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   36772篇
  免费   402篇
  国内免费   504篇
安全科学   1090篇
废物处理   1779篇
环保管理   4210篇
综合类   6101篇
基础理论   9370篇
环境理论   28篇
污染及防治   10059篇
评价与监测   2643篇
社会与环境   2192篇
灾害及防治   206篇
  2023年   204篇
  2022年   512篇
  2021年   539篇
  2020年   342篇
  2019年   382篇
  2018年   745篇
  2017年   736篇
  2016年   1096篇
  2015年   754篇
  2014年   1217篇
  2013年   2953篇
  2012年   1432篇
  2011年   1851篇
  2010年   1476篇
  2009年   1441篇
  2008年   1762篇
  2007年   1808篇
  2006年   1526篇
  2005年   1306篇
  2004年   1238篇
  2003年   1292篇
  2002年   1110篇
  2001年   1338篇
  2000年   919篇
  1999年   572篇
  1998年   372篇
  1997年   385篇
  1996年   382篇
  1995年   463篇
  1994年   473篇
  1993年   373篇
  1992年   387篇
  1991年   369篇
  1990年   398篇
  1989年   352篇
  1988年   304篇
  1987年   288篇
  1986年   233篇
  1985年   264篇
  1984年   273篇
  1983年   264篇
  1982年   251篇
  1981年   228篇
  1980年   179篇
  1979年   201篇
  1978年   180篇
  1975年   145篇
  1974年   120篇
  1972年   133篇
  1971年   134篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Environment, Development and Sustainability - The current study explores the role of green trust, green perceived risk and green perceived quality in changing green purchase intention....  相似文献   
2.
Russian Journal of Ecology - A study of the anthropogenic impacts on the on-shore aggregation of true seals was carried out at a haul-out located at the mouth of Piltun Bay (the northeastern part...  相似文献   
3.
Environmental Science and Pollution Research - Legacy (i.e., polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCDD)) and alternative halogenated flame retardants (HFRs) were...  相似文献   
4.
Environmental Science and Pollution Research - In this work, it was analyzed the behavior of three commercial activated carbons with different textural and chemical properties to adsorb...  相似文献   
5.
Environmental Science and Pollution Research - Heavy metals are well known for their toxicity and become significant environmental pollution with a continually rising technology and public outcry...  相似文献   
6.
Environmental Science and Pollution Research - The Fundão Dam collapsed, on November 5th, 2015, dumping more than 50 million/m3 of iron ore tailings, enriched with metals, into the Doce River...  相似文献   
7.
Environmental Science and Pollution Research - A current environmental problem is the uncontrolled use of various pesticides that are harmful to the environment and public health. The herbicide...  相似文献   
8.
Russian Journal of Ecology - Climate change entails shifts in the ranges of woody plants along both latitudinal and altitudinal gradients in the boreal forest biome. In this study,...  相似文献   
9.
Journal of Material Cycles and Waste Management - Power generation from municipal solid waste plays significant role to mitigate the environmental pollution. The power generation potential of...  相似文献   
10.
The chemical recycling of cellulosic fibres may represent a next-generation fibre–fibre recycling system for cotton textiles, though remaining challenges include how to accommodate fibre blends, dyes, wrinkle-free finishes, and other impurities from finishing. These challenges may disrupt the regeneration process steps and reduce the fibre quality. This study examines the impact on regenerated viscose fibre properties of a novel alkaline/acid bleaching sequence to strip reactive dyes and dimethyloldihydroxyethyleneureas (DMDHEU) wrinkle-free finish from cotton textiles. Potentially, such a bleaching sequence could advantageously be integrated into the viscose process, reducing the costs and environmental impact of the product. The study investigates the spinning performance and mechanical properties (e.g., tenacity and elongation) of the regenerated viscose fibres. The alkaline/acid bleaching sequence was found to strip the reactive dye and DMDHEU wrinkle-free finish from the cotton fabric, so the resulting pulp could successfully be spun into viscose fibres, though the mechanical properties of these fibres were worse than those of commercial viscose fibres. This study finds that reactive dyes and DMDHEU wrinkle-free finish affect the viscose dope quality and the regeneration performance. The results might lead to progress in overcoming quality challenges in cellulosic chemical recycling.  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