分层开采工艺对地表沉降的影响研究

分层开采是厚煤开采的经典工艺,这种工艺对地表沉降的影响比较复杂。通过测试原岩物理力学参数,利用有限元软件flac3D对分层和一次采全高时地表沉降进行了数值模拟。结果表明,如果采高较小,砌体梁距煤层较近,且采完上分层后长时间停采,给顶板再生留足时间,分层开采较一次采全高对地表沉降影响要小。     

小城镇的生态环境保护

在城镇化不断发展的进程中，小城镇的生态环境日益恶化。分析了小城镇生态环境存在的问题，提出了应采取的生态环境保护规划与对策。     

Genetically Modified (GM) Crops: Precautionary Science and Conflicts of Interests

Risk governance of GM plants and GMfood products is presently subject to heatedscientific and public controversies. Scientistsand representatives of the biotechnologyindustry have dominated debates concerningsafety issues. The public is suspicious withregard to the motives of scientists, companies,and political institutions involved. Thedilemmas posed are nested, embracing valuequestions, scientific uncertainty, andcontextual issues. The obvious lack of data andinsufficient information concerning ecologicaleffects call for application of thePrecautionary Principle (PP). There are,however, divergent opinions among scientistsabout the relevance of putative hazards,definition of potential ``adverse effects,' andwhether actions should be taken to preventharm. The reliance on the concept ofsubstantial equivalence in safety evaluation ofGM food is equally controversial. Consequently,value assumptions embedded in a scientificframework may be a barrier for employment ofthe PP. One of our major conclusions is thatprecautionary GMP usage requires riskassessment criteria yet undeveloped, as well asbroader and more long-term conceptions of risk,uncertainty, and ignorance. Conflicts ofinterest and public participation are otherissues that need to be taken intoconsideration. GMP governance regimes that arejustifiable from a precautionary and ethicalpoint of view must transcend traditionalscientific boundaries to include alternativescientific perspectives as well as publicinvolvement.     

Climate Convention Implementation: An Opportunity for the Pacific Island Nations to Move Toward Sustainable Energy Systems

This article does not focus on adaptation or mitigation policy directly but on an allied opportunity that exists for the Pacific Islands via the auspices of the Climate Convention, because the existing very costly energy systems used in the Pacific Island region are fossil-fuel dependent. It is argued here that efforts can be made towards the development of energy systems that are ecologically sustainable because Pacific Island nations are eligible to receive assistance to introduce renewable energy technology and pursue energy conservation via implementation mechanisms of the Climate Convention and, in particular, through transfer of technology and via joint implementation. It is contended that assistance in the form of finance, technology, and human resource development from developed countries and international organizations would provide sustainable benefits in improving the local Pacific Island environments. It is also emphasized that mitigation of greenhouse gas emissions is not the responsibility of the Pacific Islands as they contribute very little on a per capita global scale and a tiny proportion of total global greenhouse gas emissions.     

1995年世界重要地震灾情及地震活动特征

1995年全世界发生197次6级以上地震，其中有30次7级以上的地震（最大震级8．1级）。具有灾害性的地震为33次，伤亡20人以上的，国内及边界地区为4次，国外有15次，其中有2次灾难性的大地震。该年地震与1994年相比呈明显增强趋势，为本世纪以来第三个强震最多之年。1995年世界地震灾害的主要特点为地震袭击现代化大城市，造成惨重的人员伤亡，惊人的财产损失数额。     

王心芳会长在2006年全国环保产业协会工作会议上的讲话(摘录)

中国环境保护产业协会王心芳会长在2006年7月18-19日在北京召开的全国环境保护产业协会工作会议上，就我国环保产业的现状及存在的主要问题、环保产业“十一五”期间面临的形势及“十一五”期间中国环境保护产业协会主要的工作思路做了讲话（本文为讲话摘录）。     

渭河径流特性研究

由于工农业的快速发展,渭河径流逐年减少,污染加重,河道淤积不断发展,洪涝灾害时有发生,对中下游人民生产生活造成严重影响.为了减少洪害,减轻污染,必须保证渭河常年径流稳定.     

一种DSP+FPGA实时信号处理系统

简要叙述了常用的信号处理系统的类型与处理机结构,介绍了正逐步得到广泛应用的DSP+FPGA处理机结构,在此基础上提出了一种实时信号处理的线性流水阵列,并举例说明了该结构的具体实现,最后分析说明了此结构的优越性。     

南昌市环境空气质量分析和控制

利用多年的环境监测数据,分析南昌市环境空气中主要污染物尘类、二氧化硫和氮氧化物产生的原因,并提出有效控制上述污染物的具体措施。     

准确把握环境形势,认真落实"全面、协调和可持续的科学发展观",努力实现全面建设小康社会的可持续发展目标

本文主要论述了在实现我国中长期环境与资源保护战略目标过程中,环境形势的长期性、艰巨性和复杂性;指出必须通过发展观念、经济增长方式、经济体制和政策职能的转变,树立和落实全面、协调和可持续的科学发展观,促进经济、政治、文化、生态环境的全面发展。