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   256999篇
  免费   16291篇
  国内免费   36147篇
安全科学   23963篇
废物处理   11724篇
环保管理   29929篇
综合类   104538篇
基础理论   48739篇
环境理论   214篇
污染及防治   51079篇
评价与监测   16824篇
社会与环境   15278篇
灾害及防治   7149篇
  2024年   681篇
  2023年   3285篇
  2022年   9048篇
  2021年   9062篇
  2020年   8714篇
  2019年   6824篇
  2018年   7999篇
  2017年   9303篇
  2016年   9335篇
  2015年   9407篇
  2014年   11515篇
  2013年   21358篇
  2012年   16243篇
  2011年   18222篇
  2010年   15968篇
  2009年   15757篇
  2008年   16113篇
  2007年   15817篇
  2006年   14789篇
  2005年   11443篇
  2004年   8892篇
  2003年   7858篇
  2002年   6967篇
  2001年   6321篇
  2000年   5390篇
  1999年   3681篇
  1998年   2472篇
  1997年   2254篇
  1996年   2274篇
  1995年   2364篇
  1994年   2094篇
  1993年   1565篇
  1992年   1572篇
  1991年   1414篇
  1990年   1301篇
  1989年   1193篇
  1988年   1061篇
  1987年   940篇
  1986年   896篇
  1985年   922篇
  1984年   964篇
  1983年   897篇
  1982年   982篇
  1981年   890篇
  1980年   697篇
  1979年   759篇
  1978年   637篇
  1977年   557篇
  1975年   498篇
  1974年   495篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.

We propose a novel framework for the economic assessment of environmental policy. Our main point of departure from existing work is the adoption of a satisficing, as opposed to optimizing, modeling approach. Along these lines, we place primary emphasis on the extent to which different policies meet a set of goals at a specific future date instead of their performance vis-a-vis some intertemporal objective function. Consistent to the nature of environmental policymaking, our model takes explicit account of model uncertainty. To this end, the decision criterion we propose is an analog of the well-known success-probability criterion adapted to settings characterized by model uncertainty. We apply our criterion to the climate-change context and the probability distributions constructed by Drouet et al. (2015) linking carbon budgets to future consumption. Insights from computational geometry facilitate computations considerably and allow for the efficient application of the model in high-dimensional settings.

  相似文献   
32.
Environmental Science and Pollution Research - A yearlong study of odor-active VOCs was carried out in the northwestern district of the city of Thessaloniki, Greece, which is in close vicinity to a...  相似文献   
33.
Environmental Science and Pollution Research - A novel composite (nZVI/Pd-AC) was prepared by loading nanoscale zero-valent iron (nZVI) and Pd on activated carbon (AC) electrode under...  相似文献   
34.
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   
35.
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   
36.
Huang  Ying  Jiang  Qiongji  Yu  Xubiao  Gan  Huihui  Zhu  Xia  Fan  Siyi  Su  Yan  Xu  Zhirui  He  Cunrui 《Environmental science and pollution research international》2021,28(37):51251-51264
Environmental Science and Pollution Research - Trace copper ion (Cu(II)) in water and wastewater can trigger peroxymonosulfate (PMS) activation to oxidize organic compounds, but it only works under...  相似文献   
37.
Environmental Science and Pollution Research - This study aims to re-examine the impacts of monetary and fiscal policy on environmental quality in ASEAN countries from 1990 to 2019. We utilized the...  相似文献   
38.
Environmental Science and Pollution Research - In the paper, the pollution of playgrounds in Lublin with heavy metals was assessed. Since playgrounds are a place of activity of children—the...  相似文献   
39.
Environmental Science and Pollution Research - Rivers engage in carbon cycle by transporting the dissolved products of weathering of rocks to the oceans, and this process is sensitive to the global...  相似文献   
40.
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