对春运“民工流”人口迁移的探讨

春运“民工流”是当代中国社会结构变迁的产物。作为春运主体，民工流的出现是社会经济发展的必然结果，同时也是传统文化对人们行为选择影响的表现。民工流的迁移变化既是经济状况的反应。又深刻影响地区经济的发展。一年一度的春运带来多种社会问题。春运问题的核心并非“人多”。而是“集中”。因此对春运难题的解决不能单纯地依靠运力的增加，而要通过深刻挖掘分析春运民工流背后的社会经济文化因素进行综合治理。     

工业检测仪表性能检定设备与方法分析

本文针对某些工业检测仪表因检定(分度)条件和现场使用条件不同而使原定准确度等级名实不符的弊端,提出了根据不同类型仪表采取不同检定(分度)方法和装置的设想。文中对便携式表面温度计、热阻式热流计及辐射式温度计等几种受现场使用条件影响较大的仪表,给出了具体检定方法及装置。     

关于城镇人口就业的发展趋势与人口控制

本文阐述了人口就业在机制、渠道、就业压力等方面的发展趋势，并提出了顺应发展需要所必须选择的人口控制的若干措施和建议     

Who captures the marks for the Petersen estimator?

Summary.  We examine the claim that the well-known Petersen estimator which is used in population size estimation was not in fact used by the scientist after whom it is named. We show how, in the early years of the last century, the modern use of the Petersen estimator grew from that of the fishing coefficient. Contending with the somewhat conflicting claims that were made at the time, and what by modern standards is poor referencing of sources, we investigate where the credit lies for these concepts, and the principles and protocols which support them. We assess also how far attributions of credit were affected by practical considerations, and the history of the estimator by the nature of the problems being pursued. We identify scientists whose early work on marking and estimating fish populations deserves more credit than it has received.     

Non-parametric estimation of population size from capture–recapture data when the capture probability depends on a covariate

Summary.  In capture–recapture experiments the capture probabilities may depend on individual covariates such as an individual's weight or age. Typically this dependence is modelled through simple parametric functions of the covariates. Here we first demonstrate that misspecification of the model can produce biased estimates and subsequently develop a non-parametric procedure to estimate the functional relationship between the probability of capture and a single covariate. This estimator is then incorporated in a Horvitz–Thompson estimator to estimate the size of the population. The resulting estimators are evaluated in a simulation study and applied to a data set on captures of the Mountain Pygmy Possum.     

工程项目设计团队的知识流

通过分析工程项目设计团队的组成、知识角色和知识需求，研究了项目团队的知识流，构建了项目设计知识流模型和项目团队内、外部知识流模型，认为知识流的驱动力是知识需求，其概念中包含知识流动和知识处理的内容，知识流动方面主要包括知识的内容、载体、节点、流动路径和方向等属性；知识处理控制着知识流中知识的类别、流量、流动路径和方向，以及知识转化、合成、创新和积累的效率。     

论信息传递在课堂生态系统中的作用

课堂生态是一种由教师、学生和课堂教学环境所构成的特殊的课堂教学生态系统,在这种生态系统中,教师与学生之间、师生与教学环境之间存在着信息流。信息流只有通过传递才能体现其价值,发挥其作用。信息传递使课堂生态系统产生了调节机制,有利于提高课堂教学质量。     

A new mixture model for capture heterogeneity

Summary.  We propose a mixture of binomial and beta–binomial distributions for estimating the size of closed populations. The new mixture model is applied to several real capture–recapture data sets and is shown to provide a convenient, objective framework for model selection. The new model is compared with three alternative models in a simulation study, and the results shed light on the general performance of models in this area. The new model provides a robust flexible analysis, which automatically deals with small capture probabilities.     

当代国际资本流动:风险与对策

20世纪 90年代以来 ,国际资本流动呈现出许多新的特征和趋势。在推动经济全方位发展的同时 ,也埋下了金融危机的隐患。分析了国际资本流动冲击金融市场和金融体系带来的风险 ,探讨了我国利用和管理国际资本流动中存在的问题 ,并提出我国防范风险和管理国际资本流动的对策选择     

微翅管几何参数对混合工质流动沸腾特性的影响

对非共沸混合工质R32／R134a在水平微翅管内的流动沸腾特性进行了实验研究，获得了微翅管的翅高和翅数对换热性能的影响，并综合比较了3根微翅管的换热性能。同时，将微翅管与光管性能进行了比较。结果表明，在相同工况下，翅高为0．2mm、翅数为60的换热性能最好；微翅管的换热性能明显优于光管。