全文获取类型
收费全文 | 2448篇 |
免费 | 57篇 |
国内免费 | 25篇 |
专业分类
安全科学 | 99篇 |
废物处理 | 80篇 |
环保管理 | 461篇 |
综合类 | 313篇 |
基础理论 | 628篇 |
环境理论 | 7篇 |
污染及防治 | 661篇 |
评价与监测 | 168篇 |
社会与环境 | 87篇 |
灾害及防治 | 26篇 |
出版年
2023年 | 23篇 |
2022年 | 52篇 |
2021年 | 57篇 |
2020年 | 33篇 |
2019年 | 50篇 |
2018年 | 73篇 |
2017年 | 75篇 |
2016年 | 125篇 |
2015年 | 77篇 |
2014年 | 109篇 |
2013年 | 201篇 |
2012年 | 128篇 |
2011年 | 173篇 |
2010年 | 102篇 |
2009年 | 116篇 |
2008年 | 148篇 |
2007年 | 135篇 |
2006年 | 137篇 |
2005年 | 77篇 |
2004年 | 79篇 |
2003年 | 82篇 |
2002年 | 62篇 |
2001年 | 38篇 |
2000年 | 51篇 |
1999年 | 21篇 |
1998年 | 20篇 |
1997年 | 14篇 |
1996年 | 26篇 |
1995年 | 22篇 |
1994年 | 24篇 |
1993年 | 12篇 |
1992年 | 13篇 |
1991年 | 12篇 |
1990年 | 11篇 |
1989年 | 13篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 13篇 |
1982年 | 16篇 |
1981年 | 16篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1975年 | 5篇 |
1969年 | 4篇 |
1968年 | 3篇 |
排序方式: 共有2530条查询结果,搜索用时 250 毫秒
851.
852.
853.
Lisa J. Henne Daniel W. Schneider Luis M. Martinez 《Journal of Environmental Planning and Management》2002,45(5):613-632
The cost-effectiveness of rapid assessment approaches make their adaptation for use in developing countries appealing, but biological assessment methods need to be validated before use in new geographic areas. The authors tested the suitability of a family-level biotic index for use in a river in west-central Mexico that receives organic point-source pollution from untreated municipal sewage and sugar-cane processing. The biotic index was highly correlated to dissolved oxygen, and could detect different levels of pollution. Information from rapid assessment biomonitoring was used successfully by local natural resource managers to help bring about improvements in water resource management. 相似文献
854.
855.
Thermal hydrolysis of secondary scum at 9 bars and 170 degrees C was shown to completely destroy Gordonia sp. cells and reduce its foaming potential, so that it can be recycled to headworks or sent to the solids-handling side of the plant without the risk of causing foaming problems in the activated sludge system and anaerobic digesters. This process shows promise for biological foam control in wastewater treatment plants where solids retention time control and selective wasting cannot be applied and/or selector installation is not possible. An initial cost comparison of thermal hydrolysis and several widely accepted foam-management strategies shows it to be competitive; however, optimization of operating pressure and temperature is necessary. 相似文献
856.
Albert C. F. Lam Daniel H. C. Chan Tony M. F. Tong Mary H. Y. Tang Steven Y. F. Lo Ivan F. M. Lo Stephen T. S. Lam 《黑龙江环境通报》2006,26(11):1018-1020
We present the first confirmed case by molecular analysis of a metaphyseal chondrodysplasia, McKusick type, in a 22-week fetus. Two novel compound heterozygous mutations, 64T> A and 79G > T, were found in the highly conserved regions of the RMRP gene. Twenty-two heterozygous g.1018 T> C mutations, two homozygous g.1018 T> C mutations, two heterozygous insertion mutations g.799_g.800insC and one heterozygous insertion mutation g.849_g.850insT were found among 100 normal controls. Careful radiological examination of the fetus for skeletal dysplasia allowed definitive diagnosis, proper genetic counselling and future prenatal diagnosis. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
857.
858.
859.
860.
Daniel C. L. Satgé Marie-Annick Laumond François Desfarges Marie-Pierre R. Chenard 《黑龙江环境通报》2001,21(4):284-288
A therapeutic abortion was conducted on a 17-week-old male fetus with a large umbilical cord teratoma associated with an exomphalos. A review of the literature revealed ten other cases of umbilical cord teratoma and shows that these tumors have a very polymorphic presentation. Four fetuses and infants died from various causes indicating that there is a need for close follow-up of pregnancies with umbilical cord teratoma. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献