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Search Results: 1 - 10 of 462019 matches for " A. Cazé "
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Radiative and non-radiative local density of states on disordered plasmonic films
A. Cazé,R. Pierrat,R. Carminati
Physics , 2012, DOI: 10.1016/j.photonics.2012.03.001
Abstract: We present numerical calculations of the Local Density of Optical States (LDOS) in the near field of disordered plasmonic films. The calculations are based on an integral volume method, that takes into account polarization and retardation effects, and allows us to discriminate radiative and non-radiative contributions to the LDOS. At short distance, the LDOS is dominated by non-radiative channels, showing that changes in the spontaneous dynamics of dipole emitters are driven by non-radiative coupling to plasmon modes. Maps of radiative and non-radiative LDOS exhibit strong fluctuations, but with substantially different spatial distributions.
Spatial coherence in complex photonic and plasmonic systems
A. Cazé,R. Pierrat,R. Carminati
Physics , 2012, DOI: 10.1103/PhysRevLett.110.063903
Abstract: The concept of cross density of states characterizes the intrinsic spatial coherence of complex photonic or plasmonic systems, independently on the illumination conditions. Using this tool and the associated intrinsic coherence length, we demonstrate unambiguously the spatial squeezing of eigenmodes on disordered fractal metallic films, thus clarifying a basic issue in plasmonics.
Evaluación de la supervivencia de Trichocereus terscheckii en suelos contaminados con residuos y productos peligrosos de estaciones de servicio
Plaza,J; de Viana,M L; Cazón,A V;
Ecolog?-a austral , 2003,
Abstract: the contamination of soil by hydrocarbons from waste of petrol pump is an important subject to board. the objective of this work was to study the effect of different concentrations of gas oil, naphtha and burned oil, and of mud and landfarming upon trichocereus terscheckii survival. the bioassay was carried out in laboratory following a complete randomized design with four replicates for treatment, with constant temperature and light. there were nine plantules (three months years old) for treatment. survival of plantules was lower at both gas oil and naphtha concentrations examined, and higher in burned oil and landfarming.
Intensity correlations between reflected and transmitted speckle patterns
N. Fayard,A. Cazé,R. Pierrat,R. Carminati
Physics , 2015, DOI: 10.1103/PhysRevA.92.033827
Abstract: We study theoretically the spatial correlations between the intensities measured at the input and output planes of a disordered scattering medium. We show that at large optical thicknesses, a long-range spatial correlation persists and takes negative values. For small optical thicknesses, short-range and long-range correlations coexist, with relative weights that depend on the optical thickness. These results may have direct implications for the control of wave transmission through complex media by wavefront shaping, thus finding applications in sensing, imaging and information transfer.
Mapping and Quantifying Electric and Magnetic Dipole Luminescence at the nanoscale
L. Aigouy,A. Cazé,P. Gredin,M. Mortier,R. Carminati
Physics , 2014, DOI: 10.1103/PhysRevLett.113.076101
Abstract: We report on an experimental technique to quantify the relative importance of electric and magnetic dipole luminescence from a single nanosource in structured environments. By attaching a $Eu^{3+}$-doped nanocrystal to a near-field scanning optical microscope tip, we map the branching ratios associated to two electric dipole and one magnetic dipole transitions in three dimensions on a gold stripe. The relative weight of the electric and magnetic radiative local density of states can be recovered quantitatively, based on a multilevel model. This paves the way towards the full electric and magnetic characterization of nanostructures for the control of luminescence at the single emitter level.
TLE (Théorie, Littérature, Enseignement) n° 24 (2006-2007)
Antoine Cazé
Transatlantica : Revue d'études Américaines , 2008,
Abstract: Après deux excellents numéros, l’un consacré au diagramme (TLE 22, 2004) et l’autre au motif (TLE 23, 2005), ce volume de la revue dirigée par No lle Batt est le dernier d’un triptyque critique faisant le point sur l’héritage de concepts deleuziens en linguistique, philosophie du langage, sémiotique, épistémologie et études littéraires. Fidèle au triple objectif de son titre, TLE offre ici un panorama particulièrement convaincant de la notion de force, telle qu’elle informe la traditi...
Chroni(qu)es new-yorkaises : City Life de Steve Reich
Antoine CAZé
E-rea : Revue électronique d’études sur le Monde Anglophone , 2010, DOI: 10.4000/erea.1226
Abstract: Cet article analyse une uvre de Steve Reich intitulée City Life (1995), dans laquelle le compositeur américain mêle des bruits et voix enregistrés par ses soins dans les rues de New York à un ensemble instrumental classique. Nous tentons de montrer qu'en dépit des apparences, Reich ne propose en rien une illustration sonore de la ville ni ne crée un quelconque imaginaire urbain, mais articule une pensée et une pratique proprement politiques de la cité, poursuivant ainsi son travail entamé depuis les années 1960 avec It’s Gonna Rain. Fidèle à sa technique musicale fondée sur la répétition et le décalage de phases, Reich construit City Life comme une transposition des temporalités multiples et asynchrones de la ville : la chronique qu’il tient des bruits de New York devient ainsi une véritable chronie, qui lui permet d’une part de redonner voix à une communauté et de l’autre de repenser le lien entre le concert comme rituel social et l’espace urbain où il s’inscrit. This article analyzes Steve Reich’s City Life, a 1995 piece in which the American composer blends noises and voices he recorded on the streets in New York City with the sounds of an instrumental ensemble. We try to demonstrate that in spite of appearances, Reich does not merely propose a soundscape of the city or attempt to fit any preconceived sound rendition of a city; rather, we argue that through this work, he develops a properly political practice and theory of the city allowing him to go further in the direction he first explored back in the 1960s with It’s Gonna Rain. Along the lines of his customary composition techniques involving repetition and phasing, Reich has build City Life as a transposition of the multiple and asynchronous temporalities characterizing a city: his chronicle of New York sounds thus becomes a real chronotope allowing him to give back its voice to the urban community while offering a fresh perspective upon the classical music concert as it relates with the city space in which it takes place.
“The end of friendship with self alone”: Autobiographical Erasures in John Ashbery’s “Fragment”
Antoine CAZé
E-rea : Revue électronique d’études sur le Monde Anglophone , 2007, DOI: 10.4000/erea.176
Abstract: ArgumentThe poetry of John Ashbery is deceptively autobiographical. This apparently simple statement draws the critic’s attention to the much commented upon disjunctions characteristic of Ashbery’s poetic matter and manner, premising them upon an essential rift that splits open the integrity of the subject; such an evaluation of his poetry has consequently been reiterated in various guises by several critics. Chief among these is John Shoptaw, whose book-length study of the poet relies throug...
Discriminación de heces de puma (Puma concolor) y jaguar (Panthera onca) por identificación de sus ácidos biliares: una técnica para el monitoreo de carnívoros silvestres
Cazón,Ada V.; Juarez,Victor D.; Monjeau,J. A.; Lilienfeld,M.;
Mastozoolog?-a neotropical , 2009,
Abstract: in faunal surveys, it is frequent to use feces as a source of information of many studies. this methodology is very useful for large carnivores that are difficult to see. however, the specific identification is not always correct, especially when two species have the same distribution. this is the case of puma and jaguar at intermediate altitudes in amboró national park in bolivia, our case study. to solve this problem we used a simple laboratory technique, thin layer chromatography that allows the identification of species by chromatographic determination of intensity, colour and presence/absence pattern of fecal bile acids. we compared the bile acid pattern of samples collected in amboró national park with that one of known samples from zoos and fauna stations. the results show that the cougar bile acid pattern was: lithocholic, dehydrocholic, deoxycholic, quenodeoxycholic, cholic glycocholic and four non identified bile acids. the jaguar bile acid pattern was: lithocholic, dehydrocholic, deoxycholic, cholic, glycocholic and three non identified bile acids. we found cholesterol in all samples. the use of this technique is very important because it is cheap and simple for fauna monitoring.
DISCRIMINACIóN DE HECES DE PUMA (Puma concolor) Y JAGUAR (Panthera onca) POR IDENTIFICACIóN DE SUS áCIDOS BILIARES: UNA TéCNICA PARA EL MONITOREO DE CARNíVOROS SILVESTRES
Ada V. Cazón,Victor D. Juarez,J. A. Monjeau,M. Lilienfeld
Mastozoolog?-a neotropical , 2009,
Abstract: Es frecuente el uso de las heces como fuente de información en los estudios de registro de fauna. Aquellas son de gran utilidad para los grandes carnívoros, ya que éstos son muy difíciles de ver. Sin embargo, la identificación específica no es siempre correcta, especialmente en especies simpátricas. Ese es el caso del puma y del jaguar en altitudes intermedias del Parque Nacional Amboró en Bolivia, nuestro caso de estudio. Para resolver este problema hemos utilizado una simple técnica de laboratorio, la cromatografía de capa fina (TLC por sus siglas en inglés). La TLC permite la identificación específica por determinación cromatográfica de ácidos biliares. La intensidad, el color y la presencia o ausencia de ácidos biliares en las heces varía entre especies. En este trabajo hemos comparado los patrones de ácidos biliares de muestras obtenidas en el parque nacional Amboró con muestras testigo obtenidas de zoológicos y estaciones faunísticas. El resultado muestra que el patrón de ácidos biliares del puma está compuesto por los ácidos litocólico, dehydrocólico, deoxicólico, quenodeoxicólico, cólico-glicocólico y cuatro ácidos no identificados. El patrón de ácidos biliares del jaguar está compuesto por los ácidos litocólico, dehydrocólico, deoxicólico, cólico, glicocólico y tres ácidos no identificados. Encontramos colesterol en todas las muestras. Se destaca la utilidad de esta técnica para monitoreos de fauna por ser barata y simple.
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