电流变流体的研究进展

电流变流体是近年来逐渐受人们重视的一种功能材料，本文介绍其国内、外发展过程及研究现状。     

智能型可控硅低频电源系统中的零电流检测电路

在矿井提升系统中,低频电源被广泛应用于提升的减速、爬行阶段,大大地提高了提升系统的运行效率和安全性。简单介绍了智能型可控硅低频电源系统的工作原理,并主要针对系统中的零电流检测问题,应用高速光耦合元件6N137设计了零电流检测电路,给出了高速光耦合元件6N137的结构和工作原理。该电路缩短了检测的时间,并提高了检测的准确性,使系统的输出性能得到很大的改善。     

德国艾柯夫SL-500采煤机变频器故障及分析

晋城煤业集团引进德国艾柯夫SL-500采煤机,在使用过程中,短时间内连续出现多台变频器烧坏现象,这在艾柯夫采煤机使用过程中是从未有过的事,也给本公司的原煤生产造成了很大影响。为了杜绝此类事情的再次发生,特对本次的故障排除方法进行了认真的分析总结,为今后应用与修理采煤机提供了意见。     

A simplified cascade current‐source inverter interconnected to a single‐phase three‐wire distribution system and its application to electric energy storage systems with batteries

A novel current source inverter system interconnected to the single‐phase grid is proposed. It has the same construction as the conventional three‐phase current source inverter that is interconnected to the single‐phase three‐wire distribution system. Though the proposed circuit has no output transformer, it can be equivalently performed as the single‐phase double cascade inverter by diverting the pole transformer in the utility system. By controlling the appropriate scheme, the output currents can be obtained as the five‐level waveforms and their distortions can be decreased sufficiently. It is applied to the interactive electric energy storage system with batteries and the basic discharging characteristics are discussed experimentally. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(2): 50–61, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10380     

电晕放电注入双向拉伸聚丙烯薄膜驻极性能的探讨

以一种双向拉伸聚丙烯（ＢＯＰＰ）薄膜在不同温度下进行恒温处理，然后进行负电晕驻极。结果表明，ＢＯＰＰ薄膜随恒温处理的温度升高，热刺激电流（ＴＳＣ）峰值愈低。利用经验方法，估算了它们的活化能，并探讨了导致ＴＳＣ峰温变化的原因。     

基于8098单片机的伏安特性测量系统的设计

伏安特性测量技术有着广泛用途。本文介绍一种用８０９８单片机为控制核心的智能化通用伏安特性测量系统的设计要点。包括系统的硬件和软件设计，以及针对实际问题所采用的一些设计技巧。成果分析表明，采用８０９８单片机有着独特的优越性和推广价值。     

V型天线的行波加载公式

本文研究了ｖ型天线上电流分布与阻抗加载的关系，导出了支持天线上行波电流的阻抗加载公式。讨论了天线张角、振子半径以及振子长度与加载量的关系和规律，说明了加载Ｖ型天线的宽带特性。文中还计算了在高斯脉冲激励下，不同加载量的天线上瞬态电流的分布，由此可以表明所导加载公式的正确性与重要性。     

带曲率补偿的带隙基准电流源的设计

简单介绍了带隙基准源的基本原理,给出了一款基于Widlar结构的带曲率补偿的带隙基准电压电流源的设计方法,通过采用TSMC₀.5μm工艺库对电路进行仿真,在-40～150℃的温度范围内,其带隙基准的输出具有12ppm/℃的温度系数,电流基准的输出具有42ppm/℃。此外,文中还对曲率补偿电路的工作原理进行了分析,并且通过仿真波形对曲率补偿的工作机制进行了讨论。     

模拟集成温度传感器设计

介绍了一种模拟集成温度传感器的电路设计。该电路利用双极性晶体管基极-发射极结压降与热力学温度T成比例的关系来实现温度的测量,并在6μm双极工艺线上投片成功。该电路在常温25℃下输出298.2μA的电流,在-55℃～150℃的工作温度范围内的误差不超过±3℃,非线性度误差不超过±0.4℃。     

Robots positioning control revisited

Positioning control systems for robot arms are presented within a general framework in view of unification and classification. Treating coupling torques from other links as an external disturbance reduces the design of the control system to that of SISO servomechanisms driving each of the robot axes individually. A short survey of many control strategies proposed in the literature presents them as different methods aiming at attenuation of this disturbance. The use of disturbance observers is shown to provide a nice and simple way for that purpose. This could be applied to the improvement of actual industrial robots at the cost of slight software modifications.