Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Sébastien CouvreurCatherine HurtaudPierre-Guy MarnetPhilippe FaverdinJean-Louis J.-L. Peyraud
• Organismes : Production du lait Ecole Supérieure des Agricultures Production du lait Production du lait Production du lait Production du lait
• Publié dans Journal of Dairy Science le 22/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Jean‑philippe DegeaiJean-Pierre Peulvast
• Organismes : Laboratoire de géographie physique : Environnements Quaternaires et Actuels Laboratoire de géographie physique : Environnements Quaternaires et Actuels
• Publié dans Géographie physique et Quaternaire le 26/10/2020

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Résumé : Résumé Une nouvelle méthode de calcul de l'érosion à long terme est proposée à partir des caractéristiques morphométriques des cratères d'impact complexes. Cette méthode permet d'estimer l'épaisseur de la tranche de substrat érodé autour d'un astroblème, forme dégradée d'un cratère d'impact. Pour cela, la morphométrie initiale du cratère est reconstituée afin d'estimer l'altitude de la topographie pré-impactique. Deux paramètres morphométriques sont retenus~: le diamètre de la structure d'impact et sa profondeur réelle, c'est-à-dire la distance entre la topographie pré-impactique et la base des brèches d'impact polymictiques. Une relation entre ces deux paramètres a été déterminée à partir d'une base de données portant sur 31 cratères d'impact complexes terrestres bien conservés. Cette méthode est appliquée à quatre grands astroblèmes, d'âge dévonien à triasique, situés au Québec (Charlevoix, Manicouagan, lac à l'Eau Claire est) et dans l'ouest du Massif central français (Rochechouart). Les tranches de substrat érodé autour de ces astroblèmes depuis leur formation sont estimées entre 100 et 2~000~m d'épaisseur. Les taux moyens d'érosion post-impactique sont relativement faibles, avec des valeurs comprises entre 1 et 10~m/Ma. Au Québec, l'érosion à long terme au cours des temps phanérozoïques semble avoir été 2 à 4 fois plus forte sur la bordure du Bouclier canadien (Laurentides) qu'à l'intérieur (Labrador). , Abstract Morphometric characteristics of complex impact craters are used in order to develop a new calculation method of long-term erosion. This one is based on an assessment of the eroded bedrock thickness around an astrobleme, a morphologically degraded impact crater. First, the initial crater morphometry is reconstructed, in order to determine the elevation of the pre-impact surface. Two morphometric parameters are used~: the diameter of the impact structure and its true depth, i.e. the height difference between the pre-impact surface and the bottom of the polymictic impact breccias. A relationship between both parameters was established from a database of 31 morphologically well-preserved terrestrial complex impact craters. This calculation method was applied to four Devonian to Triassic large astroblemes located in Québec (Charlevoix, Manicouagan, Clear Water Lake) and the western French Massif Central (Rochechouart). Bedrock thicknesses eroded around these astroblemes since their formation are evaluated between 100 and 2~000~m. Post-impact mean erosion rates are relatively low, with values ranging from 1 to 10~m/Ma. In Québec, the long-term erosion on the southeastern edge of the Canadian Shield (Laurentides) during the Phanerozoic times seems have been from 2 to 4 times higher than the one in the interior (Labrador).

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Philippe Minard
• Organismes : Institutions et Dynamiques Historiques de l'Economie

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Pierre-Antoine GourraudPhilippe DieudéJean-Frédéric BoyerLeonor NogueiraAnne Cambon-ThomsenBernard MazieresFrançois CornélisGuy SerreAlain CantagrelArnaud Constantin
• Organismes : Epidémiologie et Analyses en Santé Publique : risques, maladies chroniques et handicap Service Epidémiologie clinique et santé publique [CHU Toulouse] Université Toulouse III - Paul Sabatier Service de Rhumatologie Université Toulouse III - Paul Sabatier Centre de Rhumatologie [CHU Toulouse] Laboratoire de Biologie Cellulaire et Cytologie [CHU Toulouse] Epidémiologie et Analyses en Santé Publique : risques, maladies chroniques et handicap Université Toulouse III - Paul Sabatier Centre de Rhumatologie [CHU Toulouse] Laboratoire de recherche européen pour la polyarthrite rhumatoïde Laboratoire de Biologie Cellulaire et Cytologie [CHU Toulouse] Université Toulouse III - Paul Sabatier Centre de Rhumatologie [CHU Toulouse] Epidémiologie et Analyses en Santé Publique : risques, maladies chroniques et handicap Service Epidémiologie clinique et santé publique [CHU Toulouse] Université Toulouse III - Paul Sabatier Centre de Rhumatologie [CHU Toulouse]
• Publié dans Arthritis Research and Therapy le 27/10/2020

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Résumé : The HLA-DRB1 gene was reported to be associated with anticitrullinated protein/peptide autoantibody (ACPA) production in rheumatoid arthritis (RA) patients. A new classification of HLA-DRB1 alleles, reshaping the shared epitope (SE) hypothesis, was recently found relevant in terms of RA susceptibility and structural severity. We investigated the relevance of this new classification of HLA-DRB1 SE+ alleles in terms of rheumatoid factor (RF) and ACPA production in a sample of French RA patients. We studied 160 early RA patients included in a prospective longitudinal cohort of French Caucasian patients with recent-onset arthritis. RF, anticyclic citrullinated peptide 2 (anti-CCP2) and antideiminated human fibrinogen autoantibodies (AhFibA) were assessed in all patients at inclusion. The HLA-DRB1 gene was typed by PCR-sequence specific oligonucleotides probes (PCR-SSOP), and SE+ alleles were classified into four groups (S1, S2, S3P, S3D) according to the new classification. The new classification of HLA-DRB1 SE+ alleles distinguishes predisposing and protective alleles for RF, anti-CCP2 or AhFibA production. The presence of S2 or S3P alleles is associated with both RF, anti-CCP2 or AhFibA positivity, whereas the presence of S3D or S1 alleles appears to be protective for RF, anti-CCP2 or AhFibA positivity. The new classification of HLA-DRB1 SE+ alleles is relevant in terms of autoantibody production in early RA patients by differentiating predisposing and protective alleles for RF or ACPA production. © 2007 Gourraud et al., licensee BioMed Central Ltd.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Horst Uwe KellerMichael KüppersSonia FornasierPedro J. GutierrezStubbe F. HviidLaurent JordaJörg KnollenbergStephen LowryMiriam RengelIvano BertiniGabriele CremoneseW. IpDetlef KoschnyRainer KrammEkkehard KührtLuisa M. LaraHolger SierksNicholas ThomasCesare BarbieriPhilippe LamyHans RickmanRafael RodrigoM. F. A'HearnFrancesco AngrilliMaria Antonietta BarucciJean-Loup BertauxVania da DeppoBjörn DavidssonM. de CeccoStefano DebeiMarco FulleFritz GliemOlivier GroussinJosé J. López-MorenoFrancesco MarzariGiampiero NalettoLola SabauAngel Sanz AndrésKlaus-Peter Wenzel
• Organismes : Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Planétologie du LESIA Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo” Instituto de Astrofísica de Andalucía = Institute of Astrophysics of Andalusia Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research Laboratoire d'Astrophysique de Marseille DLR Institut für Planetenforschung Astrophysics Research Centre [Belfast] Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo” INAF - Osservatorio Astronomico di Padova Institute of Space Science [Taiwan] European Space Research and Technology Centre Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research DLR Institut für Planetenforschung Instituto de Astrofísica de Andalucía = Institute of Astrophysics of Andalusia Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research Physikalisches Institut [Bern] Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo” Laboratoire d'Astrophysique de Marseille Department of Astronomy and Space Physics [Uppsala] Instituto de Astrofísica de Andalucía = Institute of Astrophysics of Andalusia Department of Astronomy [College Park] Università degli Studi di Padova = University of Padua Dipartimento di Ingegneria Meccanica [Padova] Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Planétologie du LESIA Service d'aéronomie Department of Information Engineering [Padova] Department of Astronomy and Space Physics [Uppsala] Università degli Studi di Trento = University of Trento Università degli Studi di Trento = University of Trento INAF - Osservatorio Astronomico di Trieste Institut für Datentechnik und Kommunikationsnetze Department of Astronomy [College Park] Instituto de Astrofísica de Andalucía = Institute of Astrophysics of Andalusia Dipartimento di Fisica e Astronomia "Galileo Galilei" Department of Information Engineering [Padova] Instituto Nacional de Técnica Aeroespacial Instituto de Microgravedad "Ignacio Da Riva" European Space Research and Technology Centre
• Publié dans Icarus le 30/10/2020

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Résumé : The OSIRIS cameras on the Rosetta spacecraft observed Comet 9P/Tempel 1 from 5 days before to 10 days after it was hit by the Deep Impact projectile. The Narrow Angle Camera (NAC) monitored the cometary dust in 5 different filters. The Wide Angle Camera (WAC) observed through filters sensitive to emissions from OH, CN, Na, and OI together with the associated continuum. Before and after the impact the comet showed regular variations in intensity. The period of the brightness changes is consistent with the rotation period of Tempel 1. The overall brightness of Tempel 1 decreased by about 10% during the OSIRIS observations. The analysis of the impact ejecta shows that no new permanent coma structures were created by the impact. Most of the material moved with ˜200ms. Much of it left the comet in the form of icy grains which sublimated and fragmented within the first hour after the impact. The light curve of the comet after the impact and the amount of material leaving the comet (4.5 9×10kg of water ice and a presumably larger amount of dust) suggest that the impact ejecta were quickly accelerated by collisions with gas molecules. Therefore, the motion of the bulk of the ejecta cannot be described by ballistic trajectories, and the validity of determinations of the density and tensile strength of the nucleus of Tempel 1 with models using ballistic ejection of particles is uncertain.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Pierre MorelEtienne GravierNicolas BesseR. KleinA. GhizzoPierre BertrandXavier GarbetPhilippe GhendrihVirginie GrandgirardYanick Sarazin
• Organismes : Laboratoire de physique des milieux ionisés et applications Institut Jean Lamour Institut Élie Cartan de Nancy Scientific computation and visualization Laboratoire de physique des milieux ionisés et applications Association EURATOM-CEA Institut de Recherche sur la Fusion par confinement Magnétique Institut de Recherche sur la Fusion par confinement Magnétique Département de Recherche sur la Fusion Contrôlée
• Publié dans Physics of Plasmas le 02/11/2020

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Résumé : Predicting turbulent transport in nearly collisionless fusion plasmas requires one to solve kinetic (or, more precisely, gyrokinetic) equations. In spite of considerable progress, several pending issues remain; although more accurate, the kinetic calculation of turbulent transport is much more demanding in computer resources than fluid simulations. An alternative approach is based on a water-bag representation of the distribution function that is not an approximation but rather a special class of initial conditions, allowing one to reduce the full kinetic Vlasov equation into a set of hydrodynamic equations while keeping its kinetic character. The main result for the water-bag model is a lower cost in the parallel velocity direction since no differential operator associated with some approximate numerical scheme has to be carried out on this variable v∥. Indeed, a small bag number is sufficient to correctly describe the ion temperature gradient instability.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Antoine ScherrerNicolas LarrieuPhilippe OwezarskiPierre BorgnatPatrice Abry
• Organismes : Laboratoire de Physique de l'ENS Lyon Laboratoire d'analyse et d'architecture des systèmes Laboratoire d'analyse et d'architecture des systèmes Laboratoire de Physique de l'ENS Lyon Laboratoire de Physique de l'ENS Lyon
• Publié dans IEEE Transactions on Dependable and Secure Computing le 01/11/2020

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Résumé : The goals of the present contribution are twofold. First, we propose the use of a non-Gaussian long-range dependent process to model Internet traffic aggregated time series. We give the definitions and intuition behind the use of this model. We detail numerical procedures that can be used to synthesize artificial traffic exactly following the model prescription. We also propose original and practically effective procedures to estimate the corresponding parameters from empirical data. We show that this empirical model relevantly describes a large variety of Internet traffic, including both regular traffic obtained from public reference repositories and traffic containing legitimate (flash crowd) or illegitimate (DDoS attack) anomalies. We observe that the proposed model accurately fits the data for a wide range of aggregation levels. The model provides us with a meaningful multiresolution (i.e., aggregation level dependent) statistics to characterize the traffic: the evolution of the estimated parameters with respect to the aggregation level. It opens the track to the second goal of the paper: anomaly detection. We propose the use of a quadratic distance computed on these statistics to detect the occurrences of DDoS attack and study the statistical performance of these detection procedures. Traffic with anomalies was produced and collected by us so as to create a controlled and reproducible database, allowing for a relevant assessment of the statistical performance of the proposed (modeling and detection) procedures

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Olivier DelouisJean-Luc LamboleyPhilippe LenhardtFrançois QuantinAltin SkenderajStephane VergerB. Vrekaj
• Organismes : ORIENT ET MÉDITERRANÉE : Textes, Archéologie, Histoire Institut national de recherches archéologiques préventives Anthropologie et Histoire des Mondes Antiques Institut de recherche sur l'architecture antique Archéologies d'Orient et d'Occident et Sciences des textes

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2007
• Auteurs : Philippe Bordes
• Organismes : Art, images, sociétés

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2007
• Auteurs : Philippe WaldteufelPhilippe RichaumeYann H. KerrWigneron J.-P.Ali MahmoodiArnaud MialonJ.-L. VergelyFrançois CabotPaolo FerrazzoliSteven Delwart
• Organismes : Service d'aéronomie Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Écologie fonctionnelle et physique de l'environnement Array Systems Computing Centre d'études spatiales de la biosphère Analytic and Computational Research, Inc. - Earth Sciences Centre d'études spatiales de la biosphère Università degli Studi di Roma Tor Vergata [Roma, Italia] = University of Rome Tor Vergata [Rome, Italy] = Université de Rome Tor Vergata [Rome, Italie] European Space Research and Technology Centre

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Résumé : This contribution summarizes prominent features of the Level 2 algorithm aimed at processing land surface geophysical quantities from the ESA-led SMOS mission. It emphasizes the soil moisture retrieval and describes the decision tree built in order to select appropriate retrieval configurations. The expected performance is illustrated by preliminary results of the algorithm validation.

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