全文获取类型
收费全文 | 404篇 |
免费 | 5篇 |
国内免费 | 12篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 7篇 |
环保管理 | 65篇 |
综合类 | 141篇 |
基础理论 | 64篇 |
污染及防治 | 96篇 |
评价与监测 | 14篇 |
社会与环境 | 18篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 5篇 |
2020年 | 5篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 36篇 |
2012年 | 7篇 |
2011年 | 21篇 |
2010年 | 11篇 |
2009年 | 5篇 |
2008年 | 13篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 8篇 |
2004年 | 12篇 |
2003年 | 19篇 |
2002年 | 17篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 7篇 |
1997年 | 4篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 8篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1985年 | 3篇 |
1980年 | 6篇 |
1978年 | 4篇 |
1975年 | 4篇 |
1969年 | 4篇 |
1967年 | 3篇 |
1966年 | 3篇 |
1965年 | 5篇 |
1963年 | 4篇 |
1962年 | 10篇 |
1961年 | 4篇 |
1960年 | 7篇 |
1959年 | 6篇 |
1958年 | 6篇 |
1957年 | 8篇 |
1956年 | 5篇 |
1955年 | 3篇 |
1932年 | 3篇 |
排序方式: 共有421条查询结果,搜索用时 46 毫秒
101.
102.
Joseph J. Ball Richard A. Keller 《Journal of the Air & Waste Management Association (1995)》2013,63(6):631-633
An argon ion laser emits several laser lines In the visible region of the optical spectrum. The absorption coefficients of N02 at these laser emissions were measured in a multiple pass absorption cell. A differential technique, in which the ratio of the transmitted intensities of the argon laser emissions is measured, is described to determine the concentration of N02 in a polluted atmosphere over path lengths of several kilometers. Measurement of ratios eliminates interferences from particle scattering and thermal index gradients. Evaluation of the data taken in the 48 meter multipass cell indicates that concentrations of N02 less than one part per million could be determined in a 1 km optical path. 相似文献
103.
104.
The impact of invasive aquatic plants on ecosystem services and human well-being in Wular Lake,India
Regional Environmental Change - Alien invasive species cause significant impacts on ecosystems and economies, but the impacts on human well-being and livelihoods are less well known. Negative... 相似文献
105.
S. Otto W. Keller N. Drescher 《Journal of environmental science and health. Part. B》2013,48(3):179-191
Abstract A new gas chromatographic method reliable in the microgram range, was developed to measure ETU residues in various crops. Contrary to previously published procedures, this new method does not require prior derivatization of the ETU. The limit of sensitivity was shown to be 0.01 ppm using the flame photometric detector, FPD (sulfur mode, 394 nm). 相似文献
106.
de Medeiros Engelmann Pâmela dos Santos Victor Hugo Jacks Mendes Moser Letícia Isabela do Canto Bruzza Eduardo Barbieri Cristina Barazzetti Barela Pâmela Susin de Moraes Diogo Pompéu Augustin Adolpho Herbert Goudinho Flávio Soares Melo Clarissa Lovato Ketzer João Marcelo Medina Rodrigues Luiz Frederico 《Environmental science and pollution research international》2017,24(26):21398-21411
Environmental Science and Pollution Research - In Brazil, landfills are commonly used as a method for the final disposal of waste that is compliant with the legislation. This technique, however,... 相似文献
107.
OBJECTIVES: To better understand the characteristics of crashes involving senior drivers 65 and older, studies of these crashes were reviewed. METHODS: The review focused primarily on North American studies published since 1990. Studies point to important differences between the crashes of senior drivers and those of younger drivers. RESULTS. Numerous studies have found that senior drivers' crashes are much more likely than crashes of younger drivers to occur at intersections. Senior drivers have particularly high rates of involvement in intersection crashes when they are turning, and even more so when they are turning left. Senior drivers are more likely than younger drivers to have been at fault in these situations, typically because they failed to yield the right-of-way, disregarded the traffic signal, or committed some other traffic violation. Studies also suggest that the extent of overinvolvement of senior drivers in certain types of crashes generally increases with advancing age. CONCLUSIONS. The extent to which the distinctive characteristics of senior drivers' crashes may be due to changing travel patterns associated with aging, or physical or cognitive impairments related to the aging process, is unclear. Further research is needed to understand the pre-crash circumstances of older drivers' intersection crashes. 相似文献
108.
A predictive model for copper partitioning to suspended particulate matter in river waters 总被引:3,自引:0,他引:3
A chemical equilibrium-based predictive model expressing Cu partitioning as a function of aqueous and solid phase characteristics was developed. The model takes into account only the most important factors that govern Cu partitioning, and therefore results in a relatively simple formulation. It assumes particulate organic carbon (POC) and dissolved organic carbon (DOC) binding sites play the most important role in solid and aqueous phases. The model formulation assumed one-surface site and two dissolved organic matter (DOM) sites, and included the "solids effect". Proton effects were considered for both the particle surface sites and the DOM. The model was calibrated with data for samples collected from the Susquehanna River, and validated with White Clay Creek and Delaware River samples. Copper partitioning in natural water systems with different pH, and concentrations of alkalinity, DOC, POC, total suspended solids (TSS), and total copper was predicted reasonably well. 相似文献
109.
Herbert P Cabrita MJ Ratola N Laureano O Alves A 《Journal of environmental science and health. Part. B》2006,41(7):1171-1186
The concentration of biogenic amines and free amino acids was studied in 102 Portuguese wines and 18 musts from Alentejo demarcated (D.O.C.) regions. Most wines were commercial, except for 38 monovarietals obtained by micro vinification. Musts from the varieties used to produce the latter wines were also studied. Both biogenic amines and free amino acids were analyzed by HPLC using fluorescence detection for their o-phthalaldehyde/fluorenylmethyl chloroformate (OPA/FMOC) derivatives. The most significant amines (average 10.8 mg/L for histamine+tyramine in red, and 7.4 mg/L for white wines) were found to be present at low levels and, although no important relationship between each individual biogenic amine could be obtained, the total amine content depends significantly on the assimilable amino acid content in wine. 相似文献
110.
Humic substances from eight soils of varying properties were extracted by two different methods: (1) the traditional NaOH-extraction with subsequent acidification to different pH (approximately 1 to approximately 12) and sequential extractions using 0.01 M NaNO(3) at incremental pH (approximately 1 to approximately 11). Cumulative organic matter (OM) in the sequential extractions showed properties that were consistent with NaOH-extracted OM. The release of Al and Fe in the sequential extractions was closely related with the release of organic carbon (OC). The ratio of OC associated with humic acid (HA) and fulvic acid (FA) (the HA:FA ratio) varied widely among the soils indicating heterogeneity in their OM composition. However, a significant correlation between this HA:FA ratio and the NaOH extractable %OC content of the soils is indicative of the possible relationship between them. Between pH 5 and 7, which is a typical soil solution pH, a significant amount of HA-associated OC was soluble. In modeling metal speciation in soil solutions, it has been assumed that all dissolved organic carbon (DOC) that is active toward metal binding is associated with FA. The results of this study indicate that the validity of these assumptions based on model sensitivity alone is questionable. 相似文献