全文获取类型
收费全文 | 1057篇 |
免费 | 52篇 |
国内免费 | 411篇 |
专业分类
安全科学 | 69篇 |
废物处理 | 73篇 |
环保管理 | 103篇 |
综合类 | 555篇 |
基础理论 | 170篇 |
污染及防治 | 404篇 |
评价与监测 | 55篇 |
社会与环境 | 52篇 |
灾害及防治 | 39篇 |
出版年
2023年 | 20篇 |
2022年 | 59篇 |
2021年 | 44篇 |
2020年 | 40篇 |
2019年 | 48篇 |
2018年 | 56篇 |
2017年 | 61篇 |
2016年 | 69篇 |
2015年 | 66篇 |
2014年 | 71篇 |
2013年 | 108篇 |
2012年 | 82篇 |
2011年 | 98篇 |
2010年 | 71篇 |
2009年 | 60篇 |
2008年 | 59篇 |
2007年 | 62篇 |
2006年 | 49篇 |
2005年 | 51篇 |
2004年 | 29篇 |
2003年 | 33篇 |
2002年 | 31篇 |
2001年 | 21篇 |
2000年 | 37篇 |
1999年 | 24篇 |
1998年 | 27篇 |
1997年 | 28篇 |
1996年 | 25篇 |
1995年 | 14篇 |
1994年 | 15篇 |
1993年 | 6篇 |
1992年 | 12篇 |
1991年 | 11篇 |
1990年 | 15篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1520条查询结果,搜索用时 15 毫秒
51.
52.
53.
基于模糊四元联系数的防洪工程体系安全综合评价模型 总被引:6,自引:1,他引:5
防洪工程体系是由随机、模糊、未确知等众多不确定性因子组成的复杂系统,它至今仍是洪水灾害管理的主体,对该体系综合安全进行定量评价可为洪水灾害管理提供重要依据.模糊四元联系数是集对分析中同异反联系数的推广,它可更深入地分析系统中的各种不确定性.利用模糊四元联系数建立了防洪工程体系安全综合评价模型,用联系度可描述评价对象与评价标准之间的关系,其结果简便直观,能清晰地反应评价对象和评价标准间的动态联系.用该模型综合评价了实际防洪工程体系的安全程度,其结果与物元分析等方法所得结果一致. 相似文献
54.
Deng DM Shu WS Zhang J Zou HL Lin Z Ye ZH Wong MH 《Environmental pollution (Barking, Essex : 1987)》2007,147(2):381-386
To investigate the variation of Zn and Cd accumulation and tolerance of Sedum alfredii (a newly reported Zn/Cd hyperaccumulator), field surveys and hydroponic experiments were conducted among three populations of this species: two originating from old Pb/Zn mines in Zhejiang (ZJ) and Hunan (HN) Provinces and one from a "clean" site in Guangdong (GD) Province, China. Under field conditions, up to 12,524 and 12,253 mg kg(-1) Zn, and 1400 and 97 mg kg(-1) Cd in shoots of ZJ and HN plants were recorded respectively. Under hydroponic conditions, ZJ and HN plants accumulated significantly higher Zn and Cd in their leaves and stems, and possessed significantly higher Zn and Cd tolerance than GD plants. Among the two contaminated populations, ZJ plants showed higher Cd tolerance and accumulation (in leaves) than HN plants. The present results indicate that significant differences in Zn and Cd accumulation and tolerance exist in populations of S. alfredii. 相似文献
55.
56.
ABSTRACTInteraction of environmental pollution between peripheral areas has become a central topic in the field of resources and environment but little is known about the actual impact on peripheral areas in the current literature. This paper sets out a simultaneous equation model to investigate the spillover effect of environmental pollution between China’s peripheral areas utilizing the panel data of 218 cities in China. Making use of indicators for measuring the impact on environmental pollution, it identifies that environmental pollution between cities of China has a significant two-way spillover effect. After standardization of variables, it is found that the spillover effect of peripheral areas on urban environmental pollution cannot be neglected. Nearly, a third of the environmental pollution level in a city is induced by the environmental pollution in peripheral areas. If the indicator of environmental pollution in peripheral areas is missing, wrong conclusions will be drawn. Therefore, government should shift the emphasis of environmental regulation from local to global, and improve the overall environmental quality through coordinated management of regional environment. 相似文献
57.
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
58.
Bozhi Ren Yalin Zhou Hongpu Ma Renjian Deng Peng Zhang Baolin Hou 《Journal of Material Cycles and Waste Management》2018,20(1):193-200
Sb release characteristics of blast furnace slag, mining waste rock and tailing sand were investigated in static immersion and dynamic leaching test. These three kinds of waste samples were collected from the antimony mine in Lengshuijiang, China, produced in mining smelting process. Effects of solid/liquid ratio, sample size and pH of leaching solution on Sb release characteristics were inspected based on the analysis of scanning electron microscope, pH and EC of leachate. The optimal parameters for Sb leaching of each sample were analyzed. For blast furnace slag and mining waste rock, Sb release contents increased along with the decline of solid/liquid ratio. The maximum accumulative release contents were 42.13, 34.26 mg/kg at the solid/liquid ratio of 1:20. While Sb release content for tailing sand decreased first and then increased with the reduction of solid/liquid ratio. When the solid/liquid ratio was 1:5, the accumulative Sb release content reached the most (24.30 mg/kg). Sb release content of mining waste rock increased with the drop of leaching solution pH, with the highest accumulative release content of 26.01 mg/kg at pH 2.0. Sb release contents of blast furnace slag and tailing sand showed positive correlation with the variation of leaching solution pH. The maximum accumulative release contents of these two samples were 215.91 and 147.83 mg/kg, respectively, when leaching solution pH was 7.0. In summary, Sb release capacity of the three samples in descending order was tailing sand, blast furnace slag and mining waste rock. pH and EC of the leachate in dynamic test varied independently with the initial pH of leaching solution while showing close relationship with mineral hydrolysis in the waste. 相似文献
59.
60.