基于分合闸线圈信号的断路器状态在线监测系统设计

针对目前高压断路器在线监测技术的研究现状和不足,提出了一种基于分合闸线圈电流信号的高压断路器状态在线监测系统。设计了构成系统的硬件电路和在线监测软件,该系统能够快速实现对实时数据的采集、转换、滤波、放大和分析,能够计算分合时间、分合速度、开关行程、分合行程、过冲距离等参数,能够对高压断路器的动作类型进行基本的判断,监测结果能在上位机监控界面上显示。实验和实际运行结果表明该系统具有实时性好、监测数据全面、可靠性高和抗干扰能力强等优点。     

网络多信道异常通信数据在线监测系统设计

为解决传统网络多信道异常通信数据在线监测系统反应灵敏度低,工作效率差等问题,设计了一种新的网络多信道异常通信数据在线监测系统。首先,系统硬件主要设计了数据提取模块、关联监测模块和流量监测模块,为系统创建奠定硬件基础;其次,通过设定在线监测依据、过滤不符合的监测标准、记录监测数据结果、记录数据辨别、获取数据端口等软件设计,实现了网络多信道异常通信数据在线监测系统的研究设计。实验结果表明,所提监测系统可以快速监测到异常通信数据,工作效率快,工作能力强。     

基于LoRa技术的矿井数据监测系统的设计与研究

为了解决传统矿井数据监测系统组网复杂、传输距离短和高功耗等问题,提出一种基于LoRa技术的矿井数据监测系统。该系统利用LoRa无线通信技术组建数据传输网络,包含监测节点和汇总节点。监测节点可以实现多点、多种环境数据的监测,汇总节点接收所有监测节点的数据,然后将数据打包处理后经GPRS模块上传至服务器。利用C#语言开发的上位机可以实现对监测数据的保存以及实时显示。经测试,该系统能够实时准确监测矿井环境数据,运行稳定可靠,可以满足矿井环境监测的需求。     

基于无线传感网络的矿井水质在线监测系统开发与试验

为解决目前矿井水源类型识别人工采样、劳动强度大,数据分析周期长等问题,本文构建了基于无线传感网络的矿井水质在线监测系统,该系统由传感器节点、协调器节点和地面监控主机构成。传感器节点采用Atmega128处理器实时采集矿井水温度、PH值和电导率信息,通过无线通信模块CC2530直接发送给协调器节点,协调器节点通过串口将数据上传给地面监控主机。节点软件以IAR为开发环境,采用单片机C语言开发实现数据处理和传输。监测软件以C#程序开发直观的实时数据监控平台。通过现场测试表明,系统运行稳定,可靠性高。     

基于组态软件的抑垢性能监测系统的设计

针对自行设计的实验台设计了抑垢性能在线监测系统,分析了监测系统要实现的功能,以工控机为中心,结合分布式远程采集模块和mcgs组态软件完成了系统的设计。详细介绍了系统的硬件组成和软件设计,最终实现电磁抑垢性能的实时在线监测,经过在实验台的应用,该系统运行稳定,效果良好,为水处理技术研究的持续进行提供了保障。     

水质在线监测系统质量保证与控制措施

文章在提高工作人员素质、建立水质在线监测系统管理制度、巡检及维护仪器设备、配备专用实验室等水质检测工作的基础上,以四水厂水质在线监测站为例,分析了水质在线监测系统的质量控制措施。     

真空断路器在线监测系统研究

真空断路器在中压(10-35k V)配电系统中有非常广泛的应用;真空断路器导致的各种故障对电力系统的安全运行具有重要影响,为了提高电力系统的稳定性、可靠性,降低运行维护费用,真空断路器的在线监测系统的研制和使用得到了电力运行和管理部门的高度重视。本文在分析中压真空断路器在线监测需求基础上,提出了一种通用的中压真空断路器在线监测系统设计框架,并详细介绍了实现断路器在线监测过程中需要解决的若干软、硬件设计过程中的关键技术问题。根据本文技术方案研制的在线监测系统在多个产品上已经成功应用,功能完善、性能良好、可靠性高。     

高压电缆绝缘在线监测与诊断系统分析

<正>在线系统用于监测高压电缆绝缘性能相关参数稳定性，拥有强大故障诊断功能。高压电缆绝缘故障会产生安全隐患，可能引发触电事故、火灾等，以往的绝缘检测工作以人工为主，成本高、效率低，在线监测、诊断系统的设计应用，以实时检测的方式，反馈数据信息，对故障进行预警，具有可靠性、稳定性、准确性等优势。本文对电缆的放线原理和信号监测原理进行分析，进行在线监测与诊断系统的设计应用，从整体结构、数据采集、数据传输、数据分析、软硬件配置等角度完成系统分析。     

基于联机分析处理技术的机电设备检修系统

信号处理是机械设备故障诊断中的关键技术,起着对监测信号进行加工、变换,从中提取敏感故障征兆的重要作用.针对当前机械设备维修信息处理和分析过程中存在的问题,分析了联机分析处理和数据挖掘技术的相关理论,提出基于联机分析处理和数据挖掘技术实现在线监测数据的星型数据系统模型.系统采用客户/服务器结构,实践证明该系统可根据实际需要高效地对机械设备维修信息进行在线分析、预测,为进一步全面实现机电设备在线监测起到有效支持.     

浅析无线电监测数据分析系统构建

0 前言 全国无线电管理机构经过十余年的努力，建成了一定规模的无线电监测网络，具备了固定站、车载站、搬移站、便携设备等相辅相成的监测网络。无线电监测网络的建立．对加强无线电频谱监测、加快无线电干扰源查找定位、打击非法设台、有效维护空中电波秩序发挥了巨大的作用。同时，各无线电监测网络系统在长期的运行中积累了大量的历史监测数据。     

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.     

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.     

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.     

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