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   765篇
  免费   37篇
  国内免费   92篇
安全科学   40篇
废物处理   18篇
环保管理   53篇
综合类   625篇
基础理论   75篇
污染及防治   47篇
评价与监测   24篇
社会与环境   9篇
灾害及防治   3篇
  2024年   1篇
  2023年   5篇
  2022年   10篇
  2021年   10篇
  2020年   6篇
  2019年   10篇
  2018年   11篇
  2017年   16篇
  2016年   12篇
  2015年   27篇
  2014年   26篇
  2013年   30篇
  2012年   34篇
  2011年   77篇
  2010年   57篇
  2009年   68篇
  2008年   57篇
  2007年   48篇
  2006年   49篇
  2005年   48篇
  2004年   33篇
  2003年   50篇
  2002年   50篇
  2001年   31篇
  2000年   7篇
  1999年   10篇
  1998年   3篇
  1997年   6篇
  1996年   6篇
  1995年   21篇
  1994年   31篇
  1993年   19篇
  1992年   7篇
  1991年   5篇
  1990年   4篇
  1989年   1篇
  1987年   3篇
  1985年   1篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1979年   1篇
排序方式: 共有894条查询结果,搜索用时 15 毫秒
1.
RAMP I is a screening tool developed to support practitioners in screening for work-related musculoskeletal disorder risk factors related to manual handling. RAMP I, which is part of the RAMP tool, is based on research-based studies combined with expert group judgments. More than 80 practitioners participated in the development of RAMP I. The tool consists of dichotomous assessment items grouped into seven categories. Acceptable reliability was found for a majority of the assessment items for 15 practitioners who were given 1?h of training. The usability evaluation points to RAMP I being usable for screening for musculoskeletal disorder risk factors, i.e., usable for assessing risks, being usable as a decision base, having clear results and that the time needed for an assessment is acceptable. It is concluded that RAMP I is a usable tool for practitioners.  相似文献   
2.
Developers are often required by law to offset environmental impacts through targeted conservation actions. Most offset policies specify metrics for calculating offset requirements, usually by assessing vegetation condition. Despite widespread use, there is little evidence to support the effectiveness of vegetation-based metrics for ensuring biodiversity persistence. We compared long-term impacts of biodiversity offsetting based on area only; vegetation condition only; area × habitat suitability; and condition × habitat suitability in development and restoration simulations for the Hunter Region of New South Wales, Australia. We simulated development and subsequent offsetting through restoration within a virtual landscape, linking simulations to population viability models for 3 species. Habitat gains did not ensure species persistence. No net loss was achieved when performance of offsetting was assessed in terms of amount of habitat restored, but not when outcomes were assessed in terms of persistence. Maintenance of persistence occurred more often when impacts were avoided, giving further support to better enforce the avoidance stage of the mitigation hierarchy. When development affected areas of high habitat quality for species, persistence could not be guaranteed. Therefore, species must be more explicitly accounted for in offsets, rather than just vegetation or habitat alone. Declines due to a failure to account directly for species population dynamics and connectivity overshadowed the benefits delivered by producing large areas of high-quality habitat. Our modeling framework showed that the benefits delivered by offsets are species specific and that simple vegetation-based metrics can give misguided impressions on how well biodiversity offsets achieve no net loss.  相似文献   
3.
4.
5.
6.
7.
8.
9.
10.
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