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   89486篇
  免费   1222篇
  国内免费   1084篇
安全科学   3708篇
废物处理   3268篇
环保管理   13755篇
综合类   21038篇
基础理论   26161篇
环境理论   71篇
污染及防治   14218篇
评价与监测   5378篇
社会与环境   3667篇
灾害及防治   528篇
  2022年   797篇
  2021年   796篇
  2020年   645篇
  2019年   857篇
  2018年   1118篇
  2017年   1165篇
  2016年   2159篇
  2015年   1825篇
  2014年   2575篇
  2013年   9244篇
  2012年   2153篇
  2011年   2382篇
  2010年   3285篇
  2009年   3368篇
  2008年   1901篇
  2007年   1749篇
  2006年   2173篇
  2005年   2183篇
  2004年   2511篇
  2003年   2334篇
  2002年   1893篇
  2001年   2222篇
  2000年   1972篇
  1999年   1488篇
  1998年   1361篇
  1997年   1351篇
  1996年   1477篇
  1995年   1566篇
  1994年   1472篇
  1993年   1330篇
  1992年   1315篇
  1991年   1289篇
  1990年   1221篇
  1989年   1214篇
  1988年   1042篇
  1987年   980篇
  1986年   985篇
  1985年   1055篇
  1984年   1153篇
  1983年   1162篇
  1982年   1170篇
  1981年   1091篇
  1980年   942篇
  1979年   917篇
  1978年   820篇
  1977年   714篇
  1976年   637篇
  1975年   601篇
  1973年   629篇
  1972年   634篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
This paper examines the relationship between survivor reactions to a downsizing and retention subsequent to a downsizing. We hypothesize that survivors who experience the downsizing as distributively, procedurally, and interactionally just and who see top management as trustworthy will feel more attached to the organization because each reduces the threat inherent in downsizing. In addition, we hypothesize that survivors who feel empowered will also feel more attached to the organization because they feel better able to cope with the downsizing. We further hypothesize that those survivors who feel more attached to the organization following the downsizing will be more likely to remain with the organization in the coming year. The theoretical model is tested on a sample of aerospace employees who survived an organizational downsizing. The trustworthiness of management, distributive justice, procedural justice, and three dimensions of empowerment are found to facilitate more organizational attachment. Higher levels of attachment are found, in turn, to facilitate less voluntary turnover in the year following the downsizing. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   
112.
113.
114.
115.
116.
The effects of food availability, female size, and social interactions on the quality of Pomacentrus amboinensis larvae at hatching were examined using two field-based experiments. In Experiment 1, food availability and female size significantly influenced size, eye diameter and levels of yolk reserves of larvae at hatching. Small females (47 to 52 mm standard length, SL) whose diets were not supplemented, produced the longest larvae (3.0 ± 0.01 mm total length, TL) with the least yolk reserves (50.1 ± 1.04 μm2). Irrespective of female size, those that received additional food produced larvae with the largest yolk-sacs (large females: 87.60 ± 1.53 μm2; small females: 80.14 ± 1.24 μm2). In Experiment 2, interactions with conspecifics had a greater affect on the somatic development of larvae at hatching than food availability. Increased social interactions resulted in larvae that were ⋍3% longer, with 2% greater head depth, than larvae from females that spawned in isolation on the experimental reefs. Fed females produced larvae with ⋍20% more yolk than larvae from females whose diets were not supplemented. All three factors (food availability, female size, and intensity of social interactions) tested within these experiments vary spatially and temporally among reefs. There is the potential, therefore, for larvae at the onset of the planktonic stage to vary in quality, level of development, and probability of survival. Received: 12 August 1996 / Accepted: 26 August 1996  相似文献   
117.
118.
Material suppliers and industrial metabolism   总被引:1,自引:1,他引:0  
Life Cycle Assessment (LCA) is not sufficiently tailored to the analysis of strategic environmental problems of material suppliers. Sustainable development calls for a reduction by a factor of 10 to 20 in the material intensity of the economy, a situation which leads to dramatic shifts in markets for raw materials. Furthermore, a material supplier might have major improvement options in the material’s numerous downstream uses. LCAs, however, can’t cover these two aspects. An adapted form of Substance Flow Analysis (SFA) may be an answer. This approach defines a system in relation to the flow of a specific material through society. All environmental interventions related to the material are inventoried. An emission evaluation indicates the dominant environmental bottlenecks, given the current market volume of each application of the material. This helps to identify improvement options and strategic choices in market portfolios. Scenario analysis on potential measures can further indicate changes of material flows — and thus markets — in the system. The approach is illustrated with a case study on chlorine.  相似文献   
119.
120.
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