浅谈VRVII型空调在设计中的具体应用

结合VRVII型空调的特点,论述了此种空调形式在工程设计中的选型要点,并对各种VRVII型空调的新风处理方式进行了详细的分析,对不同类型的建筑提出了相应的解决办法．     

Variational approach to the analysis of steady‐state thermo‐elastic wear regimes

A transient wear process on frictional interface of two thermo‐elastic bodies in a relative steady sliding motion induces shape evolution of contact interface and tends to a steady state for which the wear process occurs at fixed contact stress and strain distribution. The temperature field generated by frictional and wear dissipation on the contact surface is assumed to reach a steady state. This state is assumed to correspond to minimum of the wear dissipation power and the temperature field corresponds to maximum of the heat entropy production. The stationarity conditions of the response functionals provide the contact pressure distribution and the corresponding temperature field. The present approach extends the authors previous analyses of optimal or steady‐state contact shapes by accounting for coupled wear and thermal distortion effects. The wear rule is assumed as a non‐linear relation of wear rate to shear stress and relative sliding velocity. The analysis of disk and drum brakes is presented with account for thermal distortion effect. It is shown that the contact shape in a steady thermo‐elastic state essentially differs from that specified for mechanical loading with neglect of thermal effects. The thermal instability regimes are not considered in the paper. Copyright © 2009 John Wiley & Sons, Ltd.     

面向下一代互联网的网络漏洞扫描系统研究

随着下一代互联网应用的推广普及,面向下一代互联网的网络漏洞扫描系统的研究工作得到广泛关注。本文介绍了下一代互联网相关安全背景情况,分析了下一代互联网协议的安全漏洞情况,提出了面向下一代互联网的网络漏洞扫描系统的新需求．探讨了面向下一代互联网的网络漏洞扫描系统实现过程中的关键技术和应用部署模式。     

添加电解液法生产PS版铝板基用铸轧坯料的工艺研究

通过试验确定在铸轧生产中适当添加电解铝液量,生产出高品质的PS版铝板基用铸轧坯料,对添加电解铝液的PS版铝板基用铸轧坯料生产过程中的工艺控制要点进行总结。     

performance Evaluation of IPv4/IPv6 Networks for Ubiquitous Home-Care Service

Because of rapid development in network technology,Internet usage has become widespread.It allows users with sensing devices to obtain medical data for healthcare,such as physiological signals,voice,and video streams from telemedicine systems,and to send the healthcare data to back-end database systems,creating a ubiquitous healthcare environment.However,this environment requires a widespread and suitable network.IPv6(Internet protocol version 6) is the next-generation Internet protocol that will be the protocol of future networks;it improves many shortcomings of IPv4.In this paper,we propose an IPv6/IPv4 U-home-care test system and analyze the network’s parameters though a series of tests by adjusting network parameters to find the optimal design for applications in the IPv6/IPv4 U-home-care service so as to assure good performance and high quality.     

一种适合无线环境的IPv6头部压缩方法

头部压缩可以提高链路传输效率,但现有压缩方法基于差分编码方式,压缩效率易受丢包影响,在误码率高的无线链路上反而会降低传输效率。为此,提出一种新的IPv6头部压缩方法SBHC。主要思想是利用IPv6头部变化少的特点,采用基于替换的方式实现压缩行为,克服了差分编码方式存在的弊端。性能测试结果表明,SBHC压缩方法可以有效提高无线链路的传输效率。     

多版本数据仓库的查询优化设计

多版本数据仓库中,不同数据仓库版本的维度实例可以共享存储。直接建立维度表与事实表的位图连接索引会产生大量无用的索引项,影响查询效率。给出了一种数据仓库版本的形式定义和维度实例的共享存储方式,并在此基础上设计了查询优化算法DWVOQ,通过建立维度实例的版本视图及其与事实实例的连接索引来降低索引空间代价,提高索引查询效率。     

医药行业新版GMP实行后的节能技术探讨

针对新版GMP关注点,分析目前医药厂房能耗通病并提出解决方案。     

MIPv6与FMIPv6切换性能分析与优化

随着移动通信的迅速发展,越来越多的移动设备提出了接入互联网的需求。移动IPv6的切换性能是保证移动互联网服务质量的重要因素之一。该文描述了MIPv6及FMIPv6的切换流程,分析了MIPv6及FMIPv6的切换性能及其切换过程中存在的问题,提出和归纳了一些优化思想和改进方法。     

中小型金属工件在线检测系统的设计

随着机器视觉技术的快速发展,利用图像处理技术对工件进行在线实时检测的方法近年来得到广泛的应用和发展。为了解决工件离线人工检测效率低、精度差的问题,设计了包括上料模块、图像采集处理模块、零件传送模块、筛选模块和控制模块的基于机器视觉的工件在线检测剔除系统。系统运用PLC可编程逻辑控制器作为工业控制器,机器视觉和图像处理作为检测方法,提高了工件检测的产品品质、生产效率和自动化程度,该机器视觉检测系统可以通过改变程序的方法,运用和推广到其他表面品质检测的行业中。