高校学生的自留风险与投保偏低原因探析

高校对学生平安保险是自留风险还是投保保险，应慎重选择，自留风险与投保学生各有利有弊，但投保偏低不利地学生完成学业，投保偏低的原因是值得探讨的问题。     

Pre-assessment on the loss and impact caused by large-scale flood disasters

Through intensive studies, we have established an index system for evaluating the loss and impact caused by large-scale flood disasters, and constructed a methodological system for pre-assessing the loss and impact caused by large-scale flood disasters. Through numerical simulation, submerged characteristics of large-scale flood can be determined. According to the characteristics of spatial corresponding distribution between land-use types and types of disaster-affecting subjects, we have realized spatialization for social and economic statistic data, and have completed spatialization evaluation on the loss and social impact caused by large-scale flood disasters using the spatial analytical function of GIS software. It is possible that large-scale flood can occur in the lower Yellow River. Flood management requires pre-assessment on the loss and impact caused by flood disasters. Nevertheless, there is no appropriate pre-assessment method for the lower Yellow River at present. By imitating the flood happened in Yuanyang, the north bank of the lower reach of Yellow River in 1958, we did pre-assessment on the loss and social impact caused by the overflow flood. We found that this method can be used to predict the types, quantity and spatial distribution of economic loss caused by large-scale flood disasters. This method can determine population affected by disasters and degree and spatial distribution of disasters. Indirect loss can be predicted as well using this method.In general this method can meet theneeds of regions affected by flood for planning and making decisions in fighting floods and reducing loss.     

微带和鳍线导体损耗的全波分析

在微带和鳍线的直线法分析理论的基础上，提出了一种计算由金属屏蔽和导体条带表面阻抗引起的导体损耗的方法。导出了计算公式。比较了用本方法算得的和实际测得的微带导体损耗，还比较了用本方法和谱域法算得的鳍线导体损耗。结果的良好一致性证明了这一方法的有效性。     

晶闸管通态电流额定中LZR参数的确定

本文从晶闸管器件的平均功耗角度出发,找出了一重要参数LZR,即与各种电流波形相对应的稳态热阻,并给出了确定该参数的计算机程序。使得工程技术人员只要知道晶闸管器件的平均功耗,便可确定相应的元件结温升及电流额定值,具有很高的实用价值。这对于元件结温测试及任意电流波形下元件全面积与非全面积开通时通态电流额定,具有重要意义。     

基于同类信源共虚通道的CAC方案

提出了同类信源共虚通道的传输方案，根据实际的信元丢失率，设计了一种简单而有效的呼叫允许控制方案．在该呼叫允许控制方案中，由网络自身来估计信源的部分参数，从而减少了对用户所提供的参数的依赖     

考虑到处理机性能的TMR系统可靠性分析

本文用Ｍａｒｋｏｖ更新过程理论和排队论理论，对三部件的优美劣化系统进行了讨论求出了此系统的可靠性指标和性能指标。并把此系统与单机系统进行了比较，得出了重要结论。     

一种简单实用的机械损耗和铁损耗的分离方法

考虑到按《国标1032-68》的方法分离中小型异步电动机机械损耗和铁耗时，对条件较差的电机修理厂和实验室会产生诸多不便，该文提出了一种简便、实用、准确度较高的分离机械损耗和铁耗的方法，为分析电动机的工作性能提供了较大的方便．     

QUADRATIC ADMISSIBLE ESTIMATE OF COVARIANCE IN PSEUDO-ELLIPTICAL CONTOURED DISTRIBUTION

This article mainly discusses the admissibility of quadratic estimate of covariance in pseudo-elliptical distribution.Under the quadratic loss function,the necessary and sufficient conditions thata quadratic estimator is an admissible estimator of covariance in the class of quadratic estimators areobtained.A complete class of the quadratic estimator class is also given.     

加强线损管理 实现企业利润最大化

随着现阶段电力需求的增大,电量损失越来越大,文中从管理上、技术上论述了如何加强线损管理,以降低供电成本,提高经济效益。