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   277篇
  免费   6篇
安全科学   16篇
废物处理   7篇
环保管理   80篇
综合类   34篇
基础理论   54篇
污染及防治   60篇
评价与监测   17篇
社会与环境   8篇
灾害及防治   7篇
  2023年   3篇
  2022年   2篇
  2021年   3篇
  2019年   7篇
  2018年   2篇
  2017年   8篇
  2016年   7篇
  2015年   7篇
  2014年   6篇
  2013年   29篇
  2012年   7篇
  2011年   14篇
  2010年   8篇
  2009年   7篇
  2008年   15篇
  2007年   16篇
  2006年   10篇
  2005年   8篇
  2004年   9篇
  2003年   10篇
  2002年   5篇
  2001年   9篇
  2000年   8篇
  1999年   10篇
  1998年   9篇
  1997年   4篇
  1996年   4篇
  1995年   4篇
  1994年   1篇
  1992年   1篇
  1991年   3篇
  1990年   2篇
  1989年   5篇
  1988年   1篇
  1987年   2篇
  1986年   3篇
  1985年   4篇
  1984年   3篇
  1983年   2篇
  1982年   1篇
  1980年   1篇
  1979年   5篇
  1978年   1篇
  1977年   4篇
  1975年   5篇
  1974年   2篇
  1973年   1篇
  1972年   1篇
  1970年   2篇
  1964年   1篇
排序方式: 共有283条查询结果,搜索用时 31 毫秒
281.
This article examines the opportunities for fostering sustainable development through public sector sourcing from small- and medium-sized enterprises (SMEs). Buying from small businesses can make such contributions in a variety of forms, ranging from a contribution to local economic development through providing innovative green products and services, particularly in the food sector, to helping the public sector organisation to better align its operations with its community. Sourcing from small businesses also has implications for the governance of sourcing processes and can benefit from a partnership approach. Barriers to public sector sourcing from small businesses are discussed and suggestions made on how these can be overcome.  相似文献   
282.
Social capacity building for natural hazards is a topic increasingly gaining relevance not only for so-called developing countries but also for European welfare states which are continuously challenged by the social, economic and ecological impacts of natural hazards. Following an outline of recent governance changes with regard to natural hazards, we develop a heuristic model of social capacity building by taking into account a wide range of existing expertise from different fields of research. Particular attention is paid to social vulnerability and its assessment, as well as to risk communication and risk education as specific strategies of social capacity building. We propose to distinguish between interventionist and participatory approaches, thus enabling for a better understanding of existing practices of social capacity building as well as their particular strengths and weaknesses. By way of conclusion, we encourage more research on social capacity building for natural hazards in the European context which at present is highly diverse and, at least in parts, only poorly investigated.  相似文献   
283.
During the summers of 2002 and 2004, in-stream integrated flow and concentration measurements for the total dissolved solids in the Cheyenne River, South Dakota, USA was conducted in order to compare the obtained actual field measurements with the predictions values made by the Bureau of Reclamation in the Environmental Impact Statement. In comparison to the actual field measurements conducted in this study, The Bureau of Reclamation extension of a small database used in the analysis for the impact of operations at the Angostura Unit over the past 50 years and into the future to predict the annual total dissolved solid loadings doesn't represent the actual loading values and various conditions in the study area. Additional integrated flow and concentration sampling is required to characterize the impact of the current Angostura Dam operations and Angostura Irrigation District return flows on the Cheyenne River in different seasons of the year.  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