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   38785篇
  免费   699篇
  国内免费   4610篇
安全科学   1479篇
废物处理   1883篇
环保管理   4088篇
综合类   13891篇
基础理论   7777篇
环境理论   13篇
污染及防治   10856篇
评价与监测   1907篇
社会与环境   1523篇
灾害及防治   677篇
  2023年   283篇
  2022年   760篇
  2021年   648篇
  2020年   468篇
  2019年   513篇
  2018年   785篇
  2017年   856篇
  2016年   991篇
  2015年   1060篇
  2014年   1486篇
  2013年   3113篇
  2012年   1656篇
  2011年   2077篇
  2010年   1627篇
  2009年   1713篇
  2008年   1811篇
  2007年   1695篇
  2006年   1551篇
  2005年   1249篇
  2004年   1147篇
  2003年   1204篇
  2002年   1107篇
  2001年   1257篇
  2000年   1021篇
  1999年   858篇
  1998年   627篇
  1997年   610篇
  1996年   579篇
  1995年   619篇
  1994年   541篇
  1993年   469篇
  1992年   441篇
  1991年   450篇
  1990年   415篇
  1989年   391篇
  1988年   337篇
  1987年   292篇
  1986年   271篇
  1985年   269篇
  1984年   309篇
  1983年   292篇
  1982年   300篇
  1981年   280篇
  1980年   242篇
  1979年   264篇
  1978年   221篇
  1977年   203篇
  1974年   220篇
  1967年   229篇
  1965年   201篇
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
91.
Green RH 《Disasters》1986,10(4):288-302
Frustrations and failures will continue to mount if we do not immediately summon the courage to revise the ways we think and take action-as well as maintaining essential services to support life and health … Saving hundreds of thousands … who are at risk of dying from malnutrition or infection is an immediate imperative. But it must be only one stage in the progress toward other activities, and one element in the truly comprehensive approach… The main intent of this paper is to explore aspects of the nature and evolution of poverty in Sub-Saharan Africa with special reference to food and hunger and their interaction with macro-economic policy. An attempt is made to outline the overall context within which food aid needs to be used in order to have a greater developmental impact. Following an Introductory Section I, Section II provides a sketch map of how recession and lagging food production - with cyclical weather crises superimposed - affect the human condition of poor people. Section III reviews die interaction between "standard" IMF stabilization and World Bank structural adjustment strategies and poverty/hunger. Improvements in the design of stabilization and adjustment programmes, and of the inter-relationship with them of emergency programmes, can be identified. A number turn on the broadened and more innovative or catalytic use of food aid. Section IV reviews aspects of facing a continuing series of emergencies and of designing life support programmes to facilitate rehabilitation of the households directly affected as well as of the national economies. From this base it explores a series of elements in achieving renewed development. The concluding Section seeks to explore the strengths, limitations and potentials of food aid in the context set by the previous sections. The standard criticisms of food aid appear to be overstated and/or to relate to particular modalities or approaches rather than to anything intrinsic. A number of criteria for improving the effectiveness of food aid - especially in respect to rehabilitation, recovery and renewed development - are set out.  相似文献   
92.
Simmonds S  Cuttst F  Dick B 《Disasters》1985,9(1):61-69
Many problems have been encountered in the planning and implementation of health care in refugee camps, and more specifically in the training of refugees as primary health care workers. A review of the published literature and a "survey" of the opinions and experiences of refugee, national and international health personnel regarding training has therefore been undertaken to provide an overview of what has been done and to make recommendations for future work.
The review highlights the need to reallocate resources away from high visibility emergency aid to development activities, such as training, that will create an infrastructure for primary health care and promote self-reliance.  相似文献   
93.
Environment, Development and Sustainability - This study analyzes the evolution of the land use structure, demographic reconstruction, and social reconstruction of Dachangshan Island, Changhai...  相似文献   
94.
Environment, Development and Sustainability - The PPP mode of rural water environment governance was conducive to attracting social capital for giving full play to the decisive role of the market...  相似文献   
95.
96.
Yao Huifang  Duo  Zhang  Jie  Lu  Chao  Wang  Deshui  Yu 《Russian Journal of Ecology》2022,53(4):308-317
Russian Journal of Ecology - The aim of this study is to explore the effects of the litter cover thickness and cleaning methods on seed germination and seedling growth of Pinus densata. The overall...  相似文献   
97.
Environment, Development and Sustainability - Heavy metal pollution has attracted more attention due to the toxicity and migration characteristics, which has close relationship with soil...  相似文献   
98.
99.
100.
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