Fokker Planck Equation
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Modelos estocásticos para tratamento da dispersão de material particulado na atmosfera / Stochastic models for the treatment of dispersion in the atmosphere
Modelos Lagrangianos estocásticos constituem ferramenta muito utilizada no estudo da dispersão de substâncias passivas na Camada Limite Atmosférica. Sua aplicação consiste em calcular a trajetória de milhares de partículas, que simulam numericamente a dispersão de uma substância em suspensão na atmosfera. Nesta tese, são apresentados e discutidos
Publicado em: 2006
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14. Efficiency of LH+EC current drive in tokamaks featuring an internal transport barrier
In the present paper we study the effects due to the occurrence of radial transport of particles in a tokamak on the efficiency of current drive due to combined action of lower hybrid waves and electron cyclotron waves, in the presence of an internal transport barrier. The results are obtained by numerical solution of the Fokker-Planck equation which rules t
Brazilian Journal of Physics. Publicado em: 2005-09
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15. Effect of radial transport on the LH current drive efficiency in tokamaks featuring an internal transport barrier
In the present paper we study the effects of occurrence of radial transport of particles in a tokamak, and the effects of the presence of an Internal Transport Barrier (ITB), on the current drive efficiency and power deposition profiles in the case of lower hybrid waves generating an extended tail in the electron distribution function. The results are obtain
Brazilian Journal of Physics. Publicado em: 2004-12
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16. Electron cyclotron emission simulation from TCABR plasmas
Electron cyclotron emission due to electrons described by a particular distribution function has been studied. The latter presents an extended tail generated by the interaction of the Lower Hybrid wave with the plasma as compared to the Maxwellian distribution function. For this purpose a new code has been developed which calculates for an arbitrary distribu
Brazilian Journal of Physics. Publicado em: 2004-12
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17. Brecha espectral na geração de corrente por onda hibrida inferior
Current drive by lower hybrid wave LH, is the most promising technique to obtain continuos current for the controlled thermonuclear fusion. The existence of "Spectral gap" forbid satisfactory match between theoretical results and experimental measurements of the generated current. The theory has always predicted smaller values. In this Thesis we show a possi
Publicado em: 1997
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18. Thermodynamics and dynamics of the formation of spherical lipid vesicles
We propose a free energy expression accounting for the formation of spherical vesicles from planar lipid membranes and derive a Fokker–Planck equation for the probability distribution describing the dynamics of vesicle formation. We find that formation may occur as an activated process for small membranes and as a transport process for sufficiently large m
Springer Netherlands.
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19. Mathematical theory of group selection: Structure of group selection in founder populations determined from convexity of the extinction operator*
Genetic analysis for group selection is developed for the case of a biallelic locus (A, a) undergoing group selection of founder populations only. By contrast to R. Levins“E = E(x) models, extinction now depends on genetics at the propagule stage but acts uniformly on larger populations. Biological evidence supports this hypothesis, which also allows mathe
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20. Theory of Mössbauer spectra of proteins fluctuating between conformational substates.
Mössbauer spectra of 57Fe in proteins fluctuating between different conformational substates are evaluated by means of a two-sided Padée approximation, which can reproduce the low and high frequency dependence of the spectral line shape I(omega) to any desired accuracy. The dynamics of the atom is modeled as Brownian motion in a multiminimum potential and