机载相控阵天线辐射方向图的分析

采用一致性几何绕射理论分析了某型预警机机体对其上安装的大型相控阵天线辐射方向图的影响，计算了天线经机体散射后的场，优化了大型相控阵天线安装的最佳位置，为天线装机后辐射性能预测与布局优化提供了理论依据。     

济阳坳陷陡坡带断裂控砂模式

通过对济阳坳陷陡坡带大量地质、地震及测井资料的分析，研究不各种类型同生断裂对地层沉积、储集体发育的控制作用，总结了多种断裂控砂模式，指出了不同类型、不同规模的储集体赋存的有利场所。     

电脑提花圆机图案的设计与开发

应用当前景流行的图形设计软件Coredraw9.0和Photoshop5.0，设计针织面料T恤花型，进一步利用SCC4F-548型电脑提花圆机相配套的图形设计软件Aupaint处理，生成提花花型图案，为夏季T恤花型图案设计提供了一条简便快捷的设计方法和新的设计思路。     

数字化制模新技术

数字化制模技术是将三维CAD模型直接转化成为铸造用模的新技术。文中介绍了华中科技大学开发的HRP系列数字化制模技术的原理及制模工艺。与传统制模方法相比 ,具有制模速度快、精度高、质量好、价格便宜等优点。文中还以制作轿车制动器卡钳体模样、搅拌叶片模样、蜗壳凸样为例说明了运用数字化制模新技术的优点     

应用遗传神经网络研究低渗透储层成岩储集相—以胜利渤南油田三区沙河街组为例

以渤南油田三区沙河街组为例,应用遗传人工神经网络模式识别方法,开展了低渗透储层成岩储集相的研究。该工作是在储集层沉积相、成岩作用研究的基础上,选用流动层带指标、孔隙度、渗透率、粒度中值、泥质含量、孔喉半径均值和变异系数等7项参数,采用神经网络模式识别方法,通过建立遗传神经网络的学习及预测模型,对渤南油田三区沙河街组进行了成岩储集相识别,识别出4类成岩储集相:不稳定组分强溶解次生孔隙成岩储集相、碳酸盐胶结物溶解次生孔隙成岩储集相、强压实强胶结残余粒间孔成岩储集相和极强压实强胶结致密成岩储集相。Ⅰ类储集相的储集性能最好,Ⅳ类最差,为非储层或差储层。     

美国国家公园申报准则及审议程序

本文所讲述的是美国国家公园服务中心在评估申请提案、制定审查方案过程中所应用的各种标准和准则 ,同时也列出了一些认识、保护未列入国家公园体系中其他重要资源的途径和方法。     

神经网络在缺陷识别中的应用

为了准确、快速地进行缺陷识别，介绍了一种新型的前馈神经网络模型，即径向基概率神经网络。与以往的算法相比，该方法具有分类识别精度高且速度快的优点。仿真获得了很好的结果。     

EXPERIMENTAL AND NUMERICAL INVESTIGATIONS ON HORIZONTAL OIL-GAS FLOW

Experiments were carried out to investigate the characteristics of oil-gas flow in a horizontal pipe on a large scale (with the inner diameter D = 125 mm). With the experimental data, the flow patterns were presented. Through the analyses for the flow regime transition, it was found that there was a critical superficial velocity of liquid phase for the flow regime transiting from stratified flow to slug flow. The slug flow could not occur until the superficial velocity of liquid phase was higher than the critical velocity. For the flow pattern transiting from stratified to slug flow, the transmitting velocity of gas phase decreases with the augmentation of superficial velocity of liquid phase. On the basis of the experiments, numerical simulations of different flow patterns and their transitions were performed with the use of the Volume Of Fluid (VOF) technique. The results of the computations are shown to match well with the measured data in the experiments.     

Sandia National Laboratories Validation Workshop: Structural dynamics application

This article specifies a virtual structural dynamic subsystem and some systems, as well as mathematical models that approximately simulate them. The purpose is to define a setting for model validations conceived by participants in the Sandia National Laboratories Validation Workshop. Some broad guidelines for the model validations are set, as well as a regulatory requirement to be satisfied by the target system. Participants are directed to present techniques for subsystem model validation, to analytically predict whether or not the regulatory requirement will be met, and to estimate the likelihood of accuracy of the prediction.     

影响私营企业健康发展的因素及对策

指出私营企业是我国国民经济中的一支生力军。它起步晚、基础差,但发展速度快,具有顽强的生命力,已成为推动我国经济持续、快速、健康发展的重要力量。在增加财政税收、繁荣经济、增加就业等方面,亦作出了一定的贡献。笔者在文中分析了影响私营企业健康发展的因素,并提出了一些促进私营企业健康发展的对策。