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   1647篇
  免费   39篇
  国内免费   68篇
安全科学   63篇
废物处理   176篇
环保管理   202篇
综合类   224篇
基础理论   400篇
环境理论   4篇
污染及防治   472篇
评价与监测   102篇
社会与环境   94篇
灾害及防治   17篇
  2023年   8篇
  2022年   42篇
  2021年   19篇
  2020年   20篇
  2019年   28篇
  2018年   92篇
  2017年   40篇
  2016年   73篇
  2015年   70篇
  2014年   46篇
  2013年   113篇
  2012年   55篇
  2011年   100篇
  2010年   82篇
  2009年   91篇
  2008年   86篇
  2007年   119篇
  2006年   87篇
  2005年   56篇
  2004年   87篇
  2003年   60篇
  2002年   45篇
  2001年   99篇
  2000年   40篇
  1999年   24篇
  1998年   14篇
  1997年   14篇
  1996年   17篇
  1995年   12篇
  1994年   9篇
  1993年   7篇
  1992年   7篇
  1991年   11篇
  1990年   7篇
  1989年   7篇
  1988年   5篇
  1986年   7篇
  1981年   3篇
  1972年   2篇
  1971年   2篇
  1964年   2篇
  1961年   3篇
  1960年   2篇
  1959年   2篇
  1958年   2篇
  1957年   5篇
  1955年   5篇
  1954年   2篇
  1951年   2篇
  1940年   2篇
排序方式: 共有1754条查询结果,搜索用时 15 毫秒
131.
This paper is concerned with the failure of published research to provide a framework within which local technology policy could be analysed and evaluated. It firstly describes a simple model of the technological development process. Then, using this model as a base, develops a framework for analysing the main aspects of technological policies. The paper considers the main results of a recent survey of local authority technology development policies and initiatives before providing some overall conclusions relating to the nature, direction and likely effectiveness of such policies.  相似文献   
132.
133.
134.
This study examined the influence of organizational justice perceptions on employee work outcome relationships as moderated by individual differences that are influenced by societal culture. Power distance, but not country or individualism, moderated the relationships between perceived justice and satisfaction, performance, and absenteeism. The effects of perceived justice on these outcomes were stronger among individuals scoring lower on power distance index, and most of these study participants were in the U.S. (versus Hong Kong) sample. Limitations of the study and the implications of the findings for managing cross‐culturally are discussed. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   
135.
136.
137.
138.
139.
140.
Animal-sediment relations and community analysis of a Florida estuary   总被引:3,自引:0,他引:3  
Five species assemblages of the intertidal infauna of Old Tampa Bay, Florida, USA are identified. Two assemblages are judged to constitute distinct communities, while a third is shown to be an interdigitation of the two communities. Dominance by on species is the prevalent pattern within the assemblages. Numbers of deposit feeders are found to be inversely correlated to that of filter feeders, and both trophic types are found to be correlated to the sediment parameters of median grain size, sorting and skewness. Three transects with three stations each were established along the south side of Courtney Campbell Causeway in Tampa Bay, Florida. A faunal sample (0.4 m2), a sediment sample, and a water sample were taken at each station in September, December, and March of 1968/1969. Sediment samples were wet-seived. Animal samples were reduced to numbers of organisms and biomass per species. Trellis diagrams and correlation tests were generated. Support is shown for the trophic group-amensalims hypothesis, however, the silt-clay fraction is apparently of lesser importance to deposit feeders in Florida sediments than in Buzzards Bay sediments. An attempt is made to relate an analysis of the optimal grain size for filter feeders to the trophic group-amensalism hypothesis. A view of communities as abstractions from continua is more realistic than communities as discrete units.  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