全文获取类型
收费全文 | 323篇 |
免费 | 18篇 |
国内免费 | 142篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 25篇 |
环保管理 | 17篇 |
综合类 | 204篇 |
基础理论 | 94篇 |
污染及防治 | 90篇 |
评价与监测 | 12篇 |
社会与环境 | 13篇 |
灾害及防治 | 14篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 13篇 |
2021年 | 20篇 |
2020年 | 15篇 |
2019年 | 20篇 |
2018年 | 20篇 |
2017年 | 15篇 |
2016年 | 18篇 |
2015年 | 24篇 |
2014年 | 21篇 |
2013年 | 26篇 |
2012年 | 18篇 |
2011年 | 15篇 |
2010年 | 28篇 |
2009年 | 18篇 |
2008年 | 19篇 |
2007年 | 12篇 |
2006年 | 16篇 |
2005年 | 4篇 |
2004年 | 14篇 |
2003年 | 14篇 |
2002年 | 4篇 |
2001年 | 13篇 |
2000年 | 9篇 |
1999年 | 9篇 |
1998年 | 18篇 |
1997年 | 17篇 |
1996年 | 17篇 |
1995年 | 8篇 |
1994年 | 11篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1985年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有483条查询结果,搜索用时 218 毫秒
351.
352.
353.
354.
Xiangguang Ji Cheng Liu Zhouqing Xie Qihou Hu Yunsheng Dong Guangqiang Fan Tianshu Zhang Chengzhi Xing Zhuang Wang Zeeshan Jave Jianguo Liu 《环境科学学报(英文版)》2019,31(5):81-90
Beijing–Tianjin–Hebei area is suffering from atmospheric pollution from a long time. The understanding of the air pollution mechanism is of great importance for officials to design strategies for the environmental governance. Mixing layer height(MLH) is a key factor influencing the diffusion of air pollutants. It plays an important role on the evolution of heavy pollution events. Light detection and ranging(lidar), is an effective remote-sensing tool, which can retrieve high spatial and temporal evolution process within mixing layer(ML), especially the variation of MLH. There are many methods to retrieve MLH, but each method has its own applicable limitations. The Mie-lidar data in Beijing was firstly used to compare three different algorithms which are widely used under different pollution levels.We find that the multi-layer structure near surface may cause errors in the detection of mixing layer. The MLH retrieved based on image edge detection was better than another two methods especially under heavy polluted episode. Then we applied this method to investigate the evolution of the mixing layer height during a pollution episode in December2016. MLH at Gucheng county showed the positive correlation with the concentration of particulate matters during the start of this pollution episode. The elevated pollution level in Gucheng was not associated with MLH's decrease, and the significantly increased particulate matters raised the boundary layer, which trapped the pollutants near the surface. 相似文献
355.
Peng Xu Hongjun Han Haifeng Zhuang Baolin Hou Shengyong Ji Dexin Wang Kun Li Qian Zhao 《环境科学学报(英文版)》2015,27(5):221-225
The potential for degradation of five nitrogenous heterocyclic compounds(NHCs), i.e.,imidazole, pyridine, indole, quinoline, and carbazole, was investigated under anoxic conditions with acclimated activated sludge. Results showed that NHCs with initial concentration of 50 mg/L could be completely degraded within 60 hr. The degradation of five NHCs was dependent upon the chemical structures with the following sequence:imidazole pyridine indole quinoline carbazole in terms of their degradation rates.Quantitative structure–biodegradability relationship studies of the five NHCs showed that the anoxic degradation rates were correlated well with highest occupied molecular orbital.Additionally, the active sites of NHCs identified by calculation were confirmed by analysis of intermediates using gas chromatography and mass spectrometry. 相似文献
356.
随着城市经济的快速发展,多数城市河流均受到不同程度的污染。2012年1月—2013年7月采用外循环技术对受污染的常州市景观河流进行水质改善研究,结果表明:河道ρ(TN)由14.6~16.0 mg/L降到5.08~5.78 mg/L,ρ(NH3-N)由11.1~13.5 mg/L降到0.92~1.06 mg/L,ρ(COD)由74.5~95.2 mg/L降到20.2~21.0 mg/L,ρ(TP)由1.22~1.23 mg/L降到0.218~0.220 mg/L。该景观河水质指标除总氮外,其余均达到GB 3838—2002《地表水环境质量标准》IV类标准。 相似文献
357.
染料对环境的影响及生物处理技术进展 总被引:4,自引:0,他引:4
从染料在环境中的归趋开始,综述了染料的生物处理技术,认为生物吸附,生物絮凝处理,以及筛同效“广谱”脱色菌,厌氧-好氧处理,固定化技术是发展的热点。 相似文献
358.
359.
360.
废水处理新技术中的超临界水氧化法 总被引:20,自引:1,他引:19
超临界水氧化法是一种有效处理有机废水的方法,本文在总结超临界水的特点和优点的基础上,着重介绍了超临界水氧化的基本原理,工艺流程及应用状况,探讨该项技术的前景与发展趋势。、 相似文献