全文获取类型
收费全文 | 278篇 |
免费 | 0篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 6篇 |
环保管理 | 8篇 |
综合类 | 125篇 |
基础理论 | 42篇 |
污染及防治 | 70篇 |
评价与监测 | 11篇 |
社会与环境 | 12篇 |
灾害及防治 | 2篇 |
出版年
2021年 | 3篇 |
2018年 | 8篇 |
2017年 | 4篇 |
2015年 | 7篇 |
2014年 | 13篇 |
2013年 | 7篇 |
2012年 | 6篇 |
2011年 | 5篇 |
2010年 | 12篇 |
2009年 | 10篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 8篇 |
2002年 | 6篇 |
1998年 | 7篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1993年 | 4篇 |
1979年 | 2篇 |
1971年 | 2篇 |
1969年 | 2篇 |
1966年 | 3篇 |
1965年 | 5篇 |
1964年 | 2篇 |
1963年 | 7篇 |
1962年 | 4篇 |
1961年 | 3篇 |
1960年 | 2篇 |
1959年 | 5篇 |
1958年 | 5篇 |
1957年 | 3篇 |
1956年 | 10篇 |
1955年 | 7篇 |
1954年 | 3篇 |
1953年 | 3篇 |
1952年 | 2篇 |
1950年 | 2篇 |
1949年 | 2篇 |
1947年 | 2篇 |
1942年 | 2篇 |
1940年 | 2篇 |
1939年 | 4篇 |
1934年 | 3篇 |
1933年 | 2篇 |
1929年 | 2篇 |
1925年 | 2篇 |
1918年 | 2篇 |
排序方式: 共有278条查询结果,搜索用时 0 毫秒
191.
Roethlin Remo Luis Gilli Adrian Wehrli Bernhard Gilli Robin Sue Wiederhold Jan Georg Dubois Nathalie 《Environmental science and pollution research international》2022,29(57):85789-85801
Environmental Science and Pollution Research - Historical industrial activities at the Horn Richterwil, on the shore of Lake Zurich (Switzerland), caused widespread metal contamination on land and... 相似文献
192.
Doug Beare Franz Hölker Georg H. Engelhard Eddie McKenzie David G. Reid 《Die Naturwissenschaften》2010,97(9):797-808
Marine protected areas (MPAs) are attaining increasing importance in the management of marine ecosystems. They are effective for conservation in tropical and subtropical areas (mainly coral and rocky reefs), but it is debated whether they are useful in the management of migratory fish stocks in open temperate regions. World War II created a large marine area within which commercial fishing was prevented for 6 years. Here we analyse scientific trawl data for three important North Sea gadoids, collected between 1928 and 1958. Using statistical models to summarise the data, we demonstrate the potential of MPAs for expediting the recovery of over-exploited fisheries in open temperate regions. Our age-structured data and population models suggest that wild fish stocks will respond rapidly and positively to reductions in harvesting rates and that the numbers of older fish in a population will react before, and in much greater proportion, than their younger counterparts in a kind of Mexican wave. Our analyses demonstrate both the overall increase in survival due to the lack of harvesting in the War and the form of the age-dependent wave in numbers. We conclude that large closed areas can be very useful in the conservation of migratory species from temperate areas and that older fish benefit fastest and in greater proportion. Importantly, any rise in spawning stock biomass may also not immediately result in better recruitment, which can respond more slowly and hence take longer to contribute to higher future harvestable biomass levels. 相似文献
193.
194.
Georg Wohlfahrt Lukas Hrtnagl Albin Hammerle Martin Graus Armin Hansel 《Atmospheric environment (Oxford, England : 1994)》2009,43(30):4570-4576
Ozone (O3) fluxes above a temperate mountain grassland were measured by means of the eddy covariance (EC) method using a slow-response O3 analyser. The resultant flux loss was corrected for by a series of transfer functions which model the various sources of high- and, in particular, low-pass filtering. The resulting correction factors varied on average between 1.7 and 3.5 during night and daytime, respectively. A cospectral analysis confirmed the accuracy of this approach. O3 fluxes were characterised by a comparatively large random uncertainty, which during daytime typically amounted to 60%. EC O3 fluxes were compared against O3 flux measurements made concurrently with the flux-gradient (FG) method. The two methods generally agreed well, except for a period between sunrise and early afternoon, when the FG method was suspected of being affected by the presence of photochemical sources/sinks. O3 flux magnitudes and deposition velocities determined with the EC method compared nicely with the available literature from grassland studies. We conclude that our understanding of the causes and consequences of various sources of flux loss (associated with any EC system) has sufficiently matured so that also less-than-ideal instrumentation may be used in EC flux applications, albeit at the cost of relatively large empirical corrections. 相似文献
195.
The pHstat-procedure is a method to examine the pH-dependent mobilisation of heavy metals and other pollutants from solids. The metals in such extracts are usually determined by atomic absorption (AAS) or by emission spectrometry (ICP-OES). The obtained values present the total amount of mobilized metals. A statement concerning the effect-oriented true toxicity of the extract, respective of the examined solid, is not possible. A combined effect-oriented procedure, such as a the bioaluminescence-inhibition test with luminescence bacteria enables a precise statement about the ecotoxicity of solids. A variation of the inhibition test (addition of EDTA) indicates the main binding forms of heavy metals and the part of inhibition caused by organic material. 相似文献
196.
Schaldach Rüdiger Meurer Katharina H. E. Jungkunst Hermann F. Nendel Claas Lakes Tobia Gollnow Florian Göpel Jan Boy Jens Guggenberger Georg Strey Robert Strey Simone Berger Thomas Gerold Gerhard Schönenberg Regine Böhner Jürgen Schindewolf Marcus Latynskiy Evgeny Hampf Anna Parker Phillip S. Sentelhas Paulo César 《Regional Environmental Change》2018,18(1):161-173
Regional Environmental Change - This article describes the design of a new model-based assessment framework to identify and analyse possible future trajectories of agricultural development and... 相似文献
197.
Lavorel Sandra Grigulis Karl Leitinger Georg Kohler Marina Schirpke Uta Tappeiner Ulrike 《Regional Environmental Change》2017,17(8):2251-2264
Regional Environmental Change - Land use and spatial patterns which reflect social-ecological legacies control ecosystem service (ES) supply. Yet, temporal changes in ES bundles associated with... 相似文献
198.
199.
200.
Methanogenic bacteria area diverse group of anaerobic procaryotes that ferment CO2 plus H2 to CH4. Besides their unusual energy metabolism they are unique in that their cell walls do not contain murein, and in that their cell membranes are composed of isoprenoid lipids. Coenzymes occur which are not found in any other living organism. The translation apparatus differs, e.g., in not being affected by antibiotics known to be inhibitors of procaryotic protein synthesis. Most of the methanogens can grow on CO2 as sole carbon source; autotrophic CO2 fixation does not, however, proceed via reactions of the Calvin cycle. Molecular genealogical analysis has revealed that methanogenic bacteria constitute a grouping phylogenetically distinct from most other procaryotes. 相似文献