基于有记忆的模拟退火算法的配电网电容器优化配置

给出一种求解组合优化问题的全局搜索算法——有记忆的模拟退火算法解决放射性配电网中电容器的优化配置问题。该算法获得全局最优解的几率大大高于单纯的模拟退火算法，且计算时间上几乎没有增加。通过一种较为精确的计算方法——阻抗矩阵法求解网损微增率，从而确定无功补偿的最优点。潮流计算采用前推回代法。应用于IEEE69和IEEE33母线系统获得了满意的结果。     

GIS绝缘子在冲击电压下沿面闪络的分析

利用计算和试验两种方法,对在SF_6气体中的绝缘子施加冲击电压下的电场及其引起的沿面闪络原因进行了剖析,指出在冲击电压作用下,增加屏蔽罩是减弱电极结构所引起的电场垂直分量的一条行之有效的途径;沿面闪络主要取决于电场分布的均匀度和绝缘子表面受周围环境导电微粒污染这两个基本因素;电极形状导致的局部场强增大,靠增加绝缘子沿面闪络距离不能明显提高沿面闪络电压。     

关于黄河淤背区水土流失问题的探讨

黄河淤背区的存在 ,对确保黄河防洪安全有着重要意义 ,但淤区的水土流失现状堪忧 .通过对淤区水土流失成因、机理以及如何合理开发治理的分析探讨 ,提出了防治淤区水土流失的措施 .在发挥其防治效益的同时 ,也应重视开发种植效益 ,以改善黄河淤背区的生态环境     

Perception of difficulties for the back related to asssembly work: general findings and impact of back health

The study objective was to describe the perceptions of airplane assemblers on job demand for the back and how back pain modulated these perceptions. One hundred and seventy-six workers answered two questionnaires concerning back pain and the perception of work related difficulties (work activities, work contexts, tools, work positions, efforts). Results show that positions and work contexts are perceived as greater sources of difficulty than efforts or dynamic activities. The duration of a given position is more important than its frequency. Back pain has a significant but complex impact on the perception of difficulty. Assemblers appear to integrate several factors when evaluating their difficulties as opposed to individual aspects, as it is often measured in ergonomic studies. The results have important implications for the measurement of ergonomic factors in the genesis of back pain and illustrates the potential for misclassification and biases in current epidemiologic studies.     

上海500kV电网雾闪事故分析

介绍了１９９６年１２月３０～３１日上海电网５００ｋＶ线路发生的４８次雾闪的情况，分析了发生的原因，提出了相应的对策。     

我校图书馆过期期刊的管理与利用

高校图书馆的任务是为教学科研服务,不仅包括一般图书和现刊的流通服务,而且包括过刊的再利用。我校过刊资源较丰富,但利用率很低。原因是多方面的,就图书馆本身而言,过刊管理,也未跟上。应通过优化馆藏,加强管理,进一步拓宽和完善服务内容等途径,来提高过刊的利用率,实现其价值。     

原岩应力的边界元位移反分析确定方法

围岩位移量在岩石地下工程中比较容易测得，利用数值计算方法通过反分析的手段可以由位移反算出原岩应力，并通过边界元法阐述了原岩应力位移反分析法的原理。     

Neural networks of data inhibiting long memory pattern

We experiment with three neural network models for forecasting to better understand the performance of neural networks for the case when the data exhibits a long memory pattern. To obtain the optimum networks, the effect of network characteristics such as the training parameters, the number of hidden layers, and the testing and training percentages are simulated. The third model, which consists of a combination of individual time series forecasts, provides superior results.     

架空线路污闪问题分析

随着社会的进步和经济的迅猛发展,环境污染造成的危害日趋突出。电力架空线路分布广,长期处于露天运行的情况,不可避免地经常会受到周围环境和大自然变化的影响,从而在运行中引发污闪事故,如2001年初北方地区发生的大面积污闪。为防止线路发生污闪事故,保证线路的安全运行。本文就线路污闪的产生机理及应采取的治理措施谈及了自己的观点。     

电力设备防污闪复合纳米RTV涂料的研制

将纳米技术应用于RTV防污闪材料中,研制出RTV纳米复合绝缘材料。试验表明,所研制的SW-I型RTV纳米防污闪材料保持了RTV涂料原有的良好绝缘性、憎水性和憎水迁移性,在抗电老化、大气老化性能、机械强度、自洁性等方面均比普通RTV涂料大大提高,且可以显著提高绝缘子的耐污闪能力,是电力系统防污闪的理想材料。