Farming ‘practice’ as temporally and spatially situated intersections of biography,culture and social structure

This paper brings anthropological, sociological and geographical perspectives to bear on the problem of farm sustainability and, in particular, the legitimation of sustainable farm practices. It attempts to lay some theoretical foundations for explanation of the adoption of farming practices which may, or may not, promote sustainability. A brief survey of the literature surrounding these issues finds many of the current theoretical perspectives incapable of fully accounting for the complexity of farming practice. Reductionist decision/rational‐action models, in particular, are found wanting for their lack of both cultural consistency and social/spatial specificity. Instead, this paper promotes a generative structuralist approach directed towards an analysis of social and economic practice in lived space; that is, firmly anchored in long‐term ethnographic research.     

中国南极信息系统总体框架的构想与研究

本文根据现实需求和所面临的国际环境,以系统论、信息论、控制论为基本立足点,探讨了中国南极信息系统(CAIS)总体框架的构想以及如何建立CAIS的若干问题。文中阐述了建设CAIS与南极信息资源管理(AIRM)之间相辅相承的关系;描述了CAIS的概念结构和基本结构的框架模型;研究了总体框架及系统的基本特征;分析了基本结构的层次性和相关性。针对易造成信息系统脆弱性的各种问题,讨论了需采用的技术、研究方法、开发策略、应遵循的基本规律,指出CAIS的第一个实践目标是开发与编写基于ADIF(南极目录交换用格式)的南极数据目录和南极主题词表。     

The management of sewage sludge by the water industry in England and Wales

Summary The legislative framework within which the disposal of sewage sludge is managed in England and Wales and the methods employed are outlined. Those factors which affect management decisions are analysed and consideration is given to the environmental implications of those decisions. Sewage processes and sludge disposal are considered, and the problems, especially those of heavy metal contamination, are addressed. An indication is given as to how the Water Services Companies are likely to implement the more stringent controls on disposal. Finally, the future of sludge management in England and Wales is discussed.Abbreviations BAT Best available technology - BATNEEC Best available technology not entailing excessive cost - BOD₅ Biochemical oxygen demand - BPEO Best practicable environmental option - CBI Confederation of British Industry - CEST Centre for Exploitation of Science and Technology - COD Chemical oxygen demand - CSC Customer Services Committee - DAF Dissolved air flotation - DG Director General - DoE Department of the Environment - DS Dried solids     

煤矿地质信息系统

介绍了煤矿地质信息、系统的构成、各模块的性能、功能、自动绘图中各个技术难点的解决方法和途径以及系统的运行环境。该系统是地质测量信息系统中的地质子系统。它是在现有微机环境下开发的集数据管理、统计计算、制表、绘图、辅助决策于一体的计算机地质信息管理系统。     

渭干河——塔里木河流域地下水水化学分带及其形成机制

本文从水文地质条件和环境水文地质条件入手,讨论了位于欧亚大陆腹地的渭干河——塔里木河流域这样一个大区域的地下水水化学分带问题。进而通过对渭干河、库车河冲积扇的砂体分布规律以及地下水的补给、径流、排泄特征差异的研究,阐明了地下水水化学分带性的形成机制。     

一个地下水资源系统管理模型的研究

本文以三坝灌区地下水资源的开发利用为例,介绍了一个反映地下水运动规律的综合性数学模型,并且将数值法与地下水资源系统分析的线性规划方法结合起来,提供出一个完整的模型。目的在于对地下水资源系统进行优化管理。     

世界森林的数字地球监测

介绍中国风云气象卫星FY－1,FY－2对地观测数据应用于全球森林资源的分类监测。讨论中国加入WTO以后对全球森林资源再分配的新战略。以全球观点,分析贵州省的森林资源特色及其对世界的特殊贡献。评价21世纪中国森林数据库与林业管理信息系统的规划与建设。     

世界森林的数字地球监测

介绍中国风云气象卫星FY－1,FY－2对地观测数据应用于全球森林资源的分类监测。讨论中国加入WTO以后对全球森林资源再分配的新战略。以全球观点,分析贵州省的森林资源特色及其对世界的特殊贡献。评价21世纪中国森林数据库与林业管理信息系统的规划与建设。