基于C/S体系结构的集装箱MIS系统设计

该文根据集装箱管理的实际需要,结合网络、数据库、计算机、优化等技术,提出并实现了基于C/S体系结构的集装箱管理信息系统。在此系统的设计与实现过程中,较为详细地分析了系统功能结构、数据库优化、权限管理、ODBC等关键技术,并结合实际对有关设计工作进行了说明。     

FDDI网络适配器ODI驱动程序的原理与实现

本文首先简要介绍了开放数据链路接口ＯＤＩ的结构模型和基本原理，并在此 论述了Ｎｏｖｅｌｌ网中ＦＤＤＩ网络适配器ＯＤＩ驱动程序的实现技术。     

R6P电池质量事故分析

作者通过解决R6p电池发生的质量事故,阐述了电池质量恶化的形成原因、表现现象并指出了解决电池质量问题的方法。     

UNIX——一个功能强大的开放式操作系统

本文概述了ＵＮＩＸ系统的产生和发展，探析其基本结构和主要特点；阐述了其应用及发展趋势。     

数据可视化开发工具Data Viz及应用

介绍TGS公司的OpenInventor的高级数据可视化组件DataViz,及其在数据可视化方面的应用.说明DataViz结构及应用要点,并举例说明了用DataViz开发应用程序的基本格式.     

开敞式叉筒网壳风场数值模拟与受力分析

针对国家现行<建筑结构荷载规范>缺乏复杂形体结构净风压体型系数的相关规范的问题,应用标准k-ε紊流封闭模型,采用数值风洞技术对开敞式叉筒网壳在多角度风场作用下结构表面的风压分布进行了数值模拟,获得了该类网壳的净风压体型系数.研究表明采用数值风洞技术对复杂形体结构的流场进行计算机数值模拟的方法是可行的,这为风压分布及大小取值提供了一种非实验性的、低成本的取值方法.力学分析结果表明,风对开敞式叉筒网壳的最大负压主要集中在脊线附近的边缘部位,脊线附近边缘以及谷线交叉拱是结构设计的重点.     

户外126kV敞开式组合电器的结构和功能--变电站设备选型的良好决策

ZCW□-126型户外敞开式组合电器把断路器、互感器、隔离开关，接地开关及避雷器等主要高压电器件合理地组合在一起，配置常规的变电站、杆塔，硬母线后组成了变电站设备。介绍了该组合电器的结构，参数及功能。     

One-Dimensional Numerical Model for Nonuniform Sediment Transport under Unsteady Flows in Channel Networks

In this study, the proposed one-dimensional model simulates the nonequilibrium transport of nonuniform total load under unsteady flow conditions in dendritic channel networks with hydraulic structures. The equations of sediment transport, bed changes, and bed-material sorting are solved in a coupling procedure with a direct solution technique, while still decoupled from the flow model. This coupled model for sediment calculation is more stable and less likely to produce negative values for bed-material gradation than the traditional fully decoupled model. The sediment transport capacity is calculated by one of four formulas, which have taken into consideration the hiding and exposure mechanism of nonuniform sediment transport. The fluvial erosion at bank toes and the mass failure of banks are simulated to complement the modeling of bed morphological changes in channels. The tests in several cases show that the present model is capable of predicting sediment transport, bed changes, and bed-material sorting in various situations, with reasonable accuracy and reliability.     

Velocity Distribution in the Roughness Layer of Rough-Bed Flows

Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which share some common features. The suggested models for velocity distribution in the near-bed region are: (1) Constant velocity; (2) exponential velocity distribution; and (3) linear velocity distribution. The measured velocity distributions may be approximated by a single model or by a combination of models depending on roughness geometry and flow conditions. The validity of these models for velocity distribution is supported by laboratory data.