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   99032篇
  免费   1229篇
  国内免费   1135篇
安全科学   3902篇
废物处理   3646篇
环保管理   15047篇
综合类   21514篇
基础理论   27641篇
环境理论   75篇
污染及防治   18853篇
评价与监测   5904篇
社会与环境   4165篇
灾害及防治   649篇
  2022年   828篇
  2021年   815篇
  2020年   665篇
  2019年   879篇
  2018年   1249篇
  2017年   1306篇
  2016年   2267篇
  2015年   1868篇
  2014年   2601篇
  2013年   9288篇
  2012年   2552篇
  2011年   3132篇
  2010年   3425篇
  2009年   3574篇
  2008年   2759篇
  2007年   2666篇
  2006年   2857篇
  2005年   2715篇
  2004年   2997篇
  2003年   2866篇
  2002年   2445篇
  2001年   2910篇
  2000年   2327篇
  1999年   1645篇
  1998年   1417篇
  1997年   1420篇
  1996年   1549篇
  1995年   1637篇
  1994年   1532篇
  1993年   1379篇
  1992年   1376篇
  1991年   1349篇
  1990年   1296篇
  1989年   1277篇
  1988年   1113篇
  1987年   1030篇
  1986年   1010篇
  1985年   1095篇
  1984年   1190篇
  1983年   1194篇
  1982年   1189篇
  1981年   1121篇
  1980年   958篇
  1979年   961篇
  1978年   844篇
  1977年   739篇
  1976年   675篇
  1974年   654篇
  1973年   688篇
  1972年   698篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Waste accumulation is a grave concern and becoming a transboundary challenge for environment. During Covid-19 pandemic, diverse type of waste were collected due to different practices employed in order to fight back the transmission rate of the virus. Covid-19 was proved to be capricious catastrophe of this 20th century and even not completely eradicated from the world. The havoc created by this imperceptible quick witted, pleomorphic deadly virus can't be ignored. Though a number of vaccines have been developed by the scientists but there is a fear of getting this virus again in our life. Medical studies prove that immunity drinks will help to reduce its reoccurrences. Coconut water is widely used among all drinks available globally. Its massive consumption created an incalculable pile of green coconut shells around the different corners of the world. This practice generating enormous problem of space acquisition for the environment. Both the environment and public health will benefit from an evaluation of quantity of coconut waste that is being thrown and its potential to generate value added products. With this context, present article has been planned to study different aspects like, coconut waste generation, its biological properties and environmental hazards associated with its accumulation. Additionally, this review illustrates, green technologies for production of different value added products from coconut waste.  相似文献   
32.
33.
34.
35.
36.
Journal of Material Cycles and Waste Management - The novel COVID-19 pandemic has disrupted the functioning of solid waste management globally as households experience an increase in their waste...  相似文献   
37.
Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainable society. This paper presents a comprehensive list of biogas upgrading technologies focused on carbon dioxide removal as well as recent advances reported by researcher with wide expertise in this topic. Additionally, an extensive costs–performance comparison among the technologies studied is discussed. Among the different alternatives, chemical scrubbing stood out to achieve high biomethane purities while cryogenic technologies proved to be effective against methane losses. Regarding the different costs, water scrubbing and membrane separation seem to be the most affordable techniques.  相似文献   
38.
39.
Journal of Material Cycles and Waste Management - The traditional Chinese medicinal plant Magnolia officinalis has a wide range of applications; including more than 200 kinds of patented Chinese...  相似文献   
40.
Catastrophic disasters like earthquake and flood cause widespread destruction and financial devastation. This has brought disaster management into limelight making it a burgeoning academic research field. The remarkable rise of ICT (Information and Communication Technology) has instigated the scientific world to incorporate these technologies in disaster management. This study presents scientometric analysis to identify the status quo of research on the management of various disasters and role of ICT in it. This paper uses bibliographic data retrieved from Scopus for the observation period from 2011 to 2018. We provide extensive insights into growth of publications, citation pattern and their connectedness with other subject disciplines. Furthermore, we identify most productive and influential countries, institutes and journals. Our study analyses co-occurrence of keywords using Visualization of Similarities (VOS) Viewer. This structured overview will enhance the understanding of this field leading to more focussed and purposeful research.  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