所有权安排与监事会治理效率——基于中国上市公司的实证发现

以2002年到2004年中国A股上市公司为样本,本文发现国有上市公司的监事会治理绩效要劣于非国有企业.但是,在国有企业中,随着第一大股东持股比例上升,监事会治理绩效逐渐增强.而在非国有企业中,随着第一大股东持股比例上升,监事会治理绩效则有轻微下降的趋势.这表明,监事会制度是一种依赖于产权安排的相机治理机制.     

Racial/Ethnic Differences in Income Inequality Across US Regions

In this study we investigate the differences in income inequality among different racial/ethnic groups in the United States using both personal and household income. We find that income inequality is negatively related to the percentage of males but that the impact is muted for blacks as opposed to whites or Hispanics. In addition, we find income inequality among blacks and Hispanics is affected in vastly different ways, due to unemployment, than for whites. Finally, the impacts on inequality from the exclusion of given groups is significantly influenced by education and the percentage of males contributing to household income but not in a uniform manner for whites, blacks, and Hispanics.     

解读当今国际货币秩序的新范式——复活的布雷顿森林体系论述评

近年来,Michael Dooley,David Folkerts-Landau,Peter Garber等学者在讨论当今不平衡的国际经济货币秩序时,提出了所谓复活的布雷顿森林体系范式。他们认为当今的国际货币秩序本质上就是二战后布雷顿森林体系的延续(或者说是复活),只不过是在某些方面作出了适应性的调整,它反映了当今国际经济货币秩序的现实。与早期布雷顿森林体系相比,这一新的制度在内涵、基本特征、以及对当今国际经济货币关系的影响等方面都具有新的表现形式。在这一复活的秩序中,中国等新兴市场国家成为重要的支撑力量和驱动力量,它们通过政府行为一直在努力维持这一秩序,并借助这一秩序来促进各自国内经济的长期稳定发展。     

Do sunspot numbers cause global temperatures? Evidence from a frequency domain causality test

This article applies the causality test in the frequency domain, developed by Breitung and Candelon (2006), to analyse whether sunspot numbers (used as a partial approximation to solar irradiance) cause global temperatures, using monthly data covering the time period 1880:1–2013:9. While standard time domain Granger causality test fails to reject the null hypothesis that sunspot numbers do not cause global temperatures for both full and sub-samples (identified based on tests of structural breaks), the frequency domain causality test detects predictability for both the full-sample and the last sub-sample at short (2–2.6 months) and long (10.3 months and above) cycle lengths, respectively. Our results highlight the importance of analysing causality using the frequency domain test, which, unlike the time domain Granger causality test, allows us to decompose causality by different time horizons, and hence, could detect predictability at certain cycle lengths even when the time domain causality test might fail to pick up any causality. Further, given the widespread discussion in the literature, those results for the full-sample causality, irrespective of whether it is in time or frequency domains, cannot be relied upon when there are structural breaks present, and one needs to draw inference regarding causality from the sub-samples, we can conclude that there has been an emergence of causality running from sunspot numbers to global temperatures only recently at cycle length of 10.3 months and above.     

全球生物芯片产业技术发展阶段比较研究

生物芯片技术是21世纪科技发展的制高点,是各国重点发展的新兴技术。基于全球7 894项专利,运用S成长曲线模型,实证研究了全球生物芯片产业技术发展阶段,通过对比各国发展阶段,为中国制定新兴产业技术发展规划提供决策参考。结果表明,美国在全球生物芯片技术主导设计方面具有先驱优势;日本与韩国的生物芯片技术发展最快;德国与法国生物芯片技术萌芽期较短,技术消化吸收能力与自主研发能力较强;中国生物芯片技术发展尚缓,成长期为2006-2022年,与其它主要技术拥有国存在一定差距。     

离子选择性电极法测定牙膏中的氟含量

[目的]探讨TISAB溶液作为金属离子掩蔽剂和OH-离子的pH调节剂对氟离子选择电极测定牙膏氟含量的影响.[方法]进行不同条件、不同方法的对比实验.[结果]选用TISAB(I),用量控制在60～80mL,适宜测定的pH值为6～7,回收率为98.6%～104.00%,RSD＜2.7%.[结论]分析方法的准确度、重现性、线形关系、稳定性均能达到科研和生产的要求,操作简便,可推广用于化妆品中氟含量的测定.