直读式粉尘浓度测量仪示值误差的测量不确定度评定

通过粉尘测量仪表检定装置对直读式粉尘浓度测量仪示值误差进行不确度评定。     

浅谈如何提高汽车的燃油经济性

目前,绝大多数汽车都是消耗燃油的,随着汽车保有量的增加,汽车消耗的燃油占石油产品消耗量越来越大,如何减少对石油产品的消耗,节约石油资源已成为举世瞩目的问题,而且从汽车使用的单位和个人角度来讲,降低燃油的消耗也是至关重要的,因此,我们有必要分析一下影响汽车燃油经济性的因素及提高汽车的燃油经济性的措施。     

Is there a diversification “cost” of Shari’ah compliance? Empirical evidence from Malaysian equities

Islamic equity portfolios work with a smaller investment universe given the filtering of non-Shari’ah compliant stocks. It has been theoretically argued that this culminates in suboptimal portfolio diversification, which in turn adversely affects risk-adjusted returns. We offer empirical evidence that such a conceived portfolio diversification “penalty” is far from a foregone conclusion, at least empirically. Our results tend to indicate that Islamic portfolios are not invariably handicapped in terms of portfolio diversification. We also explored dimensions that may account for differences in the relative investment performance between Islamic and conventional portfolios, such as portfolio constraints, short selling and market conditions. We believe this paper is among the first to apply substantial empirical analysis specifically with respect to the portfolio diversification perspective on Islamic equity investments.     

全自动洗衣机用直联单相盘式电动机的设计

介绍家用波轮型全自动洗衣机用直联单相电容运转盘式电动机的结构特点,主要性能指标以及在 研制过程中遇到的问题。     

喷粉桩在广州地区软基处理中的应用

文章通过分析喷粉桩工作原理,总结广州地区的经验,对喷粉桩的设计提出了见解。     

Estimating panel data models in the presence of endogeneity and selection

We consider estimation of panel data models with sample selection when the equation of interest contains endogenous explanatory variables as well as unobserved heterogeneity. Assuming that appropriate instruments are available, we propose several tests for selection bias and two estimation procedures that correct for selection in the presence of endogenous regressors. The tests are based on the fixed effects two-stage least squares estimator, thereby permitting arbitrary correlation between unobserved heterogeneity and explanatory variables. The first correction procedure is parametric and is valid under the assumption that the errors in the selection equation are normally distributed. The second procedure estimates the model parameters semiparametrically using series estimators. In the proposed testing and correction procedures, the error terms may be heterogeneously distributed and serially dependent in both selection and primary equations. Because these methods allow for a rather flexible structure of the error variance and do not impose any nonstandard assumptions on the conditional distributions of explanatory variables, they provide a useful alternative to the existing approaches presented in the literature.     

希腊债务危机的负面影响与警示

对希腊债务危机的内外部原因进行分析,剖析希腊债务危机的负面影响,主要表现在:影响欧元区乃至欧洲经济的稳定,危机可能会蔓延到部分欧洲银行,债务解决出现两难困境,可能诱发全球赤字浪潮爆发,造成全球经济的波动。总结出希腊债务危机启示:欧盟①组建强有力的欧洲货币基金组织对债务问题进行及时有效的救助,金融创新需要与实体经济发展相匹配;对中国而言,尤其是要关注各级地方政府积累的巨额债务。     

基于相关联原则分析国家标准采标率的研究

传统采标率已不能科学反映我国采标工作的发展水平。本文根据国际标准化的发展情况和我国标准化工作的实际,提出了基于相关联原则计算采标率的方法。     

Migrants and International Economic Linkages: A Meta-Overview

Abstract

The migration issue is a much debated subject in many developed countries. This study provides a review of the relationship between migrants and their international economic linkages. It then focuses on foreign direct investment (FDI), for both inward and outward FDI. This study aims to offer a synthesis by means of a meta-analysis of various studies, in order to test the robustness of the relationship between migration and FDI. Our results confirm that immigration has a positive impact on FDI investment in both directions (inward and outward), and that these impacts are higher when migrants are highly educated and skilled.

RÉSUMÉ Le problème de la migration est un sujet qui suscite un intérêt considérable dans un grand nombre de pays évolués. Cette étude passe en revue les rapports entre les migrants et leurs liens économiques internationaux. Elle se penche en suite sur les investissements étrangers directs (IED), tant pour les IED étrangers que pour les investissements à l’étranger. L’étude s'efforce de présenter une synthèse par le biais de méta-analyses de différentes études, dans le but de tester la solidité des rapports entre migration et IED. Nos résultats confirment que la migration a eu un effet positif sur les investissements IED dans les deux sens (de l’étranger et à l’étranger, et qu'elle a un impact majeur lorsque les migrants sont des personnes haute ment qualifiées et spécialisées.

RESUMEN La inmigración es un tema muy debatido en muchos países desarrollados. Este estudio proporciona una reseña de la relación entre los inmigrantes y sus enlaces económicos internacionales. Después se enfoca en la Inversión Extranjera Directa (IED), tanto de entrada como de salida. Este estudio tiene como objetivo ofrecer una síntesis mediante un metanáli sis de estudios varios para evaluar la solidez de la relación entre inmigración y la IED. Nuestros resultados confirman que la inmigración tiene un impacto positivo sobre la IED en ambas direcciones (entrada y salida), y que estos impactos son mayores cuando los inmigrantes tiene un alto nivel de educación y cualificación.

     

“Third World” Multinationals Revisited

Abstract

The notion of “Third World Multinationals” has always been, at least, slightly misleading, and has now also become obsolete, taking into account the dismantlement of most of the ideological divides between different political and economic blocks since the early 1990s, and the new rules of the games imposed by globalization. Furthermore, new multinationals emerging from China, and also from the former Soviet republics, are demanding a new and more flexible taxonomy. The present paper re-defines “Multinationals from Developing Countries” (MEDCs) and it reviews first, the current literature on multinationals, looking at the key factors which may explain the internationalization process of enterprises coming from outside the traditional, developed, and industrialised world, and also whether they may enjoy specific sources of comparative advantages, different from those ascribed to the old, established multinationals. A statistical appendix provides a brief but comprehensive survey of the current status of MEDCs, pointing out that, at the end of the day, there are roughly only four such enterprises in the usual rankings of the first one hundred multinational corporations, worldwide, and that the prospects of a forthcoming, and enhanced upgrading in the global corporate structure are heavily geared towards Asia. The data would also seem to support the argument that sheer “scale”, as such, of the enterprises does not explain a greater or lower degree of “transnationalization,” a conclusion which, added to that of the greater flexibility provided by the new information technologies, could be goods news for small-and medium-sized enterprises coming from the developing world.