34 resultados para Expansion du cumulus

em DI-fusion - The institutional repository of Université Libre de Bruxelles


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Publication d'un papyrus inédit de la collection de Duke University contenant un extrait du Psaume 90 en copte; le papyrus a probablement servi d'amulette

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Présentation de l'organisation du monastère de Baouît, à travers notamment la documentation écrite.

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Publication des peintures et inscriptions des murs nord et est du narthex de l'église rupestre du Deir Abou Hennis

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Edition d'un proscynème grec inédit (époque impériale) et réédition d'une inscription copte, déjà publiée comme un texte grec (I.Lefebvre 551).

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A supersonic expansion containing acetylene seeded into Ar and produced from a circular nozzle is investigated using CW/cavity ring down spectroscopy, in the 1.5 μm range. The results, also involving experiments with pure acetylene and acetylene-He expansions, as well as slit nozzles, demonstrate that the denser central section in the expansion is slightly heated by the formation of acetylene aggregates, resulting into a dip in the monomer absorption line profiles. Acetylene-Ar aggregates are also formed at the edge of the circular nozzle expansion cone. © 2008 Elsevier B.V. All rights reserved.

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The hydrodynamic structure of an axisymmetric supersonic expansion can be regarded as a series of concentric divergent cones, with decreasing particle densities as the cone angle increases. Different groups of molecules therefore contribute to high-resolution absorption line shapes when optically probing the expansion in a direction perpendicular to the jet axis. These groups are distinguished by the cone angle, inducing a specific Doppler shift, and by the particle density, contributing a specific weight to the absorption intensity. As a result different broader line profiles are observed compared to room temperature spectra. This effect is investigated here selecting as the working example the R(0), ν3 absorption line in N2O recorded using a Fourier transform interferometer. Independent impact pressure and quadrupole mass spectrometric measurements are performed leading to two complementary maps of the expansion, allowing the recorded absorption line shape to be quantitatively modeled. © 2006 Elsevier Ltd. All rights reserved.

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Paris