网格环境下基于HLA的分布交互仿真动态交互研究

基于HLA开发的分布交互仿真缺乏灵活性，不支持动态资源分配。网格服务是开发基于网络的分布交互仿真的另一途径，但只应用网格服务开发分布交互仿真，开发者必须自己创建通信机制来协调仿真执行。本文提出了一个动态交互框架，将基于HLA的分布交互仿真建立在网格服务的基础之上，来克服两者所存在的问题并发挥各自的优点，实现仿真资源的动态分配、动态状态监控及任务动态迁移。文中详细地阐述了框架的构成、框架关键服务构建的设计和实现、各种网格服务的机制及服务接口，并给出实例进行验证。     

对海超视距导弹攻击方法分析

在对六种超视距目标定位法进行了评估与分析后，着重论述了对海超视距导弹攻击中目标定位的战术态热要求、导弹的射击阵位、导弹射击通道的组织与射击方式的选择，最后对超视距志弹攻击中存在的问题及提高导弹攻击效果的措施进行了论述。     

新世纪关于微处理器及其相关技术的新动态

以硅片微处理器为核心的电子计算机要走到尽头了吗？光子计算机、生物计算机、量子计算机,哪个将在未来世界称雄？嵌入式计算机系统,包括微控制器、嵌入式微处理器、工控机将如何向前发展？“蓝牙”技术及其应用何以进展如此神速？新千年伊始,本文略作综述,以飨读者。     

Bulk metallic glasses formed by alloying the Cu_6Zr_5 cluster

The bulk metallic glass formation in the Cu-Zr-M ternary systems by alloying of a binary basic Cu6Zr5 cluster was inves- tigated, where M stands for Sn, Mo, Ta, Nb, Ag, Al and Ti. The Cu6Zr5 cluster is a capped Archimedean antiprism that characterizes the local structure of the Cu10Zr7 crystalline phase. This cluster composition almost superposes with Cu-Zr eutectic Cu0.56Zr0.44. A se- ries of alloys along the cluster line (Cu6Zr5)1-xMx were examined for their glass forming abilities. Alloy rods with a diameter of 3 mm were prepared by copper mould suction casting method and analyzed by XRD and thermal analysis. The Cu-Zr based bulk metallic glasses were discovered with minor Nb, Sn, Mo, Ta additions (≤2at%) and Al, Ti, Ag (8at%≤concentration≤9at%). The alloying mechanism was discussed in the light of atomic size, cluster-linking structure and electron concentration factors.     

NONSTRUCTED GRID MESH FINITE VOLUME METHOD AND APPLICATION

Finite Volume Method (FVM) which can solve fluid problems effectively is used in this paper. Gauss theorem is used to transfer volume integration to area integration , by which the relation formula of the nodes around each element is founded based on the constancy of the flux into and out of the element. With that the discrete equations are obtained. This method with free cubic element is applied in 3D seepage and tidal flow problems. From the practice it can be found that seepage flux is more accurate than FEM and FVM also has the advantages of good stability, convenience of solving. easy programming, less computing time and storage.     

NUMERICAL ANALYSIS OF WATER SURFACE PROFILE IN RIVER AFFECTED BY TIDE FLUCTUATION

A Finite Difference Method with four points weighted implicit scheme and Newton-Raphson iteration method are introduced to complete the flood routing in the tidal river. The problems related to normalization of cross-sectional area and optimization of weighting factor α are discussed and α = 0. 5 - 0. 7 is suggested. With such a α, high accuracy, stable and convergence results and flexible time step will be expected. The computational example of a tidal river in Liaoning Province shows the good agreement with the measuring data on prototype.     

The Use of Image Analysis to Simulate Growth Kinetics of Ferrite by Carbon Diffusion in SG Cast Iron

1.IntroductionThe use of the Quantimet 900 imageanalysis system to simulate the growth kine-tics of ferrite by carbon diffusion inspheroidal graphite(SG)cast iron has beendiscussed[1].The results obtained from theQ900 agreed qualitatively with experiment.     

液压CAD图形库的组建与管理

本文为液压元件及系统计算机辅助设计(CAD的一个)子课题的研究报告。它是利用微机与APPLEⅡ兼容的紫金Ⅱ高分辨率作图功能,组建了图形库。并采用BASIC语言编制管理程序,形成一个绘图系统用以组织人机对话,交互式自动生成液压原理图及其存贮。     

特大型椭圆封头的分瓣计算

对12m近似椭圆封头实施合理的分瓣，创造了足球瓣顶圆的新方法，并进行了瓣片尺寸计算。     

我国软件产业发展需要大举措

目前我国软件产业规模小、人员分散、抗风险能力低下，处于发展的初级阶段，但人才优势与发展册时并存。面对挑战，必须有相应的大举措，如联合、重组、兼并，如多方筹资、加大投入，如强化管理、政策扶植等等，最终做出正确选择。