浅谈变电设备巡检系统技术的探讨

随着电力系统的发展,对发、输、供和用电的可靠性和经济性要求越来越高,同时,随着变电站智能化巡视管理、在线监测、模式识别、计算机信息处理技术等的发展,变电站电气设备从现行的计划检修向状态检修缺陷预测转变,已成为必然趋势。计划检修是对电力一次设备以预防性试验为基础的计划检修制度。     

电力通信网全程管控系统建设思路

电力通信网是电力系统的重要基础设施,主要作用是保证电力系统安全稳定运行,提供通信资源的有序化,规范化管理。对通信设备及通信业务进行集中化,智能化监控,对通信运雏工作进行闭环化,流程化管理,形成智能化,综合化．自动化的电力通信网智能全程管控网络,是提高工作效率,保障通信设备安全运行的有效手段。本文以电信管理网（TMN）为基础体系,探讨电力通信网智能全程管控的设计思路,提出了适应电力通信冈的网管系统体系结构。     

铁路通信大数据应用建设思考

铁路通信大数据的应用,实现了专业管理无纸化、设备检修电子化,解决了作业关键环节卡控问题,节省人力、节约成本。通过实际运用,提出了大数据应用建设的3个关键环节:基础数据采集录入、数据审核治理、动态数据共享分析。铁路通信大数据将依托既有数据资源优势,统筹分析,应用大数据这一新理念、新技术,助力提升专业管理。     

信息通信设备状态检修技术的试点研究与应用

近年来,随着电网高速发展,各种信息通信设备大量投产,相应检修工作量也大幅增加。设备检修是设备管理工作重要组成部分,对提高设备健康水平,保证设备安全、可靠运行有重要意义。状态检修则是先进的设备检修管理机制,是社会生产力的发展在检修领域具体体现。本文对信息通信设备状态检修技术研究工具与依据进行分析,并探讨在电力信息通信设备状态检修中的实际应用,供参考。     

基于状态检修的电厂设备优化检修策略研究

随着＂厂网分开、竞价上网＂的电力市场制度的实施,发电企业需要在保证设备运行可靠前提下,降低设备的维修成本,从而增强企业的竞争力.因此过去采用的电厂计划检修、故障检修等方式将会逐步被优化检修方式取代.优化检修是一种以设备为中心,对设备检修、使用、维护为一体的方式,从而最终形成一套包含定期检修、状态检修、改进性检修和故障检修的优化检修模式.     

基于Access的无人机通信系统管理软件的研发

针对无人机通信系统维修管理复杂的特点,利用数据库管理系统Access2003设计了无人机通信系统管理软件,实现了设备管理的信息化,可以方便、快捷地实现设备数据的录入、查询、分析、统计和归档,有效解决装备使用、维修、管理中的诸多问题。     

电力变压器电气高压试验的技术要点探究

在电力系统中,电力变压器是核心组成设备之一,电力变压器能否稳定运行,对电网供电效果产生了直接影响。在实际工作中,影响电力变压器质量安全的因素有多种,例如:制造水平不高,导致电力变压器本身存在质量隐患;运行环境恶劣,导致电力变压器内部线路、元件容易发生故障等。为了确保电力变压器的可靠使用,要求开展电气高压试验,以判定电力变压器是否正常,或是哪些部位存在质量问题,为检修工作提供参考。     

连铸设备综合判断计算机专家系统

通过对现场数据采集系统硬件、软件和通信方式的研究,从原计算机监视系统中顺利读取现场电气设备的实时信息·设计、编制了连铸过程中电气设备的故障判断和预报系统、数据库管理系统·研究了主机辊系状态的神经网络判断模型,建立的专家系统诊断出了连铸主机辊系设备运行中的故障,避免了铸坯质量问题的出现·比原系统增加了数据库、设备智能化管理和模型计算等功能,经过半年的现场考核该系统取得了良好效果·     

输电线路地理信息系统数据库的研究与设计

分析了输电线路运行检修与管理所涉及到的线路、杆塔、设备以及日常管理工作中的数据与信息流,提出了以GIS(地理信息系统)软件和数据库软件分别管理输电线路数据的方法,构建了输电线路地理信息系统数据库的框架.输电线路的空间(图形)数据采用GIS软件进行管理,非空间(属性)数据采用关系数据库管理,两者通过集成地图开发的方式进行关联.数据库设计时,定义了设备之间的连接关系与从属关系,例如输电线路与杆塔、杆塔与塔头等,可依据这些关系对设备和输电网络进行追踪.整个系统数据库基于C/S(客户机/服务器)结构,实现网络共享和系统安全性功能.     

变电站高压电气设备状态检修策略分析

变电站安全运行,才能为社会生产提供充足的动力保证。变电站高压电气设备状态检修是电力发展过程中设备检修方式的必然选择,通过电气设备运行的状态确定是否进行检修以及优化工作,变电站高压电气设备的状态进行检修对变电站的安全运行和安全供电具有重要意义。主要分析了变电站高压电气设备状态检修的内涵,即在线监测、故障诊断和状态维修,提出了实现变电站高压电气设备状态检修的策略。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with