Philippe JEAN-PIERRE

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Pierre BouletJean-Luc DekeyserJean-Luc LevairePhilippe MarquetJulien SoulaAlain Demeure
• 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 Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille

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Résumé : Matrix manipulation programs are easily developed using a visual language. For signal processing, a graph of tasks operates on arrays. Each task iterates the same code on different patterns tilling these arrays. In this case visual specifications of dependencies between the pattern elements are enough to define an application. From the Array-OL language developed by Thomson Marconi Sonar, we propose a graphical environment, Gaspard, dedicated to the data-parallel paradigm. Only elementary SPMD tasks are textual. A full environment has been implemented including the graphical editor, a code transformer and a code generator for SMP computers.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Jean-Philippe BoulangerEdmée DurandJean-Philippe DuvelChristophe MenkesPascale DelécluseMaurice ImbardMatthieu LengaigneGurvan MadecSébastien Masson
• Organismes : Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire de Météorologie Dynamique (UMR 8539) Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie
• Publié dans Geophysical Research Letters le 25/10/2020

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Résumé : In March 1997, a strong westerly wind event (WWE) occurred in the western equatorial Pacific prior to the 1997-1998 E1 Nifio event. It produced downwelling Kelvin waves that interacted non linearly with the surface temperature, salinity and zonal current fronts located at the eastern edge of the warm-fresh pool (EEWP). This non-linear interaction locally increased zonal currents by a factor of three compared to a theoretical linear response, and advected the EEWP at an unexpected rate (-l m/s) to which the ocean-atmosphere coupled system may have been responding rapidly to trigger E1 Nino conditions.

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Fichiers liés : 2000GL012364.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Paul FontaynePhilippe SarrazinJean-Pierre Famose
• Organismes : Laboratoire de Psychologie des Pratiques Physiques Sport et Environnement Social Mouvement, Équilibre, Performance, Santé
• Publié dans European Journal of Sport Science le 22/10/2020

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Résumé : Within the framework of achievement motivation, the authors assessed gender and ethnic differences for preferential choices of social situations of achievement (e.g., academic, sport, art) and motivational goals pursued. A contents analysis of the essays of 202 pupils (boys and girls of Maghrebian and European origin) from a suburb of Paris was used. The subjects of Maghrebian origin tended to choose the school for social situations of achievement, while those of European origin appreciated the possibility for sport and art. Gender differences were more specifically pronounced for the Maghrebian girls. Concerning motivational goals, boys showed a less-marked orientation towards mastery goals than girls, whatever the social situation of achievement. Finally, the data analysis revealed that the nature of the social domain of achievement influences whether adolescents become intrinsically or extrinsically motivated.

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Fichiers liés : Fontayne_etal_EJSS_2001.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Bernhard NieswandtValerie SchulteWolfgang BergmeierRabée Mokhtari-NejadKirsten RackebrandtJean-Pierre CazenavePhilippe OhlmannChristian GachetHubert Zirngibl
• Organismes : Biologie et pharmacologie des plaquettes sanguines: hémostase, thrombose, transfusion Biologie et Pharmacologie des Plaquettes sanguines : hémostase, thrombose, transfusion
• Publié dans Journal of Experimental Medicine le 01/11/2020

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Résumé : Coronary artery thrombosis is often initiated by abrupt disruption of the atherosclerotic plaque and activation of platelets on the subendothelial layers in the disrupted plaque. The extracellular matrix protein collagen is the most thrombogenic constituent of the subendothelial layer; therefore, a selective inhibition of the collagen activation pathway in platelets may provide strong antithrombotic protection while preserving other platelet functions. Here we demonstrate that treatment of mice with a monoclonal antibody against the activating platelet collagen receptor glycoprotein VI (GPVI; JAQ1) results in specific depletion of the receptor from circulating platelets and abolished responses of these cells to collagen and collagen-related peptides (CRPs). JAQ1-treated mice were completely protected for at least 2 wk against lethal thromboembolism induced by infusion of a mixture of collagen (0.8 mg/kg) and epinephrine (60 microg/ml). The tail bleeding times in JAQ1-treated mice were only moderately increased compared with control mice probably because the treatment did not affect platelet activation by other agonists such as adenosine diphosphate or phorbol myristate acetate. These results suggest that GPVI might become a target for long-term prophylaxis of ischemic cardiovascular diseases and provide the first evidence that it is possible to specifically deplete an activating glycoprotein receptor from circulating platelets in vivo.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Bruno FrancoisJ. DebordPhilippe VignonJean-Pierre CharmesHervé GastinneLouis Merle
• Organismes : Service d'Accompagnement et Soins Palliatifs [CHU Limoges] Soins de Suite de Réadaptation Gériatrique [CHU Limoges] Service de Réanimation Polyvalente [CHU Limoges] Equipe de Recherche Médicale Appliquée

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Victor MalkaJérôme FaureJ.-R MarquèsFrançois AmiranoffJean-Philippe RousseauR. RanceJ.P. ChambaretZ. NajmudinB. WaltonP. MoraA. Solodov
• Organismes : Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Blackett Laboratory Blackett Laboratory Centre de Physique Théorique Centre de Physique Théorique
• Publié dans Physics of Plasmas le 02/11/2020

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Résumé : Detailed measurements of electron spectra and charges from the interaction of 10 Hz, 600 mJ laser pulses in the relativistic regime with a gas jet have been done over a wide range of intensities (10^18–2×10^19 W/cm^2) and electron densities (1.5×10^18–1.5×10^20 cm^−3), from the “classical laser wakefield regime” to the “self-modulated laser wakefield” regime. In the best case the maximum electron energy reaches 70 MeV. It increases at lower electron densities and higher laser intensities. A total charge of 8 nC was measured. The presented simulation results indicate that the electrons are accelerated mainly by relativistic plasma waves, and, to some extent, by direct laser acceleration.

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2001
• Auteurs : Jean-Pierre BrunPhilippe Jockey
• Organismes : Géosciences Rennes Université Paris Nanterre Archéologies et Sciences de l'Antiquité Archéologie des mondes grecs

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Jérôme VialardChristophe MenkesJean-Philippe BoulangerPascale DelécluseÉric GuilyardiMichael J. McphadenGurvan Madec
• Organismes : Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie
• Publié dans Journal of Physical Oceanography le 26/10/2020

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Chatrapatty BhugwantEmmanuel RiviérePhilippe KeckhutJean Leveau
• Organismes : Laboratoire de physique de l'atmosphère Laboratoire de physique de l'atmosphère Service d'aéronomie Laboratoire de physique de l'atmosphère
• Publié dans Tellus B - Chemical and Physical Meteorology le 22/10/2020

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Résumé : Black carbon (BC) was monitored during 1997-1999 in the lower troposphere of the southern Indian Ocean at La Réunion island (21.5°S, 55.5°E). BC concentrations obtained at Piton Textor, an altitude site (2150 m) representative of free troposphere, exhibited diurnal patterns and concentrations different from urban locations on the island, with maximum concentrations observed at daytime (~50-150 ng/m3) and minimum levels (~10-70 ng/m3) at night-time. BC diurnal variation is anti-correlated with diurnal ozone measured semi-continuously in parallel during 1998-1999, suggesting possible interaction of ozone and precursors (NO x , VOC, etc.) on carbonaceous aerosols, especially at night-time. Daytime BC enhancement may be explained by dynamical processes, due to updraught of air masses from lower levels to the troposphere, while at night-time, this process is reversed. Daytime ozone depletion is governed by photochemical processes, due to low precursor levels, while night-time ozone recovery is mainly driven by dynamical processes from upper tropospheric layers. Night-time BC and ozone in the lower troposphere show a marked seasonal pattern too, with minimum levels during austral summer (~15 ng/m3, 22 ppbv), secondary peaks in autumn and spring (~35 ng/m3, 36 ppbv) and maximum values during austral winter (~70 ng/m3, 41 ppbv) respectively. Night-time BC and ozone seasonalities are concordant with night-time radon seasonal trend in the lower troposphere, indicating that sampled air masses have mainly a marine origin in summer, off the African biomass burning season, and a continental origin in austral winter and spring. Winter and spring BC and ozone enhancement corroborate with fire-count maximum peaks observed over Africa and Madagascar, suggesting that the main cause is combustion products long-range transported in stable layers evidenced by thermodynamic analysis using 1996-1999 PTU soundings. These assessments are confirmed by 5-day backtrajectories, which show important seasonal shift in origin of air masses arriving in the lower troposphere of the southwestern Indian Ocean.

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Fichiers liés : Bhugwant_tellusb.pdf

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2001
• Auteurs : Jérôme HarmandF. MiensThierry ContePascal GrasPierre BuffièreJean-Philippe Steyer
• Organismes : Laboratoire de Biotechnologie de l'Environnement [Narbonne] Laboratoire de Biotechnologie de l'Environnement [Narbonne] Laboratoire de Biotechnologie de l'Environnement [Narbonne] Laboratoire de Biotechnologie de l'Environnement [Narbonne] Laboratoire de Biotechnologie de l'Environnement [Narbonne] Laboratoire de Biotechnologie de l'Environnement [Narbonne]

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