全文获取类型
收费全文 | 894篇 |
免费 | 12篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 38篇 |
废物处理 | 32篇 |
环保管理 | 205篇 |
综合类 | 121篇 |
基础理论 | 223篇 |
污染及防治 | 200篇 |
评价与监测 | 67篇 |
社会与环境 | 24篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 8篇 |
2020年 | 17篇 |
2019年 | 13篇 |
2018年 | 14篇 |
2017年 | 12篇 |
2016年 | 18篇 |
2015年 | 18篇 |
2014年 | 29篇 |
2013年 | 84篇 |
2012年 | 34篇 |
2011年 | 56篇 |
2010年 | 29篇 |
2009年 | 42篇 |
2008年 | 43篇 |
2007年 | 67篇 |
2006年 | 35篇 |
2005年 | 31篇 |
2004年 | 28篇 |
2003年 | 30篇 |
2002年 | 32篇 |
2001年 | 26篇 |
2000年 | 15篇 |
1999年 | 13篇 |
1998年 | 11篇 |
1997年 | 13篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 14篇 |
1993年 | 13篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 12篇 |
1988年 | 6篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 12篇 |
1980年 | 5篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1975年 | 8篇 |
1974年 | 5篇 |
1972年 | 3篇 |
排序方式: 共有917条查询结果,搜索用时 84 毫秒
61.
62.
63.
64.
65.
66.
67.
68.
John Troiano Bruce R. Johnson Sally Powell Steve Schoenig 《Environmental monitoring and assessment》1994,32(3):269-288
An empirical approach to profiling areas of ground water contamination by pesticides was devised that did not rely upon determining the level of vulnerability between land areas and that did not assume any particular pathway for ground water contamination. Climatic and soil data were obtained for 1-square mile sections of land in California where pesticide residues had been found in well water samples and the detection was attributed to legal agricultural applications. These sections were designated as known contaminated (KC) sections. Climate and soil data were also obtained for sections which lacked either well sampling data or a positive pesticide detection. These sections were designated as candidate sections. Statistical procedures were used to cluster groups of KC sections first with respect to climate characteristics and then with respect to soil characteristics. Principal components analysis (PCA) was used to construct a statistical profile of soil variables for each cluster of KC sections. A method based on the PCA was developed to compare the similarity of soil profiles derived for each KC section cluster to individual candidate sections. Since the profiling scheme was based only on data from KC sections, candidate sections that did not match any KC cluster profile could only be considered dissimilar to contaminated sections, receiving a status of not-classified. This profiling method is flexible and it can be revised to incorporate updated well sampling information. 相似文献
69.
70.