机载无线电设备检测系统硬件设计方案     

隋秀玉 《中国科技信息》2006,(5):84-84,87

为了保障机载无线电设备的正常工作，完成对机载无线电设备进行定期检测和维修，我们提出了机载无线电设备测试系统的一种优化设计，配合软件系统以后，使大部分信号分析比较，以及对输入信号，电源控制等方面充分实现智能化，本文主要介绍了用Protel99来实现此机载无线电设备综合检测系统的硬件设计方案以及基本设计框图。  相似文献   

一种同步脱氮脱硫并回收单质硫的新工艺初探   总被引：4，自引：0，他引：4  

王爱杰  杜大仲  任南琪  刘春爽  万春黎 《中国科技信息》2005,(9)

依据脱氮硫杆菌(Thiobacillus denitrificans)在厌氧(或兼性厌氧)条件具有脱硫反硝化的生理特性,采用分离筛选的脱氮硫杆菌,通过间歇试验考察了同步脱氮脱硫技术的关键因素。试验结果证明了同步脱氮脱硫技术的可行性,提出硫氮比(S2-/NO3-)和硫化物浓度是同步脱氮脱硫技术的主要因素,两者分别控制在5/3和低于300mg/L的水平可以获得较好的脱硫和反硝化效果,在此条件下,单质硫转化率最高达94%。  相似文献   

端到端网络环境下协同办公的应用分析     

李晓芳  王从明 《科技广场》2006,(11):58-59

随着网络技术的发展,在下一代互联网技术和IPv6机制的支持下,网络的速度、质量、安全将得到加强,端到端技术将得到极大地应用。基于端到端技术的协同办公机制顺应扁平化发展趋势,使日常办公打破了时间和空间的限制,大大地提高了工作效率。  相似文献   

基于JAVA技术的移动警务系统     

罗琨  白建军 《中国科技信息》2006,(20):158-160

现代无线通讯技术的发展使得移动警务系统的实现成为了可能，本文介绍了一个完整的基于JAVA技术的移动警务系统的构建与实现，主要从系统总体设计和系统安全方面提出了完整的移动警务系统的解决方案。  相似文献   

Impacts of Globalization on E-Commerce Use and Firm Performance: A Cross-Country Investigation     

Kenneth L. Kraemer  Jennifer Gibbs  Jason Dedrick 《The Information Society》2005,21(5):323-340

This article develops and tests a model examining the relationship between firm globalization, scope of e-commerce use, and firm performance, using data from a large-scale cross-country survey of firms from three industries. We find that globalization leads to both greater scope of e-commerce use and improved performance, measured as efficiency, coordination, and market impacts. Scope of e-commerce use also leads to greater firm performance of all three types. Globalization has differential effects on B2B and B2C e-commerce, however, such that highly global firms are more likely to do B2B but less likely to do B2C. Our findings provide support for Porter's (1986) thesis that upstream business activities (namely, B2B) are more global while downstream business activities (B2C) are more local or multidomestic.  相似文献   

浅谈网格技术对B2C商务模式的促进作用     

陈新 《科技创业月刊》2006,19(8):198-199

网格作为计算机网络发展的新阶段,将对电子商务产生重大影响。在对网格技术特点及B2C商务模式进行分析的基础上,提出了网格技术在B2C商务领域内的应用及其作用。  相似文献   

基于p2p文件共享的数字版权管理模型     

何妍  井磊  邓未冰 《内蒙古科技与经济》2006,(14):39-41

近年来随着p2p(peer-to-peer)文件共享软件的广泛使用,知识产权的保护问题日益突出,由于p2p文件共享软件允许对等点之间直接的文件交换,并且较少的依赖服务器的管理,版权保护越发困难。本文首先分析了p2p网络下知识产权保护面临的困难,以及目前数字版权管理系统DRM(DigitalRightsManagement)系统面临的挑战,提出了两种适用于p2p文件共享的数字版权管理方案,并分析和讨论了目前存在的问题,最后指出了进一步的研究方向。  相似文献   

Stability and dissipative analysis for a class of stochastic system with time-delay     

Hao Zhang  Huaicheng Yan 《Journal of The Franklin Institute》2010,347(5):882-3355

This paper deals with the stability and dissipative problem of a class of stochastic hybrid system. The system under study involves Markovian jump, impulsive effects and time delay, which are often encountered in practice and are the sources of instability. Our attention is focused on analysis of whether the stochastic hybrid system with time-delay is stochastically asymptotically stable and strictly (Q, S, R) dissipative. By introducing an extra artificial time instance, the equivalent system is obtained and the sufficient conditions are derived by using linear matrix inequality (LMI) techniques. The main results of this paper unify the existing results on H_∞ control.  相似文献   

藤麻(荨麻科)的一个新异名     

林祁  陈家瑞 《中国科学院研究生院学报》2005,1(1):79-81

根据对Elatostema gagnepainianum H. Schröter模式材料的研究,为它指定了后选模式,并将其处理为藤麻Procris crenata C. B. Robinson的新异名。  相似文献   

R&D co-operation and innovation a microeconometric study on French firms     

S. Negassi 《Research Policy》2004,33(3):365-384

The scope of this paper is to report new empirical evidence on the determinants of R&D co-operation. Indeed, the literature on the capabilities of firms emphasises the role of knowledge in the performance and evolution of firms who use knowledge developed in others to build their own knowledge capital. R&D co-operation between firms is one of the many strategies by which this knowledge may be transmitted. Several theoretical models have stressed that R&D co-operation is more likely when the level of spillovers is high. While this supposition is used in many theoretical models, it has rarely been tested before. Our results do not lend strong support to this intuition. Indeed, our spillover variables (national pure spillovers, national rent spillovers and imports of machine tools), which were supposed to match the theoretical notion of spillovers used in these theoretical models have a positive but not a significant role when explaining R&D co-operation. The R&D co-operation increases with size and with R&D intensity, but not with market share. It also increases with the budget spent on paying license fees and on acquiring patents and labour from foreign firms. In this study, we also analyse the determinants of innovation. In more precise terms, we compare the effects of R&D co-operation to those played by traditional internal factors and those exerted by external, pure and rent spillovers on the innovation capacity of the firms. Our results show that the commercial success of innovations of French firms depends mainly on size, market share, R&D intensity and human capital. Inward FDI from industrialised countries exerts a positive and significant effect. The finding highlights the important role of the absorptive capacity of firms. Spillover measurements, such as the acquisition of machine tools, foreign patents, licenses, and technological opportunities have a positive impact on innovation.  相似文献