全文获取类型
收费全文 | 27414篇 |
免费 | 217篇 |
国内免费 | 140篇 |
专业分类
安全科学 | 508篇 |
废物处理 | 1521篇 |
环保管理 | 3518篇 |
综合类 | 4782篇 |
基础理论 | 7080篇 |
环境理论 | 10篇 |
污染及防治 | 6162篇 |
评价与监测 | 2147篇 |
社会与环境 | 1962篇 |
灾害及防治 | 81篇 |
出版年
2022年 | 127篇 |
2021年 | 150篇 |
2019年 | 130篇 |
2018年 | 1668篇 |
2017年 | 1561篇 |
2016年 | 1509篇 |
2015年 | 418篇 |
2014年 | 430篇 |
2013年 | 1308篇 |
2012年 | 939篇 |
2011年 | 2015篇 |
2010年 | 1230篇 |
2009年 | 1216篇 |
2008年 | 1584篇 |
2007年 | 1957篇 |
2006年 | 723篇 |
2005年 | 613篇 |
2004年 | 637篇 |
2003年 | 684篇 |
2002年 | 647篇 |
2001年 | 685篇 |
2000年 | 454篇 |
1999年 | 333篇 |
1998年 | 233篇 |
1997年 | 235篇 |
1996年 | 253篇 |
1995年 | 258篇 |
1994年 | 266篇 |
1993年 | 245篇 |
1992年 | 217篇 |
1991年 | 227篇 |
1990年 | 209篇 |
1989年 | 182篇 |
1988年 | 184篇 |
1987年 | 172篇 |
1986年 | 164篇 |
1985年 | 167篇 |
1984年 | 193篇 |
1983年 | 191篇 |
1982年 | 187篇 |
1981年 | 169篇 |
1980年 | 142篇 |
1979年 | 135篇 |
1978年 | 140篇 |
1977年 | 122篇 |
1976年 | 105篇 |
1975年 | 110篇 |
1974年 | 122篇 |
1971年 | 104篇 |
1967年 | 103篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
851.
An efficient technology to treat heavy metal--lead--contaminated soil by microwave radiation 总被引:1,自引:0,他引:1
Jou CJ 《Journal of environmental management》2006,78(1):1-4
Microwave (MW) technology can be used to vitrify contaminated soil wastes and immobilize heavy metal ions in soils. More than 93% of the Pb(II)-contaminated soil was vitrified to a glass/ceramic formation after 30 min of MW radiation. In a 6-year study, the Pb(II) concentration of the vitrified soil in the leaching test was less than 1.0 mg/l, which is substantially below the USEPA regulatory limit of 5.0 mg/l. 相似文献
852.
853.
Decommissioning of offshore oil and gas facilities: a comparative assessment of different scenarios 总被引:1,自引:0,他引:1
A material and energy flow analysis, with corresponding financial flows, was carried out for different decommissioning scenarios for the different elements of an offshore oil and gas structure. A comparative assessment was made of the non-financial (especially environmental) outcomes of the different scenarios, with the reference scenario being to leave all structures in situ, while other scenarios envisaged leaving them on the seabed or removing them to shore for recycling and disposal. The costs of each scenario, when compared with the reference scenario, give an implicit valuation of the non-financial outcomes (e.g. environmental improvements), should that scenario be adopted by society. The paper concludes that it is not clear that the removal of the topsides and jackets of large steel structures to shore, as currently required by regulations, is environmentally justified; that concrete structures should certainly be left in place; and that leaving footings, cuttings and pipelines in place, with subsequent monitoring, would also be justified unless very large values were placed by society on a clear seabed and trawling access. 相似文献
854.
Ling R. Zeng Li H. Shi Xin G. Meng J. Xu Gui F. Jia T. Gui 《Journal of environmental science and health. Part. B》2019,54(4):317-325
This study evaluated the hydrolysis and photolysis kinetics of pyraclostrobin in an aqueous solution using ultra-high-performance liquid chromatography–photodiode array detection and identified the resulting metabolites of pyraclostrobin by hydrolysis and photolysis in paddy water using high-resolution mass spectrometry coupled with liquid chromatography. The effect of solution pH, metal ions and surfactants on the hydrolysis of pyraclostrobin was explored. The hydrolysis half-lives of pyraclostrobin were 23.1–115.5?days and were stable in buffer solution at pH 5.0. The degradation rate of pyraclostrobin in an aqueous solution under sunlight was slower than that under UV photolysis reaction. The half-lives of pyraclostrobin in a buffer solution at pH 5.0, 7.0, 9.0 and in paddy water were less than 12?h under the two light irradiation types. The metabolites of the two processes were identified and compared to further understand the mechanisms underlying hydrolysis and photolysis of pyraclostrobin in natural water. The extracted ions obtained from paddy water were automatically annotated by Compound Discoverer software with manual confirmation of their fragments. Two metabolites were detected and identified in the pyraclostrobin hydrolysis, whereas three metabolites were detected and identified in the photolysis in paddy water. 相似文献
855.
Makarov M. I. Kadulin M. S. Turchin S. R. Malysheva T. I. Aksenova A. A. Onipchenko V. G. Menyailo O. V. 《Russian Journal of Ecology》2019,50(4):337-342
Russian Journal of Ecology - Abstract—The study of the effect of mycorrhiza symbiosis on the transformation of carbon and nitrogen compounds in soils is important in view of the necessity to... 相似文献
856.
Vasil’ev A. G. Bol’shakov V. N. Vasil’eva I. A. Gorodilova Yu. V. Chibiryak M. V. 《Russian Journal of Ecology》2019,50(4):361-371
Russian Journal of Ecology - A simultaneous analysis of the chronographic variation of the mandible of bank vole (Clethrionomys glareolus Shreb.) in three longitudinally distant populations that... 相似文献
857.
Russian Journal of Ecology - Temporal and spatial variations of phytoplankton community in Lake Erhai were investigated from May 2010 to April 2011. A total of 124 species belonging to 8 phyla and... 相似文献
858.
Solimeno Alessandro Gómez-Serrano Cintia Acién Francisco Gabriel 《Environmental science and pollution research international》2019,26(25):25855-25868
Environmental Science and Pollution Research - A new set up of the integral mechanistic BIO_ALGAE model that describes the complex interactions in mixed algal-bacterial systems was developed to... 相似文献
859.
This paper introduces an integrated water management model at the industrial park level. It suggests four approaches to water
management: first, direct water reuse among users; second, water reuse among users by blending with freshwater; third, water
reuse between users and a wastewater treatment plant; and fourth, groundwater recharge by reclaimed wastewater or other feasible
applications in order to optimize the overall water efficiency. The model results in a comprehensive management methodology
for optimizing water resources within an industrial park, seeking potential water reuse among industries, and incorporating
the size and cost of reclaimed wastewater delivery systems. A case study is employed to test the model’s feasibility. An economic
analysis of the optimized water use network is also carried out, showing the potential water and cost savings. 相似文献
860.
Use of geographic information systems for assessing groundwater pollution potential by pesticides in Central Thailand 总被引:12,自引:0,他引:12
This study employed geographic information systems (GIS) technology to evaluate the vulnerability of groundwater to pesticide pollution in Thailand. The study area included three provinces, Kanchana Buri, Ratcha Buri, and Suphan Buri, located in west-central Thailand. Factors used for the vulnerability assessment included soil texture, slope, land use, well depth, and rainfall. These vulnerability factors were reclassified to a common scale, and a weighted average was computed to yield a vulnerability score. Vulnerability factors and weights were assigned considering pesticide concentrations in 90 wells throughout the study area. Well depth was the most significant vulnerability factor. Groundwater vulnerability maps were generated for several pesticides. The eastern, agricultural part of the study area has relatively deep wells and fine soils. Shallow wells are present in the mountainous west; however, fewer pesticides are applied in that region. Consequently, much of the study area had a medium groundwater vulnerability rating, although there were pockets of high vulnerability, for example, in agricultural areas with shallow wells. The groundwater vulnerability maps are effective for identifying locations warranting more detailed groundwater pollution and vulnerability investigations. 相似文献