全文获取类型
收费全文 | 2571篇 |
免费 | 84篇 |
国内免费 | 890篇 |
专业分类
安全科学 | 186篇 |
废物处理 | 149篇 |
环保管理 | 209篇 |
综合类 | 1282篇 |
基础理论 | 456篇 |
污染及防治 | 919篇 |
评价与监测 | 124篇 |
社会与环境 | 94篇 |
灾害及防治 | 126篇 |
出版年
2024年 | 1篇 |
2023年 | 43篇 |
2022年 | 121篇 |
2021年 | 95篇 |
2020年 | 86篇 |
2019年 | 89篇 |
2018年 | 78篇 |
2017年 | 109篇 |
2016年 | 113篇 |
2015年 | 154篇 |
2014年 | 220篇 |
2013年 | 269篇 |
2012年 | 206篇 |
2011年 | 214篇 |
2010年 | 197篇 |
2009年 | 169篇 |
2008年 | 170篇 |
2007年 | 130篇 |
2006年 | 151篇 |
2005年 | 105篇 |
2004年 | 89篇 |
2003年 | 78篇 |
2002年 | 85篇 |
2001年 | 112篇 |
2000年 | 76篇 |
1999年 | 73篇 |
1998年 | 72篇 |
1997年 | 51篇 |
1996年 | 39篇 |
1995年 | 36篇 |
1994年 | 31篇 |
1993年 | 21篇 |
1992年 | 18篇 |
1991年 | 7篇 |
1990年 | 14篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有3545条查询结果,搜索用时 0 毫秒
981.
Methyl iodide (MeI) is a promising alternative to methyl bromide in soil fumigation. The pest-control efficacy and ground water contamination risks of MeI as a fumigant are highly related to its gas-phase distribution and leaching after soil application. In this study, the distribution and leaching of MeI in soil following shank injection and subsurface drip application were investigated. Methyl iodide (200 kg ha(-1)) was directly injected or drip-applied at a 20-cm depth into Arlington sandy loam (coarse-loamy, mixed, thermic Haplic Durixeralfs) columns (12-cm i.d., 70-cm height) tarped with virtually impermeable film. Concentration profiles of MeI in the soil air were monitored for 7 d. Methyl iodide diffused rapidly after soil application, and reached a 70-cm depth within 2 h. Relative to shank injection, drip application inhibited diffusion, resulting in significantly lower concentration profiles in the soil air. Seven days after MeI application, fumigated soil was uncapped, aerated for 7 d, and leached with water. Leaching of MeI was significant from the soil columns under both application methods, with concentrations of >10 mug L(-1) in the early leachate. The leaching was greater following shank injection than drip application, with an overall potential of 33 g ha(-1) for shank injection and 19 g ha(-1) for drip application. Persistent residues of MeI remaining in soils after leaching were 50 to 240 ng kg(-1), and the contents were slightly higher following shank injection than drip application. The results suggest that fumigation with MeI may pose a risk of ground water contamination in vulnerable areas. 相似文献
982.
Recently, Homeswest in Western Australia and Murdoch University developed a project to construct low allergen houses (LAH) in a newly developed suburb. All potential volatile organic compound (VOC) emission materials used in LAH are required to be measured before the construction of LAH, to ensure they are low VOCs emission materials. To protect people sensitive to exposure to VOCs it is important to evaluate and select low VOCs emitting paints. In this paper, therefore, twelve different paints provided by local manufacturers were selected for analysis to characterize total volatile organic compounds (TVOC) emissions. Emissions of TVOCs from six organic solvent-soluble paints and six water-soluble paints were evaluated using a small test chamber under controlled temperature, relative humidity and air exchange rates. The major volatile organic compounds in these paints were also identified. The time dependence of TVOC emissions from paint products in the chamber was evaluated. TVOC emissions from organic solvent-soluble and water-soluble paints were compared. The influence of air exchange rate on the TVOC concentrations emitted from organic solvent-soluble and water-soluble paints was also investigated. A double-exponential equation was used to evaluate emission characteristics of TVOC from paint products. With this double-exponential model, the physical processes of TVOC emissions can be explained. A variety of emission parameters can be calculated and used to estimate real indoor TVOCs concentrations. 相似文献
983.
关于硝酸铵爆炸事前评价的探讨 总被引:14,自引:2,他引:12
硝酸铵主要用作肥料大量使用 ,或作为制造工业炸药的重要原料 ,是一种强氧化剂 ,同时又是自反应性物质 ,国内外因对其控制或管理不当 ,曾发生多起重大爆炸事故。为防止在生产、贮存、运输以及使用过程中的爆炸事故 ,笔者探讨并提出了硝酸铵爆炸事前评价模式。这种评价方法 ,对控制和预防硝酸铵发生事故 ,有借鉴、推广和现实意义。 相似文献
984.
生物工程对提高路基安全稳定的研究 总被引:9,自引:3,他引:6
详细阐述了路基边坡遭受侵蚀破坏的机理及边坡破坏的表现方式 ;着重分析了植被措施对路基的重要防护作用 ;提出了综合生物工程技术应在路基工程中广泛应用。 相似文献
985.
吸附技术处理污水是目前环境污染治理的常用技术之一 ,吸附剂的选择是该技术的关键。粘土类吸附剂具有比表面大 ,吸附容量大等特点 ,对污染物具有良好的去除效果 ;且来源广 ,价格低廉 ,不造成二次污染 ,在污水处理方面具有广阔的应用前景。 相似文献
986.
987.
988.
989.
990.