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Search Results: 1 - 10 of 400823 matches for " M. Jamet "
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A presentation of main methods of evaluating CSLE in cognitive psychology
STICEF , 2006,
Abstract: The aim of this article is to present a series of methods used in cognitive psychology to evaluate CSLE. In this field of study, the use of experimental methods and the gathering of various behavioural indices make it possible to obtain objective indicators of the effectiveness for learning of a CEHL. After theorical elements relative to learning, we will present the evaluation tools that are most frequently used in this field while distinguishing between measurements taken before or after learning.
La discordance des temporalités dans la justice des mineurs Discordant temporalities in the youth justice sector Discordancia de las temporalidades en la justicia para menores
Ludovic Jamet
La Nouvelle Revue du Travail , 2012,
Abstract: Cet article interroge les évolutions des logiques temporelles d’action du secteur de la justice des mineurs. Ce secteur de l’action publique a connu de multiples évolutions au cours des deux dernières décennies. De nouveaux dispositifs (procédures, services de milieu ouvert, centres de placement, etc.) sont apparus, fondés chacun sur des logiques temporelles d’action particulières qui véhiculent leurs propres principes techniques. La confrontation de ces différentes logiques aboutit à une discordance des temporalités dans la justice des mineurs qui affecte le travail des principaux acteurs de ce secteur et qui occasionne un risque pour la cohérence même de cette action collective. The article asks how temporal logics of action have evolved in the field of youth justice, a sector of public action that has experienced a whole host of changes over the past 20 years. New mechanisms (procedures, open rehabilitation services, placement centres, etc.) have appeared in this time, each grounded in the temporal logic of a particular action that conveys its own technical principles. The clash between these various logics has created discordant temporalities within the youth justice sector. In turn, this affects the work of its principal actors and undermines the coherence of collective action. En este artículo, el autor se interroga sobre las evoluciones de las lógicas temporales de acción en el sector de la justicia para menores. Este sector de la acción pública ha evolucionado considerablemente a lo largo de los últimos veinte a os con la aparición de nuevos dispositivos (procedimientos, servicios de régimen abierto, centros de internamiento, etc.), cada uno de ellos basado en lógicas temporales de acción particulares que vehiculan sus propios principios técnicos. La confrontación de esas distintas lógicas conduce a una discordancia de las temporalidades en la justicia para menores que afecta el trabajo de los principales actores de ese sector y que conlleva riesgos para la coherencia misma de esa acción colectiva.
Obituary: Rafael Pont-Lezica (1940–2011)
Elisabeth Jamet
Frontiers in Plant Science , 2011, DOI: 10.3389/fpls.2011.00086
Sections hyperplanes et endomorphismes de l'espace projectif
Guillaume Jamet
Mathematics , 2001, DOI: 10.1016/S0764-4442(97)83579-3
Abstract: We show that any hyperplane section of a variety which is the inverse image of a smooth variety of dimension at least 2 by an endomorphism (wich is not an automorphism) of the projective space, is linearly complete. We stress the case of smooth surfaces in projective fourspace.
Differential forms and smoothness of quotients by reductive groups
Guillaume Jamet
Mathematics , 2000,
Abstract: In this paper we give smoothness criterions for a good quotient Y of a smooth variety X by a reductive group G. Our results partially answer a question raised by J. Fogarty in the case where G is a finite group. They also give a converse to a theorem of M. Brion, telling that invariant horizontal differential forms on X and differential forms on Y are isomorphic under the assumption that Y is smooth. The proof of our criterion rely on a new description of the dualizing sheaf of Y established in this article.
Structure and Magnetism of well-defined cobalt nanoparticles embedded in a niobium matrix
M. Jamet,V. Dupuis,P. Melinon,A. Perez,W. Wernsdorfer,A. Traverse,B. Baguenard
Physics , 2000, DOI: 10.1103/PhysRevB.62.493
Abstract: Our recent studies on Co-clusters embedded in various matrices reveal that the co-deposition technique (simultaneous deposition of two beams : one for the pre-formed clusters and one for the matrix atoms) is a powerful tool to prepare magnetic nanostructures with any couple of materials even though they are miscible. We study, both sharply related, structure and magnetism of the Co/Nb system. Because such a heterogeneous system needs to be described at different scales, we used microscopic and macroscopic techniques but also local selective absorption ones. We conclude that our clusters are 3 nm diameter f.c.c truncated octahedrons with a pure cobalt core and a solid solution between Co and Nb located at the interface which could be responsible for the magnetically inactive monolayers we found. The use of a very diluted Co/Nb film, further lithographed, would allow us to achieve a pattern of microsquid devices in view to study the magnetic dynamics of a single-Co cluster.
Micro-SQUID technique for studying the temperature dependence of switching fields of single nanoparticles
C. Thirion,W. Wernsdorfer,M. Jamet,V. Dupuis,P. Melinon,A. Perez,D. Mailly
Physics , 2001, DOI: 10.1016/S0304-8853(01)01130-1
Abstract: An improved micro-SQUID technique is presented allowing us to measure the temperature dependence of the magnetisation switching fields of single nanoparticles well above the critical superconducting temperature of the SQUID. Our first measurements on 3 nm cobalt nanoparticle embedded in a niobium matrix are compared to the Neel Brown model describing the magnetisation reversal by thermal activation over a single anisotropy barrier.
Calculation method of spin accumulations and spin signals in nanostructures using spin resistors
W. Savero Torres,A. Marty,P. Laczkowski,L. Vila,M. Jamet,J-P. Attané
Physics , 2015,
Abstract: The understanding and calculation of spin transport are essential elements for the development of spintronics devices. Here, we propose a simple method to calculate analytically the spin accumulations, spin currents and magnetoresistances in complex systems. This can be used both for CPP experiments in multilayers and for multiterminal nanostructures made of semiconductors, oxides, metals and carbon allotropes.
Magnetic Anisotropy of a Single Cobalt Nanoparticle
M. Jamet,W. Wernsdorfer,C. Thirion,D. Mailly,V. Dupuis,P. Melinon,A. Perez
Physics , 2000, DOI: 10.1103/PhysRevLett.86.4676
Abstract: Using a new microSQUID set-up, we investigate magnetic anisotropy in a single 1000-atoms cobalt cluster. This system opens new fields in the characterization and the understanding of the origin of magnetic anisotropy in such nanoparticles. For this purpose, we report three-dimensional switching field measurements performed on a 3 nm cobalt cluster embedded in a niobium matrix. We are able to separate the different magnetic anisotropy contributions and evidence the dominating role of the cluster surface.
Tiling a Pyramidal Polycube with Dominoes
Olivier Bodini,Damien Jamet
Discrete Mathematics & Theoretical Computer Science , 2007,
Abstract: The notion of pyramidal polycubes, namely the piling-up of bricks of a non-increasing size, generalizes in n the concept of trapezoidal polyominoes. In the present paper, we prove that n-dimensional dominoes can tile a pyramidal polycube if and only if the latter is balanced, that is, if the number of white cubes is equal to the number of black ones for a chessboard-like coloration, generalizing the result of [BC92] when n=2
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