Development of a novel solid phase extraction method for the analysis of bacterial quinones in activated sludge with a higher reliability

A novel analytical method for analysis of microbial quinones in activated sludge sample was developed with improved reliability compared to the conventional method. The operating conditions for the extraction of quinones from activated sludge sample with a methanol-chloroform mixture and hexane were optimized. A solid phase extraction method using the Sep-Pak Plus Silica, a small column packed with silica gel, was employed for the purification and separation of quinones instead of column chromatography and thin layer column chromatography used in the conventional method. The analytical operation was simplified and the analytical time was shortened by a half or two-thirds of that required for the conventional method. The recoveries of quinones were markedly increased from 30-60% with the conventional method to as high as 90-101% with the improved method, demonstrating that the reliability of the analytical results of the improved method is significantly higher than that of the conventional method. The quinone content value obtained using the improved method was twice as high as that obtained using the conventional method for the same activated sludge sample, but the quinone profiles expressed as the mole fraction of each quinone type were the same for each method.     

双材料 V 形切口应力强度因子计算及其在重力坝中的应用

本文用复势理论导出双材料Ｖ形切口的特征方程及切口顶端附近的应力和位移场，首次利用数值分析方法计算出了混凝土坝坝踵区的应力强度因子．典型算例表明，本文计算结果具有较高的计算精度．     

顺直型与宽窄型复式河道水沙分布规律的比较

本文在总结水槽试验资料的基础上．对顺直型及宽窄相间型复式河道的过流能力、流速及含沙量分布特性进行了比较分析。研究结果表明，两种复式河道的水沙分布具有一定的相似性，但也存在着较大的差别，并对其产生的原困进行了初步探讨。此外，通过比较滩槽流速比及滩槽流量比可以知道．宽窄复式河道的滩槽动量交换较顺直复式河道强烈。     

隔河岩重力拱坝拱座深层处理平面有限元分析

清江隔河岩重力拱坝坝基地质条件复杂，软弱夹层，断裂构造多，岩溶发育，两岸拱座存在局部滑动问题。     

白水峪水电站工程施工导流与度汛

白水峪水电站施工期间，曾遇到１９９５年４月２１日与１０月１９日水淹一期基坑的超标准洪水，１９９６年１１月１６日枯水期过坝洪水及１９９７年百年未遇的干旱，在公司、设计、监理协作下，顺利进行了导流与度汛，使主体工程施工未拖延工程进度，赢得各方肯定。     

大朝山水电站设计管理

设计管理（监理）是大型水电站工程建设管理中的一个重要内容，但目前仅仅处于探索阶段。通过大朝山水电站工程设计管理工作的实践，对设计管理的重要性、主要内容、管理方式及设计管理的发展作了进一步探索。大朝山水电站由于加强了设计管理，进行设计优化，取得了较大的经济效益。     

大朝山水电站工程截流概况

大朝山水电站工程是澜沧江上继漫湾之后的第二座大型水电部工程，１９９７年１１月１０日安全圆满实现大江截流。本文就工程截流的总体实施情况做一简要回顾     

射流泵内不可压流动N—S耦合方程有限元分析

应用Ｇａｌｅｒｋｉｎ有限元和Ｂａｌｄｗｉｎ－Ｌｏｍａｘ湍流模型，求解射流泵内不可压粘性流动Ｎ－５耦合方程，得到了射流泵内部流动参数分布，给出两个计算实例，计算结果与滓测资料基本吻俣，从而为射流泵内部流场的数值模拟研究提供了一种新方法。     

硅化物阻挡层对高压漏扩展MOS晶体管的影响

Silicide-block-film effects on drain-extended MOS （DEMOS） transistors were comparatively investigated, by means of different film stack stoichiometric SiO2 and silicon-rich oxide （SRO）. The electrical properties of the as-deposited films were evaluated by extracting source/drain series resistance. It was found that the block film plays a role like a field plate, which has significant influence on the electric field beneath. Similar to hot-carrier- injection （HCI） induced degradation for devices, the block film initially charged in fabrication process also strongly affects the device characteristics and limits the safe operating area.     

基于可编程控制器的工业用电子加速器控制系统

全面介绍了一个基于可编程控制器的工业用电子加速器控制系统．它的计算机控制系统采用西门子公司生产的SIMATIC-S7300系列的可编程控制器（PLC）作为核心设备,先进的硬件技术和优化的软件设计使整个系统的可靠性、可扩充性和可维护性都大大地加强。