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排序方式: 共有205条查询结果,搜索用时 15 毫秒
71.
Melilotus Thyssen Beatriz Beker Dilek Ediger Doruk Yilmaz Nicole Garcia Michel Denis 《Environmental monitoring and assessment》2011,172(1-4):1-16
Present study was conducted in rapidly growing city Islamabad, and surface soils were collected from three major land cover types viz., built-up, drain side, and green areas. A total of seven physicochemical parameters and 11 metals were determined in surface soils. Factor analysis based on principal component analysis explained total variance of 68.0%, 64.5%, and 60.2% of three land cover types and showed high loadings for major elements (Mg and K) in built-up and green area and Fe in drain side. Top soil pollution index was carried out by using geo-accumulation index and metal pollution index (MPI6). Concentration of major elements (Ca, Mg, Na, K) in surface soils is derived by parent material, whereas concentration of Fe, Ni, Pb, and Zn were mainly related with anthropogenic sources. Geostatistical methods such as kirging identified hotspot areas of metal contamination by Pb, Ni, and Zn in built-up areas influenced mainly by vehicular emissions and waste disposal. The results stresses that land clearing should be avoided to reduce contamination and management of urban soils. 相似文献
72.
Pascal Godefroit Lina Golovneva Sergei Shchepetov Géraldine Garcia Pavel Alekseev 《Die Naturwissenschaften》2009,96(4):495-501
A latest Cretaceous (68 to 65 million years ago) vertebrate microfossil assemblage discovered at Kakanaut in northeastern
Russia reveals that dinosaurs were still highly diversified in Arctic regions just before the Cretaceous–Tertiary mass extinction
event. Dinosaur eggshell fragments, belonging to hadrosaurids and non-avian theropods, indicate that at least several latest
Cretaceous dinosaur taxa could reproduce in polar region and were probably year-round residents of high latitudes. Palaeobotanical
data suggest that these polar dinosaurs lived in a temperate climate (mean annual temperature about 10°C), but the climate
was apparently too cold for amphibians and ectothermic reptiles. The high diversity of Late Maastrichtian dinosaurs in high
latitudes, where ectotherms are absent, strongly questions hypotheses according to which dinosaur extinction was a result
of temperature decline, caused or not by the Chicxulub impact. 相似文献
73.
Kocbek Eva Garcia Hector A. Hooijmans Christine M. Mijatović Ivan Al-Addous Mohammad Dalala Zakariya Brdjanovic Damir 《Environmental science and pollution research international》2022,29(28):42016-42036
Environmental Science and Pollution Research - The provision of effective sanitation strategies has a significant impact on public health. However, the treatment of septic sludge still presents... 相似文献
74.
Almeida Aleska Kaufmann de Almeida Isabel Kaufmann Guarienti José Antonio Gabas Sandra Garcia 《Environmental science and pollution research international》2022,29(6):8126-8172
Environmental Science and Pollution Research - The time of concentration (Tc) is the main hydrological parameter used to characterize the response of a given Hydrological Response Unit (HRU) to a... 相似文献
75.
The possibility of riboflavin sensitized photo‐oxidation of polychlorinated pesticides was investigated. The dye proved to be an inefficient sensitizer for that purpose, when irradiated with visible light, in aereated aqueous solutions. A quenching of singlet and triplet excited states of the chromophore (depending on the concentrations of the quencher) is responsible for this failure in the photo‐degradation of the pesticides, which resulted easily oxidizable, via singlet oxygen mechanism, when proflavine was employed as a sensitizer. Parallel, and as a direct consequence, the rate of aerobic riboflavin photobleaching decreased drastically in the presence of the chlorophenols. The implication of our results on the inhibition of riboflavin degradation by the presence of chlorinated phenolic pesticides in the environment, is discussed, from the point of view of a kinetic and mechanistic study. 相似文献
76.
Journal of Polymers and the Environment - Coffee is a widely enjoyed beverage and one of the world’s most traded commodities. However, it also generates large amounts of bio-based waste... 相似文献
77.
Kodagu district produces 2% of the world’s coffee, in complex, multistoried agroforestry systems. The forests of the district
harbour a large population of the Asian elephant (Elephas maximus). The combined effects of high elephant density and major landscape changes due to the expansion of coffee cultivation are
the cause of human–elephant conflicts (HEC). Mitigation strategies, including electric fences and compensation schemes implemented
by the Forest Department have met with limited success. Building on previous studies in the area, we assessed current spatial
and temporal trends of conflict, analysed local stakeholders’ perceptions and identified factors driving elephants into the
estates. Our study, initiated in May 2007, shows that the intensity of HEC has increased over the last 10 years, exhibiting
new seasonal patterns. Conflict maps and the lack of correlation between physical features of the coffee plantations and elephant
visits suggest elephants move along corridors between the eastern and western forests of the district, opportunistically foraging
when crossing the plantations. Dung analyses indicate elephants have selectively included ripe coffee berries in their diet.
This is, to our knowledge, the first report of wild elephants feeding on coffee berries. If this new behaviour spreads through
the population, it will compound an already severe conflict situation. The behavioural plasticity, the multiplicity of stakeholders
involved, the difficulty in defining the problem and the limits of technical solutions already proposed suggest that HEC in
Kodagu has the ingredients of a “wicked” problem whose resolution will require more shared understanding and problem solving
work amongst the stakeholders. 相似文献
78.
79.
Humberto V. Fajardo Elson Longo Daniela Z. Mezalira Giselle B. Nuernberg Gizelle I. Almerindo André Collasiol Luiz F. D. Probst Irene T. S. Garcia Neftalí L. V. Carreño 《Environmental Chemistry Letters》2010,8(1):79-85
Al2O3, MgO, SiO2 and ZnO-supported nickel catalysts were prepared and evaluated in the ethanol steam reforming for hydrogen production. It
is shown that the catalytic behavior can be influenced depending on the experimental conditions employed and chemical composition
of the catalyst. 相似文献
80.
Dennis Ojima Luis Garcia E. Elgaali Kathleen Miller Timothy G. F. Kittel Jill Lackett 《Journal of the American Water Resources Association》1999,35(6):1443-1454
ABSTRACT: This paper reports on the current assessment of climate impacts on water resources, including aquatic ecosystems, agricultural demands, and water management, in the U.S. Great Plains. Climate change in the region may have profound effects on agricultural users, aquatic ecosystems, and urban and industrial users alike. In the central Great Plains Region, the potential impacts of climate changes include changes in winter snowfall and snow-melt, growing season rainfall amounts and intensities, minimum winter temperature, and summer time average temperature. Specifically, results from general circulation models indicate that both annual average temperatures and total annual precipitation will increase over the region. However, the seasonal patterns are not uniform. The combined effect of these changes in weather patterns and average seasonal climate will affect numerous sectors critical to the economic, social and ecological welfare of this region. Research is needed to better address the current competition among the water needs of agriculture, urban and industrial uses, and natural ecosystems, and then to look at potential changes. These diverse demands on water needs in this region compound the difficulty in managing water use and projecting the impact of climate changes among the various critical sectors in this region. 相似文献