天生桥一级水电站发电机内部故障的计算和分析

由于定子绕组为整数槽分布，出现只有一匝的匝间短路，此故障的分析计算表明，各种主 保护方案均将拒动，文中特别注意发电机不完全纵差保护中性点侧电流互感器接入方式问 题，结论是多分支大型水轮发电机的不完全纵差保护，不能每相中性点侧仅接入一个分支的 电流互感器。     

发电机和大型异步电动机纵差保护的几个问题

发电机纵差保护的整定计算中，不适当地垮大了不平衡电流，混淆了制动系数Ｋ和制动特性斜率ｍ，结果造成定值过大，影响了机内短路的灵敏度。大型异步电动机自启动过程中，由于纵差保护两侧互感器暂态特性不一致，自启动暂态过程较长，使纵差保护多次误动，急待采取技术措施解决。     

大型发电机定子中性点接地方式研究的一种新途径

本文使用一个分布参数模型，利用ＰＳＰＩＣＥ进行大型发电机定子中性点接地方式的仿真研究，对暂态波形进行分析得出了结论，将所得结果与ＴＮＡ实验、电路理论，多回路理论所得结果进行比较，验证了该模型的正确性。     

基于周期统计平均的结构动力复合反演研究

研究了输入未确知条件下的参数识别、荷载反演问题。根据激励的周期特性，运用统计平均的思想，构造出一类时域识别反演算法。数值算例表明，该算法的参数识别精度高，且具有很强的噪声适应能力和初参数选择鲁捧性。将本算法与全量补偿算法有机会结合，可更好地解决在旋转动力设备周期激振力作用下的结构参数识别及荷载反演问题。     

应变模态在框架结构节点损伤诊断中的应用研究

通过对某7层钢制框架结构节点损伤的数值模拟和模型试验，利用应变模态在结构损伤前后的相对变化进行框架结构节点损伤的诊断。结果表明，一阶应变振型对损伤及其位置敏感，高阶应变振型节点的存在使得依据高阶应变模态进行损伤诊断时容易造成误判。因此，利用一阶应变振型在损伤前后的相对变化可以对框架结构节点的损伤进行诊断。     

Two-dimensional PtRu Nanoclusters Carbon Based Electrocatalysts for Methanol Oxidation

A novel method to prepare an electrocatalyst with a new structure and high catalytic performance was reported. Two-dimensional (2D) PtRu nanoclusters have been successfully deposited on graphene oxide and carbon black supports. Compared with the commercial 3D E-TEK PtRu samples, the prepared 2D PtRu composites have larger electrochemically active surface area and display much higher catalytic activity toward methanol oxidation reaction. The preparation method mainly includes the following procedures: oxidation of carbon matrix, Pb²⁺ adsorption on the surface of carbon support, Pb²⁺ electrochemical reduction and galvanic displacement of Pb⁰ by Pt²⁺ and Ru³⁺. The method developed in this study could be viable for solving the problem of low electrocatalytic activity in direct methanol fuel cell anodes.     

Durable superoleophobic fabric surfaces with counterintuitive superwettability for polar solvents

Smart superoleophobic (SOP) cotton fabric surfaces are created only through a controlled fluorosilanization treatment, exhibiting the first‐ever extreme wetting behaviors displaying ultrarepellency to nonpolar oils and counterintuitive superwettability for all polar solvents. The smart durable SOP surfaces, demonstrated chemically, thermally, and mechanically, render great potential practical and industrial applications in robust oil shielding, effective antifouling, highly energy efficient self‐cleaning, and solely gravity‐driven oil–water separations. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2752–2756, 2014     

Preparation,cure kinetics,and thermal properties of novel acetylene terminated silazanes

A new kind of acetylene terminated silazanes, N‐(3‐acetylenephenyl)‐diorganosilazanes (abbreviated as APSZs) with three kind of substituents, were synthesized by the aminolysis of dichlorosilane with 3‐aminophenylacetylene (3‐APA). Structure of APSZs was confirmed by Fourier transform infrared spectroscopy (FT‐IR) and nuclear magnetic resonance (NMR). Thermal behavior of the cured silazanes was determined by thermogravimetry analysis (TGA), revealing that cured silazanes exhibited high temperature resistance. The ceramic yields of APSZ‐Me₂, APSZ‐MeVi, and APSZ‐Ph₂ at 1000°C under nitrogen were 77.6, 81.9, and 68.7%, respectively. The peak separation of derivative thermogravimetric data was employed to evaluate the three major regions of the thermolysis, and the kinetic parameters of thermolysis were calculated by the method of Kissinger from dynamic thermogravimetric measurement in nitrogen atmosphere at several different heating rates. Influence of substituents on the thermal behavior of cured silazanes in each separated region was discussed. The results showed that the vinyl derivative exhibit higher thermal stability than methyl and phenyl derivatives due to the high decomposition activation energy and small pendant group. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

狭长地块上的建筑空间利用--以建屋9号地块配套商业为例

盘活边角地带、狭长地块，既考虑与地块内部主要功能区域的合理结合，又与周边城市空间做到自然接入，注重空间的整合与合理运用。     

移动机器人同步定位与建图技术综述

同步定位与建图技术(SLAM)一直是移动机器人领域比较热门的研究方向,它可以给机器人提供强大的环境感知能力;传统的依靠外部位置参考来定位的方法如果无法获得时,移动机器人需要即时定位自身位置来构建增量式地图,因此SLAM技术也就应运而生;对激光SLAM和视觉SLAM的研究现状及最新标志性成果进行了介绍,重点对以相机与激光雷达融合、相机与IMU融合、激光雷达与IMU融合为代表的多传感器融合SLAM技术展开讨论、系统地梳理了几种融合方式的优势与不足,同时介绍了该领域的研究热点语义SLAM,最后讨论了SLAM技术在该领域未来的发展方向以及存在的挑战。