陕西省南郑县户用沼气池经济效益分析

本文通过对陕西省南郑县产用沼气泡成本、收益和经济效益的分析评价，希冀以效益促进户用沼气池的推广。通过投入要土的企敏度分析，指出户用沼气池推广的关键因土，并提出对策性建议。     

再看“计划”与“经济”

在当时的历史条件和环境的作用下,新中国建立后选择了计划经济模式。计划经济时代成为新中国社会经济发展一个不可逾越的历史阶段,构成了中国后来一系列社会经济变革发展的历史前提。但是不可否认,即使是再科学的理性计划体制,也会因为自身的种种局限与弊端而不得不进行改革,更何况中国当时实行的只能算是"非理性的命令经济"。改革不可避免,但绝非是对"计划"的完全抛弃,我们可以从"计划经济"走向"经济计划"。     

ALTERNATIVE WEIGHTING APPROACHES TO COMPUTING INDEXES OF ECONOMIC ACTIVITY

This paper compares the weighting schemes in the traditional, principal component and dynamic factor approaches to summarizing information from a number of component variables. To facilitate the comparison, we propose a framework to discuss the approaches with respect to their implied loadings in a latent variable model. We also propose a way to transform the dynamic factor index into an analogous index which is a weighted average of the components. The framework shows the strengths and weakness of the alternative weighting schemes and the sense in which the dynamic factor approach has the advantage of capturing both the significance and the variability of the components.     

水泥稳定碎石的作用原理及在公路施工中的应用

水泥稳定碎石作为路面基层,具有早期强度高,雨季对施工影响相对较小,施工机械化程度较高等特点,这些都有利于保证进度和质量,因此被越来越广泛地应用到市政道路工程中去。为此,本文针对城市道路半刚性基层采用水泥稳定碎石的技术研究进行简要分析,以供参考。     

经济增长与环境

在政府不参与环境控制时,经济增长率最高,但污染也最严重,社会福利要比政府采取补贴情形时低.通过建立模型推导出了在放任政策下的经济增长率是最快的,但污染比较严重。     

Explaining Growth: A Contest Between Models

Recent contributions to the empirical growth literature show no tendency to convergence in specification, as researchers seek to identify new variables that can account for significant regional effects in earlier work. We conduct non-nested tests between the models of Barro (1997), Easterly and Levine (1997) and Sachs and Warner (1997). The data strongly prefer an encompassing model, but fail to reject any of the candidate models, implying that each model represents a partial truth. We identify a model that includes most (but not all) of the regressors in the candidate models and is robust to the inclusion of regional dummies.     

The French Communication Industry Defined and Analyzed through the Social Fabric Matrix,the Filiere Approach,and Network Analysis

This paper examines the relative impact of economic freedom, civil liberties, and political rights on growth. A system of three simultaneous equations is used to unearth the channels through which these institutional dimensions affect economic growth. These include greater efficiency and enlarged investment in physical and human capital. The sample contains 79 countries and six periods covering the years from 1976 to 2005. The results show that the three dimensions of institutional quality are important for economic growth either through a better allocation of resources or, indirectly, through the stimulation of investment in physical and human capital.