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81.
Dominika Lewicka-Szczebak Adriana Trojanowska Maciej Górka Mariusz-Orion Jędrysek 《Environmental Chemistry Letters》2008,6(3):169-173
We show that sulphur isotopic composition can be a useful tool to discriminate between various sources of sulphate and a tool
for better understanding of the sulphur cycling and mass balance. Our investigations, carried out in a dam reservoir, demonstrate
differences in sulphur biogeochemistry between different seasons, caused by recharge water supply in spring and intensive
sulphate reduction in summer. In the riverine-affected part of the reservoir δ34S(SO4
2−) varied from 4.7 to 5.9‰ in spring, and from 4.1 to 4.6‰ in summer. In the lacustrine-affected part δ34S(SO42−) varied from 4.0 to 5.0‰ in spring, and from 4.5 to 5.4‰ in summer. Diurnal variations of δ34S(SO4
2−) were negligible as compared to seasonal variations. 相似文献
82.
83.
Sprovieri M Oliveri E Di Leonardo R Romano E Ausili A Gabellini M Barra M Tranchida G Bellanca A Neri R Budillon F Saggiomo R Mazzola S Saggiomo V 《Journal of environmental monitoring : JEM》2011,13(6):1753-1760
The Augusta basin, located in SE Sicily (southern Italy), is a semi-enclosed marine area, labelled as a highly contaminated site. The release of mercury into the harbour seawater and its dispersion to the blue water, make the Augusta basin a potential source of anthropogenic pollution for the Mediterranean Sea. A mass balance was implemented to calculate the HgT budget in the Augusta basin. Results suggest that an average of ~0.073 kmol of HgT is released, by diffusion, on a yearly basis, from sediments to the seawater, with a consequent output of 0.162 kmol y(-1) to coastal and offshore waters; this makes the Augusta area an important contributor of mercury to the Mediterranean Sea. Owing to the geographical location of the Augusta basin, its outflowing shelf-waters are immediately intercepted by the surface Atlantic Ionian Stream (AIS) and mixed with the main gyres of the eastern Mediterranean Sea, thus representing a risk for the large-scale marine system. 相似文献
84.
Gioda A Amaral BS Monteiro IL Saint'Pierre TD 《Journal of environmental monitoring : JEM》2011,13(8):2134-2142
Aerosol particle samples (PM10) were collected at urban, industrial and rural sites located in Rio de Janeiro, Brazil, between October 2008 and September 2009. Aerosol samples for each site were analyzed for total and soluble metals, water-soluble ions, carboxylic acids, and water-soluble organic carbon (WSOC). The results showed that the mean PM10 concentrations were 34 μg m(-3); 47 μg m(-3) and 71 μg m(-3) at the rural, urban and industrial sites, respectively. An increase in the average concentration of these particles due to air stagnation was observed during the period from May to September for all sites, and an increase in hospitalization for respiratory problems was also reported. On average, the anions species represented 4 to 14% of total content, while cations species corresponded to 1 to 11% and 7.5% for WSOC. The overall metal content at the industrial site was nearly the double that at the rural site. The concentrations of the studied species are influenced mainly by site location and the specific characteristics present at each site. However, higher concentrations of some species were observed on particular dates and were probably due to biomass burning and African dust events. The acid/aqueous percentiles showed that the most efficiently extracted metals from the aqueous phase were V and Ni (40%), while Al and Fe represented a lower percentage (<3%). Analysis of the aqueous fraction provides important information about the bioavailability of metals that is associated with the inflammatory process in the lungs. 相似文献
85.
Meneses-Jácome Alexander Ruiz-Colorado Angela Adriana 《Environmental science and pollution research international》2021,28(4):4195-4208
Environmental Science and Pollution Research - The energy potential of high-organic loaded agro-industrial effluents receiving biological treatment is often neglected, particularly in emergent... 相似文献
86.
Adriana A. Gili Elke J. Noellemeyer Mónica Balzarini 《Environmental and Ecological Statistics》2013,20(2):237-252
The issue of variances of different soil variables prevailing at different sampling scales is addressed. This topic is relevant for soil science, agronomy and landscape ecology. In multi-stage sampling there are randomness components in each stage of sampling which can be taken into account by introducing random effects in analysis through the use of hierarchical linear mixed models (HLMM). Due to the nested sampling scheme, there are several hierarchical sub-models. The selection of the best model can be carried out through likelihood ratio tests (LRTs) or Wald tests, which are asymptotically equivalent under standard conditions. However, when the comparison leads to a restricted hypothesis of variance components, standard conditions are not maintained, which leads to more elaborated versions of LRTs. These versions are not disseminated among environmental scientists. The present study shows the modeling of soil data from a sampling where sites, fields within sites, transects within fields, and sampling points within transects were selected in order to take samples from different vegetation types (open and shade). For soil data, several sub-models were compared using Wald tests, classic LRTs and adjusted LRTs where the distribution of the test statistic under the null hypothesis is the Chi-square mixture of Chi-square distributions. The inclusion of random effects via HLMM and suggested by the latest version of LRT allowed us to detect effects of vegetation type on soil properties that were not detected under a classical ANOVA. 相似文献
87.
Cousillas A Pereira L Heller T Alvarez C Mañay N 《Environmental geochemistry and health》2012,34(2):207-211
Environmental lead contamination in Uruguay became a matter of public concern in 2001, when cases of children with blood lead
levels (BLL) higher than 20 μg/dl appeared in some low-income neighborhoods of Montevideo, being 10 μg/dl the intervention
reference BLL. The aim of this paper is to show the results of multidisciplinary actions taken by decisions makers in social,
environmental and healthcare aspects, to minimize lead exposure risks. We evaluated changes in blood lead levels of different
children and non-exposed adult populations before and after the actions were taken, from 2001 on. For children populations and non-exposed adults, we found a significant decrease of
almost 50% in BLL compared with studies done before the actions were taken. The main action to consider was the phasing out
process of leaded gasoline in our country among other. We conclude that the integration of inter and multidisciplinary actions
promoted was of high impact on the population, bringing about a public sensitization and growing awareness of the lead environmental
risks. 相似文献
88.
Jordán Manuel Miguel Montero María Adriana Pardo-Fabregat Francisco 《Journal of Material Cycles and Waste Management》2021,23(2):707-716
Journal of Material Cycles and Waste Management - The substitution of standard clays to residues, in this case copper smelter slag and fly ashes coming from the incineration process of MSW in... 相似文献
89.