王纲解纽——论中国散文作为一种权力话语——读郭预衡先生《中国散文史》的思考

通过对郭预衡先生治散文史的一个重要命题“王纲解纽”多方面的考查和展开,阐述了王纲的常态和异态与文人作家的生存维度的内在关系,分析了文人——帝王双向依附的关系,以及帝王作为散文接受主体及其影响散文流变的情形,说明了中国古代散文作为一种权力话语的性质,肯定了郭著从本土话语入思的意义与价值。     

Weak convergence of bivariate sequence to bivariate normal

It is shown that under certain conditions the distributions of a bivariate sequence of random vectors converge weakly to that of a bivariate normal distribution.     

组织中次级单位权力配置格局:一个整合模型

本文关注组织内次级单位间权力不均衡配置及其变迁。在回顾战略权变理论、资源依赖理论和制度理论相关研究基础上,提出一个整合框架,认为特定时期内次级单位在组织权力配置格局中的相对地位,由环境、结构、次级单位特征及个体特点等四层次要素决定,已有的权力配置格局因受组织惯性的影响和自我强化机制的存在而具有一定的稳定性,并随上述要素的变迁而处于不断变化中。     

人口、经济和技术对二氧化碳排放的影响分析——基于动态面板模型

气候变化和二氧化碳减排问题已经引起了世界性的关注。一般而言,一个国家的二氧化碳排放量是由多种因素共同作用决定的,并且这些因素对碳排放量的作用可能有所不同。文章基于动态面板模型,利用中国30个省份的相关数据,分析了二氧化碳排放与人口、经济、技术的关系。结果表明,人口、经济和技术对不同地区二氧化碳排放的影响是不一样的。其中人口对二氧化碳排放的影响呈现明显的双向性,经济增长对碳排放具有较强的促进作用,而技术进步则在一定程度上缓解了二氧化碳排放。另外,二氧化碳排放表现出明显的路径依赖现象,当期经济增长将至少对未来1~3年的空气质量产生影响。基于上述结论,文章提出了减少二氧化碳排放的相关政策建议,以适应中国的低碳经济道路。     

对外技术依存度若干问题研究

对外技术依存度是我国衡量自主创新能力的指标之一。但从现有的测算方法看还存在着一定的问题。本文依据技术国际收支数据讨论了测算方法的改进,并认为对外技术依存度的标准不能一刀切,对发达地区和欠发达地区应建立不同的标准。     

Mobile phones and core network growth in Kenya: Strengthening weak ties

In contrast to recent US studies showing a decrease in core network size, our Kenyan data reveals substantial network growth. We attribute this to the diffusion of mobile telephones. Results from pooled survey data from Nairobi professionals and entrepreneurs in 2002 and 2007 as well as qualitative interviews from 2007 to 2009 show virtual saturation in the diffusion of phones during this period, but no direct effect of technology use. What explains this puzzle is a network effect of mobile telephony: increased technological access to existing networks in a context of resource scarcity leads to a strengthening of weak ties and the enhancement of core networks among Kenyans. Video ethnographic data before and after the 2007 post-election unrest supports this interpretation, showing that mobile phones are a crucial resource in managing interpersonal networks for instrumental purposes.     

How institutional context alters social reproduction dynamics: Ethnic track placement patterns in the U.S. and Germany

How does institutional context shape the way family dynamics, especially ethnic background and parental resources, affect track placement? We contrast the track placement patterns of immigrants and ethnic majority students in two countries marked by drastic differences in the social organization of schooling. Drawing on German (GSOEP) and U.S. (NELS) data, we find that, in general, more family resources pull students from lower to higher tracks, but ethnic inequalities in these resources favor the ethnic majority groups in both countries. In addition, institutional context conditions which parental resources shape educational outcomes, and how they do so. We find that the effects of parental ties exacerbate ethnic inequalities between whites and Latinos in the U.S.; whereas in Germany, parents’ community ties play a compensatory role for immigrants, who benefit from interactions with secular and ethno-religious groups. Our findings confirm previous cross-national research, but they also highlight the need to elaborate the relationship between institutional context and ethnically specific reproduction mechanisms within countries.     

青少年网络依赖的成因及干预策略

当前我国有5％～10％的青少年过度使用网络,形成网络依赖心理。网络依赖主要是一种心理依赖,比一般的上瘾现象有着更为复杂的心理成因和独特的特点。青少年形成网络依赖,有家庭、学校、青少年个人和网络本身等原因,因此青少年网络依赖干预模式应是多样化的、个别的、具体的,对青少年网络依赖的干预应是多层面的、多层次的、整体的。     

A note on joint mix random vectors

Abstract

This note studies the dependence of joint mix random vectors from the perspective of covariance matrix. We first provide two useful methods in simulations to construct joint mix for Normal distribution. Then, we propose to characterize joint mix by covariance matrix for general marginal distribution. We present some examples showing that our methodology could provide supplementary results to relevant studies in literature.