开放性尘源粉尘运动轨迹的数值计算

在对粉尘颗粒在大气中受力状况进行分析的基础上 ,采用颗粒随机轨道模型对尘源表面的粉尘在大气中的运动轨迹进行了数值计算 ,再现了野外现场观测的现象 ,从而证明了数值计算的可靠性 .利用ParticleSourceinCell算法 ,计算了由开放性粉尘造成的大气含尘质量分数 ,为定量预测露天矿粉堆料对环境造成的污染提供了依据 .     

煤矿井下开掘工作面双风机双电源自动切换的实现

为了进一步保证矿井安全生产，减少井下掘进工作面无计划停风，采用双风机双电源自动切换对掘进工作面供风。介绍了双风机双电源及自动切换通风系统的组成和功能，阐述了自动切换装置的设计思路和工作原理以及日常运行和维护的要点。     

利用Python Remote Objects技术实现分布式对象应用系统

讨论了如何利用Python Remote Objects技术来设计与实现分布式对象应用系统。详细阐述了其技术特点及系统架构，并结合实例重点探讨了基于Python Remote Objects的分布式对象应用系统的设计思路与实现方法。通过深入研究，充分发挥其具有开放源代码的特性，不仅为分布式对象技术系统的基础设计与应用开发提供了参考，同时也对我们开发拥有自主知识产权的分布式对象技术系统提供了借鉴。     

分布式数据库多副本封锁解决方法

数据的安全性、完整性、并发控制和数据库恢复是数据控制所要处理的主要问题．本文从数据控制的角度介绍了分布式数据库并发控制的基本方法。     

中断实验的设计及外部中断源扩展的实现

针对授课过程中学生对中断优先权以及中断屏蔽等概念不理解的情况设计了一款简单实用的由8031组成的中断实验系统．通过该实验，可以直观地看到中断、中断优先权、中断屏蔽、外中断源扩展的过程，使学生较容易地理解掌握单片机控制系统中中断的处理方法，提高了实验效果．     

个性化网络教学模型及实现策略研究

首先分析网络教学的理论模型，结合代理技术与分布对象计算技术，给出一个基于建构主义学习理论的个性化网络教学模型，论述个性化网络教学实现策略及实现参考模型，该模型基于知识应用模式及其建构的认知结构以及在此基础上的互动教学，支持分布式个性化网络教学．最后给出相应的样例及其分析．     

Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period

Aerosol samples for PM2.5 were collected in Beijing for 38 consecutive days from March to April 2001 using an IMPROVE Sampler. Concentrations of 20 elements in PM2.5 were determined using a PIXE method. Results show that the average mineral dust concentration of PM2.5 was 14.6 Ilg/m3 during the observation period. On the sand-dust event days of March 21 and April 10, dust PM2.5 mass concentrations were 62.4 and 54.1 μg/m^3, respectively.These demonstrate that fine particle pollution by dust event in Beijing was very severe. The enrichment factors of S and Cu reached minimums on the dusty days and were high on the non-dusty days. It is considered that enrichment factors of elements in PM2.5, which are associated with human activities, can probably provide an effective method to distinguish local sources from external sources of dust. Factor analysis on the chemical composition in PM2.5 shows that sources of crustal matters, anthropogenic emission, and oil combustion contributed to PM2.5 levels in air in the springtime of 2001 in Beijing.     

历山地区野生果树植物资源及开发利用

历山位于山西东南部的沁水、阳城、垣曲和翼城四县交界处．经几年在此处的野外考察，得知这里的野生果树资源较为丰富，至少有31属91种．其中有不少种类不但味美姿丽、营养价值高，而且适应性强，容易引种驯化，便于大面积推广．对于有效地开发和利用这些资源，促进本地经济的发展，具有一定的参考价值．     

A UDDI Based Shared Resources Management Mechanism in Virtual Enetrprises .

Service and information resources are two kinds of major shared resources in virtual enterprises, where, service resources include third party‘s service resources and enterprise‘s legacy service resources, and information resources include database resources and file resources. Since service and information resources have distributed, autonomic, remotely bound as well as some other similar characteristics, an implementation mechanism on managing shared resources based on UDDI are presented. XML instances are used to describe resources authorization information, WSDLbased special XML instance represents information resource metadata, and these XML instancesare referenced by tModel for realizing the purpose of managing shared resources metadata based on UDDI.     

Apache在校园网络中的应用研究

Apache在Internet中的WWW服务器领域，占有无可争议的领先地位．讨论了Apache服务器的实现原理，介绍了Apache的安装和配置过程．并结合实例就Apache在校园网络中的一些常见应用进行了分析，包括为用户提供个人主页服务和虚拟主机的服务等。