三主桁连续钢桁拱桥整体节点有限元分析

东平水道桥是武广高速铁路上一座四线铁路桁架拱桥,主跨结构为99m+242m+99m的三主桁连续钢桁拱,主桁采用整体节点形式,三主桁内力分析表明中桁处受力最大。节点板联结着主桁、腹杆、横梁、平联等各类杆件,结构及受力均较复杂,节点应力分布是设计中的关键问题之一。文章利用有限元程序对其特殊位置节点板进行应力分析,研究了其应力分布及传力特性,为设计提供依据和给同类桥梁提供参考。研究表明通过调整节点构造和板件刚度,节点具有足够的受力与传力功能。     

以知识联盟塑核心能力——论我国内资旅行社的市场竞争战略

随着我国旅行社行业的不断开放，小、散、弱、差的内资旅行社必须紧紧把握世界范围内的服务产业知识化的浪潮，塑造自己的核心能力，改造成为知识服务实体，方能在今后的竞争中生存和获胜。旅行社要获得持续的竞争优势，在满足顾客需求成为企业生命线的今天，必须具备的两个能力是满足顾客需求和发挥员工的积极性和智慧。旅行社的核心能力可以而且必须通过知识联盟来实现。     

Property Regimes as Information Regimes: Efficiency and Economies of Joint Production

The paper argues that it is useful to view property regimes asinformation regimes. A conceptual model and numerical example are usedto show that, under some reasonable assumptions, a common propertyregime is preferable to a private property regime when property regimesare viewed as information regimes. The paper considers a case ofidiosyncratic risk in a dynamic grazing context where the marginality ofthe resource is such that insurance markets are thin or non-existent.Agents are thought to be risk averse and exogenous enforcement of a risksharing scheme is not feasible. The policy implication is that theestablishment and maintenance of a common property regime is shown to bea (possibly) reasonable institutional response in the face of difficultand particular circumstances when property regimes are viewed asinformation regimes.     

SERIES EXPANSION OF THE SABR JOINT DENSITY

Under the SABR stochastic volatility model, pricing and hedging contracts that are sensitive to forward smile risk (e.g., forward starting options, barrier options) require the joint transition density. In this paper, we address this problem by providing closed‐form representations, asymptotically, of the joint transition density. Specifically, we construct an expansion of the joint density through a hierarchy of parabolic equations after applying total volatility‐of‐volatility scaling and a near‐Gaussian coordinate transformation. We then establish an existence result to characterize the truncation error and provide explicit joint density formulas for the first three orders. Our approach inherits the same spirit of a small total volatility‐of‐volatility assumption as in the original SABR analysis. Our results for the joint transition density serve as a basis for managing forward smile risk. Through numerical experiments, we illustrate the accuracy of our expansion in terms of joint density, marginal density, probability mass, and implied volatilities for European call options.     

试论外部评级与内部评级的协同发展

外部评级和内部评级协同发展可以实现优势互补,加强信用风险管理。虽然我国内外部评级体系已经初步建立,但由于缺乏科学的协同发展机制,二者并没有实现有效的结合。为充分利用现有资源,发挥各自优势,我们应创造良好的法律和市场环境,加强监管部门之间的协作,建立信用数据共享机制和评级结果校验互补机制,通过银行与外部评级机构的密切合作,共同促进外部评级与内部评级的协同发展。     

汽车零部件联合采购运作模式研究

文章在分析传统汽车零部件采购和零部件联合采购的基础上,构建了汽车零部件联合采购模型,探索性的提出三种汽车零部件采购联盟的运作模式:委托代理式汽车零部件采购联盟、合资式汽车零部件采购联盟、第三方运营的汽车零部件采购联盟。并对每种模式进行了详细的分析,同时提出采购联盟组建过程中需要注意的问题,为汽车零部件联合采购提供了理论基础。     

路企直通运输联合调度模式研究

路局调度所是直通运输方案实施者，是路企直通运输这一新的组织模式效率和效益的源头。为促进直通运输步入有序化、正常化、规范化，需要加强联合调度模式研究，创新信息整合、流程再造、作业组织、联劳协作、调度指挥等，确保直通运输组织稳中求进，顺利实施。     

论特别窝藏犯的民事责任

1998年《最高人民法院关于执行〈中华人民共和国刑事诉讼法〉若干问题的解释》规定,在特殊情况下窝藏犯承担有限连带责任。但是,要求特别窝藏犯承担连带责任的正当性并不充分。补充责任不仅能充分保护被害人的合法权利,也明确了附带民事诉讼被告为终局责任人,有利于保护特别窝藏犯的正当利益。因此,特别窝赃犯承担补充责任较妥当。     

Risk Preferences,Production Risk and Firm Heterogeneity*

A new technique is proposed for deriving the risk preference function under production risk and expected utility of profit maximization. The derivation depends on neither a specific parametric form of the utility function nor any distribution of the error term representing production risk. The proposed risk preference function is flexible enough to test different types of risk behavior and symmetry of the output distribution. Furthermore, our production risk specification allows for inputs with positive and negative marginal risk. The econometric model accommodates production risk, risk preferences and firm heterogeneity simultaneously. Norwegian salmon farming data are used as an application.     

我国企业对外直接投资方式之比较分析

我国企业对外直接投资有购并与新建、合资与独资等四种方式;它们各有利弊、互有长短。