机载电缆作战损毁后智能化诊断系统

从技战术实际需要出发,给出了某型飞机作战损毁后机载电缆的智能化诊断系统的硬件结构框图。根据硬件系统模拟开关组件的原理,定义了电缆的连接矩阵、测量矩阵以及断口的映像矩阵运算,给出了断头查找的算法。计算表明,系统可在20 min内完成一个循环的断头查找并给出故障定位。     

光存储材料CaS∶Eu,Sm的正交实验制备及表征

CaS∶Eu,Sm材料在光存储、光探测领域具有广阔应用前景,但制备过程中影响其发光性能的因素较多,彼此又有交互作用,不易获得最佳工艺参数。本文采用高温固相反应法,通过正交实验设计系统研究了灼烧温度、灼烧时间、稀土掺杂浓度、助溶剂用量对CaS：Eu,Sm发光性能影响的主次关系,经正交分析和验证实验确定了最佳工艺参数应为：Eu∶Sm∶Ca mol%=0.3∶0.3∶99.4%,1100℃灼烧0.5h,助熔剂LiF用量为7%。采用X射线粉末衍射仪、荧光分光光度计（耦合1064nm激光激励源）对样品的物相及发光性能进行了测试与表征。     

面向媒体的系统传输网络连接管理策略

为了适应动态变化的面向媒体的系统传输(MOST)网络环境,提出了一种基于MOST网络管理的连接管理策略。该策略动态更新中心注册表,管理MOST网络中数据源与目的端口,并实现了多同步信道连接的建立、释放与切换等操作。在采用MOST50网络节点搭建的环型网络中,通过MOST网络分析器OptoLyzer的功能性验证表明,该策略有效提高了MOST网络带宽的利用率。     

A combined dislocation—cohesive zone model for fracture in a confined ductile layer

The collective dislocation behavior near a crack tip in a ductile layer sandwiched between two brittle solids is analyzed via two-dimensional dislocation dynamics (DD) simulations that incorporate a cohesive zone (CZ) model. The cohesive crack tip is treated as part of a much larger finite crack confined in the ductile layer. The underlying boundary value problem is formulated with a set of boundary integral equations and numerically evaluated with a collocation method. The fracture energy of the layered composite material is shown to be strongly correlated with the layer thickness and is directly influenced by the cohesive strength of the ductile layer (Hsia KJ et al. (1994) J Mech Phys Solids 6 877–896).     

Base Pressure Measurements under a Scale Model Stockpile

The ability of a granular bulk material to transmit internal shear stress is a fundamental property that is often overlooked or underestimated, yet it is this ability that allows many observed physical phenomena to occur. One such area that continues to be a focus for numerical, theoreticals and experimental researchers is the pressure that a stockpile of granular material places on the supporting surface. While appearing to be a simple problem, the ability of granular materials to transmit shear stress makes this an extremely complex problem. This article presents high-quality data collected under a 2 m high stockpile and full details of the experimental facilities used in the collection of the data.

The work presented is of significant value, having a much greater scale than previous studies (Jotaki & Moriyama, 1979; Lee & Herington, 1971; Smid & Novosad, 1981), and the deliberate inclusion of a central reclaim channel offers insight into stress changes during gravity reclaim and refilling. The results of this work have shown that the so-called 'M' pressure does exist under larger stockpiles both with and without reclaim hoppers; of more significance is the reemergence of the M pressure upon refilling of an emptied stockpile. This clearly illustrates that the M pressure is a robust and natural pressure distribution for a conical stockpile.     

蒙特卡罗方法在中子活化在线分析系统设计中的应用

选取重水、石墨、聚乙烯等6种慢化材料，利用MCNP程序对不同的慢化材料进行模拟计算分析。计算结果表明，中子活化在线分析系统的最优化慢化材料为聚乙烯。实验测定了以聚乙烯为慢化材料的中子活化分析系统的热中子注量率随源到引出孔之间的距离以及探测器处于不同位置时的分布关系，为下一步进行中子活化在线分析研究提供了依据。     

基于MVC模型的远程教材管理系统的设计与实现

基于Web的远程教学是现代继续教育的发展方向,实现教材管理的科学化、简单化、条理化,有效提高工作效率,是现代远程教育管理的一项重要任务,然而用传统开发技术如ASP,PHP则存在程序可重用程度低、可扩展性差、维护工作烦琐等缺点。MVC设计模式是目前Web开发中一种非常先进的设计思想,文中阐述了运用MVC模型设计开发教材管理系统。试用系统证明,基于MVC模型的远程教材管理系统具有良好的运行效果,并且易于维护。     

低能X射线吸收法测量泡沫材料密度

文章介绍为适应惯性约束聚变(ICF)靶材料研究而发展的一种密度测量方法。通过测量X射线经靶材料吸收前后的强度变化,可较为精确地计算出待测样品的密度。用于泡沫材料密度测量的X射线源是特制的激发源。