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。     

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.     

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。     

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。     

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.     

英国的非公开权益资本和风险投资

英国是欧洲风险投资和非公开权益资本的发源地。在欧洲国家中,英国的风险投资和非公开权益资本起步最早,发展也最快。从1979年算起,英国风险资本投资额和非公开权益资本增长了100多倍。2005年,在欧洲的风险投资市场上,英国的风险资本总额占欧洲风险投资额的40￣50%,在欧洲是当仁不让的“大哥大”,在世界范围内仅次于美国。本篇文章主要介绍了风险投资(VentureCapital,VC)及非公开权益资本(PrivateEquity,PE)的最新概念和从属关系以及英国的风险投资及非公开权益资本的历史、结构、规模、投资趋势、投资阶段、投资领域、地理特征、知名风险企业、投资表现等,以此从数据和分析的角度使中国的风险投资领域及非公开权益资本领域的从业人员以借鉴、启迪的作用。     

建设工程项目管理(PM)模式探讨

随着项目规模的扩大和投资主体的多元化，业主对建设项目管理提出综合性、系统性和全生命期集成管理的更高要求。我国政府投资项目推行代建制也要求相匹配的项目管理模式。根据在工程管理教学和实践中体会，探讨建设工程项目管理（PM）模式的特点和优势，提出应用PM模式的几点建议。     

Non-coercive influence: Scale development and validation based on resource and relational paradigms

To overcome competition in an increasingly network dependent market, retailers are required to influence upstream channel partners while sustaining relationships. However, the contemporary supply chain literature has not sufficiently leveraged the resource and relational paradigms to examine influence. Grounded on resource dependency theory and commitment-trust theory paradigms, this study describes conceptualization and operationalization of a 12-item scale for measuring non-coercive influence on upstream channel partners in retail supply chain management (R-SCM) context. The study is based on responses from 547 retail professionals in India obtained over four successive surveys. Psychometric properties were assessed using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). The proposed scale demonstrates construct validity. Invariance-testing carried out over 4-levels of increasingly demanding equivalence confirmed cross-validation. Nomological validity of the scale was tested by evaluating association with suppliers’ intention to cooperate. The results indicate existence of three dimensions of non-coercive influence: collaborative intent, market intelligence dissemination, and operational support. Retailers can use the scale to assess their personnel's non-coercive influence behavior over suppliers.     

企业竞争力的一种评价方法

讨论了企业竞争力的一种模糊评价方法,归纳了影响竞争力评价的因素。给出了一种应用于企业竞争力评价的指标体系和模糊评价方法,运用主成分分析法确定各指标的权重,为企业竞争力评价提供了一种定量分析方法。     

SCI收录河北科技大学学术论文的统计分析(2003-2007年)

SCI是衡量一个机构学术水平和科研能力的重要因素,尤其能反映自然科学基础研究的学术水平。笔者以美国ISI公司的Web of Knowledge网络数据库为依据,对2003-2007年间以河北科技大学为著者署名单位被SCI收录及引用的科技论文进行了统计分析,最后提出了增加中国科技论文被收录数和被引用率的一些建议。