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   94557篇
  免费   1577篇
  国内免费   4646篇
安全科学   4306篇
废物处理   3690篇
环保管理   14054篇
综合类   25950篇
基础理论   27003篇
环境理论   74篇
污染及防治   15783篇
评价与监测   5491篇
社会与环境   3547篇
灾害及防治   882篇
  2022年   1214篇
  2021年   1168篇
  2020年   919篇
  2019年   1111篇
  2018年   1368篇
  2017年   1520篇
  2016年   2481篇
  2015年   2335篇
  2014年   3334篇
  2013年   10165篇
  2012年   2828篇
  2011年   2896篇
  2010年   3796篇
  2009年   3892篇
  2008年   2254篇
  2007年   1928篇
  2006年   2369篇
  2005年   2307篇
  2004年   2571篇
  2003年   2445篇
  2002年   1960篇
  2001年   2201篇
  2000年   2089篇
  1999年   1672篇
  1998年   1585篇
  1997年   1557篇
  1996年   1660篇
  1995年   1705篇
  1994年   1554篇
  1993年   1417篇
  1992年   1370篇
  1991年   1327篇
  1990年   1252篇
  1989年   1197篇
  1988年   1034篇
  1987年   958篇
  1986年   996篇
  1985年   1057篇
  1984年   1152篇
  1983年   1166篇
  1982年   1175篇
  1981年   1095篇
  1980年   933篇
  1979年   908篇
  1978年   815篇
  1977年   706篇
  1976年   632篇
  1975年   591篇
  1973年   614篇
  1972年   619篇
排序方式: 共有10000条查询结果,搜索用时 171 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.
Russian Journal of Ecology - The dynamics of the species richness, breeding density, and structure of the community of birds occupying nest-boxes upon a 50-fold reduction of atmospheric emissions...  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 - 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   
5.
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   
6.
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   
7.
Russian Journal of Ecology - In this paper, Ellenberg’s indicator values were estimated in order to soil nitrogen (N), pH (R) and soil moisture (M) in different subalpine grassland...  相似文献   
8.
Environmental Science and Pollution Research - Nutrient source and transport study in tropical creeks adjacent to megacities are sparse on a regional and global scale. High-frequency chemical data...  相似文献   
9.
Catalytic activity of spinel ferrite in breaking down toxic dye materials are promising due to their uniqueness. In this study, aluminum-doped copper zinc ferrite, Cu0.4Zn0.6-xAlxFe2O4 (x = 0.0, 0.2, 0.4, 0.6), a catalyst for toxic dye degradation is synthesized through chemical co-precipitation route. The formation of the spinel ferrite catalyst is initially confirmed by Fourier transform infrared spectra, which shows the frequency of metal-oxygen bond vibration at 539 and 427 cm−1 attributed to the tetrahedral and octahedral sites respectively. Higher intensity sharp peak of X-ray diffraction for (311) plane is the evidence for the phase purity and the formation of spinel ferrite. The crystallite size is found to decrease with the increase of Al3+ ion. The surface structure of the obtained particles is investigated using a scanning electron microscope. Analyses of the material's magnetic characteristics using a vibrating sample magnetometer (VSM) revealed that it is, in fact, a soft magnet, as evidenced by the loop of its hysteresis, which is narrow. The catalytic degradation of methylene blue dye under the mechanism of the photo-Fenton process is studied with the obtained spinel ferrites and the result is found to be as high as 96.5%. The process follows pseudo-second order kinetics and the Langmuir isotherm.  相似文献   
10.
Russian Journal of Ecology - A new method for assessing the response of biota to climatic changes in the ecosystem has been tested. In the Central Forest Natural Biosphere Reserve, the average...  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