全文获取类型
收费全文 | 135篇 |
免费 | 5篇 |
国内免费 | 14篇 |
专业分类
废物处理 | 3篇 |
环保管理 | 11篇 |
综合类 | 39篇 |
基础理论 | 16篇 |
污染及防治 | 11篇 |
评价与监测 | 4篇 |
社会与环境 | 70篇 |
出版年
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 4篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 7篇 |
2011年 | 19篇 |
2010年 | 18篇 |
2009年 | 30篇 |
2008年 | 4篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 15 毫秒
51.
Legarda F Romero LM Herranz M Barrera M Idoeta R Valiño F Olondo C Caro A 《Journal of environmental radioactivity》2011,102(6):589-597
In this study the total activity of 137Cs deposited per unit area over the Spanish peninsular territory was analysed using a 150 × 150 km2 mesh grid, with samples taken from 29 points. The deposited activities ranged between 251 and 6074 Bq/m2. A linear relationship was obtained between these values and the mean annual rainfall at each sampling point which allowed a map to be drawn, using GIS software, which shows the distribution of total deposited 137Cs activity across the Spanish mainland. At twelve of these sampling points the vertical migration profile of 137Cs was obtained. These profiles are separated into two groups with different behaviour, one of which includes clay and loam soils and the other containing sandy soils. For both groups of profiles the parameters of the convective-diffusive model, which describes the vertical migration of 137Cs in the soil, v (apparent convection velocity) and D (apparent diffusion coefficient) were calculated. 相似文献
52.
Anttila A Leppänen AP Rissanen K Ylipieti J 《Journal of environmental radioactivity》2011,102(7):659-666
Samples of summer pasture plants that reindeer feed on were collected in order to study 137Cs concentrations in different plant species and in species nested in certain site types, and to study the regional distribution of 137Cs in the Finnish reindeer management area. Plant species were categorized by the site types of mineral soil forest (xeric heath forest and mesic heath forest) and peatland. A third category called ’other plant species’ included plants with various site types, poorly determined species and species with poor statistics. The 137Cs concentrations in different site types differed significantly. The mean 137Cs concentrations of the whole reindeer management area in the xeric heath forest plant species was 44 ± 27 Bq/kg dw, in the mesic heath forest plant species 75 ± 59 Bq/kg dw and in the peatland plant species 219 ± 150 Bq/kg dw. The peatland species uptake 137Cs more efficiently than plant species of mineral soil forests. A particularly efficient collector of 137Cs was Trichophorum sp. It is suggested that Trichophorum sp. could be used as an indicator species for reindeer summer fodder plants. The highest concentrations of 137Cs were found in Southern Lapland and the lowest in Northern Lapland. Today, the concentrations of 137Cs in summer pasture plants that reindeer feed on in Finland are at such a level that there is no need to avoid any plant species. In the case of future nuclear fallout, reindeer grazing in peatlands would increase concentrations of 137Cs in reindeer meat. 相似文献
53.
Radioiodine and radiocesium in Thessaloniki, Northern Greece due to the Fukushima nuclear accident 总被引:1,自引:0,他引:1
Manolopoulou M Vagena E Stoulos S Ioannidou A Papastefanou C 《Journal of environmental radioactivity》2011,102(8):796-797
Radioiodine (131I) in air and rainwater as high as 497 μBq m−3 and 0.7 Bq L−1, respectively, as well as 137Cs and 134Cs in air as high as 145 μBq m−3 and 126 μBq m−3, respectively were recorded in Thessaloniki, Northern Greece (40°38′N, 22°58′E) from March 24, 2011 through April 09, 2011, after a nuclear accident occurred at Fukushima, Japan (37°45′N, 140°28′E) on March 11, 2011. 相似文献
54.
To evaluate the quantities of 137Cs from past nuclear tests being transported to and deposited in Japan by naturally-occurring phenomena, the authors developed long-range transport models for 137Cs considering Asian dust. The simulation using these models backed the observed recent increase of 137Cs deposition along the coast of the Sea of Japan in early spring. For the sake of public safety, it is vital to ascertain whether an increase of radioactive deposition is caused by natural phenomena or a nuclear accident. The observations in recent years have suggested that dust and soil containing 137Cs is transported from the regions around Inner Mongolia to Japan by the wind. In this paper, using observation data from the early spring of 2002 and 2006, the authors have found good agreement between the simulations and the measurements. The simulations reproduced the entrainment of 137Cs and subsequent transport to Japan caused by strong winds associated with low pressure areas around the Inner Mongolian grasslands. The most likely cause of high-level 137Cs deposition over northern Japan during March 2002 was 137Cs associated with particles transported at low-altitude (1 km) and subjected to precipitation on the 22nd to 24th. 相似文献
55.
Rask M Saxén R Ruuhijärvi J Arvola L Järvinen M Koskelainen U Outola I Vuorinen PJ 《Journal of environmental radioactivity》2012,103(1):41-47
We summarize the patterns of 137Cs activity concentrations and transfer into fish and other biota in four small forest lakes in southern Finland during a twenty-year period following the Chernobyl accident in April 1986. The results from summer 1986 showed fastest accumulation of 137Cs into planktivorous fishes, i.e. along the shortest food chains. Since 1987, the highest annual mean values of 137Cs have been recorded in fish occupying the highest trophic levels, for perch (Perca fluviatilis) 13,600 Bq/kg (ww) and for pike (Esox lucius) 20,700 Bq/kg (ww). At the same time, activity concentrations of 137Cs in crustacean zooplankton and Asellus aquaticus have ranged between 1000 and 19,500 Bq/kg (dw). In 2006, 5-28% of the 1987 137Cs activity concentration levels were still present in perch and pike. Since 1989 their 137Cs activity concentrations in oligohumic seepage lakes have remained significantly higher than in polyhumic drainage lakes due to the increased transfer of 137Cs into fish in the seepage lakes with lower electrolyte concentrations, longer water retention times and lower sedimentation rate. 相似文献
56.
57.
H. Florou 《Chemistry and Ecology》1996,12(4):253-258
This study deals with 137Cs dispersion and behaviour in the Aegean and Ionian Sea based on work done during the period 1984-1994, as a brief general review. Sea water, sediment and marine biota were analysed and measured by gamma spectrometry and the activity concentrations of 137Cs were evaluated with consideration to the sources of pollution. According to 137Cs levels the period is distinguished into three sub-periods, the pre-Chernobyl, the early Chernobyl influence and the late Chernobyl influence period. During the early period of the Chernobyl accident the 137Cs levels in the Greek marine environment increased roughly up to an order of magnitude if compared with the pre-accident ones. Since 1988, the late impact of the accident is focused mainly in the North Aegean Sea, at the Dardanelles mouth, due to the Black Sea outflow. 相似文献
58.
本文报道了新疆核试验场周围地区9个调查区17种主要食品中~(90)Sr、~(137)Cs含量分别为1.1~72.3,0.3~40.7×10~(-2)B_q·Kg~(-1);3个对照区分别为1.6~68.4,0.6~27.4×10~(-2)B_q·K_g~(-1)。两地区同类食品中~(90)Sr、~(137)Cs平均含量基本一致。调查区~(90)Sr、~(137)Cs所致成年居民有效剂量当量值分别为2μSV(集体剂量当量为30.0人· SV);0.3μSV(4.5人· SV)。对照区分别为2.2μSV(集体剂量当量为20.9人·SV);0.4μSV(3.0人·SV)。可见我国核试验产生的~(90)Sr、~(137)Cs对核试验场周围地区食品没有造成明显的局部污染,所致居民剂量当量负担仅为我国天然外照射所致年有效剂量当量(952μSV)的0.2%和0.03%。对该地区的广大居民健康不会产生有害的影响。 相似文献
59.
Giaufausto Salvadori Sergio P. Ratti Giuseppe Belli 《Environmental science and pollution research international》1997,4(2):91-98
A few case studies will be presented involving both radioactive and chemical pollution at small, medium, and large space-time
scales. Reported are recent advances in the field of environmental pollution involving the use of fractals and multifractals.
The mathematical tools proposed here may offer new perspectives for investigating many of the problems of nonlinear variability
which commonly arise when dealing with pollutants, such as the presence of outliers and the sparseness of the sampling networks.
They may also lead to a simplification of the models adopted for studying natural phenomena, thanks to a scaling approach.
Finally, they may provide parameters whose values are directly related to the nonlinear dynamics involved in the pollutant
distribution in the environment which, in turn, may be relevant for computer simulation and epidemiological or risk assessment
purposes. 相似文献
60.