如何提高农网剩余电流动作保护器的"三率"执行率

本文分析剩余电流动作保护器常见故障出现的主要原因,并对如何提高农网剩余电流动作保护器的"三率"执行率进行探讨,以期对运行和管理提供借鉴.     

多措并举有效提高剩余电流动作保护器投运率

供电企业在农村低压电网中已普遍使用剩余电流动作保护器装置，实践证明，其在安全用电方面发挥着非常重要的作用。由于影响剩余电流动作保护器投运率的因素很多，因此在实际运行管理过程中，投运率并不高。本文就如何提高剩余电流动作保护器投运率，提出一些切实可行的管理办法。     

一种新型的电气火灾监控报警系统应用探讨

电气设计时电源总进线处开关的剩余电流设定值较大,产生少量漏电时供电开关难以动作;而电路中绝缘破损有接地故障时产生的电弧限制了故障电流,使漏电保护器不能动作,但其产生的高温易引起电气火灾,类似的情况下就需要进行泄漏电流的监测和报警。电气火灾监控报警系统能实时监测回路的剩余电流值、箱体的温度,当电流值越限、温度超标时,系统能实现声光报警,并与消防火灾报警系统实现联动。本文网络版地址：http：//www.eepw.com.cn/article/274763.htm     

低压剩余电流动作保护器拒动故障的查找及处理

目前,低压剩余电流动作保护器已经在低压配网中被广泛使用,但是拒动故障的频繁发生严重影响了配网的运行安全性和稳定性。本文针对引起剩余电流动作保护器拒动故障的原因进行分析和查找,并提出了相应的处理方法,从而保证低压配网的安全和高效运行。     

GSM的数据远传技术的应用

在远程监控自动化系统中，采用常规有线及无线方式进行数据远传在很多方面有其局限性及不便性。为了高效经济的解决这些系统的数据远传的问题，而通过GSM移动通信业务实行数据远传。讨论了GSM的特点及其在远程监控自动化系统的数据远传中的应用。     

GSM—R场强数据的实时采集处理与远程监控研究

随着高速列车的不断提速以及网络应用的迅速普及,对GSM-R网络场强测试数据的实时采集处理速度和远程监控要求也逐步提高。在网络化的GSM—R场强监控系统中,利用DataSocket技术,设计了实时发布接收的网络拓扑结构和远程监控方案,并进行了编程实施;对场强数据的采集、发布、接收、处理与分析等环节进行了远程监控测试,实现了GSM—R场强数据的实时采集处理和远程监控功能,收到了较好的实际效果。     

广播发射台天线区调配室无线监测及防盗系统设计

为了实现对距离广播发射台较远的天线区设备进行远程监测和看护,本文利用多种无线传感器、GSM/GPRS网络、INTERNET网构建了天线区调配室的远程监测及防盗系统。该系统通过GSM短消息的方式向发射台值班人员发送报警信息,通过GPRS通信方式向发射台机房监控平台发送报警数据和执行远程监控。     

基于GSM短消息的通信电源监控系统的设计

随着GSM网络的发展,短消息作为GSM系统中最为简单和方便的数据通信方式,其业务和应用得到迅猛的发展。文章利用现有的GSM网络资源对通信电源进行实时、准确的监控。为通信电源的远程监控系统提供一种便捷的无线数据传输方式。     

MXT2003在智能安防家居系统的应用设计与实现

随着时代的发展,越来越多的人们使用信息电器,而根据国内的情况,设计一款高效率、低成本的远程控制智能安防家居系统是时代的需求,让更多的人舒适、便捷、安全的对家居电器等进行有效率的安全监控。本系统主控制器采用STM32模块,通信模块采用GSM移动模块,通过MXT2003模块采集模拟数据,实现远程监控。家庭安防嵌入式远程监控系统主要功能要求是能让主人随时知道家中的安防情况和远程监控家中电器设备的状态。     

利用GSM短消息实现远程监控

短消息是GSM(全球移动通信系统)中最简便的数据通信方式.随着短消息业务的日益完善,短消息已具备承载重要数据信息的能力.文中探讨了利用GSM短消息作为数据传输媒介实现远程监控的可行性,给出了采用西门子公司的TC35型GSM收发模块和AT89C51单片机构成远程监控通信单元的设计方案,并详细介绍了远程监控通信单元的硬件和软件设计.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.