Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1991
• Auteurs : Ginette SaraccoJean-Pierre SessaregoJean SageloliPhilippe GuillemainRichard Kronland-Martinet
• Organismes : Laboratoire de Mécanique et d'Acoustique [Marseille] Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille]
• Publié dans Research Notes in Applied Mathematics, Masson-Springer le 27/06/2007

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Résumé : This paper isconcerned with the characterization of elastic targets immersed in a fluid and submitted to an acoustic impulse. Time-frequency methods have already been used in the case of scatterers of simple geometric shape. We have chosen the wavelet transform for its particular properties, such as linearity and local analysis at Df/f=Cst. We have developped an algorithm based on the behavior of the phase of the transform, which enables us to extract modulation laws (related to the dispersion law of the phase velocity), even for close echoes. In the case of spherical elastic shells,we have applied this method to both experimental and simulated signals. We point out the good agreement between theoretical ans experimental results.

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Fichiers liés : SpringMas91SSSGKM.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/1991
• Auteurs : Pierre BoherPhilippe HoudyLouis HennetZhigang LiAbhijit ModakDavid SmithM. IdirT. MorenoRobert BarchewitzMikhael KuehnePeter MuellerJean-Pierre Delaboudiniere
• Organismes : Laboratoire d'électronique de Philips Laboratoire d'électronique de Philips Laboratoire d'électronique de Philips Arizona State University [Tempe] Arizona State University [Tempe] Laboratoire de Chimie Physique - Matière et Rayonnement Laboratoire de Chimie Physique - Matière et Rayonnement Laboratoire de Chimie Physique - Matière et Rayonnement Institut d'astrophysique spatiale

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• Type de publi. :
• Date de publi. : 01/01/1991
• Auteurs : Mohamed HimdiJean Pierre DanielPhilippe Dupuis
• Organismes : Institut d'Électronique et des Technologies du numéRique Institut d'Électronique et des Technologies du numéRique CRITT Ct Reg Innovat Transfert Tech

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1991
• Auteurs : Michel CallonJean-Pierre CourtialPhilippe CrancePhilippe LarédoPhilippe MauguinVololona RabeharisoaYves-André RocherDominique Vinck
• Organismes : Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3 Centre de Sociologie de l'Innovation i3
• Publié dans Technology Analysis & Strategic Management le 09/04/2008

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1991
• Auteurs : Philippe GillesJean-Pierre Berlan
• Organismes : Laboratoire d'Économie Appliquée au Développement Centre de Recherche sur les Dynamiques, les Politiques Economiques et l'Economie des Ressources
• Publié dans Revue Economique le 28/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/1991
• Auteurs : Laurent JolivetPhilippe HuchonXavier Le PichonNicolas Chamot-RookeJean-Charles ThomasJean-Pierre Brun
• Organismes : Département de Géologie Institut des Sciences de la Terre d'Orléans Département de Géologie Institut des Sciences de la Terre de Paris Département de Géologie Collège de France - Chaire Géodynamique Département de Géologie Laboratoire de géologie de l'ENS Département de Géologie Centre National de la Recherche Scientifique
• Publié dans Journal of Geophysical Research : Solid Earth le 27/10/2020

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Résumé : We discuss the opening mechanism of the Japan Sea in Miocene time using (1) tectonic and published paleomagnetic data along the eastern margin from the north of Hokkaido Island to Sado Island, (2) a mechanical model which is tested by small-scale physical modeling, and (3) crustal structure and bathymetric features in the Japan Sea which constrain our kinematic model and preopening reconstructions. Our main conclusions are the following. The eastern margin of the Japan Sea was, as a whole, a dextral shear zone about 100 km wide. This conclusion is supported by the existence of a ductile dextral shear zone in Central Hokkaido (Hidaka Mountains) and associated brittle deformation in western Hokkaido and northeastern Honshu. The stress field during the opening (which ended about 12 Ma ago at the end of the middle Miocene) changes from right-lateral transpression in the north to right-lateral transtension in the south. The western margin, along the Korean peninsula, during the same period, also was an active dextral shear zone. Paleomagnetic results indicate that clockwise rotations occurred in the south during the opening and counterclockwise rotations in the north. We propose a model of right-lateral pull-apart deformation with clockwise rotations of rigid blocks in the southern transtensional domain and counterclockwise rotations in the transpressional one. Small-scale physical models show that the clockwise rotation in transtension is possible provided that the eastern boundary (Pacific side) is free of stress. The opening stopped and compression subsequently began about 12 Ma ago. Finally, we show that the dextral shear, which is distributed over the whole Japan Sea area, is accommodated by N-S trending right-lateral faults and rotation of blocks located between these right-lateral faults.

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Fichiers liés : 90JB02455.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/12/1990
• Auteurs : Philippe IldefonseJean-Pierre MullerBlandine ClozelGeorges Calas
• Organismes : Laboratoire de minéralogie, cristallographie de Paris Laboratoire de minéralogie, cristallographie de Paris ORSTOM Laboratoire de minéralogie, cristallographie de Paris Laboratoire de minéralogie, cristallographie de Paris
• Publié dans Engineering Geology le 22/10/2020

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Résumé : U-deposit hosted in hydrothermally altered tuffs in Mexico, together with weathering profiles from Cameroon were studied as natural analogues of radionuclide release and migration. Using petrological and spectroscopic methods (infrared and electron paramagnetic resonance), we have distinguished successive secondary mineral parageneses and the behaviour of radionuclides. In the U-deposit, the mineral parageneses show that uranium migration is mainly controlled by the redox potential and silica activity of the altering solutions. The high silica content of the solutions is caused by the intense alteration of volcanic rocks. Two types of secondary clay mineral parageneses are evidenced: a kaolinization, intense where uranium is accumulated in the welded tuffs, and a smectitization mainly developed in the underlying weakly welded tuffs. Several types of kaolinite have been defined according to their genesis (fillings in fissures and feldspar pseudomorphs), their location relative to a breccia pipe where uranium has accumulated (core and rim of the pipe; surrounding rhyolitic tuffs), and particle morphology, structural order and substitutional Fecontent. It is shown that the variations of the concentration of paramagnetic defect centres, always more than ten times as important than those measured in weathering kaolinites, are only correlated to the location of the kaolinites. The highest values correspond to the breccia pipe kaolinites, e.g. kaolinites located in the uranium accumulation zones. Moreover, one or two main defects centres are detected depending on the intimate association of kaolinites with uranium-bearing minerals. Besides, in weathering kaolinites from U-depleted laterites, defect centre concentrations are correlated to the total Fe203 content in bulk samples. This means that the defect centre acts as a memory of the travel of uranium when this element was sorbed onto iron gels in the first stage of weathering. It is concluded that paramagnetic defect centres in kaolinites might allow an efficient fingerprint of successive irradiations in the natural analogues under study and could be an useful tool to control radionuclides migration through kaolinite-containing clayey materials such as those used for waste repository. A better understanding of radiation efficiency as well as accurate dose-ratekaolinite-containing clayey materials such as those used for waste reposit estimation are needed for a quantitative tracing of the migration ofA better understanding of radiation efficiency as well as accurate dose-ratekaolin radionuclide elements. With this aim, a simulation has been undertaken withestimation are needed for a quantitative tracing of the migration of various radiations sources. We have determined for each irradiation the parameters of the paramagnetic centres created in order to understand the way they are forming. The knowledge of the parameters governing the formation and the stability of the radiation centres in kaolinites allow to use this mineral as a natural dosimeter.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/11/1990
• Auteurs : Jean-Marie AuzendeEiichi HonzaXavier BoespflugSatendra DeoJean-Philippe EissenJun HashimotoPhilippe HuchonJunichiro IshibashiYo IwabuchiPhilip JarvisMasato JoshimaKiyoyuki KisimotoYasuto KuwaharaYves LafoyTsuyoshi MatsumotoJean-Pierre MazeKiyohiko MitsuzawaHiroyasu MonmaTakeshi NaganumaYukihiro NojiriSuguru OhtaKiyoshi OtsukaYoshihisa OkudaHélène OndreasAkira OtsukiÉtienne RuellanMyriam SibuetManabu TanahashiTakeo TanakaTetsuro Urabe
• Organismes : Institut Français de Recherche pour l'Exploitation de la Mer Institut de Recherche pour le Développement Géosciences Environnement Toulouse Geological Survey of Japan
• Publié dans Marine Geophysical Research le 28/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 15/08/1990
• Auteurs : Bonnel PhilippePierre LefebvreBernard GilHenry MathieuChristiane DeparisJeans MassiesNeu GérardYong Chen
• Organismes : Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Groupe d'étude des semiconducteurs Centre de recherche sur l'hétéroepitaxie et ses applications Centre de recherche sur l'hétéroepitaxie et ses applications Centre de recherche sur l'hétéroepitaxie et ses applications Scuola Normale Superiore di Pisa
• Publié dans Physical Review B: Condensed Matter and Materials Physics (1998-2015) le 02/11/2020

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Résumé : Reflectance spectra are studied for both symmetric and asymmetric double-quantum-well structures separated by intermediate barriers with various thicknesses. It is shown that the interwell couplings versus the tunneling of the carriers across the barrier has a significant influence on the optical transition properties. Quantitative analyses are presented, which help to identify a number of transitions involving excited states, in asymmetric double wells. A theoretical model agrees with experimental results in several aspects: the interband transition energies, the transition probabilities, and the broadening of the reflectance structures. The effects of interfacial roughness and alloy disorder, in both symmetric and asymmetric systems, are carefully analyzed, which provides a new insight into the broadening of the optical transitions, due to interfacial morphology.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 08/07/1990
• Auteurs : Pierre BoherPhilippe HoudyLouis HennetJean-Pierre DelaboudiniereMikhael KuehnePeter MuellerZhigang LiDavid Smith
• Organismes : Laboratoire d'électronique de Philips Laboratoire d'électronique de Philips Laboratoire d'électronique de Philips Institut d'astrophysique spatiale

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