全文获取类型
收费全文 | 4988篇 |
免费 | 34篇 |
国内免费 | 28篇 |
专业分类
安全科学 | 62篇 |
废物处理 | 202篇 |
环保管理 | 197篇 |
综合类 | 2031篇 |
基础理论 | 912篇 |
环境理论 | 6篇 |
污染及防治 | 1150篇 |
评价与监测 | 299篇 |
社会与环境 | 174篇 |
灾害及防治 | 17篇 |
出版年
2022年 | 59篇 |
2021年 | 47篇 |
2020年 | 42篇 |
2019年 | 45篇 |
2018年 | 80篇 |
2017年 | 76篇 |
2016年 | 103篇 |
2015年 | 87篇 |
2014年 | 132篇 |
2013年 | 240篇 |
2012年 | 150篇 |
2011年 | 138篇 |
2010年 | 141篇 |
2009年 | 157篇 |
2008年 | 176篇 |
2007年 | 195篇 |
2006年 | 149篇 |
2005年 | 138篇 |
2004年 | 121篇 |
2003年 | 138篇 |
2002年 | 104篇 |
2001年 | 98篇 |
2000年 | 99篇 |
1999年 | 88篇 |
1998年 | 66篇 |
1997年 | 59篇 |
1996年 | 40篇 |
1995年 | 56篇 |
1994年 | 58篇 |
1991年 | 38篇 |
1990年 | 47篇 |
1985年 | 38篇 |
1979年 | 43篇 |
1977年 | 38篇 |
1976年 | 39篇 |
1969年 | 35篇 |
1967年 | 57篇 |
1966年 | 50篇 |
1965年 | 53篇 |
1964年 | 60篇 |
1963年 | 63篇 |
1962年 | 58篇 |
1961年 | 64篇 |
1960年 | 56篇 |
1959年 | 65篇 |
1958年 | 59篇 |
1957年 | 67篇 |
1956年 | 49篇 |
1955年 | 51篇 |
1954年 | 46篇 |
排序方式: 共有5050条查询结果,搜索用时 906 毫秒
21.
The behaviour of the three organophosphate esters tributyl phosphate (TBP), tris(2-chloroethyl)phosphate (TCEP) and tris(2-butoxyethyl)phosphate (TBEP) during infiltration of river water to ground water has been investigated. The monitoring site is the Oder River and the adjacent Oderbruch aquifer. From March 2000 to July 2001, 76 ground water samples from monitoring wells located close to the Oder River and nine river water samples were collected. Additionally, influent and effluent samples from local waste water treatment plants, one sample of rain water and samples of roof runoff were collected. All samples were analysed by solid-phase-extraction followed by gas chromatography/mass spectrometry. TBP, TCEP and TBEP were detected at mean values of 622 ng l(-1), 352 ng l(-1), and 2955 ng l(-1), respectively in municipal waste water effluents. This points to a major input of these compounds into the Oder River by municipal waste water discharge. The concentrations of TBP and TBEP decreased downstream the Oder River possibly due to aerobic degradation. TBP, TCEP and TBEP were detected in ground water influenced predominantly by bank-filtered water. This demonstrates a transport of organic compounds by river water infiltration to ground water. TBP, TCEP and TBEP were also detected in rain water precipitation, roof runoff and ground water predominantly influenced by rain water infiltration. This hints to an input of these compounds to ground water by dry and wet deposition after atmospheric transport. Organophosphate esters were also detected in parts of the aquifer at 21 m depth. This demonstrates low anaerobic degradation rates of TBP, TCEP and TBEP. 相似文献
22.
Graef F Schmidt G Schröder W Stachow U 《Environmental monitoring and assessment》2005,108(1-3):189-203
A representative environmental monitoring network at the regional scale cannot use raster-based or random sampling designs, but requires a stratified sampling procedure integrating different information layers, and it has to occur in ecologically differing homogeneous regions (ecoregions). These we have determined using a set of spatial strata with ecological variables which we analysed with classification and regression trees (CART). We present a framework for environmental monitoring, that covers different scales, and we transfer the framework to a potential GMO (genetically modified organisms) monitoring network. We use ecoregion and other environmental strata together with existing environmental monitoring networks to determine GMO monitoring sites more precisely. 相似文献
23.
A. Haurie J.J.E. Kübler A. Clappier H. van den Bergh 《Environmental Modeling and Assessment》2004,9(1):1-12
A method is proposed to build integrated models (also called Metamodels) aimed at quantifying the economic efficiency of air quality policies. This Metamodeling approach is based on the coupling of two complementary models, that operate at different scales in space and time, and which represent the economic and the physical and chemical processes, respectively. The joint consideration of the physico-chemical and techno-economic structure of the pollution control problems permits a comprehensive evaluation of air pollution abatement strategies. The motivating pollution control problems include urban-regional air quality management through efficient energy and traffic control policies. A pilot study, exploiting data collected in the Geneva canton (Switzerland), is used to demonstrate the potential of the approach. 相似文献
24.
Becker E. W. Bier W. Ehrfeld W. Schubert K. Schütte R. Seidel D. 《Die Naturwissenschaften》1976,63(9):407-411
The Science of Nature - The development of reliable manufacturing methods for commercial separation elements, the successful operation of separative stages, and extensive tests performed on plant... 相似文献
25.
E. Lamla F. Boschke G. Traving G. Pfotzer H. Wolter W. Walcher H. D. Dahmen H. J. Queisser W. W. Klingbeil K. Beyermann O. Müller R. R. Ernst D. Reinen H. Muth W. Becker G. Wunsch G. I. Distler L. Jaenicke H. G. v. Schnering H. Werner F. Reiff H. Schimassek W. Höll H. K. Vasil W. F. Angermeier W. Ruppel J. C. Eccles G. Spiteller H. Oettel W. Vogell P. Brosche K. J. Hsü H. -U. Schmincke 《Die Naturwissenschaften》1975,62(3):143-143
26.
27.
28.
29.
30.