APPLICATION OF TABU SEARCH TO GROUND WATER PARAMETER ZONATION1

ABSTRACT: The spatial distribution of hydrogeologic parameter is an important issue in ground water simulation. One of the methods is to divide an area into several zones such that parameters are assumed to be constant within zone. The purpose of this study is to apply Tabu Search (TS) to find the best zonation of parameters that can result in the best ground water simulation. The initial zonation can be determined as the Thiessen method, and then zonation is optimized by T.S. The mean square error between simulated and observed hydraulic heads was used as the objective function. A designed confined aquifer with known zonation was used as an example to test the proposed method. Results indicated that Tabu Search can locate the optimal zonation successfully and avoid being trapped by local optimal zonations. Besides this, four other arbitrary initial zonations can be directed to the optimal zonation by TS, which proves the robustness of the proposed method. The method proposed in this study is feasible and expected to work well in the field problems with sufficient sampling of concerned parameters.     

蓟运河水中甲基汞形态分布研究

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生化处理油田污水的新趋势

本文介绍了油田污水排放现状、特征和危害及生化处理在油田污水处理方面的成功应用。说明了生化处理在油田污水治理有着良好的运用前景。     

A new hypothesis for the etiology of Kaschin-Beck disease

Kaschin-Beck disease (KBD) could be exogeneous free radical induced endemic osteoarthropathy under conditions of lacking necessary antioxidant defences.especially selenium-cored defence in Chinese eco-en-vironment. Experimental evidences have been provided for the internal relations among previously suggested pathologic factors, i.e., selenium deficiency, organic matters of drinking waterand mycotoxins from contaminated grains, based on the facts that the former is a preventory factor while the others are exogenous freeradical carriers. ESR spectrum shows that these exogenous free radical carriers have a property of semi-quinone compounds and are toxic in in-vitro cartilage cell culture and animal tests in inducing lipid peroxidation process.     

灭螺植物资源的开发利用研究

利用我国灭螺植物资源的优势 ,对32种药用植物[1]进行了灭螺实验 ,并从中筛选出5种对水陆两栖型钉螺(Oncomelaniahupensis)毒杀作用强烈、资源丰富、对环境污染较小的植物。研制了植物颗粒剂和植物粉剂两种灭螺剂型用于灭螺实验。实验结果表明 :植物颗粒灭螺剂对钉螺有强烈的毒杀作用 ,钉螺取食颗粒剂后24h死亡率分别达84 8%～100 % ,其毒杀效果明显优于相同植物的其它灭螺方法 ,对钉螺致死时间比1×10-3g/l氯硝柳胺化学灭螺剂提前12～24h。与其他植物灭螺方法比较 ,具有应用广泛、简便实用的特点 ,为利用植物资源进行灭螺提供了一种新的方法。     

无机膜及其在废水处理中的应用研究新进展

综述了无机膜的制备和无机膜在废水处理中的应用及研究方面的新进展,并讨论 了其以后的应用研究方向和发展前景。     

黄磷行业的清洁生产

黄磷生产具有排污量大、能耗高、资源浪费严重的特点。通过对3家黄磷生产企业开展清洁生产审核,从原辅料和能源、技术工艺、设备、过程控制、管理、员工、产品和废物8个方面进行分析,产生了一系列清洁生产方案。     

“九五”期间大石桥市大气环境质量变化趋势分析

通过对大石桥市“九五”期间大气监测资料的分析研究,从中找出该期间大石桥市大气环境质量的变化规律与发展趋势,分析出大气污染的原因与特征,进一步提出综合防治建议。     

南充市人居环境现状评价初探

文章简要论述了人居环境研究的发展和中国城市人居环境的现状.发展了张仁开先生总结的人居环境评价体系,采用问卷调查的方法获得基础资料.对南充人居环境进行评价,并与长沙市做简要对比.最后得出南充人居环境发展的结论和建议:协调规划城市发展,注重川东北特色城市人居环境的构建.     

低山丘陵区土地整理与可持续发展研究——以广安区为例

为探讨低山丘陵区土地整理的模式，利用MAPGIS软件综合处理研究区大量与土地利用相关的基础数据。针对低山丘陵区土地资源利用的现状及特点，从多方面说明土地整理的迫切性。依据经济、社会、生态相统一的目标，划定3个土地开发整理区，确定开发整理的方向及重点。研究得出土地整理是改善用地结构、协调人地矛盾的有效途径。结论：土地整理应首先以保护耕地数量和质量为核心，集约利用土地，促进耕地总量动态平衡；加强土地管理，提高土地的利用率和综合效益。