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Mostrando ítems 31-40 de 52
Artículo
Modelling the Distribution of Radionuclides in Deep Ocean Water Columns. Application to 3H, 13 Cs and 239, 246Pu
(Elsevier, 1998)
A one-dimensional model to simulate the dispersion of radionuclides down deep water columns has been developed. The model includes the transfers of radionuclides between water, suspended matter and bottom sediments. Such ...
Artículo
Anthropogenic contamination analyzed by TTPIXE in samples from the Odiel salt marsh at the SW Spain
(Springer, 1997)
The studied marsh area is located at the southwest of Spain in an estuarine system formed by the confluence of the Odiel river and the Atlantic ocean. 23 samples collected in the marsh have been analysed by Thick Target ...
Artículo
Enhanced U and Th concentrations in soils from a wet marshland washed by contaminated riverwaters
(Elsevier, 1996)
A study of the presence of U and Th isotopes in soil samples from a saline wet Marshland located close to a phosphoric acid production factory is presented. The samples were collected during low tide in areas washed by ...
Artículo
Lie symmetries and multiple solutions in lambda-omega reaction-diffusion systems
(IOP, 1997)
Lie theory of transformation groups is applied to the study of lambda-omega reaction-diffusion systems in two-dimensional media. Our study proves that they are invariant with respect to a five-parameter symmetry group. ...
Artículo
The distribution of U, Th and 226Ra derived from the phosphate fertilizer industries on an estuarine system in Southwest Spain
(Elsevier, 1994)
This paper reports an extensive study of the presence of natural radioactivity around a phosphate fertilizer factory complex situated in an estuarine area of southwest Spain. The study has concluded that the wastes from ...
Artículo
Overdamped sine-Gordon kink in a thermal bath
(1999)
We study sine-Gordon kink diffusion at finite temperature in the overdamped limit. By means of a general perturbative approach, we calculate the first- and second-order ~ in temperature ! contributions to the ...
Artículo
210Pb enhancement in rivers affected by the phosphate rock processing in southwestern Spain
(Elsevier, 1997)
The activity levels of 210Pb in solution and bottom sediments were measured in the estuary formed by the Odiel and Tinto rivers in southwest Spain. The levels in both water and sediment samples indicate that the discharges ...
Artículo
A three dimensional σ-coordinate model to simulate the dispersion of radionuclides in the marine environment: application to the Irish Sea
(Elsevier, 1998)
A three dimensional model to simulate the tide induced dispersion of radionuclides in the sea has been developed. The model uses normalized σ-coordinates in the vertical so that resolution is not reduced in the shallower ...
Artículo
Transfer of natural radionuclides from soils to plants in a marsh enhanced by the operation of non-nuclear industries
(Elsevier, 1997)
Two sampling campaigns were performed in 1993 at the marsh area (Odiel marsh) located in southwestern Spain, in the city of Huelva. Spartina densiflora and substrate soil (5 cm deep) samples were collected in several ...
Artículo
Steady state of a fluidized granular medium between two walls at the same temperature
(American Physical Society, 1998)
The steady state of a low-density gas of inelastic hard spheres confined between two parallel walls at the same temperature is studied. Because of the dissipation in collisions, the state is not uniform but highly inhomogeneous ...