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   393篇
  免费   50篇
  国内免费   8篇
安全科学   34篇
废物处理   5篇
环保管理   134篇
综合类   170篇
基础理论   34篇
环境理论   4篇
污染及防治   12篇
评价与监测   18篇
社会与环境   33篇
灾害及防治   7篇
  2024年   2篇
  2023年   9篇
  2022年   10篇
  2021年   16篇
  2020年   21篇
  2019年   14篇
  2018年   13篇
  2017年   27篇
  2016年   34篇
  2015年   31篇
  2014年   16篇
  2013年   33篇
  2012年   18篇
  2011年   35篇
  2010年   24篇
  2009年   15篇
  2008年   15篇
  2007年   10篇
  2006年   22篇
  2005年   8篇
  2004年   6篇
  2003年   12篇
  2002年   8篇
  2001年   7篇
  2000年   6篇
  1999年   7篇
  1998年   8篇
  1997年   1篇
  1996年   5篇
  1995年   2篇
  1994年   1篇
  1993年   1篇
  1992年   1篇
  1991年   1篇
  1989年   1篇
  1986年   1篇
  1985年   2篇
  1980年   1篇
  1979年   1篇
  1978年   2篇
  1977年   2篇
  1973年   1篇
  1971年   1篇
排序方式: 共有451条查询结果,搜索用时 15 毫秒
81.
The present development plan system in Scotland began in 1975. Its origins and purpose are discussed. Progress in the submission and adoption/approval of local and structure plans and in reviewing these plans is outlined. Performance to date is assessed and means of improvement are suggested, in relation to timeliness, transparency, scope and quality.  相似文献   
82.
The paper demonstrates why it is necessary to take the restoration of marine coastal ecosystem health as a new goal for integrated catchment management, in coastal area of the Tolo Harbour. The present goal of integrated catchment management (ICM) in the Tolo Harbour is to meet with Water Quality Objectives. The performance of an ICM plan, Tolo Harbour Action Plan (THAP), is evaluated by using marine coastal ecosystem health indicators including stress indicators and responses indicators. Since the implementation of THAP in 1988, some significant reduction in pollution loading has been observed - reduction of 83 % of BOD load and 82 % of TN between 1988 and 1999. There has been an improvement in the health state of Tolo Harbour marine coastal ecosystem as evidenced in the trends of the physical, chemical and biological indicators, although some reverse fluctuations in some periods exist. However, this can only be considered as the first sign of the ecosystem health restoration, since ecosystem health co  相似文献   
83.
One of the most pressing environmental issues today is the possibility that projected increases in global emissions of greenhouse gases from increased deforestation, development, and fossil-fuel combustion could significantly alter global climate patterns. Under the terms of the United Nations Framework Convention on Climate Change, signed in Rio de Janeiro during the June 1992 Earth Summit, the United States and other industrialized countries committed to balancing greenhouse gas emissions at 1990 levels in the year 2000. Included in the treaty is a provision titled Joint Implementation, whereby industrialized countries assist developing countries in jointly modifying long-term emission trends, either through emission reductions or by protecting and enhancing greenhouse gas sinks (carbon sequestration). The US Climate Action Plan, signed by President Clinton in 1993, calls for voluntary climate change mitigation measures by various sectors, and the action plan included a new program, the US Initiative on Joint Implementation. Wisconsin Electric decided to invest in a Jl project because its concept encourages creative, cost-effective solutions to environmental problems through partnering, international cooperation, and innovation. The project chosen, a forest preservation and management effort in Belize, will sequester more than five million tons of carbon dioxide over a 40-year period, will become economically selfsustaining after ten years, and will have substantial biodiversity benefits.  相似文献   
84.
简要论述了县级生态农业建设的重要性 ,详细介绍了县级生态农业建设规划和实施的方法 ,既可以在生态农业县建设的规划上提供了借鉴 ,又对如何实施县级生态农业建设进行了探讨 ,对促进我国生态农业建设具有一定的意义。  相似文献   
85.
实施ISO14000标准促进绿色行政和可持续发展   总被引:1,自引:0,他引:1  
政府推行ISO14000标准,实施“绿色行政”,不仅能提高政府环境管理的水平,而且可以极大的提高政府的形象,并通过制定科学的、符合生态规律的发展规划,采取切实可行的、对环境友好的技术管理措施,达到保护生态环境、自然资源、实现可持续发展战略的目的。为了适应加入WTO的需要,实现环境管理和国际接轨,带动更多的企事业单位向科学的环境管理模式迈进,在政府开展ISO14000,实施“绿色行政”方面作了有益的探索。  相似文献   
86.
广西贵港市土地利用总体规划实施评价   总被引:15,自引:0,他引:15  
目前沿用的土地利用总体规划实施评价的方法多为定性的直接描述法,缺乏科学的评价体系,难以对规划实施的效果作出客观、科学的评判。文章引入层次分析法(AHP),对贵港市土地利用总体规划实施效果进行量化研究。结果表明,虽然当地政府高度重视规划的实施,实施情况总体良好,但社会经济成效指标和完成性指标评价得分较低。建议该市今后加快“三农”政策的落实,以提高农民种粮的积极性和农民的收入水平;加大土地开发复垦、退耕还林资金投入,并制定有力的保障措施,促进完成性指标的实施。同时,提高社会意识度,是规划实施工作的重中之重,今后的规划要强化公众参与。  相似文献   
87.
伴随着高等教育大众化的进程,高等职业教育正在实现跨越式的发展。在此形势下,如何确保“规模与质量”、“效益与效率”的同步提高已经日益成为国家和社会关注的焦点。构建一套科学完备、可操作性强的教学质量监控体系无疑是保证人才培养质量的重要条件。本文旨在对高职高专院校学校层面的教学质量监控体系的构建和实施进行初步探讨。  相似文献   
88.
新<海洋环境保护法>与有关国际公约的实施   总被引:3,自引:0,他引:3  
概述了新《海洋环境保护法》与《73/ 78防污公约》、《1990年国际油污防备、反应和合作公约》、《1992年国际油污损害民事责任公约》等有关国际防污公约相关条款的相互关系及其实施  相似文献   
89.
Over the past decade, the emission standards and fuel standards in Beijing have been upgraded twice, and the vehicle structure has been improved by accelerating the elimination of 2.95 million old vehicles. Through the formulation and implementation of these policies, the emissions of carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen oxides (NOx), and fine particulate matter (PM2.5) in 2019 were 147.9, 25.3, 43.4, and 0.91 kton in Beijing, respectively. The emission factor method was adopted to better understand the emissions characteristics of primary air pollutants from combustion engine vehicles and to improve pollution control. In combination with the air quality improvement goals and the status of social and economic development during the 14th Five-Year Plan period in Beijing, different vehicle pollution control scenarios were established, and emissions reductions were projected. The results show that the emissions of four air pollutants (CO, VOCs, NOx, and PM2.5) from vehicles in Beijing decreased by an average of 68% in 2019, compared to their levels in 2009. The contribution of NOx emissions from diesel vehicles increased from 35% in 2009 to 56% in 2019, which indicated that clean and energy-saving diesel vehicle fleets should be further improved. Electric vehicle adoption could be an important measure to reduce pollutant emissions. With the further upgrading of vehicle structure and the adoption of electric vehicles, it is expected that the total emissions of the four vehicle pollutants can be reduced by 20%-41% by the end of the 14th Five-Year Plan period.  相似文献   
90.
为了实现重大生产安全事故救援费用的公平负担,保障救援机制的可持续性,通过规范分析和比较分析,探讨了在第三方队伍参与救援的情况下,重大生产安全事故救援费用的承担原则和实现机制。研究结果表明:第三方队伍参与事故救援所产生的当次费用原则上必须由事故责任单位承担,但在其拖欠费用或者暂时缺乏支付能力的情况下,应当由承担应急救援职责的事发地政府先行垫付;由此在事发地政府和事故责任单位之间产生的是公法之债,可以通过行政强制执行的方式加以追偿。  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