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342 results on '"Plantier, F."'

52. Lichen plan chez des patients traités par anti-PD1 : 6 cas

Author

Lheure, C., primary, Kramkimel, N., additional, Franck, N., additional, Soria, A., additional, Polivka, L., additional, Goldman-Levy, G., additional, Plantier, F., additional, Isnard, C., additional, Seta, V., additional, Chanal, J., additional, Dupin, N., additional, Aractingi, S., additional, Goldwasser, F., additional, and Guegan, S., additional

Published
2018
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54. Analysis of the orientational order effect on n-alkanes: Evidences on experimental response functions and description using Monte Carlo molecular simulation.

Author

Bessières, D., Piñeiro, M. M., De Ferron, G., and Plantier, F.

Subjects
ALKANES, MONTE Carlo method, RAYLEIGH scattering, THERMODYNAMICS, FLUID dynamics, NUCLEAR isomers
Abstract

Short-range correlations of the molecular orientations in liquid n-alkanes have been extensively studied from depolarized Rayleigh scattering and thermodynamic measurements. These correlations between segments induce structural anisotropy in the fluid bulk. This phenomenon, which is characteristic of linear chain molecules when the constituting segments are nor freely jointed, but interact through a given angular potential, is then present in the linear n-Cn series, increasing its magnitude with chain length, and it is therefore less relevant or even completely absent in branched alkanes. This intermolecular effect is clearly revealed in second-order excess magnitudes such as heat capacities when the linear molecule is mixed with one whose structure approaches sphericity. The mixing process of different aspect ratio chain molecules is thought to modify the original pure fluid structure, by producing a diminution of the orientational order previously existing between pure n-alkane chains. However, second-order thermodynamics quantities of pure liquids CP, (∂v/∂T)P, and (∂v/∂P)P are known to be very sensitive to the specific interactions occurring at the microscopic level. In other words, the behavior of these derived properties versus temperature and pressure can be regarded as response functions of the complexity of the microscopic interactions. Thus, the purpose of the present work is to rationalize the orientational order evolution with both temperature and molecular chain length from the analysis of pure fluid properties. To this aim, we focused on two linear alkanes, n-octane (n-C8) and n-hexadecane (n-C16), and two of their branched isomers, i.e., 2,2,4-trimethylpentane (br-C8) and 2,2,4,4,6,8,8-heptamethylnonane (br-C16). For each compound, we propose a combined study from direct experimental determination of second-order derivative properties and Monte Carlo simulations. We performed density ρ, speed of sound c, and isobaric heat capacity CP measurements in broad ranges of pressure and temperature allowing a complete thermodynamic characterization of these compounds. Monte Carlo simulations provide a link between the molecular scale model and the experimental thermodynamic properties. Additional information about the microscopic structure of the simulated fluid model was derived, through the calculation of the radius of gyration and average end-to-end distances. Orientational order is clearly revealed by the experimental residual heat capacity trend of pure linear alkanes. The close agreement observed between this experimental macroscopic property and the calculated theoretical structural parameters support the conclusion that the orientational order between segments of linear molecules should be regarded as a conformational effect due to the flexibility of the chain. [ABSTRACT FROM AUTHOR]

Published
2010
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72. Étude anatomo-clinique de trente cas de carcinomes eccrines sclérosants (carcinome annexiel microkystique, carcinome syringomateux, carcinome eccrine ductal squamoïde)

Author

Frouin, E., primary, Vignon-Pennamen, M.-D., additional, Balme, B., additional, Plantier, F., additional, Cavelier-Balloy, B., additional, Zimmermann, U., additional, Clerici, T., additional, Ortonne, N., additional, Moulonguet, I., additional, Carlotti, A., additional, Moguelet, P., additional, Pinquier, L., additional, André, J., additional, Sass, U., additional, Grossin, M., additional, and Cribier, B., additional

Published
2013
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79. Réponses immunitaires T anti-E2 d’HPV16 et contrôle viral chez des femmes ayant une VIN classique et leurs partenaires masculins

Author

Jacobelli, S., primary, Sanaa, F., additional, Moyal-Barracco, M., additional, Pelisse, M., additional, Berville, S., additional, Villefroy, P., additional, North, M.-O., additional, Figueiredo, S., additional, Charmeteau, B., additional, Clerici, T., additional, Plantier, F., additional, Dupin, N., additional, Avril, M.-F., additional, Guillet, J.-G., additional, Cheynier, R., additional, and Bourgault-Villada, I., additional

Published
2011
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95. New methodology for simultaneous volumetric and calorimetric measurements: Direct determination of αp and Cp for liquids under pressure.

Author

Casás, L. M., Plantier, F., and Bessières, D.

Subjects
*VOLUME (Cubic content), *CALORIMETRY, *PHYSICAL measurements, *THERMOPHYSICAL properties, *SCIENTIFIC apparatus & instruments
Abstract

A new batch cell has been developed to measure simultaneously both isobaric thermal expansion and isobaric heat capacity from calorimetric measurements. The isobaric thermal expansion is directly proportional to the linear displacement of an inner flexible below and the heat capacity is calculated from the calorimetric signal. The apparatus used was a commercial Setaram C-80 calorimeter and together with this type of vessels can be operated up to 20 MPa and in the temperature range of 303.15–523.15 K, In this work, calibration was carried out using 1-hexanol and subsequently both thermophysical properties were determined for 3-pentanol, 3-ethyl-3-pentanol, and 1-octanol at atmospheric pressure, 5 and 10 MPa, and from 303.15 to 423.15 K in temperature. Finally experimental values were compared with the literature in order to validate this new methodology, which allows a very accurate determination of isobaric thermal expansion and isobaric heat capacity. [ABSTRACT FROM AUTHOR]

Published
2009
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96. Measurements of the Speed of Sound for Mixtures of Methane + Butane with a Particular Focus on the Critical State

Author

Plantier, F., Danesh, A., Sohrabi, M., Daridon, J.-L., Gozalpour, F., and Todd, A. C.

Abstract

The speed of sound in binary mixtures of methane + butane has been measured in the subcritical, near-critical, and supercritical regions as a function of pressure at 311 K. The measurements were based on an acoustic pulse technique using a high-pressure vessel equipped with two 1-MHz transducers to generate and receive the ultrasonic wave. The results showed that the speed of sound decreased with decreasing pressure for mixtures in the subcritical region, whereas it passed through a minimum in the supercritical region.

Published
2005

97. Nonlinear parameter (<iopmath latex="$B/A$">B/A</iopmath>) measurements in methanol, 1-butanol and 1-octanol for different pressures and temperatures

Author

Plantier, F, Daridon, J L, and Lagourette, B

Abstract

Experimental determinations versus pressure of the nonlinear acoustic parameter B/A have been conducted for methanol, 1-butanol and 1-octanol in the pressure range 0-50 MPa and temperature range 303.15-373.15 K. These measurements proceed from an experimental technique based on a phase comparison method allowing to measure the change in sound speed with the pressure for an isentropic process. The value of B/A is found to decrease with increasing pressure and seems to be an increasing function of temperature. A comparison with the data determined numerically by the classical thermodynamic method has also been performed.

Published
2002
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100. Une éruption nodulaire profuse au 21esiècle : penser à la lèpre

Author

Isnard, C., Jachiet, M., Franck, N., Plantier, F., Mougari, F., Loubet, A.-M., Fraitag-Spinner, S., Morand, P., De Clipelle, D., Charpentier, C., and Dupin, N.

Abstract

La lèpre est rare en métropole, avec moins de 20 nouveaux cas diagnostiqués par an. Nous rapportons une observation de lèpre multibacillaire (MB) lépromateuse polaire (LP) avec érythème noueux lépreux (ENL).

Published
2018
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