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   27056篇
  免费   272篇
  国内免费   222篇
安全科学   730篇
废物处理   1106篇
环保管理   3498篇
综合类   4593篇
基础理论   7298篇
环境理论   15篇
污染及防治   6849篇
评价与监测   1759篇
社会与环境   1529篇
灾害及防治   173篇
  2022年   232篇
  2021年   203篇
  2020年   180篇
  2019年   207篇
  2018年   369篇
  2017年   402篇
  2016年   559篇
  2015年   464篇
  2014年   714篇
  2013年   2064篇
  2012年   851篇
  2011年   1192篇
  2010年   996篇
  2009年   1053篇
  2008年   1189篇
  2007年   1249篇
  2006年   1050篇
  2005年   916篇
  2004年   857篇
  2003年   877篇
  2002年   842篇
  2001年   1057篇
  2000年   773篇
  1999年   452篇
  1998年   300篇
  1997年   356篇
  1996年   361篇
  1995年   417篇
  1994年   408篇
  1993年   328篇
  1992年   328篇
  1991年   338篇
  1990年   346篇
  1989年   333篇
  1988年   266篇
  1987年   268篇
  1986年   269篇
  1985年   238篇
  1984年   251篇
  1983年   237篇
  1982年   233篇
  1981年   221篇
  1980年   199篇
  1979年   229篇
  1978年   165篇
  1977年   181篇
  1975年   152篇
  1974年   144篇
  1973年   157篇
  1972年   144篇
排序方式: 共有10000条查询结果,搜索用时 38 毫秒
101.
Dick B 《Disasters》1985,9(4):259-269
Although there have been a number of recent developments in our understanding of refugee health problems that have influenced policies and action, the effects of refugees on the health status and services of host communities remain relatively neglected. This article sets out to explain why this is an important issue with implications for policy, planning surveillance and evaluation, training and research.
The first sections outline some of the problems facing host governments and communities in Africa and discuss the changing rhetoric between the first and second International Conferences for Assistance to Refugees in Africa. A number of possible ways in which refugees could affect the individual, agent and environmental causes of disease are considered, as are the characteristics of the refugees, the host communities and the response which may all modify this impact.
Policy implications of the impact of the refugees, both negative and positive, are discussed, and detailed consideration is given to the pros and cons of integrated and parallel approaches to health care provision. The need to monitor carefully the health status and services of host communities is emphasized and recommendations are made for this and other essential developments relating to training and research.  相似文献   
102.
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   
103.
Environment, Development and Sustainability - Environmental deterioration and global warming has created a substantial impact on international companies to incorporate eco-friendly, green supply...  相似文献   
104.
Environment, Development and Sustainability - Renewable energy (RE) plays an increasingly important role in the economy of almost every country in the world. In order to examine the state of...  相似文献   
105.
Environment, Development and Sustainability - This study describes the results of groundwater table variation in Thanjavur District before and after the monsoon seasons. Groundwater-level data...  相似文献   
106.
Russian Journal of Ecology - Abstract—We tested a hypothesis about the different abilities of alien and native plants to form arbuscular mycorrhizae. The studies were carried out in the...  相似文献   
107.
Rate-temperature responses in scyphozoan medusae and polyps   总被引:1,自引:0,他引:1  
The effects of temperature on oxygen consumption and spontaneous rhythmic activity have been investigated in various stages of the life histories of 3 species of jellyfish from the Chesapeake Bay, USA. All 3 species clearly show the ability to acclimate positively to temperature change. Thermal sensitivity of metabolism in the winter medusa Cyanea capillata fulva is fairly low at temperature intervals which are experienced in nature. Polyps of the two summer medusae, Chrysaora quinquecirrha and Aurelia aurita, show reduced metabolic sensitivity at temperatures normally accompanying high developmental activity and the onset of strobilation.  相似文献   
108.
109.
110.
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