全文获取类型
收费全文 | 595篇 |
免费 | 3篇 |
国内免费 | 7篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 17篇 |
环保管理 | 68篇 |
综合类 | 309篇 |
基础理论 | 53篇 |
污染及防治 | 114篇 |
评价与监测 | 17篇 |
社会与环境 | 11篇 |
出版年
2018年 | 6篇 |
2017年 | 10篇 |
2015年 | 15篇 |
2014年 | 11篇 |
2013年 | 21篇 |
2012年 | 10篇 |
2011年 | 19篇 |
2010年 | 18篇 |
2009年 | 20篇 |
2008年 | 20篇 |
2007年 | 25篇 |
2006年 | 22篇 |
2005年 | 21篇 |
2004年 | 13篇 |
2003年 | 14篇 |
2002年 | 12篇 |
2001年 | 6篇 |
2000年 | 6篇 |
1999年 | 15篇 |
1995年 | 8篇 |
1990年 | 5篇 |
1984年 | 5篇 |
1967年 | 7篇 |
1966年 | 7篇 |
1965年 | 6篇 |
1963年 | 9篇 |
1962年 | 4篇 |
1961年 | 7篇 |
1959年 | 6篇 |
1958年 | 9篇 |
1957年 | 5篇 |
1956年 | 10篇 |
1955年 | 12篇 |
1954年 | 10篇 |
1947年 | 4篇 |
1942年 | 4篇 |
1939年 | 10篇 |
1938年 | 8篇 |
1937年 | 5篇 |
1936年 | 4篇 |
1934年 | 4篇 |
1933年 | 9篇 |
1932年 | 6篇 |
1929年 | 5篇 |
1928年 | 4篇 |
1927年 | 4篇 |
1926年 | 5篇 |
1925年 | 4篇 |
1914年 | 5篇 |
1913年 | 4篇 |
排序方式: 共有605条查询结果,搜索用时 15 毫秒
131.
The decomposition of leaf litter is controlled by several factors. One factor that may play an important role is the content
of condensed tannins (proanthocyanidins). Here we designed a combined method to isolate proanthocyanidins from leaf extracts,
to convert them to anthocyanidins, and to quantify individual anthocyanidins exactly with a new, simple, but sensitive high-performance
liquid chromatography method. We used this method to show composition of proanthocyanidins and to monitor degradation of proanthocyanidins
and individual constituents in leaf litter in an aquatic environment over time. Despite the rapid decrease in the initial
concentrations, a fraction of the proanthocyanidins remained detectable for several weeks. 相似文献
132.
D'Affonseca FM Blum P Finkel M Melzer R Grathwohl P 《Journal of contaminant hydrology》2008,102(1-2):120-139
A coal tar contaminated site was characterized using traditional and innovative investigation methods. A careful interpretation of hydrogeological and hydrogeochemical data allowed for the conceptualization of the heterogeneous coal tar distribution in the subsurface. Past and future contaminant release from the source zone was calculated using a modeling framework consisting of a three-dimensional steady-state groundwater flow model (MODFLOW) and two hydrogeochemical models (MIN3P). Computational time of long-term simulations was reduced by simplifying the coal tar composition using 3 composite and 2 individual constituents and sequential application of a 2D centerline model (for calibration and predictions) and a 3D model (only for predictions). Predictions were carried out for a period of 1000 years. The results reveal that contaminant mass flux is governed by the geometry of zones containing residual coal tar, amount of coal tar, its composition and the physicochemical properties of the constituents. The long-term predictions made using the 2D model show that even after 1000 years, source depletion will be small with respect to phenanthrene, 89% of initial mass will be still available, and for the moderately and sparingly soluble composite constituents, 60% and 98%, respectively. 相似文献
133.
The role of private rural properties for conserving native vegetation in Brazilian Southern Amazonia
Siqueira Auberto Ricaurte Luisa Fernanda Borges Guilherme Augusto Nunes Gustavo Manzon Wantzen Karl Matthias 《Regional Environmental Change》2018,18(1):21-32
Regional Environmental Change - The State of Mato Grosso in Brazil has undergone intensive land use changes over the past decades. Native ecosystems have been converted into agrosystems for the... 相似文献
134.
135.
136.
137.
Modern civilisation explores and penetrates the interior of the Earth's crust, recovers from it and stores into it solids, fluids and gases to a hitherto unprecedented degree. Management of underground structures such as boreholes or reservoirs take into account the existing stress either to take advantage of it or at least to minimise the effects of man-made stress. This paper presents the World Map of Tectonic Stresses (in short: World Stress Map or WSM) as a fundamental geophysical data-base. The impact of the WSM is pointed out: in the context of global tectonics, in seismic hazard quantification and in a wide range of technological problems in industrial applications such as oil reservoir management and stability of underground openings (tunnels, boreholes and waste disposal sites). 相似文献
138.
139.
140.
Karl Krejci-Graf 《Die Naturwissenschaften》1963,50(16):539-541