Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 30/07/1999
• Auteurs : M. BadilaB. TudorG. BrezeanuMarie-Laure LocatelliJean-Pierre ChanteJosé del R. MillánPhilippe GodignonA. A. LebedevViorel Banu
• Organismes : Polytechnic University of Bucharest [Romania] = Université Politehnica de Bucarest [Roumanie] = Universitatea Națională de Știință și Tehnologie Politehnica București [România] Polytechnic University of Bucharest [Romania] = Université Politehnica de Bucarest [Roumanie] = Universitatea Națională de Știință și Tehnologie Politehnica București [România] Centre de génie électrique de Lyon Centro Nacional de Microelectronica [Spain]
• Publié dans Materials Science and Engineering: B le 28/10/2020

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Résumé : Recent improvements in SiC substrate and epilayer quality have enabled the fabrication of devices with high voltage blocking capabilities. Boron compensation of a n-type base layer is often used in pn high voltage SIC diodes. In the case of large area devices, defects causing premature breakdown come into view. This paper reports 6H-SiC boron compensated (BC) pn junctions, having an experimental maximum breakdown voltage of 900 V for diodes with area up to 0.72 mm(2). The current-voltage (I-V) characteristics of the structures are modeled and characterized and comparison with similar but uncompensated junctions is made.

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• Type de publi. : Article dans une revue
• Date de publi. : 30/07/1999
• Auteurs : Laurent OttavianiMarie-Laure LocatelliDominique PlansonKarine IsoirdJean-Pierre ChanteE. MorvanPhilippe Godignon
• Organismes : Centre de génie électrique de Lyon Centre de génie électrique de Lyon Centre de génie électrique de Lyon Centre de génie électrique de Lyon
• Publié dans Materials Science and Engineering: B le 28/10/2020

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Résumé : Bipolar diodes, protected with junction termination extensions, were processed in 6H-SiC. A 5-fold aluminum implantation was carried out for the main p(+)-n junction creation, which led to the material amorphization. The recrystallization variation with the annealing temperature and duration is examined in this paper. We performed the Al implantations with apposite energy orders, in order to study their influence on the diode electrical characteristics. The increasing order led to a better forward conduction. and reverse leakage currents more important.

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• Type de publi. : Article dans une revue
• Date de publi. : 30/07/1999
• Auteurs : G. BrezeanuM. BadilaB. TudorJosé del R. MillánPhilippe GodignonJean-Pierre ChanteMarie-Laure LocatelliA. A. LebedevViorel Banu
• Organismes : Polytechnic University of Bucharest [Romania] = Université Politehnica de Bucarest [Roumanie] = Universitatea Națională de Știință și Tehnologie Politehnica București [România] Centre de génie électrique de Lyon Centre de génie électrique de Lyon
• Publié dans Materials Science and Engineering: B le 28/10/2020

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Résumé : This paper reports a parameter extraction method based on a new model for the high frequency capacitance-voltage (C(V)) characteristics of 6H-SiC boron compensated junctions. The C(V) model confirms the presence of two type regions (p(-) and n(-)) in the quasi-intrinsic layer induced by boron compensation. The extracted values of the net doping of these zones (6-10 x 10(12) cm(-3)) are in good agreement with previously reported data. In contrast, the thickness of the quasi-intrinsic layer, which is about twice the epilayer's width, proves the expansion of the quasi-intrinsic region in the substrate.

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• Type de publi. : Article dans une revue
• Date de publi. : 03/05/1999
• Auteurs : Olivier HagollePhilippe GoloubPierre-Yves DeschampsHélène CosnefroyXavier BriottetThierry BailleulJean-Marc NicolasFrédéric ParolB. LafranceMaurice Herman
• Organismes : Centre d'études spatiales de la biosphère Centre National d'Études Spatiales [Toulouse] Interactions Aérosols Rayonnement Laboratoire d’Optique Atmosphérique - UMR 8518 Centre National d'Études Spatiales [Toulouse] ONERA - The French Aerospace Lab [Meudon] ONERA - The French Aerospace Lab [Châtillon] Laboratoire d’Optique Atmosphérique - UMR 8518 Laboratoire d’Optique Atmosphérique - UMR 8518 Interactions Rayonnement Nuages Centre d'études spatiales de la biosphère Laboratoire d’Optique Atmosphérique - UMR 8518
• Publié dans IEEE Transactions on Geoscience and Remote Sensing le 31/10/2020

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Résumé : POLDER is a CNES instrument on board NASDA's ADEOS polar orbiting satellite, which was successfully launched in August 1996. On October 30, 1996, POLDER entered its nominal acquisition phase and worked perfectly until ADEOS's early end of service on June 30, 1997. POLDER is a multispectral imaging radiometer/polarimeter designed to collect global and repetitive observations of the solar radiation reflected by the Earth/atmosphere system, with a wide field of view (2400 km) and a moderate geometric resolution (6 km). The instrument concept is based on telecentric optics, on a rotating wheel carrying 15 spectral filters and polarizers, and on a bidimensional charge coupled device (CCD) detector array. In addition to the classical measurement and mapping characteristics of a narrow-band imaging radiometer, POLDER has a unique ability to measure polarized reflectances using three polarizers (for three of its eight spectral bands, 443 to 910 nm) and to observe target reflectances from 13 different viewing directions during a single satellite pass. One of POLDER's original features is that its in-flight radiometric calibration does not rely on any on-board device. Many calibration methods using well-characterized calibration targets have been developed to achieve a very high calibration accuracy. This paper presents the various methods implemented in the in-flight calibration plan and the results obtained during the instrument calibration phase: absolute calibration over molecular scattering, interband calibration over sunglint and clouds, multiangular calibration over deserts and clouds, intercalibration with Ocean Color and Temperature Scanner (OCTS), and water vapor channels calibration over sunglint using meteorological analysis. A brief description of the algorithm and of the performances of each method is given

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Fichiers liés : 00763266.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 03/05/1999
• Auteurs : Frédéric ParolJean-Claude BuriezClaudine VanbaucePierre CouvertGeneviève SèzePhilippe GoloubSylvain Cheinet
• Organismes : Interactions Rayonnement Nuages Laboratoire d’Optique Atmosphérique - UMR 8518 Interactions Rayonnement Nuages Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Chimie Atmosphérique Expérimentale Laboratoire de Météorologie Dynamique (UMR 8539) Interactions Aérosols Rayonnement Institut Saint-Louis (ISL)
• Publié dans IEEE Transactions on Geoscience and Remote Sensing le 31/10/2020

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Résumé : The POLDER instrument is devoted to global observations of the solar radiation reflected by the Earth-atmosphere system. Algorithms of the "Earth Radiation Budget and Clouds" processing line implemented at the French Space Center are applied to ADEOS-POLDER data. First results on derived cloud properties are presented from POLDER level 2 data of 10 November 1996 and level 3 products of June 1997. A good correlation is observed between the POLDER cloud detection algorithm and the Dynamical Clustering Method applied to METEOSAT data. The multidirectional capability of POLDER appears useful to check schemes of cloud optical thickness retrieval. As expected, a water droplet model is suitable for liquid water clouds and inadequate for ice clouds. That indirectly validates the algorithm of cloud phase recognition. An apparent pressure is derived from O2-absorption measurements and a Rayleigh cloud pressure from polarization observations. For overcast conditions, the apparent pressure is larger (by more than 100 hPa) than the Rayleigh pressure chiefly due to the photon penetration effect. For partly cloudy conditions, it can be larger or weaker depending on the surface reflectivity. Preliminary comparisons between POLDER and ISCCP monthly mean products outline some differences resulting in part from the original characteristics of POLDER

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Fichiers liés : 00763273.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/05/1999
• Auteurs : Jason HattonFrancois GaubertMarian LewisYann DarselPhilippe OhlmannJean‐pierre CazenaveDidier Schmitt
• Organismes : Biologie et pharmacologie de l'hémostase et de la thrombose Biologie et pathologie digestive Département Immunologie [CHU Toulouse] Biologie et pharmacologie de l'hémostase et de la thrombose Biologie et pharmacologie de l'hémostase et de la thrombose Biologie et pharmacologie de l'hémostase et de la thrombose
• Publié dans FASEB Journal le 25/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 15/04/1999
• Auteurs : Bernard GilPierre LefebvreJacques AllègreHenry MathieuNicolas GrandjeanMathieu LerouxJeans MassiesPierre BigenwaldPhilippe Christol
• Organismes : Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Centre de recherche sur l'hétéroepitaxie et ses applications Centre de recherche sur l'hétéroepitaxie et ses applications Centre de recherche sur l'hétéroepitaxie et ses applications Avignon Université Avignon Université
• Publié dans Physical Review B: Condensed Matter and Materials Physics (1998-2015) le 02/11/2020

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Résumé : The 2-K recombination dynamics of coupled GaN-AlGaN multiple quantum wells reveals a composite nature in terms of the joint contributions of short-lived direct excitons and long-lived oblique ones. The possibility to observe these oblique excitons, which produce a unusual blueshift of the photoluminescence at long decay times is found to be in straightforward correlation with the presence of internal electric fields together with the existence of a slight disorder at the monolayer scale.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 07/04/1999
• Auteurs : Jean-Michel VallatPhilippe CouratierPierre-Marie PreuxF DeviereP de LiegeDominique Cros
• Organismes : Centre de référence national neuropathies périphériques rares [CHU Limoges] Service de Neurologie [CHU Limoges] Neuroépidémiologie Tropicale et Comparée Service de Neurologie [CHU Limoges] Service de Neurologie [CHU Limoges] Neuroépidémiologie Tropicale et Comparée Service de l'Information Médicale et de l'Évaluation [CHU Limoges] Laboratoire de Biostatistique et d'Informatique Médicale

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• Type de publi. : Article dans une revue
• Date de publi. : 01/04/1999
• Auteurs : Sandrine TheriasChristine MoustyPierre PalvadeauPhilippe MoliniePhilippe LeoneJean RouxelChristine Taviot-GuehoAbderrahman EnnaquiAndré de RoyPierre Besse
• Organismes : Institut de Chimie de Clermont-Ferrand Institut de Chimie de Clermont-Ferrand Institut des Matériaux Jean Rouxel Supélec Sciences des Systèmes Laboratoire de Chimie du Solide Institut de Chimie de Clermont-Ferrand Institut de Chimie de Clermont-Ferrand
• Publié dans Journal of Solid State Chemistry le 26/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/03/1999
• Auteurs : Éric DouvillePhilippe BienvenuJean Luc CharlouJean Pierre DonvalYves FouquetPierre AppriouToshitaka Gamo
• Organismes : Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] Géochrononologie Traceurs Archéométrie CEA Cadarache Unité Géosciences Marines
• Publié dans Geochimica et Cosmochimica Acta le 25/10/2020

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