全文获取类型
收费全文 | 3611篇 |
免费 | 98篇 |
国内免费 | 249篇 |
专业分类
安全科学 | 221篇 |
废物处理 | 22篇 |
环保管理 | 815篇 |
综合类 | 1475篇 |
基础理论 | 289篇 |
污染及防治 | 367篇 |
评价与监测 | 594篇 |
社会与环境 | 120篇 |
灾害及防治 | 55篇 |
出版年
2024年 | 4篇 |
2023年 | 48篇 |
2022年 | 50篇 |
2021年 | 79篇 |
2020年 | 105篇 |
2019年 | 54篇 |
2018年 | 63篇 |
2017年 | 95篇 |
2016年 | 120篇 |
2015年 | 133篇 |
2014年 | 165篇 |
2013年 | 188篇 |
2012年 | 162篇 |
2011年 | 260篇 |
2010年 | 122篇 |
2009年 | 265篇 |
2008年 | 237篇 |
2007年 | 232篇 |
2006年 | 175篇 |
2005年 | 149篇 |
2004年 | 131篇 |
2003年 | 126篇 |
2002年 | 107篇 |
2001年 | 101篇 |
2000年 | 99篇 |
1999年 | 104篇 |
1998年 | 100篇 |
1997年 | 65篇 |
1996年 | 55篇 |
1995年 | 65篇 |
1994年 | 73篇 |
1993年 | 53篇 |
1992年 | 28篇 |
1991年 | 26篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 12篇 |
1987年 | 7篇 |
1986年 | 12篇 |
1985年 | 8篇 |
1984年 | 7篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 7篇 |
1974年 | 2篇 |
1973年 | 5篇 |
1969年 | 2篇 |
1968年 | 2篇 |
排序方式: 共有3958条查询结果,搜索用时 23 毫秒
21.
工业纤维废渣利用的生物技术研究 总被引:3,自引:0,他引:3
用平板分离法从树皮中选育出“5088号菌种”,使麻纺厂的废弃下脚料转化成可替代饲料中玉米成份的“媲谷菌饲”。并利用造纸厂白泥,粘胶纤维厂废水处理产生的污泥作饲料钙,锌元素添加剂获成功。 相似文献
22.
介绍了沈阳市地下水水源地分布状况、浑河沿岸水文地质条件与河水的渗漏、浑河污染对地下水源的影响及2 0 0 2~ 2 0 0 3年浑河治臭工程对地下水环境的影响 相似文献
23.
隶属度法和试行评价法对柳杨河两个断面及整个河段进行了分析和评价,结果表明,隶属度法不但可以确定某项污染物是污染等级,还能计算出超标倍数,对试行分析法进行了补充和订正,使得分析结果更加准确。同时分析了断面和水体污染原因,为环境管理提供技术支持和依据。 相似文献
24.
江苏省太湖污染防治概述 总被引:6,自引:0,他引:6
太湖水源是整个太湖流域国民经济与社会发展的命脉,近年来太湖水质恶化已影响太湖流域的经济与社会发展,分析了太湖污染来源及污染状况探讨了太湖污染的发展原因,指出了太湖水污染防治的措施,如污染物总量控制,重点治理,综合防治等。 相似文献
25.
26.
An overview of the methods used in the characterisation of natural organic matter (NOM) in relation to drinking water treatment 总被引:9,自引:0,他引:9
Matilainen A Gjessing ET Lahtinen T Hed L Bhatnagar A Sillanpää M 《Chemosphere》2011,83(11):1431-1442
Natural organic matter (NOM) is found in all surface, ground and soil waters. During recent decades, reports worldwide show a continuing increase in the color and NOM of the surface water, which has an adverse affect on drinking water purification. For several practical and hygienic reasons, the presence of NOM is undesirable in drinking water. Various technologies have been proposed for NOM removal with varying degrees of success. The properties and amount of NOM, however, can significantly affect the process efficiency. In order to improve and optimise these processes, the characterisation and quantification of NOM at different purification and treatment processes stages is important. It is also important to be able to understand and predict the reactivity of NOM or its fractions in different steps of the treatment. Methods used in the characterisation of NOM include resin adsorption, size exclusion chromatography (SEC), nuclear magnetic resonance (NMR) spectroscopy, and fluorescence spectroscopy. The amount of NOM in water has been predicted with parameters including UV-Vis, total organic carbon (TOC), and specific UV-absorbance (SUVA). Recently, methods by which NOM structures can be more precisely determined have been developed; pyrolysis gas chromatography-mass spectrometry (Py-GC-MS), multidimensional NMR techniques, and Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS). The present review focuses on the methods used for characterisation and quantification of NOM in relation to drinking water treatment. 相似文献
27.
Izaskun Zorita Joana Larreta Natalia Montero José Germán Rodríguez Javier Franco Ángel Borja 《Chemistry and Ecology》2013,29(5):432-445
Bioaccumulation and biological effects of pollution were assessed in mussels (Mytilus galloprovincialis) caged for one month at three sites in the Oiartzun estuary (south-eastern Bay of Biscay, Spain) with the aim of evaluating their usefulness within the investigative monitoring defined in the European Union Water Framework Directive (WFD). The highest concentrations of organic contaminants determined in mussels' tissue were detected towards the inner part of the estuary but no gradient pattern was found for metal bioaccumulation. Population fitness responses measured as condition index, stress on stress and gonad index were similar in all caged mussels and did not follow the organic pollution gradient. However, biomarkers determined at tissue, cell and protein level (histopathology, micronuclei frequency, malondialdehyde levels and vitellogenin-like protein levels) revealed a higher stress syndrome at the inner part of the estuary showing signs of genotoxicity, oxidative stress and endocrine disruption. Overall, the integrated chemical–biological approach in connection with mussel caging technique proved to be a useful tool to assess environmental pollution, allowing a better understanding of the cause–effect relationship within the investigative monitoring defined in the WFD. 相似文献
28.
Adsorption of pesticides ametryn, aldicarb, dinoseb and diuron from aqueous solution onto high specific area activated carbon-cloth was studied. Kinetics of adsorption was followed by in situ UV-spectroscopy and the data were treated according to various rate models. The extent of adsorption was determined at the end of 125 min adsorption period. Rate constants and the extent of adsorption for the four pesticides were found to follow the order: dinoseb > ametryn > diuron > aldicarb. Adsorption isotherms were derived at 25 °C on the basis of batch analysis. Isotherm data were treated according to Langmuir and Freundlich models. The fits of experimental data to these equations were examined. The types of interactions between the surface and pesticide molecules were discussed. 相似文献
29.
Takeshi Sasaki Atsushi Iizuka Masayuki Watanabe Teruhisa Hongo Akihiro Yamasaki 《Waste management (New York, N.Y.)》2014,34(10):1829-1835
Solid adsorbent materials, prepared from waste cement powder and concrete sludge were assessed for removal of arsenic in the form of arsenic (As(V)) from water. All the materials exhibited arsenic removal capacity when added to distilled water containing 10–700 mg/L arsenic. The arsenic removal isotherms were expressed by the Langmuir type equations, and the highest removal capacity was observed for the adsorbent prepared from concrete sludge with heat treatment at 105 °C, the maximum removal capacity being 175 mg-As(V)/g. Based on changes in arsenic and calcium ion concentrations, and solution pH, the removal mechanism for arsenic was considered to involve the precipitation of calcium arsenate, Ca3(AsO4)2. The enhanced removal of arsenic for the adsorbent prepared from concrete sludge with heat treatment was thought to reflect ion exchange by ettringite. The prepared adsorbents, derived from waste cement and concrete using simple procedures, may offer a cost effective approach for arsenic removal and clean-up of contaminated waters, especially in developing countries. 相似文献
30.
Critical review of Integrated Water Resources Management: Moving beyond polarised discourse 总被引:1,自引:0,他引:1
Integrated Water Resource Management (IWRM) emerged as a popular concept in the water sector in the 20th century. From a highly techno-centric approach in the past, it has taken a new turn embracing Habermasian communicative rationality as a place-based nexus for multiple actors to consensually and communicatively integrate decisions in a hydrological unit. The 'how to integrate' approach had remarkable appeal worldwide in promoting authentic participation of all stakeholders. However, critics argue that the domain of water resource management is a political process of contestation and negotiation; the emphasis is on complexities, contextuality, power dynamics and the importance of analysing real world situations. They demonstrate 'how integration cannot be achieved' given the power dynamics in social interactions. These apparently contradictory discourses draw on different theoretical paradigms and polarise the discourse on IWRM, without offering constructive alternatives. To this end, this paper offers an option to complement this polarised discourse by examining 'how integration actually does take place' in a strategic context thereby facilitating consensual decisions to integrate water management for a sustainable future. 相似文献