广州轨道交通三号线高速行驶条件下对安全限界的影响研究

给出了轨道交通车辆横向偏移量的计算方法 ,并应用列车 -线路动力耦合模型 ,分析了广州地铁三号线的安全限界变化问题。确定了当前按 80km/h行车速度设计的建筑限界能满足 13 0km/h行车速度的要求 ,限界尺寸不需改动可保证列车运行安全平稳     

村级水资源的管理与利用研究--来自南方四个村的案例分析

农村水资源及其相关设施的改革需要更多了解村和户层次上的现实状况和机制安排。以避免改革扭曲和失败。通过对湖北和广西共四个村的村委会、关键知情人及120个农户的调查。在村和农户两个层次上描述水资源及其相关设施的管理与利用，尤其是在干旱年份村和户所采取的策略。并深入分析了农村村级水资源管理与利用的制度安排与问题。得出的结论是。追求水利管理效率的市场化改革需要考虑干旱的威胁，要有基于风险的制度设计和法律保障。     

高效液相色谱测定花粉素中水溶性维生素

本文介绍一种灵敏而准确的高效液相色谱测定花粉素中五种水溶性维生素(即B_1、B_2、B_5、B_6和B_(12))方法。研究了移动相醋酸盐缓冲溶液的浓度和PH对色谱分离效果的影响,水溶性维生素的定量分析是用日立3011-N的填充柱(其内径为4毫米,长250毫米),以含有2.5％乙醇的醋酸钠-醋酸组成的缓冲溶液(PH6)作为移动相,在波长254纳米处进行紫外检测,变异系数和回收率分别为2-5％和91.0-101.5％。     

Determination of organophosphorus pesticides and related compounds in water samples by membrane extraction and gas chromatography

A membrane extraction-gas chromatography method was developed fordetermination of organophosphorus pesticides and related compounds including methamidophos, DDVP, dimethoate, methyl parathion, parathion, thiophosphoric acid trimethyl ester, and thiophosphoramidic acid dimethyl ester in water samples. In thismethod, surface-modified acetic cellulose membranes were used to extract the target analytes in water samples, the extracted analytes were back-extracted into a small amount of methanol, andgas chromatography with pulsed flame photometric detector (GC-PFPD) was used to determine the concentrations of targetanalytes in the extracts. The recoveries obtained for thetarget analytes spiked into the water samples ranged from 66to 94%. The method detection limit for each target analyte was 0.05 g L^-1. The method developed in this study had shown the advantages of being cheap, simple, fast, and reliable. It had been used successfully to determine the concentrations of target analytes in river water samples.     

Monitoring of Butter and Ghee (Clarified Butter Fat) for Pesticidal Contamination from Cotton Belt of Haryana, India

Butter (45) and ghee (55) samples were collected from rural and urban areas of cotton growing belt of Haryana and analysed for detecting the residues of organochlorine, synthetic pyrethroid and organophosphate insecticides. The estimation was carried out by using multi residue analytical technique employing GC-ECD and GC-NPD systems equipped with capillary columns. Butter samples were comparatively more contaminated (97%) than ghee (94%), showing more contamination with organochlorine insecticides from urban samples. About 11% samples of butter showed endosulfan residues above MRL value and 2% samples had residues of synthetic pyrethroids and organophosphates each above their respective MRL values. In ghee, residues of HCH & DDT both and of endosulfan exceeded the MRL values in 5 and 20% samples, respectively. Among organophosphates, only chlorpyriphos was detected with 9% samples showing its residue above MRL value. Irrespective of contamination levels, residues above the MRL values were more in ghee. More extensive study covering other agricultural regions/zones of Haryana has been suggested to know the overall scenario of contamination of milk products.     

Optimal charges on river effluent from lumped and distributed sources

We propose a modelling framework for the design of a Pigouvian effluent tax, in an environmental management problem implicating several economic agents located in a river basin. The proposed charging system allows for the agents' geographical position relative to the river's sections, at which environmental standards are to be enforced, and takes into account the possible different market structures within which the agents are operating. In particular, we consider industrial agents competing on an oligopolistic market, and a set of farmers acting as price takers on a large market. A regional authority's goal is to induce agents to some sort of cooperation which would result in the satisfaction of the common environmental constraints. The economic process on one side, and the pollution transport and accumulation on the other, constitute two dynamic processes in two different time scales. As the economic process is much slower than the other process we can neglect the latter's transients and concentrate on the time invariant steady state solutions to the transportation equation. The model thus constructed has some noncooperative game and optimal control problem's features with space being the ‘running’ variable. This revised version was published online in July 2006 with corrections to the Cover Date.     

面向新世纪的MARPOL73／78公约及其附则Ⅱ

国际海事组织目前正在对《ＭＡＲＰＯＬ７３／７８公约》附则Ⅱ－控制散装液体有毒物质污染规则作重大修改，内容包手胡毒液体物质和化学品，这很可能对主管机关、船公司和化工界造成严重的冲击。     

江苏省盐城市环境空气质量综合评价及整治对策

随着经济发展的加速,盐城已逐步融入长三角经济体系中,城市现代化建设正在大踏步向前迈进,城市生态环境问题也日益受到关注,生态环境问题已成为社会关注的焦点,是衡量盐城社会经济发展的重要指标,实现环境、经济、社会的和谐发展已逐步成为人们的共识.文章针对盐城环境空气质量问题,运用SO2、NO2和PM10等指标表示空气环境质量,采用模糊综合评价方法对盐城空气环境质量等级进行了划分,并采用API指数评价方法对污染程度作出了评价,分析了盐城环境空气质量面临的挑战,提出了盐城市区污染的防控措施.     

己二胺有机废液在流化床中焚烧的实验研究

在实验室规模的热态流化床试验台上，进行了含5％己二胺有机废液的焚烧 实验研究，在700－900℃范围内，研究温度及空气过剩系数对NOx沿床高的变化规律，以及它们对NOx排放浓度的影响。实验结果表明，沿高度方向上NOx浓度 逐渐降低，并且存在NO2浓度大于NO浓度这一有趣现象，在900℃下氧量增加有利于密相区NO、NO2浓度的降低，说明在 有氧条件下NH2促进NOx的还原，在不同空气 过剩系数下和然相区出口NOx几乎为零 ，表明900℃是己二胺有机废液焚烧 的合适温度。     

顶空气相色谱分析法测定饮用水中的挥发性卤代烃

本文详细介绍了顶空气相色谱分析法测定的适用范围，试剂材料样品采集和试验结果等。