全文获取类型
收费全文 | 10980篇 |
免费 | 1002篇 |
国内免费 | 3663篇 |
专业分类
安全科学 | 560篇 |
废物处理 | 194篇 |
环保管理 | 1905篇 |
综合类 | 8845篇 |
基础理论 | 1224篇 |
环境理论 | 6篇 |
污染及防治 | 1105篇 |
评价与监测 | 1309篇 |
社会与环境 | 428篇 |
灾害及防治 | 69篇 |
出版年
2024年 | 97篇 |
2023年 | 385篇 |
2022年 | 560篇 |
2021年 | 597篇 |
2020年 | 625篇 |
2019年 | 528篇 |
2018年 | 436篇 |
2017年 | 514篇 |
2016年 | 550篇 |
2015年 | 645篇 |
2014年 | 670篇 |
2013年 | 787篇 |
2012年 | 775篇 |
2011年 | 851篇 |
2010年 | 665篇 |
2009年 | 648篇 |
2008年 | 538篇 |
2007年 | 728篇 |
2006年 | 713篇 |
2005年 | 525篇 |
2004年 | 477篇 |
2003年 | 522篇 |
2002年 | 444篇 |
2001年 | 410篇 |
2000年 | 384篇 |
1999年 | 275篇 |
1998年 | 216篇 |
1997年 | 190篇 |
1996年 | 162篇 |
1995年 | 120篇 |
1994年 | 122篇 |
1993年 | 85篇 |
1992年 | 73篇 |
1991年 | 60篇 |
1990年 | 43篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 31篇 |
1986年 | 18篇 |
1985年 | 11篇 |
1984年 | 6篇 |
1982年 | 17篇 |
1981年 | 17篇 |
1980年 | 13篇 |
1979年 | 10篇 |
1978年 | 18篇 |
1977年 | 7篇 |
1973年 | 8篇 |
1972年 | 8篇 |
1971年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
171.
生物过滤技术在大气污染控制中的应用 总被引:6,自引:0,他引:6
周琪 《城市环境与城市生态》1998,11(1):17-21
生物过滤是控制大气污染的经济有效技术,具有较好的发展前景。本文介绍了生物过滤技术处理废气的研究,应用历史,现状,和生物过滤理论,分析了工艺的使用范围,设计及运行控制要点,列举了应用的范例。 相似文献
172.
通过亚铵法制浆蒸煮黑液直接作农肥施于水稻田的研究,给出了不同施肥方式连续数天田间水和渗滤水中黑液污染物变化情况,定量描述了黑液作肥料直接施于水稻田对水环境的影响。 相似文献
173.
Culbertson JB Valiela I Olsen YS Reddy CM 《Environmental pollution (Barking, Essex : 1987)》2008,154(2):312-319
In September 1969, the Florida barge spilled 700,000 L of No. 2 fuel oil into the salt marsh sediments of Wild Harbor, MA. Today a substantial amount, approximately 100 kg, of moderately degraded petroleum remains within the sediment and along eroding creek banks. The ribbed mussels, Geukensia demissa, which inhabit the salt marsh creek bank, are exposed to the spilled oil. Examination of short-term exposure was done with transplantation of G. demissa from a control site, Great Sippewissett marsh, into Wild Harbor. We also examined the effects of long-term exposure with transplantation of mussels from Wild Harbor into Great Sippewissett. Both the short- and long-term exposure transplants exhibited slower growth rates, shorter mean shell lengths, lower condition indices, and decreased filtration rates. The results add new knowledge about long-term consequences of spilled oil, a dimension that should be included when assessing oil-impacted areas and developing management plans designed to restore, rehabilitate, or replace impacted areas. 相似文献
174.
Field monitoring of volatile organic compounds using passive air samplers in an industrial city in Japan 总被引:4,自引:1,他引:3
Kume K Ohura T Amagai T Fusaya M 《Environmental pollution (Barking, Essex : 1987)》2008,153(3):649-657
Highly portable, sensitive, and selective passive air samplers were used to investigate ambient volatile organic compound (VOC) levels at multiple sampling sites in an industrial city, Fuji, Japan. We determined the spatial distributions of 27 species of VOCs in three campaigns: Mar (cold season), May (warm season), and Nov (mild season) of 2004. In all campaigns, toluene (geometric mean concentration, 14.0microg/m3) was the most abundant VOC, followed by acetaldehyde (4.76microg/m3), and formaldehyde (2.58microg/m3). The spatial distributions for certain VOCs showed characteristic patterns: high concentrations of benzene and formaldehyde were typically found along major roads, whereas high concentrations of toluene and tetrachloroethylene (PCE) were usually found near factories. The spatial distribution of PCE observed was extremely consistent with the diffusion pattern calculated from Pollutant Release and Transfer Register data and meteorological data, indicated that passive air samplers are useful for determining the sources and distributions of ambient VOCs. 相似文献
175.
Fernandez C Monna F Labanowski J Loubet M van Oort F 《Environmental pollution (Barking, Essex : 1987)》2008,156(3):1083-1091
The role of land use on fate of metals in soils is poorly understood. In this work, we studied the incorporation of lead in two neighboring soils with comparable pedogenesis but under long-term different agricultural management. Distributions of anthropogenic Pb were assessed from concentrations and isotopic compositions determined on bulk horizon samples, systematical 5-10 cm increment samples, and on 24-h EDTA extracts. Minor amounts of anthropogenic lead were detected until 1-m depth under permanent grassland, linked to high earthworm activity. In arable land, exogenous Pb predominantly accumulated at depths <60 cm. Although the proximity between the two sites ensured comparable exposition regarding atmospheric Pb deposition, the isotopic compositions clearly showed the influence of an unidentified component for the cultivated soil. This work highlights the need for exhaustive information on historical human activities in such anthropized agrosystems when fate of metal pollution is considered. 相似文献
176.
177.
178.
179.
In multiphase systems capillary pressures play a significant role on fluid movement and retention. The facility to predict
the effect of different thermal remediation strategies requires the knowledge of the effect of temperature on capillary pressure-saturation
relationships in the soils.
The objective of recent study was (a) to develop a technique for routinely measuring the pressure-saturation curves of soil
samples saturated with a nonpolar liquid at different regulated temperatures (b) to build a database using the measured pressure-saturation
curves and the physical, chemical properties of the model soils (c) to establish the dependence of nonaqueous phase liquid
retention on the soil properties and the temperature.
The retention curves (extraction isotherms) with nonaqueous phase liquid were determined using a modified
pressure plate extractor. The wetting phase was a non-aromatic hydrocarbon distillation product. Pressure plates were designed and constructed in
the laboratory of our department. The temperature was held constant at 20, 40 and 60 ∘C.
Statistical analysis was performed involving selected soil parameters and the measured nonaqueous phase liquid retention data.
The results show that knowing some easily measurable soil parameters (bulk density, particle size distribution, humus and
lime content) we can estimate the nonaqueous phase liquid retention of the soils. The measured “extraction isotherms” provide
essential information about the temperature-dependency of pressure-saturation curves. 相似文献
180.
环境中VOCs的污染现状及处理技术研究进展 总被引:5,自引:2,他引:5
综述了近十年来大气环境中挥发性有机物(VOcs)的污染现状及其主要处理技术的研究进展.介绍了目前大气环境中VOCs的主要处理技术(包括吸附、冷凝及膜分离等回收技术和燃烧、等离子体、光催化降解和生物降解等销毁技术)的适用条件、经济性、可操作性和净化效率.提出要对VOCs的吸收和生物降解的反应动力学模型、催化机制、材料的性能及微生物活性进行深入研究的建议. 相似文献