全文获取类型
收费全文 | 2227篇 |
免费 | 24篇 |
国内免费 | 26篇 |
专业分类
安全科学 | 67篇 |
废物处理 | 88篇 |
环保管理 | 289篇 |
综合类 | 473篇 |
基础理论 | 424篇 |
环境理论 | 1篇 |
污染及防治 | 654篇 |
评价与监测 | 131篇 |
社会与环境 | 132篇 |
灾害及防治 | 18篇 |
出版年
2023年 | 22篇 |
2022年 | 28篇 |
2021年 | 51篇 |
2020年 | 30篇 |
2019年 | 40篇 |
2018年 | 75篇 |
2017年 | 66篇 |
2016年 | 86篇 |
2015年 | 88篇 |
2014年 | 100篇 |
2013年 | 120篇 |
2012年 | 102篇 |
2011年 | 144篇 |
2010年 | 116篇 |
2009年 | 120篇 |
2008年 | 116篇 |
2007年 | 129篇 |
2006年 | 93篇 |
2005年 | 64篇 |
2004年 | 86篇 |
2003年 | 49篇 |
2002年 | 79篇 |
2001年 | 70篇 |
2000年 | 32篇 |
1999年 | 21篇 |
1998年 | 18篇 |
1997年 | 26篇 |
1996年 | 22篇 |
1995年 | 32篇 |
1994年 | 22篇 |
1993年 | 8篇 |
1992年 | 16篇 |
1991年 | 24篇 |
1990年 | 14篇 |
1989年 | 20篇 |
1988年 | 9篇 |
1987年 | 4篇 |
1985年 | 5篇 |
1984年 | 6篇 |
1982年 | 13篇 |
1981年 | 10篇 |
1979年 | 9篇 |
1970年 | 6篇 |
1969年 | 4篇 |
1966年 | 4篇 |
1965年 | 5篇 |
1962年 | 4篇 |
1960年 | 4篇 |
1956年 | 3篇 |
1954年 | 3篇 |
排序方式: 共有2277条查询结果,搜索用时 46 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
Hofschreuder P van der Meulen W Heeres P Slanina S 《Journal of environmental monitoring : JEM》1999,1(2):143-147
Passive samplers provide an excellent opportunity to perform indicative measurements or establish a dense network of measuring sites. A drawback compared with conventional active measuring methods is the larger spread of results. This variation can, to a large extent, be attributed to the influence of temperature, sampler geometry and wind on sampling results. A proper design of sampler geometry and optimum choice of draught shield can reduce the influence of wind velocity on a badge type sampler to less than 10%. Wire mesh screens prove to be inadequate in damping turbulence. Filters give good results. Attention should be paid to the size and isolation value of the walls of the sampler to prevent thermal updrafts occurring within the sampler. Tube type samplers are less influenced by wind, provided that turbulence is prevented from influencing diffusion within the sampler. 相似文献
9.
Stefanutti R Packer AP Filho BC Mattiazzo ME de Figueiredo RF 《Journal of environmental monitoring : JEM》2002,4(6):967-971
Accumulation of Co, Cu, Cr, Mo, Ni, Pb and Zn was evaluated in a soil profile of an overland flow system used for the post-treatment of urban wastewater. A pilot version of the overland flow system received urban wastewater from five up-flow anaerobic filters filled with bamboo (Bambusa tuldoides) rings. The anaerobic effluent was applied as feed over 18 months at rates varying from 7 to 28 L min(-1), to a vegetated slope length covered with Tifton 85 (Cynodon) sp. grass. Soil and plant samples were collected in triplicate from the top to the bottom of the slope. In addition, the soils were sampled at the depths 0-20 and 20-40 cm. The metal concentrations found in the overall system were compared to those obtained in a control area located at the beginning of the slope onto which nothing was applied. A month of monitoring the urban wastewater of Limeira City (S?o Paulo State, Brazil) showed a drastic change in metals concentration due to the irregular discharge of industrial waste. This irregular discharge introduces Cr, Cu, Ni, Pb and Zn into the system used to treat domestic wastewater. The mass balance indicates the accumulation of metals in the soil and the translocation to the plants; also that they could be evapotranspirated, percolated and discharged. 相似文献
10.
Kramer KJ Dorten WS van het Groenewoud H de Haan E Kramer GN Monteiro L Muntau H Quevauviller P 《Journal of environmental monitoring : JEM》1999,1(1):83-89
In order to control the quality of rare earth determinations in environmental matrices, the Standards, Measurements and Testing Programme (formerly Community Bureau of Reference, BCR) of the European Commission has started a project, the final aim of which is to certify four types of matrices (tuna muscle, mussel tissue, aquatic plant and estuarine sediment) for their contents of a range of rare earth elements (Sc, Y and the lanthanides: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu). The elements U and Th were added to the study. The first part of this project consisted of an interlaboratory study which aimed to test the feasibility of preparation of environmental reference materials and to detect and remove most of the pitfalls observed in rare earth determinations. This paper presents the preparation of the four matrices for the intercomparison study and for the candidate reference material. The main results are presented of the interlaboratory study that was carried out prior to the certification campaign. This collaborative trial is the first attempt ever carried out at this scale to evaluate the state-of-the-art of rare earth determinations in the environment. Its impact on the improvement of chemical measurements will have positive effects on the comparability of data necessary for environmental monitoring. 相似文献