Search results for "tiques"
showing 10 items of 1274 documents
Bayesian classification for dating archaeological sites via projectile points
2021
Dating is a key element for archaeologists. We propose a Bayesian approach to provide chronology to sites that have neither radiocarbon dating nor clear stratigraphy and whose only information comes from lithic arrowheads. This classifier is based on the Dirichlet-multinomial inferential process and posterior predictive distributions. The procedure is applied to predict the period of a set of undated sites located in the east of the Iberian Peninsula during the IVth and IIIrd millennium cal. BC.
Lieb polariton topological insulators
2018
We predict that the interplay between the spin-orbit coupling, stemming from the TE-TM energy splitting, and the Zeeman effect in semiconductor microcavities supporting exci- ton-polariton quasi-particles results in the appearance of unidirectional linear topological edge states when the top microcavity mirror is patterned to form a truncated dislocated Lieb lattice of cylindrical pillars. Periodic nonlinear edge states are found to emerge from the linear ones. They are strongly localized across the interface and they are remarkably robust in comparison to their counterparts in hexagonal lattices. Such robustness makes possible the existence of nested unidirectional dark solitons that move …
Correspondencias de carácteres de grupos finitos
2010
Uno de los problemas fundamentales de la Teoría de Caracteres es la Conjetura de McKay. La Conjetura de McKay afirma que si G un grupo finito, p un primo, y P un p-subgrupo de Sylow de G, entonces existe una biyección entre el conjunto $Irr_{p'}(G)$ de los caracteres complejos irreducibles de G de grado no divisible por p y el conjunto $Irr_{p'}(N)$, donde N es el normalizador de P en G. En general, no se conocen correspondencias canónicas entre estos dos conjuntos, incluso cuando G es resoluble. Sin embargo, bajo ciertas condiciones, sí se han encontrado correspondencias canónicas. En concreto, se han encontrado correspondencias canónicas entre estos dos conjuntos bajo las siguientes hipót…
Learning multiresolution: Transformaciones Multiescala derivadas de la teoría estadística de aprendizaje y aplicaciones
2010
Signal and image processing has become an essential and ubiquitous part of contemporary scienti¯c and technological activity, and the signals and images that need to be processed appear in most sectors of modern life. Signal processing is used in telecommunications, in the transmission of satellite images, and in medical imaging like echography, tomography, and nuclear magnetic resonance. Also it used in applications in Physics, Mechanics and other important issues that nowadays we know and that we will know in the future. Multiscale representations of signals into wavelets bases have been suc- cessfully used in applications such as compression and denoising. In these applications, one esse…
Génération de supercontinuum infrarouge et enjeux de vieillissement au sein de fibres optiques à coeur suspendu hautement non linéaires en verre de c…
2014
The work reported in this thesis deals with the fabrication of suspended core chalcogenide microstructured optical fibers (MOFs) for supercontinuum generation (SCG) beyond 6 μm. In this context, As2S3-based suspended-core MOFs were fabricated under vacuum, and loss threshold of 1-2 dB/m at 2.9µm were systematically registered. In addition, MOFs were designed with core diameter ranging from 1.5 to 3.5µm, allowing therefore to control the MOF's dispersive properties and to shift corresponding zero dispersion wavelength to 2.0-2.5 µm range. SCG experiments were performed by pumping the fabricated MOFs in their anomalous dispersion regime by means of tunable femtosecond laser source. Simultaneo…
Modulational instability and domain wall solitons in optical fibers
2000
The first part of this thesis presents some theoretical and experimental results about modulational instability and domain wall solitons in bimodal fibers.In the second part is devoted to the interaction of counter-propagating waves in an isotropic optical fiber
GekkoFS - A Temporary Distributed File System for HPC Applications
2018
We present GekkoFS, a temporary, highly-scalable burst buffer file system which has been specifically optimized for new access patterns of data-intensive High-Performance Computing (HPC) applications. The file system provides relaxed POSIX semantics, only offering features which are actually required by most (not all) applications. It is able to provide scalable I/O performance and reaches millions of metadata operations already for a small number of nodes, significantly outperforming the capabilities of general-purpose parallel file systems. The work has been funded by the German Research Foundation (DFG) through the ADA-FS project as part of the Priority Programme 1648. It is also support…
Direct lookup and hash-based metadata placement for local file systems
2013
New challenges to file systems' metadata performance are imposed by the continuously growing number of files existing in file systems. The total amount of metadata can become too big to be cached, potentially leading to multiple storage device accesses for a single metadata lookup operation. This paper takes a look at the limitations of traditional file system designs and discusses an alternative metadata handling approach, using hash-based concepts already established for metadata and data placement in distributed storage systems. Furthermore, a POSIX compliant prototype implementation based on these concepts is introduced and benchmarked. A variety of file system metadata and data operati…
Réussir en maths, plus dur pour une fille ?
1993
International audience; Les différences de réussite en mathématiques entre garçons et filles passent pour relativement évidentes. Mais une analyse précise de la nature, du calendrier et du "mode de production" de ces différences débouche sur des conclusions beaucoup plus nuancées, et intéressantes pour qui refuse cette apparente fatalité.
Estaciones del pánico. Primeras líneas de investigación
2021
In these pages I try to select within the semantics of fear that helps to organize the modern image of the political and legal order the specific element of panic, in the hypothesis that the latter constitutes a difference which is also an epistemic resource. Put a little shortly: if fear presents itself as a constitutive reference of the order, of its constitution as well as of its maintenance, panic seems instead charged with a contrary sign; it speaks to us of the dissolution of an aggregate given for presupposition and is in solidarity in defining its boundaries and conditions of possibility. The goal is to retrace some moments in the history of panic trying to argue that panic is a pol…