A comparison of estimators for the mean in the inverse gaussian distribution with a known coefficient of variation

In this paper, we discuss an estimation problem of the mean in the inverse Gaussian distribution with a known coefficient of variation. Two types of linear estimators for the mean, the linear minimum variance unbiased estimator and the linear minimum mean squared error estimator, are constructed by using the squared error loss function and their properties are examined. It is observed that, for small samples the performance of the proposed estimators is better than that of the maximum likelihood estimator, when the coefficient of variation is large.     

A Laguerre polynomial approximation for a goodness-of-fit test for exponential distribution based on progressively censored data

This paper proposes an approximation to the distribution of a goodness-of-fit statistic proposed recently by Balakrishnan et al. [Balakrishnan, N., Ng, H.K.T. and Kannan, N., 2002, A test of exponentiality based on spacings for progressively Type-II censored data. In: C. Huber-Carol et al. (Eds.), Goodness-of-Fit Tests and Model Validity (Boston: Birkhäuser), pp. 89–111.] for testing exponentiality based on progressively Type-II right censored data. The moments of this statistic can be easily calculated, but its distribution is not known in an explicit form. We first obtain the exact moments of the statistic using Basu's theorem and then the density approximants based on these exact moments of the statistic, expressed in terms of Laguerre polynomials, are proposed. A comparative study of the proposed approximation to the exact critical values, computed by Balakrishnan and Lin [Balakrishnan, N. and Lin, C.T., 2003, On the distribution of a test for exponentiality based on progressively Type-II right censored spacings. Journal of Statistical Computation and Simulation, 73 (4), 277–283.], is carried out. This reveals that the proposed approximation is very accurate.     

人口因素对CO2排放的影响:区域差异与动态变化

基于1995—2009年中国省级面板数据,利用IPAT模型建立基本的分析框架,研究人口数量、人口年龄结构、人口城市化率以及家庭规模等人口因素对我国CO2排放的影响,结果显示,由于人口因素与CO2排放的关系与经济发展特征有关,而我国处于经济快速增长的过程中且区域经济发展存在差异,使得影响我国全国CO2排放的人口因素不同于各区域内部,在经济发展的不同阶段、甚至不同年份,导致省际CO2排放差异的人口因素也在不断变化。     

中国人口增长:过去的演变和未来的预测

本文讨论了过去４５年中国人口生育率和死亡率的变化趋势,据此趋势作出了三个生育率和死亡率的假设,由此预测了未来５０ 年中国人口的增长。最后讨论了两个重要的人口增长的影响因素：就业和人口老龄化     

具有变系数的2n阶中立型微分方程正解的存在性

本文给出具有变系数Ｐ（ｔ）的２ｎ阶中立型微分方程 （ｘ（ｔ）－Ｐ（ｔ）_ｘ（ｔ－τ））~（２ｎ）+ｆ（ｔ,ｘ（ｔ－τ_1（ｔ））,...,ｘ（ｔ－τ_ｍ（ｔ）））＝０正解存在的若干个充分条件．本文结果部分地回答了文［１］提出的问题．     

Codes, Stakeholders and Business Philosophy

Two concepts that business ethics has made its own are codes of practice and stakeholding. They pre-date the self-conscious, organised business ethics effort. Codes are standard in large businesses in the United States, but are not so widely used elsewhere. Stakeholder models remain largely aspirational. Both concepts have critics, and their practical value has yet to be proved. Despite this, they have the potential to transform the quality of business life. Their main strength is in combination with an appropriate business philosophy, which does not yet exist. Widely respected business values can be identified, but they need to be founded on basic principles, which is a requirement for any discipline to move from ideology to maturity. Some possible principles are suggested. An illustration is taken from financial services regulation, where markets are generally seen (to borrow Rousseau's phrase) as having to be ‘forced to be free.’ This revised version was published online in July 2006 with corrections to the Cover Date.     

POCAGE码的编码的算法与编程

通过对BCH( 31 ,2 1 )码生成矩阵的变换 ,提出了一种POCAGE码软件编码算法 ,并给出了相应的程序 .     

4-乙酰基-2-蒈烯的合成

利用硫酸盐松节油中的３－蒈烯合成了具有薄荷样清凉香气的４－乙酰基－２－蒈烯．通过实验确定了如下适宜的合成条件：３－蒈烯与乙酸酐的重量比为１∶２,催化剂用量为３％,反应温度为７０℃,反应时间为６ｈ．产品得率７４．８％,主要副产物为４－乙酰基－３（１０）－蒈烯和４－乙酰基３－蒈烯．     

产业规制中的决策行为及其属性——一个解说政府和厂商行为的分析框架

现有的关于产业规制中的政府和厂商决策行为的分析和研究,受理性经济人范式的影响极为深刻,它通常以效用最大化为原则将政府和厂商的行为属性理解或描述为理性决策.其实,无论是产业规制中的政府立法、司法和执行的实际运作,还是垄断性或竞争性厂商对规制政策的应对,都或多或少存在着非理性决策的成分,并且其决策行为在一定程度上会偏离效用最大化.规制经济理论的发展离不开对政府和厂商的决策行为及其属性的研究,而研究决策行为属性则需要有可行的分析路径.如果我们在评说规制经济学相关理论的基础上能对政府和厂商的行为属性有创新式理解,将有助于规制理论框架的重塑.     

普遍性理论和二语习得研究

本文从Chomsky的普遍性理论出发 ,以母语迁移和标记理论为线索 ,讨论了二语习得中的对比分析理论、错误分析理论、语言运用分析理论的发展过程及其对二语研究所作的理论贡献。还指出 ,近年来二语习得研究中有趋向于一些微观研究的新动向