Asymptotic Behaviors of the Lorenz Curve for Censored Data Under Strong Mixing

In this article, we consider a nonparametric estimator of the Lorenz curve under censored dependent model. We show that this estimator is uniformly strongly consistent for the associated Lorenz curve. Also, a strong Gaussian approximation for the associated Lorenz process are established under appropriate assumptions. A law of the iterated logarithm for the Lorenz process is also derived.     

A New Design on Attributes Single Sampling Plans

In this article, two new approaches are introduced to design attributes single plans, and the corresponding models are constructed separately. For Approach I, an algorithm is proposed to design sampling plans by setting a goal function to fulfill the two-point conditions on the operating characteristic curve. For Approach II, the plan parameters are solved by a nonlinear optimization model which minimizes the integration of the probability of acceptance in the interval from the producer's risk quality to the consumer's risk quality. Then numerical examples and discussions based on numerical computation results are given to illustrate the approaches, and tables of the designed plans under various conditions are provided. Moreover, a fact is given to be proved that there is a relation between the conventional design and the new approaches.     

A Regression Model for the AUC of Clustered Ordinal Test Results and Working Independent Optimal Weights

We study a regression model on the area under the receiver operating characteristic curves (AUC) for clustered (or repeatedly measured) test results. To account for cluster information, we consider a weighted estimating equation for Dodd and Pepe (2003 Dodd , L. , Pepe , M. ( 2003 ). Semiparametric regression for the area under the receiver operating charateristic curve . Journal of the American Statistical Association 98 : 409 – 417 .[Taylor & Francis Online], [Web of Science ®] , [Google Scholar])'s regression model with working independence weights. We find the optimal weight in the given class of working independence weights to minimize the variance (or MSE) of regression estimators. We apply the proposed procedure to analyzing our recent experiment on diagnosing a liver disorder. In this experiment, we investigated MRI images of patients having symptoms of potential liver disorder to compare the performance of different MRI picturing methods in testing for liver disorders.     

广东出口贸易与环境污染互动关系探析

从一般经验分析与实证研究角度,对广东1990—2007年间出口贸易与环境污染关系进行探讨,并运用基于向量自回归模型（VAR模型）的广义脉冲响应函数,来考察广东出口贸易与环境污染之间的动态冲击反应,从而解释了在出口增长条件下广东工业废水排放量、工业二氧化硫排放量与工业烟尘排放量等污染指标的演变轨迹和阶段特征,认为这三项指标同出口增长的拟合曲线呈现典型的环境库尔涅茨曲线（EKC）特征。因此广东要转交外贸增长方式、增加环境保护投入和加强环境规制管理、优化和提升出口产品结构等,争取尽早跨越EKC拐点,实现环境污染与出口增长之间的解耦。     

供热系统中循环水泵变频调速的应用研究

循环水泵作为供热系统的重要运行设备,其优化运行对整个供热系统的经济运行有着重要意义。本文针对循环水泵运行效率低以及存在的相关控制问题,提出将变频调速技术应用于供热循环水泵,用调速泵代替定速泵。对循环水泵设置变频调速在供热管网中的节能效果进行了分析研究。     

经验曲线与规模经济对产品成本影响的比较分析

文章通过比较分析经验曲线和规模经济的涵义和特点,以及它们分别对企业产品成本影响区别,试图探索出运用规模经济和经验曲线的一般原则,为企业在实施成本优先战略上提供必要的理论依据和基本的运行策略。     

中国各省经济增长与环境污染关系的研究与预测——对环境库兹涅茨曲线的内在机理研究

本文利用2000年到2010年的数据对中国各省经济增长与环境污染关系(EKC)的转折点进行了预测,从规模效应、结构效应、技术效应三个方面分析了EKC形成的内在机理.同时对转折点到来时间可能出现的提前和延后进行了分析,并针对EKC形成的内在机制就如何保证环境污染逆转趋势的出现做了分析研究.预测结果显示中国不同省份转折点到来时间是存在较大差异的,这种差异主要是不同省份的结构效应和技术效应大小不同造成的,这个结果也为研究使EKC转折点提前到来的机制提供了理论依据.针对一些省份的转折点出现时间在2020年之后的实际情况,在考虑“环境承载阀值”之后对传统EKC进行的修正表明确实存在在转折点到来前触及环境承载能力极值,进而对生态环境造成毁灭性破坏的风险,本文也对这种风险的规避进行了研究.     

有毒甲藻Coolia monois细胞密度测定方法的比较研究

采用显微镜计数法、荧光分光光度法、叶绿素a含量测定法、可见分光光度法对利玛Coolia monotis指数生长期不同浓度的培养液进行细胞密度测定.结果表明后3种细胞计数方法与显微镜计数法相比较,均有较好的线性关系;同时对不同生长期的Coolia monotis培养液进行测定的结果表明,叶绿素a含量测定法与显微镜计数法得到的生长曲线一致性最好,最能真实反映Coolia monotis的生长状态,其次是分光光度法,最差的是荧光测定法.比较分析发现,叶绿素a含量测定法适用于不同细胞密度范围的测定,具有简便、计数准确、适于批量操作的优点,可确定为便捷、有效、可行的Coolia monotis细胞计数法.