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。     

Dynamics and Causation of Environmental Equity, Locally Unwanted Land Uses, and Neighborhood Changes

/ Why are some environmental risks distributed disproportionately in the neighborhoods of the minorities and the poor? A hypothesis was proposed in a recent study that market dynamics contributed to the current environmental inequity. That is, locally unwanted land uses (LULUs) make the host communities home to more poor people and people of color. This hypothesis was allegedly supported by a Houston case study, whereby its author analyzed the postsiting changes of the socioeconomic characteristics of the neighborhoods surrounding solid waste facilities. I argue that such an analysis of postsiting changes alone is insufficient to test the causation hypothesis. Instead, I propose a conceptual framework for analysis of environmental equity dynamics and causation. I suggest that the presiting neighborhood dynamics and the characteristics of control neighborhoods be analyzed as the first test for the causation hypothesis. Furthermore, I present theories of neighborhood change and then examine alternative hypotheses that these theories offer for explaining neighborhood changes and for the roles of LULUs in neighborhood changes. These alternative hypotheses should be examined when analyzing the relationship between LULUs and neighborhood changes in a metropolitan area. Using this framework of analysis, I revisited the Houston case. First, I found no evidence that provided support for the hypothesis that the presence of LULUs made the neighborhoods home to more blacks and poor people, contrary to the conclusion made by the previous study. Second, I examined alternative hypotheses for explaining neighborhood changes-invasion-succession, other push forces, and neighborhood life-cycle; the former two might offer better explanation.KEY WORDS: Environmental equity and justice; Locally unwanted lane uses; Siting; Market dynamics; Invasion-succession; Neighborhood changes     

某铀矿工人头发中总α,总β,铀,钍放射性水平的调查

本文对某铀矿职业工人和非职业工人头发中的总β、总α放射性水平和铀、钍含量进行了分析测定.结果表明,该矿工人体内铀和钍的蓄积量均在正常放射性本底水平范围内,从头发中检验未观察到工人体内铀、钍放射性水平有明显的升高.     

废塑料与炼焦配煤共焦化产物的分析

利用2kg模拟焦炉，进行了首钢炼焦配煤与北京市石景山区生活垃圾中的废塑料的共焦化实验。研究结果表明，添加废塑料有提高焦油收率和减少水的收率的趋势；但添加废塑料对成焦率、焦油产率及水产率的影响随废塑料处理方法和废塑料添加比例的不同而有差异；采用废塑料型煤或废塑料型煤破碎物与配煤共焦化在提高废塑料添加比例方面具有较大优势。     

热带海洋环境中BHC和DDT的行为特征研究Ⅰ.中国珠江口区旱季BHC和DDT的含量与分布

本文于1994年11月用气相色谱法研究了旱季珠江口区环境中BHC和DDT的含量与分布。结果表明，表层海水BHC含量为0.187μg/L，DDT为0.080μｇ/L；底层海水BHC为0.117μｇ／L，DDT为0.506μｇ／L。沉积物BHC为11.15×10－9（干），DDT为33.46×10－9（干）。海水中的盐度、DO、C     

我国电子商务环境研究

概述了电子商务的定义、特征及其目前的发展情况,着重对我国的电子商务环境进行了分析,简要提出了发展我国电子商务的模式与策略。     

关于促进我国循环经济法制建设的思考

循环经济作为一种有效平衡经济增长,社会发展和环境保护三者关系的全新经济模式,在我国的发展已是大势所趋.而这一系统工程建立的基础是相关法律法规的建立.目前,许多发达国家已经以立法的方法来保障循环型社会的建立和发展.加快我国循环经济法制建设需要对循环经济的内涵,发达国家的循环经济立法,我国循环经济法制建设的实践及其存在的问题进行系统研究,根据我国的实际情况,得出对中国的循环经济立法具有针对性的建议,在依法治国的当今中国,以法律形式对循环经济加以肯定和规范具有重要意义.     

湿法烟气脱硫的腐蚀机理及防腐技术

综述了湿法烟气脱硫的腐蚀与防腐现状，分析了腐蚀环境及腐蚀机理，并概括总结了湿法烟气脱硫工艺系统中材料防腐技术和工艺防腐技术，对此法的现场实际应用有一定的指导意义。     

浅谈内蒙古草原生态环境现状及其保护对策

本文针对当前内蒙古草原生态环境现状以及草原资源利用所面临的问题，从利用制度、管理措施等多方面提出了加强草原保护和合理利用的相应对策。     

半干法喷射烟气脱硫试验研究

介绍了半干法喷射烟气脱硫试验 ,研究了钙硫比、雾化水量、进口SO2 浓度、湿度等主要因素对脱硫率的影响规律 ,对布袋除尘器的辅助脱硫也进行了研究。结果将有助于改进半干法脱硫技术 ,并为进一步的工业应用提供了参考数据。