Goodness-of-fit tests for a heavy tailed distribution

We study the Kolmogorov–Smirnov test, Berk–Jones test, score test and their integrated versions in the context of testing the goodness-of-fit of a heavy tailed distribution function. A comparison of these tests is conducted via Bahadur efficiency and simulations.     

Cr13白口铸铁获得屈氏体的研究

铸态屈氏体高铬铸铁用于水泥磨球已经问世。本文对 Cr13白口铸铁如何得到屈氏体基体组织进行了试验研究。在 Cr 含量一定时,随着 Cr/C 减小,砂型浇注时,过冷奥氏体铸态转变为屈氏体量逐渐增加,金属型浇注时则不易转变。当 Cr/C≤4时,砂型和金属型试样铸态均能得到全部的屈氏体基体。金属型开型后铸件置于550℃炉内保温一定时间随炉冷却,高的 Cr/C 材质亦能得到屈氏体基体组织,但增加了生产工序。加入微量铝可使含碳量在2.6～3.0%的中碳材质砂型和金属型铸件铸态得到屈氏体基体,并有较好的综合性能。     

皮尔士的逻辑人生

皮尔士早年曾受严格的逻辑训练,坚持以逻辑学为学术目标,一生热情地追求逻辑学的改进和应用。他的逻辑思想具有广阔的视野,对于逻辑学的发展作出了杰出贡献。然而,他作为一位伟大逻辑学家,长期不被人理解,只是在近几年才重新得到发现和重视。     

进出口商如何应对UCP600

UCP600相对于UCP500,在内容上作了大量实质性的修改。进出口商掌握信用证业务操作中的最新变化,对进一步促进我国贸易的发展有着重大的意义。在对UCP500和UCP600不同点分析的基础上,对进口商和出口商在信用证的运作的具体过程中的每一个环节应如何应对UCP600的变化提出了相应的建议。     

标准谬误论的批评和重新解读

诸多学者追随汉布林，对标准谬误论进行了广泛而持久的批评。这些批评无疑大大促进了谬误研究。但是，不仅这些批评存在矫枉过正的情况，而且也存在从新的视界重新解读标准谬误论的可能性。     

On the distribution of quadratic functionals of the ordinary and fractional Brownian motions

In this paper we discuss some distributional properties of quadratic functionals of the ordinary and fractional Brownian motions (fBms). As far as the ordinary Brownian motion (Bm) is concerned, those properties have been established extensively. A transition from the Bm to the fBm is not straightforward. Some difficulties associated with dealing with the fBm are explained, and a way to solving the problem is indicated, and some conjectures are given.     

Bayesian mixture modeling for spatial Poisson process intensities,with applications to extreme value analysis

We propose a method for the analysis of a spatial point pattern, which is assumed to arise as a set of observations from a spatial nonhomogeneous Poisson process. The spatial point pattern is observed in a bounded region, which, for most applications, is taken to be a rectangle in the space where the process is defined. The method is based on modeling a density function, defined on this bounded region, that is directly related with the intensity function of the Poisson process. We develop a flexible nonparametric mixture model for this density using a bivariate Beta distribution for the mixture kernel and a Dirichlet process prior for the mixing distribution. Using posterior simulation methods, we obtain full inference for the intensity function and any other functional of the process that might be of interest. We discuss applications to problems where inference for clustering in the spatial point pattern is of interest. Moreover, we consider applications of the methodology to extreme value analysis problems. We illustrate the modeling approach with three previously published data sets. Two of the data sets are from forestry and consist of locations of trees. The third data set consists of extremes from the Dow Jones index over a period of 1303 days.     

高校辅导员专职化的发展历程与现实思考

设立学生辅导员是我国高等教育的特色和优良传统。伴随着新中国高等教育的发展,辅导员的专职化也经历了创立、发展、挫折、恢复、稳定、再发展的过程;在50多年的发展过程中,岗位设置规范与任职条件及其待遇的提高是两大显著变化;未来的辅导员队伍,朝着科学化、职业化及专业化的方向发展是历史的必然。如何适应社会需求,完善辅导员制度,职业化和专业化、管理体制与运行机制等问题需要进一步思考。     

当前淘宝网C2C交易市场的运营措施分析

我国的C2C电子商务交易市场已进入寡头垄断时期,呈现出"三强纷争、淘宝独大"的局面.淘宝网作为当前我国C2C交易市场的龙头老大,其市场运营措施的实施将引领和决定这个市场的未来发展方向,对此加以分析意义深刻.     

特殊情况下出口企业的风险防范问题

外贸出口企业在一些特殊情况下防范履约风险的措施是 :首先 ,应在合同中订立不可抗力条款以防范风险的发生 ;其次 ,还应投保卖方利益险和出口信用险以弥补因买方拒付、拒收给出口企业造成的损失。另外 ,出口企业在与外商签约时尽力争取对己有利的CIF贸易术语成交和信用证结算方式支付 ,以此把风险损失降到最低程度。