全文获取类型
收费全文 | 30865篇 |
免费 | 369篇 |
国内免费 | 680篇 |
专业分类
安全科学 | 936篇 |
废物处理 | 1147篇 |
环保管理 | 4131篇 |
综合类 | 5327篇 |
基础理论 | 8799篇 |
环境理论 | 21篇 |
污染及防治 | 8237篇 |
评价与监测 | 1789篇 |
社会与环境 | 1278篇 |
灾害及防治 | 249篇 |
出版年
2022年 | 252篇 |
2021年 | 237篇 |
2020年 | 188篇 |
2019年 | 249篇 |
2018年 | 442篇 |
2017年 | 428篇 |
2016年 | 631篇 |
2015年 | 573篇 |
2014年 | 790篇 |
2013年 | 2264篇 |
2012年 | 946篇 |
2011年 | 1354篇 |
2010年 | 1124篇 |
2009年 | 1132篇 |
2008年 | 1345篇 |
2007年 | 1387篇 |
2006年 | 1252篇 |
2005年 | 1047篇 |
2004年 | 1054篇 |
2003年 | 995篇 |
2002年 | 977篇 |
2001年 | 1274篇 |
2000年 | 900篇 |
1999年 | 577篇 |
1998年 | 484篇 |
1997年 | 476篇 |
1996年 | 466篇 |
1995年 | 507篇 |
1994年 | 463篇 |
1993年 | 421篇 |
1992年 | 432篇 |
1991年 | 383篇 |
1990年 | 381篇 |
1989年 | 416篇 |
1988年 | 349篇 |
1987年 | 302篇 |
1986年 | 276篇 |
1985年 | 305篇 |
1984年 | 288篇 |
1983年 | 321篇 |
1982年 | 322篇 |
1981年 | 271篇 |
1980年 | 243篇 |
1979年 | 269篇 |
1978年 | 229篇 |
1977年 | 195篇 |
1976年 | 200篇 |
1975年 | 192篇 |
1974年 | 172篇 |
1972年 | 198篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
106.
107.
108.
Because of its significant toxicological effects on the environment and human health,arsenic(As) is a major global issue.In this study,an Fe-based metal-organic framework(MOF)(Materials of Institut Lavoisier:MIL-100(Fe)) which was impregnated with reduced graphene oxide(rGO) by using a simple hydrothermal method and coated with birnessitetype manganese oxide(δ-MnO_2) using the one-pot reaction process(MIL-100(Fe)/rGO/δ-MnO_2 nanocomposites) was synthesized and applied successfully in As removal.The removal efficiency was rapid,the equilibrium was achieved in 40 min and 120 min for As(Ⅲ) and As(Ⅴ),respectively,at a level of 5 mg/L.The maximum adsorption capacities of As(Ⅲ) and As(Ⅴ) at pH 2 were 192.67 mg/g and 162.07 mg/g,respectively.The adsorbent revealed high stability in pH range 2-9 and saturated adsorbent can be fully regenerated at least five runs.The adsorption process can be described by the pseudo-second-order kinetic model and Langmuir monolayer adsorption.The adsorption mechanisms consisted of electrostatic interaction,oxidation and inner sphere surface complexation. 相似文献
109.
Samari Mohammad Ridha Firas Manovic Vasilije Macchi Arturo Anthony E. J. 《Mitigation and Adaptation Strategies for Global Change》2020,25(1):25-41
Mitigation and Adaptation Strategies for Global Change - Direct air capture (DAC) is a developing technology for removing carbon dioxide (CO2) from the atmosphere or from low-CO2-containing... 相似文献
110.
Reclamation of domestic wastewater for agricultural irrigation is viewed as a sustainable option to create an alternative water source and address water scarcity. Free-living amoebae(FLA), which are amphizoic protozoa, are widely distributed in various environmental sources. The FLA could cause considerable environmental and health risks. However, little information is available on the risk of these protozoa. In this study, we evaluated the feasibility using rural domestic wastewater for agricultural irrigation, and analyzed dynamic changes of the microbial community structure and FLA populations in raw and treated wastewater, as well as the phyllosphere and rhizosphere of lettuce production sites that were irrigated with different water sources. The bacterial community dynamics were analyzed by terminal restriction fragment length polymorphism(T-RFLP). The bacterial community structures in the influent were similar to that in the effluent, while in some cases relative abundances varied significantly. The populations of Acanthamoeba spp. and Hartmannella vermiformis in the anaerobically treated wastewater were significantly higher than in the raw wastewater. The vegetables could harbor diverse amoebae, and the abundances of Acanthamoeba spp. and H. vermiformis in the rhizosphere were significantly higher than in the phyllosphere. Accordingly, our studies show insight into the distribution and dissemination of amoebae in wastewater treatment and irrigation practices. 相似文献