全文获取类型
收费全文 | 516篇 |
免费 | 13篇 |
国内免费 | 13篇 |
专业分类
安全科学 | 51篇 |
废物处理 | 4篇 |
环保管理 | 55篇 |
综合类 | 275篇 |
基础理论 | 17篇 |
污染及防治 | 21篇 |
评价与监测 | 115篇 |
社会与环境 | 3篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 26篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2017年 | 15篇 |
2016年 | 17篇 |
2015年 | 15篇 |
2014年 | 35篇 |
2013年 | 49篇 |
2012年 | 27篇 |
2011年 | 40篇 |
2010年 | 24篇 |
2009年 | 23篇 |
2008年 | 25篇 |
2007年 | 25篇 |
2006年 | 26篇 |
2005年 | 15篇 |
2004年 | 13篇 |
2003年 | 21篇 |
2002年 | 23篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 11篇 |
1998年 | 17篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 12篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 11篇 |
1991年 | 1篇 |
1987年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1973年 | 4篇 |
排序方式: 共有542条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
环境监测实验室质量监督之管见 总被引:3,自引:0,他引:3
郭晓茆 《环境监测管理与技术》2007,19(6):1-3
阐述了环境监测实验室质量监督的重要性及加强质量监督的组织保证、制度建设、工作程序和如何发挥监督作用的思考,以期改善忽视质量监督的局面,进一步提高监测工作质量. 相似文献
45.
Bottled water may not be safer, or healthier, than tap water. The present studies have proved that styrene and some other aromatic compounds leach continuously from polystyrene (PS) bottles used locally for packaging. Water sapmles in contact with PS were extracted by a preconcentration technique called as "purge and trap" and analysed by gas chromatograph-mass spectrometer (GC/MS). Eleven aromatic compounds were identified in these studies. Maximum concentration of styrene in PS bottles was 29.5 μg/L. Apart from styrene, ethyl benzene, toluene and benzene were also quantified but their concentrations were much less than WHO guide line values. All other compounds were in traces. Quality of plastic and storage time were the major factor in leaching of styrene. Concentration of styrene was increased to 69.53 μg/L after one-year storage. In Styrofoam and PS cups studies, hot water was found to be contaminated with styrene and other aromatic compounds. It was observed that temperature played a major role in the leaching of styrene monomer from Styrofoam cups. Paper cups were found to be safe for hot drinks. 相似文献
46.
Urbanization and its impact on groundwater: a remote sensing and GIS-based assessment approach 总被引:1,自引:0,他引:1
The perils of unplanned urbanization and increasing pressure of human activities on hydro-geomorphologic system often result
in modification of the existing recharge mechanism, which leads to many environmental consequences. In the present research,
an attempt has been made to investigate the applicability of remote sensing and geographical information system (GIS) in dealing
with spatial and temporal variability of dynamic phenomena, like urbanization and its impact on groundwater. This paper covers
primarily, quantitative and qualitative impacts of urban growth on the behavior of aquifer in Ajmer city (India). Urban growth
of the Ajmer city in last 17 years has been estimated from the satellite images. Database related to urbanization and groundwater
has been created in GIS. Groundwater recharge has been computed using a water balance approach known as Water Level Fluctuation
Methodology. Recharge estimation methodology has been implemented in GIS to introduce the spatial variability of hydro-geological
characteristics. Further, temporal and spatial variations in groundwater quality and quantity have been correlated with urban
growth using overlay analysis in GIS. The study reveals a general decline in water table and quality with urbanization. Further,
remote sensing and GIS technologies have been found useful in assessment of spatial and temporal phenomena of urbanization
and its impact on groundwater system. 相似文献
47.
酸沉降影响稻米品质的新发现 总被引:2,自引:0,他引:2
酸沉降影响了稻米质量和口感.酸雨时空分布从宏观上概括了稻米品质的地理分布.酸雨决定了酶活性相关金属离子的丰缺,继而影响淀粉合成关键酶的活性,最终影响淀粉合成质量.温度变化是表象,降雨pH值变化是条件,酶活性相关金属离子丰缺是根本,实质是酶活性相关金属离子或激活或抑制了支链淀粉合成关键酶的活性.提出了改善粮食作物质量的化控创新技术路线. 相似文献
48.
49.
50.