全文获取类型
收费全文 | 713篇 |
免费 | 26篇 |
国内免费 | 44篇 |
专业分类
安全科学 | 94篇 |
废物处理 | 3篇 |
环保管理 | 137篇 |
综合类 | 163篇 |
基础理论 | 75篇 |
环境理论 | 7篇 |
污染及防治 | 172篇 |
评价与监测 | 67篇 |
社会与环境 | 37篇 |
灾害及防治 | 28篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 26篇 |
2021年 | 13篇 |
2020年 | 19篇 |
2019年 | 16篇 |
2018年 | 11篇 |
2017年 | 17篇 |
2016年 | 27篇 |
2015年 | 35篇 |
2014年 | 20篇 |
2013年 | 40篇 |
2012年 | 20篇 |
2011年 | 44篇 |
2010年 | 25篇 |
2009年 | 53篇 |
2008年 | 67篇 |
2007年 | 51篇 |
2006年 | 34篇 |
2005年 | 25篇 |
2004年 | 27篇 |
2003年 | 25篇 |
2002年 | 20篇 |
2001年 | 21篇 |
2000年 | 23篇 |
1999年 | 12篇 |
1998年 | 15篇 |
1997年 | 16篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 10篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1972年 | 2篇 |
排序方式: 共有783条查询结果,搜索用时 15 毫秒
121.
Norovirus Detection in Groundwater 总被引:2,自引:0,他引:2
122.
123.
124.
125.
Even in the absence of mobilization of dense nonaqueous phase liquid (DNAPL), the microemulsion that forms when the surfactant solubilizes a dense contaminant such as trichloroethylene will be more dense than water and tends to migrate downward. This paper addresses the issue of migration with a new concept: surfactant enhanced aquifer remediation at neutral buoyancy. Laboratory results of surfactant remediation in two-dimensional model aquifers show that downward migration of microemulsion containing solubilized dense contaminants can be reduced to an acceptable level, even in the absence of capillary barriers in the aquifer. One model experiment was designed to exhibit a small degree of vertical migration and full capture of the microemulsion at the extraction well. The second experiment was designed to demonstrate the effect of large buoyancy forces that lead to excessive downward migration of the microemulsion. Density measurements of aqueous solutions containing sodium dihexyl sulfosuccinate surfactant, isopropanol, trichloroethylene, and sodium chloride are presented. A companion paper presents the results of the flow and transport calculations needed for this approach to surfactant flooding. 相似文献
126.
石墨炉原子吸收光谱法测定地面水中铝 总被引:2,自引:0,他引:2
用石墨炉原子吸收分光光度法,采用加入基体改进剂技术,建立了测定铝的原子吸收光谱分析的新方法。该方法的线性范围为0~20μg/L,检出限为0.042μg/L,相对标准偏差为1.51%,回收率为962%~101.6%.用于监测地面水中铝,获得满意结果。 相似文献
127.
介绍了沈阳市在生态城市建设中的成绩 ,提出积极推进生态城市建设中要切实注重的几个问题———进一步完善森林城市生态规划 ,提高水资源利用率 ,建设节水型社会 ,保护地下水 ,使人民群众喝上安全合格的水 ,提出对策建议。 相似文献
128.
Groundwater management and socio-economic responses 总被引:1,自引:0,他引:1
Jacob J. Burke Claude Sauveplane and Marcus Moench President 《Natural resources forum》1999,23(4):303-313
The socio-economic aspects of groundwater development and management are briefly examined and set against a background of highly technical management. The variability of socio-economic responses to groundwater and the problems of engaging large numbers of individual users are highlighted. The paper argues that social, institutional and political factors are the primary obstacles to sustainable management of the world's groundwater resources. 相似文献
129.
130.
A volume of sand containing coal tar creosote was emplaced below the water table at CFB Borden to investigate natural attenuation processes for complex biodegradable mixtures. Coal tar creosote is a mixture of more than 200 polycyclic aromatic hydrocarbons, heterocyclic compounds and phenolic compounds. A representative group of seven compounds was selected for detailed study: phenol, m-xylene, naphthalene, phenanthrene, 1-methylnaphthalene, dibenzofuran and carbazole. Movement of groundwater through the source led to the development of a dissolved organic plume, which was studied over a 4-year period. Qualitative plume observations and mass balance calculations indicated two key conclusions: (1) compounds from the same source can display distinctly different patterns of plume development and (2) mass transformation was a major influence on plume behaviour for all observed compounds. 相似文献