试验数据分析前的基本处理

结合实际试验数据,对数字修约规则、极限数值的表示方法和判定方法等标准进行了概括。并介绍了常用的几种异常试验数据的舍弃规则,以及对合格判定中曾发生的意见分歧进行了实例分析,以供初涉及者参考。     

S1240程控交换机DSN的话务理论技术

随着我国通信技术的快速发展,程控交换机越来越普及,本文就我国应用较大的S1240程控交换机数字开关网络(DSN)的有关话务技术进行了一些研究。     

分布式拉曼放大器在长距离传输系统中的应用

讨论了分布式拉曼放大器在长距离传输系统中的应用,介绍了它的大动态范围特性、掉波特性、级联特性和应用于不同的传输光纤时的测量结果。     

GPS RTK技术在图根控制测量中的应用研究

载波相平差分（RTK）技术是一种高效快捷的定位技术，是实时处理两个测站载波相位观测差分方法。介绍了GPS PTK技术作业模式、数据键的传输性，工作环境及其在运城经济技术开发区地形图根点加密中的应用，分析了GPS RTK技术特点，主要误差来源及减少误差的方法，提出GPS RTK在工作中应注意的几个问题，GPS RTK技术的应用将使测绘企业获得更大的经济社会效益。     

高层住宅的含钢量控制

通过对某高层住宅设计过程的介绍,包括方案阶段与建筑的配合,施工图阶段的结构选型,计算分析及构造,通过对比,提出影响含钢量的几个因素,对以后的工程有一定的参考价值。     

X 波段雷达接收机中低噪声放大器的研究

现代雷达系统结构对接收机的性能提出了更高的要求.低噪声放大器能降低系统的噪声和提高接收机灵敏度,是接收系统的重要组成部分.本文设计的低噪声放大器应用于接收机的前端,利用集成芯片 ATF36163完成了电路的设计并且通过研究 RF 电路中的参数灵敏度对该低噪声放大器进行了灵敏度分析.结果表明:经过参数灵敏度分析的低噪声放大器不仅符合接收机对 LNA 的指标要求,还能使性能更加稳定     

Enhanced magnetic-field-induced optical properties of nanostructured magnetic fluids by doping nematic liquid crystals

ABSTRACT: A kind of ferronematic materials composed of 4-cyano-4'-pentylbiphenyl nematic liquid crystal and oil-based Fe3O4 magnetic fluid was prepared by using ultrasonic agitation. The birefringence and figure of merit of optical properties of pure magnetic fluids and the as-prepared ferronematic materials were examined and compared. The figure of merit of optical properties weighs the birefringence and extinction of the materials and is more appropriate to evaluate their optical properties. Similar magnetic-field- and magnetic-particle-concentration-dependent properties of birefringence and figure of merit of optical properties were obtained for the pure magnetic fluids and the ferronematic materials. For the ferronematic materials, the values of Q increase with the volume fractions of nematic liquid crystal under certain fixed field strength and are larger than those of their corresponding pure magnetic fluids at high field region. In addition, the enhancement of Q value increases monotonously with the magnetic field and becomes remarkable when the applied magnetic field is beyond 50 mT. The maximum relative enhanced value of QR exceeds 6.8% in our experiments. The results of this work may conduce to extend the pragmatic applications of nanostructured magnetic fluids in optical field.     

基于任务分解的通用变电站操作票系统

本文结合作者在某地区开发的操作票专家系统，介绍了一个可通用地生成变电站操作票的应用系统。该系统通过把变电站操作任务分解为顺序执行的子任务。使得系统可以通过案例学习实现对于不同接线形式变电站操作票开列的智能处理。在操作票的开列中利用黑板结构进行规则推理，以生成操作语句。本系统对不同接线形式变电站操作票的自动生成具有通用性。     

Enhancement of high temperature thermoelectric properties of intermetallic compounds based on a Skutterudite IrSb3 and a half-Heusler TiNiSb

Phonon glass and electron crystal (PGEC) thermoelectric materials have been expected to be a new class of thermoelectric materials for high temperature applications. Among the efforts to optimize the high temperature thermoelectric properties of various PGEC thermoelectric materials, recent experimental works on the Skutterudite IrSb₃ and half-Heusler TiNiSb intermetallic compounds are presented herein by which the material design concept for high energy conversion efficiency, i.e. a high figure of merit, is suggested. It is revealed that the thermoelectric efficiency of IrSb₃ can be increased by the decrease of lattice thermal conductivity due to the rattling effect of La atoms filled in the structural vacancies of the Skutterudite crystal structure. In the half-Heusler TiNiSn, high temperature thermoelectric properties are improved by Hf substitution to the Ti sites by reducing lattice thermal conductivity and also by Sb doping to increase power factor. It is concluded that the proper alloy designing for controlling crystal structure and carrier concentration could enable these intermetallic compounds to exhibit a high potential for elevated temperature thermoelectric applications.