968 resultados para asymptotic suboptimality


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A horizontal fluid layer heated from below in the presence of a vertical magnetic field is considered. A simple asymptotic analysis is presented which demonstrates that a convection mode attached to the side walls of the layer sets in at Rayleigh numbers much below those required for the onset of convection in the bulk of the layer. The analysis complements an earlier analysis by Houchens [J. Fluid Mech. 469, 189 (2002)] which derived expressions for the critical Rayleigh number for the onset of convection in a vertical cylinder with an axial magnetic field in the cases of two aspect ratios. © 2008 American Institute of Physics.

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This work was presented in part at the 8th International Conference on Finite Fields and Applications Fq^8 , Melbourne, Australia, 9-13 July, 2007.

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This project was partially supported by RFBR, grants 99-01-00233, 98-01-01020 and 00-15-96128.

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2000 Mathematics Subject Classification: 35J05, 35C15, 44P05

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Mathematics Subject Classification: 45G10, 45M99, 47H09

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2000 Mathematics Subject Classification: 60J80.

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Л. И. Каранджулов, Н. Д. Сиракова - В работата се прилага методът на Поанкаре за решаване на почти регулярни нелинейни гранични задачи при общи гранични условия. Предполага се, че диференциалната система съдържа сингулярна функция по отношение на малкия параметър. При определени условия се доказва асимптотичност на решението на поставената задача.

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AMS subject classification: 60J80, 62F12, 62P10.

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2000 Mathematics Subject Classification: 60J80.

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2010 Mathematics Subject Classification: 62F12, 62M05, 62M09, 62M10, 60G42.

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2000 Mathematics Subject Classification: 35J70, 35P15.

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MSC 2010: 33E12, 30A10, 30D15, 30E15

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2000 Mathematics Subject Classification: 35Q02, 35Q05, 35Q10, 35B40.

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2000 Mathematics Subject Classification: 37D40.