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   282篇
  免费   3篇
  国内免费   3篇
安全科学   3篇
废物处理   5篇
环保管理   23篇
综合类   169篇
基础理论   46篇
污染及防治   28篇
评价与监测   6篇
社会与环境   7篇
灾害及防治   1篇
  2021年   3篇
  2017年   4篇
  2016年   4篇
  2015年   4篇
  2014年   9篇
  2013年   11篇
  2012年   9篇
  2011年   8篇
  2010年   10篇
  2009年   7篇
  2008年   7篇
  2007年   7篇
  2006年   4篇
  2005年   5篇
  2003年   6篇
  2002年   5篇
  2001年   4篇
  2000年   4篇
  1997年   4篇
  1995年   4篇
  1976年   3篇
  1969年   3篇
  1966年   5篇
  1965年   2篇
  1964年   2篇
  1963年   4篇
  1962年   7篇
  1961年   4篇
  1960年   7篇
  1959年   4篇
  1958年   3篇
  1957年   7篇
  1956年   7篇
  1955年   6篇
  1954年   3篇
  1953年   2篇
  1952年   3篇
  1950年   2篇
  1943年   5篇
  1942年   2篇
  1941年   2篇
  1939年   2篇
  1933年   4篇
  1932年   4篇
  1930年   4篇
  1929年   5篇
  1926年   3篇
  1924年   3篇
  1914年   2篇
  1913年   4篇
排序方式: 共有288条查询结果,搜索用时 15 毫秒
1.
2.
Environmental Science and Pollution Research - The aim of this study was to investigate the uptake of four beta-blockers by the model plant Lepidium sativum (garden cress) and their possible...  相似文献   
3.
The topography and motion of contaminant plumes in groundwater may be determined by surveying the three-dimensional distribution of contaminant freights [1] as well as through a period-integral monitoring by contaminant dosimeters [1]. Conventional methods of taking water samples for chemical analysis cannot fulfill any of these requirements. Sorption active passive collectors suitable for corresponding surveys in gaseous phases are unsuitable for examination in aquifers. Passive collectors for the examination of undisturbed aquifers represent the central part of a probing device system developed by the authors for monitoring chemical and hydraulic parameters within all kinds of aquifers. These passive collectors permit both a determination of the relative contaminant freights at deliberate vertical spacing of vertically ordered measuring points, and period-integrating detection of vertical profiles of relative contaminant freights. The easy-to-handle passive collectors are suitable for the collection of organic and inorganic contaminants and may be evaluated by standardized chemical analysis methods. In this way, passive collectors fulfill the essential prerequisites for purpose-oriented monitoring of contaminant plumes. Moreover, passive collectors for ground water monitoring are well suited for the in situ-examination of any other aquifer, both still and fluent, regardless of its depth or extent. Examples of application may be sewage ducts, sewage plants, rivers, lakes, oceans, water samples and especially the identification of contaminants and trace substances.  相似文献   
4.
5.
Magnetic resonance imaging (MRI) appears to be increasingly used, in addition to standard ultrasonography for the diagnosis of abnormalities in utero. Previous studies have recently drawn attention to the technical refinement of MRI to visualize the fetal bones and muscles. Beyond commonly used T2-weighted MRI, echoplanar, thick-slab T2-weighted and dynamic sequences, and three-dimensional MRI techniques, are about to provide new imaging insights into the normal and the pathological musculoskeletal system of the fetus. This review emphasizes the potential significance of MRI in the visualization of the fetal musculoskeletal system. © 2012 John Wiley & Sons, Ltd.  相似文献   
6.
To explore the dynamics involved in team coordination, we examine the impact of team familiarity and team leader experience on team coordination errors (TCEs). We argue that team familiarity has a U‐shaped effect on TCEs. We study the moderating effects of team leader prior experience and team leader team‐specific experience on the association between team familiarity and TCEs. We use panel data on teams from the National Basketball Association to test the hypotheses. Our findings support the U‐shaped relationship between team familiarity and TCEs and the moderating effect of team leader team‐specific experience on this relationship. The paper advances research on errors in organizations by analyzing the antecedents of TCEs, so far an underexplored empirical phenomenon. Moreover, it contributes to research on coordination in teams by empirically examining the interplay between formal and informal coordination mechanisms. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
7.
This report summarizes the results of two studies of electricity supply for Europe (EU), the Middle East (ME) and North Africa (NA) up to the year 2050. It shows that a transition to competitive, secure and sustainable supply of electricity and water is possible using renewable energy sources, efficiency gains and fossil fuel backup for balancing power. A strong cooperation between the EU and MENA for the market introduction of renewable energy and the interconnection of the electricity grids by high-voltage direct-current transmission are keys to the success and survival of the whole region. However, the necessary measures will take at least two decades to become effective. Therefore, adequate policy and economic frameworks for their realization must be introduced immediately. The importance of sustainable energy for the security of freshwater supplies in MENA is also described.
Hans Müller-SteinhagenEmail:
  相似文献   
8.
9.
10.
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