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.     

白莲河水电厂2号机组振动在线监测系统

在线监测系统是水电机组安全运行的保证，该系统能监视机组的运行情况，对尾水管压力脉动值、顶盖、机架跳动及主轴摆度值进行适时测量．为推广该成果的应用，论述了白莲河水电厂振动在线监测系统的设计方法和系统具备的功能．     

水轮发电机组故障诊断系统中几种征兆的获取

在水轮发电机组故障诊断系统中，征兆获取能力是评价故障诊断系统性能的重要指标，故障信号的特征提取影响到整个诊断过程的计算以及整个诊断系统的品质．将FFT、分形几何、相关分析、奇异谱等理论应用于故障诊断系统中征兆的获取，针对不同类型征兆采取不同的数学处理方法，并结合水轮发电机组故障诊断系统，证明了所述方法的合理性和可行性，提高了整个诊断系统的可靠性和准确性．     

集群系统的单一系统映像研究

提出了一种集群网络服务器单一系统映像的结构，即Glosim系统．该系统在操作系统内核层通过修改与IPC对象、进程信号相关的系统调用，提供全局系统映像服务，支持全局IPC对象，包括消息队列、信号量及共享内存，同时引入全局工作进程概念，透明地提供SSI服务，并与LVS和SIOS配合，实现了集群系统的高性能单一系统映像．     

内蒙产甘草中无机元素含量测定及其在临床应用中的意义

本文应用ＡＡ６７０型原子吸收分光光度计（日本岛津公司）对乌拉尔甘草中１４种金属元素的含量进行了测定，初步探讨了中药微量元素含量与临床应用的关系     

RESEARCH ON THE STRUCTURE AND THE PROPERTY OF THE HYGROSCOPIC AND PERMEABLE FABRIC FOR SPORTSWEAR

Two structure models for knitting fabric are set up according to the wet-heat transmission principle of the fabric. Four kinds of knitted fabrics for sportswear are designed and produced. The wet-heat property of these fabrics is researched.     

三参数的Stirling数和Lah数

从多项式函数［ａｔ＋ｂ↓ｄ］ｎ引入三类新数，给出了这三类新数的递归关系，计数式，恒等式，生成函数和相关性等性质以及同古典的Ｓｔｉｒｌｉｎｇ数和Ｌａｈ数的紧密联系     

东荣矿区井壁受力及破坏原因

利用钢弦式传感器,实测东荣矿区冻结压力的大小及变化规律,结果表明冻结压力随时间而增长.在此基础上,分析了井壁破坏的原因,如实际冻结压力偏大,负摩擦力的不利影响等,提出了防止井壁破坏的措施.     

钒系催化剂表面结构及活性微区模型的研究

运用ＸＲＳ，ＩＲ和ＬＲＳ等手段，对萘氧化制苯酐钒系催化剂的表面组成和结构的联合分析结果表明：催化剂表面各元素以Ｖ：Ｋ：Ｓ：Ｏ＝１：２：２：１０的比例存在；催化剂以Ｖ２Ｏ５为基本骨架，形成了ＶＯ（ＳＯ４）＾２－及Ｓ２Ｏ７＾２－的配位形式，组成了［Ｋ２ＶＯ３ＳＯ４ＳＯ３］ｎ型的表面活性微区。     

一类线性周期系统的稳定性准则

考虑一类含小参数的线性周期系统利用Ｐｏｉｎｃａｒｅ映射给出零解稳定性的判别方法。