公路建设生态环评编制问题分析

从评价工作等级、评价范围等方面明确公路建设生态环评编制中易忽略的几个问题，籍为提高环评大纲及报告书编制质量有所裨益。     

Simulation of Surface Wave with Large Eddy Simulation in σ-Coordinate System

1 .IntroductionInthepastdecades,thepropagationofwaveswaswidelystudiedbecausemanyindustrialanden vironmentalproblemsincoastalengineeringcouldbecategorizedaswavesorinteractionbetweendis chargeandwaves.Forexample,whenwastewaterisdischargedintoacoastalareathroughanoutfallsystem ,itwillalwaysbesubjectedtotheactionofwaves.Itisimportanttostudyandquantifythisphenomenonsothatanaccurateenvironmentalimpactassessmentcanbemadeforsuchdischargecon ditions.Asafirststep ,thepresentworkaimstostudyanefficientmet…     

用太阳光谱遥测大气污染气体NO_2的含量

利用地面可见光 (4 30— 45 0nm)波段的太阳光谱和大气上界的参考太阳光谱 ,反演出大气中NO2 的柱总含量 ,得到了该地区上空NO2 含量及其变化 ,其变化与当地环境监测站用常规法测量的NO2 浓度的变化基本一致。该文介绍了测量仪器、测量原理和部分测量结果     

兰州—民和盆地地下热水资源潜力评估

通过对兰州—民和盆地地热地质条件综合研究,首次提出热储的概念模型,即地壳深部供热—深大断裂导热—低热导率岩层聚热—侧向地下径流补水。首次明确圈定地下热水资源远景区4处,并采用定量的方法估算出4个远景区的静态可采地下热水资源量热值为6 75×1012KJ(相当于2302 66万吨标准煤的能量)。其中兰州七里河远景区和水登咸水河远景区分别占可采总量的16 24%和77 87%,二者的资源潜力相对较大,具备较好的经济技术开发条件。     

Spatiotemporal Variations in Microbial Communities in a Landfill Leachate Plume

We examined the spatiotemporal changes of microbial communities in relation to hydrochemistry variation over time and space in an aquifer polluted by landfill leachate (Banisveld, The Netherlands). Sampling in 1998, 1999, and 2004 at the same time of the year revealed that the center of the pollution plume was hydrochemically rather stable, but its upper fringe moved to the surface over time, especially at distances greater than 40 m away from the landfill. Complex and spatiotemporal heterogeneous bacterial and eukaryotic communities were resolved using denaturing gradient gel electrophoresis (DGGE) of 16S and 18S rRNA gene fragments. Large fluctuations were noted in the eukaryotic communities associated with strongly polluted and cleaner groundwater. The bacterial communities in strongly polluted samples were different from those in cleaner groundwater in 1998 and 1999, but no longer in 2004. The temporal variation in microbial communities was greater than the spatial variation: the 1998 bacteria communities in strongly polluted groundwater were more related to each other than to those recovered in 1999 and 2004. During the three sampling periods, the bacterial communities were more stable close to the landfill than at larger distances from the landfill. Overall, pollution appears to have only a minor influence on microbial communities. The considerable spatiotemporal variation in microbial community composition may contribute to better biodegradation of pollutants. Designing management strategies for natural attenuation of aquifer pollution will benefit from further long‐term, high‐density monitoring of changes in microbial communities, their diversity and physiological properties, in relation to changes in hydrochemistry.     

氢化物发生-原子荧光光谱法测定铜矿石中的砷锑铋

样品经王水溶矿分解,在氨水存在下,以Fe3+作共沉淀剂分离铜后,用氢化物发生-原子荧光光谱法测定铜矿石中的砷、锑、铋。方法检出限为砷0.19μg/g、锑0.052μg/g、铋0.049μg/g;精密度(RSD,n=10)为砷5.87%、锑7.58%、铋2.42%。     

山西大同数字遥测地震台网中心网络系统集成与资源共享

叙述了山西大同数字遥测地震台网中心网络系统的构成及数据共享的方式,指出用港震系统和泰德系统实现的资源共享方式可满足《数字地震及前兆观测技术规范》所规定的功能要求,运行结果表明该系统行之有效,优点突出。     

短期预报评分系统

短期预报评分系统利用Visual FoxPro6.0开发研制而成，本文介绍了该系统的主要特点和各模块的基本功能。     

水 气二相渗流耦合模型全隐式联立求解

系统论述了水、气二相渗流耦合模型全隐式联立求解的方法与原理。该方法是将水相运动方程和气相运动方程左端的达西系数项、井点的气、水产量项作隐式处理，并将气相和水相方程联立起来进行求解，同时隐式求出压力和饱和度值。因此，收敛速度快，且无条件稳定。该方法应用于沁水盆地3^#煤层气井气，水产量的预测，效果良好。     

边界单元法在高密度电阻率法二维地形改正中的应用效果

给出了高密度电阻率法二维地形改正的边界元数值解法及其探测地下煤气管道时进行二维地形改正的应用实例。