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Mostrando ítems 11-18 de 18
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
Application of a liquid scintillation counter to the measurement of tracing radioactivity in experiments on suspended matter uptake in aquatic environments
(E. D. P. Sciences, 2002)
The experiments on the study of the kinetic transfer coefficients of conservative and non-conservative radionuclides, in aquatic environments, need to determine radionuclide activity in large number of samples. Different ...
Artículo
Experimental and modelling study of artificial radionuclides (239Pu, 241Am and 99Tc) uptake by suspended matter in environmental waters located in the south of Spain
(E. D. P. Sciences, 2002)
The interest on transfer coefficients studies have increased recently, since they are important parameters required understanding and reliably modelling the dispersion of conservative and non-conservative radionuclides in ...
Artículo
A particle-tracking method for simulating the dispersion of non-conservative radionuclides in coastal waters
(Elsevier, 2002)
A particle-tracking method has been used to simulate the dispersion of non-conservative radionuclides in the sea. Three dimensional turbulent diffusion and the interactions between water, suspended matter and bottom sediments ...
Artículo
The design of an electrostatic variable energy positron beam for studies of defects in ceramic coatings and polymer films
(ScienceDirect, 2002-06-22)
An electrostatic variable energy positron beam for studying defects in ceramic coatings, polymer films and MOS-devices is developed for operation in Doppler-broadening (DB) and positron annihilation lifetime (PAL) modes. ...
Artículo
Moving breathers in a DNA model with competing short and long range dispersive interactions
(2002)
Moving breathers is a means of transmitting information in DNA. We study the existence and properties of moving breathers in a DNA model with short range interaction, due to the stacking of the base pairs, and long range ...
Artículo
The enhancement of Ra-226 in a tidal estuary due to the overation of fertilizer factories and redissolution from sediments: Experimental results and a modelling study
(Elsevier, 2002)
The presence of 226Ra in a tidal estuary formerly affected by direct discharges from a phosphate fertilizer complex has been investigated. In general, activity levels are lower than those detected when direct discharges ...
Artículo
Radioactive impact in sediments from an estuarine system affected by industrial wastes releases
(Elsevier, 2002)
A big fertilizer industrial complex and a vast extension of phosphogypsum piles (12 km2), sited in the estuary formed by the Odiel and Tinto river mouths (southwest of Spain), are producing an unambiguous radioactive ...