Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 31/07/2006
• Auteurs : Jordi FontJacqueline BoutinNicolas ReulPhilippe WaldteufelCarolina GabarróSonia ZineJoseph TenerelliFrançois PetitcolinJean-Luc Vergely
• Organismes : Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques

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• Type de publi. : Communication dans un congrès
• Date de publi. : 25/07/2006
• Auteurs : Muriel CarinPierre-Yves ManachOlivier MenesPhilippe RogeonPhilippe PilvinJean-François Sigrist
• Organismes : Laboratoire d'Ingénierie des Matériaux de Bretagne Laboratoire d'Ingénierie des Matériaux de Bretagne DCNS Group [Nantes] Laboratoire d'Ingénierie des Matériaux de Bretagne Laboratoire d'Ingénierie des Matériaux de Bretagne DCNS Group [Nantes]

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Résumé : The aim of this study is to estimate residual stresses and distortions during the assembly of dissimilar metallic materials welded by Electron Beam Welding (EBW) technique. This work is motivated by a new welding procedure for the manufacture of large speed reduction gear. The gear consists of a central hub of S275 J2G3 steel and a toothed wheel of 32CrMoV13 steel, chosen for its high fatigue performances. Preliminary experimental welding tests have shown the opening of the joint plane during the circular welding of the gear leading to lack-of-fusion defects. To improve the joining technique, a thermomechanical model has been developed to predict the opening of the joint plane during welding. A two-dimensional finite element model has been applied on a simplified geometry of smaller size. The opening of the joint plane has been modelled by two different ways, the first one uses activation / deactivation elements and the second one uses specific contact elements. Both techniques have shown similar displacements. The assumptions of plane stress or generalized plane strain are discussed. Numerical results obtained with similar metals with or without metallurgical transformations are presented. Calculations carried out with dissimilar metals are compared with experiments in terms of fusion zone size and displacements.

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Fichiers liés : carin2006.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 24/07/2006
• Auteurs : Gabriel VasileIvan PétillotAndreea JuleaEmmanuel TrouvéPhilippe BolonLionel BombrunMichel GayTania LandesP. GrussenmeyerJean-Marie Nicolas
• Organismes : Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Analyse et Traitement d'Images Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Analyse et Traitement d'Images Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire des images et des signaux Laboratoire des images et des signaux Modèles et simulation pour l'architecture, l'urbanisme et le paysage Modèles et simulation pour l'architecture, l'urbanisme et le paysage Laboratoire Traitement et Communication de l'Information

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Résumé : SAR interferometric data offers the opportunity to measure temperate glacier surface topography and displacement between the two acquisitions. Recently, reliable estimates of the phase gradient given by interferogram local frequencies become mandatory with the increase of the SAR resolution. In this paper, an original 2-step method for estimating local frequencies is proposed. The 2D phase signal is considered to have two deterministic components corresponding to low-resolution fringes and high-resolution patterns due for instance to the micro-relief. The first step of the proposed algorithm consists in the low-resolution phase flattening. In the second step the local high-resolution frequencies are estimated from the phase auto-correlation functions computed on adaptive neighborhoods using only the pixels which belong to the same HR spatial feature and respect the ”local stationarity” hypothesis. Results with both real ERS 1/2 tandem and simulated TerraSAR-X interferograms are presented to illustrate the potential of the proposed method.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 24/07/2006
• Auteurs : Gabriel VasileIvan PétillotAndreea JuleaEmmanuel TrouvéPhilippe BolonLionel BombrunMichel GayTania LandesP. GrussenmeyerJean-Marie Nicolas
• Organismes : Laboratoire des images et des signaux Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire d'Analyse et Traitement d'Images Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance Laboratoire des images et des signaux Laboratoire des images et des signaux Modèles et simulation pour l'architecture, l'urbanisme et le paysage Modèles et simulation pour l'architecture, l'urbanisme et le paysage Laboratoire Traitement et Communication de l'Information

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Résumé : SAR interferometric data offers the opportunity to measure temperate glacier surface topography and displacement between the two acquisitions. Recently, reliable estimates of the phase gradient given by interferogram local frequencies become mandatory with the increase of the SAR resolution. In this paper, an original 2-step method for estimating local frequencies is proposed. The 2D phase signal is considered to have two deterministic components corresponding to low-resolution fringes and high-resolution patterns due for instance to the micro-relief. The first step of the proposed algorithm consists in the low-resolution phase flattening. In the second step the local high-resolution frequencies are estimated from the phase auto-correlation functions computed on adaptive neighborhoods using only the pixels which belong to the same HR spatial feature and respect the ”local stationarity” hypothesis. Results with both real ERS 1/2 tandem and simulated TerraSAR-X interferograms are presented to illustrate the potential of the proposed method.

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Fichiers liés : Trouve_ieee_denver2006_PID232702.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 21/07/2006
• Auteurs : Eric C. GaucherPhilippe BlancFrédérique BardotGilles BraibantStéphane BuschaertCatherine CrouzetAnne GautierJean-Pierre GirardEmmanuel JacquotArnault LassinGabrielle NegrelChristophe TournassatA. VinsotScott Altmann
• Organismes : Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières Agence Nationale pour la Gestion des Déchets Radioactifs Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières Agence Nationale pour la Gestion des Déchets Radioactifs Geokemex sarl Bureau de Recherches Géologiques et Minières Bureau de Recherches Géologiques et Minières ANDRA Agence Nationale pour la Gestion des Déchets Radioactifs
• Publié dans Comptes Rendus. Géoscience le 29/07/2021

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Résumé : In ANDRA's studies to characterize the Callovian-Oxfordian formation, porewater chemistry is a key topic. Indeed, chemistry determines the durability of the repository materials (bentonite, concrete, metals, nuclear glass) and the speciation (and thus the mobility) of radionuclides. The method developed in the frame of the THERMOAR project enables the acquisition of a complete set of data from core samples to model the porewater chemistry. The method requires a detailed mineralogical study, a model of free-water/bound-water distribution, leaching experiments, adsorbed ion measurements, ion-exchange constant acquisition, and CO2 partial-pressure measurements. These experiments and measurements were done on samples from the site of the Meuse/Haute-Marne laboratory and from ANDRA's regional boreholes. The regional stability of a great number of parameters can be observed, except for a decrease of the Na and Cl concentration following a NE-SW axis passing through the laboratory. The water/rock equilibrium model makes it possible to calculate the chemical composition of interstitial waters of the formation.

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Fichiers liés : Gaucher_10-1016-j-crte-2006-06-002.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 16/07/2006
• Auteurs : Luc DaméSerge KoutchmyS. KuzinPhilippe LamyJean-Marie MalherbeJ.-C. Noëns
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique solaire Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique solaire

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• Type de publi. : Communication dans un congrès
• Date de publi. : 16/07/2006
• Auteurs : Laurent JordaPhilippe LamyG. FauryHorst Uwe KellerMichael KüppersStubbe F. HviidDetlef KoschnyJean LecacheuxPedro J. GutierrezLuisa M. Lara
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Pôle Planétologie du LESIA

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• Type de publi. : Communication dans un congrès
• Date de publi. : 16/07/2006
• Auteurs : Milan MaksimovicThierry AppourchauxGuillaume AulanierThomas ChustThierry Dudok de WitKarl-Ludwig KleinV. V. KrasnoselskikhPhilippe LouarnA. RouxJean-Claude Vial
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Physique solaire Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Physique solaire Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Physique solaire

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• Type de publi. : Article dans une revue
• Date de publi. : 15/07/2006
• Auteurs : Richard DelormeChristelle M. DurandCatalina BetancurMichael WagnerStephan RuhrmannHans-Juergen GrabeGudrun NygrenChristopher GillbergMarion LeboyerThomas BourgeronPhilippe CourtetFabrice JollantCatherine BuresiJean-Michel AubryPatrick BaudGuido BondolfiGilles BertschyNader PerroudAlain Malafosse
• Organismes : Génétique Humaine et Fonctions Cognitives Neurobiologie et Psychiatrie Génétique Humaine et Fonctions Cognitives Neurobiologie et Psychiatrie Department of Psychiatry Department of Psychiatry and Psychotherapy Department of Psychiatry Department of Child and Adolescent Psychiatry Department of Child and Adolescent Psychiatry Neurobiologie et Psychiatrie Génétique Humaine et Fonctions Cognitives Département de Psychiatrie adulte [Hôpital de la Colombière - CHU Montpellier] Pathologies du système nerveux : recherche épidémiologique et clinique Département de Psychiatrie adulte [Hôpital de la Colombière - CHU Montpellier] Pathologies du système nerveux : recherche épidémiologique et clinique Department of Mental Health and Psychiatry Department of Mental Health and Psychiatry Department of Mental Health and Psychiatry Department of Mental Health and Psychiatry Department of Mental Health and Psychiatry Department of Mental Health and Psychiatry Pathologies du système nerveux : recherche épidémiologique et clinique Department of Mental Health and Psychiatry
• Publié dans Biological Psychiatry le 01/11/2020

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Résumé : BACKGROUND: It was recently reported that a rare functional variant, R441H, in the human tryptophan hydroxylase-2 gene (hTPH2) could represent an important risk factor for unipolar major depression (UP) since it was originally found in 10% of UP patients (vs. 1.4% in control subjects). METHODS: We explored the occurrence of this variation in patients with affective disorders (n = 646), autism spectrum disorders (n = 224), and obsessive-compulsive disorder (OCD) (n = 201); in healthy volunteers with no psychiatric disorders (n = 246); and in an ethnic panel of control individuals from North Africa, Sub-Saharan Africa, India, China, and Sweden (n = 277). RESULTS: Surprisingly, we did not observe the R441H variant in any of the individuals screened (3188 independent chromosomes). CONCLUSIONS: Our results do not confirm the role of the R441H mutation of the hTPH2 gene in the susceptibility to UP. The absence of the variant from a large cohort of psychiatric patients and control subjects suggests that the findings reported in the original study could be due to a genotyping error or to stratification of the initial population reported. Additional data by other groups should contribute to the clarification of the discrepancy between our results and those previous published.

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Fichiers liés : Delorme_TPH2_Biol_Psychiatry_2006.pdf

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• Type de publi. : Pré-publication, Document de travail
• Date de publi. : 11/07/2006
• Auteurs : David EhrenreichAlain Lecavelier Des EtangsJean-Philippe BeaulieuOlivier Grasset
• Organismes : Institut d'Astrophysique de Paris Institut d'Astrophysique de Paris Institut d'Astrophysique de Paris Laboratoire de Planétologie et Géodynamique de Nantes [UMR 6112]

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Résumé : Extrasolar planets as light as a few Earths are now being detected. Such planets are likely not gas or ice giants. Here, we present a study on the possible properties of the small and cold extrasolar planets, applied to the case of the recently discovered planet OGLE-2005-BLG-390Lb (Beaulieu et al. 2006). This planet (5.5[+5.5/-2.7] Earth masses) orbits 2.6[+1.5/-0.6]-astronomical units away from an old M-type star of the Galactic Bulge. The planet should be entirely frozen given the low surface temperature (35 to 47 K). However, depending on the rock-to-ice mass ratio in the planet, the radiogenic heating could be sufficient to make the existence of liquid water within an icy crust possible. This possibility is estimated as a function of the planetary mass and the illumination received from the parent star, both being strongly related by the observational constraints. The results are presented for water-poor and water-rich planets. We find that no oceans can be present in any cases at 9-10 Gyr, a typical age for a star of the Bulge. However, we find that, in the past when the planet was < 5-billion-years old, liquid water was likely present below an icy surface. Nevertheless, the planet is now likely to be entirely frozen.

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Fichiers liés : ms.pdf

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