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   10313篇
  免费   37篇
  国内免费   4篇
安全科学   42篇
废物处理   886篇
环保管理   1319篇
综合类   1037篇
基础理论   3256篇
环境理论   4篇
污染及防治   1834篇
评价与监测   1036篇
社会与环境   927篇
灾害及防治   13篇
  2023年   6篇
  2022年   10篇
  2021年   16篇
  2020年   14篇
  2019年   19篇
  2018年   1493篇
  2017年   1394篇
  2016年   1220篇
  2015年   156篇
  2014年   32篇
  2013年   65篇
  2012年   485篇
  2011年   1378篇
  2010年   723篇
  2009年   637篇
  2008年   909篇
  2007年   1266篇
  2006年   41篇
  2005年   44篇
  2004年   53篇
  2003年   76篇
  2002年   113篇
  2001年   23篇
  2000年   19篇
  1999年   13篇
  1998年   17篇
  1997年   8篇
  1996年   8篇
  1995年   6篇
  1994年   3篇
  1993年   6篇
  1992年   6篇
  1991年   10篇
  1990年   5篇
  1989年   4篇
  1986年   6篇
  1984年   13篇
  1983年   9篇
  1981年   2篇
  1972年   2篇
  1971年   2篇
  1961年   3篇
  1959年   2篇
  1958年   2篇
  1957年   5篇
  1955年   5篇
  1954年   2篇
  1940年   2篇
  1935年   2篇
  1926年   1篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
41.
42.
43.
44.
A promising new pathway for research on environmental justice is understanding public perceptions of justice or equity around a range of issues. Here we focus on policies intended to reduce air pollution from road traffic. We ask different urban communities, distinguished by the quality of local air and by socio-economic status, to judge the equitability of policies intended to reduce traffic emissions, both in terms of the environmental benefits of the policies and allocating the financial burden of paying for improvements. In the latter case, we are interested not only in the popular principles of equity that emerge, but also in whether a trade-off might exist between such principles of equity and the overall effectiveness and cost of the policy.  相似文献   
45.
Throughout history, mining communities have invariably found themselves striving for a good quality of life and a long‐term future. In the 21st century, problems of maintaining the economic vitality of mining regions are now compounded by concerns about the biophysical integrity of the local environment. In regions of the world where the economic viability of the resource is marginal and achieving a reasonable quality of life is a daily struggle, sustainable mining may seem to be a dubious prospect at best. Yet the twin imperatives of global political forces and burgeoning environmental concerns are requiring industry, governments and other interests to re‐conceptualize the way in which mining takes place in communities. Although mining itself may not be seen as an industry that contributes to the achievement of environmental objectives, it could — with careful planning — be used as a tool to foster a more sustainable and healthier community. This argument is considered in the context of the coal mining region of Santa Catarina, Brazil.  相似文献   
46.
This paper explores the apparent contradiction between the 'linearity' of most Sustainable Development projects, with time-bound and defined outputs achieved at a fixed cost, and an implied 'circularity' of the theory whereby there is no 'end'. Projects usually have clear parameters within which they are implemented, and the inclusion of elements such as the need for accountability, measurable impact and 'value for money' have grown in importance. It could be argued that we live in a 'projectified' and therefore linear world. The paper explores the potential contradiction between 'linearity' and 'circularity', and suggests that one way around this is to frame the project within a form of the Kolb Learning Cycle heuristic. This will facilitate a rationalisation from those implementing the sustainable development project as to why decisions are being made and for whom. If these questions are opened up to the project stakeholders, including beneficiaries, then the Kolb cycle could encourage learning and understanding by all involved. It could also provide Sustainability Therapy to those trapped in processes, which they find orthogonal to their own perceptions. It is suggested that such learning, therapy and reflective practice should be a valid output of the sustainable development project, although typically the focus is only upon the final outputs and how they feed into policy. Ironically funders would be well advised to take a broader perspective in order to achieve true 'value for money' within such projects, even if learning is not an easily measurable or tangible outcome. These points are explored within the context of the wider literature and experience with a sustainable development project undertaken in Malta.  相似文献   
47.
48.
49.
This study aimed at finding effective strategies for high-performance removal of reactive blue 19 (RB19) dye from aqueous solution. Chitosan (CS) films had been prepared by using solvent casting with mild drying for this purpose. The CS films were characterized by X-ray diffraction, field-emission scanning electron microscopy, and Fourier transform infrared (FTIR) spectroscopy. The performance of RB19 removal using CS were evaluated by varying contact time, solution pH, initial dye concentration, and adsorbent dosage. Adsorption isotherms, kinetics, and desorption were investigated by batch experiments. Results showed that CS films exhibited the optimal adsorption performance for RB19 removal and high maximum adsorption capacities of RB19, which were 799 and 822.4 mg g?1 at 20 and 40 °C, respectively. Adsorption kinetic data were well described by the pseudo-second-order kinetic model. FTIR analyses further indicated that interactions between RB19 and the CS film occurred during adsorption. The CS films also exhibited satisfactory desorption of RB19 at about 80 % after 30 min of desorption at pH 11. Our study demonstrated that the CS films can be easily prepared and applied for effective removal of RB19 in treatment of wastewater.  相似文献   
50.
Environmental Science and Pollution Research - The assessment of productivity change over time and its drivers is of great significance for water companies and regulators when setting urban water...  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