全文获取类型
收费全文 | 1128篇 |
免费 | 5篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 42篇 |
废物处理 | 109篇 |
环保管理 | 89篇 |
综合类 | 89篇 |
基础理论 | 185篇 |
环境理论 | 1篇 |
污染及防治 | 446篇 |
评价与监测 | 109篇 |
社会与环境 | 87篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 48篇 |
2022年 | 139篇 |
2021年 | 112篇 |
2020年 | 44篇 |
2019年 | 40篇 |
2018年 | 51篇 |
2017年 | 61篇 |
2016年 | 54篇 |
2015年 | 37篇 |
2014年 | 51篇 |
2013年 | 106篇 |
2012年 | 44篇 |
2011年 | 45篇 |
2010年 | 28篇 |
2009年 | 46篇 |
2008年 | 33篇 |
2007年 | 27篇 |
2006年 | 32篇 |
2005年 | 31篇 |
2004年 | 22篇 |
2003年 | 18篇 |
2002年 | 26篇 |
2001年 | 9篇 |
2000年 | 8篇 |
1999年 | 6篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 6篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1963年 | 1篇 |
1939年 | 1篇 |
排序方式: 共有1166条查询结果,搜索用时 15 毫秒
131.
Helmy T. El-Zanfaly Mohame R. Lasheen Mohamed M. El-Abagy Shawky A. El-Hawaary Mohamed I. Badawy 《Environment international》1983,9(4):313-317
Water quality for 13 wells in El-Salaam, in a new city near Cairo, has been investigated. Those wells were dug specifically to provide water for a company specializing in broiler poultry production. The water was analyzed for the following bacteriological parameters: total bacterial counts (102–104), total coliforms (<1?102), fecal coliforms (<1?102) fecal streptococci (<1?103), aerobic spore formers (102–104) and total counts for Clostridia (<1?103) per 100 mL. Chemical parameters such as pH, sulphate, alkalinity, hardness, and pesticides indicate that the water is unacceptable for poultry production. This study illustrates the need for monitoring and maintaining the integrity of groundwater sources at El-Salaam. 相似文献
132.
133.
Optimizing the specific surface area of fly ash-based sorbents for flue gas desulfurization 总被引:2,自引:0,他引:2
High performance sorbents for flue gas desulfurization can be synthesized by hydration of coal fly ash, calcium sulfate, and calcium oxide. In general, higher desulfurization activity correlates with higher sorbent surface area. Consequently, a major aim in sorbent synthesis is to maximize the sorbent surface area by optimizing the hydration conditions. This work presents an integrated modeling and optimization approach to sorbent synthesis based on statistical experimental design and two artificial intelligence techniques: neural network and genetic algorithm. In the first step of the approach, the main and interactive effects of three hydration variables on sorbent surface area were evaluated using a full factorial design. The hydration variables of interest to this study were hydration time, amount of coal fly ash, and amount of calcium sulfate and the levels investigated were 4-32 h, 5-15 g, and 0-12 g, respectively. In the second step, a neural network was used to model the relationship between the three hydration variables and the sorbent surface area. A genetic algorithm was used in the last step to optimize the input space of the resulting neural network model. According to this integrated modeling and optimization approach, an optimum sorbent surface area of 62.2m(2)g(-1) could be obtained by mixing 13.1g of coal fly ash and 5.5 g of calcium sulfate in a hydration process containing 100ml of water and 5 g of calcium oxide for a fixed hydration time of 10 h. 相似文献
134.
Metal binding is an important function of humic acids (HAs) in soils, sediments and waters. At pH 2.0, Mn(II) and Co(NH3)6aq3+ bind tightly in one step labeled A to a solid humic acid NHA isolated from a New Hampshire soil. Two consecutive steps are observed for Hg(II) binding. All the binding isotherms fit the Langmuir model in the temperature range 10.0-50.0 degrees C. Stoichiometric site capacities indicate predominant binding by charge-neutralizing HA carboxylate groups for Mn(II) and the second step A of Hg(II) binding. The binding affinity order in step A is Co(NH3)(6)3+>Hg(II)>Mn(II). Metal binding enthalpy and entropy changes fit the linear correlation found previously for binding of other metal cations by solid HAs. Free energy buffering from cooperative enthalpy and entropy changes and lower enthalpies for metal-HA interactions in solution suggest that desolvation of the cations and HA binding sites as well as HA conformational changes to allow for inner-sphere complexation predominate metal binding by hydrated solid HAs. 相似文献
135.
Geochemical variations in aeolian mineral particles from the Sahara-Sahel Dust Corridor 总被引:2,自引:0,他引:2
Moreno T Querol X Castillo S Alastuey A Cuevas E Herrmann L Mounkaila M Elvira J Gibbons W 《Chemosphere》2006,65(2):261-270
The Sahara-Sahel Dust Corridor runs from Chad to Mauritania and expels huge amounts of mineral aerosols into the Atlantic Ocean. Data on samples collected from Algeria, Chad, Niger, and Western Sahara illustrate how corridor dust mineralogy and chemistry relate to geological source and weathering/transport history. Dusts sourced directly from igneous and metamorphic massifs are geochemically immature, retaining soluble cations (e.g., K, Na, Rb, Sr) and accessory minerals containing HFSE (e.g., Zr, Hf, U, Th) and REE. In contrast, silicate dust chemistry in desert basins (e.g., Bodélé Depression) is influenced by a longer history of transport, physical winnowing (e.g., loss of Zr, Hf, Th), chemical leaching (e.g., loss of Na, K, Rb), and mixing with intrabasinal materials such as diatoms and evaporitic salts. Mineral aerosols blown along the corridor by the winter Harmattan winds mix these basinal and basement materials. Dusts blown into the corridor from sub-Saharan Africa during the summer monsoon source from deeply chemically weathered terrains and are therefore likely to be more kaolinitic and stripped of mobile elements (e.g., Na, K, Mg, Ca, LILE), but retain immobile and resistant elements (e.g., Zr, Hf, REE). Finally, dusts blown southwestwards into the corridor from along the Atlantic Coastal Basin will be enriched in carbonate from Mesozoic-Cenozoic marine limestones, depleted in Th, Nb, and Ta, and locally contaminated by uranium-bearing phosphate deposits. 相似文献
136.
Metal concentrations in edible mushrooms following municipal sludge application on forest land 总被引:1,自引:0,他引:1
Benbrahim M Denaix L Thomas AL Balet J Carnus JM 《Environmental pollution (Barking, Essex : 1987)》2006,144(3):847-854
In the context of biosolids utilisation in forestry, effects of sludge application on mushroom metal concentration were studied in six sites of maritime pine forests in the South-West of France. Municipal sludge were applied at a rate of 6 T dry matter per hectare. Edible mushrooms were collected two years after sludge application. As, Cd, Cu, Hg, Pb, Se and Zn concentrations were determined. Results showed a high variability for trace element concentrations in mushrooms collected from control areas. No significant correlation was found between soil parameters (pH and trace elements concentrations) and mushroom trace element concentrations. Even if the concentration of trace metals increased in the soils, sludge application did not affect As, Cu, Se and Zn concentrations in carpophores but slightly increased Cd, Pb and Hg concentrations on some sites. This effect is dependent on sludge type and sites. 相似文献
137.
Environmental Chemistry Letters - Thermodynamic parameters ΔG°, ΔH° and ΔS° are indicators of the possible nature of adsorption. This review summarizes the... 相似文献
138.
Seif Mohamed Abd El-Aziz Tamer Sayed Mohamed Wang Zaizhao 《Environmental science and pollution research international》2021,28(16):19783-19798
Environmental Science and Pollution Research - Arsenic (As) indelibly exists in the environment and may reach to a food chain. Flavors and herbs are recognized sources of natural antioxidants that... 相似文献
139.
Madboli Abd El-Nasser A. Seif Mohamed M. 《Environmental science and pollution research international》2021,28(14):17613-17626
Environmental Science and Pollution Research - The aim of this study is to describe the existence of the inflammatory marker nuclear factor kappa light chain B lymphocyte protein (NF-?B P65)... 相似文献
140.
El Rasafi Taoufik Pereira Ruth Pinto Glória Gonçalves Fernando J. M. Haddioui Abdelmajid Ksibi Mohamed Römbke Jörg Sousa José Paulo Marques Catarina R. 《Environmental science and pollution research international》2021,28(13):15782-15793
Environmental Science and Pollution Research - The contamination left by abandoned mines demands sustainable mitigation measures. Hence, the aim of this study was to examine the phytoremediator... 相似文献