有限尺寸介质基片上的共面带线

讨论了厚度和宽度都为有限尺寸的介质基片上共面带线的基本参数;有限尺寸介质基片上的共面带线是一种非常接近于工程应用状态的物理模型。用共形映射技术分析这种共面带线,得到了单位长度电容、有效介电常数和特性阻抗等基本参数;与介质基片宽度为无限大的理想化模型作了比较;给出了以无限宽介质基片共面带线作近似模型,介质基片宽度变化所产生的误差;讨论了多层有限尺寸介质基片上的共面带线     

面向新世纪创新人才的培养

面向新世纪,培养高素质的创新人才已成为世界各国高校关注的热点,创新的关键在人才,人才的成长靠教育,培养创新人才,高校必须转变教育思想观念,加强素质教育育,加强教师队伍建设,开展创造性教学,深化教学改革。     

把握时代要求创新社会科学

反映时代的要求是社会科学发展的基本规律。问题是“时代表现自己的精神状态的 最实际的呼声”,社会科学工作者要增强“问题意识”,善于捕捉问题;运用时代的眼光即 普遍性的眼光、多样性的眼光、实践性的眼光观察问题,是社会科学工作者的基本功;理论 创新是时代的要求,也是社会科学工作者的神圣使命。     

用闭环可控恒流源供电测量线束接头接触电阻

针对线束接头接触电阻测量的特点，提出了一种采用闭环可控恒流源系统供电的测量线束接头接触电阻的方法，此法具有精度高、自动检测、自动定标等特点，整个测量系统的精度可达０．５％。     

Diffusion of innovations through social networks: Determinants and implications

Social scientists have long been interested in the diffusion of innovations—the process by which new ideas, behavior, and practices spread between persons, organizations, and even countries. While innovations can enter a community through various channels, ongoing spread of innovations through a community occurs through the medium of social networks—collections of interpersonal or digital relationships connecting actors to each other. Social networks are important for diffusion because relationships foster communication, trust, and flow of information. Diffusion outcomes are also shaped by the structural properties of social networks such as density, centrality, and strength of ties, as well as properties of the innovation and the actors involved in the process. The purpose of the article is twofold: (1) to take stock of the field and review ongoing debates on the role of social networks in the diffusion of innovations and (2) to summarize the sociological implications of the diffusion of innovations through social networks.