农村配电网自动化技术的应用

配网自动化指的是通过应用各类高性能配电设备和配电技术,提升配电网络的化水平,提高系统运行效率和运行质量,对于配电网中的事故问题进行监控和维护管理.本文首先对农村配电网以及配电网自动化进行了介绍,然后对农村配电网自动化技术的应用进行了详细探究.     

电能计量自动化系统运行监控管理技术研究

我国经济发展速度不断加快,对电力能源的需求也在不断上涨。电能计量自动化系统运行监控管理技术应用,可以有效提升电能计量自动化系统管理水平,对保证电能计量自动化系统安全、稳定运行有着积极影响。相关人员还需要不断的加强研究力度,将电能计量自动化系统运行监控管理技术与配电网运行管理更为良好融合,为促进我国配电网建设发展奠定良好基础。     

关于配网自动化主站系统现状与展望

配电网是电力系统的重要组成部分,其自动化实现程度的高低直接影响到配电的可靠性与质量问题。配电网自动化是提高供电可靠性和供电质量、扩大供电能力、实现配电网高效经济运行的重要手段,也是实现智能电网的重要基础之一。配电网自动化主站系统是配电网自动化系统的核心部分,主要实现配电网数据采集与监控等基本功能以及配电网拓扑分析应用等扩展功能,并具有与其他应用信息系统进行信息交互的功能,为配电网调度指挥和生产管理提供技术支撑。本文主要介绍了配电网自动化主站系统的建设模式,阐述了配电网主站系统的现状,重点分析了配电网主站系统的发展趋势,希望对配电网的相关工作人员有所帮助。     

关于配网自动化主站系统现状与展望

配电网是电力系统的重要组成部分,其自动化实现程度的高低直接影响到配电的可靠性与质量问题。配电网自动化是提高供电可靠性和供电质量、扩大供电能力、实现配电网高效经济运行的重要手段,也是实现智能电网的重要基础之一。配电网自动化主站系统是配电网自动化系统的核心部分,主要实现配电网数据采集与监控等基本功能以及配电网拓扑分析应用等扩展功能,并具有与其他应用信息系统进行信息交互的功能,为配电网调度指挥和生产管理提供技术支撑。本文主要介绍了配电网自动化主站系统的建设模式,阐述了配电网主站系统的现状,重点分析了配电网主站系统的发展趋势,希望对配电网的相关工作人员有所帮助。     

配电网自动化系统中的运维技术分析

阐述配电网自动化技术的发展现状、运维过程中的故障，探讨配电网自动化技术在质量管理、安全管理中的应用，提出配电网自动化技术在系统运维中的应对措施。     

解析配电网运行管理中电力自动化系统技术的应用

在配电网运行管理中,应用电力自动化系统技术,可以有效提升配电网运行管理的水平,确保配电网的安全稳定运行。文章结合电力自动化系统技术的特点,对其在配电网运行管理中的应用情况进行了分析和探讨。     

县级供电企业配电网自动化通信技术的选择

配电自动化技术是服务于城乡配电网建设的重要技术,而通信技术是配电自动化的关键。传统配电网的保护及结构,包括管理运行方式都不适应现代电力市场需要。自动化通信技术在如今的电力市场中对提高电网运行及经济效益有着重大的意义。因此,本文通过对县级供电企业配电网自动化通信难点及其问题分析,为优化及更好的选择县级供电企业配电网自动化通信技术进行了探索。     

基于GPRS/CDMA技术的油田配电网络系统

油田配电网络自动化系统主要针对油田供电面积大、配电网络线路长、用电负荷重等因素致使配电网运行维护极其不便进行自动化监测与监控.提出基于GPRS/CDMA技术设计的油田配电自动化系统,可以实现油田配电网络优化运行与先进管理.     

基于GPRS通信网络的配变远程监控系统的设计

伴随电力系统信息化、自动化的越来越普及与完善,配电网也逐步实现了信息化与自动化,而配电变压器中的运行数据作为配电网正常运行的基础数据,实时监测与管理配电变压器的运行参数十分重要,为此构建配变远程监控系统利于实时监测配电变压器的运行状况。在此,本文将基于GPRS通信网络对配变远程监控系统设计进行探讨。     

通信技术在自动化系统中的监控功能探究

随着科技发展,自动化系统在各行各业中应用广泛,在配电自动化系统中的应用,一定程度上提高了电力单位的运营管理效率,促进了电力单位的快速、稳步发展,尤其基于通信技术的监控功能,更是将自动化系统的优势发挥到极致,因此,注重通信技术在配电自动化系统监控功能的探究,尤为重要.本文对配电网自动化系统中监控功能内容进行分析,探讨监控功能的设计与实现,以供参考.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks