Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Florence RaynalAurélien BeufFrédéric PlazaJulian F. ScottPhilippe CarrièreMichel CabreraJ.-P. CloarecÉliane Souteyrand
• Organismes : Laboratoire de Mecanique des Fluides et d'Acoustique Laboratoire de Mecanique des Fluides et d'Acoustique Laboratoire de Mecanique des Fluides et d'Acoustique Laboratoire de Mecanique des Fluides et d'Acoustique Laboratoire de Mecanique des Fluides et d'Acoustique INL - Lab-On-Chip et Instrumentation INL - Chimie et Nanobiotechnologies INL - Chimie et Nanobiotechnologies
• Publié dans Physics of Fluids le 02/11/2020

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Résumé : Numerical studies for two protocols of micromixing based on chaotic advection to improve DNA chip hybridization are presented. The first protocol uses syringes; the other one, pumps. For both protocols, numerical Poincaré sections and Lyapunov exponents of the three-dimensional, time-periodic flow are investigated as functions of the period. Model experiments also confirm numerical results. Homogeneity of the dispersion of particles inside the chamber is of primary importance to achieve best chip reliability: although global chaos was obtained for both protocols, we find that the one employing the pumps is more likely to achieve better and more rapid hybridization.

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Fichiers liés : Raynal_POF_2007.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Ivan FaveroAlice BerthelotGuillaume CassaboisChristophe VoisinClaude DelalandePhilippe RoussignolRobson FerreiraJ.-M. Gérard
• Organismes : Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Nanophysique et Semiconducteurs
• Publié dans Physical Review B: Condensed Matter and Materials Physics (1998-2015) le 02/11/2020

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Résumé : We report systematic measurements on the broadening of the emission spectrum of single quantum dots as a function of temperature and incident power. Spectral diffusion effects in the motional narrowing regime provide a quantitative interpretation of our experimental results. We show that, at low incident power, the thermal activation of spectral diffusion results in a Lorentzian zero-phonon line with a width that increases linearly with temperature. Our study provides a unified interpretation to the widely debated issue of the dispersion of the data on the temperature dependence of this zero-phonon linewidth. Our explanation is based on an original model where acoustic phonons interact with carriers outside the quantum dot.

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Fichiers liés : Cassabois.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Philippe BriandJean-Pierre LepeltierJaime San Martin
• Organismes : Institut de Recherche Mathématique de Rennes Laboratoire de Statistique et Processus Centre de modélisation mathématique / Centro de Modelamiento Matemático [Santiago] Departamento de Ingeniería Matemática [Santiago] Centre de modélisation mathématique / Centro de Modelamiento Matemático [Santiago]
• Publié dans Bernoulli le 28/10/2020

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Résumé : In this paper we study one-dimensional BSDE's whose coefficient f is monotonic in y and non-Lipschitz in z. We obtain a general existence result when f has at most quadratic growth in z and is bounded. We study the special case f (t, y, z) = vertical bar z vertical bar(p) where p is an element of (1, 2]. Finally, we study the case f has a linear growth in z, general growth in y and is not necessarily bounded.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Philippe Bordes
• Organismes : Art, images, sociétés
• Publié dans Cahiers parisiens - Parisian Notebooks le 18/12/2007

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• Type de publi. : Rapport
• Date de publi. : 01/01/2007
• Auteurs : Marie-Helene JeuffroyPhilippe LucasDavid MakowskiJean-Marc MeynardMarie-Pierre PlanckeJean-Paul Bordes
• Organismes : Agronomie Biologie des organismes et des populations appliquées à la protection des plantes Agronomie Département Sciences pour l'Action et le Développement Monsanto International ARVALIS - Institut du végétal [Paris]

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Résumé : Take-all of wheat is caused by a soil-borne fungus (Gaeumannomvces gramlnls var.trltld), which attacks the roots and develops in patches, It is one of the most cammon wheat diseases, notably affecting second and third crops of wheat, leading to major yield losses. Its development depends on numerous factors linked to crop sequences, cultivation techniques, climate and soil type. So far, growers have limited options to prevent the severity of damage caused by take-all to winter wheat crops. Chemical control methods exist, based on the treatment of seeds but have partial efficacy only. Some cultivation techniques are known to reduce take-all incidence and severity and limit its impact on yield but none of them constitutes an efficient method of control on itself. To achieve economically Significant control of this disease, there is thus a need for combining appropriate techniques (cropping practices, fungicide treatment), although with partial efficacy, but showing complementary effects in order to achieve efficient management strategies. Up to now, no decision making tool has been developed to define such management strategy leading to integrated control of take-all of wheat. INRA scientists have used a database containing information from 2S experiments where 2 to 24 cropping systems were tested between 1992 and 2003, to develop 16 models which could predict the incidence of the disease as a function of variables related to the cropping system, soil and climate. They finally chose only three of these models for practical use. These models were combined with a yield simulation module calculating yield loss as a function of the incidence of take-all of wheat. The full models were then used to illustrate a series of applications aimed at answering practical questions which would be of interest to technical institutes and crop protection advisors, such as: the planning of fungicide treatments, comparison of the impact of different crop sequences or crop management on Incidence of the disease and yield losses. These models simulate the dynamics of the disease at the field scale and enable identification of the combinations of farming practices which could limit the effects of take-all, even in a situation favourable to the disease. In order to render the crop less vulnerable to disease and only use chemical control when absolutely necessary

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Jean-Pierre AllegretPhilippe Dulbecco
• Organismes : Groupe d'analyse et de théorie économique Centre d'Études et de Recherches sur le Développement International
• Publié dans Review of International Organizations le 22/10/2020

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Résumé : The conditionality employed by the International Monetary Fund (IMF) in its lending policy is one of the main themes of controversy in the debate on the new international financial architecture. The purpose of this paper is to propose an analytical framework integrating the diverse explanations of the failure of IMF conditionality. Our analysis is based on the idea that the IMF is a key player in the running of markets in a global economy. More precisely, we explain that most of the criticisms concerning conditionality should be analyzed through what we agree to call the institutional failures of IMF conditionality. These institutional failures must be appreciated at two complementary levels: the first level refers to the intrinsic bureaucratic bias of the IMF while the second deals with the inability of the IMF to manage the institutional change required for the development of market processes and hence to maintain the institutional order in recipient countries. Although the first level failures have been particularly well studied via the international public choice approach, those of the second are, at best, often reduced to a simple statement. However, analyzing both levels of institutional failure of the IMF together is not without implications for the way in which the reforms of conditionality are conceived. Indeed, by including an analysis of the second level of failures, i.e. those relating to the relationship between conditionality and domestic institutional change, the recommendation of ex-ante conditionality emanating from the public choice approach, which tackles the first level of failures, will be invalidated. Instead a new approach will be proposed that suggests the separation of the role of the IMF as financial backer from its role as adviser to countries confronted by the globalization process.

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Fichiers liés : Allegret_Dulbecco_RIO_Revision_Sept06.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2007
• Auteurs : Eric GloaguenYannick BranquetPhilippe BoulvaisY. MoëloJean-Jacques ChauvelP.J. ChiapperoEric Marcoux
• Organismes : Institut des Sciences de la Terre d'Orléans Bureau de Recherches Géologiques et Minières (BRGM) Institut des Sciences de la Terre d'Orléans Géosciences Rennes Institut des Matériaux Jean Rouxel Géosciences Rennes Minéralogie, Pétrologie Institut des Sciences de la Terre d'Orléans
• Publié dans Mineralium Deposita le 31/10/2020

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Résumé : In the Saint-Aubin-des-Châteaux quarry (Armorican Hercynian belt, western France), an epigenetic hydrothermal alteration affects an oolitic ironstone layer intercalated within the Lower Ordovician Grès armoricain Formation. The hydrothermal overprint produced pervasive and massive sulphidation with stratoid pyritized lenticular bodies within the oolitic ironstone layer. These sulphide lenses are spatially associated with strike-slip faults and extend laterally from them. Following the massive sulphidation stage (Fe-As, stage 1), subsequent fracturing allowed the deposition of base metals (stage 2) and Pb-Sb-Au (stage 3) parageneses in veins. The dominant brittle structures are vertical extension veins, conjugate shear veins and strike-slip faults of various orders. All these structures are filled with the same paragenetic sequence. Deformation analysis allows the identification of structures that developed incrementally via right lateral simple shear compatible with bulk strain affecting the Central Armorican Domain. Each increment corresponds to a fracture set filled with specific parageneses. Successive hydrothermal pulses reflect clockwise rotation of the horizontal shortening direction. Geothermometry on chlorite and arsenopyrite shows an input of hot hydrothermal fluids (maximum of 390-350°C) during the main sulphide stage 1. The subsequent stages present a marked temperature drop (300-275°C). Lead isotopes suggest that the lead source is similar for all hydrothermal stages and corresponds to the underlying Neo-proterozoic basement. Lead isotope data, relative ages of deformation and comparison with neighbouring deposits suggest large-scale fluid pulses occurred during the whole Hercynian orogeny rather than pulses restricted to the late Hercynian period. The vicinity of the Hercynian internal domain appears as a key-control for deformation and fluid flow in the oolitic ironstones which acted as a chemical and structural trap for the hydrothermal fluids. The epigenetic mineralization of Saint-Aubin-des-Châteaux appears to be very similar to epigenetic sulphidation described in BIF-hosted gold deposits.

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Fichiers liés : Gloaguen-MineraliumDeposita-2007.pdf

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Bernard MourrainJean-Pascal PavonePhilippe TrébuchetElias TsigaridasJulien Wintz
• Organismes : Geometry, algebra, algorithms Geometry, algebra, algorithms Systèmes Polynomiaux, Implantation, Résolution Algébrique Department of Informatics and Telecomunications [Kapodistrian Univ] Geometry, algebra, algorithms

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Résumé : We present an overview of the open source library synaps. We describe some of the representative algorithms of the library and illustrate them on some explicit computations, such as solving polynomials and computing geometric information on implicit curves and surfaces. Moreover, we describe the design and the techniques we have developed in order to handle a hierarchy of generic and specialized data-structures and routines, based on a view mechanism. This allows us to construct dedicated plugins, which can be loaded easily in an external tool. Finally, we show how this design allows us to embed the algebraic operations, as a dedicated plugin, into the external geometric modeler axel.

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Fichiers liés : paper.pdf

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• Type de publi. :
• Date de publi. : 01/01/2007
• Auteurs : Jean-Yves SalpinRiccardo SpeziaMarie-Pierre GaigeotJeanine TortajadaD. ScuderiJoël LemairePhilippe Maıtre
• Organismes : Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement Laboratoire Analyse et Modélisation pour la Biologie et l'Environnement Laboratoire de Chimie Physique D'Orsay Laboratoire de Chimie Physique D'Orsay Laboratoire de Chimie Physique D'Orsay

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• Type de publi. : Chapître d'ouvrage
• Date de publi. : 01/01/2007
• Auteurs : Jean-Philippe Pernin
• Organismes : Modèles et Technologies pour l’Apprentissage Humain

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