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   89456篇
  免费   1232篇
  国内免费   1096篇
安全科学   3578篇
废物处理   3225篇
环保管理   13848篇
综合类   21130篇
基础理论   26222篇
环境理论   75篇
污染及防治   14106篇
评价与监测   5429篇
社会与环境   3633篇
灾害及防治   538篇
  2022年   735篇
  2021年   804篇
  2020年   647篇
  2019年   865篇
  2018年   1127篇
  2017年   1178篇
  2016年   2148篇
  2015年   1840篇
  2014年   2585篇
  2013年   9251篇
  2012年   2174篇
  2011年   2400篇
  2010年   3254篇
  2009年   3423篇
  2008年   1953篇
  2007年   1795篇
  2006年   2223篇
  2005年   2216篇
  2004年   2491篇
  2003年   2357篇
  2002年   1884篇
  2001年   2104篇
  2000年   1905篇
  1999年   1424篇
  1998年   1332篇
  1997年   1313篇
  1996年   1444篇
  1995年   1575篇
  1994年   1469篇
  1993年   1304篇
  1992年   1310篇
  1991年   1279篇
  1990年   1233篇
  1989年   1200篇
  1988年   1034篇
  1987年   969篇
  1986年   992篇
  1985年   1060篇
  1984年   1151篇
  1983年   1176篇
  1982年   1175篇
  1981年   1097篇
  1980年   941篇
  1979年   929篇
  1978年   817篇
  1977年   720篇
  1976年   638篇
  1975年   611篇
  1973年   637篇
  1972年   650篇
排序方式: 共有10000条查询结果,搜索用时 31 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 - 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.
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   
4.
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   
5.
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   
6.
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   
7.
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   
8.
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   
9.
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   
10.
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   
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