Does technological diversification promote innovation?: An empirical analysis for European firms

This paper analyses the impact of technological diversity on innovative activity at the firm level. The empirical study on a panel of European R&D active companies shows that both R&D intensity and patents increase with the degree of technological diversification of the firm. Possible explanations are that, on the one hand, a firm that diversifies its technology can receive more spillovers from other (related) technological fields. On the other hand, diversification can reduce the risk from technological investments and it creates incentives to spend more on R&D. The paper provides empirical evidence relevant to the diversity-specialization innovation debate.     

弯管列当的补充描述

The name Hydrocotyle chinensis (Dunn) Craib (Apiaceae) used in 《Flora Reipub- licae Popularis Sinicae》 has had a confused history and is also a later homonym of H. chinesis L. Hydrocotyle shanii is proposed as a new name for this species to commemorate ProfessorRen-hwa Shan's lifelong study of the Apiaceae.     

The network of innovators in Jena: An application of social network analysis

We apply social network analysis methods to describe the evolution of the innovator network of Jena, Germany in the period from 1995 to 2001. We find this evolution to be directed towards an increasing focus on core competencies of the network. Further we analyse the network resulting from R&D cooperations and explain - by means of network regression techniques - that the job mobility of scientists and the technological overlap between the actors, rather than past cooperations, can best predict the resulting structure.     

Networks of inventors and the role of academia: an exploration of Italian patent data

This paper proposes a quantitative analysis of social distance between Open Science and Proprietary Technology. A few general properties of social networks within both realms are discussed, as they emerge from the new economics of science and recent applied work on “small worlds”. A new data-set on patent inventors is explored, in order to show that social networks within Proprietary Technology are much more fragmented than Open Science ones, except for science-based technologies. Two propositions are then put forward on the “open” behaviour expected from academic inventors, namely university scientists getting involved in Proprietary Technology networks by signing patents. Both propositions are confirmed by data, which show academic inventors to be more central and better connected than non-academic ones. The database and methodology produced for this paper are suggested to be relevant for the more general debate on the role of geographical and cognitive distance in university-industry technology transfer.     

快速氢原子与原子氦碰撞截面计算

应用量子力学第一玻恩近似和氢原子与氦原子的解析波函数,计算了它们弹性碰撞和各种非弹性碰撞截面。     

燃料电池

论述了燃料电池的原因,详细分析了燃料电池的特点和类型,并对其发展前景作了展望。     

松下“新画王”彩电的光栅失真校正电路

本文分析松下“新画王”彩电的光栅失真校正电路的原理,供参考。     

基于H.264的嵌入式无线视频监控系统设计

设计了一种基于H.264视频压缩标准的嵌入式无线视频监控系统,详细给出了该系统硬件和相应的软件实现方法,并针对RTP网络数据传输出现的问题给出了解决方案。实践证明,本系统设计合理,运行可靠。