjin University Tianjin, P.R. China 372 Tianjin, P.R.
More informationLecture 15 Perfect Conductors, Boundary Conditions, Method of Images
Lecture 15 Perfect Conductors, Boundary Conditions, Method of Images Sections: 5.4, 5.5 Homework: See homework file Perfect Conductors 1 metals such as Cu, Ag, Al are closely approximated by the concept
More informationUse of the magnetic field generated by the internal distribution of injected currents for Electrical Impedance Tomography (MR-EIT)
ELEKTRİK, VOL.6, NO.3, 1998, c TÜBİTAK Use of the magnetic field generated by the internal distribution of injected currents for Electrical Impedance Tomography (MR-EIT) Y. Ziya İder & Özlem Birgül Middle
More informationCALCULATION OF POWER FREQUENCY FIELDS FROM HIGH VOLTAGE OVERHEAD LINES IN RESIDENTIAL AREAS
CALCULATION OF POWER FREQUENCY FIELDS FROM HIGH VOLTAGE OVERHEAD LINES IN RESIDENTIAL AREAS I. N. Ztoupis *, I. F. Gonos and I. A. Stathopulos National Technical University of Athens, School of Electrical
More informationFinal exam questions ED
Final exam questions ED 2015-2016 1. Radiation a) Properties and types of radiation b) Physical parameters of radiation 2. Law of attenuation of radiation a) Experimental interpretation of the law b) Forms
More informationOptimization of Skin Impedance Sensor Design with Finite Element Simulations
Excerpt from the Proceedings of the COMSOL Conference 28 Hannover Optimization of Skin Impedance Sensor Design with Finite Element Simulations F. Dewarrat, L. Falco, A. Caduff *, and M. Talary Solianis
More informationChapter 21 Electric Potential
Chapter 21 Electric Potential Chapter Goal: To calculate and use the electric potential and electric potential energy. Slide 21-1 Chapter 21 Preview Looking Ahead Text: p. 665 Slide 21-2 Review of Potential
More informationAPPENDIX 8: SPECIFIC LEARNING OUTCOMES
APPENDIX 8: SPECIFIC LEARNING OUTCOMES Cluster 0 Skills and Attitudes Outcomes SENIOR 4 PHYSICS Appendices Nature of Science S4P-0-1a Explain the roles of theory, evidence, and models in the development
More informationCalculation of Electric and Magnetic Field under AC Transmission and Distribution Lines in Guwahati City
Calculation of Electric and Magnetic Field under AC Transmission and Distribution Lines in Guwahati City Manash Jyoti Baishya 1, Satyajit Bhuyan 2, N.K.Kishore 3 1 Dept.of Electrical Engineering, IIT Kharagpur,
More informationStudy and Characterization of the Limiting Thermal Phenomena in Low-Speed Permanent Magnet Synchronous Generators for Wind Energy
1 Study and Characterization of the Limiting Thermal Phenomena in Low-Speed Permanent Magnet Synchronous Generators for Wind Energy Mariana Cavique, Student, DEEC/AC Energia, João F.P. Fernandes, LAETA/IDMEC,
More informationDoppler echocardiography & Magnetic Resonance Imaging. Doppler echocardiography. History: - Langevin developed sonar.
1 Doppler echocardiography & Magnetic Resonance Imaging History: - Langevin developed sonar. - 1940s development of pulse-echo. - 1950s development of mode A and B. - 1957 development of continuous wave
More informationCOMPUTER SIMULATION OF MICROELECTRODE BASED BIO-IMPEDANCE MEASUREMENTS WITH COMSOL
COMPUTER SIMULATION OF MICROELECTRODE BASED BIO-IMPEDANCE MEASUREMENTS WITH Alberto Olmo 1 and Alberto Yúfera 2 1 Escuela Superior de Ingenieros (ESI), Dto. Física Aplicada III, Universidad de Sevilla
More informationVisualization of polarization state and its application in Optics classroom teaching
Visualization of polarization state and its application in Optics classroom teaching Bing Lei 1, *, Wei Liu 1, Jianhua Shi 1, Wei Wang 1, Tianfu Yao 1 and Shugang Liu 2 1 College of Optoelectronic Science
More informationStudy of Specific Absorption Rate (SAR) in the human head by metamaterial attachment
Study of Specific Absorption Rate (SAR) in the human head by metamaterial attachment M. T Islam 1a), M. R. I. Faruque 2b), and N. Misran 1,2c) 1 Institute of Space Science (ANGKASA), Universiti Kebangsaan
More informationManipulation on charged particle beam for RT benefit.
High Electron Beam Dose Modification using Transverse Magnetic Fields Ion Chamber Response Modification under Strong Magnetic Field Conditions Sion Koren, Radiation Oncology Preface Manipulation on charged
More informationCHAPTER 2. COULOMB S LAW AND ELECTRONIC FIELD INTENSITY. 2.3 Field Due to a Continuous Volume Charge Distribution
CONTENTS CHAPTER 1. VECTOR ANALYSIS 1. Scalars and Vectors 2. Vector Algebra 3. The Cartesian Coordinate System 4. Vector Cartesian Coordinate System 5. The Vector Field 6. The Dot Product 7. The Cross
More informationPhysics (
Question 2.12: A charge of 8 mc is located at the origin. Calculate the work done in taking a small charge of 2 10 9 C from a point P (0, 0, 3 cm) to a point Q (0, 4 cm, 0), via a point R (0, 6 cm, 9 cm).
More informationNuclear Radiation. Natural Radioactivity. A person working with radioisotopes wears protective clothing and gloves and stands behind a shield.
Nuclear Radiation Natural Radioactivity A person working with radioisotopes wears protective clothing and gloves and stands behind a shield. 1 Radioactive Isotopes A radioactive isotope has an unstable
More informationElectrical Impedance Tomography Based on Vibration Excitation in Magnetic Resonance System
16 International Conference on Electrical Engineering and Automation (ICEEA 16) ISBN: 978-1-6595-47-3 Electrical Impedance Tomography Based on Vibration Excitation in Magnetic Resonance System Shi-qiang
More informationCalculation of Electric and Magnetic Field Safety Limits Under UHV AC Transmission Lines
Calculation of Electric and Magnetic Field Safety Limits Under UHV AC Transmission Lines Manash Jyoti Baishya Dept.of Electrical Engineering IIT Kharagpur Kharagpur,India Email: manashiitkgp@gmail.com
More informationTutorial: simulating a rod pinch diode for pulsed radiography with Trak and GamBet
Tutorial: simulating a rod pinch diode for pulsed radiography with Trak and GamBet Stanley Humphries, Copyright 2012 Field Precision PO Box 13595, Albuquerque, NM 87192 U.S.A. Telephone: +1-505-220-3975
More informationELECTROMAGNETIC ENVIRONMENT GENERATED IN A TEM CELL FOR BIOLOGICAL DOSIMETRY APPLICATIONS
ISEF 2007 XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering Prague, Czech Republic, September 13-15, 2007 ELECTROMAGNETIC ENVIRONMENT GENERATED
More informationToday s menu. Last lecture. Measurement of volume flow rate. Measurement of volume flow rate (cont d...) Differential pressure flow meters
Last lecture Analog-to-digital conversion (Ch. 1.1). Introduction to flow measurement systems (Ch. 12.1). Today s menu Measurement of volume flow rate Differential pressure flowmeters Mechanical flowmeters
More informationxˆ z ˆ. A second vector is given by B 2xˆ yˆ 2z ˆ.
Directions for all homework submissions Submit your work on plain-white or engineering paper (not lined notebook paper). Write each problem statement above each solution. Report answers using decimals
More informationNEW ANALYTICAL SOLUTION FOR SOLVING STEADY-STATE HEAT CONDUCTION PROBLEMS WITH SINGULARITIES
THERMAL SCIENCE: Year 3, Vol. 7, No. 3, pp. 665-67 665 NEW ANALYTICAL SOLUTION FOR SOLVING STEADY-STATE HEAT CONDUCTION PROBLEMS WITH SINGULARITIES by Najib LARAQI a* and Eric MONIER-VINARD b a Paris West
More informationA Study of Electromagnetic Field Generated by High Voltage Lines Using Comsol Multiphysics
A Study of Electromagnetic Field Generated by High Voltage Lines Using Comsol Multiphysics B. Ali Rachedi, A. Babouri, F.Berrouk. LGEG Laboratory, Department of electrical engineering Université 8 Mai
More informationCOMSOL Thermal Model for a Heated Neural Micro-Probe
COMSOL Thermal Model for a Heated Neural Micro-Probe Matthew P. Christian*, Samara L. Firebaugh, Andrew N. Smith United States Naval Academy *Corresponding author: P.O. Box 11699, United States Naval Academy,
More informationUnit-1 Electrostatics-1
1. Describe about Co-ordinate Systems. Co-ordinate Systems Unit-1 Electrostatics-1 In order to describe the spatial variations of the quantities, we require using appropriate coordinate system. A point
More informationAn Electromagnetic-Simulation based Investigation of the Dielectric Padding Approach for Head Imaging at 7 T
7007 An Electromagnetic-Simulation based Investigation of the Dielectric Padding Approach for Head Imaging at 7 T Andreas Rennings 1, Keran Wang 1, Le Chen 1, Friedrich Wetterling 2, and Daniel Erni 1
More informationArrangement of conductors in 220 kv double circuit line to reduce E-fields in view of public exposure
Proc. 2018 Electrostatics Joint Conference 1 Arrangement of conductors in 220 kv double circuit line to reduce E-fields in view of public exposure N K Kishore, IIT Kharagpur, INDIA-721032 kishor@ee.iitkgp.ernet.in
More informationADAPTIVE SOLUTIONS OF NONLINEAR PARABOLIC EQUATIONS WITH APPLICATION TO HYPERTHERMIA TREATMENTS
ADAPTIVE SOLUTIONS OF NONLINEAR PARABOLIC EQUATIONS WITH APPLICATION TO HYPERTHERMIA TREATMENTS Bodo Erdmann, Jens Lang, Martin Seebaß Konrad-Zuse-Zentrum für Informationstechnik Berlin Takustraße 7 14195
More informationComparison of charge neutralisations of conductors and insulators with corona ionisers
Proc. 212 Joint Electrostatics Conference 1 Comparison of charge neutralisations of conductors and insulators with corona ionisers A. Ohsawa National Institute of Occupational Safety and Health, Japan
More informationDielectric properties of biological tissues at frequencies below 1 MHz. Azadeh Peyman
Dielectric properties of biological tissues at frequencies below 1 MHz Azadeh Peyman Introduction Dielectric properties of tissues: One of the main inputs required in the dosimetry studies involving electromagnetic
More informationInvestigation of SLF-EMF effects on Human Body using Computer Simulation Technology
Investigation of SLF-EMF effects on Human Body using Computer Simulation Technology MW Aslam 1*, H Ali 2, MAU Rehman 3, MAUR Bajwa 4 1, 2, 3 Research Scholar, Institute of Electrical Engineering and Computer
More informationSYLLABUS. COURSE DESCRIPTION (Course information, basic description, general information, teaching overview, required equipment and preparation, etc.
Faculty of Medicine Course title: Medical Physics and Biophysics Course coordinator: Collaborators: Slaven Jurković, PhD, Assistant Professor Diana Mance, PhD, Senior Assistant Study program: Integrated
More informationELECTRO MAGNETIC FIELDS
SET - 1 1. a) State and explain Gauss law in differential form and also list the limitations of Guess law. b) A square sheet defined by -2 x 2m, -2 y 2m lies in the = -2m plane. The charge density on the
More informationAnalysis of natural radioactivity and artificial radionuclides in soil samples in the Najran region of Saudi Arabia
Safety and Security Engineering V 675 Analysis of natural radioactivity and artificial radionuclides in soil samples in the Najran region of Saudi Arabia A. Al-Zahrany & K. S. Al-Mogabes Institute of Atomic
More informationForward Problem in 3D Magnetic Induction Tomography (MIT)
Forward Problem in 3D Magnetic Induction Tomography (MIT) Manuchehr Soleimani 1, William R B Lionheart 1, Claudia H Riedel 2 and Olaf Dössel 2 1 Department of Mathematics, UMIST, Manchester, UK, Email:
More informationInvestigation and Analysis of Inception Voltage and Field Distribution in Power Cables with Internal Cavities in Dielectric
Investigation and Analysis of Inception Voltage and Field Distribution in Power Cables with Internal Cavities in Dielectric A. A. Hossam-Eldin Electrical Eng. Department, Faculty of Engineering, Alexandria
More informationEquipotential Lines. Bởi: OpenStaxCollege
Equipotential Lines Bởi: OpenStaxCollege We can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields. Of course, the two are related. Consider [link],
More informationA Modeling Study of Electrical Characteristics of Anisotropic Conductive Film Adhesives
Excerpt from the Proceedings of the COMSOL Conference 2008 Boston A Modeling Study of Electrical Characteristics of Anisotropic Conductive Film Adhesives Ranjith Divigalpitiya 3M Canada Laboratory 3M Canada
More informationHangzhou, Zhejiang Province, P.R. China,
Thermal modelling for endocardiac radiofrequency ablation: comparison of hyperbolic bioheat equation and Pennes bioheat equation with finite element method Pengfei Liu 1,2, Jiquan Liu 1,2 and Huilong Duan
More informationMeasurement of electric potential fields
Measurement of electric potential fields Matthew Krupcale, Oliver Ernst Department of Physics, Case Western Reserve University, Cleveland Ohio, 44106-7079 18 November 2012 Abstract In electrostatics, Laplace
More informationEffects of the field dependent J/sub c/ on the vertical levitation force between a superconductor and a magnet
University of Wollongong Research Online Faculty of Engineering - Papers (Archive) Faculty of Engineering and Information Sciences 2003 Effects of the field dependent J/sub c/ on the vertical levitation
More informationEquivalent Electrical & Mechanical Networks of Human Body
2011 International Conference on Management and Service Science IPEDR vol.8 (2011) (2011) IACSIT Press, Singapore Equivalent Electrical & Mechanical Networks of Human Body Varun Gupta 1, Gavendra Singh
More informationPre-lab Quiz / PHYS 224 Electric Field and Electric Potential (B) Your name Lab section
Pre-lab Quiz / PHYS 224 Electric Field and Electric Potential (B) Your name Lab section 1. What do you investigate in this lab? 2. For two concentric conducting rings, the inner radius of the larger ring
More informationElectromagnetic Implosion Using a Lens
Sensor and Simulation Notes Note 516 July 2006 Electromagnetic Implosion Using a Lens Carl E. Baum University of New Mexico Department of Electrical and Computer Engineering Albuquerque New Mexico 87131
More informationUNIT I ELECTROSTATIC FIELDS
UNIT I ELECTROSTATIC FIELDS 1) Define electric potential and potential difference. 2) Name few applications of gauss law in electrostatics. 3) State point form of Ohm s Law. 4) State Divergence Theorem.
More informationWorking Correctly & Safely with Radiation. Talia Tzahor Radiation safety officer Tel:
Working Correctly & Safely with Radiation Talia Tzahor Radiation safety officer Tel: 5196 Email: talia.tzahor@weizmann.ac.il Environmental Exposure The typical human body contains: Potassium-40 ( 40 K)
More informationKINGS COLLEGE OF ENGINEERING DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING QUESTION BANK
KINGS COLLEGE OF ENGINEERING DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING QUESTION BANK SUB.NAME : ELECTROMAGNETIC FIELDS SUBJECT CODE : EC 2253 YEAR / SEMESTER : II / IV UNIT- I - STATIC ELECTRIC
More informationPhysics 112 Homework 2 (solutions) (2004 Fall) Solutions to Homework Questions 2
Solutions to Homework Questions 2 Chapt16, Problem-1: A proton moves 2.00 cm parallel to a uniform electric field with E = 200 N/C. (a) How much work is done by the field on the proton? (b) What change
More informationProgress In Electromagnetics Research, PIER 97, , 2009
Progress In Electromagnetics Research, PIER 97, 407 416, 2009 PRACTICAL LIMITATIONS OF AN INVISIBILITY CLOAK B. L. Zhang Research Laboratory of Electronics Massachusetts Institute of Technology MA 02139,
More informationPut Paper Number Here
Proceedings of Proceedings of icipe : rd International Conference on Inverse Problems in Engineering June,, Port Ludlow, WA, USA Put Paper Number Here NEW RECONSTRUCTION ALGORITHMS IN ELECTRICAL IMPEDANCE
More informationA MULTI-LAYER FINITE ELEMENT MODEL OF THE SURFACE EMG SIGNAL
A MULTI-LAYER FINITE ELEMENT MODEL OF THE SURFACE EMG SIGNAL M. Lowery,2, N. Stoykov,2, A. Taflove 3 and T. Kuiken,2,3 Rehabilitation Institute of Chicago, IL, USA 2 Department of Physical Medicine and
More informationMagnetic resonance imaging MRI
Magnetic resonance imaging MRI Introduction What is MRI MRI is an imaging technique used primarily in medical settings that uses a strong magnetic field and radio waves to produce very clear and detailed
More informationElectric Fields and Potentials
Electric Fields and Potentials INTRODUCTION This experiment is intended to illustrate the concepts of electric fields and electric potentials and how they are related to the charge distribution that produces
More informationELECTROMAGNETIC FIELDS AND WAVES
ELECTROMAGNETIC FIELDS AND WAVES MAGDY F. ISKANDER Professor of Electrical Engineering University of Utah Englewood Cliffs, New Jersey 07632 CONTENTS PREFACE VECTOR ANALYSIS AND MAXWELL'S EQUATIONS IN
More informationConsider a point P on the line joining the two charges, as shown in the given figure.
Question 2.1: Two charges 5 10 8 C and 3 10 8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
More informationFlashover Performance of Station Post Insulators under Icing Conditions based on Electric Field Distribution
Flashover Performance of Station Post Insulators under Icing Conditions based on Electric Field Distribution V. Jaiswal and M. Farzaneh NSERC / Hydro-Quebec / UQAC Industrial Chair on Atmospheric Icing
More informationINSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
Course Name Course Code Class Branch INSTITUTE OF AERONAUTICAL ENGINEERING Dundigal, Hyderabad - 00 0 DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING : Electro Magnetic fields : A00 : II B. Tech I
More information