非线性电阻网络灵敏度的计算

本文提出一种计算非线性电阻网络灵敏度的新方法.和伴随网络法相比,在多端口情况下,它具有计算量小和易于编程等特点.     

纳布科天然气管道与欧俄能源博弈

欧盟对俄罗斯能源依赖严重,俄乌天然气纠纷凸显了欧盟能源政策的脆弱性。欧盟能源多元化战略中的纳布科天然气管道项目引起俄欧围绕气源地和运输通道铺设的路线而在中亚-里海盆地、伊朗和外高加索以及土耳其、东欧等过境国展开能源地缘政治博弈,其结果将影响欧俄美关系的进程及对中国-中亚管道气源地形成竞争,而中亚天然气进入中国则是一种互惠的理性选择。俄主导的南溪管道与纳布科管道展开气源地之争,欧盟选择从伊朗进入纳布科取决于伊核问题的解决前景和美伊关系走势。俄格战争导致南高加索局势动荡阻碍纳布科项目的顺利实施。而在俄欧之间则存在着一种能源相互依赖,通过建立俄欧之间能源博弈模型所抽象出来的依赖与竞争表明,俄欧双方更多是通过改变自身收益来达到影响对方行为的目的,双方博弈也是非静态的,各自收益变量不断变化,导致现实中的均衡解也不断发生变化。俄罗斯对欧盟施加压力的成本增高,有利于欧盟能源进口多元化格局的形成。     

Exchange Rate,Income Distribution and Technical Change in a Balance-of-Payments Constrained Growth Model

This article develops a formal model that accounts for the net effect of an exchange rate devaluation on the long-term balance-of-payments constrained growth rate. Such a model investigates how a currency devaluation impacts on the home country non-price competitiveness via changes in income distribution and the rate of technological innovation. The model is built upon two plausible hypotheses. First, it is assumed that the rate of technological innovation is directly related to the income elasticity of demand for exports and inversely related to the income elasticity of demand for imports. Second, it is assumed that a redistribution of income between labor and capital has an ambiguous direct impact on the income elasticities ratio. The model shows that the net impact of a currency devaluation on growth can go either way depending on the institutional framework of the economy.     

The Latin American World Model (a.k.a. the Bariloche model): three decades ago

Almost twenty five years ago, “Catastrophe and New Society. A Latin American World Model” was published [Herrera AO et al. Catastrophe or New Society? A Latin American World Model. Canada: DRC, 1976]. It described the work of a group of Latin American researchers, led by the late Amilcar O. Herrera, and it represented both a response to the diagnostic and proposal embodied in World 3, the first world model sponsored by the Club of Rome [Meadows D, et al. The Limits to Growth. New York: Universe Books, 1972], and a new proposal for the global system. It remains to date the only global model made in the South.The present paper is a personal reflection by one of the authors of the Latin American World Model (LAWM) on what the model meant (and what it may still mean) in the context of the limits debate and the more general issue of the future(s) of the world system.     

Efficiency of Junior High Schools and the Role of Proprietary Structure

Abstract: In this paper we deal with the role of proprietary structure in explaining efficiency within the Italian school industry. We analyze a sample of 497 schools located in Piemonte, a region in the North‐Western part of the country, distinguishing between public, private for‐profit and private nonprofit schools. In stage one of the analysis, we provide robust estimates of efficiency scores, using the two most widely known techniques in applied works, namely Data Envelopment Analysis (DEA) and Stochastic Frontiers (SF). In stage two, we suggests that proprietary structure matters in explaining efficiency. Nonprofit schools are more efficient than public ones, whereas for‐profit counterparts are outperformed by public producers. Moreover, we find that foreign and disabled students affects negatively efficiency, raising concerns for cream‐skimming practices among private producers. Finally, school size is another important determinant of efficiency.     

一个标谁一次检验全球接受

标准与检验携手并进,缺一不可,已成为推动全球大市场发展的重要力量.标准为产品、服务、相关体系、生产过程及相关材料等提供了相应的技术规范和质量要求.检验则是验证这些标准是否可靠地得到实现.一旦标准在国际上得到广泛的认可,它就成为相关产品或服务的国际市场的发展依据,这就表明这个市场建立在可靠的质量基础之上,有较高的消费者信任度.     

用横向谐振法计算矩形腔的Q值

本文采用横向谐振法结合微扰的概念计算矩形谐振腔的无载Q值,推算简单,结果与其它方法一致。