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.2003.238485
Xue Qianzhong, Zhangkunshu, Chen Zhiyu
This paper derives in detail the horizontal radiated electric fields from an electrically small radiator which should be well represented by the leading multipole moments, namely, the electric dipole and the magnetic moments, correcting Lee's corresponding formula. A sequence of GTEM cell measurements is made to determine the equivalent dipole moments of the device under test (DUT). Based on the correlation between GTEM cell and OATS emission measurements, theoretical simulation for DUT emissions over an open area test site (OATS) have been made. Theoretical results and experimental data measured directly over OATS are compared with good agreement.
{"title":"Test of correlation between GTEM cell and open area test site emission measurements","authors":"Xue Qianzhong, Zhangkunshu, Chen Zhiyu","doi":"10.1109/CEEM.2003.238485","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238485","url":null,"abstract":"This paper derives in detail the horizontal radiated electric fields from an electrically small radiator which should be well represented by the leading multipole moments, namely, the electric dipole and the magnetic moments, correcting Lee's corresponding formula. A sequence of GTEM cell measurements is made to determine the equivalent dipole moments of the device under test (DUT). Based on the correlation between GTEM cell and OATS emission measurements, theoretical simulation for DUT emissions over an open area test site (OATS) have been made. Theoretical results and experimental data measured directly over OATS are compared with good agreement.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"60 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":"115698211","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.2003.238066
W. Thammasiriroj, S. Ruayariyasub, W. Khan-ngern, S. Nitta
The paper proposes a process to predict and analyze conducted electromagnetic interference (EMI) emission using the impedance mismatch approach. Five steps of this process are introduced and analyzed. The impedance mismatch criterion is proposed based on current and voltage waveforms in the time domain. The impedance mismatch fixtures and EMI measured results show how the impedance ratio and conducted EMI emission are related. The work was done using a class E zero-voltage switching (ZVS) resonant inverter at various load conditions - unity, lagging and leading power factors. The experimental results show good agreement with simulated results, which are accomplished by the MATLAB program.
{"title":"The effect of impedance mismatch on the conducted EMI emission","authors":"W. Thammasiriroj, S. Ruayariyasub, W. Khan-ngern, S. Nitta","doi":"10.1109/CEEM.2003.238066","DOIUrl":"https://doi.org/10.1109/CEEM.2003.238066","url":null,"abstract":"The paper proposes a process to predict and analyze conducted electromagnetic interference (EMI) emission using the impedance mismatch approach. Five steps of this process are introduced and analyzed. The impedance mismatch criterion is proposed based on current and voltage waveforms in the time domain. The impedance mismatch fixtures and EMI measured results show how the impedance ratio and conducted EMI emission are related. The work was done using a class E zero-voltage switching (ZVS) resonant inverter at various load conditions - unity, lagging and leading power factors. The experimental results show good agreement with simulated results, which are accomplished by the MATLAB program.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"20 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":"114781458","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.2003.237872
Gui-shu Liang, Hong-wei Zhou, Hua-ying Dong, Zhang Zhono-yuan, Z. Cheng
Computer simulation of partial discharge pulse propagation on one bay of GIS is performed by EMTP-ATP., which provides a reference for PD detection and location. The joint time-frequency analysis method is used for the pattern recognition of partial discharge, and the recognition results are better than other methods.
{"title":"Joint time-frequency analysis on PD pulse signals in GIS","authors":"Gui-shu Liang, Hong-wei Zhou, Hua-ying Dong, Zhang Zhono-yuan, Z. Cheng","doi":"10.1109/CEEM.2003.237872","DOIUrl":"https://doi.org/10.1109/CEEM.2003.237872","url":null,"abstract":"Computer simulation of partial discharge pulse propagation on one bay of GIS is performed by EMTP-ATP., which provides a reference for PD detection and location. The joint time-frequency analysis method is used for the pattern recognition of partial discharge, and the recognition results are better than other methods.","PeriodicalId":129734,"journal":{"name":"Asia-Pacific Conference on Environmental Electromagnetics, 2003. CEEM 2003. Proceedings.","volume":"1025 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":"123124013","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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