A study of the impact of environmental surroundings on personal well-being in urban China using a multi-item well-being indicator

We examine the relationship between atmospheric and water pollution, traffic congestion, access to parkland and personal well-being using a survey administered across six Chinese cities in 2007. In contrast to existing studies of well-being determinants by economists which typically employ single-item indicators, we use the Personal Well-being Index (PWI). We also employ the Job Satisfaction Survey (JSS) to measure job satisfaction, which is one of the variables for which we control when examining the relationship between environmental surroundings and personal well-being. Previous research by psychologists has shown the PWI and JSS to have good psychometric properties in western and Chinese samples. A robust finding is that in cities with higher levels of atmospheric pollution and traffic congestion, respondents report lower levels of personal well-being ceteris paribus. Specifically, we find that a one standard deviation increase in suspended particles or sulphur dioxide emissions is roughly equivalent to a 12–13% reduction in average monthly income in the six cities.     

Optimal step-stress test under Type-I censoring for multivariate exponential distribution

In this paper, we study a k-step-stress accelerated life test under Type-I censoring. The lifetime of the items follows the multivariate exponential distribution and a cumulative exposure model is considered. We derive the maximum likelihood estimators of the model parameters and establish the asymptotic properties of them. The problem of choosing the optimal time is addressed by using V-optimality as well as D-optimality criteria. Finally, some numerical studies are discussed to illustrate the proposed procedures.     

股权分置改革的投资者保护效应:基于“法与金融”理论的实证检验

股权分置改革对提高投资者保护水平、完善公司治理机制具有积极作用.这一改革符合“法与金融”的基本原理,沪深两市在股权分置改革前后五年间发生的控制权转移事件为其提供了一个可靠样本,“法与金融“理论从控制权转移市场公告反应的角度,为投资者保护效应提供了新的证据.     

探究西部中小城市文化强市路径：以泸州市为例

本文以酒城泸州为研究案例，总结了泸州文化建设的现状、问题、机遇和挑战，提出了文化强市的指导思想、战略定位、发展目标，从文化产业、文化事业、公共文化服务、市民素质、文化人才、文化品牌、城市营销等领域提出发展路径，为西部其他中小城市文化建设提供借鉴。     

Simultaneous confidence interval for assessing non‐inferiority with assay sensitivity in a three‐arm trial with binary endpoints

A three‐arm trial including an experimental treatment, an active reference treatment and a placebo is often used to assess the non‐inferiority (NI) with assay sensitivity of an experimental treatment. Various hypothesis‐test‐based approaches via a fraction or pre‐specified margin have been proposed to assess the NI with assay sensitivity in a three‐arm trial. There is little work done on confidence interval in a three‐arm trial. This paper develops a hybrid approach to construct simultaneous confidence interval for assessing NI and assay sensitivity in a three‐arm trial. For comparison, we present normal‐approximation‐based and bootstrap‐resampling‐based simultaneous confidence intervals. Simulation studies evidence that the hybrid approach with the Wilson score statistic performs better than other approaches in terms of empirical coverage probability and mesial‐non‐coverage probability. An example is used to illustrate the proposed approaches.     

新中国成立30年来农村环境的污染与治理

新中国成立30年来,中国的农村环境逐步遭受到污染,其根本原因是新中国相当长时期内执行了一条优先发展高污染的重化工业的工业化方针。为了解决日益显现出来的农村环境污染问题,政府将环境问题列入了议事日程,相应的治理措施也陆续出台。回顾历史,这一时期环境问题的出现有其特定的国际和国内背景。审视当时政府治理农村环境问题的政策和措施,其历史局限性十分明显。时至今日,这种局限性仍然没有根本改观。     

试析大学后教育在人才转型中的作用

大学后教育是高等教育的延伸和发展,也是成人教育和继续教育的重要组成部分,它具有终身性、专业岗位性、职业塑造性、灵活多样性和开放性等特点。大学后教育在提升个体的生存品质、满足个人岗位职业变动的要求和促进人与社会和谐方面显示了它的优势。大学后教育独特的教育目标、灵活的培训形式、以取得行业证书作为参考点的课程设置以及动态的课程培养体系,适合成人学习的需求。     

中部地区城市群空间演进的产业机理研究——以湖南省"3+5"城市群为例

一、前言 城市是人口集中和各种生产要素的重要集聚区，是经济辐射的源泉。城市群则是在城市发展过程中先产生以集聚为主的核心城市，再逐渐扩大到集聚与扩散并行发展的两个阶段后形成的基本布局，是促进城市合理分工和产业优化的有效形式。以信息技术为先导的新技术革命和经济全球化进程日益改变着国家和地区社会经济运行的基础，     

基于BP神经网络的偶氮苯聚合物的光致双折射特性曲线拟合

介绍了神经网络的基本原理和BP算法神经网络,并将BP神经网络应用于偶氮聚合物的光致双折射特性曲线拟合,在MATLAB环境下,利用实验数据进行了实验测试,结果表明该方法处理数据精度高,拟合效果好.     

关于中学数学教师教育科研现状的调查与分析

本文分析中学数学教师进行教育科研的困难和问题,并提出一些意见和建议.