全文获取类型
收费全文 | 5071篇 |
免费 | 240篇 |
国内免费 | 1754篇 |
专业分类
安全科学 | 357篇 |
废物处理 | 314篇 |
环保管理 | 381篇 |
综合类 | 2662篇 |
基础理论 | 825篇 |
污染及防治 | 1931篇 |
评价与监测 | 189篇 |
社会与环境 | 191篇 |
灾害及防治 | 215篇 |
出版年
2024年 | 1篇 |
2023年 | 86篇 |
2022年 | 256篇 |
2021年 | 192篇 |
2020年 | 145篇 |
2019年 | 140篇 |
2018年 | 203篇 |
2017年 | 240篇 |
2016年 | 244篇 |
2015年 | 282篇 |
2014年 | 396篇 |
2013年 | 527篇 |
2012年 | 405篇 |
2011年 | 465篇 |
2010年 | 340篇 |
2009年 | 307篇 |
2008年 | 326篇 |
2007年 | 272篇 |
2006年 | 282篇 |
2005年 | 204篇 |
2004年 | 157篇 |
2003年 | 166篇 |
2002年 | 175篇 |
2001年 | 155篇 |
2000年 | 163篇 |
1999年 | 154篇 |
1998年 | 157篇 |
1997年 | 119篇 |
1996年 | 113篇 |
1995年 | 86篇 |
1994年 | 68篇 |
1993年 | 61篇 |
1992年 | 54篇 |
1991年 | 26篇 |
1990年 | 36篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有7065条查询结果,搜索用时 15 毫秒
991.
Qu Yang Luo Hongjie Gao Guolei Wang Yaowu Wu Linli Gao Yang Xing Yulong 《Journal of Material Cycles and Waste Management》2023,25(2):1130-1141
Journal of Material Cycles and Waste Management - Secondary aluminum dross (SAD) is classified as hazardous waste by many countries in the world because it contains a large number of toxic and... 相似文献
992.
993.
QIN Min XIE Pin-hu LIU Wen-qing LI Ang DOU Ke FANG Wu LIU Jian-guo ZHANG Wei-jun 《环境科学学报(英文版)》2006,18(1):69-75
Measurements of nitrous acid (HONO) and nitrogen dioxide (NO2) in Beijing City have been performed by means of a developed differential optical absorption spectroscopy (DOAS) system based on photodiode array (PDA), during the autumn of 2004. HONO and NO2 were simultaneously identified by their characteristic absorption bands in the spectral region between 337 nm and 372 nm with high sensibility and time resolution. The concentrations of HONO exhibit obviously diurnal variation with a nocturnal maximum and a daytime minimum. The highest HONO value up to 11.8 μg/m^3 was observed during the night of 2/3 September. Possible sources of the observed HONO were discussed. Good correlation to NO2 indicates that NO2 is a main source component. The measurement also shows direct emission of HONO is an imnortant source in strongly polluted urban area. 相似文献
994.
Wu Wenjing Zhou Jinsheng Niu Jianying Lv Haodong 《Environment, Development and Sustainability》2021,23(9):13261-13283
Environment, Development and Sustainability - Due to rapid socioeconomic development, seeking the coordination of resources exploitation and the ecological environment has become an objective... 相似文献
995.
低温液氮与泡沫混合液直接接触产生氮气泡沫是一种新型的掺混形式,利用液氮高汽化比的特点,搭建液氮泡沫可视化实验装置,进行氮气-水两相流及液氮泡沫流动特性的研究。结果表明,液氮相变产生大量氮气,其与泡沫液混合产生泡沫,温度有所回升,最终趋于泡沫混合液温度;管路沿程压降较小;液氮射流破碎及流动过程可分为6个区域:低温液氮区、向上循环翻滚区、滞留区、泡沫与泡沫混合液混合区、致密泡沫区、泡沫混合液区。流体向下游流动过程中持续发泡;为防止管路结冰,需合理控制泡沫混合液与液氮流量。 相似文献
996.
Afshin Shabani Xiaodong Zhang Xuefeng Chu Timothy P. Dodd Haochi Zheng 《Journal of the American Water Resources Association》2020,56(2):297-309
Devils Lake is a terminal lake located in northeast North Dakota. Because of its glacial origin and accumulated salts from evaporation, the lake has a high concentration of sulfate compared to the surrounding water bodies. From 1993 to 2011, Devils Lake water levels rose by ~10 m, which flooded surrounding communities and increased the chance of an overspill to the Sheyenne River. To control the flooding, the State of North Dakota constructed two outlets to pump the lake water to the river. However, the pumped water has raised concerns about of water quality degradation and potential flooding risk of the Sheyenne River. To investigate these perceived impacts, a Soil and Water Assessment Tool (SWAT) model was developed for the Sheyenne River and it was linked to a coupled SWAT and CE‐QUAL‐W2 model that was developed for Devils Lake in a previous study. While the current outlet schedule has attempted to maintain the total river discharge within the confines of a two‐year flood (36 m3/s), our simulation from 2012 to 2018 revealed that the diversion increased the Sheyenne River sulfate concentration from an average of 125 to >750 mg/L. Furthermore, a conceptual optimization model was developed with a goal of better preserving the water quality of the Sheyenne River while effectively mitigating the flooding of Devils Lake. The optimal solution provides a “win–win” outlet management that maintains the efficiency of the outlets while reducing the Sheyenne River sulfate concentration to ≤600 mg/L. 相似文献
997.
998.
环保是我国在发展中较为重视的一个工作内容,为了能够顺利地做好城市环保工作,在2016年提出了"环保管家"这个环保概念,通过这个理念推动环保服务业的发展。但是由于该理念提出的时间尚短,所以在实施阶段出现了较多的阻力,导致环保管家并没能实现方案提出的预想效果。鉴于环保管家对工业园区工作的重要性,本文将分析环保管家在工业园区开展的意义以及途径,希望能对相关从业人员的工作有所启发。 相似文献
1000.
Luman Zhou Chengyang Wu Yuwei Xie Siqing Xia 《Frontiers of Environmental Science & Engineering》2020,14(2):27