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   458篇
  免费   1篇
  国内免费   2篇
安全科学   6篇
废物处理   10篇
环保管理   23篇
综合类   116篇
基础理论   140篇
污染及防治   143篇
评价与监测   11篇
社会与环境   11篇
灾害及防治   1篇
  2021年   2篇
  2018年   5篇
  2016年   2篇
  2015年   2篇
  2014年   5篇
  2013年   14篇
  2012年   18篇
  2011年   19篇
  2010年   12篇
  2009年   27篇
  2008年   19篇
  2007年   24篇
  2006年   26篇
  2005年   15篇
  2004年   13篇
  2003年   23篇
  2002年   12篇
  2001年   9篇
  2000年   20篇
  1999年   25篇
  1998年   19篇
  1997年   18篇
  1996年   17篇
  1995年   13篇
  1994年   8篇
  1993年   12篇
  1992年   3篇
  1990年   3篇
  1989年   4篇
  1988年   3篇
  1987年   2篇
  1986年   4篇
  1983年   2篇
  1982年   3篇
  1981年   3篇
  1979年   2篇
  1978年   4篇
  1977年   2篇
  1974年   2篇
  1970年   2篇
  1967年   4篇
  1966年   2篇
  1965年   4篇
  1961年   2篇
  1958年   2篇
  1956年   2篇
  1955年   3篇
  1952年   2篇
  1949年   2篇
  1922年   1篇
排序方式: 共有461条查询结果,搜索用时 15 毫秒
1.
Within the limits of a feasability study abouton-site bioremediation methods for TNT-contaminated soils, composting was chosen as a very promising and cheap method. This method was critically compared with those described in the literature and was primarily rated under ecotoxicological aspects. The investigated location is the former munition plant «Tanne» in the aerea of Clausthal-Zellerfeld in Lower Saxony, Germany. To estimate the autochtonic microflora, we assessed the number of aerobic heterotrophic bacteria and determined their respiration activity in soils. In addition, we isolated bacteria and examined their capacity to metabolize TNTin vitro. Both the amount of autochtonic microrganisms (4.7×108 to 1.2×1010 colony forming units (cfu)/kg dryweight) as well as their respiration activity did not correlate with the concentrations of nitrotoluenes in the soils. With high contaminated soil (20 g TNT/kg dry weight) we carried out a small compost in the range of 10 liters. During 28 days of composting TNT-concentration decrease over 90% and only minor amounts of monoaminodinitrotoluenes were generated. However, an acidic pretreatment of the compost material at the end of the reaction showed that TNT could be partially resolved under these extreme conditions and that an ecotoxicological risk may still exist. Possible changes in the realization of the composting process in order to make sure that the contaminants are savely bound to the humin matrix are discussed.  相似文献   
2.
3.
We present a planning framework that structures thelarge amount of interrelated information involved indeveloping regional monitoring programs. By regionalwe mean programs that recognize the importance ofprocesses that occur on larger geographic scales andthat cut across more than one ecosystem component. Theframework helps visualize functional relationshipsamong qualitative ingredients such as public concernsand more concrete details such as individual dataelements. It portrays the flow of information amongthe components of a regional program and ties eachaspect of the program to management decision-makingneeds. This makes it easier, during the planningprocess, to ensure that monitoring will actuallyproduce useful information. Further, the frameworksnovel, graphically oriented, and readily accessibleformat makes key information equally available to thewide range of participants (regulators, scientists,managers, public) whose input and support arenecessary for program success.  相似文献   
4.
5.
6.
7.
8.
9.
10.
Climate change and sea level rise (SLR) pose risks to coastal communities around the world, but societal understanding of the distributional and equity implications of SLR impacts and adaptation actions remains limited. Here, we apply a new analytic tool to identify geographic areas in the contiguous United States that may be more likely to experience disproportionate impacts of SLR, and to determine if and where socially vulnerable populations would bear disproportionate costs of adaptation. We use the Social Vulnerability Index (SoVI) to identify socially vulnerable coastal communities, and combine this with output from a SLR coastal property model that evaluates threats of inundation and the economic efficiency of adaptation approaches to respond to those threats. Results show that under the mid-SLR scenario (66.9 cm by 2100), approximately 1,630,000 people are potentially affected by SLR. Of these, 332,000 (~20%) are among the most socially vulnerable. The analysis also finds that areas of higher social vulnerability are much more likely to be abandoned than protected in response to SLR. This finding is particularly true in the Gulf region of the United States, where over 99% of the most socially vulnerable people live in areas unlikely to be protected from inundation, in stark contrast to the least socially vulnerable group, where only 8% live in areas unlikely to be protected. Our results demonstrate the importance of considering the equity and environmental justice implications of SLR in climate change policy analysis and coastal adaptation planning.  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