首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   194篇
  免费   12篇
  国内免费   2篇
安全科学   37篇
废物处理   3篇
环保管理   33篇
综合类   87篇
基础理论   6篇
环境理论   2篇
污染及防治   6篇
评价与监测   15篇
社会与环境   14篇
灾害及防治   5篇
  2022年   1篇
  2019年   1篇
  2018年   3篇
  2017年   5篇
  2016年   5篇
  2015年   8篇
  2013年   12篇
  2012年   12篇
  2011年   3篇
  2010年   6篇
  2009年   14篇
  2008年   10篇
  2007年   16篇
  2006年   16篇
  2005年   13篇
  2004年   9篇
  2003年   15篇
  2002年   11篇
  2001年   9篇
  2000年   7篇
  1999年   6篇
  1998年   3篇
  1997年   6篇
  1996年   4篇
  1995年   2篇
  1994年   2篇
  1992年   2篇
  1991年   2篇
  1984年   1篇
  1979年   1篇
  1978年   1篇
  1973年   1篇
  1970年   1篇
排序方式: 共有208条查询结果,搜索用时 312 毫秒
51.
On 1 June 2017, the US President Donald Trump officially announced the withdrawal from the Paris Agreement, thus the study on the reasons of withdrawal, the potential impacts, and coping strategies has become a focus among policy circles and of the international community. Based on the self-developed US Policy Assessment Model, this paper systematically evaluates the three potential “major deficits” in terms of mitigation, climate finance, and global climate governance, as a result of the US withdrawal from the Paris Agreement and puts forward policy suggestions for coping with such transformations accordingly. The study shows that the United States ’withdrawal from the Paris Agreement will affect the existence and implementation of successive climate policies and result in an additional 8.8–13.4% increase in the global emissions reduction deficit. The United States’ withdrawal will also deteriorate the existing climate finance mechanism. The Green Climate Fund (GCF)’s funding gap will increase by US$2 billion, while the gap of long-term climate finance will increase by about US$5 billion a year. Either the China–EU or the “BASIC plus” mechanism could fill the governance deficit caused by the United States and the lack of political momentum may continue for a while in the future.  相似文献   
52.
Numerous empirical and simulation-based studies have documented or estimated variable impacts to the economic growth of nation states due to the adoption of domestic climate change mitigation policies. However, few studies have been able to empirically link projected changes in economic growth to the provision of public goods and services. In this research, we couple projected changes in economic growth to US states brought about by the adoption of a domestic climate change mitigation policy with a longitudinal panel dataset detailing the production of outdoor recreation opportunities on lands managed in the public interest. Joining empirical data and simulation-based estimates allow us to better understand how the adoption of a domestic climate change mitigation policy would affect the provision of public goods in the future. We first employ a technical efficiency model and metrics to provide decision makers with evidence of specific areas where operational efficiencies within the nation's state park systems can be improved. We then augment the empirical analysis with simulation-based changes in gross state product (GSP) to estimate changes to the states’ ability to provide outdoor recreation opportunities from 2014 to 2020; the results reveal substantial variability across states. Finally, we explore two potential solutions (increasing GSP or increasing technical efficiency) for addressing the negative impacts on the states’ park systems operating budgets brought about by the adoption of a domestic climate change mitigation policy; the analyses suggest increasing technical efficiency would be the most viable solution if/when the US adopts a greenhouse gas reduction policy.  相似文献   
53.
ABSTRACT Whether the goal is minimizing water quality degradation in receiving streams or maximizing agricultural production on existing croplands; the solutions are identical - improved water management practices. Technology has succeeded in developing feasible solutions to improving irrigation water management, but the law has been slow to encourage or direct implementation. The villain of the western United States water problem is the property right concept of the appropriation doctrine. Improving water management also implies organizational improvements. Also, the so-called “human factor” involves questions of inefficiency and ineffectiveness, that when examined under the criteria of efficacy, may dictate a policy of continuing present practices in certain localities or regions with little technological intervention. The present effort for improving water quality management implies, therefore, a manyfold attack aimed at increasing project irrigation efficiency and effectiveness, under the larger rubric of efficacy and the achievement of larger social goals.  相似文献   
54.
Water resources management in the urban areas of the United States to be effective must include dimensions far beyond water supply and sewerage. This paper concerns itself with those problem areas of water resource management outside of potable water supply and sanitary sewers. These areas include flood plain management, greenways and blueways, storm water, vistas of waterways, and other attributes of living in or near a water-related environment. The perceptions and attitudes of the concerned public and community power structure must be known in order to manage the water environment effectively. Methods of measuring these perceptions and attitudes are described and ways in which the resulting citizen-resource can be tapped and used as a management device are explored.  相似文献   
55.
水是关系社会可持续发展的重要资源,但是我国水管理的弊端造成水资源状况不容乐观。针对这一情况,2002年《水法》的修改重点之一是加强了水资源统一管理。本文从统一管理的必要性出发,分析了《水法》有关水资源统一管理的规定,并指出了有待完善之处。  相似文献   
56.
ABSTRACT: Voluntary water transfers through markets have been advocated by many diverse groups as a means to reallocate scarce water supplies in the semi-arid western U.S. Although transfers of water rights have occurred almost since the creation of prior appropriation laws over a century ago, functioning water markets have been very slow to develop and are few in number. The structure, composition, administration and transactions of one of the most well established water markets, shares in the Bureau of Reclamation, Colorado-Big Thompson project, are examined to better understand the institutional and transfer conditions that sustain an active water market. Results from a detailed study of C-BT project records reveal that between 1970 and 1993 there were 2,698 transactions through which over one-third of the project water changed ownership or type of use. Further analysis shows that the transactions involved many individual sellers and categories of buyers with different uses, including agricultural buyers. The transfer activity and efficiency of the C-BT market has lead some to suggest that it be used as a model for other markets. However, because this market has fewer institutional restrictions, a well developed infrastructure and unique market conditions, it will be difficult to transfer this model to other areas without accompanying modifications in water right administration and institutions.  相似文献   
57.
针对医院污水中含有大量致病微生物和有机污染物的特点,选用生物接触氧化-沉淀-加氯消毒处理工艺流程及科学的调试、运转管理模式后,不仅能提高污水处理效果,还能大大降低运行成本,并最终使出水各项指标达到国家规定的排放标准。  相似文献   
58.
我国城市总体规划的环境影响评价刚刚起步,其研究的技术方法体系还处于探讨阶段,这给城市总体规划环境影响评价的实施带来了理论和实践上的障碍。文中针对城市总体规划设计了评价指标体系,从规划分析、环境影响分析、减缓措施和环境管理计划4方面阐述了评价内容。并对现有的评价技术方法进行了总结。  相似文献   
59.
我国灾害现代管理模式的构想   总被引:9,自引:8,他引:9  
杨马陵  续新民 《灾害学》2004,19(4):83-88
分析了世界多个国家的灾害应急管理模式、特点,讨论了我国灾害管理模式的现状及存在的问题,从立法、机构设置、应急机制和体系建设等方面提出了建设我国灾害现代应急管理模式的构想.  相似文献   
60.
试论执行力文化的构建与政府行政效率的提高   总被引:1,自引:0,他引:1  
首先论述了执行力文化的提出及内涵,随后说明了导致政府行政效率低下的3个原因,由此引出了在政府中倡导构建执行力文化是提高政府效率的有效手段,最后以秦皇岛市为例,说明了在政府中如何构建执行力文化的几个方面内容.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号