全文获取类型
收费全文 | 511篇 |
免费 | 7篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 25篇 |
环保管理 | 50篇 |
综合类 | 68篇 |
基础理论 | 114篇 |
污染及防治 | 166篇 |
评价与监测 | 59篇 |
社会与环境 | 23篇 |
出版年
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 19篇 |
2020年 | 4篇 |
2019年 | 9篇 |
2018年 | 16篇 |
2017年 | 25篇 |
2016年 | 25篇 |
2015年 | 14篇 |
2014年 | 17篇 |
2013年 | 43篇 |
2012年 | 30篇 |
2011年 | 39篇 |
2010年 | 27篇 |
2009年 | 25篇 |
2008年 | 33篇 |
2007年 | 25篇 |
2006年 | 25篇 |
2005年 | 14篇 |
2004年 | 25篇 |
2003年 | 10篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1964年 | 5篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 3篇 |
1958年 | 1篇 |
1953年 | 1篇 |
1951年 | 1篇 |
1929年 | 1篇 |
1920年 | 2篇 |
排序方式: 共有519条查询结果,搜索用时 93 毫秒
401.
A. Campos-Ramos A. Aragón-Piña I. Galindo-Estrada Xavier Querol Andrés Alastuey 《Atmospheric environment (Oxford, England : 1994)》2009,43(39):6159-6167
Samples of particulate matter were collected during the period from October 2006 through September 2007 in a rural station located 12 km from the city of Colima. A total of 3600 particles were analyzed by SEM-EDS and then classified by their chemical composition and morphology in order of abundance: those rich in C, Fe, Si–Al, Cl–Na, Ca, Ba; and to a lesser abundance, particles rich in heavy metals such as Pb and V–Ni were observed. A factorial analysis was carried out to determine the main elements related with the emission sources such as crustal/farming; fuel-oil; marine; volcanic activity and industry. Trough the seasons, the dominant winds causes the presence of anthropogenic particles in the rural site. The information presented in this study aims to give insight and detailed of the analysis of the morphological characteristics and chemical composition of atmospheric particles at individual level in a rural site from Colima State, Mexico. 相似文献
402.
Wooden guardrails are usually built and installed on construction sites to protect workers against falls. In this context, it is extremely difficult to verify whether they are safe and comply with existing regulations. The present study describes the development and validation of an evaluation method and a test protocol for verifying whether these wooden guardrails are safe and meet the requirements of the Québec Safety Code for the construction industry (S-2.1, r.6) in order to ensure that workers have adequate fall protection. This study shows that some wooden guardrails do not comply with S-2.1, r.6. The evaluation method and test protocol are reproducible and easily applicable on construction sites and can easily be adapted to international regulations. 相似文献
403.
Kovács A Demeter I Fatér I Bagyura J Nagy K Szitta T Firmánszky G Horváth M 《Ambio》2008,37(6):457-459
The globally threatened Eastern Imperial Eagle Aquila heliaca has been one of the flagship species of Hungarian bird conservation efforts since the 1980s. Due to these conservation activities and positive land-use changes during the last 2 decades, the Hungarian Imperial Eagle population increased from as few as approximately 20 pairs in the early 1980s to 81 pairs by 2006. Between 2002 and 2005 as part of a LIFE-Nature project, MME/Birdlife Hungary carried out particularly intensive monitoring, conservation, research, and public awareness actions. The main goal of the project was to secure the long-term sustainable increase in the Imperial Eagle population after Hungary's European Union accession in 2004. New methods were developed and applied to census and monitor the breeding and wintering population sizes. Standardized baseline land-use mapping and surveys were introduced to detect long-term land-use and prey density changes in priority areas for Imperial Eagles and to monitor the effects of key mortality factors, such as electrocution. Historical information and data gathered before and during the project period were assimilated using a Geographic Information System and incorporated into a comprehensive set of Imperial Eagle Management Guidelines. 相似文献
404.
Massad RS Loubet B Tuzet A Cellier P 《Environmental pollution (Barking, Essex : 1987)》2008,154(3):390-403
The ammonia stomatal compensation point of plants is determined by leaf temperature, ammonium concentration ([NH4+]apo) and pH of the apoplastic solution. The later two depend on the adjacent cells metabolism and on leaf inputs and outputs through the xylem and phloem. Until now only empirical models have been designed to model the ammonia stomatal compensation point, except the model of Riedo et al. (2002. Coupling soil-plant-atmosphere exchange of ammonia with ecosystem functioning in grasslands. Ecological Modelling 158, 83-110), which represents the exchanges between the plant's nitrogen pools. The first step to model the ammonia stomatal compensation point is to adequately model [NH4+]apo. This [NH4+]apo has been studied experimentally, but there are currently no process-based quantitative models describing its relation to plant metabolism and environmental conditions. This study summarizes the processes involved in determining the ammonia stomatal compensation point at the leaf scale and qualitatively evaluates the ability of existing whole plant N and C models to include a model for [NH4+]apo. 相似文献
405.
Van Damme PA Hamel C Ayala A Bervoets L 《Environmental pollution (Barking, Essex : 1987)》2008,156(3):1061-1068
Several High Andes Rivers are characterized by inorganic water pollution known as acid mine drainage (AMD). The aim of this study was to assess the relationship between metal concentrations in the sediments and the macroinvertebrate communities in two river basins affected by AMD. In general, the taxon diversity of the macroinvertebrate community at the family level was low. The concentrations of Cd, Cu, Zn, Pb and Ni at mining sites were higher than at unpolluted sites. The pH of the water was alkaline (7.0-8.5) in unpolluted sites, whereas it dropped to very low values (<3) at mining sites. Redundancy Analysis (RDA) showed that pH was the best predictor of macroinvertebrate community richness. The number of macroinvertebrate families decreased gradually with increasing acidity, both in pools and riffles, though it is suggested that riffle communities were more affected because they are in closer contact with the acid water. 相似文献
406.
M.M. Andréa R.Y. Tomita L.C. Luchini M.R. Musumeci 《Journal of environmental science and health. Part. B》2013,48(1):133-139
Abstract In support of field data, laboratory studies were conducted on volatilization, mineralization and binding of 14C‐p,p'‐DDT in soils at Sao Paulo. Incubation of soil for 6 weeks did not result in volatilized organics or mineralization; with >95% extractable radiocarbon in the form of p,p'‐DDT. Small amounts of bound residues (1.8%) were detected in soil. These data confirm the very slow dissipation of DDT in the field which presumably relates to the acidic pH of soil (4.5–4.8). Bound 14C‐residues in soils treated with 14C‐p,p'‐DDT at Praia Grande and Sao Paulo could be released (5–21%) by sulphuric acid treatment. The released residue had the composition: 69–90% DDT, 7–32% DDD and 0–3% DDE. Incubation of soil bound 14C‐residues with fresh inoculum for 3 months did not result in release of 14C. Dissipation from wooden surfaces was fairly slow. After 20 weeks, 74% of the applied radioactivity could be recovered; 44% hexane‐non‐extractable. 相似文献
407.
Åke Sjödin David A. Cooper Kenth Andréasson 《Journal of the Air & Waste Management Association (1995)》2013,63(3):186-190
Abstract Ambient air measurements of N2O, NOx, CO, and HC based on grab sampling were conducted in a major traffic tunnel in Sweden, that carries up to 4,000 vehicles per hour, in order to estimate real-world emissions of N2O for road traffic. Two different methods—relative and mass balance—were used to calculate a N2O emission factor for the mixed vehicle fleet, which gave an average emission factor, at average speeds of 30-70 km/h, of approximately 25 mg N2O/ km, with a range of 7-56 mg/km. 相似文献
408.
Thomas Plocoste Jean-François Dorville Stéphanie Monjoly Sandra Jacoby-Koaly Maïna André 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1278-1300
ABSTRACTThis paper presents a study on ground-level ozone (O3), nitrogen oxides (NOx = NO + NO2) concentrations, and their variabilities in the ambient air of three sites of a tropical archipelago that is moderately urbanized. Statistical analysis was performed on a quite complete (>80%) set of 5 years of measurements (2008–2012). There are few studies on those pollutants and their seasonal behavior in the Caribbean area, where pollution level and cities configuration are different from megacities. Analyses are focused on pollutant variations at the scale of the day, the week, and the seasons, using hourly data. The observations show that NOx concentrations are more elevated during the wet season, whereas O3 concentrations are higher in the dry season. Amplitudes of ozone cycles are strongly influenced by meteorological conditions (temperature, global radiation, and wind speed) and prevailing levels of NOx. An ozone weekend effect is detected with the highest amplitude in the city, where anthropogenic activity is the lowest during the weekend. Due to the nature and the origin of pollutants, NOx shows higher variability than O3 in the time series. Our results evince the need for continuous measurements of volatile organic compounds (VOCs) in order to better quantify their contribution in O3 formation in an insular context where numerous natural sources have been identified.Implications: Statistical analyses of observed NOx and O3 concentrations for 5 years for a typical low industrialized site of the Caribbean area have been done. Air quality for those components is correct based on the standards of the World Health Orgaization, pollutant source spatial distributions, and level of industrialization. Observations show the same patterns as in megacities but also a strong impact of weather conditions and road traffic. Behaviors of O3 cannot be fully explained without VOCs monitoring. Localization and type of AQS should be reconsidered to improve the accuracy of concentrations of the pollutant and better understand their behaviors. 相似文献
409.
410.
Christiane A. D. Melo André M. Massenssini Ana Beatriz R. J. Passos Felipe P. Carvalho Lino R. Ferreira Antonio Alberto Silva 《Journal of environmental science and health. Part. B》2017,52(2):115-121
This study aimed to isolate and characterize bacteria able to use sulfentrazone in the commercial formulation as their sole carbon source. The isolation of the potential sulfentrazone-degrading bacteria was made from soil samples with a recent history of herbicide application and from isolates identified through rDNA sequencing. Subsequently, we assessed the growth of the isolates and their sulfentrazone degradation ability using high-performance liquid chromatography. Twenty-six potential sulfentrazone-degrading bacterial isolates were obtained in pure culture. Through analysis of the rDNA sequences, the predominance of bacterial species of the genus Pseudomonas was found. The isolates presented a differentiated ability of sulfentrazone degradation. The presence of herbicide in the culture medium reduced the log phase of four isolates. Pseudomonas putida, Pseudomonas lutea, Pseudomonas plecoglossicida and three isolates of Pseudomonas sp. showed higher sulfentrazone degradation capacity, which varied from 4 to 15%. This is the first report of the Pseudomonas genre capable of sulfentrazone degradation. The isolates obtained present potential use in bioremediation programs for soil contaminated with sulfentrazone. 相似文献