全文获取类型
收费全文 | 733篇 |
免费 | 4篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 19篇 |
废物处理 | 40篇 |
环保管理 | 31篇 |
综合类 | 114篇 |
基础理论 | 151篇 |
环境理论 | 1篇 |
污染及防治 | 235篇 |
评价与监测 | 102篇 |
社会与环境 | 43篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 6篇 |
2022年 | 18篇 |
2021年 | 16篇 |
2020年 | 11篇 |
2019年 | 16篇 |
2018年 | 26篇 |
2017年 | 29篇 |
2016年 | 39篇 |
2015年 | 23篇 |
2014年 | 45篇 |
2013年 | 103篇 |
2012年 | 43篇 |
2011年 | 52篇 |
2010年 | 36篇 |
2009年 | 25篇 |
2008年 | 26篇 |
2007年 | 30篇 |
2006年 | 28篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 12篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1998年 | 2篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1987年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 6篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1970年 | 4篇 |
1969年 | 2篇 |
1968年 | 2篇 |
1967年 | 3篇 |
1966年 | 2篇 |
1965年 | 2篇 |
1964年 | 3篇 |
1961年 | 3篇 |
1960年 | 5篇 |
1959年 | 10篇 |
1958年 | 12篇 |
1957年 | 5篇 |
1956年 | 9篇 |
1928年 | 1篇 |
排序方式: 共有738条查询结果,搜索用时 15 毫秒
1.
CO concentrations were measured in five kindergartens, one children's hospital and two homes for aged, practically without indoor sources, all situated in the city centre, for ten random days in winter and ten in summer. The indoor CO concentrations were the result of the distance from and the traffic density in the nearest street, of general pollution level, seasonal differences, day-to-day variations and daily cycle of air pollution, the vicinity of traffic having a dominant influence. Therefore location of institutions for sensitive population groups in old city centres within a block of houses seems to be a suitable solution as far as exposure to CO is concerned.Revised version of a paper presented as poster at the VIth World Congress on Air Quality, Paris 1983. 相似文献
2.
3.
Pavle I. Premović 《Die Naturwissenschaften》1982,69(10):479-482
The Middle Precambrian chert of Gunflint formation contains an exceptionally high amount of bitumen free radicals. The Gunflint chert appears to be the oldest formation in which the presence of these radicals has been found. Their presence in this deposit constitutes evidence for the existence of primitive protovascular plants in the early Proterozoic environment of the Lake Superior Region of Canada. 相似文献
4.
5.
6.
7.
Radioactive contamination of wood and its products 总被引:1,自引:0,他引:1
This paper presents research on radioactive contamination of the three most common kinds of wood in Croatia--beech, oak and fir as well as acorn. Gamma-spectrometric measurements carried out on the samples of bark and wood of beech, oak, fir and acorn have shown radioactivity contents ranging from 1.6 +/- 0.1 to 37.3 +/- 0.5 Bq/kg from deposited 137Cs, whose concentrations in the soil of Croatia have increased after the Chernobyl accident. Measurements have also shown the radioactivity originating from 40K and 214Bi, which are part of the natural composition of the soil. The distribution of the radionuclides in wood has been discussed, as well as the impact of radioactive contamination of wood by the artificial radionuclide 137Cs upon the forest ecosystem. According to the corresponding model, it has been calculated that a 10 h daily stay in a typical family house increases the annual radiation dose of the population, due to the deposited 137Cs in the structure or furniture, by 343 microSv. 相似文献
8.
Spatial distribution of 238U and 226Ra activities in sediment columns along the Krka River and estuary, were studied using gamma spectrometry. Markedly different 238U and 226Ra activities between riverine, estuarine and marine sediments were observed. Distribution of these radionuclides, as well as their anthropogenic and natural origin, was evaluated by activity measurements, taking into account sedimentation rates estimated by 137Cs distribution in sediment columns. 相似文献
9.
Uptake of 51Cr(III) is faster than uptake of 51Cr(VI), but it occurs mainly on the surface of the animals. Steady state is attained after 28 d. The resulting concentration factor is about 200. Although the uptake of 51Cr(VI) is slower, it is more intensively distributed into the organs and tissues of the animals. Steady state was not attained during the experiments (35 d); the highest concentration factor reached was about 10. The uptake of both 51Cr(III) and 51Cr(VI) seems to be passive. For both chemical forms of chromium, the loss rate is inversely proportional to the exposure time. When the uptake lasted longer, owing to the distribution of Cr(VI) into the organs and tissues, the loss rate of Cr(III) is somewhat faster relative to the loss rate of 51Cr(VI). The opposite is the case when the uptake of both forms lasts only two days. On the basis of the distribution and loss experiments, we argue that hexavalent chromium in living organisms is reduced to the trivalent form and then complexed with organic molecules. 相似文献
10.
Tomáš Navrátil Marek Vach Petr Skřivan Martin Mihaljevič Irena Dobešová 《Water, Air, & Soil Pollution: Focus》2004,4(2-3):619-630
The deposition of trace elements and their fate in a forest ecosystemhas been monitored at the experimental site, Lesni Potok catchment (LP), with granite bedrock. The catchment is located 30 km ESE from Prague. Annual bulk Pb-deposition flux FPb was 3.41 kg km-2 a-1 in 1994 and gradually decreased to 0.49 kg km-2 a-1 in 2001. The decrease is comparable with those observed in Germany and in the U.S.A. in the 1970s and 1980s. The total sales ban of leaded gasoline in the Czech Republic since January 2001 was accompanied by a pronounced decrease of FPb in a single year. The residual Pb-deposition flux is assigned to both the long-range transport of fine-grained vehicular lead aerosol (with a long residence time in the atmosphere) and to theemissions from power plant boilers burning lignite mined in the Czech northwest coal basin. The FPb of lead correlates stronglywith those of As, Cd, Cu, Zn and Be, the typical metals in coal fly ash, at two monitored sites. Topsoil horizons contain elevated concentrations of Pb (53–67 mg kg-1), which are of anthropogenicorigin. Soils in the riparian areas contain increased concentrations of Pb when compared to soils on the hillslope areas. Significant amounts of Pb were found on a stream substrate and Fe-precipitate sampled from the stream. Low concentrations of Pb in bark and bole wood suggest that the uptake of Pb by vegetation is negligible. The very small surface water outputs (average of 0.002 kg km-2 a-1) compared to inputs (average of 1.890 kg km-2 a-1) from the LP catchment indicate an ongoing accumulation of Pb in a forested landscape. 相似文献