Buscar
Mostrando ítems 11-20 de 52
Artículo
One‐dimensional models for slender axisymmetric viscous liquid bridges
(American Institute of Physics, 1996-11)
A set of one‐dimensional models, previously derived for liquid jets, is generalized to viscous liquid bridges by applying suitably modified boundary conditions at the anchoring disks. A linear analysis for small‐amplitude ...
Artículo
Three-dimensional modelling of the tide-induced dispersion of radionuclides in the sea
(Elsevier, 1998)
A three-dimensional marine dispersion model for radionuclides has been developed. ¹he model solves the three-dimensional hydrodynamic equations and, simultaneously, the three-dimensional advective—diffusive dispersion ...
Artículo
Soil to plant transfer of 226 Ra in a marsh area: Modelling application
(Elsevier, 1998)
¹he Odiel river forms an estuarine system which surrounds a large marsh area. A phosphate fertilizer processing complex releases its wastes into the estuary. ¹he presence of 226Ra in soils and plants (Spartina Densiflora) ...
Artículo
Intersection of crisis loci in a driven nonlinearly damped oscillator
(Elsevier, 1995)
We report on a phenomenon observed in a driven nonlinearly damped oscillator when two control parameters, the frequency of the external excitation and the nonlinear damping coefficient, are varied simultaneously. An interior ...
Artículo
U and Th speciation in river sediments
(Elsevier, 1995)
A study of the distribution of some natural radionuclides in different chemical fractions of river bottom sediments has been carried out. The study has shown that the majority of the total U in sediments is located in the ...
Artículo
Uranium and thorium concentrations in an estuary affected by phosphate fertilizer processing: Experimental results and a modelling study
(Elsevier, 1997)
The Odiel river, in southwest Spain, forms an estuarine system which is affected by waste disposal from a fertilizer complex. Uranium and thorium concentrations in waters and suspended matter, activity ratios and distribution ...
Artículo
Diffusion in a class of exactly solvable non-harmonic potentials. Intrinsic effects induced by non-linearities
(Elsevier, 1990)
This paper deals with the problem of a particle that diffuses in a potential with a reflecting barrier and has a point of stable equilibrium and a point of unstable equilibrium. Based on the exact solutions obtained earlier ...
Artículo
Low-level radioactivity studies in the marine environment of the South of Spain
(Elsevier, 1992)
In this paper preliminary levels of natural and man-made radionuclides in the South Spanish marine environment are presented. Local man-made sources are found to be the main contributors to the natural environmental ...
Artículo
U- and Th-isotopes in an estuarine system in southwest Spain: Tidal and seasonal variations
(Elsevier, 1996)
The presence of U- and Th-isotopes in suspended matter from an estuarine system which surrounds a phosphate fertilizer processing complex has been investigated. A clear radioactive impact from the complex has been confirmed ...
Artículo
Dynamics of slender viscous dielectric liquid bridges subjected to axial AC fields
(ScienceDirect, 1997-12)
An analysis of slender axisymmetric liquid bridges is performed on the basis of one-dimensional models recently derived, and generalized here to include the effect of dielectric forces at the interface. The natural frequencies ...