PubMed Health⌕ Search

Biomedical subjects

E Brener

Publications and source records attributed to E Brener.

18 recordsLinked to original sources
PubMed2001

Epitaxial growth with elastic interaction: submonolayer island formation.

A model for island formation in submonolayer epitaxy has been studied in the presence of elastic strain by means of a Monte Carlo simulation. The description, based on rate equations, leads to scaling predictions for cluster statistics and diffusion rates. We generalize these predictions to include the effects of the repulsive elastic interaction. The elastic interaction is caused by the deformation of the underlying substrate and has a repulsive 1/r(3) character. To enable the efficient simulation of multiparticle surface diffusion with long-range interaction, we employ a multigrid scheme. One particular result is that, with increasing elastic repulsion between the adsorbed particles, the formation of islands is hampered, and island nucleation is deferred to higher coverage values.

Journal Article↗
PubMed2001

Dewetting hydrodynamics in 1+1 dimensions.

A model for the phase transition between partial wetting and dewetting of a substrate has been formulated that explicitly incorporates the hydrodynamic flow during the dewetting process in 1+1 dimensions. The model simulates a fluid layer of finite thickness on a substrate in coexistence with a dry part of the substrate and a gas phase above the substrate. Under nonequilibrium "dewetting" conditions, the front between the dry part and the wet part of the surface moves towards the wet part inducing hydrodynamic flow inside the wet layer. In more general terms, the model handles two immiscible fluids with a freely movable interface in an inhomogeneous external force field. Handling the interface by a new variant of the phase-field model, we obtain an efficient code with well-defined interfacial properties. In particular, the (free) energy can be chosen at will. We demonstrate that our model works well in the viscosity range of creeping flow and we give qualitative results for the higher Reynolds numbers. Connections to experimental realizations are discussed.

Journal Article↗
PubMed1999

Fractal growth of epitaxial surface clusters with elastic interaction.

The fractal growth of clusters adsorbed on crystal surfaces has been studied by Monte Carlo simulations. Elastic interactions between the atoms through the substrate have been included. Attractive and repulsive interaction potentials 1/r(3) have been used, including a varying cutoff for the range of interaction. As an important result we find that there exists a crossover radius beyond which the fractal dimension of the cluster corresponds to the fractal dimension of conventional two-dimensional diffusion limited aggregation. The crossover radius itself and the properties of the cluster inside that radius depend sensitively on the details of the interaction. The results have been analyzed by a scaling theory. Furthermore, we have implemented a multigrid scheme which allows for very efficient simulation of a large number of mobile atoms with long-range interaction on the surface.

Journal Article↗
PubMedDate not supplied

[2 cases of hemolytic complications during intermittent treatment with rifampicin].

Two cases are presented, of hemolytic jaundice, determined by rifampicin. The first occured in a woman in whom treatment was started again after an interruption of 6 months and the second in a man undergoing intermittent treatment that had been tolerated very well for 3 months. Following the extension of the application of rifampicin in intermittent treatment might occur more frequently. Posology apparently has a major role and some precautions are to be taken.

Adult↗