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   28666篇
  免费   169篇
  国内免费   167篇
安全科学   411篇
废物处理   1504篇
环保管理   3411篇
综合类   5337篇
基础理论   7353篇
环境理论   10篇
污染及防治   6419篇
评价与监测   2248篇
社会与环境   2252篇
灾害及防治   57篇
  2022年   171篇
  2021年   184篇
  2019年   146篇
  2018年   1679篇
  2017年   1566篇
  2016年   1552篇
  2015年   406篇
  2014年   506篇
  2013年   1389篇
  2012年   970篇
  2011年   2026篇
  2010年   1254篇
  2009年   1233篇
  2008年   1608篇
  2007年   1976篇
  2006年   727篇
  2005年   627篇
  2004年   652篇
  2003年   676篇
  2002年   676篇
  2001年   739篇
  2000年   483篇
  1999年   343篇
  1998年   222篇
  1997年   240篇
  1996年   244篇
  1995年   277篇
  1994年   261篇
  1993年   247篇
  1992年   226篇
  1991年   235篇
  1990年   238篇
  1989年   202篇
  1988年   191篇
  1987年   180篇
  1986年   172篇
  1985年   173篇
  1984年   195篇
  1983年   207篇
  1982年   191篇
  1981年   181篇
  1980年   158篇
  1979年   149篇
  1978年   150篇
  1977年   130篇
  1976年   122篇
  1975年   129篇
  1974年   132篇
  1972年   113篇
  1967年   119篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
153.
This paper discusses the findings of a small scale research project which explored the possibility of adopting eco-design techniques. The paper focuses on identifying how eco-design techniques can be determined as being compatible with new product development processes. Via the development of a five stage ‘applicability framework’, this study demonstrates how a compatible suite of tools can be identified for application to product development processes. Testing and validation of this ‘applicability framework’, which was used to identify three key eco-design techniques; namely checklists, guidelines, and a material, energy and toxicity (MET) matrix, is shown to have taken place in relation to the development of a lightweight chemical detector product. It is established that checklists, guidelines and the MET matrix can be used both on a specific product, and also more generally in the design process. In particular, the MET matrix is shown as being used to successfully identify key environmental aspects of the product during its lifetime. The paper concludes by arguing that eco-design techniques may not have been more widely adopted by businesses because such methods are not necessarily generic and immediately applicable, but instead require some form of process-specific customisation prior to use, which can in turn act as a barrier to adoption. It is also highlighted that the shear diversity of pressures that come to bear during the product development process can also act as a barrier to adoption, and that the full integration of eco-design techniques will have to encompass approaches which overcome such pressures.  相似文献   
154.
The cost effectiveness of catchment-wide funding for the environmental remediation of urban waterways on the scale of a major metropolitan catchment is examined considering the typical land-use and pollutant-export characteristics of urban catchments. The evaluation is performed by comparing the effectiveness of the major stormwater treatment modes for the pollutants of concern with the proportion of pollutant export to which the measure applies. The heavy metals copper, lead, and zinc in the aqueous phase or bound to fine particulates are identified as representative of the pollutants of concern in drainage from urban catchments. The analysis suggests that these priority pollutants are predominantly (79–87%) derived from runoff from residential property and roads as disseminated urban surfaces. Analysis of a specific case of catchment-wide funding of stormwater remediation in the Sydney Harbour catchment, Australia reveals that the funding allocation cannot be expected to have achieved reductions in the loads of priority pollutants due to the types of treatment measures implemented and the sources addressed. The apportionment of funding in better accordance with the maximum potential effectiveness of stormwater treatment modes and the pollutant-export characteristics of urban catchments could thus be expected to achieve a more cost-effective result from such funding initiatives.  相似文献   
155.
A market has emerged for carbon sequestered through reforestation. The opportunity to restore ecosystems through this market rather than establish plantations is demonstrated by an Australian case study. In the state of Queensland there are vast areas that have been cleared relatively recently and could be restored to ecosystems with high resilience and important biodiversity values with appropriate management. In order to foster opportunities for carbon accumulation through ecosystem recovery spatially explicit information on sequestration rates, management recommendations, and clear definitions of ancillary biodiversity benefits need to be defined.  相似文献   
156.
157.
158.
159.
160.
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