Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 09/07/2001
• Auteurs : Yann H. KerrPhilippe WaldteufelWigneron J.-P.Jordi FontMichael Berger
• Organismes : Centre d'études spatiales de la biosphère Institut Pierre-Simon-Laplace Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] European Space Research and Technology Centre

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Résumé : This paper will describe the SMOS concept in terms of instrument (characteristics) investigates the main aspects of the retrieval capabilities of the 2-D microwave interferometer for monitoring soil moisture, vegetation biomass and surface temperature. The analysis is based on model inversion taking into account the instrument characteristics. The standard error of estimate of the surface variables is computed as a function of the sensor configuration system and of the uncertainties associated with the spatial measurements. The inversion process is based on a standard minimization routine that computes both retrieved variables and standard error associated with the retrievals. The potential of SMOS, depending on the view angle configuration and the use of the sole 1.4 GHz is investigated. The analysis investigates the possibility to retrieve one, two or the three surface variables, depending on the system configuration. These questions are key issues to define the observation configuration of SMOS that meets the scientific requirements and the technical constraints of the spatial missions.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 20/06/2001
• Auteurs : Jean-Pierre FrancÉric JansonPhilippe MorelClaude RebattetMichel Riondet
• Organismes : Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] CREMHyG CREMHyG Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]

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Résumé : Visualizations of the leading edge cavity on a four-bladed inducer working with refrigerant 114 are presented. The evolution of the cavity length with the cavitation number is given for three different temperatures. These data are used to estimate the thermodynamic effect in R114. In addition, the onset of cavitation instabilities (alternate blade cavitation and rotating cavitation) are determined from the analysis of pressure fluctuations. The thermodynamic effect which affects the onset of instabilities is also estimated and compared to the one deduced from visualizations.

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Fichiers liés : b_cav2001_sessionB7.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 18/06/2001
• Auteurs : D. CordierY. LebretonMarie-José GoupilT. LejeuneJean-Philippe Beaulieu
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Astronomie du LESIA

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• Type de publi. : Communication dans un congrès
• Date de publi. : 11/06/2001
• Auteurs : Olivier BonnefoyJean-Michel HerriJean-Pierre MonfortPierre HenryPhilippe BernadaRoy Ohmura
• Organismes : Centre Sciences des Processus Industriels et Naturels Département Géochimie, environnement, écoulement, réacteurs industriels et cristallisation Laboratoire des Procédés en Milieux Granulaires Centre Sciences des Processus Industriels et Naturels Département Géochimie, environnement, écoulement, réacteurs industriels et cristallisation Laboratoire des Procédés en Milieux Granulaires Laboratoire de Génie Chimique Département de Géologie Laboratoire de Génie Electrique Department of Mechanical Engineering

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Résumé : In this paper, we give a short presentation of the project ForDiMHyS which consists of experimental studies and model establishment (or development) of the kinetics of FORmation and Dissociation of Methane Hydrates in Sediments. We focus on the details of the experimental set-up which is newly, specially designed for this study in the preliminary step of the project. The four French academic teams and two PhD thesis are involved in the ForDiMHyS project on the period 2000-2004. The financial support is given by the five French Partners. The project consists of two-step programs; firstly the data acquisition from the laboratory experimental set-up and secondly simulation of methane production from methane hydrate fields.

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Fichiers liés : JMH-EAGE-Orig.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 05/06/2001
• Auteurs : Franck NalletDominique PlansonPhilippe GodignonMarie-Laure LocatelliMihai LazarJean-Pierre Chante
• Organismes : Centre de génie électrique de Lyon Institut National des Sciences Appliquées de Lyon Centre de génie électrique de Lyon Institut National des Sciences Appliquées de Lyon Centro Nacional de Microelectronica [Spain] Centre de génie électrique de Lyon Institut National des Sciences Appliquées de Lyon Centre de génie électrique de Lyon Institut National des Sciences Appliquées de Lyon Centre de génie électrique de Lyon Institut National des Sciences Appliquées de Lyon

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Résumé : Some new device structures are developed to take advantage of the superiority of silicon carbide over silicon for high voltage and high temperature conditions. That’s the case of the JBS rectifier (junction barrier Schottky) and the VJFET (vertical junction field effect transistor) who exhibit very interesting characteristics: JBS with low voltage drop (1V) and high breakdown voltage (2.5 kV), and VJFET with a RON close to 15 m.cm² and VBR=1800V. The aim of this paper is to show the first experimental results of our 4H-SiC current limiting device. This device limits the current which flows through it as the bias voltage between its two contacts increases. The static curves obtained (T=300 K) show a current limitation ability with a saturation voltage ranging from 10V to 15V. The electrical device characterization shows a RON150 m.cm² and a current density of 100 A/cm² under 50V. The forward conduction is assumed by an N type implanted channel (doping species: nitrogen) over an P+ implanted layer (doping species: aluminum). The post-implantation annealing of 1700 °C/30 mn leads to a good electrical activation (80%) of the NCHANNEL/P+ layer (analyzed by C(V) and SIMS methods) and a good channel mobility (100 cm2.V-1.s-1 for a 31017 cm-3 N compensated doping concentration).

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• Type de publi. : Rapport
• Date de publi. : 01/06/2001
• Auteurs : Eddy CaronSerge ChaumetteSylvain Contassot-VivierFrédéric DesprezEric FleuryClaude GomezMaurice GoursatEmmanuel JeannotDominique LazureFrédéric LombardJean-Marc NicodLaurent PhilippeMartin QuinsonPierre RametJean RomanFranck RubiSerge SteerFrédéric SuterGil Utard
• Organismes : Laboratoire de l'Informatique du Parallélisme Algorithms and Software Architectures for Distributed and HPC Platforms Laboratoire Bordelais de Recherche en Informatique Algorithms for the Grid Algorithms and Software Architectures for Distributed and HPC Platforms Dynamic Networks : Temporal and Structural Capture Approach Institut Rhône-Alpin des systèmes complexes Methods, algorithms and software in automatic control Laboratoire Bordelais de Recherche en Informatique Parallel Large Data set in Network Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) Regularity and massive parallel computing Laboratoire Bordelais de Recherche en Informatique High-End Parallel Algorithms for Challenging Numerical Simulations High-End Parallel Algorithms for Challenging Numerical Simulations Algorithms and Programming Environnements for Parallelism Methods, algorithms and software in automatic control Parallel Large Data set in Network

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• Type de publi. : Article dans une revue
• Date de publi. : 01/06/2001
• Auteurs : Philippe BertrandJean-Luc PrigentJean-Pierre Lesne
• Organismes : Centre d'Études et de Recherche en Gestion d'Aix-Marseille
• Publié dans Finance le 22/10/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/06/2001
• Auteurs : Isabelle QuiduJean-Philippe MalkasseGilles BurelPierre Vilbé
• Organismes : Extraction et Exploitation de l'Information en Environnements Incertains Thales Underwater Systems Lab-STICC_UBO_CACS_COM Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)

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Résumé : In the context of mine warfare, detected mines can be classified from their cast shadow. A standard solution is to perform image segmentation first, and then to extract a set of features from the shape allowing classification in a final step. In this paper, we extend this procedure to a sequence of images obtained along a part of a circular trajectory of the sonar. For a given ground mine except mine with radial symmetry, cast shadow appearance generally depends on the point of view. Consequently, different features values can describe the same object. Whereas this often entails misclassification when a single view is used, we propose to use feature values computed over a sequence of images, especially its evolution, to characterise objects from multiple views. Our supervised classification scheme is based on the correlation, for each feature, between the sequence of values obtained from the unknown object and typical values related to each class.

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Fichiers liés : udt01multiviewSonar.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/06/2001
• Auteurs : Stéphane GallandFrédéric GrimaudPhilippe BeauneJean−pierre Campagne
• Organismes : Département Systèmes Multi-Agents Département Systèmes Multi-Agents Département Systèmes Multi-Agents Département Systèmes Multi-Agents

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Résumé : Nous nous situons dans le contexte de la simulation de systèmes industriels complexes et distribués en terme opérationnel, décisionnel et informationnel. Dans cet article, nous présentons au travers d'une étude de cas l'ensemble des concepts, formalismes et modèles proposés par notre approche méthodologique MaMA-S. Elle tient compte de la distribution, la modularité de la modélisation et de la simulation de systèmes industriels complexes et distribués. En plus de divers formalismes proposés, nous présentons un modèle de système multi-agents capable de réaliser la simulation.

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• Type de publi. : Article dans une revue
• Date de publi. : 24/05/2001
• Auteurs : Jérôme FaureJ.-R MarquèsVictor MalkaFrançois AmiranoffZ. NajmudinB. WaltonJean-Philippe RousseauS. RancA. SolodovP. Mora
• Organismes : Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Blackett Laboratory Blackett Laboratory Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Centre de Physique Théorique Centre de Physique Théorique
• Publié dans Physical Review E : Statistical, Nonlinear, and Soft Matter Physics [2001-2015] le 01/11/2020

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Résumé : Time resolved measurements of the growth of Raman instabilities were performed using a picosecond chirped laser pulse. It was observed experimentally that for a short laser pulse (<10 ps), forward and 30° Raman scattering occur at the back of the pulse. The growth of the instabilities was found to be independent of the sign of the chirp. In addition, a simple temporal model was developed and shows good agreement with the experimental results. This model also indicates that the plasma wave driven by forward Raman scattering is severely damped in the case of pulses longer than a few picoseconds. Damping by the modulational instability is compatible with the experimental results.

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