全文获取类型
收费全文 | 4463篇 |
免费 | 33篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 72篇 |
废物处理 | 170篇 |
环保管理 | 219篇 |
综合类 | 1558篇 |
基础理论 | 935篇 |
环境理论 | 8篇 |
污染及防治 | 1141篇 |
评价与监测 | 214篇 |
社会与环境 | 180篇 |
灾害及防治 | 7篇 |
出版年
2022年 | 33篇 |
2019年 | 42篇 |
2018年 | 94篇 |
2017年 | 93篇 |
2016年 | 107篇 |
2015年 | 94篇 |
2014年 | 111篇 |
2013年 | 214篇 |
2012年 | 112篇 |
2011年 | 197篇 |
2010年 | 143篇 |
2009年 | 131篇 |
2008年 | 216篇 |
2007年 | 186篇 |
2006年 | 160篇 |
2005年 | 136篇 |
2004年 | 113篇 |
2003年 | 111篇 |
2002年 | 143篇 |
2001年 | 92篇 |
2000年 | 83篇 |
1999年 | 53篇 |
1998年 | 43篇 |
1997年 | 47篇 |
1996年 | 57篇 |
1995年 | 57篇 |
1994年 | 53篇 |
1992年 | 43篇 |
1991年 | 38篇 |
1990年 | 39篇 |
1989年 | 34篇 |
1982年 | 30篇 |
1981年 | 33篇 |
1976年 | 32篇 |
1973年 | 30篇 |
1968年 | 29篇 |
1967年 | 35篇 |
1966年 | 30篇 |
1965年 | 48篇 |
1964年 | 37篇 |
1963年 | 36篇 |
1962年 | 31篇 |
1961年 | 44篇 |
1960年 | 41篇 |
1959年 | 43篇 |
1958年 | 47篇 |
1957年 | 41篇 |
1956年 | 40篇 |
1955年 | 39篇 |
1954年 | 41篇 |
排序方式: 共有4504条查询结果,搜索用时 15 毫秒
951.
El Rasafi Taoufik Pereira Ruth Pinto Glória Gonçalves Fernando J. M. Haddioui Abdelmajid Ksibi Mohamed Römbke Jörg Sousa José Paulo Marques Catarina R. 《Environmental science and pollution research international》2021,28(13):15782-15793
Environmental Science and Pollution Research - The contamination left by abandoned mines demands sustainable mitigation measures. Hence, the aim of this study was to examine the phytoremediator... 相似文献
952.
Joke Muys Yves Jacquemyn Bettina Blaumeiser Laura Bourlard Nathalie Brison Saskia Bulk Patrizia Chiarappa Anne De Leener Marjan De Rademaeker Julie Désir Anne Destrée Koenraad Devriendt Annelies Dheedene Armelle Duquenne Annelies Fieuw Erik Fransen Jean-Stéphane Gatot Mauricette Jamar Sandra Janssens Jorien Kerstjens Kathelijn Keymolen Damien Lederer Björn Menten Bruno Pichon Sonia Rombout Yves Sznajer Ann Van Den Bogaert Kris Van Den Bogaert Joris Vermeesch Katrien Janssens 《黑龙江环境通报》2020,40(10):1272-1283
953.
954.
955.
956.
Top covers of waste landfills conventionally contain a drain layer over a 1(low-permeable clay liner usually containing smectite minerals. The rate of percolation of the clay liner, which may require tens of years to become water-saturated, determines the downward transport of ions released from the underlying waste to and through the bottom clay liner. The percolation rate is controlled by the composition and density of the tipper liner, which should be as tight as possible. This implies a high density and therefore a high swelling potential which must be moderated by proper design. The bottom clay liner is a less effective and reliable barrier since cation exchange will increase the hydraulic conductivity and cause a significant rise in percolation rate and risk of chemical attack by the percolate. The top liner will undergo very moderate strain if the ash fill is effectively compacted and undergoes little self-compaction. Processes that may cause degradation are freezing and drying and require proper design. In this paper the authors examine the performance of ash-fills isolated by clay liners and conclude that the most important issue is to design and construct the top liner to be as impermeable as possible paying less attention to the tightness of the bottom layer. 相似文献
957.
958.
L. A. König 《Die Naturwissenschaften》1986,73(11):651-654
959.
960.
Christian Huber Manuela Baumgarten Axel Göttlein Verena Rotter 《Water, Air, & Soil Pollution: Focus》2004,4(2-3):391-414
More than 85% of the mountainous spruce forest of the Bavarian Forest National Park died after bark beetle attack during the last decade. The elemental budget of intact stands and of different stages after the dieback was investigated. N-fluxes in throughfall of intact stands were lower (12–16 kg ha-1 a-1) than in an earlier study in an intact mountainous spruce stand in the Bavarian Forest National Park and were reduced in the first years after the dieback (3–5 kg N ha-1 a-1). Nitrate-N fluxes by seepage water of intact stands at 40 cm depth, which is below the main rooting zone, were moderate (5–9 kg ha-1 a-1). After the dieback of the stands, NH4 + concentrations were increased in humus efflux as were NO3 - concentrations in mineral soil. Due to the relatively high precipitation, dilution of the elemental concentrations in seepage was considerable.Therefore, NO3 - concentrations were usually below the level of drinking water (806 μmol NO3 - L-1), with lowest concentrations after the snowmelt and highest in autumn. Nitrate concentrations were elevated from the first year until the 7th year after the dieback. Total NO3 --N losses by seepage until the 7th year after the dieback equalled 543 kg N ha-1. Aluminium fluxesafter the dieback were enhanced in the mineral soil from 55 to 503 mmolc m-2 a-1 (average of 8 yr), K+ fluxes from 8 to 37 mmolc m-2 a-1, and Mg2+ fluxes from 13 to 35 mmolc m-2 a-1. The consequences for the nutritional status of the ecosystem, the hydrosphere, and forest management are discussed in the paper. 相似文献