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   5221篇
  免费   86篇
  国内免费   187篇
安全科学   151篇
废物处理   323篇
环保管理   336篇
综合类   1119篇
基础理论   1045篇
环境理论   4篇
污染及防治   1718篇
评价与监测   453篇
社会与环境   311篇
灾害及防治   34篇
  2023年   56篇
  2022年   186篇
  2021年   170篇
  2020年   105篇
  2019年   82篇
  2018年   190篇
  2017年   152篇
  2016年   260篇
  2015年   170篇
  2014年   314篇
  2013年   513篇
  2012年   351篇
  2011年   364篇
  2010年   277篇
  2009年   228篇
  2008年   308篇
  2007年   293篇
  2006年   289篇
  2005年   187篇
  2004年   143篇
  2003年   129篇
  2002年   103篇
  2001年   61篇
  2000年   50篇
  1999年   42篇
  1998年   15篇
  1997年   16篇
  1996年   9篇
  1995年   26篇
  1994年   19篇
  1993年   14篇
  1992年   9篇
  1990年   14篇
  1989年   9篇
  1987年   7篇
  1970年   11篇
  1967年   10篇
  1966年   12篇
  1965年   18篇
  1964年   28篇
  1963年   12篇
  1962年   17篇
  1961年   12篇
  1960年   13篇
  1959年   28篇
  1958年   31篇
  1957年   18篇
  1956年   15篇
  1955年   19篇
  1954年   7篇
排序方式: 共有5494条查询结果,搜索用时 15 毫秒
121.
Environmental Science and Pollution Research - This work describes the production/characterization of low molar mass chitosan nanoparticles derived from waste shrimp shells (SSC), as well as from a...  相似文献   
122.
Environmental Science and Pollution Research - It is well known that road transport emits various trace elements into the environment, which are deposited in soils in the vicinity of roads,...  相似文献   
123.
Environmental Science and Pollution Research - A linear algebra theorem like Cramer’s rule was used for the analysis of a system of equations obtained from UV spectroscopy, and results were...  相似文献   
124.
Environmental Science and Pollution Research - This study reports how adding a membrane filter (0.45-μm cellulose nitrate filter) between a glass fibre filter and the solid phase extraction...  相似文献   
125.

The presence of potentially hazardous elements (PHEs) in playground soils is generally associated with anthropogenic sources such as vehicle traffic, industries, construction sites, and biomass burning. Studies indicate that PHEs are harmful to human health and may even be carcinogenic. Therefore, the aim of this study was to evaluate the physicochemical, morphological, and mineralogical properties of soil samples from three public playgrounds located in the cities of Bogota, Medellin, and Barranquilla. Besides, the possible impacts caused by the aerodynamics of particles in Colombian cities were verified. The morphology, composition, and structure of the nanoparticles (NPs) (< 100 nm) present in these soils were evaluated by field emission scanning electron microscopy (FE-SEM) equipped with high-precision field emission (FE) and high-resolution transmission electron microscopy (HR-TEM). Soil samples were predominantly feldspar, quartz, and, to a lesser extent, clay minerals, carbonates, and hematites. The average content of PHEs was anthropogenically enriched in relation to the upper continental crust. As and Sn showed a large spatial variation, indicating the influence of local sources, such as vehicle traffic and industries. There is an inverse relationship between the total concentrations of some elements and their leachable fractions. The accumulation of traffic-derived PHEs has a negative impact on human health and the environment, which is alarming, especially for elements such as Pb, Sb, or As. Therefore, the presence of PHEs should receive greater attention from public health professionals, and limits should be set and exposures controlled. This study includes the construction of a baseline that provides basic information on pollution, its sources, and exposure routes for humans in the vicinity of Colombia’s major cities, characterized by their increasing urbanization and industrialization.

  相似文献   
126.
Environmental Science and Pollution Research - A theoretical physicochemical and thermodynamic investigation of the adsorption of heavy metals Zn2+, Cd2+, Ni2+, and Cu2+on carbon-based adsorbents...  相似文献   
127.
Environmental Science and Pollution Research - A complete survey is presented on the inorganic composition of the euhalophyte annual succulent species Salicornia patula (Chenopodiaceae), including...  相似文献   
128.
Environmental Science and Pollution Research - Phytoremediation techniques have been proposed as ecological methods to clean up contaminated sites. This study is aimed to evaluate the effect of the...  相似文献   
129.
Environmental Science and Pollution Research - Longchun 30, a new wheat variety, was used to investigate seedling growth, element absorption, and antioxidant response under 150 mM NaCl and tea...  相似文献   
130.
根据2015年度大鹏湾近岸海域5个海洋环境浮标的在线监测数据,分析大鹏湾海域海水中叶绿素a(Chl a)的时空分布特征及其与主要水质参数的相关关系。结果表明大鹏湾Chl a含量在春、夏、秋季较高,而冬季较低,实测最大值为82.23 μg/L;受水动力环境及陆源排放影响,终年沙头角附近海域的Chl a含量明显高于其他区域。Pearson相关分析结果表明,大鹏湾海域Chl a含量与水温呈现正相关关系,但与盐度不存在显著意义的相关关系。总体来看,Chl a含量的时空分布受陆地径流、外源输入和养殖环境状况等的共同影响。  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