GIS下无公害农产品产地空气和灌溉水环境预警区划分

将环境质量评价学、GIS(地理信息系统)和编程技术相结合，拟定了无公害农产品产地空气和灌溉水环境条件预警区划分的技术路线。基于GIS建立了自贡市部分地区预警区图层数据库，并通过嵌套编程对废气和废水浓度衰减预测和综合指数计算，矢量化地形图的缓冲分析圈定预警区范围，GIS区域求并，生成预警区成图。不满足产地空气和灌溉水环境条件的预警范围分别为75．93km^2和89.85km^2，综合影响范围129．99km^2。     

The terrestrial NPP simulations in China since Last Glacial Maximum

Based on Atmosphere-Vegetation Interaction Model （AVIM）, the magnitude and spatial distribution of terrestrial net primary productivity （NPP） in China is simulated during three different geological eras, Last Glacial Maximum （LGM）, Mid-Holocene （MH） and the present. The simulation shows that the glacial-interglacial variation of East Asian summer monsoon in China is the key factor affectfng the NPP change. During the three eras, mean NPPs are 208 g/m^2·a, 409 g/m^2·a, and 355 g/m^2·a. The total NPPs are 2.05 Pg/a, 3.89 Pg/a and 3.33 Pg/a, respectively. The terrestrial NPP in China during warm-humid climate is larger than that during cold-arid eras, and the correlation analysis between NPP and climate factors suggests that temperature is the primary factor affecting the terrestrial NPP during 21 kaBP （LGM）, and for 6 kaBP （MH） and the present the primary factor is precipitation.     

Application of microfluidic chip to realize controllable pH gradient

A kind of PH gradient microfluidic chips through soft-lithography microfabrication for isoelectric focusing (IEF) and high performance liquid chromatography (HPLC) is introduced here. These pH gradient chips have the advantages such as easy fabrication, controllable pH range and precision, isoelectric focusing and separation at the same time, low voltage for isoelectric focusing, and time stable pH gradient. This method has potential application to sample preparation, separation and analysis of microfluidic chips.     

Simulation of a compartment fire using a zone model

This paper presents the zone modeling analysis of a single compartment flashover fire. Two criteria are applied in the model to judge the onset of ignition for different combustibles. By calculating the total received energy through radiation or the surface temperature of the combustible, the fire growth can be quantitatively determined. The improved zone fire model shows the influence of different combustibles upon the fire growth. This model is better than the traditional zone model because the common criteria of flashover, i.e. an upper layer temperature of 600℃ and the heat radiation intensity received by the floor of 20 kW/m^2, have not been applied in it.     

七号信令集中监测系统的接入和数据整合处理

为了保证七号信令网的正常高效运行，七号信令集中监测系统已成为对七号信令网进行集中监测和管理的重要工具。主要介绍了七号信令集中监测系统如何在交换机无损伤的情况下接入到信令网中的几种系统接入方式，并举例探讨了从不同远端站采集的七号信令进行数据整合的过程。     

关于Eiffel中复合继承的分析

分析了Eiffel中复合继承的两种方式——多重继承和重复继承,并对多重继承和重复继承中的重命名、未定义、选择等面向对象技术作了总结。     

环形激光束自聚焦效应的补偿研究

采用快速傅立叶变换，对高功率环形激光束在非线性介质传输过程中自聚焦环的形成与抑制进行了研究．结果表明，环形激光束在传输过程中容易形成自聚焦环，然而，当使用具有负折射率系数（γ〈0）的非线性介质作为补偿材料，对非线性效应进行补偿，可以大大减小光束的累积B积分，有效防止环形激光束自聚焦环的产生．     

基于S3C44B0X嵌入式系统的USB主机接口设计

为了适应用户对USB应用的需求,提出了在基于S3C44B0X的嵌入式系统中实现USB主机接口的方案,详细探讨了主机接口的软硬件设计,并将其应用于正在研制的汽车行车记录仪中。     

英汉动物词汇的文化内涵比较

英汉两种语言对各色各样的动物赋予了各具特色的文化涵义,从而构成了富有特色的动物语言词汇。但由于不同的民族文化背景,英汉两种语言对同一动物可能赋予了不同的文化涵义。这就使得英汉两种语言在动物词汇方面既有对应性的一面,又有非对应性的一面。     

一种有效诊断电站热力系统故障源位置的算法

基于符号有向图(SignedDirectedGraph,SDG)的定性推理方法用有向图将故障传播模型化,并用节点间的符号逻辑关系定位系统的故障源,是一种完备的揭示系统故障的有效方法。为了克服其固有缺陷和提高诊断精度,通过采用扩展的有效节点和一致边对被控节点进行描述,用穷举故障模式和搜索有向图的最大强连通支的方法去处理不可测量节点,可对系统故障进行有效的诊断;然后对某些定性特征一样而定量值不同的故障模式,为了能有效区分,通过采取加入适当定量信息去构造定性定量模型的办法来进行进一步诊断。案例试验表明所给出的方法是可行的。