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   278篇
  免费   0篇
安全科学   2篇
废物处理   6篇
环保管理   8篇
综合类   125篇
基础理论   42篇
污染及防治   70篇
评价与监测   11篇
社会与环境   12篇
灾害及防治   2篇
  2021年   3篇
  2018年   8篇
  2017年   4篇
  2015年   7篇
  2014年   13篇
  2013年   7篇
  2012年   6篇
  2011年   5篇
  2010年   12篇
  2009年   10篇
  2008年   9篇
  2007年   9篇
  2006年   8篇
  2005年   7篇
  2004年   7篇
  2003年   8篇
  2002年   6篇
  1998年   7篇
  1996年   7篇
  1995年   3篇
  1993年   4篇
  1979年   2篇
  1971年   2篇
  1969年   2篇
  1966年   3篇
  1965年   5篇
  1964年   2篇
  1963年   7篇
  1962年   4篇
  1961年   3篇
  1960年   2篇
  1959年   5篇
  1958年   5篇
  1957年   3篇
  1956年   10篇
  1955年   7篇
  1954年   3篇
  1953年   3篇
  1952年   2篇
  1950年   2篇
  1949年   2篇
  1947年   2篇
  1942年   2篇
  1940年   2篇
  1939年   4篇
  1934年   3篇
  1933年   2篇
  1929年   2篇
  1925年   2篇
  1918年   2篇
排序方式: 共有278条查询结果,搜索用时 15 毫秒
231.
232.
The pharmaceutical diclofenac (DCF) is released in considerably high amounts to the aquatic environment. Photo-transformation of DCF was reported as the main degradation pathway in surface waters and was found to produce metabolites with enhanced toxicity to the green algae Scenedesmus vacuolatus. We identified and subsequently confirmed 2-[2-(chlorophenyl)amino]benzaldehyde (CPAB) as a transformation product with enhanced toxicity using effect-directed analysis. The EC50 of CPAB (4.8 mg/L) was a factor of 10 lower than that for DCF (48.1 mg/L), due to the higher hydrophobicity of CPAB (log Kow = 3.62) compared with DCF (log Dow = 2.04) at pH 7.0.  相似文献   
233.
Fifteen years ago, the first mapping guidelines for the recording and evaluation of river physical habitat quality in Germany, closely following the Länder Arbeitsgemeinschaft Wasser (LAWA) field survey, have been published. In light of this experience, a revised version has now been developed for North Rhine-Westphalia (West Germany). For the assessment, the streams are divided into segments serving as survey units. The survey is performed primarily in the field from the mouth to the source by an on-site recording of data. Defined reference conditions of the relevant morphological stream types serve as basis of the evaluation. Two evaluation procedures are carried out independently to validate the quality of the data. The proven basic concept operates as follows: the local scale habitat variables are grouped into 31 single parameters, which are then aggregated into six main parameters. These can further be aggregated into three zones: streambed, banks and adjacent land. The main modifications of the presented version are the following: (1) a larger differentiation of morphological stream types and (2) a higher level of detail concerning the mapping of relevant habitat characteristics. The last point allows additional evaluation options related to the morphological needs of the instream biota and a differentiated survey of anthropogenic degradation. Despite all modifications, the comparability with previous surveys has been largely maintained. By qualitative comparison of this method with other European mapping guidelines, different concepts of hydromorphological mapping are finally discussed.  相似文献   
234.
European legislation has set a limit of 5 mg Hg per compact fluorescent lamp (CFL). Compliance with this regulation is tested with a method given in a European law from 2002 (“EU method”). According to the EU method, the arc tube has to be placed inside a fume cupboard and cut into segments. These pieces are collected and washed with HNO3, which is finally analyzed for Hg. In this study, we investigated the losses of Hg via the gas phase, which are ignored by the EU method, using a semiquantitative radiochemical neutron activation analysis (RNAA) technique developed at the TRIGA Mark II reactor in Vienna (Austria). Depending on the product, the losses range as high as approximately 2 % at 20 °C. At higher ambient temperatures (hot summer days), the losses may increase by a factor of 4. Quality products generally suffer lower emission via the gas phase than cheap products, which is probably due to amalgam or other techniques that retain the Hg from broken CFLs. In any case, the EU method introduces a small but avoidable systematic error into the analysis and, in contrast to recommended practices, underestimates the Hg content of the CFL in question. Having technical alternatives at hand, we urge European lawmakers to adjust the law accordingly.  相似文献   
235.
236.
237.
238.
239.
240.
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