2005 12th International Symposium on Electrets最新文献_第3页

The theory and its simulation of ferroelectric phase transition of VDF/TrFE copolymers VDF/TrFE共聚物铁电相变理论及其模拟

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612338

S. Ikeda, D. Fukuzawa, A. Nishioka, T. Koda

引用次数: 0

Effect of electron beam radiation on permittivity in PMMA 电子束辐射对PMMA介电常数的影响

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612397

F. Zheng, Yewen Zhang, Xiaoqing Zhang, Chun Xiao, Shangyi Fu, Bin Gong, Jianwei Zhu

引用次数: 1

New electret charger and charge reader systems 新的驻极体充电器和电荷阅读器系统

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612415

M. Parada, P. Petchevist, A. de Almeida, N. C. Silva, J. Campos, D. Ila

{"title":"New electret charger and charge reader systems","authors":"M. Parada, P. Petchevist, A. de Almeida, N. C. Silva, J. Campos, D. Ila","doi":"10.1109/ISE.2005.1612415","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612415","url":null,"abstract":"Electrets are candidate materials for radiation dosimetry with applications in medical physics. Dosimeters produced with electret materials are able to detect /spl gamma/ - and X-rays, /spl alpha/, /spl beta/, electrons and other charged particles and, with appropriate converters, fast and slow neutrons. To produce and use an electret dosimeter one must have a system to inject an initial charge into the electret material, and another system to read and compare the initial charge with that remaining after the radiation exposure. We have developed a charging device to produce large area thin film electrets using corona discharge with an array of 130 electrodes. Also we have developed one reader and improved another that accurately measure the electret charge density. The first is a plane plate reader connected to an electrometer that measures an induced charge from which the average charge density on the electret can be inferred. The second is a coaxial probe that, together with a scanning system can record 2D images of non uniform exposures on an electret dosimeter film with a spatial resolution determined by the dimensions of the probe and its distance from the film. We report results from both of these charge readers and compare electrets produced from 25 /spl mu/m thick ETFE (Ethylenetetrafluoroethylene),PFA (Tetrafluoropropylene-per-fluoromethoxyethylene) and FEP (Tetrafluoroethylene-hexa-fluoropropylene) polymer films. We demonstrate that the corona charging technique and both reading systems are adequate for electret film dosimeter measurements. We present the relationship between the responses from the two reading systems and we show that the planar probe is more sensitive and rapidly measures average exposure.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128438571","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

The analysis of multilayer piezoelectric transformer 多层压电变压器的分析

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612346

Wu Zhiming, Ye Xinghong, Jiang Guangzhong

引用次数: 3

Charge density limits in polymer film electrets 聚合物薄膜驻极体的电荷密度限制

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612382

M. Parada, H. Zaias, A. de Almeida, D. Ila

引用次数: 3

Effect of ultraviolet and gamma sterilization on charge storage stability for porous PTFE film electrets 紫外线和伽马灭菌对多孔PTFE薄膜驻极体电荷储存稳定性的影响

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612321

Xiaoping Wang, Jian Jiang, L. Cui, M. Song, Z. Xia

{"title":"Effect of ultraviolet and gamma sterilization on charge storage stability for porous PTFE film electrets","authors":"Xiaoping Wang, Jian Jiang, L. Cui, M. Song, Z. Xia","doi":"10.1109/ISE.2005.1612321","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612321","url":null,"abstract":"Medical products of PTFE electret that come in contact with the body or bodily fluids must be sterilized before use. That sterilization method is selected is important because the stability of space charge in electrets may be affected differently to various forms of sterilization. In this paper, charge storage stability in porous polytetrafluoroethylene (PTFE) film electrets were investigated by means of corona charging at room or elevated temperature, isothermal and thermal stimulating surface potential decay, as well as open-circuit thermally stimulated discharge (TSD) current spectra after ultraviolet (UV) and gamma (cobalt 60) radiation sterilization. The results showed that the surface potential remain above 95% of the original level in porous PTFE after UV-irradiation in the range of 3.2 mW/cm/sup 2/ for 2 hours, however, the charges injected in porous PTFE were almost completely removed after radiation with gamma-radiation at doses of 15 kGy. UV-irradiated porous PTFE films, one side coated with aluminum electrodes and negative corona charged, show peak position shifts towards the higher temperature in their TSD curves as compared with those of unirradiated samples. It is available for sterilizing medical electret products of porous PTFE films by UV radiation.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127459941","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

Influence of pressure expanding treatment on electret properties of polypropylene cellular 压力膨胀处理对聚丙烯蜂窝材料驻极体性能的影响

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612416

Z. Xia, Feipeng Wang, Xiaomin Qiu, X. Qiu, Jun Shen

引用次数: 2

Polarons in polysilanes: theoretical background and experimental detection 聚硅烷中的极化子:理论背景和实验检测

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612359

S. Nespurek, A. Kadashchuk, I. I. Fishchuk, V. Arkhipov, E. V. Emelianova

引用次数: 1

An investigation of interaction between DDVP and BuChE and the related analytical application using QCM DDVP与BuChE相互作用的研究及其QCM分析应用

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612436

Hong-juan Zeng, Cuiping Cheng, Yun Ye, Yadong Jiang, G. Xie, Wei Li

{"title":"An investigation of interaction between DDVP and BuChE and the related analytical application using QCM","authors":"Hong-juan Zeng, Cuiping Cheng, Yun Ye, Yadong Jiang, G. Xie, Wei Li","doi":"10.1109/ISE.2005.1612436","DOIUrl":"https://doi.org/10.1109/ISE.2005.1612436","url":null,"abstract":"Polyvinyl pyrrolindone (PVP) and PVP with butyl cholinesterase (BuChE) were deposited respectively on quartz crystal microbalance (QCM) in order to investigate the adsorptive sensitivity of o,o-dimethyl-o-2, 2-dichlorvinyl phosphate (DDVP). It shows that the adsorption of DDVP on the surface of BuChE belongs to monomolecular layer and is much more sensitive than on the surface of PVP. The maximum coverage on the electrode surface is about 5.304/spl times/I0/sup -10/ mol/cm/sup 2/. This area is corresponding to active sites of BuChE. It is calculated that a monomolecular layer of DDVP adsorbs in the active site serine of BuChE which is deeply located at the bottom of a narrow (20 /spl Aring/) gorge and takes up more space at the extent of 10 /spl Aring/. The poisoned mechanism of BuChE by DDVP has also been discussed. The linear relationship between the frequency and the concentration of DDVP exists in a range from 6.54ppm to 32.7ppm. This method has also been applied to determine DDVP in several samples of organophosphorus pesticides. The present results of our studies are quite satisfactory.","PeriodicalId":364651,"journal":{"name":"2005 12th International Symposium on Electrets","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127924309","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

Real charges and frozen-in polarization in PET electrets PET驻极体中的实电荷和冻结极化

2005 12th International Symposium on Electrets Pub Date : 2005-09-11 DOI: 10.1109/ISE.2005.1612368

E. Motyl, T. Krause

引用次数: 2