全文获取类型
收费全文 | 90730篇 |
免费 | 1275篇 |
国内免费 | 1352篇 |
专业分类
安全科学 | 3818篇 |
废物处理 | 3287篇 |
环保管理 | 14011篇 |
综合类 | 21531篇 |
基础理论 | 26328篇 |
环境理论 | 74篇 |
污染及防治 | 14686篇 |
评价与监测 | 5385篇 |
社会与环境 | 3668篇 |
灾害及防治 | 569篇 |
出版年
2022年 | 840篇 |
2021年 | 837篇 |
2020年 | 716篇 |
2019年 | 873篇 |
2018年 | 1139篇 |
2017年 | 1178篇 |
2016年 | 2193篇 |
2015年 | 1862篇 |
2014年 | 2607篇 |
2013年 | 9310篇 |
2012年 | 2271篇 |
2011年 | 2584篇 |
2010年 | 3326篇 |
2009年 | 3466篇 |
2008年 | 2061篇 |
2007年 | 1931篇 |
2006年 | 2291篇 |
2005年 | 2244篇 |
2004年 | 2564篇 |
2003年 | 2391篇 |
2002年 | 1930篇 |
2001年 | 2183篇 |
2000年 | 1971篇 |
1999年 | 1497篇 |
1998年 | 1368篇 |
1997年 | 1362篇 |
1996年 | 1476篇 |
1995年 | 1576篇 |
1994年 | 1463篇 |
1993年 | 1322篇 |
1992年 | 1303篇 |
1991年 | 1279篇 |
1990年 | 1235篇 |
1989年 | 1189篇 |
1988年 | 1039篇 |
1987年 | 973篇 |
1986年 | 985篇 |
1985年 | 1067篇 |
1984年 | 1164篇 |
1983年 | 1162篇 |
1982年 | 1174篇 |
1981年 | 1096篇 |
1980年 | 942篇 |
1979年 | 925篇 |
1978年 | 819篇 |
1977年 | 718篇 |
1976年 | 637篇 |
1975年 | 603篇 |
1973年 | 632篇 |
1972年 | 637篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
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
65.
66.
67.
68.
David W. Mehlman 《Conservation biology》1994,8(4):1141-1145
69.
70.
Material suppliers and industrial metabolism 总被引:1,自引:1,他引:0
Arnold Tukker Avtar S. Jasser René Kleijn 《Environmental science and pollution research international》1997,4(2):113-120
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