全文获取类型
收费全文 | 1894篇 |
免费 | 176篇 |
国内免费 | 603篇 |
专业分类
安全科学 | 166篇 |
废物处理 | 79篇 |
环保管理 | 141篇 |
综合类 | 1169篇 |
基础理论 | 307篇 |
污染及防治 | 488篇 |
评价与监测 | 104篇 |
社会与环境 | 159篇 |
灾害及防治 | 60篇 |
出版年
2024年 | 13篇 |
2023年 | 61篇 |
2022年 | 149篇 |
2021年 | 135篇 |
2020年 | 143篇 |
2019年 | 101篇 |
2018年 | 117篇 |
2017年 | 134篇 |
2016年 | 123篇 |
2015年 | 151篇 |
2014年 | 132篇 |
2013年 | 175篇 |
2012年 | 158篇 |
2011年 | 164篇 |
2010年 | 132篇 |
2009年 | 120篇 |
2008年 | 107篇 |
2007年 | 76篇 |
2006年 | 53篇 |
2005年 | 42篇 |
2004年 | 35篇 |
2003年 | 60篇 |
2002年 | 66篇 |
2001年 | 60篇 |
2000年 | 40篇 |
1999年 | 27篇 |
1998年 | 11篇 |
1997年 | 13篇 |
1996年 | 16篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 10篇 |
1992年 | 4篇 |
1991年 | 10篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1971年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有2673条查询结果,搜索用时 15 毫秒
511.
乌东德水库为季调节水库,采用宽度平均的立面二维水温数学模型对水库水温结构进行预测,结果表明:乌东德水库水温结构呈季节性分层特征,电站运行对下游水温过程有一定程度的春季低温水和冬季高温水影响。如果采用单层取水方案,在2~8月的下泄水温低于坝址现状水温,最大降幅为2.0℃,下泄低温水将对坝下鱼类产卵繁殖产生不利影响。乌东德水电站拟采取分层取水的措施,对低温水较为敏感的鱼类产卵期3~6月采用叠梁门取水。相比于单层取水,叠梁门方案对低温水的改善效果较明显,下泄水温提高了0.8~1.1℃,能一定程度地减缓升温期水温延迟效应。 相似文献
512.
Ding Wei Feng Wei Zhen Meng Zhen Qingjiang Liu Ying 《Environmental science and pollution research international》2022,29(21):31121-31132
Environmental Science and Pollution Research - The local thermal property evaluation of pavement materials has not received enough attention, making the implementation of cool material measures to... 相似文献
513.
Environment, Development and Sustainability - The issue of e-waste recycling is imminent. With the continuous enhancement of Internet technology and people's awareness of sustainable... 相似文献
514.
515.
516.
517.
Isolation and characterization of a strain with high microbial attachment in aerobic granular sludge
Tingting Zhao Kai Qiao Lei Wang Wei Zhang Wei Meng Fan Liu Xu Gao Jianrong Zhu 《环境科学学报(英文版)》2021,33(8):194-203
Aerobic granule is a special microbial aggregate associated with biofilm structure. The formation of aerobic granular sludge is primarily depending on its bacterial community and relevant microbiological properties. In this experiment, a strain with high microbial attachment was isolated from aerobic granular sludge, and the detailed characteristics were examined. Its high attachment ability could reach 2.34 (OD600nm), while other low attachment values were only around 0.06-0.32, which indicated a big variation among the different bacteria. The strain exhibited a very special morphology with many fibric fingers under SEM observation. A distinctive behaviour was to form a spherical particle by themselves, which would be very beneficial for the formation and development of granular sludge. The EPS measurement showed that its PN content was higher than low attachment bacteria, and 3D-EEM confirmed that there were some different components. Based on the 16S rRNA analysis, it was identified to mostly belong to Stenotrophomonas. Its augmentation to particle sludge cultivation demonstrated that the strain could significantly promote the formation of aerobic granule. Conclusively, it was strongly suggested that it might be used as a good and potential model strain or chassis organism for the aerobic granular sludge formation and development. 相似文献
518.
Cao Yanmei Li Zhe Ji Wei Ma Meng 《Environmental science and pollution research international》2021,28(23):29467-29483
Environmental Science and Pollution Research - The aerodynamic noise around the high-speed railway bridge is studied by the train-bridge-flow field numerical model and theory analysis. With the... 相似文献
519.
Xue Honghai Li Ming Liu Binshuo Meng Qingling 《Environmental science and pollution research international》2021,28(7):8258-8265
Environmental Science and Pollution Research - The photochemical degradation of norfloxacin (NOR) and oxytetracycline (OTC) was investigated under ultraviolet (UV) irradiation. The results... 相似文献
520.
Trends in the accumulation of metals by different plant species have been analyzed in a forest phytocenosis of the southern taiga zone of the Middle Urals, which is polluted by emissions from a copper-smelting plant. The rate of metal accumulation in the course of annual and net phytomass production and metal outflow with surface waters beyond the biogeocenosis boundaries have been estimated.Translated from Ekologiya, No. 1, 2005, pp. 26–31.Original Russian Text Copyright © 2005 by Fedorova, Odintseva. 相似文献