人力资本与技术溢出:基于进口传导机制的实证研究

本文研究了以进口贸易为传导机制的国际技术溢出对我国全要素生产率的影响。结果表明，通过进口贸易传导机制，国内研发、贸易伙伴国溢出的研发与我国全要素生产率之间存在着稳定的长期均衡关系；国外研发溢出是与人力资本相结合采促进全要素生产率提高的，人力资本在技术溢出中发挥着关键的作用。     

模拟人体热损失来评价热环境的传感器设计

从理论上对人体与外界环境的热交换进行了分析，并结合人体的物理特性：投影面积系数和对流换热系数与椭球体的相似性，以及中国人的部分生理参数，计算了模拟人体热损失的传感器的设计参数。     

Weak Ties in Networked Communities

Communities with high levels of social capital are likely to have a higher quality of life than communities with low social capital. This is due to the greater ability of such communities to organize and mobilize effectively for collective action because they have high levels of social trust, dense social networks, and well-established norms of mutuality (the major features of social capital). Communities with “bridging” social capital (weak ties across groups) as well as “bonding” social capital (strong ties within groups) are the most effective in organizing for collective action. People who belong to multiple groups act as bridging ties. When people with bridging ties use communication media, such as the Internet, they enhance their capability to educate community members and to organize, as needed, for collective action. This article summarizes evidence from stratified household survey data in Blacksburg, VA, showing that people with weak (bridging) ties across groups have higher levels of community involvement, civic interest, and collective efficacy than people without bridging ties among groups. Moreover, heavy Internet users with bridging ties have higher social engagement, use the Internet for social purposes, and have been attending more local meetings and events since going online than heavy Internet users with no bridging ties. These findings may suggest that the Internet—in the hands of bridging individuals-is a tool for enhancing social relations and information exchange, and for increasing face-to-face interaction, all of which help to build both bonding and bridging social capital in communities.     

多发性双胞胎家系的遗传分析

报道了3个多发性双胞胎家系，在这3个家系中有环境因素起主导作用的，有遗传因素起主导作用的，而这些因素都是通过母体发生效应的。     

证据确定性因子求取的算法

证据确定性因子的求取是不确定推理的关键。对于不确定性推理中证据是多个条件的合取或析取连接的情况进行了较为详尽的探讨和分析, 提出了新的算法,并通过实例进行运用示范,尽管计算量有所增加,但准确性可大为提高。     

Nonlinear dynamic buckling of stiffened plates under in-plane impact load

INTRODUCTION Dynamic buckling of structures under impactloading has become a research hotspot and hasreceived increasing attention in the last decade fromdesigners of modern engineering structures. Mostpast investigations focused on simple structuressuch as columns, plates and cylindrical shells; pa-pers dealing with stiffened plate structures withwide application in engineering are limited. Zizicas (1952) investigated the dynamic buckl-ing of thin elastic plates. A theoretical solution f…     

高校学生社团的组织承诺及其影响因素分析

作为一个社会心理学概念 ,组织承诺反映出大学生成员对高校学生社团的认同和投入程度。它极大地影响了学生社团的正常运行 ,也决定着这种学生组织的兴衰荣败 ,甚至在一定程度上影响了大学校园文化的发展。通过对经验资料的分析 ,重点探讨 :1 .当前大学生社团的组织承诺状况 ;2 .影响大学生社团组织承诺的结构性因素。最后 ,文章将对有关学生社团的管理问题提出自己的几点建议。     

大型综合超市选址评价体系构建

大型综合超市是近几年我国应运而生的迅猛发展的一种商业业态。国内零售业业内人士都意识到，只有大型综合超市的选址做到科学、合理、正确，才能在竞争中立于不败之地。从大型综合超市的商业特征和效益成本角度出发，列出诸多选址因素，对影响大型综合超市所有影响因子进行逐一分析。旨在提出一套大型综合超市选址因素评价体系，以期提高选址工作的科学性。     

关于加法分拆数的一个求值公式

文章构造了一个二元递推函数式,从而用初等的方法求得加法分拆数的一个公式 。     

推导热力学系统平衡态统计分布的另一种方法

用一种新的方法－－爱因斯坦方法来推导热力学系统的平衡统计分布，使我们从微观角度上对平衡态及平衡态统计分布有更深的理解。