Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : A.A. van de GriendWigneron J.-P.Philippe Waldteufel
• Organismes : Department of Hydrology and Geo-Environmental Sciences [Amsterdam] Station de bioclimatologie Service d'aéronomie
• Publié dans IEEE Transactions on Geoscience and Remote Sensing le 31/10/2020

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Résumé : The L-band (1.4 GHz) two-dimensional microwave interferometric radiometer, the payload of the Soil Moisture and Ocean Salinity (SMOS) mission, will observe elements of the Earth's surface simultaneously at multiple angles. Compared to single-angle observations, this multiangle observation technology is expected to significantly improve the capability of passive microwave remote sensing to retrieve soil moisture and vegetation properties from space. Although multiangle retrieval algorithms have been developed and successfully evaluated for homogeneous surfaces on the basis of simulation studies, the inherently large footprint of microwave observations from space has serious consequences for parameter retrieval from "real-world" inhomogeneous surfaces. At the spatial scale of SMOS (∼30 km for nadir observations), the Earth's surface is inhomogeneous almost by default. This aspect has not been fully accounted for yet. This study gives some insight into the consequences of vegetation spatial heterogeneity for the retrieval of "effective" surface parameters (soil moisture, canopy microwave transmissivity, and effective surface temperature) from inhomogeneous surfaces without prior knowledge of the within-pixel canopy heterogeneity.

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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 : M. BergerJordi FontWigneron J.-P.Jean-Christophe CalvetKauzar Saleh ContellErnesto Lopez-BaezaL. SimmondsPaolo FerrazzoliB. van den HurkPhilippe WaldteufelF. PetitcolinAdriaan van de Griend
• Organismes : European Space Research and Technology Centre Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] Unité de bioclimatologie Centre national de recherches météorologiques Unité de bioclimatologie Universitat de València = University of Valencia = Universidade de Valencia
• Publié dans ESA bulletin le 22/10/2020

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Pierre BouletJean-Luc DekeyserCedric DumoulinPhilippe MarquetPhilippe KajfaszDominique Ragot
• 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 Contributions of the Data parallelism to real time Laboratoire d'Informatique Fondamentale de Lille Contributions of the Data parallelism to real time

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Résumé : Complexity in the digital systems integration rises from the heterogeneity of the components integrated in a chip. The aim of the Sophocles project is to validate methodologies, platforms and technologies to support integration, verification and programming, over a distributed environment, of complex systems composed of heterogeneous virtual components. Several formalisms are gathered, according to their applicability, in order to immediately propose a framework of formal specification and validation of applications for SoCs. The unification of these formalisms in a modeling language facilitates the work of the users while guaranteeing a strong semantics on all the levels of the specification.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : E. DinJean-Pierre MilletPhilippe SteyerM. Abrudeanu
• Organismes : Matériaux, ingénierie et science [Villeurbanne] Matériaux, ingénierie et science [Villeurbanne]
• Publié dans Science Bulletin le 09/12/2014

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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 : 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. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Kim Ta PhuocAntoine RousseL. NotebaertM. PittmanJean-Philippe RousseauVictor MalkaS. FritzlerStéphane SebbanPh. BalcouD. HulinJ.-R MarquèsP. G. David
• Organismes : Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire d'Optique Appliquée Laboratoire pour l'utilisation des lasers intenses Laboratoire pour l'utilisation des lasers intenses
• Publié dans Journal of the Optical Society of America B le 30/10/2020

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Résumé : Polychromatic x-ray radiation has been produced during the relativistic interaction of a 50-TW femtosecond laser with a helium gas jet. We have characterized the spectrum and the angular distribution of the x-ray emission as well as its dependency on the laser polarization and on the plasma electronic density. We have observed a broad continuous spectrum peaking at 0.15 keV with a significant tail up to 2 keV. The radiation was fairly collimated.

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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 : Jean-Pierre AllegretBernard CourbisPhilippe Dulbecco
• Organismes : Groupe d'analyse et de théorie économique Centre d'Études et de Recherches sur le Développement International
• Publié dans Review of International Political Economy le 28/10/2020

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Résumé : Emerging economies, which have implemented since the end of the 80's a process of financial liberalization, are confronted at the same time to banking crisis. The latter highlight the role played by the institutional framework in the process of financial liberalization. The objective of this paper is to go through the usual alternative too much/ too little market in order to explain that the success of any liberalization process relies on the complementarity between market and intermediation. Institutions defined as rule-following behavior represented the cornerstone of such an evolution. The point is that the solution to financial instability is to be found within the institutional dynamics in which emerging economies may benefit from intermediation in order to enforce the market process.

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Fichiers liés : RIPE2002revised.pdf

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