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   89231篇
  免费   1231篇
  国内免费   1153篇
安全科学   3699篇
废物处理   3246篇
环保管理   13909篇
综合类   21164篇
基础理论   26144篇
环境理论   72篇
污染及防治   14181篇
评价与监测   5347篇
社会与环境   3333篇
灾害及防治   520篇
  2022年   741篇
  2021年   815篇
  2020年   646篇
  2019年   884篇
  2018年   1126篇
  2017年   1143篇
  2016年   2159篇
  2015年   1838篇
  2014年   2600篇
  2013年   9310篇
  2012年   2170篇
  2011年   2344篇
  2010年   3239篇
  2009年   3406篇
  2008年   1862篇
  2007年   1706篇
  2006年   2194篇
  2005年   2158篇
  2004年   2501篇
  2003年   2353篇
  2002年   1878篇
  2001年   2135篇
  2000年   1918篇
  1999年   1465篇
  1998年   1364篇
  1997年   1308篇
  1996年   1443篇
  1995年   1570篇
  1994年   1461篇
  1993年   1317篇
  1992年   1309篇
  1991年   1277篇
  1990年   1236篇
  1989年   1196篇
  1988年   1044篇
  1987年   978篇
  1986年   993篇
  1985年   1063篇
  1984年   1155篇
  1983年   1171篇
  1982年   1171篇
  1981年   1093篇
  1980年   940篇
  1979年   920篇
  1978年   820篇
  1977年   718篇
  1976年   649篇
  1975年   610篇
  1973年   640篇
  1972年   645篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
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   
62.
Environmental Economics and Policy Studies - Streets are an essential element of cities, and their design has a profound impact on their functionality to the movement of people and their...  相似文献   
63.
Journal of Material Cycles and Waste Management - Material flow analysis (MFA) is a well-established tool for supporting decisions on nutrient management. This paper shows the importance of the...  相似文献   
64.
65.
66.
67.
68.
69.
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   
70.
Developers are often required by law to offset environmental impacts through targeted conservation actions. Most offset policies specify metrics for calculating offset requirements, usually by assessing vegetation condition. Despite widespread use, there is little evidence to support the effectiveness of vegetation-based metrics for ensuring biodiversity persistence. We compared long-term impacts of biodiversity offsetting based on area only; vegetation condition only; area × habitat suitability; and condition × habitat suitability in development and restoration simulations for the Hunter Region of New South Wales, Australia. We simulated development and subsequent offsetting through restoration within a virtual landscape, linking simulations to population viability models for 3 species. Habitat gains did not ensure species persistence. No net loss was achieved when performance of offsetting was assessed in terms of amount of habitat restored, but not when outcomes were assessed in terms of persistence. Maintenance of persistence occurred more often when impacts were avoided, giving further support to better enforce the avoidance stage of the mitigation hierarchy. When development affected areas of high habitat quality for species, persistence could not be guaranteed. Therefore, species must be more explicitly accounted for in offsets, rather than just vegetation or habitat alone. Declines due to a failure to account directly for species population dynamics and connectivity overshadowed the benefits delivered by producing large areas of high-quality habitat. Our modeling framework showed that the benefits delivered by offsets are species specific and that simple vegetation-based metrics can give misguided impressions on how well biodiversity offsets achieve no net loss.  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