水平圆管内R410A的凝结换热特性研究

在一管内冷凝换热实验台上进行R410A流动冷凝换热实验，旨在研究水力工况、测试管管径对管内换热特性的影响进行探究。实验选用测试水雷诺数表征 水力工况，选取换热系数、压降作为管内换热特性的衡量指标；并将实验数据与经典关联式预测值进行比较，扩展关联式的适用范围。实验结果显示：换热系数 及压降均随着质量流速的增加、管径的减小逐渐增大，虽然换热系数随着测试水雷诺数的增加而减小，但测试水雷诺数对压降影响很小；Shah关联式和Thome关 联式能够较好的预测实验数据，平均预测误差分别为18.83%和6.28%，而Akers关联式的预测值的平均误差达31.04%，足以证明其并不能准确预测实验数据。     

Framing the rabbit to snare the votes

Results in cognitive psychology and experimental economics suggest that people are prone to systematic misperception of policy. This paper embodies voters’ misperceptions of policy into a standard political economy framework with complete information, and examines whether and to what extent political parties may use this misperception to manipulate voters and derive political gains. We analyze the equilibria and welfare implications for different setups. A payroll tax incidence detailed example is used to illustrate the framework. The paper is based in part on a chapter in the second author’s Ph.D. dissertation. The authors wish to thank Elhanan Helpman, seminar participants in Silvaplana and Bonn University and two anonymous referees for helpful comments and suggestions. The authors are grateful for financial assistance by the Sapir Fund.     

罗尔斯正义理论的宪政之维--从《正义论》到《政治自由主义》

罗尔斯正义理论呈现出阶段性的修正和转换.文章通过西方宪政传统这一维度,考量了罗尔斯正义理论的确立和转换.认为促使其理论转换的深层原因在于正义原则对宪政民主政体有一种内在要求,其理论实质乃宪政之正义,同时,这一研究有助于更深一层理解现代西方自由主义的政治理性之实质.     

Three-stage and ‘accelerated’ sequential procedures for the mean of a normal population with known coefficient of variation

Three-stage and ‘accelerated’ sequential procedures are developed for estimating the mean of a normal population when the population coefficient of variation (CV) is known. In spite of the usual estimator, i.e. the sample mean, Searls' (1964 Searls, DT. (1964). The utilization of a known coefficient of variation in the estimation procedure. J. Amer. Statist. Assoc, 50: 1225–1226.  ) estimator is utilized for the estimation purpose. It is established that Searls' estimator dominates the sample mean under the two sampling schemes.     

Organizational Capital and Joining-up: Linking the Individual to the Organization and to Society

Do employees ever make efforts on behalf oftheir employing organization's interests or fellowemployees' interests when it is not in their directself-interest to do so? By drawing on organizationalbehavior literature relating to the joining-up process,organizational commitment, and organizationalcitizenship behavior, and integrating these insightswith economic theory, this article provides a newexplanation of why employees' efforts are typicallysuboptimal and what organizational activities canresolve this problem. The key variable explainingwhether organization members behave responsibly or notis the presence of organizational capital formedeither during the joining-up process or in preparationfor it.     

R134a在螺纹管内冷凝换热及压降特性

为了研究冷凝温度和管径对3种内螺纹管内制冷剂R134a流动换热系数和压降的影响，对3根不同管径的内螺纹管（6.35,7.00 和8.00 mm）在不同冷凝温度下（35，40和45 ℃）进行了冷凝实验。探究了冷凝温度、螺纹管直径和质流密度对换热特性及压降的影响。实验结果表明：冷凝温度 越低，制冷剂侧传热系数越高，压降也越大。6.35 mm管的制冷剂侧传热系数最大，压降也最大，但单位压降冷凝传热系数μ（μ=hr/ΔP）最高，综合性 能最佳。     

美国经济再平衡中的制造业复兴战略

全球不平衡发展模式主要来源于美国负债型的不平衡经济增长模式。2008年金融与经济危机后奥巴马政府推出的制造业振兴战略是美国走向再平衡发展的核心战略。通过观测美国经常账户逆差的调整与制造业复苏的现状,分析美国制造业振兴的基础可以看出,美国制造业复苏与经常账户再平衡调整正在同步进行,并向制造业长期复兴的趋势转换。     

Explicit formulas for the cumulants and the vector-valued odd moments of the multivariate linearly skewed elliptical distributions

In this letter explicit expressions are derived for the cumulants and the vector-valued odd moments of the multivariate linearly skewed elliptical family of distributions. The general calculations of such moments are described by multivariate integrals which complicate the calculations. We show how such multivariate computations can be projected into a univariate framework, which extremely simplifies the computations.     

Good habits and bad habits: A new age socio-economic model of preference formation

In contrast to neoclassical economics which generally takes consumer preferences as given, the model developed here explains how a person's preferences for consumer goods change over time and may change for the better or worse. This is a four self model. The four selves correspond to four types of preferences: actual preferences, metapreferences, true preferences, and unrestrained preferences. An individual's initial actual preferences reflecting one's investment in consumption capital are likely to change to the extent that they differ either from ones metapreferences or one's unrestrained preferences. Temptations from the latter could lead to a deterioration of actual preferences. Or the intrapsychic stress that occurs when metapreferences are significantly out of synch with actual preferences could lead to improved actual preferences. A person's actual preferences improve when they change toward true preferences, the unique set of preferences that represent what is really and truly the best for that person.