全文获取类型
收费全文 | 1505篇 |
免费 | 25篇 |
国内免费 | 28篇 |
专业分类
安全科学 | 64篇 |
废物处理 | 45篇 |
环保管理 | 323篇 |
综合类 | 164篇 |
基础理论 | 339篇 |
环境理论 | 2篇 |
污染及防治 | 470篇 |
评价与监测 | 92篇 |
社会与环境 | 50篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 9篇 |
2022年 | 20篇 |
2021年 | 23篇 |
2020年 | 8篇 |
2019年 | 25篇 |
2018年 | 24篇 |
2017年 | 36篇 |
2016年 | 39篇 |
2015年 | 41篇 |
2014年 | 45篇 |
2013年 | 211篇 |
2012年 | 61篇 |
2011年 | 66篇 |
2010年 | 68篇 |
2009年 | 75篇 |
2008年 | 71篇 |
2007年 | 88篇 |
2006年 | 84篇 |
2005年 | 49篇 |
2004年 | 48篇 |
2003年 | 50篇 |
2002年 | 40篇 |
2001年 | 21篇 |
2000年 | 28篇 |
1999年 | 17篇 |
1998年 | 12篇 |
1997年 | 23篇 |
1996年 | 10篇 |
1995年 | 19篇 |
1994年 | 19篇 |
1993年 | 22篇 |
1992年 | 13篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 10篇 |
1988年 | 7篇 |
1987年 | 10篇 |
1986年 | 7篇 |
1984年 | 8篇 |
1983年 | 14篇 |
1982年 | 15篇 |
1981年 | 14篇 |
1980年 | 7篇 |
1978年 | 6篇 |
1977年 | 8篇 |
1976年 | 5篇 |
1974年 | 5篇 |
1972年 | 8篇 |
1971年 | 6篇 |
1970年 | 5篇 |
排序方式: 共有1558条查询结果,搜索用时 755 毫秒
951.
952.
953.
954.
Two studies compared specific versus broad measures in linking personality with work behavior. In Study 1, 100 university students completed the 20 subscales of the Personality Research Form and an in‐basket exercise scored on 16 distinct managerial behaviors. In Study 2, 335 market research field representatives completed the Hogan Personality Inventory, containing 41 specific trait scales organized into seven primary scales, and were rated by their supervisors on seven performance dimensions. In both studies, significant linkages between broad personality and criterion variables (e.g., factors) were explained by stronger relations among relatively few specific variables. Moreover, consistent with prior research, weak relations among broad measures obscured important linkages at the specific level, including several cases of cancellation (i.e., specific traits loading the same factor in the same direction correlated with criteria in opposite directions). Canonical correlations with appropriate shrinkage correction revealed notable improvements in criterion validity over inter‐factor correlations and helped summarize the data while retaining the diagnostic advantages of specificity. Our findings are unique by demonstrating the value of specificity on both sides of the prediction equation. Implications for personnel selection are discussed. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
955.
956.
Russell J. Qualls Joshua M. Scott William B. DeOreo 《Journal of the American Water Resources Association》2001,37(3):547-559
ABSTRACT: Granular matrix soil moisture sensors were used to control urban landscape irrigation in Boulder, Colorado, during 1997. The purpose of the study was to evaluate the effectiveness and reliability of the technology for water conservation. The 23 test sites included a traffic median, a small city park, and 21 residential sites. The results were very good. The system limited actual applications to an average of 73 percent of the theoretical requirement. This resulted in an average saving of $331 per installed sensor. The sensors were highly reliable. All 23 sensors were placed in service at least three years prior to the 1997 study during earlier studies. Of these, only two had failed by the beginning of the 1997 study, both due to external factors. Including replacement of these failed sensors, the total repair cost for the 1997 irrigation season was less than $270. The effort required to maintain each system was small, only about 6–7 minutes per visit. Each site was visited weekly for this study, but less frequent visits could be made in practice. The sensors observed in this study performed well, significantly reduced water consumption, and were easy to monitor and maintain. Soil moisture sensors appear to be a useful and economical tool for urban water conservation. 相似文献
957.
958.
George O. Rogers 《Journal of Environmental Planning and Management》1997,40(1):59-80
This paper examines the relationship between perceived risk and hazard events in two communities in terms of the perception and acceptability of risk. One community experienced an acute risk event comprised of a fire at a chemical plant that resulted in a large-scale evacuation (an acute hazard). The other community was involved in a seven-year controversy over the siting of a hazardous waste incinerator (a chronic risk). While the results are broadly consistent with a learning model of perceived risk, the support is more limited than envisioned; hence, the static forces of risk perception are stronger than anticipated. 相似文献
959.
960.