电磁分析与应用期刊(英文)最新文献_第10页

New Formulation of the Mulilayer Iterative Method: Application to Coplanar Lines with Thick Conductor 多层迭代法的新公式:在厚导体共面线中的应用

电磁分析与应用期刊(英文) Pub Date : 2016-09-02 DOI: 10.4236/JEMAA.2016.89019

R. Mejri, T. Aguili

引用次数: 1

Electromagnetic Modulation of Dipole Antenna inside an Infinite Rectangular Waveguide Using MoM-GEC 利用MoM-GEC对无限矩形波导内偶极子天线进行电磁调制

电磁分析与应用期刊(英文) Pub Date : 2016-09-02 DOI: 10.4236/JEMAA.2016.89016

H. Messaoudi, A. Mourad, T. Aguili

引用次数: 2

Investigation of Thermal Losses in a Soft Magnetic Composite Using Multiphysics Modelling and Coupled Material Properties in an Induction Heating Cell 利用多物理场建模和耦合材料特性研究感应加热电池中软磁复合材料的热损耗

电磁分析与应用期刊(英文) Pub Date : 2016-09-02 DOI: 10.4236/JEMAA.2016.89018

Leif Siesing, K. Frogner, T. Cedell, M. Andersson

引用次数: 3

Experiment of Frequency Range Dependent TE10 to TE20 Mode Converter 频率范围相关的TE10 - TE20模式转换器实验

电磁分析与应用期刊(英文) Pub Date : 2016-09-02 DOI: 10.4236/JEMAA.2016.89017

Y. Kokubo, T. Kawai

引用次数: 1

Relativity and the Solar Wind: The Maxwell-Equation Origins of the Solar-Wind Motional Electric Field 相对论与太阳风:太阳风运动电场的麦克斯韦方程起源

电磁分析与应用期刊(英文) Pub Date : 2016-08-23 DOI: 10.4236/JEMAA.2016.88014

J. Borovsky

{"title":"Relativity and the Solar Wind: The Maxwell-Equation Origins of the Solar-Wind Motional Electric Field","authors":"J. Borovsky","doi":"10.4236/JEMAA.2016.88014","DOIUrl":"https://doi.org/10.4236/JEMAA.2016.88014","url":null,"abstract":"The motional electric field of the solar wind as seen by the Earth is examined theoretically and with spacecraft measurements. As it flows outward from the sun, the solar-wind plasma carries a spatially structured magnetic field with it. To calculate the motional electric field of the solar wind the spatially structured magnetic field is Lorentz transformed; for a full physical understanding, it is also necessary to Lorentz transform the current densities and charge densities in the solar wind. Referring to Maxwell’s equations, two related questions are asked: 1) Is the source of the solar-wind motional electric field charge density in the solar wind, time derivatives of current densities in the solar wind, or both? 2) Is the solar-wind motional electric field at Earth an electrostatic field, an induction field, or a superposition of the two? A Helmholtz decomposition of the motional electric field of the solar wind is made into a divergence-origin (electrostatic) and a curl-origin (induction) electric field. The global electric field associated with the outward advection of the global Parker-spiral magnetic field is found to be electrostatic with its origin being a distributed charge density in the solar-wind plasma. The electrostatic versus induction nature of the time-varying electric field associated with the advection of mesoscale magnetic structure varies with time as differently shaped magnetic structures in the solar-wind plasma pass the Earth; the mesoscale structure of the solar-wind plasma contains sheets of space charge and sheets wherein the current density has nonzero time derivatives.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"26 1","pages":"133-151"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

The Characteristic Analysis of the Electromagnetic Valve in Opening and Closing Process for the Gas Injection System 注气系统电磁阀启闭过程特性分析

电磁分析与应用期刊(英文) Pub Date : 2016-08-23 DOI: 10.4236/JEMAA.2016.88015

Lin Yin, Changshui Wu

引用次数: 8

Radio Wave Propagation Experiment in Sugarcane Fire Environments 甘蔗火灾环境下无线电波传播试验

电磁分析与应用期刊(英文) Pub Date : 2016-07-21 DOI: 10.4236/JEMAA.2016.87013

Douglas Letsholathebe, Kgakgamatso Marvel Mphale, S. Chimidza, M. Heron

{"title":"Radio Wave Propagation Experiment in Sugarcane Fire Environments","authors":"Douglas Letsholathebe, Kgakgamatso Marvel Mphale, S. Chimidza, M. Heron","doi":"10.4236/JEMAA.2016.87013","DOIUrl":"https://doi.org/10.4236/JEMAA.2016.87013","url":null,"abstract":"Large fires have an effect of suppressing Very or Ultra High Frequency \u0000(VHF/UHF) radio wave signals strength which consequently impact negatively on \u0000the efficiency of radio communications at the frequency ranges. Mobile \u0000hand-held radio operating at the frequency ranges is a major communication tool \u0000during fire suppression; therefore inefficient radio communication systems put \u0000lives of fire fighters at risk. One of the causes of signal attenuation in fire \u0000environment is plume ionization. Plume species which include graphitic carbon, \u0000alkalis and thermally excited radicals such as methyl are responsible for \u0000ionization. As atmospheric pressure ionized medium (combustion plasma), \u0000sugarcane fire has momentum transfer electron-neutral collision frequency much \u0000higher than plasma frequency, hence propagation of VHF/UHF radio waves through \u0000such a medium is predicted to suffer a significant attenuation and phase shift. \u0000Radiowave propagation measurements were carried out in a moderate intensity \u0000prescribed sugarcane fire at 151 MHz frequency over a 590 m path using a \u0000radiowave interferometer. The radio wave interferometer measured signal \u0000attenuation of 0.43 dB through the fire with maximum temperature and flame depth \u0000of 1154 K and 8.7 m, respectively.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"08 1","pages":"124-131"},"PeriodicalIF":0.0,"publicationDate":"2016-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Effect of Electromagnetic Fields with the Mg 2+ Cyclotron Frequency on Mouse Reproductive Performance Mg +回旋频率电磁场对小鼠生殖性能的影响

电磁分析与应用期刊(英文) Pub Date : 2016-07-21 DOI: 10.4236/JEMAA.2016.87012

G. Gerardi, A. Ninno, V. Ferrari, S. Mazzariol, D. Bernardini, S. Segato

{"title":"The Effect of Electromagnetic Fields with the Mg 2+ Cyclotron Frequency on Mouse Reproductive Performance","authors":"G. Gerardi, A. Ninno, V. Ferrari, S. Mazzariol, D. Bernardini, S. Segato","doi":"10.4236/JEMAA.2016.87012","DOIUrl":"https://doi.org/10.4236/JEMAA.2016.87012","url":null,"abstract":"The present study is aimed to test whether exposure to electromagnetic fields of very weak intensity (≤1 mT) and low frequency (≤100 Hz) may influence reproductive performance and induce teratogenesis in mice. We speculate that a resonant effect occur when the applied frequency matches the cyclotron frequency of Mg2+ (≈60 Hz) involved in the cell duplication. Four groups of mice (four dams and one male each) were exposed to ?50 μT electromagnetic field continuous irradiation of for 100 days. A control group (four dams and one male) was also examined. The exposed dams exhibited a significantly lower number of offspring per birth than the control ones (11.0 vs. 11.6; P = 0.006). A significantly lower average daily gain of body weight per mouse was observed (0.74 vs. 0.77 g/d; P = 0.002), resulting in a reduction of the average body weight per nest at 11 days of age (404 vs. 463 g; P = 0.048). Post mortem examinations revealed a significant increase in mild chronic hepatic inflammatory findings (28 vs. 0%; P = 0.001) in the offspring and myocardial hypertrophy (25 vs. 0%; P = 0.023) in the dams. The exposure of mice to an electromagnetic field with the cyclotron frequency of Mg2+ during pregnancy caused a measurable effect on the reproductive performance in terms of offspring per birth. This finding may be considered as a warning about the environmental effects of the electromagnetic fields on the stability of individual species and ecosystems.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"08 1","pages":"115-123"},"PeriodicalIF":0.0,"publicationDate":"2016-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Measurement of the Generalized Stokes Parameters of a Radially Polarized Random Electromagnetic Beam 径向极化随机电磁波束广义Stokes参数的实验测量

电磁分析与应用期刊(英文) Pub Date : 2016-06-17 DOI: 10.4236/JEMAA.2016.86011

Yongxin Liu, Songjie Luo, J. Puri, Zenghui Gao

{"title":"Experimental Measurement of the Generalized Stokes Parameters of a Radially Polarized Random Electromagnetic Beam","authors":"Yongxin Liu, Songjie Luo, J. Puri, Zenghui Gao","doi":"10.4236/JEMAA.2016.86011","DOIUrl":"https://doi.org/10.4236/JEMAA.2016.86011","url":null,"abstract":"Utilizing the Young’s double slits and Mach-Zehnder interferometer, we proposed an experimental method to measure the generalized Stokes parameters of a radially polarized random electromagnetic beam. After the partially coherent beam propagating through the Young’s double slits, the interference fringe is obtained by the help of a Mach-Zehnder interferometer consisting of apertures, quarter-wave plates and polarizers. The electric cross-spectral density matrix is detected by the coherence degree of interference fringe and the density of each single slit. The generalized Stokes parameters can be obtained from the electric cross-spectral density matrix. This experiment measures the generalized Stokes parameters of the random electromagnetic beam successfully. The results show that the spectral degree of coherence for copolarized cases (xx and yy) is similar with that for cross-polaried cases (xy and yx) for the radially polarized random electromagnetic beam. This method will help us determine the change of the polarization and coherence of the light in propagation by detecting the change of the generalized Stokes parameters.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"08 1","pages":"109-114"},"PeriodicalIF":0.0,"publicationDate":"2016-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A New Approach Based on Iterative Method for the Characterization of a Micro-Strip Line with Thick Copper Conductor 基于迭代法表征厚铜导体微带线的新方法

电磁分析与应用期刊(英文) Pub Date : 2016-05-30 DOI: 10.4236/JEMAA.2016.85010

R. Mejri, T. Aguili

{"title":"A New Approach Based on Iterative Method for the Characterization of a Micro-Strip Line with Thick Copper Conductor","authors":"R. Mejri, T. Aguili","doi":"10.4236/JEMAA.2016.85010","DOIUrl":"https://doi.org/10.4236/JEMAA.2016.85010","url":null,"abstract":"In this work, we applied two electromagnetic models for the characterization \u0000of a planar structure including a flat, thick copper conductor. Indeed the first \u0000model is consisted by modeling two metal ribbons without bulkiness, placed one above \u0000the other at a distance of h2 equal to the thickness of the thick conductor. This approach has been implemented \u0000and tested by the iterative method. The results of simulations have been \u0000compared with those calculated by the Ansoft HFSS software, and they are in \u0000good concordance, validating the method of analysis used. The second model is based \u0000on the calculation of the effective permittivity of the medium containing the thick \u0000conductor. This medium consists of a metallic region of complex relative permittivity , the rest of this medium \u0000is filled with air er2 = 1. The effective permittivity eeff calculated from these two relative permittivity er2 and . Comparing the simulation \u0000results of this new formulation of the iterative method with those calculated by \u0000the software Ansoft HFSS shows that they are in good matching which validates the \u0000second model.","PeriodicalId":58231,"journal":{"name":"电磁分析与应用期刊(英文)","volume":"8 1","pages":"95-108"},"PeriodicalIF":0.0,"publicationDate":"2016-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70292707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3