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   30773篇
  免费   193篇
  国内免费   204篇
安全科学   556篇
废物处理   1775篇
环保管理   3704篇
综合类   3620篇
基础理论   8651篇
环境理论   4篇
污染及防治   7330篇
评价与监测   2659篇
社会与环境   2739篇
灾害及防治   132篇
  2023年   93篇
  2022年   217篇
  2021年   220篇
  2020年   143篇
  2019年   181篇
  2018年   1795篇
  2017年   1700篇
  2016年   1684篇
  2015年   484篇
  2014年   600篇
  2013年   1784篇
  2012年   1145篇
  2011年   2238篇
  2010年   1559篇
  2009年   1433篇
  2008年   1852篇
  2007年   2320篇
  2006年   890篇
  2005年   807篇
  2004年   779篇
  2003年   837篇
  2002年   854篇
  2001年   945篇
  2000年   651篇
  1999年   403篇
  1998年   300篇
  1997年   249篇
  1996年   294篇
  1995年   272篇
  1994年   251篇
  1993年   239篇
  1992年   247篇
  1991年   212篇
  1990年   218篇
  1989年   224篇
  1988年   199篇
  1987年   162篇
  1986年   127篇
  1985年   142篇
  1984年   185篇
  1983年   165篇
  1982年   196篇
  1981年   138篇
  1980年   122篇
  1979年   156篇
  1978年   118篇
  1977年   108篇
  1976年   100篇
  1975年   83篇
  1974年   88篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
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   
2.
This article postulates strong endogenous relationships in lower income countries between institutional quality, financial development and sustained economic growth. These associations were investigated using the vector-error correction model (VECM) and Granger causality method for a sample of 79 countries from 2005 to 2022. The findings show that (1) these variables reinforce each other in the short run. (2) In the long run, both institutional quality and financial development can fuel economic growth. (3) The positive effect of institutional quality on economic growth is greater than that of financial development. Policy implications of these findings are that careful attention should be paid to co-development policies to enhance the institutional quality and the financial system in these economies. Policies should also consider economic growth strategies to enable sustainable economic growth rates.  相似文献   
3.
The Science of Nature - We present the first study that compares phenological variation in parasite load and inflammatory response in a lizard with asynchronous male and female gonadal cycles....  相似文献   
4.
5.
6.
The purpose of the research is to identify the critical challenges that are impeding the adoption of e-mobility in India. It also aims to give a roadmap how to address these challenges while taking into considerations concerns of all the relevant stakeholders. Based on an in-depth literature review, an exploratory research design is employed to delve deep into various aspects of e-mobility. This is followed by a three-phase Delphi technique to identify and rate the e-mobility challenges in the Indian context. The study successfully identifies four different categories of challenges and proposes integrative framework for e-mobility. Further, the research goes on to lay out the future roadmap for mass adoption of electric vehicles (EVs) in India. The research is novel in terms of presenting a holistic viewpoint on e-mobility in India. Its originality lies in identifying the major inhibitors obstructing EVs adoption in India and then suggesting the roadmap how to overcome these impediments for mass adoption of e-mobility.  相似文献   
7.
8.
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   
9.
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   
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