Search results for "RILL"
showing 10 items of 1272 documents
Demonstration of polarization pulling in a fiber-optical parametric amplifier
2012
International audience; We report the experimental demonstration of all-optical polarization pulling of an initially polarization-scrambled signal using a fiber-optical parametric amplifier. Nonlinear polarization pulling has been achieved for both the signal and idler with 25 dB gain.
Ultra-high repetition all optical picosecond pulsed sources : applications in optical telecommunications
2013
This thesis presents the work carried out on the realization of fibered 40-GHz picosecond optical pulse sources in the telecommunications C-band. In the first part, we present a numerical and experimental study of the generation of 40-GHz pulse trains thanks to the nonlinear compression of an initial beat-signal by multiple Four-Wave Mixing process. Enhanced temporal stability is achieved by generating the sinusoidal beating thanks to a Mach-Zehnder modulator driven at its zero-transmission working point. In order to improve the quality of the generated pulses, we also demonstrate the suppression of stimulated Brillouin back-scattering by inserting several optical isolators into the compres…
Defect-controlled hypersound propagation in hybrid superlattices
2013
We employ spontaneous Brillouin light scattering spectroscopy and detailed theoretical calculations to reveal and identify elastic excitations inside the band gap of hypersonic hybrid superlattices. Surface and cavity modes, their strength and anticrossing are unambiguously documented and fully controlled by layer thickness, elasticity, and sequence design. This new soft matter based superlattice platform allows facile engineering of the density of states and opens new pathways to tunable phoxonic crystals.
Contact laws between nanoparticles: the elasticity of a nanopowder
2018
International audience; Studies of the mechanical contact between nanometer-scale particles provide fundamental insights into the mechanical properties of materials and the validity of contact laws at the nanoscale which are still under debate for contact surfaces approaching atomic dimensions. Using in situ Brillouin light scattering under high pressure, we show that effective medium theories successfully predict the macroscopic sound velocities in nanopowders if one takes into account the cementation of the contacts Our measurements suggest the relevance of the continuum approach and effective medium theories to describe the contact between nanoparticles of diameters as small as 4 nm, i.e…
Dissolved silica in the Garonne River waters : changes in the weathering dynamics
2000
The major ion chemistry of the Garonne River is indicative of seasonal variations in the weathering dynamics of the drainage basin. Using the geochemical model MEGA for calculation of the contribution of atmospheric CO2 to the total bicarbonate fluxes exported by the Garonne River allows estimations of the concentrations of the major dissolved elements that originate from silicate- and carbonate-rock weathering. The molecular ratio SiO2/Al2O3 was calculated for the 1989–1992 period to identify the main type of weathering in the Garonne River, and montmorillonite was shown to be the major mineral occurring in the weathering products. The seasonal variations of the SiO2/Al2O3 ratio also showe…
Modeling and energy optimization of the operative parts of an air assisted drill
2016
In the context of sustainable farming, the optimization of the energy costs of agricultural operations allows shorter working times and high quality of the agricultural operations. This question relates particularly to the seeding. This operation one is decisive for the quality of the future harvest. The modern high capacity seed drills must be compatible with all the constraints. The main goal of this PhD thesis is thus to develop an innovative methodology, integrating the modeling tools, in order to reduce the energy consumption of the heavy seeding equipment. Thus, we explored four key aspects concerning air seed drill design: maneuverability of poly-articulated seed drills; establishmen…
La morille et la truffe de Bourgogne (Tuber uncinatum : Dr Jekyll et Mr Hyde), deux champignons fascinants, mais complexes
2013
TRADUIRE LA POÉSIE DÉCADENTE – STUART MERRILL TRADUCTEUR D’ERNEST DOWSON
2020
Ce court article traite de la traduction de 3 poèmes d'Ernest Dowson par Stuart Merrill en 1905 dans Vers et Prose. Il analyse la métrique dowsonienne et la traduction de Merrill pour montrer non seulement la circulation de la Décadence britannique mais aussi l'hybridation des métriques.
Dans le labyrinthe de la maison Usher : fissures, fétiches et autres faux-semblants dans l’œuvre d’Alain Robbe-Grillet
2010
ISBN 978-2-256-91138-5; National audience; no abstract
Quelques réflexions sur la constitution du sujet social dans le Lazarillo et le Guzmán de Alfarache : poétique des valeurs et normes sociales
2011
Le présent travail tente d'offrir une lecture sociale des deux premiers romans dits " picaresques " - le Lazarillo de Tormes, publié en 1554, et le Guzmán de Alfarache de Mateo Alemán (1599-1604). Par 'social', il ne faut pas seulement entendre le fait que ces deux textes recourent abondamment à la satire des us et coutumes de l'Espagne du XVIe siècle en mettant en scène différents types sociaux, aussi bien plébéiens ou bourgeois qu'aristocrates. En réalité, l'écriture des deux œuvres semble avoir en commun une inclination marquée pour la réflexion sur des valeurs morales et sociales à partir du récit circonstancié et à la première personne des aventures du protagoniste. Néanmoins, le Guzmá…