设备跌落分析报告

依据《放射性物质安全运输规定》（GB11806--89）、IAEA《放射性物质安全运输条例》（TS-R-1）、《ASME锅炉和压力容器规范》第Ⅲ卷第一册附录，对设备进行自由跌落分析与评定。设备跌落到地面的速度为53m／s。跌落分析采用ANSYS有限元程序LS—DYNA模块完成。LS—DYNA是以显式为主、隐式为辅的通用非线性动力分析有限元程序。跌落分析时，采用壳元模拟容器壁，其它的质量采用质量单元模拟，目标面采用三维结构实体单元模拟。     

溶胶凝胶-燃烧法合成La0.7Sr0.3MnO3阴极材料及其性能

低温合成钙钛矿单相La0.7Sr0.3MnO3粉体,以降低粒度、提高活性,已成为本领域研究的一个新方向。采用溶胶凝胶-燃烧法合成La0.7Sr0.3MnO3粉体,讨论了溶胶体系pH值和柠檬酸用量对燃烧程度及相组成的影响。利用络合理论,计算了溶胶体系的pH值对于络合物的影响。实验结果表明,当pH<3时,溶胶凝胶体系稳定存在;而当pH达到3有白色沉淀出现。燃烧完全程度随着pH值的增加和柠檬酸用量的减少而提高。晶相合成程度以柠檬酸/硝酸盐比值(j)=0.5时最为完全,随着j提高,生成微量第二相。1300℃烧结试样以j=1.5最为致密,电导率峰值达150S/cm。综合考虑相组成和性能两因素,运用此法制备La0.7Sr0.3MnO3粉体时,j以1.5为宜。     

集群整合:珠三角中小品牌提升的必由之路

单兵作战,小富即安--珠三角企业的"致命症候" 无可非议,在今日之中国经济地图中,珠三角这块土地的地位绝对是举足轻重的,由于其优越的地缘优势;制造业企业的密集程度;被誉为中国打造"世界工厂"的主力军之一.     

核电大型件90o/180o翻转机最佳翻转工艺研究

为研究核电大型件翻转机的最佳翻转工艺,并进行自身可靠性分析,基于参与研制的某重型机械集团公司核电大型件翻转机,应用理论解析法,兼顾生产效率与设备安全因素,推导了设备翻转不同类型工件时翻转机关键工位的最佳旋转角度。该结果对制定不同类型工件最佳翻转工艺,保证设备安全、高效运行具有重要意义。     

Water vapor adsorption in activated carbon modified with hydrophilic organic salts

Five different kinds of hydrophilic organic salts were used to modify commercial activated carbon in order to prepare hydrophilic carbon materials. Properties of the samples were analyzed by surface area analyzer and SEM-EDX. The hydrophilic organic salts with different properties were introduced into activated carbon and significantly affected the properties of the samples.During adsorption experiments, the water vapor adsorption amount in modified samples increases by 0.57-17.12 times in temperature range from 303 to 323 K and at relative pressure below 0.50. Water molecules combined with surface hydrophilic groups through H-bonding exhibit good thermo stability. The effects of temperature, oxygen content and properties of the hydrophilic organic salts on water vapor adsorption were studied. It is indicated that water vapor adsorption in modified samples is mainly affected by the surface oxygen content. The carboxylate radicals in the hydrophilic organic salts greatly affect the micropore structure of the modified samples, while the metal ions in them exhibit limited influence. Different adsorption capacity of modified samples can be explained with the electronegativity of elements presented by Pauling.     

Robust synchronization of uncertain complex systems with time-varying delays

Synchronization analysis and design problems for uncertain time-delayed high-order complex systems with dynamic output feedback synchronization protocols are investigated. By stating projection on the synchronization subspace and the complement synchronization subspace, synchronization problems are transformed into simultaneous stabilization problems of multiple subsystems related to eigenvalues of the Laplacian matrix of the interaction topology of a complex system. In terms of linear matrix inequalities(LMIs), sufficient conditions for robust synchronization are presented, which include only five LMI constraints.By the changing variable method, sufficient conditions for robust synchronization in terms of LMIs and matrix equalities are given,which can be checked by the cone complementarily linearization approach. The effectiveness of theoretical results is shown by numerical examples.     

非正则精确模型的布尔操作

为了加强造型系统的表达能力,实现对线框模型、曲面模型和实体模型的统一表示和操作,该文采用非正则精确模型作为几何对象表示的数据结构,并给出了相应的布尔操作实现算法,在保证效率和精确性的同时确保鲁棒性是算法的目标.作为一个特征造型系统的几何核心,该算法已经在基于NT平台的特征造型系统GS-CAD98中实现.     

基于中间盒的SDN信息服务中心策略实施架构

中间盒是一种网络管理员手动设置行为策略的设备;软件定义网络（software-defined network,SDN）的出现使得中间盒实施策略的可能性变得多样化。为改善信息服务中心的安全防护,提出一种无须管理员参与即可响应网络事件的基于SDN的动态中间策略实施架构,提出可以满足控制器与中间盒之间通信的接口。在虚拟机中实施了具有防火墙和入侵防御系统（intrusion prevention system,IPS）的中间盒原型来评估策略执行体系,验证原型获得的实验效果。结果表明,该体系结构能够在不影响网络性能的前提下动态执行中间盒策略,使网络应用程序能够正常运行。     

从中央电视台演播室看现代电视灯光系统的要求

本文针对电视灯光系统设计原则展开分析,如系统先进性、系统完整性、系统经济性等,结合现代电视灯光系统要求,内容涵盖了吊挂系统设计、灯光调控系统、灯具设计、配电箱等其他设施等内容,通过研究电视灯光系统的未来发展趋势,其目的在于加快现代电视灯光系统发展速度,增加电视节目的吸引力。