Philippe JEAN-PIERRE

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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. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Philippe LeclèreF. DubourgSophie MarsaudonJ. L. BredasR. LazzaroniJean-Pierre Aimé
• Organismes : Université de Mons-Hainaut Centre de physique moléculaire optique et hertzienne Centre de physique moléculaire optique et hertzienne Université de Mons-Hainaut University of Arizona Université de Mons-Hainaut Centre de physique moléculaire optique et hertzienne

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Résumé : Dynamic force microscopy is known for its ability to image soft materials without inducing severe damage. For such materials, the determination of the relative contributions of the topography and the local mechanical properties to the recorded image is of primary importance. In this paper, we show that a systematic comparison between images and approach–retract curve data allows the origin of the contrast to be straightforwardly evaluated. The method provides an unambiguous quantitative measurement of the contribution of the local mechanical response to the image. To achieve this goal, experimental results are recorded on a model system, a symmetric triblock copolymer, which possesses a lamellar morphology due to nanophase separation between elastomer and glassy domains. In this particular case, we show that most of the contrast in the height and phase images is due to variations of the local mechanical properties. As a step further, the analysis of the variation of the phase is carried out as a function of the tip–surface distance. Local variations of the phase can be linked to dissipative processes between the tip and the soft sample. When the tip touches the surface, viscous forces acting against the tip motion contribute to the phase lag. Depending on the tip apex geometry and on the nature of the sample, the relationships between the phase variations and the tip–surface distance can be derived. On that basis, we propose an approach to evaluate the viscosity at the nanometer scale.

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Fichiers liés : Leclere2001.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Max AmatoFrancis LemoineJean GonzalesChristian SchmidtPhilippe AfriatPierre Louis Bernard
• Organismes : Euromov
• Publié dans Annales de Réadaptation et de Médecine Physique le 24/10/2020

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• Type de publi. : Rapport
• Date de publi. : 01/01/2001
• Auteurs : Philippe AntoineAbdou Salam FallAgnès AdjamagboAlioune DiagneFatou Binetou-DialLaure MoguérouAmadou Lamine Ndiaye
• Organismes : Laboratoire Population-Environnement-Développement Systèmes répartis et coopératifs Institut de Recherche pour le Développement Institut de Recherche pour le Développement Cultures anglo-saxonnes

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2001
• Auteurs : Philippe BiaginiPierre GallianHoussam AttouiMhammed TouinssiJean-François CantaloubePhilippe de MiccoXavier de Lamballerie
• Organismes : Virologie UMR1161
• Publié dans Journal of General Virology le 01/11/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Sinan HaliyoYves RollotStéphane RégnierPhilippe BidaudJean-Claude Guinot
• Organismes : Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris Laboratoire de Robotique de Paris

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2001
• Auteurs : Jean-Pierre Le CromPhilippe-Jean Hesse
• Organismes : Maison des Sciences de l'Homme Ange-Guépin Droit et changement social

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Y. NouaillePhilippe SauvageL VeroneseLouis MerleJean-Pierre CharmesThierry Dantoine
• Organismes : Service de Pharmacologie, toxicologie et pharmacovigilance [CHU Limoges] Equipe de Recherche Médicale Appliquée Soins de Suite de Réadaptation Gériatrique [CHU Limoges] Handicap, Activité, Vieillissement, Autonomie, Environnement

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

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Résumé : Gaspard is a visual programming environment devoted to the development and control of scientific parallel applications. par The two paradigms of parallel programming (task and data parallelism) are mixed in Gaspard: a hierarchy of task graphs operates on array flows. These two levels are mixed in a common metaphor. An application is designed as a printed circuit: the programmer specifies tasks as boards or chips and instantiates tasks by plugging them into slots. par The number crunching applications developped using Gaspard are deployed on metacomputing platforms. The visual specification of the application mapping may be dynamically modified at runtime according to the information provided by Gaspard.

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2001
• Auteurs : Thierry DantoineBruno FrançoisJ. DebordPhilippe VignonJean-Pierre CharmesHervé GastinneLouis Merle
• Organismes : Handicap, Activité, Vieillissement, Autonomie, Environnement Service d'Accompagnement et Soins Palliatifs [CHU Limoges] Service de Réanimation Polyvalente [CHU Limoges] 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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