Assignment of Weights to the Member States of the European Union in Order to Model Their Relative Power Positions

Relative power of the member states of the European Union is expressed by weights assigned to the states on the basis of five criteria: population, gross domestic product, national area, political stability, and contributions to the European culture and civilization. The underlying idea is that ratios of these weights should approximate ratios of the five corresponding indicators. In addition, relative power can be moderated when the large member states save their power for issues about which they care more, and it can be amplified when the large states coordinate their efforts in order to dominate a coalition of smaller states. The results of the analysis are used to sketch a power distribution in the enlarged European Union.     

基于K—H—V—S组合机构直线传动器的研究

将行星减速机构、偏心转换机构与螺旋机构依次串接,形成了一种K—H—V—S组合机构,并在各个运动副中,采用钢球或者钢柱间接传动,实现了运动副之间的滚动摩擦．基于此机构,开发出一种新型直线传动器．在此主要讨论了K—H-V—S机构的设计方法．     

地质雷达在埋置物截面形状和尺寸正演分析中的应用

地下埋置物的存在会对基础设施和建（构）筑物的施工建设和安全运行产生不利影响,准确地把握埋置物的定位、截面形状和尺寸等信息尤为重要。以重庆市三个典型的桥涵为例,总结归纳覆盖层物质、埋置物截面形状变化条件下的地质雷达图像的响应特征。同时,提出了一种通过图像衍射曲线的顶点坐标以及水平方向反射图像的变化为依据,确定截面范围的方法。为了验证所提出方法的有效性,将通过图像确定的数据与现场测量的数据进行了对比分析。结果表明,对于规则性的图形结果的吻合度较高。不规则的四边形具有一定的误差,不过,误差值仅有2mm。所提出的方法具有简便、快捷、准确度较高等特点,有利于实际工程的应用。     

滚压修复抽油杆的质量控制

介绍了抽油杆滚压修复的原理和修复工艺流程,进而提出了依据行业标准SY/T 5029《抽油杆》控制各个修复环节质量的具体要求。在对抽油杆使用要求和各个工艺环节分析的基础上,分别提出了对抽油杆的几何尺寸、表面质量、螺纹质量和机械性能的控制办法和控制参数。对于几何尺寸,应当控制压下量;对于表面质量,应当对镦粗部位修磨;对于螺纹质量,应当清洗、修复和检测;对于机械性能,应当调整好设备参数。     

On the Use of the Log CAR Measure in Event Studies

Cross-sectional averages of log returns have been used to measure shareholder wealth effects in several event studies. No adequate explanation of the implied portfolio strategy has ever been provided in the literature. We argue that the method is biased or does not portray a realistic portfolio strategy. It should therefore be used with caution in the event-study' literature.     

Pricing Options With Curved Boundaries1

This paper provides a general valuation method for the European options whose payoff is restricted by curved boundaries contractually set on the underlying asset price process when it follows the geometric Brownian motion. Our result is based on the generalization of the Levy formula on the Brownian motion by T. W. Anderson in sequential analysis. We give the explicit probability formula that the geometric Brownian motion reaches in an interval at the maturity date without hitting either the lower or the upper curved boundaries. Although the general pricing formulae for options with boundaries are expressed as infinite series in the general case, our numerical study suggests that the convergence of the series is rapid. Our results include the formulae for options with a lower boundary by Merton (1973), for path-dependent options by Goldman, Sossin, and Gatto (1979), and for some corporate securities as special cases.     

GPS大地高观测值替代几何水准可行性探讨

GPS是随着现代科学的发展而兴起的以卫星为基础的无线电导航定位技术。它具有定位精度高、操作简便等优点,在测量领域获得了越来越广泛的应用。GPS在高程控制测量方面的应用还存在着不尽如人意的地方,主要的原因是GPS高程控制测量只能得到大地高,而不是工程中所需要的正常高。实现大地高向正常高的转换是工程上应用GPS高程控制成果所必须要解决的问题,也是本文研究的主要内容。     

On mixing,compounding, and tail properties of a class of claim number distributions

The mathematical structure underlying a class of discrete claim count distributions is examined in detail. In particular, the mixed Poisson nature of the class is shown to hold fairly generally. Using some ideas involving complete monotonicity, a discussion is provided on the structure of other class members which are well suited for use in aggregate claims analysis. The ideas are then extended to the analysis of the corresponding discrete tail probabilities, which arise in a variety of contexts including the analysis of the stop-loss premium.