全文获取类型
收费全文 | 8410篇 |
免费 | 71篇 |
国内免费 | 34篇 |
专业分类
安全科学 | 142篇 |
废物处理 | 459篇 |
环保管理 | 570篇 |
综合类 | 1394篇 |
基础理论 | 1925篇 |
环境理论 | 9篇 |
污染及防治 | 2822篇 |
评价与监测 | 686篇 |
社会与环境 | 482篇 |
灾害及防治 | 26篇 |
出版年
2023年 | 81篇 |
2022年 | 217篇 |
2021年 | 231篇 |
2020年 | 111篇 |
2019年 | 117篇 |
2018年 | 294篇 |
2017年 | 286篇 |
2016年 | 417篇 |
2015年 | 263篇 |
2014年 | 456篇 |
2013年 | 712篇 |
2012年 | 487篇 |
2011年 | 532篇 |
2010年 | 382篇 |
2009年 | 299篇 |
2008年 | 500篇 |
2007年 | 474篇 |
2006年 | 410篇 |
2005年 | 310篇 |
2004年 | 270篇 |
2003年 | 239篇 |
2002年 | 201篇 |
2001年 | 131篇 |
2000年 | 76篇 |
1999年 | 74篇 |
1998年 | 36篇 |
1997年 | 33篇 |
1996年 | 31篇 |
1995年 | 52篇 |
1994年 | 41篇 |
1993年 | 22篇 |
1992年 | 27篇 |
1991年 | 25篇 |
1990年 | 29篇 |
1989年 | 23篇 |
1988年 | 19篇 |
1986年 | 28篇 |
1985年 | 18篇 |
1982年 | 24篇 |
1966年 | 25篇 |
1965年 | 24篇 |
1964年 | 34篇 |
1962年 | 17篇 |
1961年 | 17篇 |
1959年 | 27篇 |
1958年 | 33篇 |
1957年 | 24篇 |
1956年 | 24篇 |
1955年 | 21篇 |
1954年 | 16篇 |
排序方式: 共有8515条查询结果,搜索用时 24 毫秒
951.
The Patagonian coast is considered a relatively pristine environment. However, studies conducted along coastal Patagonia have
showed hydrocarbon pollution mostly concentrated at ports that have fishing, oil loading, general merchant, and/or tourist
activities. A high value of total aliphatic hydrocarbons (TAH) was found at the Rawson fishing port (741 μg/g dw). In other
ports with and without petroleum-related activities, hydrocarbon values were approximately 100 μg/g dw. The highest values
for TAH and total aromatic hydrocarbons (TArH) were found in Faro Aristizábal, north of San Jorge gulf (1304 and 737 μg/g
dw, respectively). This is very likely the result of petroleum-related activities at the Comodoro Rivadavia, Caleta Cordova,
and Caleta Olivia ports located within this gulf. In other coastal areas away from potential anthropogenic sources, hydrocarbon
values were less than 2 and 3 μg/g dw for TAH and TArH, respectively. This review of published and unpublished information
suggests that ports are important oil pollution sources in the Patagonian coast. More detailed studies are needed to evaluate
the area affected by port activities, to understand the mechanisms of hydrocarbon distribution in surrounding environments,
and to assess bioaccumulation in marine organisms. Despite that some regulations exist to control oil pollution derived from
port and docked vessel activities, new and stricter management guidelines should be implemented. 相似文献
952.
Raymond Philippe Paul Sylvianne Perron André Bellehumeur Christian Larocque Émilie Charest Hugues 《Food and environmental virology》2022,14(1):40-58
Food and Environmental Virology - Human noroviruses are among the main causes of acute gastroenteritis worldwide. Frozen raspberries have been linked to several norovirus food-related outbreaks.... 相似文献
953.
High metal contents in edible mushrooms growing in severely contaminated industrial areas pose an important toxicological risk. In the presented study, trace element (Pb, Cd, Zn, Cu, Ag, As, Se) contents were determined in caps and stipes of three different edible mushroom species (Boletus edulis Bull. Fr., Xerocomus badius Fr. Gilb., Xerocomus chrysenteron Bull. Quél.). Additionally, information about the chemical fractionation of metals in separate soil horizons and Pb isotopic data from soils and fruiting bodies allowed a more detailed insight on the uptake mechanisms of metals by the studied mushroom species. Total metal and metalloid concentrations in the organic soil horizons reached 36234 mg Pb kg(-1); 11.9 mg Cd kg(-1); 519 mg Zn kg(-1); 488 mg Cu kg(-1); 25.1 mg Ag kg(-1); 120 mg As kg(-1) and 5.88 Se mg kg(-1). In order to evaluate the accumulation capacity of the studied species, bioconcentration factors (BCF) were calculated for separate trace elements. For selected metals (Pb, Cd, Zn, Cu), a modified BCF calculation (using EDTA-extractable concentrations of metals in soil) was proposed. High contents of Pb (up to 165 mg kg(-1)) and Cd (up to 55 mg kg(-1)) exceeded all the regulatory limits in all the studied species. This was also the case for Se (up to 57 mg kg(-1)) in B. edulis. Intensive consumption of this species grown in such polluted areas can therefore pose toxicological risks for human health. A novel finding was that X. badius can act as an Ag accumulating species when grown at polluted sites due to the high concentrations of Ag (up to 190 mg kg(-1)) in caps. Pb isotopic data showed that Pb originating from the recent air pollution control residues is present mainly in the exchangeable/acid-extractable fraction of the organic horizons and is taken up by fruiting bodies; especially in the case of B. edulis, where fast Pb accumulation occurs. Due to the high species-dependent variations of metal contents, the studied mushrooms are not suitable as bioindicators of environmental pollution. 相似文献
954.
Nicolas Lamouroux Hervé Pella Ton H. Snelder Eric Sauquet Jérome Lejot Ude Shankar 《Journal of the American Water Resources Association》2014,50(1):1-13
Spatially comprehensive estimates of the physical characteristics of river segments over large areas are required in many large‐scale analyses of river systems and for the management of multiple basins. Remote sensing and modeling are often used to estimate river characteristics over large areas, but the uncertainties associated with these estimates and their dependence on the physical characteristics of the segments and their catchments are seldom quantified. Using test data with varying degrees of independence, we derived analytical models of the uncertainty associated with estimates of upstream catchment area (CA), segment slope, and mean annual discharge for all river segments of a digital representation of the hydrographic network of France. Although there were strong relationships between our test data and estimates at the scale of France, there were also large relative local uncertainties, which varied with the physical characteristics of the segments and their catchments. Discharge and CA were relatively uncertain where discharge was low and catchments were small. Discharge uncertainty also increased in catchments with large rainfall events and low minimum temperature. The uncertainty of segment slope was strongly related to segment length. Our uncertainty models were consistent across large regions of France, suggesting some degree of generality. Their analytical formulation should facilitate their use in large‐scale ecological studies and simulation models. 相似文献
955.
Different water Acts (e.g., the European Water Framework Directive) and stakeholders involved in aquatic affairs have promoted integrated river basin management over recent decades. However, few studies have provided feedback on these policies. The aim of the current article is to fill this gap by exploring how local newspapers reflect the implementation of a broad public participation within a catchment of France known for its innovation with regard to this domain. The media coverage of a water management strategy in the Drôme watershed from 1981 to 2008 was investigated using a content analysis and a geographic information system. We sought to determine what public participation and decentralized decision-making can be in practice. The results showed that this policy was integrated because of its social perspective, the high number of involved stakeholders, the willingness to handle water issues, and the local scale suitable for participation. We emphasized the prominence of the watershed scale guaranteed by the local water authority. This area was also characterized by compromise, arrangements, and power dynamics on a fine scale. We examined the most politically engaged writings regarding water management, which topics of each group emphasized, and how the groups agreed and disagreed on issues based on their values and context. The temporal pattern of participation implementation was progressive but worked by fits and starts. 相似文献
956.
Soil pollution with antimony is of increasing environmental concern worldwide. Measures for its control and to attenuate the risks posed to the ecosystem are required. In this study the application of several iron and aluminium oxides and oxyhydroxides as soil amendments was evaluated in order to assess their feasibility to stabilize Sb in mining polluted soils. Mine soils with different pollution levels were amended with either goethite, ferrihydrite or amorphous Al oxide at various ratios (0–10%). The effectiveness of such treatments was assessed by both batch and column leaching tests. The use of ferrihydrite or amorphous Al oxide proved to be highly effective to stabilize Sb. Immobilization levels of 100% were found when doses of 5% ferrihydrite or 10% amorphous Al oxide were applied, regardless of the soil Sb load. Column leaching studies also showed a high Sb leaching reduction (>75%) when soils were amended with 1% ferrihydrite or 5% amorphous Al oxide. Moreover, such treatments proved to simultaneously immobilize As and Pb in a great extent when soils were also polluted with such toxic elements. 相似文献
957.
A. Durán J.M. Monteagudo I. San Martín M. Aguirre 《Journal of environmental management》2010,91(9):1840-1846
The aim of this work was to study the mineralization of wastewater effluent from an integrated-gasification combined-cycle (IGCC) power station sited in Spain to meet the requirements of future environmental legislation. This study was done in a pilot plant using a homogeneous photo-Fenton oxidation process with continuous addition of H2O2 and air to the system.The mineralization process was found to follow pseudo-first-order kinetics. Experimental kinetic constants were fitted using neural networks (NNs). The NNs model reproduced the experimental data to within a 90% confidence level and allowed the simulation of the process for any values of the parameters within the experimental range studied. At the optimum conditions (H2O2 flow rate = 120 mL/h, [Fe(II)] = 7.6 mg/L, pH = 3.75 and air flow rate = 1 m3/h), a 90% mineralization was achieved in 150 min.Determination of the hydrogen peroxide consumed and remaining in the water revealed that 1.2 mol of H2O2 was consumed per each mol of total organic carbon removed from solution. This result confirmed that an excess of dissolved H2O2 was needed to achieve high mineralization rates, so continuous addition of peroxide is recommended for industrial application of this process.Air flow slightly improved the mineralization rate due to the formation of peroxo-organic radicals which enhanced the oxidation process. 相似文献
958.
959.