全文获取类型
收费全文 | 4962篇 |
免费 | 209篇 |
国内免费 | 461篇 |
专业分类
安全科学 | 321篇 |
废物处理 | 37篇 |
环保管理 | 1125篇 |
综合类 | 2086篇 |
基础理论 | 510篇 |
环境理论 | 3篇 |
污染及防治 | 424篇 |
评价与监测 | 662篇 |
社会与环境 | 311篇 |
灾害及防治 | 153篇 |
出版年
2024年 | 6篇 |
2023年 | 73篇 |
2022年 | 96篇 |
2021年 | 122篇 |
2020年 | 165篇 |
2019年 | 104篇 |
2018年 | 98篇 |
2017年 | 163篇 |
2016年 | 196篇 |
2015年 | 189篇 |
2014年 | 221篇 |
2013年 | 283篇 |
2012年 | 251篇 |
2011年 | 387篇 |
2010年 | 177篇 |
2009年 | 360篇 |
2008年 | 272篇 |
2007年 | 307篇 |
2006年 | 240篇 |
2005年 | 203篇 |
2004年 | 211篇 |
2003年 | 178篇 |
2002年 | 156篇 |
2001年 | 138篇 |
2000年 | 130篇 |
1999年 | 120篇 |
1998年 | 118篇 |
1997年 | 86篇 |
1996年 | 71篇 |
1995年 | 73篇 |
1994年 | 79篇 |
1993年 | 58篇 |
1992年 | 38篇 |
1991年 | 24篇 |
1990年 | 25篇 |
1989年 | 12篇 |
1988年 | 16篇 |
1987年 | 12篇 |
1986年 | 14篇 |
1985年 | 43篇 |
1984年 | 22篇 |
1983年 | 15篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 14篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1973年 | 5篇 |
1971年 | 5篇 |
1968年 | 2篇 |
排序方式: 共有5632条查询结果,搜索用时 125 毫秒
991.
Biosensors for sensitive and specific detection of foodborne and waterborne pathogens are particularly valued for their portability, usability, relatively low cost, and real-time or near real-time response. Their application is widespread in several domains, including environmental monitoring. The main limitation of currently developed biosensors is a lack of sensitivity and specificity in complex matrices. Due to increased interest in biosensor development, we conducted a systematic review, com... 相似文献
992.
Xuemin Hao Guanlong Wang Shuo Chen Hongtao Yu Xie Quan 《Frontiers of Environmental Science & Engineering》2019,13(5):77
993.
生活垃圾填埋场封场后种植植物中重金属迁移研究 总被引:3,自引:1,他引:3
在上海老港生活垃圾填埋场填埋单元封场的覆盖土中掺混了矿化垃圾种植植物,分析Cd、Pb、Cu、Zn 4种重金属在土壤和植物中的迁移变化,研究表明:(1)覆盖土土质从一般耕作土变成肥沃土壤;覆盖土和种植混合土重金属Cd、Pb、Cu、Zn中Cd、Pb含量相近,但种植土的Cu含量略大于覆盖原土,Zn含量远大于覆盖原土;(2)植物能富集土壤和垃圾中的重金属,木本植物的根部富集重金属的能力强于草本植物,但重金属在草本植物根、茎、叶中的迁移速度大于木本植物;(3)植物根、茎、叶的Cu、Zn含量均远大于未受污染土壤种植植物相应部位的Cu、Zn含量,种植的植物不能供家养动物食用,以免通过食物链作用危及人体安全. 相似文献
994.
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (DL-PCBs) were measured in ambient air samples collected from different parts of South Korea in 2008, and the measured levels were used for assessing the spatial and temporal distribution of atmospheric PCDDFs and DL-PCBs in South Korea. The average concentrations of atmospheric PCDD/Fs and DL-PCBs among the 37 sites were 28 fg I-TEQ m−3 (ND ∼ 617) and 1 fg WHO-TEQ m−3 (ND ∼ 0.016). Elevated atmospheric levels of PCDD/Fs and DL-PCBs observed at residential/industrial sites and in the north-west of Korea, indicated a potential contribution and impacts of anthropogenic sources of PCDD/Fs and DL-PCBs. These levels were similar or lower than those previously reported in other ambient air surveys. Average concentrations of PCDD/Fs showed small seasonal variations (ANOVA analysis, p = 0.144). The highest concentrations of PCDD/Fs were observed during winter, followed by spring, autumn and summer. Atmospheric PCDD/Fs and DL-PCBs in South Korea rapidly decreased during the last 10 years (1998-2008), demonstrating the efficiency of stricter regulations and the application of best available technologies/best environmental practices at emission sources. Comparison of the congener profiles and principal component analysis showed that current atmospheric PCDD/Fs are mostly influenced by industrial sources and PCBs from old commercial PCB uses. Nationwide POPs monitoring will continue and allows an effective evaluation of the implementation of the Stockholm Convention on POPs. 相似文献
995.
996.
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
997.
深圳市东部引水工程,是一项缓解深圳市水资源短缺、促进经济稳定发展、重要跨流域调水工程。工程的管理必须考虑水量、水质、社会经济等多方面的因素,基于水量,水质统一管理的可靠性计算,对工程的可持续发展决策与管理是必需的和有实际意义的,分析传统水资源系统可靠性准则的不足之处,结合工程实际,提出了基于水量、水质统一的水资源系统多准则可靠性评价准则,通过可靠性分析,为深圳东部引水水源工程提供了科学合理的运行管 相似文献
998.
999.
1000.
采用粉煤灰合成沸石的方法既经济又环保,在乙酸乙酯吸附领域中具有巨大应用前景.遵循节能减排、废物再利用的环保原则,探索了3种不同Si/Al比的粉煤灰、结晶温度、结晶时间和碱浓度4个因素对合成NaY沸石的影响.XRD、氮气吸脱附实验及ICP结果表明,Si/Al比和水热结晶温度对高比表面积NaY沸石的合成影响最大.Si/Al比在1左右的粉煤灰合成的沸石比表面积较低,且晶形中存在大量的NaA沸石,而Si/Al比在2左右的粉煤灰合成了高比表面积且纯度较高的NaY沸石;3种粉煤灰均在65 ℃下合成NaY沸石,但在105 ℃下完全转化为方钠石.实验优化结果表明,最优合成条件为采用Si/Al为2左右的粉煤灰,在2 mol·L-1碱浓度、65 ℃水热温度下结晶12 h.该条件下合成的NaY沸石比表面积高达654.86 m2·g-1(比表面积最高的粉煤灰源沸石之一),是原粉煤灰比表面积的22倍左右,对乙酸乙酯的吸附量也由15.4 mg·g-1增至108.2 mg·g-1. 相似文献