Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Hassan BencherifThierry PortafaixJean-Luc BarayBéatrice MorelSerge BaldyJean LeveauAlain HauchecornePhilippe KeckhutAshokabose MoorgawaMax M. MichaelisR. Diab
• Organismes : Laboratoire de l'Atmosphère et des Cyclones Laboratoire de l'Atmosphère et des Cyclones Laboratoire de l'Atmosphère et des Cyclones Université de La Réunion - Faculté des Sciences et Technologies Laboratoire de l'Atmosphère et des Cyclones Laboratoire de l'Atmosphère et des Cyclones Service d'aéronomie Service d'aéronomie University of KwaZulu-Natal [Durban, Afrique du Sud] University of KwaZulu-Natal [Durban, Afrique du Sud] University of KwaZulu-Natal [Durban, Afrique du Sud]
• Publié dans Journal of Atmospheric and Solar-Terrestrial Physics le 01/11/2020

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Résumé : The study of the variability of stratospheric aerosols and the transfer between the diierent atmospheric regions improves our understanding of dynamical processes involved in isentropic exchanges that take place episodically in the lower stratosphere through the subtropical barrier. One useful approach consists in combining in situ ground-based and global measurements with numerical analyses. The present paper reports on a case study of a horizontal transfer evidenced ÿrst by Rayleigh–Mie LIDAR observations over Durban (29:9 • S, 31:0 • E, South Africa). Additional data from MeteoSat and SAGE-2 experiments, and from ECMWF meteorological analysis have been used in this study. Contour advection maps of potential vorticity from the MIMOSA model derived from ECMWF ÿelds, were also used. By the end of April, 1999, LIDAR observations showed that aerosol extinction, in the lower stratosphere, has increased signiÿcantly and abnormally in comparison with other LIDAR and SAGE-2 observations recorded for the period from April 20 to June 14, 1999. The dynamical context of this case study seems to exclude the possibility of a local innuence of the subtropical jet stream or tropical convection, which could inject air masses enriched with tropospheric aerosols into the stratosphere. On the contrary, a high-resolution model based on PV advection calculations and ECMWF meteorological analyses shows that air masses are isentropically advected from the equatorial zone close to Brazil. They cross the southern barrier of the tropical reservoir due to laminae stretching and reach the southern subcontinent of Africa 5–6 days later.

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Fichiers liés : Bencherif et al, JASTP 2003_hal.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Eric AllègrePhilippe Dessus
• Organismes : Centre de Recherches en Education Formation et Insertion de Toulouse Laboratoire des Sciences de l'Éducation (Grenoble)

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Résumé : Nous présentons les fonctionnalités et les premiers tests d’un système d’observation et d’analyse de séances d’enseignement, en direct. Nous montrons que ce système prend mieux en compte certains paramètres importants des situations scolaires que les méthodes d’observation classiques, comme leur temporalité complexe et le fait que les actions de l’enseignant et des élèves ne sont pas seulement dépendantes de l’action qui précède.

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Fichiers liés : epique03.PDF

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Charles Martin-KrummPhilippe SarrazinChristopher PetersonJean-Pierre Famose
• Organismes : Centre de Recherche sur l'Education, les apprentissages et la didactique Sport et Environnement Social Department of Psychology Mouvement, Équilibre, Performance, Santé
• Publié dans Personality and Individual Differences le 27/10/2020

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Résumé : Some athletes habitually explain bad events with causes that are stable in time and global in effect, and explain good events with causes that are unstable and specific. This pessimistic explanatory style constitutes a dispositional risk factor likely to lead to lower expectations of success, to increased anxiety, and to poor achievement. 62 participants (mean age 14 years) performed a basketball dribbling trial and were given false feedback indicating that they had failed. Consistent with prediction, in a second trial, the optimistic participants (N = 22) were less anxious (assessed by heart rate acceleration), more confident, and performed better than pessimistic participants (N = 20). A third group with a neutral explanatory style (N = 20) obtained scores which were between the two other groups.

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Fichiers liés : Martin-Krumm_et_al_PAID_2003.pdf

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2003
• Auteurs : Thérèse EncrenazJean-Pierre BibringMichel BlancMaria Antonietta BarucciFrançoise RoquesPhilippe Zarka
• Organismes : Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Pôle Planétologie du LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Pôle Planétologie du LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Pôle Planétologie du LESIA Laboratoire d'études spatiales et d'instrumentation en astrophysique Physique des plasmas Pôle Planétologie du LESIA

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : M. PardéWigneron J.-P.André ChanzyPhilippe WaldteufelYann H. KerrS. Huet
• Organismes : Station de bioclimatologie Station de bioclimatologie INRA CSE Service d'aéronomie Centre d'études spatiales de la biosphère Unité de biométrie et intelligence artificielle de Jouy
• Publié dans Remote Sensing of Environment le 28/10/2020

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Résumé : The main objective of the Soil Moisture and Ocean Salinity (SMOS) mission over the land surface is to monitor surface soil moisture (SM) from measurements of the microwave emission at L-band. These measurements will be done at many incidence angles and two polarizations. The multiconfiguration system of SMOS provides the possibility to retrieve one or several surface parameters in addition to soil moisture. Such an approach, referred to as N-parameter retrievals (where N is the number of retrieved parameters), could make the retrieval process more efficient. In this study, this possibility was investigated using an experimental dataset acquired over a wheat field. First, a detailed analysis of the attenuation properties of the wheat canopy, a vertical-stem dominated crop, was made. The results showed that the polarization and incidence angle dependence of attenuation was very significant and could be accurately modeled using only two parameters: the optical depth τ at nadir (τ(θ=0)) and a polarization parameter (Cpol). The need for this latter parameter results from the difference in the dielectric properties of wheat for the vertical and horizontal polarizations. Based on these results, a detailed comparison of different soil moisture retrieval approaches was made. One-, two-, and three-parameter retrieval approaches were tested. In this latter method, soil moisture and the two vegetation parameters (τ(θ=0) and Cpol) were retrieved simultaneously. This method was found to be the most efficient: it provided the best accuracy in the SM retrievals and it did not require ancillary information on the vegetation characteristics, which cannot be easily estimated for operational SM mapping applications.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Philippe BotellaFrançois CansellTh. JaszayJean-Pierre FrayretMarie-Hélène Delville
• Organismes : Institut de Chimie de la Matière Condensée de Bordeaux Institut de Chimie de la Matière Condensée de Bordeaux Laboratoire de mécanique des fluides Laboratoire de Mécanique Physique Institut de Chimie de la Matière Condensée de Bordeaux
• Publié dans Journal of Supercritical Fluids le 26/10/2020

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Résumé : Electrochemical data concerning metallic materials submitted to aqueous media at high pressures and high temperatures, which are close to the critical point, are scarce. This is essentially due to the difficulties encountered during the setting-up of an appropriate system of analysis. This paper, in the peculiar context of organic wastes supercritical water oxidation, proposes, for both sub and supercritical conditions, some technical solutions to define a cell able to give access to quantitative electrochemical information. For special media (pH≥1.7 and chloride ions content≈1 g/l), using a specific device consisted of a TA6V electrochemical cell, ensuring lasting and chemically inert electrical isolation and water tightness, along with a hydrogen dynamic electrode (HDE), it is possible to obtain reliable ‘current–potential' curves allowing a quantitative exploitation, particularly for corrosion rates determination.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Matthieu LengaigneJean-Philippe BoulangerChristophe MenkesGurvan MadecPascale DelécluseÉric GuilyardiJulia Slingo
• 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 CGAM CGAM
• Publié dans Journal of Climate le 02/11/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Jean-Gabriel GanasciaPhilippe Breton
• Organismes : Apprentissage et Acquisition des connaissances

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Philippe BourdeauJean CorneloupPascal Mao
• Organismes : Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales Pacte, Laboratoire de sciences sociales
• Publié dans Teoros. Revue de recherche en tourisme le 21/10/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Julien CharreauYan ChenStuart A. GilderJean‐philippe AvouacStéphane DominguezŞevket Şen
• Organismes : Institut des Sciences de la Terre d'Orléans Institut des Sciences de la Terre d'Orléans Institut de Physique du Globe de Paris Caltech Division of Geological and Planetary Sciences Laboratoire Dynamique de la Lithosphère Paléobiodiversité et paléoenvironnements

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Résumé : In order to better constrain the Tertiary reactivation of the different mountain ranges in Central Asia under the influence of the India-Asia collision, we carried out a magnetostratigraphic study along the Kuitun He section on the northern flank of the Tian Shan range. The Kuitun He section is composed of upper Tertiary sediments that were folded in a ramp anticline, then incised by a Holocene river. Sediment deposition was likely coeval with the building of the Tian Shan mountains, which coincided with major climatic change across Central Asia. About 1200 core samples were collected along the 2000-m-thick section, which is composed mainly of sandstone and conglomerate. In the laboratory, we performed both thermal and AF demagnetization, as well as magnetic mineralogical studies such as IRM, magnetic hysteresis, Curie point analyses, etc. Preliminary results show that magnetite is the main carrier of the magnetic remanence. A tenth of magnetic polarity intervals have been identified along the section. Preliminary correlation of this polarity sequence with the reference curve suggests an age span between 7 and 3 Myr with an average sedimentation rate of about 0.4 mm/yr. The high sedimentation rate can be interpreted in terms of facies migration, which owes to both tectonic and climatic forcing. The overall mean direction shows no significant inclination shallowing as is generally observed in Tertiary sediments throughout Central Asia.

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