Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 08/07/2008
• Auteurs : Ibrahim CheddadiGraner FrançoisPhilippe MarmottantChristophe RaufastePierre Saramito
• Organismes : Modelling, Observations, Identification for Environmental Sciences Equations aux Dérivées Partielles Laboratoire de Spectrométrie Physique Laboratoire de Spectrométrie Physique Institut de Recherche sur les Phénomènes Hors Equilibre Laboratoire de Spectrométrie Physique Physique et mécanique des milieux hétérogènes Modelling, Observations, Identification for Environmental Sciences Equations aux Dérivées Partielles

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Résumé : We present a numerical simulation based on a tensorial elastoviscoplastic model that includes a viscous drag and compare it to experimental measurements on liquid foams trapped between two glass plates in a bidimensional cylindrical Couette geometry, both in stationary and transient regimes. The main features of the model are elasticity up to a plastic yield stress and viscoelasticity above. The numerical modelling bases on a small set of standard material parameters that could be fully characterised. Shear localisation as well as fine transient observations are reproduced and are found to be in good agreement with experimental measurements. The plasticity appears to be the fundamental mechanism of the localisation of the flow. The present approach can be extended from liquid foams to similar materials such as emulsions, colloids or wet granular materials that exhibit localisation.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 07/07/2008
• Auteurs : Jean-Philippe AntoniPierre FrankhauserCécile TannierSamy Youssoufi
• Organismes : Théoriser et modéliser pour aménager (UMR 6049) Théoriser et modéliser pour aménager (UMR 6049) Théoriser et modéliser pour aménager (UMR 6049) Théoriser et modéliser pour aménager (UMR 6049)

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Résumé : The first part of the paper is centered on the phenomena of urban growth, in order to set the rules for a sustainable scenario of urban development. Then we enter the core of the paper that is the comparison of models. For each of the three compared models, we describe its main theoretical characteristics, the chosen parameters, and the obtained results. In section 6, heterogeneity of the produced results is discussed, and we highlight the points of interest and the lacks of the three models. Here we show that results we obtained feed debates about urban growth management. Finally, concluding remarks at the end of the paper address the general topic of the evaluation of the quality of simulation results.

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Fichiers liés : DDSS2008-25.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 07/07/2008
• Auteurs : Benoît MosserJean-Tristan BueyClaude CatalaThierry AppourchauxStéphane CharpinetPhilippe MathiasJean-Pierre Maillard
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Astronomie du LESIA Ingénieurs, Techniciens et Administratifs Pôle Planétologie du LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Astronomie du LESIA Ingénieurs, Techniciens et Administratifs Pôle Planétologie du LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Astronomie du LESIA Ingénieurs, Techniciens et Administratifs Pôle Planétologie du LESIA

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• Type de publi. : Communication dans un congrès
• Date de publi. : 06/07/2008
• Auteurs : Kauzar Saleh ContellGilles BouletYann H. KerrPhilippe MaisongrandePhilippe RichaumeWigneron J.-P.Steven DelwartRocco PancieraJeffrey Walker
• Organismes : Department of geography Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Écologie fonctionnelle et physique de l'environnement European Space Research and Technology Centre University of Melbourne University of Melbourne

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Fichiers liés : Abstract_Saleh_IGARRS08_1.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 06/07/2008
• Auteurs : Jean-Pierre LumaretJean-Philippe DeguineEric Gozé
• Organismes : Centre d’Ecologie Fonctionnelle et Evolutive

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• Type de publi. : Communication dans un congrès
• Date de publi. : 06/07/2008
• Auteurs : Gabriel VasileJean-Philippe OvarlezFrédéric PascalCéline TisonLionel BombrunMichel GayEmmanuel Trouvé
• Organismes : GIPSA - Signal Images Physique Institut de Recherches sur les lois Fondamentales de l'Univers ONERA - The French Aerospace Lab [Toulouse] Sondra, CentraleSupélec, Université Paris-Saclay (COmUE) Centre d'études spatiales de la biosphère GIPSA - Signal Images Physique GIPSA - Signal Images Physique GIPSA-Services Érosion torrentielle, neige et avalanches GIPSA - Signal Images Physique Institut de Recherches sur les lois Fondamentales de l'Univers

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Résumé : This paper presents an application of the recent advances in the field of Spherically Invariant Random Vectors modelling. We propose the use of the Fixed Point (FP) estimator for deriving normalized polarimetric coherency matrices in compound Gaussian clutter. The main advantages of the FP estimator are that it does not require any "a priori" information about the probability density function of the texture and it can be directly applied on adaptive neighborhoods. Interesting results are obtained when coupling this FP estimator with an adaptive spatial support driven on the scalar span information. The proposed method is tested with both simulated POLSAR data and high resolution POLSAR data acquired over the French Alps.

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Fichiers liés : Vasile2008.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 06/07/2008
• Auteurs : Joffrey MoirouxCecile Le LannJean-Sébastien PierrePhilippe VernonJoan van BaarenJacques J.M. J.M. van Alphen
• Organismes : Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Ecosystèmes, biodiversité, évolution [Rennes] Paysages, Changements Climatique, Biodiversité

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• Type de publi. : Article dans une revue
• Date de publi. : 01/07/2008
• Auteurs : Alexandra GianoncelliJacques CastaingLuc OrtegaEric DooryheeJoseph SalomonPhilippe WalterJean-Louis HodeauPierre Bordet
• Organismes : Centre de recherche et de restauration des musées de France Centre de recherche et de restauration des musées de France X'Press : diffraction et hautes pressions Matériaux, Rayonnements, Structure Centre de recherche et de restauration des musées de France Centre de recherche et de restauration des musées de France Matériaux, Rayonnements, Structure Matériaux, Rayonnements, Structure
• Publié dans X-Ray Spectrometry le 27/10/2020

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Résumé : A portable system has been recently developed; it combines x-ray fluorescence (XRF) and x-ray diffraction (XRD) techniques, allowing simultaneous elemental analysis and phase identification of inorganic materials. A low power (30 W) air-cooled Cu anode x-ray source is used, equipped with a polycapillary semi-lens to provide a parallel x-ray beam. The system has been designed without mechanical movements and its configuration allows the analysis of objects with arbitrary shapes; the instrument is particularly suitable for material identification in cultural heritage applications where artefacts are non-moveable, and/or exhibit irregular surfaces and shapes. In this article, we present the design of the instrument and the first test measurements. In particular, our results show that it is possible to identify the main crystalline phases present in the samples and to perform the analysis in relatively short times, from 30 min to 1 or 2 h.

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• Type de publi. : Pré-publication, Document de travail
• Date de publi. : 01/07/2008
• Auteurs : Pierre BomelJean-Philippe DiguetGogniat GuyJérémie Crenne
• Organismes : Lab-STICC_UBS_CACS_MOCS Lab-STICC_UBS_CACS_MOCS Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192) Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)

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Résumé : In this paper we present a hierarchy of bitstreams repositories for FPGA-based networked and partially reconfigurable systems. These systems target embedded systems with very scarce hardware resources taking advantage of dynamic, specific and optimized architectures. Based on FPGA integrated circuits, they require a single FPGA with a network controller and less external memories to store reconfiguration software, bitstreams and buffer pools used by today's standard communication protocols. Our measures, based on a real implementation, show that our repository hierarchy is functional and can download bitstreams with a reconfiguration speed ten times faster than known solutions.

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Fichiers liés : ispdc.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/07/2008
• Auteurs : Nathalie LeonePierre DucimetièreJérôme GariépyDominique CourbonChristophe TzourioJean-François DartiguesKaren RitchieAnnick AlpérovitchPhillippe AmouyelMichel E. SafarMahmoud Zureik
• Organismes : Physiopathologie et Epidemiologie de l'Insuffisance Respiratoire Recherche en épidémiologie et biostatistique Centre de Médecine Préventive Cardiovasculaire Physiopathologie et Epidemiologie de l'Insuffisance Respiratoire Neuroépidémiologie Epidémiologie, santé publique et développement Neuropsychiatrie : recherche épidémiologique et clinique Neuroépidémiologie Epidémiologie des maladies chroniques : impact des interactions gène environnement sur la santé des populations Centre de diagnostic Physiopathologie et Epidemiologie de l'Insuffisance Respiratoire
• Publié dans Arteriosclerosis, Thrombosis, and Vascular Biology le 27/10/2020

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Résumé : OBJECTIVE: Arterial mechanical properties are of growing interest in the understanding of cardiovascular disease development. We aimed to determine the predictive value of carotid wall mechanics on coronary heart disease (CHD) in the Three-City study. METHODS AND RESULTS: At baseline, 3337 participants aged > or =65 years underwent a carotid B-mode ultrasonography. During a median follow-up of 43.4 months, 128 CHD occurred. Increased carotid distension (relative stroke change in lumen diameter) was significantly associated with CHD risk. Comparison of subjects in tertile 3 versus those in tertile 1 (reference) showed a hazard ratio (HR) of 1.80 (95% CI, 1.17 to 2.75). Controlling for various confounders including age, heart rate, brachial (or carotid) pulse pressure, and common carotid intima-media thickness did not alter the association between carotid distension and CHD with a HR of 1.79 (95% CI, 1.12 to 2.86; tertile 3 versus tertile 1). Brachial and carotid pulse pressures were also independently associated with CHD. No association was found between CHD and carotid distensibility coefficient, cross-sectional compliance coefficient, Young's elastic modulus, or beta stiffness index. CONCLUSIONS: In the elderly, increased carotid distension was independently predictive of CHD. This simple and noninvasive parameter might be of particular interest for cardiovascular risk assessment.

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Fichiers liés : Leone_ATVB_2008.pdf

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