首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   278篇
  免费   1篇
  国内免费   6篇
安全科学   5篇
废物处理   16篇
环保管理   23篇
综合类   37篇
基础理论   59篇
污染及防治   95篇
评价与监测   34篇
社会与环境   14篇
灾害及防治   2篇
  2023年   8篇
  2022年   21篇
  2021年   14篇
  2020年   17篇
  2019年   5篇
  2018年   13篇
  2017年   24篇
  2016年   19篇
  2015年   10篇
  2014年   26篇
  2013年   25篇
  2012年   8篇
  2011年   14篇
  2010年   8篇
  2009年   11篇
  2008年   14篇
  2007年   10篇
  2006年   10篇
  2005年   6篇
  2004年   1篇
  2003年   3篇
  2002年   7篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1998年   2篇
  1996年   1篇
  1995年   2篇
  1994年   1篇
  1988年   1篇
  1981年   1篇
排序方式: 共有285条查询结果,搜索用时 0 毫秒
281.
Environmental Science and Pollution Research - In recent years, the demand for clean water has been growing all over the world despite the different threats posed, including increasing pollution,...  相似文献   
282.
Journal of Polymers and the Environment - There is a scientific consensus that the use of membranes for water filtration presents itself as a promising research area for removing a wide range of...  相似文献   
283.
Environmental Science and Pollution Research - Anthropogenic pollution and global climate change have resulted in favorable environmental conditions for increased frequency and duration of...  相似文献   
284.

The dynamics of total phosphorus (TP) in 18 strategic reservoirs of the high-density reservoir network of the Brazilian semiarid was evaluated during the wet and dry periods for the past 12 years. Seasonal overlying concentrations presented no significant differences for about 90% of the reservoirs (p>0.05). This was attributed to a trade-off between the hydrological/limnological processes occurring in the two seasons. Then, a transient complete-mix mass balance model was applied with particular adaptations for the tropical semiarid reservoirs to estimate the TP load for each season. Because of the relatively well-mixed conditions and high hypolimnetic dissolved oxygen concentrations during the wet season, the wet load was assumed to represent the external TP load. On the other hand, because of the absence of reservoir inflow during the dry season, phosphorus release under anoxic sediment conditions and wind-induced resuspension under shallow water depths, the dry load was assumed to reflect the internal TP load. The maximum external loads were related to peak inflows, notably after drought periods. Consistently, the largest internal loads were obtained during the drought periods, when the reservoirs were shallower and more prone to phosphorus release and resuspension. By comparing the impact of the two input load types, the wet period load was predominant in 72% of the reservoirs. The areal phosphorus loads ranged from 0.66 to 7.29 gP m2 year?1, which were consistent with the literature, despite the very high density of reservoirs. Finally, power-law curves including data for all studied reservoirs were adjusted between the dry period load and volume, dry and wet period loads, wet period load and inflow, and total load and catchment area, resulting in satisfactory R2 (0.84–0.98).

  相似文献   
285.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号