全文获取类型
收费全文 | 3597篇 |
免费 | 60篇 |
国内免费 | 35篇 |
专业分类
安全科学 | 200篇 |
废物处理 | 117篇 |
环保管理 | 947篇 |
综合类 | 348篇 |
基础理论 | 871篇 |
环境理论 | 7篇 |
污染及防治 | 808篇 |
评价与监测 | 231篇 |
社会与环境 | 132篇 |
灾害及防治 | 31篇 |
出版年
2023年 | 14篇 |
2022年 | 23篇 |
2021年 | 30篇 |
2020年 | 30篇 |
2019年 | 38篇 |
2018年 | 49篇 |
2017年 | 70篇 |
2016年 | 86篇 |
2015年 | 76篇 |
2014年 | 76篇 |
2013年 | 454篇 |
2012年 | 142篇 |
2011年 | 181篇 |
2010年 | 117篇 |
2009年 | 135篇 |
2008年 | 158篇 |
2007年 | 196篇 |
2006年 | 138篇 |
2005年 | 118篇 |
2004年 | 124篇 |
2003年 | 128篇 |
2002年 | 110篇 |
2001年 | 64篇 |
2000年 | 78篇 |
1999年 | 49篇 |
1998年 | 56篇 |
1997年 | 44篇 |
1996年 | 59篇 |
1995年 | 57篇 |
1994年 | 64篇 |
1993年 | 52篇 |
1992年 | 46篇 |
1991年 | 39篇 |
1990年 | 38篇 |
1989年 | 31篇 |
1988年 | 40篇 |
1987年 | 30篇 |
1986年 | 34篇 |
1985年 | 33篇 |
1984年 | 30篇 |
1983年 | 37篇 |
1982年 | 48篇 |
1981年 | 47篇 |
1980年 | 25篇 |
1979年 | 28篇 |
1978年 | 25篇 |
1977年 | 29篇 |
1976年 | 13篇 |
1974年 | 10篇 |
1972年 | 11篇 |
排序方式: 共有3692条查询结果,搜索用时 15 毫秒
991.
Change has characterized nearly all aspects of the air pollution control industry during the last year. The supplier companies are changing due to mergers and increased activity from foreign suppliers. Both the products and the markets are changing due to developing technologies and a changing regulatory picture. Waste-to energy and VOC control are seen as growth industries in the U.S., and a resurgence is expected in the FGD and utility particulate control arenas over the next ten years. Expansion of air pollution control companies into hazardous 相似文献
992.
Ralph J. Portier Glen P. Curole Robert M. Conger Laura M. Basirico Caroline Metosh‐Dickey 《补救:环境净化治理成本、技术与工艺杂志》2010,20(4):105-117
In situ remediation of aniline from soils and groundwater using biological and physical treatments was conducted at the BASF Corporation facility in Geismar, Louisiana. To mitigate the migration of aniline, remediate contaminated soil and groundwater, and determine concentrations, 24 immobilized microbe bioreactors were fixed in the subsoil, and a horizontal recovery well and 7 monitoring wells were installed. Soil and monitoring wells were sampled quarterly to assess bioplug impact on the aniline concentrations. The recovery well was sampled monthly to estimate the pounds of aniline removed from groundwater. Soil pH, composition, and microbial counts were used to estimate the fate and transport. Aniline levels were lowered significantly after remediation and total cancer risk was below levels for industrial sites, as established by State of Louisiana Risk Evaluation/Corrective Action Program guidelines. © 2010 Wiley Periodicals, Inc. 相似文献
993.
John H. Martin Alan R. Collins Robert G. Diener P.E. 《Journal of the Air & Waste Management Association (1995)》2013,63(11):864-870
Abstract This article reports on development of a protocol for characterizing municipal solid waste (MSW). This protocol is similar to that recommended by the American Society for Testing and Materials but includes a distinction between pure and mixed loads of MSW. Thirteen component categories were used with a focus on material feed stock for composting, recycling, and reuse. The required number of samples was determined to achieve a 80%, 90%, and 95% statistical accuracy for characterizing MSW categories at 1% and 2% sampling error. This study found that a maximum of 25 randomly collected samples of 200 pounds will reflect each component category of mixed load MSW with at least a 95% confidence level and 2% error. This protocol was successfully tested in Monongalia County, West Virginia, to provide a “snapshot” MSW characterization during early summer. 相似文献
994.
Katerina Bačeva Trajče Stafilov Robert Šajn Claudiu Tănăselia 《Environmental science and pollution research international》2013,20(12):8763-8779
A systematic study was carried out to investigate air deposition and to explore the natural distribution and enrichment (contamination) with trace elements in the small area (cca. 13 km2) of an antimony-arsenic-thallium mineralization outcrop at an abandoned mine “Allchar.” The mine is located on the northwestern part of Ko?uf Mount, Republic of Macedonia. The locality of Allchar is unique in its mineral composition; besides a very intriguing mineral, lorandite, there are 45 other minerals, some of which are rare. The distribution of 53 elements (with special attention to As, Sb, and Tl) were detected in 69 moss samples from eight various species collected from this area. Moss samples were analyzed following microwave digestion by inductively coupled plasma–mass spectrometry and inductively coupled plasma–atomic emission spectrometry. It was found that the atmospheric deposition for As in the moss samples on or around the Allchar mine is >6.5 times higher and for Tl is 19 times higher compared to values for the samples from the rest of the Allchar area. By the application of multivariate cluster and R-mode factor analyses (FA), five geochemical associations were determined. Cluster and R-mode FA were used to identify and characterize element associations, and five associations of elements were determined by the method of multivariate statistics. F1 (Co, Cr, Fe, Sc, Li, V, Ga, Y, Ni, Mn, Al, La-Lu, Cu, Ge, Be, Bi, and Hf); F2 (As, Tl, Sb, and Mg); F3 (Rb, Cs, and Mo); F4 (Sr, Ba, Hf, Zr, La-Lu, and Bi), and F5 (Cd, Zn, Ag, and Cu). 相似文献
995.
Pinder RW Appel KW Dennis RL 《Environmental pollution (Barking, Essex : 1987)》2011,159(10):3138-3141
Reactive nitrogen can travel far from emission sources and impact sensitive ecosystems. From 2002 to 2006, policy actions have led to decreases in NO(x) emissions from power plants and motor vehicles. In this study, atmospheric chemical transport modeling demonstrates that these emissions reductions have led to a downward trend in ambient measurements of transported reactive nitrogen, especially atmospheric concentrations and wet deposition of nitrate. The trend in reduced nitrogen, namely ammonium, is ambiguous. As reduced nitrogen becomes a larger fraction of the reactive nitrogen budget, wide-spread NH(3) measurements and improved NH(3) emissions assessments are a critical need. 相似文献
996.
In this paper, we assess climate change impacts on an intensively managed grassland system at the Swiss Plateau using the
process-based grassland model PROGRASS. Taking the CO2 fertilization into account, we find increasing yield levels (in the range of 10–24%) and sharp increases in production risks
for an illustrative climate change scenario that suggests a marked increase in temperature and decrease in summer rainfall.
Climate change–induced increases in the coefficients of variation of grassland yields are in the range of 21 and 50%. This
finding underpins that additional risk management strategies are needed to cope with climate-change impacts on grassland production.
The outputs from the grassland model are evaluated economically using certainty equivalents, i.e., accounting for mean quasi
rents and production risks. To identify potential risk management strategies under current and future climatic conditions,
we consider adjustments of production intensity and farm-level yield insurance. The impact of climate change on production
intensities is found to be ambiguous: farmers’ will increase intensity under unconstrained production conditions, but will
decrease production intensity in the presence of a cross-compliance scheme. Our results also show that the considered insurance
scheme is a powerful tool to manage climate risks in grassland production under current and future conditions because it can
reduce the coefficients of variation of quasi rents by up to 50%. However, we find that direct payments tend to reduce farmers’
incentives to use such insurance scheme. 相似文献
997.
This paper explores the impact of the frame in which people interpret global warming. In 1999, 637 respondents completed a mail survey in five counties in central Pennsylvania. Half of the sample received questionnaires that framed global warming in terms of the local impacts of mitigation policies, whereas the other half received questionnaires that framed global warming in terms of the national impacts of mitigation policies. The results show a statistically significant but small difference between the local and national frames in the respondents' willingness to support government policies, as well as to take voluntary actions to mitigate climate change. 相似文献
998.
999.
1000.
Perfluorooctane sulfonate (PFOS) is a globally distributed persistent organic pollutant that has been found to bioaccumulate and biomagnify in aquatic food webs. Although principally in its linear isomeric configuration, 21–35% of the PFOS manufactured via electrochemical fluorination is produced as a branched structural isomer. PFOS isomer patterns were investigated in multiple tissues of polar bears (Ursus maritimus) from East Greenland. The liver (n = 9), blood (n = 19), brain (n = 16), muscle (n = 5), and adipose (n = 5) were analyzed for linear PFOS (n-PFOS), as well as multiple mono- and di-trifluoromethyl-substituted branched isomers. n-PFOS accounted for 93.0 ± 0.5% of Σ-PFOS isomer concentrations in the liver, whereas the proportion was significantly lower (p < 0.05) in the blood (85.4 ± 0.5%). Branched isomers were quantifiable in the liver and blood, but not in the brain, muscle, or adipose. In both the liver and blood, 6-perfluoromethylheptane sulfonate (P6MHpS) was the dominant branched isomer (2.61 ± 0.10%, and 3.26 ± 0.13% of Σ-PFOS concentrations, respectively). No di-trifluoromethyl-substituted isomers were detectable in any of the tissues analyzed. These tissue-specific isomer patterns suggest isomer-specific pharmacokinetics, perhaps due to differences in protein affinities, and thus differences in protein interactions, as well transport, absorption, and/or metabolism in the body. 相似文献