单分散TiO2的性能研究

以钛酸四丁酯为原料，三乙醇胺为形态控制剂，采用简单的凝胶溶胶-水热法制备了单分散的纳米级二氧化钛（TiO2）粒子。采用X-Ray衍射仪（XRD）、透射电镜（TEM）等手段对粒子的结构与形貌进行了分析。并考察了合成的纳米TiO2子的电化学性能和光催化活性。     

Study on the reduction behavior of CoOOH during the storage of nickel/metal-hydride battery

The storage of nickel/metal-hydride (Ni-MH) battery with co-precipitated cobalt hydroxide and post-added cobalt compound as the additives for pasted Ni(OH)₂ electrode is studied in this paper by using galvanostatic charge–discharge, cyclic voltammetry and X-ray diffraction (XRD). It is shown that (I) capacity loss occurs only on the battery with post-added cobalt compound during the storage; (II) CoOOH derived from co-precipitated cobalt hydroxide has a better stability than the one from post-added cobalt compound and an irreversible reduction of the latter is observed; and (III) an inactive Co + 3O(OH) is obtained from Ni(OH)₂ electrode with post-added cobalt compound after the storage and should be responsible for the property deterioration of Ni-MH battery. Thus, it is important to increase the stability of CoOOH derived from post-added cobalt compound when Ni-MH battery suffers a long-term storage.     

基于负荷分类的台区线损测算方法

以低压供电台区线路损耗的计算为目的,对传统低压线损计算方法的误差及可行性进行了分析,在此基础上,提出了通过分类负荷曲线叠加确定电流方差,进而利用考核期内运行参数(实抄电量)确定线损指标的新方法,该方法针对低压供电台区用户的负荷特点,将其分为3种类型,实测3类用户的典型负荷曲线,利用3类用户的典型负荷曲线和售电量,合成低压配变出口待测月的负荷曲线,最后得到持续电流负荷曲线,进而计算电流方差。这样提高了等效功率法中电流方差的计算精度,使得该方法计算的台区线损比传统方法精度要高,基本满足台区线损指标要求。文中利用一台区的电量数据对所提方法进行了测试,并与传统方法的计算结果进行了比较,算例表明所提方法可行,具有较强的工程实用价值。     

基于RANSAC算法的基本矩阵估计的匹配方法

基本矩阵包含了摄像机的所有内参数和外参数信息,求解基本矩阵是计算机视觉中的重要研究课题。在介绍极线几何和基本矩阵理论后,提出了一种基于Sampson距离的RANSAC(Ran-dom Sampling Consensus)算法用于解决求解基本矩阵中误匹配问题。通过从图像的特征提取、特征点匹配到求解基本矩阵的完整的仿真实验,验证了该算法的有效性。     

发电机后轴承异常振动的诊断处理

针对几起发电机后轴承异常振动问题，在取得了大量现场试验数据的基础上，对异常振动机理进行了详细的分析，查明了异常振动的原因并提出了处理解决的途径。     

发电机微机保护装置误动原因分析及解决方案

通过对一起发电机微机保护动作后的相关现象进行分析,查出引起微机保护误动作的根本原因,并提出整改方案,弥补了设计存在的不足。     

桥式超导限流器与电力系统距离保护配合问题研究及算法改进

随着对超导限流技术研究的不断深入,与电网匹配运行的问题被提上日程.针对桥式超导限流器与继电保护的配合问题进行研究,从理论上分析了桥式超导故障限流器对距离保护的影响;同时结合微机保护的特点,提出了一种从微机保护的算法中剔除投入超导限流器后所带来的影响的新算法.并通过EMTDC/PSCAD仿真,验证了该算法的有效性,从实际应用的角度提出了一种解决超导限流器与微机距离保护相配合的新思路.     

基于工作流的电网检修计划管理系统研究

为实现电网检修计划管理业务流程的网络化、自动化,利用微软的工作流新技术Windows Workflow Foundation(WWF),提出了基于MS.NET平台的电网检修计划管理系统解决方案.利用Petri网对一个典型的电网检修计划业务流程建模并分析所建模型的正确性,给出了基于WWF模型驱动和面向组件实现所建电网检修计划工作流模型的可视化设计方法,能够较好地满足实际应用的需要,具有实现成本低、开发难度小,系统灵活性、可扩展性好等优点.     

基于开关磁阻电机的车用起动-发电-助力一体化系统研究

针对基于开关磁阻电机的车用起动-发电-助力一体化（ISAD）系统，分析其主要工况（起动，助力，发电）状态下控制策略并给出仿真波形。同时采用TMS320F240型数字信号处理器和EPM7128S型复杂可编程逻辑门阵列构成核心控制器。最后以1kW三相6／4开关磁阻电机为样机完成起动-助力-发电实验，给出了实验波形和分析结论。实验结果表明，该控制器及其控制策略是有效的，基于开关磁阻电机的车用ISAD系统在工程实践上是可行的。     

Thermal and dielectric properties of ZnO-B2O3-MO3glasses (M = W, Mo)

Glasses in the ZnO-B₂O₃-MO₃(M = W, Mo) ternary were examined as potential replacements to PbO-B₂O₃-SiO₂-ZnO glass frits with the low firing temperature (500–600^∘C) for the dielectric layer of a plasma display panels (PDPs). Glasses were melted in air at 950–1150^∘C in a narrow region of the ternary using standard reagent grade materials. The glasses were evaluated for glass transition temperature (T _g ), softening temperature (T _d ), the coefficient of thermal expansion (CTE), dielectric constant (ε _r ), and optical property. The glass transition temperature of the glasses varied between 470 and 560^∘C. The coefficient of thermal expansion and the dielectric constant of the glasses were in the range of 5–8 × 10^{− 6}/^∘C and 8–10, respectively. The addition of MO₃to ZnO-B₂O₃binary could induce the expansion of glass forming region, the reduction of T _g and the increase in the CTE and the dielectric constant of the glasses. Also, the effect of the addition of MO₃to ZnO-B₂O₃binary on the transmittance in the visible-light region (350–700 nm) was investigated.