浅谈低压配电系统的选择

我国低压配电系统常见的有IT、TT、TN-C、TN-S、TN-C-S几类系统。当电气设备因绝缘损坏而发生漏电或击穿时,平时不带电的金属外壳及与之相连接的其他金属部分便带有电压。人体触及这些意外的带电部分时,就可能发生触电事故。减少或避免这类触电事故的技术措施有保护接地、保护接零、装设漏电保护器等。     

物流运输企业货运车辆超载问题的有效约束机制研究

为了有效治理物流运输企业货运车辆超载的问题,运用决策论的研究方法,根据公平理论及决策理论的期望效用最大化原理,推出了超载问题有效约束机制的充分必要条件、惩罚强度和查处概率,通过对货运车辆超载行为的分析,对货运车辆超载问题的约束机制进行设计,并提出治理物流运输企业货运车辆超载的管理者最优策略.     

Derivatives use and financial instrument disclosure in the extractives industry

This article documents the use and disclosure of derivatives in the Australian extractives industry. We find that derivatives are used by 23 per cent of our sample, with mitigation of commodity risk and foreign exchange risk being the most common purposes for which derivatives are used. The most common types of derivatives used in the sector for hedging purposes are forward rate agreements and options. Results indicate that derivative use is positively associated with financial risk and firm size. We also examine the relation between firm characteristics and the extent of financial instrument disclosure, using a disclosure index based on the additional requirements in IFRS 7 Financial Instruments: Disclosures. Empirical results reveal that large firms with higher leverage, which use derivatives, and are audited by a Big 4 auditor provide more extensive disclosure of financial instruments.     

An empirical study of outbound tourism demand in the UK

A general to specific methodology is used to construct UK demand for outbound tourism models to twelve destinations. A tourism destination preference index is introduced to take into account social, cultural and psychological influences on tourists' decisions concerning their overseas holiday destinations. The tests support the existence of a cointegration relationship for each of 11 UK overseas holiday destinations. The corresponding error correction models are estimated. The empirical results show that the long-run income elasticities for all destinations range from 1.70 to 3.90 with an average of 2.367. The lowest and highest short-run income elasticities are 1.05 and 3.78 respectively, with an average of 2.216. The estimates of the income elasticities imply that overseas holidays are highly income elastic while the own-price elasticities suggest that the demand for UK outbound tourism is relatively own-price inelastic. In terms of the significance of substitution prices in the regression equations, Ireland is the favourite substitute destination for UK outbound tourists. Ex post forecasts over a period of six years are generated from the ECM models and the results compared with those of a naive model, an AR(1) model, an ARMA(p,q) model, and a VAR model. The forecasting performance criteria show that the ECM model has the best overall forecasting performance for UK outbound tourism.     

对产业集群客户授信风险管理的思考

贷款客户集中度是衡量贷款风险的一项重要指标。特别是2008年世界金融危机发生后,各国都在防范金融风险上加强控制,随着巴塞尔协议3逐步广泛得到世界各国的认同和实施,贷款集中度问题越来越应该引起重视。但是,由于事实上的微观动作,贷款集中有趋重的趋势,其中产业集群客户授信是重要手段。本文结合授信风险管理存在的问题提出建议。     

索赔特征对保险理赔(诉讼)额影响的实证分析——基于交强险人身伤害判决数据

面对日益增多的保险理赔(诉讼),亟需加强索赔原因及索赔特征对法院判决结果的影响研究.本文通过对北京市大兴区人民法院2007年1月至2010年8月涉及人身伤害的交强险判决案例进行回归分析,发现:索赔原因与索赔人损失大小、就业状况、法律规定的赔偿上限有关;索赔人在交通事故中承担的过错责任与其性别、医疗费支出状况、是否死亡有...     

浅谈静压管桩的辅助沉管及后压浆施工

随着高层建筑的迅猛发展和桩基础形式不断推陈出新,静压管桩以其特有的优势得到广泛应用。但由于地质情况的复杂多变,静压预制管桩施工工艺也需要不断改进。即对静压管桩的辅助沉管及后压浆施工技术进行简要探讨。     

WinCE下的GPIO驱动程序开发

基于ARM+WinCE架构下的嵌入式开发在很多领域已得到广泛应用,而在此架构下的设备驱动程序开发对一般用户来说是一个难点。为了总结出简洁、实用和具有参考意义的在ARM+WinCE架构下的GPIO驱动程序开发过程,深入研究了WinCE下流驱动的基本原理、梳理出了WinCE下GPIO驱动程序的开发方法和完整流程。最后编写了一个驱动LED灯的示例性驱动程序,以供开发者参考。     

关于水电施工企业文明施工策划的思考

本文围绕水电施工企业文明施工策划的意义、策划的依据、策划的组织领导、策划的出发点、策划的内容四个层面展开论述,以引起管理者在水电工程施工过程中切实做到文明施工,从而降低事故发生概率,提高安全生产管理水平,满足环境保护的要求,提升企业外部形象。     

计算机网络安全防范策略

随着互联网技术在社会的各个领域的广泛应用,网络环境下计算机泄密问题也越来越严重,计算机网络的安全问题已变得非常严峻。因此,能否保证计算机网络系统的安全和正常运行便成为网络管理所面临的一个重要的问题。