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Mostrando ítems 21-30 de 48
Artículo
On the sensitivity of a marine dispersion model to parameters describing the transfers of radionuclides between the liquid and solid phases
(Elsevier, 2004)
The sensitivity of a marine dispersion model for non-conservative radionuclides, pre viously developed and validated for the English Channel, to parameters describing the exchanges between the liquid and solid phases ...
Artículo
Demonstration of the stability or instability of multibreathers at low coupling
(2003)
Whereas there exists a mathematical proof for one-site breathers stability, and an unpublished one for two-site breathers, the methods for determining the stability properties of multibreathers rely on numerical computation ...
Artículo
Modelling the tidal dispersion of 137 Cs and 239,240 Pu in the English Channel
(Elsevier, 2000)
A numerical model to simulate the tidal dispersion of non-conservative radionuclides in the English Channel has been developed. The model solves the shallow water hydrodynamic equations and, simultaneously, the suspended ...
Artículo
Inhomogeneous multiscale dynamics in harmonic lattices
(American Institute of Physics, 2005)
We use projection operators to address the coarse-grained multiscale problem in harmonic systems. Stochastic equations of motion for the coarse-grained variables with an inhomogeneous level of coarse graining in both time ...
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
Numerical study of breathers in a bent chain of oscillators with long-range interaction
(IOP Science, 2001)
Most of the studies of breathers in networks of oscillators are limited to nextneighbour interaction. However, long-range interaction becomes critical when the geometry of the chain is taken into account, as the distance ...
Artículo
Breathers in a system with helicity and dipole interaction
(American Physical Society, 2002)
Recent papers that have studied variants of the Peyrard-Bishop model for DNA, have taken into account the long range interaction due to the dipole moments of the hydrogen bonds between base pairs. In these models the ...
Artículo
Testing the behaviour of different kinetic models for uptake/release of radionuclides between water and sediments when implemented in a marine dispersion model
(Elsevier, 2004)
Three kinetic models for adsorption/release of 137Cs between water and sediments have been tested when they are included in a previously validated dispersion model of the English Channel. Radionuclides are released to the ...
Artículo
Neotectonics and shoreline history of the Rock of Gibraltar, southern Iberia
(Elsevier, 2004)
Several sets of staircased Quaternary marine deposits can be observed along the Gibraltar coast ranging from 1 to 210 m above the present mean sea level. Geomorphological mapping establishes, from the relationship between ...
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 ...