基于EMS的智能备自投在线压板最优投退策略

备自投装置是保障电力系统供电可靠性的重要设备,备自投装置对其动作后是否会引起设备过载不能从全网的角度进行分析及预判,所以无法保证备自投动作后电网的可靠性。本文根据地区电网的特点提出备自投在线压板最优投退策略,通过遥控压板来对备自投装置进行闭锁或投入,该策略考虑了变压器油温及初始负载率及设备N-1校核,同时考虑了备自投的时序性及均分性等特点。现场运行情况表明本文提出的方法是可行的,可以最大限度地投入备自投并保证电网的供电可靠性。     

500kV输电线路传递绳牵引器的研制

500 kV输电线路检修作业中,传递绳为基本工器具,常规情况下与滑车组合使用,由高空人员将滑车固定在作业点后将传递绳安装至滑车上。针对传递绳垂放过程中通常出现的打结、缠绕等问题,研制了一种传递绳牵引器,减少高空人员到达故障点的时间,提高检修作业的效率。     

Microstructure of isotactic polypropylene obtained using Ziegler–Natta catalyst at high polymerization temperature

The microstructure of the isotactic polypropylene obtained with various MgCl₂‐supported catalyst systems at high polymerization temperature of 70–100°C is investigated by discussing the intrinsic relation between the different types of active centers and the polymerization temperatures via gel permeation chromatography, temperature rising elution fractionation, and ¹³C NMR. For the MgCl₂/TiCl₄/di‐n‐butyl phathalate‐AlEt₃/external donor and MgCl₂/TiCl₄/2,2‐diisobutyl‐1,3‐dimethoxypropane‐AlEt₃ catalyst systems, the differences in the isotactic productivity of polymers obtained at different polymerization temperatures mainly result from the variation of both the activity of the different isospecific active centers and the stability constants of the complex of catalyst/donor. The reaction rate of high isotactic active centers reaches maximum at 85–90°C, and this effect contributes to both the highest isotacticity and the narrowest molecular weight distribution. For the MgCl₂/TiCl₄/phthalate ester‐AlEt₃ catalyst system, the isotacticity of polypropylene remains approximately constant in the temperature range of experiments, which could be ascribed to elution of phthalate ester after the activation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42487.     

全国煤炭矿业权分布规律研究

基于全国矿业权实地核查成果数据库,确认煤炭矿业权在我国所有矿业权中占绝对优势的地位。在此基础上,从矿业权性质、地域分布、矿山开采规模、开采方式、矿业权获取方式等方面系统统计分析了煤炭矿业权分布特点和规律;归纳分析了煤炭矿业权分布所反映的主要问题,提出下一步加强煤炭矿业权管理的建议。     

基于ZigBee技术的温室大棚环境监控系统应用探究

本文的主要针对基于ZigBee的温室大棚环境监控硬件系统需求,构建无线传感器网络的节点端、中间件和客户端,使用Lab VIEW平台开发监控系统客户端界面,在Mote Works中开发一些自组网技术的节点端,负责对传感器采集的到的一些数据进行存储转发,而中间件是由Xserve去实现并对组建的模拟系统进行测试。