浅谈民用建筑电力系统的接地设计

在建筑强电和弱电系统内,接地无疑是保护系统的重要组成部分,尤其是采用屏蔽系统的综合布线系统,接地不良直接影响系统的稳定性。本文分析了电力系统中性点的接地方式,论述了民用建筑接地设计的方法以及应注意的问题。     

500kV自耦变压器中性点小电抗接地在广东电网的应用研究

广东电网500kV主网中自耦变压器的大量应用,使得系统零序阻抗迅速减小,导致单相短路电流超过三相短路电流,甚至超过了断路器遮断电流。针对部分站点三相短路电流较小、单相短路电流超标的特殊情况,本文提出在广东电网相关站点采用500kV自耦变压器中性点小电抗接地的方式,以降低单相接地短路电流水平,从而避免使用分母的方式限制短路电流。以广东电网典型500kV站点为算例,分析和计算该方法对短路电流的限制效果,并进一步对中性点电抗器的小电抗取值、主变中性点的过电压保护和绝缘配合问题进行了探讨。     

一种基于BP神经网络的B2C电子商务顾客满意度评价模型

针对当前电子商务顾客满意度评价方法所存在的不足，提出一种基于BP神经网络的评价模型。首先，建立了B2C模式下电子商务企业顾客满意度评价指标体系，然后根据指标体系，设计了BP神经网络模型，并利用神经网络工具箱对模型进行了实现，通过学习样本的训练，使模型的误差达到预定的范围内．验证结果表明，BP神经网络方法对B2C模式下电子商务企业顾客满意度评价有着良好的效果。     

交叉外汇远期合约的定价及应用

目前,我国市场上推出的金融衍生工具很少,没有可用来对冲系统风险的金融工具,因此,2001年后资本市场的衰落导致券商和基金发生大面积亏损.设想,如果政策允许,可以使用一种以外国股票或股指作为标的而以本币进行计价的金融衍生工具(交叉外汇远期合约、期货和期权)对冲系统风险,即利用外国股市与我国股市的相关性对投资组合进行套期保值.这里我们将介绍如何使用该方法对交叉外汇金融衍生工具的一种交叉外汇远期合约进行定价,推导套期保值的原理并介绍用其对冲系统风险的操作方法.     

Long-term industrial equilibrium in an ITQ managed fishery

This paper discusses long-term equilibrium in a fishery managed by individual transferable quotas. Rising prices or falling capital costs become capitalized in a higher value of quotas, implying higher capital costs for holding quotas. This may in fact reduce the size of each firm and lead to more firms existing in long-term equilibrium. Resource rent taxation by letting firms lose a certain share of their quota holdings each year is discussed and shown to be neutral.     

10kV供电系统接地方式分析

结合A企业10kV电力系统的问题，对系统接地方式及设备改造进行比较分析，选择与系统相适应的中性点接地方式及其相关设备，并对应用情况进行了分析。     

Ritual legitimation, de-coupling and the budgetary process: managing organizational hypocrisies in a multinational company

The study of participation in the budgetary cycle has formed a prominent part of the research literature concerned with the budgetary process. More recently there has emerged a body of literature concerned with exploring the political and symbolic nature of the budgetary process. The paper reports upon the outcomes of an empirical study of the introduction of `budgetary participation' in a division of a European subsidiary of a large North American car manufacturer. We detail the long process of consultation and negotiation within the subsidiary, and between it and the European Headquarters. The study provides a revealing instance of the roles of formal budget participation as a ritual of control and legitimation without the substantive involvement of middle managers and suggested to us the introduction of de-coupling and organizational hypocrisy alongside the introduction of budget participation. The study pays close attention to the contingent effects of the wider political context of the division and the relationships between the division, its organizational context and organizational environment, and how this context played upon the budgetary process in the division. The outcomes that we analyse at `Delta' reflect the de-coupling strategies and organizational hypocrisies commonly found in public sector organizations. In this wider setting the corporation persists with the ritual of `tight' budget negotiation and target setting and apparent underachievement in performance. Yet we conclude that the complex technological and political context to the formation and siting of Delta continued and may continue to support its existence.$g0     

浅谈电力系统中的接地和接零

随着当代科学技术的迅速发展,各种电器、电子设备全面进入社会生活各个领域,成为社会文明进步的重要标志。在我国,人民生活水平不断提高,对家用电器的需求量越来越大。各类电器、电子设备在全国城乡和到迅速普及,给生产带来极大方便。但各类电器、电子设备的广泛使用,由此带来的人身事故也大为增加。在电力系统中,为避免事故的发生,通常采取保护接地和保护接零的防范措施。下面就谈谈有关保护接地和保护接零的问题。