Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.00 vteřin. 
Ostwald ripening – theoretical description and simulation.
Čechal, Tomáš ; Šikola, Tomáš (oponent) ; Čechal, Jan (vedoucí práce)
This thesis deals with Ostwald ripening of three-dimensional clusters deposited on a two-dimensional surface. In the first chapter two distinct theories of Ostwald ripening are presented: the mean-field LSW theory and a many-body theory based on the solution of the diffusion equation in quasistationary approximation. In second chapter the algorithm used for numerical solution of the equations obtained from the many-body theory is described. The results extracted from the numerical solution are compared with predictions of the LSW model in the third chapter. We found that the standard LSW theory of systems with two-dimensional mass transport should not be used in practice because its predictions are in strong disagreement with the results obtained both from the more elaborate diffusion-equation model and from experimental studies described in references. On the other hand, the diffusion equation based model gives results consistent with other theories and experiments.
Ostwald ripening – theoretical description and simulation.
Čechal, Tomáš ; Šikola, Tomáš (oponent) ; Čechal, Jan (vedoucí práce)
This thesis deals with Ostwald ripening of three-dimensional clusters deposited on a two-dimensional surface. In the first chapter two distinct theories of Ostwald ripening are presented: the mean-field LSW theory and a many-body theory based on the solution of the diffusion equation in quasistationary approximation. In second chapter the algorithm used for numerical solution of the equations obtained from the many-body theory is described. The results extracted from the numerical solution are compared with predictions of the LSW model in the third chapter. We found that the standard LSW theory of systems with two-dimensional mass transport should not be used in practice because its predictions are in strong disagreement with the results obtained both from the more elaborate diffusion-equation model and from experimental studies described in references. On the other hand, the diffusion equation based model gives results consistent with other theories and experiments.
Velké objekty v MOVPE strukturách s InAs/GaAs kvantovými tečkami
Samokhin, Jevgen ; Pangrác, Jiří ; Melichar, Karel ; Vavra, I. ; Jurek, Karel ; Mates, Tomáš ; Šimeček, Tomislav ; Hulicius, Eduard
Studovali jsme přítomnost velkých objektů ve vzorcích se samovolně uspořádanými kvantovými tečkami vypěstovanými technologií MOVPE. Vznik velkých objektů a velká koncentrace india uvnitř byla vysvětlena jako kombinovaný proces akumulace In atomů na povrchu a jejich následná povrchová migrace na dlouhé vzdálenosti.

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