全文获取类型
收费全文 | 6884篇 |
免费 | 340篇 |
国内免费 | 1087篇 |
专业分类
安全科学 | 403篇 |
废物处理 | 310篇 |
环保管理 | 697篇 |
综合类 | 2775篇 |
基础理论 | 1777篇 |
环境理论 | 1篇 |
污染及防治 | 1344篇 |
评价与监测 | 474篇 |
社会与环境 | 367篇 |
灾害及防治 | 163篇 |
出版年
2024年 | 17篇 |
2023年 | 53篇 |
2022年 | 176篇 |
2021年 | 145篇 |
2020年 | 165篇 |
2019年 | 135篇 |
2018年 | 256篇 |
2017年 | 289篇 |
2016年 | 324篇 |
2015年 | 250篇 |
2014年 | 245篇 |
2013年 | 373篇 |
2012年 | 712篇 |
2011年 | 557篇 |
2010年 | 320篇 |
2009年 | 305篇 |
2008年 | 326篇 |
2007年 | 334篇 |
2006年 | 312篇 |
2005年 | 605篇 |
2004年 | 705篇 |
2003年 | 575篇 |
2002年 | 207篇 |
2001年 | 186篇 |
2000年 | 148篇 |
1999年 | 122篇 |
1998年 | 75篇 |
1997年 | 60篇 |
1996年 | 44篇 |
1995年 | 56篇 |
1994年 | 30篇 |
1993年 | 23篇 |
1992年 | 25篇 |
1991年 | 25篇 |
1990年 | 19篇 |
1989年 | 14篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 8篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1974年 | 4篇 |
1972年 | 6篇 |
1971年 | 4篇 |
1970年 | 4篇 |
1967年 | 4篇 |
排序方式: 共有8311条查询结果,搜索用时 15 毫秒
991.
Pollard SJ Farmer JG Knight DM Young PJ 《Environmental pollution (Barking, Essex : 1987)》2002,117(1):5-8
Commercial mono- and polyclonal enzyme-linked immunosorbent assay (ELISA) systems were applied to the on-site analysis of weathered hydrocarbon-contaminated soils at a former integrated steelworks. Comparisons were made between concentrations of solvent extractable matter (SEM) determined gravimetrically by Soxhlet (dichloromethane) extraction and those estimated immunologically by ELISA determination over a concentration range of 2000-330,000 mg SEM/kg soil dry weight. Both ELISA systems tinder-reported for the more weathered soil samples. Results suggest this is due to matrix effects in the sample rather than any inherent bias in the ELISA systems and it is concluded that, for weathered hydrocarbons typical of steelworks and coke production sites, the use of ELISA requires careful consideration as a field technique. Consideration of the target analyte relative to the composition of the hydrocarbon waste encountered appears critical. 相似文献
992.
Andreas Ahrens Arnim von Gleich und Lothar Li?ner 《Umweltwissenschaften und Schadstoff-Forschung》2002,14(3):165-169
Ohne Zusammenfassung
Online First: 27. 03. 2002
‚Sustainable Substitution of Hazardous Substances‚; Projektbeschreibung unter wwwoekopolde oder wwwfh-hamburgdelpers/gleich_von bzw. www.uni-hamburgde/kooperationssteI1e-hh. Das Vorhaben wird vom Bundesministerium für Bildung und Forschung (BMBF) im F?rderschwerpunkt ‚Rahmenbedingungen für Innovationen
zum nachhaitigen Wirtschaften’ (RIW) gef?rdert und von der GSF als Projekttr?ger betreut (FkZ. O7Riw4). 相似文献
993.
994.
995.
Walker TR Young SD Crittenden PD Zhang H 《Environmental pollution (Barking, Essex : 1987)》2003,121(1):11-21
Trace metal composition of winter snowpack, snow-melt filter residues and top-soil samples were determined along three transects through industrial towns in the Usa basin, North-East Russia: Inta, Usinsk and Vorkuta. Snow was analysed for Ag, Al, As, Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr and Zn using ICP-MS (Ca and K by F-AAS for Vorkuta only), pH and acidity/alkalinity. Filter residues were analysed for: Al, Ba, Ca, Cd, Cu, K, Mg, Mn, Ni, Pb, Sr and Zn using F-AAS and GF-AAS; top-soil samples were analysed for Ba, Cu, Mg, Mn, Na, Ni, Pb, Sr, Zn using F-AAS. Results indicate elevated concentrations of elements associated with alkaline combustion ash around the coal mining towns of Vorkuta and Inta. There is little evidence of deposition around the gas and oil town of Usinsk. Atmospheric deposition in the vicinity of Vorkuta, and to a lesser extent Inta, added significantly to the soil contaminant loading as a result of ash fallout. Acid deposition was associated with pristine areas whereas alkaline combustion ash near to emission sources more than compensated for the acidity caused by SO2. 相似文献
996.
Choi JH Kim YH Joo DJ Choi SJ Ha TW Lee DH Park IH Jeong YS 《Journal of the Air & Waste Management Association (1995)》2003,53(1):92-101
The characteristics of ammonia removal by two types of biofilter (a standard biofilter with vertical gas flow and a modified biofilter with horizontal gas flow) were investigated. A mixture of organic materials such as compost, bark, and peat was used as the biofilter media based on the small-scale column test for media selection. Complete removal capacity, defined as the maximum inlet load of ammonia that was completely removed, was obtained. The modified biofilter showed complete removal up to 1.0 g N/kg dry material/day. However, the removal capacity of the standard biofilter started to deviate from complete removal around 0.4 g N/kg dry material/day, indicating that the modified biofilter system has higher removal efficiency than the standard upflow one. In kinetic analysis of the biological removal of ammonia in each biofilter system, the maximum removal rate, Vm, was 0.93 g N/kg dry material/day and the saturation constant, Ks, was 32.55 ppm in the standard biofilter. On the other hand, the values of Vm and Ks were 1.66 g N/kg dry material/day and 74.25 ppm, respectively, in the modified biofilter system. 相似文献
997.
A simple compressed-gas driven system for field processing and extracting water for subsequent analyses of hydrophobic organic compounds is presented. The pumping device is a pneumatically driven pump and filtration system that can easily clarify at 4 L/min. The extraction device uses compressed gas to drive filtered water through two parallel XAD-2 resin columns, at about 200 mL/min. No batteries or inverters are required for water collection or processing. Solvent extractions were performed directly in the XAD-2 glass columns. Final extracts are cleaned-up on Florisil cartridges without fractionation and contaminants analyzed by GC-MS. Method detection limits (MDLs) and recoveries for dissolved organic contaminants, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and pesticides are reported along with results of surface water analysis for the San Francisco Bay, CA. 相似文献
998.
999.
1000.