全数字组态测温系统设计

本文提出了由数字温度传感器组成的组态测温系统。它可使用手持设备调试器进行现场调试，并采用OPC和组态技术进行集成。文中详细阐述了系统组成原理，组件对象模型接口技术及组态软件。在本文基础上设计的测温单元已能在实际中应用。     

履带车辆电传动系统电气机械联合制动优化控制与仿真

根据电传动研究情况,提出了电传动电气机械联合制动优化控制目标;在这个目标下,完成了电气制动控制策略优化,进行了原车机械制动系统在联合制动中制动力的分配,通过试验和仿真说明它的合理性;最后给出联合制动的仿真结果,并进行了分析。     

Influence of interfacial strength on the fracture toughness of glass-ceramic matrix composites

Nine kinds of glass-ceramic matrix composites with different compositions and interfacial strength (τ _s) were prepared. The influence of τ _s on the fracture toughness(K _1c) of composites was studied. It was discoved that, for the system no chemical reaction taking place at the interface, K _1c increased proportionally with τ _s increasing at the first stage, then decreased when τ _s reached a certain value. According to this result, a model of relationship between τ _s, thermal mismatch (Δα _r) and K _1c was built up. If a chemical reaction took place and a new phase was formed in the interface, the K _1c of composite was effected by the combination of τ _s, chemical bonding, radial interfacial stress and other factors. Project supported by the National Natural Science Foundation of China Synopsis of the first author Wang Lingsen, professor, born in 1938, current research field: special ceramic and ceramic matrix composite, etc.     

超级有限元法及高耸桁架结构的超级元列式

介绍了一种大型结构分析的新的数值方法超级有限元法。利用该方法可大大降低结构分析的计算工作量。本文推导了高耸桁架结构的超级元列式，可用于塔架等大型桁架结构的力学分析。算例说明这是一种实用的大型复杂结构分析的数值方法。     

组合四角锥单元

在分析组合网架结构主要受力特点的基础上提出了一种简化计算方案，建立了组合四角锥单元计算公式，实践表明，用这种组合四角锥单元计算组合网架总体自由度少，占用内存小，计算工作量小，精度可以满足工程要求。     

断路器200kA通断能力试验对系统电压的影响

进行大容量通断能力试验会对电力系统产生一定的影响,为此通过程序仿真模拟断路器通断能力试验的工况,进行瞬时电压跌落及电网稳定的计算分析。     

IEEE802.11MAC层性能分析及仿真

无线网络通信作为新兴的通信技术已备受人们关注。无线局域网使用无线传输媒体,可以覆盖有线网络难于涉及的范围,成为传统有线网的必要补充。IEEE802.11b是当前无线局域网的主流标准,对其性能仿真和结果分析已做了大量工作,而对尚未普及的802.11a却没有太多的性能分析。论文利用文献眼1演算法得出802.11吞吐量理论极限值,并通过ns-2软件对802.11a进行仿真。     

提高VD脱氢效率的研究

分析了影响VD脱氢效率的众多因素,采取相应的措施后,基本上满足了对氢含量有要求的钢种的生产.     

Curvilinear lattice in chiral carbon nanotubes

In this paper, the energy bands of chiral-type single-walled carbon nanotubes are studied employing a new curvilinear lattice theory and its reciprocal lattice aided by the spherical triangle theory. In this theory, the notion of a distance law is introduced as a constraint to determine the electronic characteristics of carbon nanotubes. The chiral tubes are proven to be semiconducting or metallic, depending on the diameters and helical angles of the tubes. The distance law also predicts an uncertainty for the electronic characteristics of chiral tubes due to the metallic states tightly surrounding the semiconducting states on the direct lattice, and vice versa. Results predicted by the distance law agree well with theoretical calculations of the electron density of states and published measurements.     

基于COM+组件技术的网上购物车的设计与实现

网上购物车是电子商务中一个重要的组成部分,该文采用最新的COM+组件技术有效地解决了使用一般ASP技术开发网上购物车的缺陷,并在所设计的网上购物车系统中实现了这些改进,增强了网上购物车系统的安全性和使用效率。