全文获取类型
收费全文 | 247篇 |
免费 | 0篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 22篇 |
环保管理 | 27篇 |
综合类 | 52篇 |
基础理论 | 54篇 |
污染及防治 | 65篇 |
评价与监测 | 19篇 |
社会与环境 | 4篇 |
出版年
2023年 | 1篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 5篇 |
2019年 | 8篇 |
2018年 | 4篇 |
2017年 | 10篇 |
2016年 | 15篇 |
2015年 | 13篇 |
2014年 | 17篇 |
2013年 | 24篇 |
2012年 | 9篇 |
2011年 | 11篇 |
2010年 | 9篇 |
2009年 | 15篇 |
2008年 | 18篇 |
2007年 | 10篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2004年 | 8篇 |
2003年 | 7篇 |
2002年 | 6篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1994年 | 1篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1986年 | 4篇 |
1984年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1940年 | 1篇 |
1938年 | 2篇 |
排序方式: 共有249条查询结果,搜索用时 15 毫秒
21.
22.
23.
The Influence of Trace Elements on Environment; Distribution of Thallium in Fluids of Volcanic Areas
During weathering of igneous rocks thallium can be readily mobilized as TI+ in aqueous phase and picked up by plants. In this way it can reach the alimentary cycle of both livestock and humans. Since the toxicity of thallium is well-established, an analytical procedure for its determination is optimized in order to contribute to the knowledge of TI+ distribution in specific environments. The analytical method is applied to fluid phase samples from Vulcano island (Italy) and from other volcanic areas. 相似文献
24.
Feedbacks between bivalve density, flow, and suspended sediment concentration on patch stable states
We explore the role of biophysical feedbacks occurring at the patch scale (spatial scale of tens of meters) that influence bivalve physiological condition and affect patch stability by developing a numerical model for the pinnid bivalve, Atrina zelandica, in cohesive sediments. Simulated feedbacks involve bivalve density, flow conditions (assumed to be primarily influenced by local water depth and peak current speed), suspended sediment concentration (evaluated through a balance between background concentration, deposition, and erosion), and changes in the physiology of Atrina derived from empirical study. The model demonstrates that high bivalve density can lead to skimming flow and to a concomitant decrease in resuspension that will affect suspended sediment concentration over the patch directly feeding back on bivalve physiology. Consequently, for a given flow and background suspended sediment load, the stability of a patch directly depends on the size and density of bivalves in the patch. Although under a range of conditions patch stability is ensured independently of bivalve density, simulations clearly indicate that sudden changes in bivalve density or suspended sediment concentration can substantially affect patch structure and lead to different stable states. The model highlights the role of interactions between organisms, flow, and broader scale environmental conditions in providing a mechanistic explanation for the patchy occurrence of benthic suspension feeders. 相似文献
25.
Lucia Fanini Giovanni Maria Marchetti Felicita Scapini Omar Defeo 《Marine Biology》2007,152(5):1169-1179
26.
Trotta F Cravotto G Casile G 《Environmental science and pollution research international》2003,10(3):144-146
Chiral, atropisomeric 2,2'-dihydroxy-1,1'-binaphthyl has been extensively used to direct asymmetric processes. Its key role in asymmetric catalysis has spurred efforts to synthesize it in the optically pure form, but the reported synthetic routes have a significant environmental impact. In an aqueous peroxydase-cyclodextrin system the oxidative coupling of 2-naphthol took place very rapidly in almost quantitative yield and resulted in an enantiomeric excess. This one-pot synthesis do not require any organic solvents and oxidising metal cations. 相似文献
27.
Sonia Mosca Giovanni Graziani Werner Klug Roberto Bellasio Roberto Bianconi 《Atmospheric environment (Oxford, England : 1994)》1998,32(24):993
This paper describes the statistical methodology applied to evaluate the performance of the long-range dispersion models that were used in the modelling activities of ETEX (European Tracer EXperiment). The availability of a large number of models makes this exercise rather unique. These models are used for the practical purpose to quantify the contamination effects over a vast area, following a hypothetical accidental release of harmful material. This makes the quality judgement that could be attributed to the results of each model particularly important.The statistical indicators considered to be the most effective for the evaluation of long-range dispersion models are introduced and commented, with specific examples in the frame of ETEX simulations. The importance of using several indices and critically interpreting the results is discussed. 相似文献
28.
Marina ACCORNERO Lin JIANG Eugenio NAPOLI Marco CREMONINI Giovanni FERRO Federica BELLORO Maosheng ZHONG 《Frontiers of Environmental Science & Engineering》2015,9(3):465
A probabilistic analysis was performed on soil arsenic concentration data from 4 brownfield sites at Beijing (Chaoyang and Haidian Districts), involved in environmental assessment studies. The available data sets were processed to provide a statistical characterization of the background populations and differentiate “anomalous data” from the natural range of variation of arsenic concentrations in soil. The site-specific background distributions and the existing wide-scale background values defined for the Beijing area were compared, discussing related implications for the definition of metal contamination soil screening levels (SSLs) in site assessment studies. The statistical analysis of As data sets discriminated site-specific background populations, encompassing 88% to 94% of the sample data, from outliers values, associated with either subsoil natural enrichments or possible anthropogenic releases. Upper Baseline Concentration (UBC) limits (+ 2σ level), including most of the site-specific metal background variability, were derived based on the statistical characterization of the background populations. Sites in the Chaoyang South District area had UBC values in the range 10.4–12.6 mg·kg-1. These ranges provide meaningful SSL values to be adopted for As in local site assessment studies. Using the wide-scale background value for the Beijing area would have erroneously classified most of the areas in the subject sites as potentially contaminated. 相似文献
29.
Oleksandra Ganzenko Nihal Oturan Ignasi Sirés David Huguenot Eric D. van Hullebusch Giovanni Esposito Mehmet A. Oturan 《Environmental Chemistry Letters》2018,16(1):281-286
Cytostatic drugs are a troublesome class of emerging pollutants in water owing to their potential effects on DNA. Here we studied the removal of 5-fluorouracil from water using the electro-Fenton process. Galvanostatic electrolyses were performed with an undivided laboratory-scale cell equipped with a boron-doped diamond anode and a carbon felt cathode. Results show that the fastest degradation and almost complete mineralization was obtained at a Fe2+ catalyst concentration of 0.2 mM. The absolute rate constant for oxidation of 5-fluorouracil by hydroxyl radicals was 1.52 × 109 M?1 s?1. Oxalic and acetic acids were initially formed as main short-chain aliphatic by-products, then were completely degraded. After 6 h the final solution mainly contained inorganic ions (NH4 +, NO3 ? and F?) and less than 10% of residual organic carbon. Hence, electro-Fenton constitutes an interesting alternative to degrade biorefractory drugs. 相似文献
30.
Hydrogeochemical considerations about the origin of groundwater salinization in some coastal plains of Elba Island (Tuscany,Italy) 总被引:1,自引:0,他引:1
Elena Giménez-Forcada Alberto Bencini Giovanni Pranzini 《Environmental geochemistry and health》2010,32(3):243-257
Several coastal plains of the Elba Island (Marina di Campo, Portoferraio, Schiopparello, Mola, Porto Azzurro and Barbarossa
plains) in Tuscany (Italy) were studied to determine the causes of decline in groundwater quality, using major ion chemistry
to establish the causes of groundwater salinization. The study demonstrates that salinization of coastal plain alluvial aquifers
is not simply linked to seawater intrusion but is also intimately related to inflows from adjacent aquifers. Ionic ratios,
correlation graphs and distribution value maps were employed as the means to understand the hydrochemistry of the study areas.
The Mg/Cl ratio in particular can be considered a good tracer to distinguish the main salinization processes that control
groundwater chemistry. Seawater intrusion only partly determines the chemistry of some groundwaters, which generally belong
to a chloride facies where the salinity is derived principally from freshwater–seawater mixing and the participation of cation
exchange. Proceeding inland groundwater quality seems to be principally determined by the inflow of Mg, Ca-HCO3 or Ca, Na-HCO3 waters formed from the weathering of silicate minerals in adjoining aquifers. Hydrolysis of these minerals is of prime importance
in controlling groundwater chemistry in adjacent alluvial plains. The lateral recharge flows introduce water with a different
chemical composition and this variable of freshwater recharge changes the hydrochemistry as a result of mixing between two
or more waters types. This situation is further complicated when seawater and base exchange reactions participate, due to
seawater intrusion. 相似文献