957 resultados para Ergodicità, Ergodica, Ricorrenza, FPU, Fermi-Pasta-Ulam


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Written in one column, 9 lines per page, in black and red.

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Cream laid paper. 20 x 13 cm. (16 x 8.5 cm.).

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Osʿulamā’ exercem uma infuência sobre a comunidade, através do controlo do espaço religioso, a fim de dar a conhecer as normas do islão e garantir a sua boa aplicação. Do quadro social e cultural, onde se inserem estes sabios religiosos, abordamos o seu papel jurídico e religioso, mediante un aviso jurídico, « fatwā», na legitimação do poder. Num contexto marcado pela crise política e pela ameaça ibérica e otomana, osʿulamā’ unificam as linhas em torno do poder para melhor combater o perigo português.

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Mode of access: Internet.

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"Published January 1964."--i.

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Includes bibliographies.

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Half-title.

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Mode of access: Internet.

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2 scans - 1of2 = photo, 2of2 = key to individuals pictured

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A self-consistent theory is derived to describe the BCS-Bose-Einstein-condensate crossover for a strongly interacting Fermi gas with a Feshbach resonance. In the theory the fluctuation of the dressed molecules, consisting of both preformed Cooper pairs and bare Feshbach molecules, has been included within a self-consistent T-matrix approximation, beyond the Nozieres and Schmitt-Rink strategy considered by Ohashi and Griffin. The resulting self-consistent equations are solved numerically to investigate the normal-state properties of the crossover at various resonance widths. It is found that the superfluid transition temperature T-c increases monotonically at all widths as the effective interaction between atoms becomes more attractive. Furthermore, a residue factor Z(m) of the molecule's Green function and a complex effective mass have been determined to characterize the fraction and lifetime of Feshbach molecules at T-c. Our many-body calculations of Z(m) agree qualitatively well with recent measurments of the gas of Li-6 atoms near the broad resonance at 834 G. The crossover from narrow to broad resonances has also been studied.

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We discuss the superfluid phase transition of a strongly interacting Fermi gas with unequal ( asymmetric) chemical potentials in two pairing hyperfine states, and map out its phase diagram near the BCS-BEC crossover. Our approach includes the fluctuation contributions of preformed Cooper pairs to the thermodynamic potential at finite temperature. We show that, below a critical difference in chemical potentials between species, a normal gas is unstable towards the formation of either a finite-momentum paired Fulde-Ferrell-Larkin-Ovchinnikov superconducting phase or a uniform superfluid, depending on the asymmetry and interaction strengths. We determine the value of critical chemical potential mismatch, and find that it is consistent with a recent measurement by Zwierlein et al. ( Science, 311 ( 2006) 492).