电码化配套器材测试系统的研制与应用

阐述电码化配套器材对站内行车安全的重要性,并根据工厂生产的器材种类和现场实际电路的应用情况,确定电码化配套器材测试系统的设计原理,并对电码化配套器材测试系统的工作原理和应用进行介绍。     

Free Propagation of Wave in Viscoelastic Cables with Small Curvature

IntroductionDynamicbehaviorsofcablesandcable structureshaveattractedtheattentionofmanyresearchers .Therehavebeenmanyreports[1 5 ] ontheproblemsofnaturalfrequencies ,freevibrations,andstabilitybehaviorsofcablesandcablestructures .Manyavailabletechniques ,s…     

城市道路照明的设计与探讨

随着城市建设的发展，城市公共道路照明(以下简称路灯)工程是一个城市的重要窗口。如何节省运营管理费用，最大限度地发挥路灯的社会、经济效益，选择经济合理的供配电方式，灵活准确的控制管理模式，是目前路灯系统设计中的一个重点和难点。结合江～华公路华宁～温泉段的路灯设计工程，提出一些建议和值得注意的问题与同行探讨。     

汽车空调维护要点

汽车空调系统一般应注意以下维护要点：压缩机：压缩机的安装支架不得松动。传动皮带松紧度要适宜，过松会引起打滑，造成压缩机转速下降，制冷量不足；过紧又加剧皮带磨损以及造成曲轴轴承过早损伤。压缩机冷冻机油油面高度应在规定范围内，在正静情况下冷冻机油消耗量极少，如果从压缩机的视油镜片中看不到冷冻机油，则说明冷气系统中存在泄漏现象，应及时维修。     

Kinetic characteristic for a synchronal rotary compressor

The synchronal rotary compressor is si mple instructure,but it has stronger adaptability for a vari-ety of working medium,so it is a good type as aircompressor,oil pump andrefrigerationsystemcom-pressor.The geometric theory and structure charac-teristics of this mechanis m are introduced[1].Itgives the designing background for the synchronalrotary compressor.The calculational methods of arotary speed of cylinder and relative speed bet weenthe cylinder and bladed rotor are deduced in detail;the…     

基于TEMPEST的计算机电磁泄漏数据处理平台

针对计算机及其外设的电磁泄漏问题。分别在GTEM室和EMC室进行了相关测量．应用TDS7104数字示波器用多种采样率对被测设备的多种状态进行时域测量，获得了比较全面的时域测量数据．在此基础上构建了一个基于TEMPEST的计算机电磁泄漏数据处理平台，对测量得到的大量数据进行了处理和分析。提取了时域、频域的特征量。为信息窃取与反窃取的研究工作奠定了基础．     

装载机液压缸泄漏故障的诊断及维修

通过对ZL5 0装载机液压系统的分析 ,简要介绍了工程机械液压缸泄漏故障的诊断及维修方法     

计算机电磁信息泄漏文字再现

设计了针对计算机电磁信息泄漏的接收和再现系统.用宽带天线截获电磁信息泄漏信号后,经带通滤波和放大,再用锁相环电路捕获帧同步与行同步信号.同步信号经模数转换后,得到视频数字信号的输出.然后,用平均滤波法对数字视频信号降噪.最后,用匹配滤波器获得再现的文字.测试结果表明,用平均滤波的方法使同步信号的信噪比提高了18.7 dB,可在12 m范围内获取奔腾486主机及阴极射线管显示器泄漏的文字信息.     

发热电缆布设方式对桥面融冰化雪的影响分析

文章基于江苏徐州地区温度气候状况,利用ABAQUS建立以发热电缆为电加热介质的桥面温度场数值模型,研究了发热电缆融冰化雪工程中发热电缆布设方式对冬季桥面温度场的影响。结果表明:桥面的温度场分布和桥面升温时间受发热电缆的线功率、布设深度和布设间距影响较大;发热电缆周围温度梯度较大,增加发热电缆的线功率、减小布设深度和布设间距,可以加快桥面升温速度,从而提高融冰化雪效率。通过对融冰化雪效率、效果、经济性和施工便捷性的综合考虑,建议发热电缆布设的线功率采用28 W/m,布设深度为10 cm,布设间距为10 cm。     

Steady state analysis of towed marine cables

Efficient numerical schemes were presented for the steady state solutions of towed marine cables. For most of towed systems, the steady state problem can be resolved into two-point boundary-value problem, or initial value problem in some special cases where the initial values are available directly. A new technique was proposed and attempted to solve the two-point boundary-value problem rather than the conventional shooting method due to its algorithm complexity and low efficiency. First, the boundary conditions are transformed into a set of nonlinear governing equations about the initial values, then bisection method is employed to solve these nonlinear equations with the aid of 4th order Runge-Kutta method. In common sense, non-uniform (sheared) current is assumed, which varies in magnitude and direction with depth. The schemes are validated through the DE Zoysa's example, then several numerical examples are also presented to illustrate the numerical schemes.