Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238292
Xia Ying-qing, Yang He-lin, Xu Peng-gen, Liu Wu
This paper presents a quick and effective arithmetic to search geminate cells where secondary scattering exists between them, and establishes a secondary scattering theory model in the near-field. The secondary incidence field on a cell is decided by geometrical optics (GO). And physical optics (PO) decides the secondary scattering field. It can also be applied to far-field and near-field.
{"title":"Predicting the secondary electromagnetic reflection on the complex targets","authors":"Xia Ying-qing, Yang He-lin, Xu Peng-gen, Liu Wu","doi":"10.1109/CEEM.2003.238292","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238292","url":null,"abstract":"This paper presents a quick and effective arithmetic to search geminate cells where secondary scattering exists between them, and establishes a secondary scattering theory model in the near-field. The secondary incidence field on a cell is decided by geometrical optics (GO). And physical optics (PO) decides the secondary scattering field. It can also be applied to far-field and near-field.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126261018","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238592
Z. Mengli, Wang Qiang, Shi Chang-sheng
A new method to calculate the coupling between a spatial electromagnetic wave and parallel transmission lines on a PCB is presented. The antenna reciprocity theorem is introduced to avoid the complex scattering problem by calculating the radiation of the parallel lines. Besides, the coupling length is defined to describe the coupling voltage of the loads; its frequency characteristics are also discussed.
{"title":"A new method to calculate the coupling between spatial electromagnetic wave and parallel transmission lines on PCB","authors":"Z. Mengli, Wang Qiang, Shi Chang-sheng","doi":"10.1109/CEEM.2003.238592","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238592","url":null,"abstract":"A new method to calculate the coupling between a spatial electromagnetic wave and parallel transmission lines on a PCB is presented. The antenna reciprocity theorem is introduced to avoid the complex scattering problem by calculating the radiation of the parallel lines. Besides, the coupling length is defined to describe the coupling voltage of the loads; its frequency characteristics are also discussed.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123116913","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238649
Li Jing, Wang Jin, Guo Guozhen, Guo Yao, Jian Zhong
To study the effects of the electromagnetic pulses (EMP) on the electrical activity of the brain, chronic electrode implantation techniques were developed to record the multichannel EEG signals, and the approximate entropy was applied to study the changes in EEG after the rats were exposed to EMP. Sixteen rats were randomly divided into 2 groups, EMP group and sham exposure group. EEG was recorded before and after EMP exposures repeatedly. ApEn was then calculated to evaluate the effects of EMP on EEG. The results showed that: (1) the ApEn of the normal EEG ranged between 0.30 and 0.71, and ApEn in different brain areas of the normal rats was not symmetrically distributed; (2) after the exposure, ApEn of the EEG in the exposed rats were significantly increased (P<0.01) except for Ch7 and Ch15. This indicated that exposed to EMP may result in the changes of the electrical activity of the brain under the given experiment conditions.
{"title":"Effects of electromagnetic pulses on approximate entropy of multichannel EEG in freely moving rats","authors":"Li Jing, Wang Jin, Guo Guozhen, Guo Yao, Jian Zhong","doi":"10.1109/CEEM.2003.238649","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238649","url":null,"abstract":"To study the effects of the electromagnetic pulses (EMP) on the electrical activity of the brain, chronic electrode implantation techniques were developed to record the multichannel EEG signals, and the approximate entropy was applied to study the changes in EEG after the rats were exposed to EMP. Sixteen rats were randomly divided into 2 groups, EMP group and sham exposure group. EEG was recorded before and after EMP exposures repeatedly. ApEn was then calculated to evaluate the effects of EMP on EEG. The results showed that: (1) the ApEn of the normal EEG ranged between 0.30 and 0.71, and ApEn in different brain areas of the normal rats was not symmetrically distributed; (2) after the exposure, ApEn of the EEG in the exposed rats were significantly increased (P<0.01) except for Ch7 and Ch15. This indicated that exposed to EMP may result in the changes of the electrical activity of the brain under the given experiment conditions.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126030891","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238348
LiuYi-ping, Shen Bao-li
An electromagnetic leakage problem often appears at a shielding door's aperture, and the usual method to resolve it is to apply some kind of electrical gasket to the shielding door. The finger-reed is a typical electrical gasket with broad application. The influence of the dimensions of a finger-reed structure on shielding efficiency is first analyzed by FDTD method. Then, the shielding efficiency for an electromagnetic pulse is investigated when a finger shaped reed is installed in an aperture of a metal structure. The computational results coincide well with those of experimental results. Finally, some conclusions, which may provide a helpful reference for practical engineering, are obtained.
{"title":"The analysis of the shielding efficiency for the hermetic structure with the finger-reed","authors":"LiuYi-ping, Shen Bao-li","doi":"10.1109/CEEM.2003.238348","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238348","url":null,"abstract":"An electromagnetic leakage problem often appears at a shielding door's aperture, and the usual method to resolve it is to apply some kind of electrical gasket to the shielding door. The finger-reed is a typical electrical gasket with broad application. The influence of the dimensions of a finger-reed structure on shielding efficiency is first analyzed by FDTD method. Then, the shielding efficiency for an electromagnetic pulse is investigated when a finger shaped reed is installed in an aperture of a metal structure. The computational results coincide well with those of experimental results. Finally, some conclusions, which may provide a helpful reference for practical engineering, are obtained.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114066651","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238487
T. Tang
One of the issues faced by manufacturers of fluorescent luminaires is the vast number of models they have to contemplate in the light of an EMC compliance regime. By modelling the luminaire's electrical circuit with lumped elements, this paper investigates the insertion loss performance of a number of fluorescent luminaires, and the effects of the power-factor correction capacitor on the insertion loss performance, to enable a quick evaluation of each luminaire model.
{"title":"Modelling fluorescent luminaires for EMC compliance assessment","authors":"T. Tang","doi":"10.1109/CEEM.2003.238487","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238487","url":null,"abstract":"One of the issues faced by manufacturers of fluorescent luminaires is the vast number of models they have to contemplate in the light of an EMC compliance regime. By modelling the luminaire's electrical circuit with lumped elements, this paper investigates the insertion loss performance of a number of fluorescent luminaires, and the effects of the power-factor correction capacitor on the insertion loss performance, to enable a quick evaluation of each luminaire model.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122794730","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238412
H. Pankratz, G. Mrozynski
The calculation of transient electromagnetic fields is important because of the increasing demands on system design under EMC constraints. The shielding effectiveness of a screen is characterized by the time dependence of the electromagnetic energy transfer into the shielded area caused by switched or pulsed sources. The total energy which is radiated by the transient wave can be calculated by integrating Poynting's vector over an appropriate closed surface and over the time interval between the switching moment and infinity. In this work the power and energy balance for the electromagnetic fields excited by electromagnetic sources in the presence of a plane conducting and permeable screen are presented. Also, the results obtained by the quasi-stationary method are compared to those calculated via the full-dynamic approach.
{"title":"Power transfer of transient electromagnetic fields through a plane conducting screen of finite thickness","authors":"H. Pankratz, G. Mrozynski","doi":"10.1109/CEEM.2003.238412","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238412","url":null,"abstract":"The calculation of transient electromagnetic fields is important because of the increasing demands on system design under EMC constraints. The shielding effectiveness of a screen is characterized by the time dependence of the electromagnetic energy transfer into the shielded area caused by switched or pulsed sources. The total energy which is radiated by the transient wave can be calculated by integrating Poynting's vector over an appropriate closed surface and over the time interval between the switching moment and infinity. In this work the power and energy balance for the electromagnetic fields excited by electromagnetic sources in the presence of a plane conducting and permeable screen are presented. Also, the results obtained by the quasi-stationary method are compared to those calculated via the full-dynamic approach.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132665165","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238409
Shaofeng Yu, J. Zou, Jinliang He, R. Zeng, Yanqing Gao, Jian Guo
A new numerical method based on the Chebyshev equation is applied to analyze the transient characteristics of a grounding system electrode under lightning current in this paper. The time-variable parameters caused by the soil ionization effect around the grounding conductor are considered. It shows this numerical method is an effective one and the ionization effect of the grounding conductor cannot be ignored. This result is validated by comparison with the results in literature.
{"title":"Time-domain analysis method of lightning transient characteristics of grounding electrode","authors":"Shaofeng Yu, J. Zou, Jinliang He, R. Zeng, Yanqing Gao, Jian Guo","doi":"10.1109/CEEM.2003.238409","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238409","url":null,"abstract":"A new numerical method based on the Chebyshev equation is applied to analyze the transient characteristics of a grounding system electrode under lightning current in this paper. The time-variable parameters caused by the soil ionization effect around the grounding conductor are considered. It shows this numerical method is an effective one and the ionization effect of the grounding conductor cannot be ignored. This result is validated by comparison with the results in literature.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131772830","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238342
L. Tang, Wei Yuan, Xin Wang, Zongqian Li
In active microwave remote sensing of soil moisture, the electric field scattered by the soil surface contains information about the soil. Three kinds of a priori knowledge hypotheses are considered for their influence on soil moisture inversion. The neural network (NN) toolbox in MATLAB is used to invert the soil moisture and compute the soil moisture error produced by the uncertainty of these three kinds of hypotheses.
{"title":"Information of soil moisture extraction from microwave scattered field","authors":"L. Tang, Wei Yuan, Xin Wang, Zongqian Li","doi":"10.1109/CEEM.2003.238342","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238342","url":null,"abstract":"In active microwave remote sensing of soil moisture, the electric field scattered by the soil surface contains information about the soil. Three kinds of a priori knowledge hypotheses are considered for their influence on soil moisture inversion. The neural network (NN) toolbox in MATLAB is used to invert the soil moisture and compute the soil moisture error produced by the uncertainty of these three kinds of hypotheses.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124339710","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238189
T. V. Kartseva
The paper presents the approximate estimation of the PMD in an optical fibre, that occurs as a consequence of the electromagnetic field of a lightning stroke to earth in the vicinity of the fibre cable. The estimation is based on an analogy with the calculation of PMD in a fibre with eccentricity. A small rotation of the polarization plane of light in a fibre under the influence of a lightning field causes the same distribution of orthogonal modes to the main axis as a small eccentricity. Estimation can be made by this method if rotation is less than 20 grad.
{"title":"Estimation of polarization mode dispersion (PMD) value in optical fibre during lightning strokes","authors":"T. V. Kartseva","doi":"10.1109/CEEM.2003.238189","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238189","url":null,"abstract":"The paper presents the approximate estimation of the PMD in an optical fibre, that occurs as a consequence of the electromagnetic field of a lightning stroke to earth in the vicinity of the fibre cable. The estimation is based on an analogy with the calculation of PMD in a fibre with eccentricity. A small rotation of the polarization plane of light in a fibre under the influence of a lightning field causes the same distribution of orthogonal modes to the main axis as a small eccentricity. Estimation can be made by this method if rotation is less than 20 grad.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125221867","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}
Pub Date : 1900-01-01DOI: 10.1109/CEEM.2003.238289
Huajie Yin, L. Lin
A new algorithm to couple the element free Galerkin method (EFG) with FEM is proposed to deal with the boundary and interface continuity problem met in the EFG method. Its discrete equation is deduced, and some computation examples for EM problems are given. The results show that the boundary conditions are applied as well as FEM.
{"title":"A new EFG-FEM algorithm for electromagnetic computation","authors":"Huajie Yin, L. Lin","doi":"10.1109/CEEM.2003.238289","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238289","url":null,"abstract":"A new algorithm to couple the element free Galerkin method (EFG) with FEM is proposed to deal with the boundary and interface continuity problem met in the EFG method. Its discrete equation is deduced, and some computation examples for EM problems are given. The results show that the boundary conditions are applied as well as FEM.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131846628","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}
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