Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/11/1999
• Auteurs : Valérie LavalMatthieu ChabannesMarguerite CarrièreHervé CanutAnnick BarrePierre RougéRafael Pont-LezicaJean-Philippe Galaud
• Organismes : Surfaces Cellulaires et Signalisation chez les Végétaux
• Publié dans Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology le 28/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/11/1999
• Auteurs : Dominique BabutyLaurent FauchierDavid Tena-CarbiPhilippe PoretJosette LecheMartine RaynaudJean Paul FauchierPierre Cosnay
• Organismes : Centre Hospitalier Régional Universitaire de Tours CHU Trousseau [Tours] Human Molecular Genetics Centre Hospitalier Régional Universitaire de Tours
• Publié dans American Journal of Cardiology le 22/10/2020

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Résumé : In 39 patients with myotonic dystrophy, we found a high percentage of infrahissian cardiac conduction abnormalities (51%) and late potentials (46%), whereas spontaneous and inducible ventricular arrhythmias were rare. These results suggest that the prolongation of QRSD and the duration of the low-amplitude signal on the signal-averaged electrocardiogram were related to delayed activation of the His and Purkinje tissue rather than true late potentials.

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• Type de publi. : Pré-publication, Document de travail
• Date de publi. : 01/10/1999
• Auteurs : Jean-Pierre FavennecPhilippe Copinschi
• Organismes : IFP Energies nouvelles IFP Energies nouvelles

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Résumé : La région du Golfe de Guinée en Afrique de l’Ouest est l’une de celles dont la production et les réserves ont le plus considérablement augmenté depuis quelques années, essentiellement grâce à l’offshore. C’est également là que se sont faites les plus spectaculaires découvertes de ces dernières années notamment en mer profonde. Les faibles coûts de production et le bon accueil réservé aux investisseurs étrangers font de la région une destination de choix pour toutes les grandes compagnies internationales, même si les incertitudes et les tensions politiques demeurent et fragilisent la situation. Dans ces conditions, les relations qu’entretiennent les États hôtes avec les compagnies pétrolières étrangères évoluent : au-delà des aspects purement formels de ces nouveaux rapports (voir encadré consacré aux contrats pétroliers), c’est tout l’ancien système des “ chasses gardées ” qui est remis en cause par l’ouverture de plus en plus grande du secteur aux lois de la concurrence. Neuf pays seront développés en détail : le Nigeria, l’Angola, le Gabon, le Congo, le Cameroun, la Guinée Equatoriale, la Côte d’Ivoire et le Tchad.

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Fichiers liés : CEG33.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 23/09/1999
• Auteurs : Frédéric BironJean-Philippe PlazeJérôme TissierLaurent BillonnetDominique CrosB. JarryPierre Guillon
• Organismes : Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes XLIM XLIM Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes XLIM Institut de Recherche en Communications Optiques et Microondes

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Résumé : This article pm9erits a method to synthesize microwave activejilters using negative resistarms in M M X leclanology. The negative resistatice circuits employed are bused on classicid negcitive iqmlunce converkrs ("ICs). Our topologies are validated with computer sbtiulations orad with mensurmcnts. We then nssociute our circuits with sevesd passive microwlave bawdsislopfi1ter.s. We also cyyly the upproactt to passive microwave bandpass $&erS.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/08/1999
• Auteurs : Kristian KunzPhilippe PetitjeanMohamed LisriFrances ChantrelChristian KoehlMarie-Louise WieselJean-Pierre CazenaveBruno MoulinThierry Hannedouche
• Organismes : Hôpitaux Universitaires de Strasbourg Biologie et pharmacologie de l'hémostase et de la thrombose
• Publié dans Nephrology Dialysis Transplantation le 01/11/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/08/1999
• Auteurs : Denis BarataudFabrice BlacheAlain MalletPhilippe BouysseJean-Michel NebusJean-Pierre VilotteJuan ObregonJ. VerspechtP. Auxemery
• Organismes : Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes Institut de Recherche en Communications Optiques et Microondes
• Publié dans IEEE Transactions on Instrumentation and Measurement le 31/10/2020

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Résumé : One of the most important requirements that RF and microwave power amplifiers designed for radiocommunication systems must meet is an optimum power added efficiency (PAE) or an optimal combination of PAE and linearity. A harmonic active load-pull system which allows the control of the first three harmonic frequencies of the signal coming out of the transistor under test is a very useful tool to aid in designing optimized power amplifiers. In this paper, we present an active load-pull system coupled to a vectorial “nonlinear network” analyzer. For the first time, optimized current/voltage waveforms for maximum PAE of microwave field effect transistors (FET's) have been measured. They confirm the theory on high efficiency microwave power amplifiers. The proposed load-pull setup is based on the use of three separated active loops to synthesize load impedances at harmonics. The measurement of absolute complex power waves is performed with a broadband data acquisition unit. A specific phase calibration of the set-up allows the determination of the phase relationships between harmonic components. Therefore, voltage and current waveforms can be extracted. The measurement results of a 600 gate periphery GaAs FET (Thomson Foundry) exhibiting a PAE of 84% at 1.8 GHz are given. Such results were obtained by optimizing the load impedances at the first three harmonic components of the signal coming out of the transistor. Optimum conditions correspond to a class F operation mode of the FET (i.e., square wave output voltage and pulse shaped output current). A comparison between measured and simulated current/voltage waveforms is also presented

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• Type de publi. : Article dans une revue
• Date de publi. : 01/08/1999
• Auteurs : Fabrice PhilippeGabriel DebsJean-Yves Jaffray
• Organismes : Systèmes d'aide à la décision et à la formation Systèmes d'aide à la décision et à la formation
• Publié dans Mathematics of Operations Research le 28/10/2020

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Résumé : Properties of convex and monotone capacities of infinite order in Polish spaces are studied and used to justify the representation of certain situations of imprecise risk (imprecisely known probabilities) by lower probabilities, which are monotone of infinite order. Decision making with imprecise risk is then modeled, and linear utility theory is shown to be generalizable to the case of imprecise risk.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/08/1999
• Auteurs : Jean-Michel VallatPhilippe SindouBertrand GarbayPierre-Marie PreuxThierry AnaniLaurence RichardMartine Diot
• Organismes : Service de Neurologie [CHU Limoges] Service de Neurologie [CHU Limoges] Laboratoire de biogenèse membranaire Service de Neurologie [CHU Limoges] Service de Neurologie [CHU Limoges] Service de Neurologie [CHU Limoges] Service de Neurologie [CHU Limoges]
• Publié dans Acta Neuropathologica le 25/10/2020

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Résumé : The Trembler mouse (Tr) suffers from a dominantly inherited autosomal mutation (glycine to aspartic acid. G150D) affecting the PMP22 gene, which results in an abnormal myelination of the peripheral nervous system. The Tr mouse represents an animal model for the human hereditary neuropathy, Charcot-Marie-Tooth disease. We compared the expression of PMP22, P0, myelin basic protein (MBP) and myelin-associated glycoprotein (MAG) in nerve biopsies from a 1-year-old heterozygous Tr mouse (Tr/+) with that of a control mouse of the same age. Quantitative and qualitative ultrastructural immunocytochemical analysis showed a significant decrease in PMP22, P0 and MBP and an abnormal location of the MAG in the sciatic nerve of the Tr/+ mouse. We also noted a marked reduction in number of myelinated fibers associated with the presence of two types of myelinated axons: a population of abnormally thin myelin sheaths with lower PMP22 labeling than that observed in myelinated fibers from the control mouse, and some others fibers with normal sheaths for axons of comparable diameter to those of normal mouse with no difference in the PMP22 immunolabeling. This pointed to an involvement of PMP22 in the structure of myelin sheaths.

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Fichiers liés : vallat1999.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 31/07/1999
• Auteurs : Elisabeth Le SauxPhilippe LencaPhilippe PicouetJean-Pierre Barthélemy
• Organismes : Département Logique des Usages, Sciences sociales et Sciences de l'Information Département Logique des Usages, Sciences sociales et Sciences de l'Information Département Logique des Usages, Sciences sociales et Sciences de l'Information Département Logique des Usages, Sciences sociales et Sciences de l'Information

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Résumé : Nowadays, firms, formerly considering the hu- man operator as the main error source in pro- cess control, bend their efforts towards anthro- pocentric approaches to (re)integrate the hu- man factor, especially the knowledge he/she has been developping, as the essential resource for a high quality decision process. As the expert operator remains a rare resource and in order to capitalize his/her knowledge and know-how, the development, of tools inte- grating this new dimension has become an im- portant challenge. This paper deals with a tool for knowledge ac- quisition under cognitive constraints, assuming that cognitive principles could be sometimes useful to improve machine learning tools re- sults. Additionally, we have to cope with the difficulty linked to the fact that the acquired strategies have to be adapted on-line. After describing the underlying cognitive prin- ciples, we will introduce the decision represen- tation space and its related notations. We will then show the difficulties linked to the search of an optimal representation of the expert strate- gies set and how the heuristics used by the al- gorithm studied avoid these NP-complete prob- lems. Finally, the current results and our work perspectives are stated.

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• Type de publi. : Article dans une revue
• Date de publi. : 30/07/1999
• Auteurs : Laurent OttavianiMarie-Laure LocatelliDominique PlansonKarine IsoirdJean-Pierre ChanteE. MorvanPhilippe Godignon
• Organismes : Centre de génie électrique de Lyon Centre de génie électrique de Lyon Centre de génie électrique de Lyon Centre de génie électrique de Lyon
• Publié dans Materials Science and Engineering: B le 28/10/2020

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Résumé : Bipolar diodes, protected with junction termination extensions, were processed in 6H-SiC. A 5-fold aluminum implantation was carried out for the main p(+)-n junction creation, which led to the material amorphization. The recrystallization variation with the annealing temperature and duration is examined in this paper. We performed the Al implantations with apposite energy orders, in order to study their influence on the diode electrical characteristics. The increasing order led to a better forward conduction. and reverse leakage currents more important.

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