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   21392篇
  免费   4964篇
  国内免费   28568篇
安全科学   2091篇
废物处理   923篇
环保管理   1676篇
综合类   34718篇
基础理论   3990篇
污染及防治   8172篇
评价与监测   1937篇
社会与环境   629篇
灾害及防治   788篇
  2024年   39篇
  2023年   288篇
  2022年   789篇
  2021年   675篇
  2020年   1183篇
  2019年   2261篇
  2018年   2419篇
  2017年   2529篇
  2016年   2279篇
  2015年   2743篇
  2014年   3482篇
  2013年   3899篇
  2012年   3665篇
  2011年   3244篇
  2010年   2893篇
  2009年   2802篇
  2008年   2600篇
  2007年   2495篇
  2006年   1983篇
  2005年   1467篇
  2004年   1266篇
  2003年   1076篇
  2002年   937篇
  2001年   916篇
  2000年   1035篇
  1999年   926篇
  1998年   682篇
  1997年   640篇
  1996年   644篇
  1995年   579篇
  1994年   394篇
  1993年   321篇
  1992年   381篇
  1991年   328篇
  1990年   251篇
  1989年   219篇
  1988年   155篇
  1987年   81篇
  1986年   83篇
  1985年   57篇
  1984年   58篇
  1983年   43篇
  1982年   49篇
  1981年   36篇
  1979年   4篇
  1978年   4篇
  1976年   3篇
  1973年   3篇
  1972年   8篇
  1971年   5篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Environmental Science and Pollution Research - The existing literature on the environmental Kuznets curve (EKC) fails to investigate the spatial attribute of the “pollution halo” effect...  相似文献   
2.
Environmental Science and Pollution Research - Growing environmental pressure urges China to develop in a sustainable and low carbon way, and thus China strives to achieve a carbon peak by 2030 and...  相似文献   
3.
Environmental Science and Pollution Research - At present, the contradiction between survival and ecology necessitates the integration of crop planting, chemical fertilizer application, and...  相似文献   
4.
Environmental Science and Pollution Research - Hydrothermal liquefaction (HTL) of biomass used HTL reaction under high temperature and pressure to produce bio-oil. This technology is considered as...  相似文献   
5.
Yan  Mi  He  Lei  Prabowo  Bayu  Fang  Zhumin  Lin  Jie  Xu  Zhang  Hu  Yanjun 《Journal of Material Cycles and Waste Management》2018,20(3):1594-1604
Journal of Material Cycles and Waste Management - Efforts to improve the performance of hydrothermal treatment (HT) in producing high-quality solid fuel from sewage sludge were carried out by...  相似文献   
6.
Wildlife provides food, medicine, clothing, and other necessities for humans, but overexploitation can disrupt the sustainability of wildlife resources and severely threaten global biodiversity. Understanding the characteristics of consumer behavior is helpful for wildlife managers and policy makers, but the traditional survey methods are laborious and time-consuming. In contrast, culturomics may more efficiently identify the features of wildlife consumption. As a case study of the culturomics approach, we examined tiger bone wine consumption in China based on social media and Baidu search engine data. Tiger bone wine is one of the most purchased tiger products; its consumption is closely related to tiger poaching, which greatly threatens wild tiger survival. We searched a popular social media website for the term “tiger bone wine” and focused on posts that were originally created from 1 January 2012 to 31 December 2018. We filtered and classified posts related to the purchase, sale, or consumption of tiger bone wine and extracted information on providers, consumption motivations, year of production, and place of origin of the tiger bone wines based on the texts and photos of these posts. We found 756 posts related to tiger bone wine consumption, 113 of which mentioned providers of tiger bone wine, including friends (53%), elder relatives (37%), peer relatives (7%), and others (3%). Out of the 756 posts, 266 indicated the motivations of tiger bone wine consumption. Tiger bone wines were consumed as a tonic (34%), medicine (23%), game product (30%), and a symbol of wealth (28%). Some posts indicated ≥2 consumption motivations. These findings were consistent with the search queries from Baidu index. Such information could help develop targeted strategies for tiger conservation. The culturomics approach illustrated by our study is a rapid and cost-efficient way to characterize wildlife consumption.  相似文献   
7.
本文从医学测试、体质测试和心理测试三个方面论述了消防员职业健康测试项目研究的重要性,以促进我国消防员职业健康研究水平的提高。  相似文献   
8.
9.
10.
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