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   87336篇
  免费   1254篇
  国内免费   1266篇
安全科学   3661篇
废物处理   3136篇
环保管理   13558篇
综合类   21135篇
基础理论   25895篇
环境理论   73篇
污染及防治   13058篇
评价与监测   5223篇
社会与环境   3601篇
灾害及防治   516篇
  2022年   811篇
  2021年   805篇
  2020年   660篇
  2019年   873篇
  2018年   1125篇
  2017年   1165篇
  2016年   2135篇
  2015年   1849篇
  2014年   2579篇
  2013年   9247篇
  2012年   2061篇
  2011年   2220篇
  2010年   3220篇
  2009年   3364篇
  2008年   1732篇
  2007年   1558篇
  2006年   2003篇
  2005年   2107篇
  2004年   2382篇
  2003年   2215篇
  2002年   1758篇
  2001年   2011篇
  2000年   1838篇
  1999年   1433篇
  1998年   1351篇
  1997年   1344篇
  1996年   1472篇
  1995年   1553篇
  1994年   1450篇
  1993年   1308篇
  1992年   1289篇
  1991年   1268篇
  1990年   1214篇
  1989年   1188篇
  1988年   1018篇
  1987年   972篇
  1986年   983篇
  1985年   1056篇
  1984年   1151篇
  1983年   1158篇
  1982年   1170篇
  1981年   1093篇
  1980年   937篇
  1979年   909篇
  1978年   815篇
  1977年   711篇
  1976年   639篇
  1975年   594篇
  1973年   619篇
  1972年   623篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
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   
22.
23.
24.
25.
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   
26.
27.
Journal of Material Cycles and Waste Management - The present research work focused on fabricating Biodegradable Plate (BD plate) composed of rice husk ash, bagasse and corn starch which is...  相似文献   
28.
29.
Quantitative methods have been applied to the study of floristic structure and diversity in Samarskaya Luka. The results show that Samarskaya Luka is a floristically heterogeneous area in which six elementary floras can be distinguished. This area has been assessed as a floristically autonomous formation, and its floristic representativeness was estimated.  相似文献   
30.
Abstract:  Introduction of artificial light into wildlife habitat represents a rapidly expanding form of human encroachment, particularly in coastal systems. Light pollution alters the behavior of sea turtles during nesting; therefore, long-wavelength lights—low-pressure sodium vapor and bug lights—that minimize impacts on turtles are required for beach lighting in Florida (U.S.A.). We investigated the effects of these two kinds of lights on the foraging behavior of Santa Rosa beach mice (  Peromyscus polionotus leucocephalus ). We compared patch use and giving-up densities of mice for experimental food patches established along a gradient of artificial light in the field. Mice exploited fewer food patches near both types of artificial light than in areas with little light and harvested fewer seeds within patches near bug lights. Our results show that artificial light affects the behavior of terrestrial species in coastal areas and that light pollution deserves greater consideration in conservation planning.  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