GIS在网络设备管理中的应用

众多设备制造商的不同类型的通信设备服务于通信网，由于每个设备没有位置信息，因而无法知道相应设备的位置和覆盖范围，势必带来设备管理的困难。解决方法是将地理信息系统（GIS）应用于网络设备管理系统中。GIS支持地理空间数据的采集、存储和显示，并能将地理空间数据与相关参考数据关联以提供信息壹询与分析。文章提出了一种结合了GIS技术的网络设备管理系统，并给出了相应的系统框架、系统模块、系统管理流程，认为该方案能更有效地管理和维护网络设备。     

广电宽带设备集中供电初探

结合有线电视集中供电特点，提出了一种解决广电宽带系统设备供电的新途径。     

支持和保护国内通信设备制造业

加入ＷＴＯ后,直面国外同行的强大实力,国内电信设备制造商将遇到空前挑战。我们要利用ＷＴＯ的各项保护条款对国内通信企业实行合法合理的支持和保护。同时,还要发挥政府作用,将电信设备制造业纳入“特定工业”,通过财政拨款、银行贷款、减免税和出口鼓励等政策实行行业扶持,借助宏观政策、关税结构调节、打击走私等手段进行适度和合理的市场保护．     

激光合成新型线性NTC热敏电阻材料

本文采用CO2激光器作热源合成了Al2O3-WO3系热敏电阻材料,该材料具有负的温度系数,在一定温区内阻温特性呈线性变化。并对材料的导电机理进行了初步探讨。     

一种面向通信设备的嵌入式软件平台

文章介绍了一种应用于通信设备中的嵌入式软件平台,在给出了嵌入式软件平台的体系架构的基础上,从嵌入式实时操作系统、符合通信行业需求的定制组件和中间件、通信应用软件的集成开发环境3个层面对嵌入式软件平台的关键技术和特点进行了描述,并分析了嵌入式软件平台的经济价值和社会效益.     

The Measurement of the Dispersion of Pd/C Catalysts

A 10 w/o Pd/C catalyst from Johnson Matthey has been examined by three different techniques: chemisorption, line broadening of X-ray diffraction, and TEM (transmission electron microscopy) to investigate the size of the palladium crystallites. The dispersion of this catalyst was determined to be 20%. Among these techniques, the X-ray diffraction was found to be the most convenient method. Through this method, the dispersion of Pd was found to decrease on catalyzing hydroxylamine reactions at 330 K. The deactivation of Pd/C for these reactions was correlated to the sintering of palladium. H₂ chemisorption at 373 K was found to be a good way to accurately measure the number of active palladium sites in the Pd/C catalysts.     

Microstructural prototyping of ceramics by kinetic engineering: applications of spark plasma sintering

The significance of kinetics on the development of microstructures in connection with sintering of ceramics is well recognized. In practice, however, it still remains a challenge to prepare designed microstructures via engineering the sintering kinetics because of an insufficient understanding of the different operative mechanisms that are in many cases overlapping. In this article the kinetic issues involved in sintering are described and discussed with respect to their potential for prototyping microstructures that yield desired properties. By exploiting and mastering the differences present in the kinetics of grain sliding, densification, chemical reactions, and grain growth, respectively, we have established processing principles for producing bulk ceramics with microstructures consisting of nano-sized grains, aligned grains, and/or non-equilibrium-phase constitutions, and for achieving radically improved superplasticity in brittle ceramics. Although the studies quoted in this article were mainly carried out by spark plasma sintering, more general implications of them are expected, including efficient particle sliding, deformation-induced dynamic ripening, superplastic deformation-induced dynamic ripening, and non-equilibrium integration.     

200 m2演播室的建声设计和设备配置

从演播室的基本结构出发，分析其声学特性，结合专业实践需求，在节约、实用的前提下进行设备的配置。从而设计出既符合专业设计标准又满足教学需要的演播室。     

B位取代对钛酸锌相结构及介电性能的影响

通过固相烧结法结合半化学法制备了ZnO-(1-x)TiO2-xSnO2(x=0.04~0.20)陶瓷,掺杂1.0%3V2O5(质量分数)-B2O3降低陶瓷的烧结温度,研究了B位取代对ZnTiO3相结构及介电性能的影响。结果表明,Sn的加入促进了六方相分解,形成了立方尖晶石结构的固溶相Zn2(Ti1-xSnx)O4;随烧结温度升高,Sn的固溶量增加,900℃时,最大固溶量为0.08 mol。900℃烧结试样,随x增加,其介电常数ε先增大后减小,而介电损耗tanδ恰好相反,先减小后增大,当x=0.12时,得到ε的最大值(ε=29)和tanδ的最小值(tanδ=9.86×10-5)。900℃烧结的具有优良介电性能的ZnO-(1-x)TiO2-xSnO2(x=0.04~0.20)陶瓷有很好的实际应用前景。     

真空控制系统的发展现状

主要介绍真空应用设备中可视化界面控制的发展概况.回顾了真空控制系统的发展历程,以几个典型界面为例,介绍了国内外有关真空设备可视化界面控制发展概况,分析了其控制特点,并对真空应用系统可视化控制界面的未来发展提出了自己的看法.