郑州新郑国际机场航站楼钢结构屋盖施工稳定性控制技术研究

郑州新郑国际机场航站楼工程,由于建筑造型需要,采用了大跨度曲线连续空间桁架屋盖钢结构。此结构形式跨度大、施工工艺复杂,工程难度较大。施工过程中,通过采用分段制作、地面拼装、高空成型、积累滑移等工艺,成功地解决了大跨度曲线连续空间桁架屋盖施工的技术难题。通过对在原有的滑移工艺进行多方面的改进和突破,该工程在经济、技术水平和缩短工期方面都取得了明显的进步和提高,对类似屋盖工程施工具有一定的参考和借鉴意义。     

地铁深基坑变形规律及影响因素数值模拟研究

依托黄土地区某城市地铁车站深基坑工程为背景,建立有限元模型,对深基坑施工过程进行有限元分析,对不同工序下深基坑围护结构的变形规律进行研究;以土层粘聚力、钢支撑位置及桩入土深度为影响因素,分别进行模拟分析.研究表明:有限元模拟方法能有效反映基坑维护结构位移变形规律,黄土粘聚力、钢支撑施作位置及围护桩入土深度的变化对基坑围护结构及周围地表位移有一定影响,设计中的钢支撑位置是最优的设置位置.     

邻苯二甲酸酯在松花江吉林段水体中的分布规律

邻苯二甲酸酯是一类含有苯环的有机污染物,易在生物体内富集,所以开展水体中邻苯二甲酸酯的分布规律研究至关重要。对松花江吉林段2008年3月份不同监测断面的水体进行监测,通过GC-MS定性分析和GC定量分析,确定该江段水体邻苯二甲酸酯类污染物的分布规律、污染状况与污染水平。研究结果表明,松花江吉林段水体中主要的邻苯二甲酸酯类污染物是邻苯二甲酸二丁酯和邻苯二甲酸二辛酯,其分布的总体趋势是更易存在于水相中。     

"环保执法难"的问题与对策

从环保执法体制,环保执法法律,环保执法能力等方面简述了环保执法难的原因.指出应理顺环保执法体制,营造良好的执法制度环境.从环保执法的源头入手,完善环保立法.提高执法人员素质,加强执法技术装备,提高环保执法能力.突破现有的环保执法模式,按照可持续发展的现实需要,构建起政府控制与多种形式相结合的开放式的有效环保执法体制,从...     

论清洁生产法治的技术基础

本文深入探讨了产业结构调整、工业污染防治与清洁生产法治的关系，以及企业管理、清洁技术与清洁生产法治的关系。指出产业结构调整、企业管理和清洁技术的应用是实现清洁生产法治的重要技术途径和方式。并已经得到许多国家清洁生产及其法治实践的普遍采用和证实，而清洁生产法治的实现又有利于促进产业结构和企业管理更加生态化，促进清洁技术进一步发展。     

Towards sustainable development? The evolution of environmental policy in Malaysia

Over the last five decades, Malaysia has undergone rapid economic, social and environmental change, a process which is still continuing. The pursuit of socio‐economic progress has been accompanied by an unprecedented rate of change in the natural environment. In parallel to this development, governmental responses have also adapted over time to address emerging environmental situations. This article views the recent history of Malaysia's evolving policy response to development needs and environmental change as consisting of four distinct stages. Despite an impressive array of policy statements and strategies to implement sustainable development, many challenges remain today. A clear articulation of normative principles of sustainable development is of paramount importance, as is the monumental task of policy implementation. The article argues that the trajectory of Malaysia's policy on natural resources and environmental issues bears the characteristics of path‐dependent evolution.     

Is the EU WFD suitable to support IWRM planning in non-European countries? Lessons learnt from the introduction of IWRM and River Basin Management in Mongolia

The Water Framework Directive (EU WFD, 2000/60EC, European Commission, 2000) is a comprehensive tool for water management taking Europe’s diverse national and local policy contexts into account. This has positioned the EU WFD as a potential tool to enhance the implementation of the globally-promoted integrated water resources management concept (IWRM) in developing and transition countries that to date lack comparable regulations. Using the case of Mongolia, a country that has shown interest in using aspects of the EU WFD for implementing its IWRM concept, we will discuss the extent to which the EU WFD also provides a framework for IWRM outside Europe. We find that the EU WFD may provide guidance for the implementation of ecosystem-based River Basin Management (RBM) within an existing national IWRM concept, in terms of public participation and in terms of economic analysis. However, the application of concepts EU WFD is easier if strong political will, good monitoring capacities and a legislative backbone covering key IWRM principles and the capacity for enforcement are in place. Also, the EU-WFD does not provide guidance in terms of water-related issues that are e.g. addressing gender, poverty and capacity development. Thus, the EU WFD cannot serve as a blueprint, as it requires adaptation to the different socio-economic, cultural and political contexts of the implementing country and it does not inform all aspects of IWRM.     

环境权探析及环境侵权的民事救济

环境权是社会生产、生活发展提出的新主张，是人类环境保护工作不断强化的产物。文章对环境权提出的时代背景、环境权的内容和特点作了分析。通过对宪法、环境保护基本法、环境保护单项法的分析，阐述了我国环境权保护的主要法律依据。最后，通过对我国《民法通则》的分析，说明和比较了香港地区和内地地区环境侵权民事救济的异同性。     

Iran's Water Crisis: Cultural, Political, and Ethical Dimensions

By the summer of 2001, most of Iranhad been suffering a three-year drought, theworst in recent history. Water rationing was inplace in Tehran and other cities, and largeproportions of the country's crops andlivestock were perishing. Yet many academicsand other experts in Iran insist that the watercrisis is only partly drought-related, andclaim that mismanagement of water resources isthe more significant cause. Underlying thisdiscussion is a complex of overlapping yetoften conflicting ethical systems – Iranian,Islamic, and modernist/industrialist – whichare available to inform water policy in Iran. Areview of the various arguments about thenature of the crisis and the range of solutionsthat have been proposed, including precedentsfrom traditional Iranian water management andthe ethics of water use in Islamic law,suggests that Iran's own cultural heritageprovides alternatives to wholesale adoption ofWestern models.     

低亚声速大宽高比矩形射流远场噪声特性研究

目的 将空气幕自噪声问题简化为低亚声速大宽高比矩形射流噪声问题,并研究其特性。方法 设计低亚声速大宽高比矩形射流试验台,并系统地研究主要噪声来源以及射流速度、方位角、宽高比等参数对远场噪声的影响规律。结果 低亚声速大宽高比矩形射流远场噪声主要集中在低频部分(500 Hz以内),除宽高比为14的矩形射流噪声因声共振现象导致某些频率附近存在模态噪声峰值,从而不符合噪声频谱归一化规律外,其他低亚声速大宽高比矩形射流远场噪声频谱都符合如下规律,即射流噪声总声压级大致与射流速度的7.4次方成正比,与矩形喷管宽度的1.6次方成正比。结论 低亚声速大宽高比矩形射流远场噪声归一化规律可为深入了解空气幕自噪声特性提供理论指导。