耐压击穿装置的容量问题

根据影响介质击穿的主要因素，本文着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件两极间的等效电容值，同时还要估计到试件在击穿过程可能产生的最大击穿电流值。对于某种绝缘材料或构件，合理选用耐压击穿装置的容量对正确进行试验是很重要的。     

耐压击穿装置的负荷指标问题

根据影响绝缘材料击穿的主要因素 ,阐述了交流耐压击穿装置的负荷指标问题。在确定耐压击穿装置的负荷时 ,不仅要考虑到试件两极之间的等效电容 ,同时还要估计到试件在击穿过程可能产生的最大击穿电流值。对于某种绝缘材料或构件 ,合理选定击穿装置的负荷值对正确进行试验是很重要的。     

击穿耐压装置的容量问题

根据影响介质击穿的主要因素，本文着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件两极间的等效电容值，同时还要估计到试件在击穿过程可能产生的最大击穿电流值，对于某种绝缘材料或物件，合理选用耐压击穿装置的容量对正确进行试验是很主要的。     

抗电击穿装置的容量指标

根据影响介质击穿的主要因素,阐述了交流抗电击穿装置的容量指标问题。说明在确定抗电击穿装置的容量时, 不仅要考虑到被试样件两级之间的等效电容值, 同时还要估计到试样在击穿过程可能产生的最大击穿电流值     

抗电击穿装置的容量指标

根据影响介质击穿的主要因素，阐述了交流抗电击穿装置的容量指标问题。说明在确定抗电击穿装置的容量时，不仅要考虑到被试样件两级之间的等效电容值，同时还要估计到试样在击穿过程可能产生的最大击穿电流值。     

耐压击穿装置的容量指标问题

根据影响绝缘介质击穿的主要因素，着重阐述了交流耐压击穿装置的容量指标问题。在确定耐压击穿装置的容量时，不仅要考虑到被试样件在两极间的等效电容值，理学要估计到样件在击穿过程可能产生的最大击穿电流值。对于某种绝缘或构件，合理选定击穿装置的容量对正确进行试验是很重要的。     

薄栅SiO_2相关击穿电荷的研究

在恒流应力条件下,用时间相关介质击穿(TDDB)特性,研究了Ar-O_2热生长SiO_2的时间相关击穿的电荷性质。研究结果表明:(1)相关击穿电荷(Q_(BD))不是常数,而是与氧化层电场强度(E_(OX))有关;(2)阳极相关击穿电场(E_(BD))近似为常数;(3)电场加速因子( β)不是常数,它亦不是与E_(OX)~(-2)成正比,而是呈更为复杂的电场依赖关系。     

耐压测试仪的原理和使用

耐压测试是安规测试中重要项目,然而耐压测试仪的使用仍存在许多问题.本文对上述仪器的原理和正确使用进行了介绍.     

关于电子枪绝缘陶瓷高压击穿的研究

对具有250 kV阳极电压的KMF-1017大功率微波电子管电子枪绝缘陶瓷发生介质击穿的主要原因进行了分析,并探讨了防止电子枪绝缘陶瓷发生介质击穿的办法。     

The annealing effect for structural, optical and electrical properties of dysprosium–manganese oxide films grown on Si substrate

Samples of (Dy–Mn) oxide thin films were prepared on quartz and Si(p) substrates for optical and electrical investigations. These samples were annealed at different temperatures and characterised by UV–VIS absorption spectroscopy, X-ray fluorescence (XRF) and X-ray diffraction (XRD). The XRF spectrum was used to determine the weight fraction ratio of Mn to Dy in the prepared samples. The XRD shows that Dy oxide and Mn oxide prevent each other to crystallise alone or making a solid solution even at 600 °C. However, compound of DyMnO₃ was formed through the solid-state reaction for T > 800 °C. The ac-conductance and capacitance were studied, as a function of frequency and gate voltage and the fixed and interface charge densities were determined. It was found that the “correlated barrier hopping” CBH model controls the frequency dependence of the conductivity, while the Kramers–Kronig (KK) relations explain the frequency dependence of the capacitance. The parameters of CBH model were determined and show that the ac-conduction in crystalline (Dy–Mn) oxide is realised by bipolaron mechanism, where the barrier height of hopping is equal to the bandgap determined the UV–VIS absorption spectroscopy.     

电子发射材料粉体物性指数的研究

为了选用具有优良流动性的钨粉,我们采用日本MT-1000多功能型粉体物性测定仪研究电子发射材料粉体物性指数,并且给出该材料的流动性评价。这有助于我们在生产阴极时,选用具有优良流动性的钨粉,从而进一步稳定阴极生产工艺。     

On Downlink Beamforming Methods: Capacity and Error Probability Performance

In space-division multiple access (SDMA), different beamforming or space-domain precoding techniques can be applied. We investigate two different space-domain precoding methods, the maximum capacity (MC) and the minimum mean square error (MMSE) precoders, for the downlink channel. It is shown that the MMSE precoding, which is practically implementable, can provide a reasonable performance in terms of the capacity and error probability, while the MC precoding is not practical (although it is optimum in terms of the capacity). Space-domain precoding methods are also applied to code-division multiple access (CDMA) systems.This work was supported by the HY-SDR Research Center at Hanyang University, Seoul, Korea, under the ITRC Program of MIC, Korea.Jinho Choi was born in Seoul, Korea. He recieved the B.E. degree (magna cum laude) in electronics engineering from Sogang University in 1989 and the M.S.E. and Ph.D. degree in electrical engineering from the Korea Advanced Institute of Science and Technology in 1991 and 1994, respectively. Currently he is a Senior Lecturer in the School of Electrical Engineering and Telecommunications,University of New South Wales, Australia. Dr. Choi received the 1999 Best Paper Award of Signal Processing from EURASIP.Seungwon Choi received the B.S. degree from Hanyang University, Seoul, Korea, in 1980 and the M.S. degree from Seoul National University, Seoul, in 1982, both the electronic engineering. He received the M.S. degree in computer engineering in 1985 and the Ph.D degree in electrical engineering in 1988 from Syracuse University, Syracuse, NY.From 1982 to 1984, he was with LG Electronics Co. Ltd., Seoul, where he helped developed the 8-mm camcorder system. From 1988 to 1989, he was with the Department of Electrical and Computer Engineering, Syracuse University, as an Assistant Professor. In 1989, he joined the Electronics and Telecommunications Research Institute, daejeon, Korea, where he developed the adaptive algorithm for real-time application in secure telephone systems. From 1990 to 1992, he was with yhe Communication Research Laboratory, Tokyo, Japan, as a science and Technology Agency Fellow, developing adaptive antenna array system and adaptive equalizing filters for applications in land-mobile communications. He joined Hanyang University, Seoul, in 1992 as an Assistant Professor. He is a Professor in the School of Electrical and Computer Engineering, Hanyang University. His research interests include digital communications and adaptive signal processing with a recent focus on the real-time implementation of smart antenna system for 3G mobile communication system.     

窗片介质材料对输出窗功率容量的影响

本文介绍了研制大功率速调管的过程中输出窗的失效现象,比较了两种窗片介质材料氧化铍与氧化铝的性能特点;通过实际制管后的热测数据证明,相同条件下窗片材料氧化铍比氧化铝对输出窗的功率容量的提高更显著,在研制大功率速调管过程中窗片材料氧化铍是比氧化铝更为优良的介质材料.     

薄膜介质材料特性参数的测试技术

在分析采用接触式电极测量薄膜介质材料特性参数所存在问题的基础上，介绍了一种非接触式电极的测量原理和方法，并提出水银探针电极的测试技术。     

基于DSP芯片的液晶特性专用测试仪研制

以TMS320LF2407DSP芯片为核心研制了一种液晶特性专用测试仪,测试液晶材料在不同电压和不同频率的电性能,得到被测材料在高压情况下的一系列响应特性,为研究其击穿特性和失效机理提供直接实验数据,为液晶显示材料的选择提供重要依据。介绍了液晶特性专用测试仪的功能、测试原理、系统组成、主要硬件电路和软件设计思想。     

AC PDP介质保护膜材料的选择

随着对交流等离子体显示板电压变化原因的探讨，新型表面保护材料的开发研究以及为除去污染而对制造工艺的调整，ＡＣＰＤＰ正在获得极好寿命特性。介质保护膜直接与放电气体相接触，其材料和表面状况是决定ＡＣＰＤＰ寿命及放电性的重要因素，因而保护膜材料的选择尤为重要。     

浅谈继电保护装置的绝缘性能试验及提高措施

本文根据作者多年来对继电保护产品质量检测经验总结而出,比较详细地阐述了有关继电保护产品绝缘性能的引用标准、检测方法、检测过程中比较常见的一些问题及解决这些问题的方案.内容浅显易懂,希望能对需要这方面实践经验的读者有所帮助.