全文获取类型
收费全文 | 1552篇 |
免费 | 85篇 |
国内免费 | 146篇 |
专业分类
安全科学 | 132篇 |
废物处理 | 22篇 |
环保管理 | 235篇 |
综合类 | 717篇 |
基础理论 | 129篇 |
污染及防治 | 242篇 |
评价与监测 | 255篇 |
社会与环境 | 42篇 |
灾害及防治 | 9篇 |
出版年
2024年 | 3篇 |
2023年 | 36篇 |
2022年 | 28篇 |
2021年 | 51篇 |
2020年 | 45篇 |
2019年 | 37篇 |
2018年 | 31篇 |
2017年 | 48篇 |
2016年 | 59篇 |
2015年 | 59篇 |
2014年 | 69篇 |
2013年 | 78篇 |
2012年 | 88篇 |
2011年 | 86篇 |
2010年 | 60篇 |
2009年 | 122篇 |
2008年 | 104篇 |
2007年 | 110篇 |
2006年 | 88篇 |
2005年 | 70篇 |
2004年 | 48篇 |
2003年 | 44篇 |
2002年 | 71篇 |
2001年 | 54篇 |
2000年 | 53篇 |
1999年 | 48篇 |
1998年 | 35篇 |
1997年 | 38篇 |
1996年 | 26篇 |
1995年 | 20篇 |
1994年 | 18篇 |
1993年 | 12篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1978年 | 1篇 |
1977年 | 4篇 |
1976年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1783条查询结果,搜索用时 750 毫秒
991.
For the purpose of understanding the transport and deposition mechanisms and the air–water distribution of some volatile chlorinated hydrocarbons (VCHCs), their atmosphere/aquatic environment concentration ratio was evaluated. In addition, for the purpose of differentiating VCHC behaviour in a temperate climate from its behaviour in a polar climate, the atmosphere/aquatic environment concentration ratio evaluated in matrices from temperate zones was compared with the concentration ratio evaluated in Antarctic matrices.In order to perform air samplings also at rigid Antarctic temperatures, the sampling apparatus, consisting of a diaphragm pump and canisters, was suitably modified.Chloroform, 1,1,1-trichloroethane, tetrachloromethane, 1,1,2-trichloroethylene and tetrachloroethylene were measured in air, water and snow using specific techniques composed of a purpose-made cryofocusing-trap-injector (for air samples) and a modified purge-and-trap injector (for aqueous samples) coupled to a gas chromatograph with mass spectrometric detection operating in selected ion monitoring mode. The VCHCs were retrieved in all the investigated matrices, both Italian and Antarctic, with concentrations varying from tens to thousands of ng m−3 in air and from digits to hundreds of ng kg−1 in water and snow.The atmosphere/aquatic environment concentration ratios were always found to be lower than 1. In particular, the Italian air/water concentration ratios were smaller than the Antarctic ones, by reason of the higher atmospheric photochemical activity in temperate zones. On the other hand, the Antarctic air/snow concentration ratios proved to be largely in favour of snow with respect to the Italian ratios, thus corroborating the hypothesis of a more efficient VCHC deposition mechanism and accumulation on Antarctic snow. 相似文献
992.
Li A Rockne KJ Sturchio N Song W Ford JC Wei H 《Environmental pollution (Barking, Essex : 1987)》2009,157(1):141-147
A region-wide data analysis on polychlorinated biphenyls (PCBs) in the sediment of the Great Lakes reveals a total accumulation of approximately 300 ± 50 tonnes, representing a >30% reduction from the 1980s. Evidence of in situ degradation of sediment PCB was found, with estimated t1/2 of 11 and 17 years, at two open water locations in Lake Ontario. The relative abundance of heavy homologs as well as para-chlorines decreases with increasing depth, while the opposite is true for medium and light homologs and ortho-chlorines. In Lake Michigan, the vertical pattern features enrichment of heavier congeners and reduction of ortho-chlorines in deeper sediment layers, opposite to the trend in Lake Ontario. PCBs decrease log-linearly with increasing latitude and longitude. Air deposition of PCBs to lake sediment decreases at about 0.077 ng cm−2 yr−1 per degree latitude (N) for the geographic region extending from the Great Lakes to within the Arctic Circle. 相似文献
993.
Abhishek Tiwary Christopher Peachey Sotiris Vardoulakis Giovanni Leonardi Adisa Azapagic 《Environmental pollution (Barking, Essex : 1987)》2009,157(10):2645-2653
The role of vegetation in mitigating the effects of PM10 pollution has been highlighted as one potential benefit of urban greenspace. An integrated modelling approach is presented which utilises air dispersion (ADMS-Urban) and particulate interception (UFORE) to predict the PM10 concentrations both before and after greenspace establishment, using a 10 × 10 km area of East London Green Grid (ELGG) as a case study. The corresponding health benefits, in terms of premature mortality and respiratory hospital admissions, as a result of the reduced exposure of the local population are also modelled. PM10 capture from the scenario comprising 75% grassland, 20% sycamore maple (Acer pseudoplatanus L.) and 5% Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) was estimated to be 90.41 t yr−1, equating to 0.009 t ha−1 yr−1 over the whole study area. The human health modelling estimated that 2 deaths and 2 hospital admissions would be averted per year. 相似文献
994.
Air pollutant emissions from rice straw open field burning in India, Thailand and the Philippines 总被引:4,自引:0,他引:4
Butchaiah Gadde Sébastien Bonnet Christoph Menke Savitri Garivait 《Environmental pollution (Barking, Essex : 1987)》2009,157(5):1554-1558
Rice is a widely grown crop in Asia. China (30%) and India (21%) contribute to about half of the world's total rice production. In this study, three major rice-producing countries in Asia are considered, India, Thailand and the Philippines (the later two contributing 4% and 2% of the world's rice production). Rice straw is one of the main field based residues produced along with this commodity and its applications vary widely in the region. Although rice production practises vary from one country to another, open burning of straw is a common practice in these countries.In this study, an approach was followed aiming at (a) determining the quantity of rice straw being subject to open field burning in those countries, (b) congregating pollutant specific emissions factors for rice straw burning, and (c) quantifying the resulting air pollutant emissions. Uncertainties in the results obtained as compared to a global approach are also discussed. 相似文献
995.
Thomas Klein Jaakko Kukkonen ?sl?g Dahl Elissavet Bossioli Alexander Baklanov Aasmund Fahre Vik Paul Agnew Kostas D. Karatzas Mikhail Sofiev 《Ambio》2012,41(8):851-864
This article reviews interactions and health impacts of physical, chemical, and biological weather. Interactions and synergistic effects between the three types of weather call for integrated assessment, forecasting, and communication of air quality. Today’s air quality legislation falls short of addressing air quality degradation by biological weather, despite increasing evidence for the feasibility of both mitigation and adaptation policy options. In comparison with the existing capabilities for physical and chemical weather, the monitoring of biological weather is lacking stable operational agreements and resources. Furthermore, integrated effects of physical, chemical, and biological weather suggest a critical review of air quality management practices. Additional research is required to improve the coupled modeling of physical, chemical, and biological weather as well as the assessment and communication of integrated air quality. Findings from several recent COST Actions underline the importance of an increased dialog between scientists from the fields of meteorology, air quality, aerobiology, health, and policy makers. 相似文献
996.
Chronic risk assessment of exposure to volatile organic compounds in the atmosphere near the largest Mediterranean industrial site 总被引:3,自引:0,他引:3
This study focuses on characterising the risk of exposure to volatile organic compounds (VOCs) by means of inhalation in people living in the vicinity of the largest chemical production site in the Mediterranean area. Eighty-six VOCs were initially selected for this study based on their adverse environmental and health effects. The monitoring campaign was conducted for 276 days in three different locations around the chemical site. The analytical method used for the characterisation was based on European standard method EN-14662-2, which consists of the active sampling of air for 24 h in charcoal tubes, followed by extraction with carbon disulphide and GC-MS analysis. Forty-four VOCs with toxicological data available concerning their carcinogenic and non-carcinogenic health effects were quantified during the monitoring campaign. None of the quantified VOCs showed average concentrations exceeding their chronic reference concentrations and, therefore, no non-carcinogenic health effects are expected as a result of this exposure. However, the global average cancer risk due to VOC exposure in the area (3.3 × 10− 4) was found to be above the values recommended by the WHO and USEPA.The influence of the analytical method was also evaluated by comparing cancer risk estimates using a thermal desorption (TD) method based on method EN-14662-1. The results of the 24-h samples for the solvent extraction method were compared with the average of 12 daily samples of 2-h for the TD method for 24 sampling days. Although the global estimated lifetime cancer risk was statistically comparable for both methods, some differences were found in individual VOC risks.To our knowledge, this is the first study that estimates the carcinogenic and non-carcinogenic risks posed by the inhalation of VOCs in people living near a chemical site of this size, and compares the estimated cancer risk obtained using two different standard analytical methods. 相似文献
997.
998.
我国渔港经济区发展现状、问题及对策探讨 总被引:1,自引:0,他引:1
发展渔港经济区对调整渔业产业结构,促进渔业增效和渔民增收,激活渔区经济,加快海洋经济步伐,全面建设小康社会具有重要的意义。对我国渔港经济区的发展现状、特点进行了梳理,在分析目前存在问题的基础上,提出了建设渔港经济区的相关建议,以期对相关决策部门制定战略提供有益参考。 相似文献
999.
1000.