三相异步电动机断相保护器

详述了断相保护器的电路结构与工作原理。当电容C2上的电压上升到BT33C的峰点电压时,小灵敏继电器KA通电,切断电动机的电源,从而避免了三相异步电动机单相运行致使电流过大而被烧毁。为了使小灵敏继电器KA通电充分,能确保其常闭触点断开,及时切断电动机的电源,应使BT33C的电流不会很快降到谷点电流以下,电容C2上的电压能较长时间的大于BT33C的谷点电压。由于电容C2上的电压不能跃变,这样可避免电网三相电压瞬间不平衡造成断相器误动作。     

Strategic Internet application trends in supply chain management

The Internet is evolving as a powerful force in the new marketplace where the nexus of competition has changed from individual firms to efficient supply chain networks both between firms and within industries. This study explores Internet adoption patterns and operational applications in US supply chain networks. The data reveal that the integration of the Internet into supply chain management applications has increased and has moved away from indiscriminate application of novel Internet technologies towards becoming a focused endeavor with precise expectations and measurable goals. Specifically, the study finds that Internet usage within supply chains is maturing as evidenced by enhanced and increased productivity, reduced costs and increased profit for participating firms.     

Option pricing in the presence of natural boundaries and a quadratic diffusion term

This paper uses a probabilistic change-of-numeraire technique to compute closed-form prices of European options to exchange one asset against another when the relative price of the underlying assets follows a diffusion process with natural boundaries and a quadratic diffusion coefficient. The paper shows in particular how to interpret the option price formula in terms of exercise probabilities which are calculated under the martingale measures associated with two specific numeraire portfolios. An application to the pricing of bond options and certain interest rate derivatives illustrates the main results.     

跨国公司对我国汽车合资企业控制分析

跨国汽车公司以国际直接投资(FDI)方式建立合资企业是我国汽车产业利用外资的主要形式.在实际运行中,股权比例的安排并不等于实际控制权的分配,合资企业对合资双方相关资源依赖性的强弱决定了合资双方的实际控制权.跨国汽车公司借助技术垄断优势,通过双方合资时的约定或日后实际运作中的设计安排,以非股权约束的方式来实现对合资企业的实际控制.     

内部评级法在国内商业银行实施的本土化研究

内部评级法的实施需要建立在一定的前提基础之上,中国目前的实施条件还存在一定的缺陷,因此如何在内部评级体系的构建过程中体现本土化的原则将成为有效实施的关键。中国特有的金融生态决定了地区之间的金融风险差异较大,因此在具体实施过程中,应将地区金融风险差异作为调整系数对内部评级法的评级结果进行调整。中国的商业银行尚处于内部评级法实施的准备或开始阶段,受实施条件和金融生态的限制,本土化将是一个长期的、渐进的创新过程。本土化并不仅仅是内部评级法相关标准的本地化应用,同时也要求在这一过程中有创造性地发挥内部评级法对银行风险管理的积极作用。     

个人理财市场细分及客户群差异性分析

目前我国商业银行个人理财业务尚处于初级阶段,个人理财市场的细分还很简单,尚没有进行更深入的、多层次的分析。针对这一情况,本文借鉴“家庭生命周期”的分析思路,选取人口统计变量和家庭生命周期变量等综合指标作为客户细分变量,对给定的调查样本实施市场细分。为此,本文利用方差分析探讨了一般客户、重要客户、未来潜力客户和战略客户4组客户理财个性的差异性以及对银行理财服务质量期望的差异性。同时,还分析这组客户对主要理财工具、理财产品的需求特点,并在市场细分的基础上制定出4差异化的、有针对性的营销策略。     

中国商业银行曼奎斯特生产率指数分析

本文用非参数的DEA产出前沿面构造出曼奎斯特(Malmquist)生产率指数模型,DEA产出Malmquist可分解为效率变化指数和技术变化指数。并应用该模型时中国14家商业银行1998-2002年的生产率进行了分析,得出中国商业银行生产率在考察期内是提高的,但技术进步对生产率提高的作用要大于代表管理水平的效率变化指数对生产率提高的作用。同时也得出,生产率的提高与所有制结构有直接关系。     

从国际经济学理论视角看企业竞争优势——兼议国际经济学优势思想的演进

本文通过回顾和分析国际经济学中国际贸易理论和国际直接投资理论优势思想的发展和]进,说明了理论研究可以通过对各种市场结构的细分,把优势分析引入到企业内部,并通过对分工、市场结构与交易费用之间的矛盾关系的深入研究,探讨内生优势与外生优势之间的对立统一关系,而企业竞争优势的培育则是一个建立在企业自身独特能力基础上的、综合利用企业内外部各种比较优势的动态累积发展过程。     

构筑品牌战略 提升我国中小型企业的核心竞争力

中小型企业是国民经济的重要组成部分,对经济发展和社会稳定起着举足轻重的促进作用。中小企业的核心竞争力是企业发展的根本保证。构筑中小企业品牌战略,对强化我国中小企业核心竞争力、扩大市场份额、保持竞争优势具有重大的现实意义。     

The impact of tax holidays on earnings management: An empirical study of corporate reporting behavior in a developing-economy framework

This study investigates whether foreign investment enterprises (FIEs) in China alter their corporate reporting behavior in response to a known schedule of tax-rate increases. The context of this investigation is a tax-incentive scheme that allows firms to pay taxes at a reduced rate for a limited period of time, and then at a higher rate when this period expires. If managers attempt to maximize firm value by minimizing tax costs, then the spread of tax rates in the periods surrounding the rate change may provide a substantial incentive for them to accelerate revenue and defer expenses. Consistent with this hypothesis, the empirical results indicate that firms report significantly higher discretionary current accruals for the years before tax-rate increases. The evidence, which indicates that firms manage earnings upward to take advantage of lower tax rates that are available in certain years, has important implications for tax policymakers.