全文获取类型
收费全文 | 105675篇 |
免费 | 1722篇 |
国内免费 | 5451篇 |
专业分类
安全科学 | 4341篇 |
废物处理 | 4164篇 |
环保管理 | 15313篇 |
综合类 | 27957篇 |
基础理论 | 28762篇 |
环境理论 | 77篇 |
污染及防治 | 20767篇 |
评价与监测 | 6036篇 |
社会与环境 | 4287篇 |
灾害及防治 | 1144篇 |
出版年
2022年 | 1276篇 |
2021年 | 1255篇 |
2020年 | 994篇 |
2019年 | 1204篇 |
2018年 | 1610篇 |
2017年 | 1760篇 |
2016年 | 2691篇 |
2015年 | 2495篇 |
2014年 | 3515篇 |
2013年 | 10462篇 |
2012年 | 3329篇 |
2011年 | 3910篇 |
2010年 | 4116篇 |
2009年 | 4257篇 |
2008年 | 3217篇 |
2007年 | 2915篇 |
2006年 | 3170篇 |
2005年 | 2915篇 |
2004年 | 3111篇 |
2003年 | 2998篇 |
2002年 | 2543篇 |
2001年 | 2880篇 |
2000年 | 2415篇 |
1999年 | 1918篇 |
1998年 | 1677篇 |
1997年 | 1657篇 |
1996年 | 1766篇 |
1995年 | 1859篇 |
1994年 | 1676篇 |
1993年 | 1491篇 |
1992年 | 1455篇 |
1991年 | 1406篇 |
1990年 | 1323篇 |
1989年 | 1289篇 |
1988年 | 1126篇 |
1987年 | 1019篇 |
1986年 | 1025篇 |
1985年 | 1092篇 |
1984年 | 1179篇 |
1983年 | 1193篇 |
1982年 | 1192篇 |
1981年 | 1106篇 |
1980年 | 951篇 |
1979年 | 937篇 |
1978年 | 833篇 |
1977年 | 729篇 |
1976年 | 658篇 |
1974年 | 630篇 |
1973年 | 656篇 |
1972年 | 671篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Abhiram S. P. Pamula Hamed Gholizadeh Mark J. Krzmarzick William E. Mausbach David J. Lampert 《Journal of the American Water Resources Association》2023,59(5):929-949
Harmful algal blooms (HABs) diminish the utility of reservoirs for drinking water supply, irrigation, recreation, and ecosystem service provision. HABs decrease water quality and are a significant health concern in surface water bodies. Near real-time monitoring of HABs in reservoirs and small water bodies is essential to understand the dynamics of turbidity and HAB formation. This study uses satellite imagery to remotely sense chlorophyll-a concentrations (chl-a), phycocyanin concentrations, and turbidity in two reservoirs, the Grand Lake O′ the Cherokees and Hudson Reservoir, OK, USA, to develop a tool for near real-time monitoring of HABs. Landsat-8 and Sentinel-2 imagery from 2013 to 2017 and from 2015 to 2020 were used to train and test three different models that include multiple regression, support vector regression (SVR), and random forest regression (RFR). Performance was assessed by comparing the three models to estimate chl-a, phycocyanin, and turbidity. The results showed that RFR achieved the best performance, with R2 values of 0.75, 0.82, and 0.79 for chl-a, turbidity, and phycocyanin, while multiple regression had R2 values of 0.29, 0.51, and 0.46 and SVR had R2 values of 0.58, 0.62, and 0.61 on the testing datasets, respectively. This paper examines the potential of the developed open-source satellite remote sensing tool for monitoring reservoirs in Oklahoma to assess spatial and temporal variations in surface water quality. 相似文献
62.
Carly E. Federman Durelle T. Scott Erich T. Hester 《Journal of the American Water Resources Association》2023,59(1):29-48
River flooding impacts human life and infrastructure, yet provides habitat and ecosystem services. Traditional flood control (e.g., levees, dams) reduces habitat and ecosystem services, and exacerbates flooding elsewhere. Floodplain restoration (i.e., bankfull floodplain reconnection and Stage 0) can also provide flood management, but has not been sufficiently evaluated for small frequent storms. We used 1D unsteady Hydrologic Engineering Center's River Analysis System to simulate small storms in a 5 km-long, second-order generic stream from the Chesapeake Bay watershed, and varied % channel restored (starting at the upstream end), restoration location, restoration bank height (distinguishes bankfull from Stage 0 restoration), and floodplain width/Manning's n. Stream restoration decreased (attenuated) peak flow up to 37% and increased floodplain exchange by up to 46%. Floodplain width and % channel restored had the largest impact on flood attenuation. The incremental effects of new restoration projects on flood attenuation were greatest when little prior restoration had occurred. By contrast, incremental effects on floodplain exchange were greatest in the presence of substantial prior restoration, setting up a tradeoff. A similar tradeoff was revealed between attenuation and exchange for project location, but not bank height or floodplain width. In particular, attenuation and exchange were always greater for Stage 0 than for bankfull floodplain restoration. Stage 0 thus may counteract human impacts such as urbanization. 相似文献
63.
Environmental Economics and Policy Studies - Streets are an essential element of cities, and their design has a profound impact on their functionality to the movement of people and their... 相似文献
64.
Zhao Yuhuan Cao Ye Shi Xunpeng Zhang Zhonghua Zhang Wenjie 《Environmental science and pollution research international》2021,28(11):13469-13486
Environmental Science and Pollution Research - Electricity generation is the largest sector with decarbonization potential for China and the world. Based on the new emission factors, this paper... 相似文献
65.
Wang Hui Zhang Pu 《Environmental science and pollution research international》2021,28(34):46089-46099
Environmental Science and Pollution Research - In iron and steel industry, sintering process releases large amount and different kinds of pollutants. Most sintering plants had applied the dust... 相似文献
66.
Nassar Hussein N. Abu Amr Salem S. El-Gendy Nour Sh. 《Environmental science and pollution research international》2021,28(7):8102-8116
Environmental Science and Pollution Research - One of the main precursors of air pollution and acid rains is the presence of the recalcitrant thiophenic compounds, for example dibenzothiophene... 相似文献
67.
Buzmakov S. A. Andreev D. N. Nazarov A. V. Dzyuba E. A. Shestakov I. E. Kuyukina M. S. El’kin A. A. Egorova D. O. Khotyanovskaya Yu. V. 《Russian Journal of Ecology》2021,52(4):267-274
Russian Journal of Ecology - Responses to contamination of several soil types with crude oil were comparatively analyzed in organisms of different trophic groups. Samples of soddy podzolic, light... 相似文献
68.
Yang Huan Yu Haiying Tang Hao Huang Huagang Zhang Xizhou Zheng Zicheng Wang Yongdong Li Tingxuan 《Environmental science and pollution research international》2021,28(31):41736-41745
Environmental Science and Pollution Research - The disparity of tolerance in plants in response to Cd stress is associated with multiple physiological processes. A pot experiment was conducted to... 相似文献
69.
Peidong Su Xiangyu Gao Junke Zhang Ridha Djellabi Bo Yang Qi Wu Zhen Wen 《Frontiers of Environmental Science & Engineering》2021,15(6):130
70.
Russian Journal of Ecology - In the southern tip of the Urals, late spring frosts, which regularly damage the leaves of the common oak (Quercus robur L.), are reflected in the formation of a... 相似文献