Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Philippe CattanStéphane RuyYves-Marie CabidocheAntoine FindelingPierre DesboisJean-Baptiste Charlier
• Organismes : Systèmes de Cultures Bananes, Ananas, et Plantains Unité Climat, Sol et Environnement Unité de Recherche AgroPédoClimatique de la zone caraïbe Recyclage et risque Unité Climat, Sol et Environnement Systèmes de Cultures Bananes, Ananas, et Plantains
• Publié dans Journal of Hydrology le 23/10/2020

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Résumé : Rainfall redistribution by plant canopy, notably the water flow down the plant stem (stemflow), modifies the incident rainfall rate at the soil surface and may affect runoff generation. To test this hypothesis, we observed and measured runoff at the plant scale with banana cultivated on tropical Andosol. Observation of runoff by video and matrix potential monitoring showed that, during a runoff event, the matrix potential increased mainly downstream from the pseudostem in line with the slope, delimiting a saturated zone of runoff propagation that appeared on video monitoring. The results indicate that rainfall redistribution by plant canopy, i.e. stemflow and dripping areas, enhances runoff even on soil with a high infiltration rate (mean hydraulic conductivity at saturation Ks of 67 mm h−1). Data analysis of 40 runoff events showed that events were composed of at least two runoff phases characterized by an abrupt increase in runoff coefficient (RC) from 0.16 to 0.65 between the first and the second phase. The change in RC was related to rainfall rate. Also, between the first and the second runoff phase, the apparent infiltration rate at the plot scale decreased from 30 to 10 mm h−1. This was related to an increase in runoff contributing areas (RCA), from an estimated 18% to 93% of the plot surface. However, data analysis and model simulations showed that the increase in mean rainfall rate in RCA due to stemflow was not sufficient to account for large runoff volumes. Hence, one must also take into account the spatial variation of hydraulic conductivity at saturation with low values relative to RCA (estimation for the second runoff phase was 7.6 mm h−1). Moreover, simulation results implied Ks decreases with time. Finally, rainfall redistribution may have an impact at a larger scale. In banana plantations, the hydraulic connectivity of runoff areas can enhance the stemflow effect up to the plot scale. From this point of view, the two-compartment scheme we chose for modeling could be applied at a larger scale: one compartment including stemflow and the relative water pathways and one compartment for the rest of the plot.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Khaldoun SalehYann H. KerrPhilippe RichaumeMaria Jose EscorihuelaR. PancieraS. DelwartGérard BouletPhilippe MaisongrandeJ. P. WalkerP. WursteisenWigneron J.-P.
• Organismes : University of Cambridge [Cambridge, UK] Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Department of Civil and Environmental Engineering [Melbourne] European Space Research and Technology Centre Centre d'études spatiales de la biosphère Centre d'études spatiales de la biosphère Department of Civil and Environmental Engineering European Space Research and Technology Centre Écologie fonctionnelle et physique de l'environnement
• Publié dans Remote Sensing of Environment le 28/10/2020

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Résumé : COSMOS (Campaign for validating the Operation of Soil Moisture and Ocean Salinity), and NAFE (National Airborne Field Experiment) were two airborne campaigns held in the Goulburn River catchment (Australia) at the end of 2005. These airborne measurements are being used as benchmark data sets for validating the SMOS (Soil Moisture and Ocean Salinity) ground segment processor over prairies and crops. This paper presents results of soil moisture inversions and brightness temperature simulations at different resolutions from dual-polarisation and multi-angular L-band (1.4 GHz) measurements obtained from two independent radiometers. The aim of the paper is to provide a method that could overcome the limitations of unknown surface roughness for soil moisture retrievals from L-band data. For that purpose, a two-step approach is proposed for areas with low to moderate vegetation. Firstly, a two-parameter inversion of surface roughness and optical depth is used to obtain a roughness correction dependent on land use only. This step is conducted over small areas with known soil moisture. Such roughness correction is then used in the second step, where soil moisture and optical depth are retrieved over larger areas including mixed pixels. This approach produces soil moisture retrievals with root mean square errors between 0.034 m3 m−3 and 0.054 m3 m−3 over crops, prairies, and mixtures of these two land uses at different resolutions.

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Fichiers liés : Saleh_RSE_09.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2009
• Auteurs : Philippe TeuletPierre FretonJean Jacques GonzalezAlain Gleizes
• Organismes : Arc Electrique et Procédés Plasmas Thermiques Arc Electrique et Procédés Plasmas Thermiques Arc Electrique et Procédés Plasmas Thermiques Centre interuniversitaire de recherche et d'ingénierie des matériaux LAboratoire PLasma et Conversion d'Energie

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : Tsevi MazehPascal GutermanSuzanne AigrainS. ZuckerN. GrinbergA. AlapiniRoi AlonsoMichel AuvergneMauro BarbieriPierre BargeP. BordéFrançois BouchyHans J. DeegR. de la RezaMagali DeleuilRudolf DvorakAnders EriksonMalcolm C. FridlundPhilippe GondoinLaurent JordaHelmut LammerAlain LégerAntoine LlebariaPierre MagainClaire MoutouMarc OllivierM. PätzoldFrédéric PontDidier QuelozHeike RauerDaniel RouanR. SaboJean SchneiderGünther Wuchterl
• Organismes : John Radcliffe Hospital [Oxford University Hospital] Laboratoire d'Astrophysique de Marseille University of Exeter Tel Aviv University Tel Aviv University University of Exeter Laboratoire d'Astrophysique de Marseille Laboratoire d'études spatiales et d'instrumentation en astrophysique Laboratoire d'Astrophysique de Marseille Laboratoire d'Astrophysique de Marseille Institut d'astrophysique spatiale Observatoire de Haute-Provence Instituto de Astrofisica de Canarias Observatório Nacional/MCTI Laboratoire d'Astrophysique de Marseille Institut für Astronomie, Universität Wien DLR Institut für Planetenforschung Research and Scientific Support Department, ESA-ESTEC Research and Scientific Support Department, ESA-ESTEC Laboratoire d'Astrophysique de Marseille Osterreichische Akademie der Wissenschaften = Académie autrichienne des sciences Institut d'astrophysique spatiale Laboratoire d'Astrophysique de Marseille Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich Laboratoire d'Astrophysique de Marseille Institut d'astrophysique spatiale Rheinisches Institut für Umweltforschung University of Exeter Observatoire Astronomique de l'Université de Genève DLR Institut für Planetenforschung Laboratoire Univers et Théories Laboratoire d'études spatiales et d'instrumentation en astrophysique Tel Aviv University Technical University of Berlin / Technische Universität Berlin Laboratoire Univers et Théories
• Publié dans Astronomy & Astrophysics - A&A le 28/10/2020

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Résumé : This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a function of stellar magnitude. We could find this effect only after preparing a set of learning light curves that were relatively free of stellar and instrumental noise. Correcting for this effect, rejecting outliers that appear in almost every exposure, and applying SysRem, reduced the stellar RMS by about 20%, without attenuating transit signals.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2009
• Auteurs : F. LoixLaurent OrgéasChristian GeindreauPierre BadelP. BoisseJean-Francis Bloch
• Organismes : Laboratoire sols, solides, structures - risques [Grenoble] Laboratoire sols, solides, structures - risques [Grenoble] Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] Laboratoire Génie des procédés papetiers
• Publié dans Composites Science and Technology le 30/10/2020

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• Type de publi. : Autre publication
• Date de publi. : 01/01/2009
• Auteurs : Philippe Moulis
• Organismes : Religions et croyances LAboratoire de Recherche Historique Rhône-Alpes - UMR5190

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Résumé : Victor Le Bouthillier (1596-1670) joua un rôle déterminant dans le diocèse de Boulogne-sur-Mer. Il donna l’impulsion nécessaire à la mise en place de la réforme catholique dans cet évêché. Son épiscopat est également important pour la compréhension de l’histoire du Jansénisme dans ce diocèse. L’historiographie “port-royaliste” a consacré Louis Macquet, curé et archidiacre du diocèse de Boulogne-sur-Mer, directeur et confesseur des Annonciades de cette même ville. Un proche de saint Vincent de Paul : François Perrochel, évêque de Boulogne-sur-Mer (1643-1675) d’après un manuscrit du début du XVIIIe siècle

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Fichiers liés : bepr_2009_11_moulis_trois_etudes.pdf

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2009
• Auteurs : Philippe Martin
• Organismes : Religions et croyances

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• Type de publi. : Article dans une revue
• Date de publi. : 29/12/2008
• Auteurs : Philippe JonnardKarine Le GuenJean-Michel André
• Organismes : Laboratoire de Chimie Physique - Matière et Rayonnement Laboratoire de Chimie Physique - Matière et Rayonnement Laboratoire de Chimie Physique - Matière et Rayonnement
• Publié dans X-Ray Spectrometry le 27/10/2020

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Résumé : Periodic multilayers are nowadays widely used to perform x-ray analysis in the soft x-ray range (photon energy lower than 1 keV). However, they do not permit to obtain high-resolution spectra like natural or synthetic crystals. Thus, multilayers cannot resolve interferences between close x-ray lines. It has been shown and demonstrated experimentally that patterning a grating profile within a multilayer structure leads to a diffractive optics with improved resolving power. We illustrate the use of a Mo/B4C multilayer grating in the Fe L and C K spectral ranges, around 700 eV and 280 eV respectively. First, in the Fe L range, the improved spectral resolution enables us to distinguish the Fe Lα and Lβ emissions (separated by 13 eV). In addition, using a sample made of a mix of LiF and an iron ore, we show that it is possible to easily resolve the F K and Fe L emissions. These examples demonstrate that an improved x-ray analysis can be obtained with multilayer gratings when there is the need to study samples having elements giving rise to close emission lines. Second, in the C K range, by comparing C Kα spectra from B4C and cellulose, we show that the shape of the emission band is sensitive to the chemical state of the carbon atom.

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Fichiers liés : MG_XRS09.pdf

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• Type de publi. : Pré-publication, Document de travail
• Date de publi. : 28/12/2008
• Auteurs : Pierre-Philippe CombesMiren LafourcadeJacques-François ThisseJean-Claude Toutain
• Organismes : Groupement de Recherche en Économie Quantitative d'Aix-Marseille Paris-Jourdan Sciences Economiques Paris-Jourdan Sciences Economiques Center of Operation Research and Econometrics [Louvain] Equipe de recherche sur les marches, l'emploi et la simulation

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Résumé : This paper uses a unique database that provides value-added, employment, and population levels for the entire set of French departments for the years 1860, 1930, and 2000. These data cover three sectors: agriculture, manufacturing, and services. This allows us to study the evolution of spatial inequalities within France and to test the empirical relevance of economic geography predictions over the long run. The evidence confirms the existence of a bell-shaped evolution of the spatial concentration of manufacturing and services. In contrast, labor productivity has been converging across departments. Last, our study also confirms the presence of strong agglomeration economies during the full time-period. Market potential during the first sub-period (1860-1930), and higher education during the second (1930-2000), together with sectoral diversity, account for the spatial distribution of these gains.

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Fichiers liés : DT2008-60.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 20/12/2008
• Auteurs : Mathieu P RoderoYannick MarieMathieu CoudertEmmeline BlondetKarima MokhtariAudrey RousseauWilliam RaoulCatherine CarpentierFlorian SennlaubPhilippe DeterreJean-Yves DelattrePatrice DebréMarc SansonC. Combadiere
• Organismes : Laboratory of neurogenetics and neuroinflammation Institut National Polytechnique de Lorraine Laboratoire Roche [Boulogne-Billancourt] CHU Pitié-Salpêtrière [AP-HP] CHU Pitié-Salpêtrière [AP-HP] Centre de Recherche des Cordeliers Institut du Cerveau = Paris Brain Institute Développement, vieillissement et pathologie de la rétine Centre d'Immunologie et de Maladies Infectieuses Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute Centre d'Immunologie et de Maladies Infectieuses CHU Pitié-Salpêtrière [AP-HP] Centre d'Immunologie et des Maladies Infectieuses
• Publié dans Journal of Clinical Oncology le 01/11/2020

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