Philippe JEAN-PIERRE

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2003
• Auteurs : Jean CorneloupPhilippe BourdeauPascal MaoEric Boutroy
• Organismes : Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Cedric DumoulinPierre BouletJean-Luc DekeyserPhilippe Marquet
• Organismes : Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time

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Résumé : The development of embedded applications is very difficult. Several different languages are usually used to specify different parts of the application or of the hardware. Dealing with so many languages can be daunting. A separation of the preoccupations: application, hardware architecture, association between them and the simulation or execution technologies are keys to efficient co-design of embedded applications. The Model Driven Architecture can be used to better deal with the reuse of parts of the design and the interoperability between both the implementation technologies and the various simulation levels. par We propose a construction of metamodels to support a co-design methodology. This construction will be experimented on intensive signal processing application co-design to justify the adequacy of this methodology to usual industrial development techniques.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Jean‐sébastien LauretChristophe VoisinGuillaume CassaboisClaude DelalandePhilippe RoussignolOliver JostLaurence Goux-Capes
• Organismes : Laboratoire Pierre Aigrain Motorola Labs Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Technische Universität Dresden = Dresden University of Technology Motorola Labs Laboratoire d'Electronique Moléculaire
• Publié dans Physical Review Letters le 02/11/2020

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Résumé : Time-resolved carrier dynamics in single wall carbon nanotubes is investigated by means of two-color pump-probe experiments. The recombination dynamics is monitored by probing the transient photo-bleaching observed on the first interband transition of the semi-conducting tubes. The carrier dynamics takes place on a one picosecond time scale which is one order of magnitude slower than in graphite. Transient photo-induced absorption is observed with exactly the same dynamics for non-resonant probe conditions and is interpreted as a global red shift of the $\pi-$plasmon resonance. We show that the opening of the band gap in semi-conducting carbon nanotubes determines the non-linear response dynamics over the whole visible and near-infrared spectrum.

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Fichiers liés : Voisin.pdf

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• Type de publi. : Rapport
• Date de publi. : 01/01/2003
• Auteurs : Philippe de ReffyeMaurice GoursatJean-Pierre QuadratBaogang Hu
• Organismes : Methods, algorithms and software in automatic control Methods, algorithms and software in automatic control Methods, algorithms and software in automatic control Eco-informatics

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Résumé : We explicit the dynamic equations followed by a tree during its growth according to the Greenlab model. In a first part we explicit the Organogenesis equations. In the second part, we recall the equations which, using a macroscopic photosynthesis point of view, describe with a great precision the evolution of the organ sizes. In a third part we establish the morphogenesis equations describing the geometry of a tree. The three parts are illustrated with an example.

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Fichiers liés : RR-4877.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Sébastien Le JanCéline AmyAurélie CazesCatherine MonnotNoël LamandéJudith FavierJosette PhilippeMathilde SibonyJean-Marie GascPierre CorvolStéphane Germain
• Organismes : Angiogénèse embryonnaire et pathologique Pathologie vasculaire et endocrinologie rénale - Chaire de médecine expérimentale Centre interdisciplinaire de recherche en biologie
• Publié dans American Journal of Pathology le 26/10/2020

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Résumé : Ischemic and solid tumor tissues are less well perfused than normal tissue, leading to metabolic changes and chronic hypoxia, which in turn promotes angiogenesis. We identified human angiopoietin-like 4 (angptl4) as a gene with hypoxia-induced expression in endothelial cells. We showed that the levels of both mRNA and protein for ANGPTL4 increased in response to hypoxia. When tested in the chicken chorioallantoic membrane assay, ANGPTL4 induced a strong proangiogenic response, independently of vascular endothelial growth factor. In human pathology, ANGPTL4 mRNA is produced in ischemic tissues, in conditions such as critical leg ischemia. In tumors, ANGPTL4 is produced in the hypoxic areas surrounding necrotic regions. We observed particularly high levels of ANGPTL4 mRNA in tumor cells of conventional renal cell carcinoma. Other benign and malignant renal tumor cells do not produce ANGPTL4 mRNA. This molecule therefore seems to be a marker of conventional renal cell carcinoma. ANGPTL4, originally identified as a peroxisome proliferator-activated receptor alpha and gamma target gene, has potential for use as a new diagnostic tool and a potential therapeutic target, modulating angiogenesis both in tumors and in ischemic tissues. This study also suggests that ANGPTL4 may provide a link between metabolic disorders and hypoxia-induced angiogenesis.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Jean-Philippe BétaJean-Pierre Cabestan
• Organismes : Université Panthéon-Assas Institut d'Asie Orientale
• Publié dans Contemporary Chinese Thought le 22/05/2023

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Bernard GuyJalel Ben-OthmanLuc BouganimGérôme CanalsBruno DefudeJean FerriéStéphane GançarskiRachid GuerraouiPascal MolliPhilippe PucheralClaudia RoncancioPatricia Serrano-AlvaradoPatrick Valduriez
• Organismes : Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux Centre National de la Recherche Scientifique Parallélisme, Réseaux, Systèmes, Modélisation Secured and Mobile Information Systems Environment for cooperation Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux Centre National de la Recherche Scientifique Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier Ecole Polytechnique Fédérale de Lausanne Environment for cooperation Secured and Mobile Information Systems Laboratoire d'Informatique de Grenoble Laboratoire d'Informatique de Nantes Atlantique Scientific Data Management
• Publié dans Revue des Sciences et Technologies de l'Information - Série TSI : Technique et Science Informatiques le 31/10/2020

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Résumé : Ce document est le résultat d'un travail collectif réalisé par les membres de l'action spécifique CNRS « Mobilité/Accès aux données ». Il fait le point sur l'état d'avancement des travaux réalisés dans le domaine des bases de données mobiles et identifie quelques orientations de recherche jugées particulièrement pertinentes. Compte tenu de la largeur du domaine, ce document ne prétend cependant pas à l'exhaustivité. Après une classification des applications mobiles et une caractérisation de leur environnement d'exécution, les problématiques suivantes sont analysées : gestion des données de localisation, modèles d'accès aux données, cohérence des traitements et synchronisation de copies, gestion de données embarquées, confidentialité des données et enfin adaptabilité des infrastructures logicielles à la mobilité et à la déconnexion.

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Fichiers liés : AS-CNRS-EtatDelArtMobilite-TSI2003-Journal.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Thierry PellarinWigneron J.-P.Jean-Christophe CalvetPhilippe Waldteufel
• Organismes : Centre national de recherches météorologiques Unité de bioclimatologie Centre national de recherches météorologiques Institut Pierre-Simon-Laplace
• Publié dans Journal of Geophysical Research le 01/11/2020

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Résumé : A technique to retrieve surface soil moisture was assessed at the global scale using a synthetic data set of L-band (1.4 GHz) brightness temperatures T-B for 2 years, 1987 and 1988. The global T-B database consists of half-degree continental pixels and accounts for within-pixel heterogeneity, on the basis of 1 km resolution land cover maps. The retrievals were performed using a three-parameter inversion method applied to the L-band Microwave Emission of Biosphere model ( L-MEB). Three land surface variables were retrieved simultaneously from the multiangular and dual-polarization T-B data: surface soil moisture wg, vegetation optical depth tau, and surface temperature T-S. The retrievals were obtained in two T-S configurations: T-S was either unknown or known with an uncertainty of 2 K. Applying these two assumptions, global maps of the estimated accuracy of the wg retrievals were produced, and the capability of the T-B to monitor wg was evaluated. A sensitivity study was carried out in order to analyze the effect of the main parameters that may affect the retrieval accuracy: the fraction cover of open water and forests, frozen soil conditions, and the radiometric noise on T-B. These results contribute to the better definition of the potential of the observations from future spaceborne missions such as the Soil Moisture and Ocean Salinity ( SMOS) project.

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Fichiers liés : 2002JD003086.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Guillaume MorinFarid JuillotCorinne CasiotOdile BruneelJean-Christian PersonnéFrançoise Elbaz-PoulichetMarc LeblancPhilippe IldefonseGeorges Calas
• Organismes : Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés
• Publié dans Environmental Science and Technology le 24/10/2020

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Résumé : The oxidation of Fe(II) in acid mine drainage (AMD) leads to the precipitation of Fe(III) compounds which may incorporate toxic elements, such as arsenic (As), within their structure or adsorb them at their surface, thus limiting their mobility. The present work provides evidence for spatial and seasonal variations of microbial activity that influence arsenite oxidation and As immobilization in the heavily contaminated AMD from the Carnoulès mine, Gard, France ([As III] = 80 to 280 mg·L-1 in the acidic spring draining the waste-pile). In the first tens of meters of the AMD, the rapid oxidation of Fe(II) leads to the coprecipitation of large amounts of As with Fe(III) in bacterial mats. XRD, XANES, and SEM analyses of sediments and stromatolite samples revealed the unusual formation of As(III)-rich compounds, especially nanocrystalline tooeleite, Fe6(AsO3)4(SO4)(OH)4·4H2O, a rare ferric arsenite sulfate oxy-hydroxide mineral, together with XRD-amorphous mixed As(III)/As(V)-Fe(III) oxy-hydroxide compounds. In the wet season, the suspended sediments of the upstream zone essentially consist of tooeleite associated with am-As(III)-Fe(III) oxy-hydroxides, while am-As(V)-Fe(III) oxy-hydroxides, having As:Fe molar ratios as high as 0.6-0.8, dominate in the dry season. Comparing natural and bioassay samples revealed that the formation of As(III)-rich compounds in the wet season may be related to the metabolic activity of bacterial strains able to oxidize Fe(II) but not As(III). One of these strains, having an Acidithiobacillus ferrooxidans genotype, has been isolated from the Carnoulès AMD. In contrast, the formation of As(V)-rich compounds in the dry season can be related to both biotic and abiotic oxidation of As(III) to As(V). Some Thiomonas strains isolated from the Carnoulès AMD were shown to be able to catalyze the oxidation of As(III) to As(V) in solution. Therefore, they can promote the formation of mixed As(V)-Fe(III) oxy-hydroxides, provided enough Fe(II) oxidizes. These results yield a better understanding of natural processes at this site and may help in designing efficient As-removal processes.

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Fichiers liés : Morin et al 2003.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Philippe BorgardJean-Pierre BrunLeguilloux MartineMarie Tuffreau-Libre
• Organismes : Centre Camille Jullian - Histoire et archéologie de la Méditerranée et de l'Afrique du Nord de la protohistoire à la fin de l'Antiquité Centre Jean Berard Centre Archéologique du Var Civilisations atlantiques & Archéosciences
• Publié dans Rivista di Studi Pompeiani le 22/01/2018

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