Tail Probability Ratios of Normal and Student’s t Distributions

The ratio of normal tail probabilities and the ratio of Student’s t tail probabilities have gained an increased attention in statistics and related areas. However, they are not well studied in the literature. In this paper, we systematically study the functional behaviors of these two ratios. Meanwhile, we explore their difference as well as their relationship. It is surprising that the two ratios behave very different to each other. Finally, we conclude the paper by conducting some lower and upper bounds for the two ratios.     

What causes more mistrust: profile owners deleting user-generated content or website contributors masking their identities?

People regularly rely on user-generated contributions to websites to inform their opinions about people, companies, organizations, and products. This study examines how two website affordances uniquely affect the evaluation of user-generated content. Specifically, an experiment was conducted that varied whether a website (a) affords profile owners the ability to delete user-generated contributions or (b) verifies the identity of users who post evaluations of profile owners. The results suggest that although deleting user-generated content is viewed as more problematic, both forms of information control independently affect how viewers evaluate a website and the content it hosts. The findings help establish the conditions under which certain forms of information control differentially produce uncertainty and mistrust and thus have direct implications for warranting theory.     

Trade liberalization and decentralization of state-owned enterprises: Evidence from China

This paper examines the relationship between trade liberalization and the probability of state-owned enterprises (SOEs) being decentralized. We find that tariff cuts for inputs significantly lower the probability of a SOE being decentralized, whereas tariff cuts for outputs raise this probability. We also find that as the distance from a SOE to its overseeing government increases, the effects of input and output tariff cuts on the probability of SOEs decentralization become stronger. Our empirical results are consistent with a simple model in which local governments try to balance the costs of supervising SOEs against the profits extracted from SOEs.     

多源图像数据的冬小麦面积测量方法研究——基于固定拍摄角拍摄照片的地物重投影坐标模型

本文以光学成像原理为基础,通过实测、三维模拟测量的方式取得成像参数,证明了成像照片中地物的固定比例特性,以此构建坐标矩阵模型实现标准化测量;通过对照片测量点建立1000m缓冲区与冬小麦遥感测量结果进行回归分析,1000m格网的遥感测量结果为当年统计调查结果的99.5％.本文构建的模型,解决了手机拍摄取得照片的标准化测量问题,拓宽了农作物面积测量野外数据获取方式,提升了农作物遥感应用能力.     

论战时比例性原则的适用：要素、标准与价值评判

参照国际公约的相关规定,首先就战时比例性原则的概念与内涵进行了探讨,附带损害和军事利益是该原则的两大构成要素,适用战时比例性原则的标准可分为理性指挥官标准、演算法标准、个案分析法标准、累积法标准、＂针对性杀戮案＂中的三条件标准与军事必要性标准等,对于该原则的适用需要结合有关理论和实践,最后通过对相关条款加以阐释的方式,就比例性原则的适用问题进行综合性的价值评判,以求更好地适应于未来实践的具体需要。     

The analysis of mixed interval-censored and complete data

The article focuses mainly on a conditional imputation algorithm of quantile-filling to analyze a new kind of censored data, mixed interval-censored and complete data related to interval-censored sample. With the algorithm, the imputed failure times, which are the conditional quantiles, are obtained within the censoring intervals in which some exact failure times are. The algorithm is viable and feasible for the parameter estimation with general distributions, for instance, a case of Weibull distribution that has a moment estimation of closed form by log-transformation. Furthermore, interval-censored sample is a special case of the new censored sample, and the conditional imputation algorithm can also be used to deal with the failure data of interval censored. By comparing the interval-censored data and the new censored data, using the imputation algorithm, in the view of the bias of estimation, we find that the performance of new censored data is better than that of interval censored.     

空气雾化钻井中液滴尺寸及其分布

本文讨论了空气雾化钻井中液滴大小的计算方法，分析了影响液滴尺寸的因素.发现液相和气相的相对速度、液体的衣面张力以及气体中液相的体积百分数足影响液滴尺寸的主要因素。     

企业核心能力初探

企业核心能力已引起我国企业界和学术界的广泛重视 ,本文对企业核心能力的涵义、基本特征、内部结构进行了阐述 ,并对企业核心能力的评价及培育问题进行了研究。     

浅析高校辅导员队伍培训平台的搭建

本文对搭建高校辅导员队伍培训平台的相关问题加以论述。