Compact wavelength monitoring by lateral outcoupling in wedged photonic crystal multimode waveguides

International audienceA device concept for laterally extracting selected wavelengths from an optical signal traveling along a waveguide, for operation in metropolitan area networks, is presented. The signal on the fundamental mode of a multimode photonic crystal waveguide is coupled to a higher-order mode, at a center frequency that spatially depends on the slowly varying guide parameters. The device is compact, intrinsically fault tolerant, and can split any desired fraction of the signal for monitoring purpose. Characterizations by the internal light source technique validate the optical concept whereas an integrated device with four photodiodes qualifies its potential with respect to real-world applications

Les mammifères du littoral mauritanien et liste de quelques observations ornithologiques. Compte-rendu de missions en Mauritanie (novembre-décembre 1994 et avril-mai 1995)

Le rapport de mission présente les travaux réalisés sur le terrain en Mauritanie en novembre-décembre 1994 et avril-mai 1995 complétés par des observations faites entre 1991 et 1995. Ces travaux ont permis de faire un prelier bilan des espèces de mammiferes présents le long du littoral mauritanien. Des données de méthodologie, de faunistique et d'écologie sont également introduites. En annexe 8 figure la liste complète de tous les individus récoltés. En annexe 9 figure la liste de quelques observations ornithologiques. (Résumé d'auteur

Le Parfait jeune homme, ou le Modèle des bons fils. Tome 2 / , par P. C.

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Le Triomphe des royalistes et de la cause sainte, ou la Chute du tyran, par P. Cuisin

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The winter diet of the marsh harrier in the marais of Brouage (France)

The diet of European marsh harrier was studied from 555 pellets collected in the Marais de Brouage (Charente-Maritime) during four winters distributed over a 17 years period (1985-86 / 2001-02). A total of 1074 prey items (70 taxa) were identified. The mammals are the most numerous (62.6%); three rodents represent half of the prey. The increase of coypu (Myocastor coypus) is the most important interannual variation, they currently represent more than the thrid of the pre

Les duels, suicides et amours du bois de Boulogne. Partie 2 / ... par un rôdeur caché dans un arbre creux de ce bois

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Les Fantômes nocturnes ; ou Les terreurs des coupables. Tome 1 / ; théâtre de forfaits offrant, par nouvelles historiques, des visions infernales de monstres fantastiques, d'images funestes, de lutins homicides, de spectres et d'échafauds sanglants, supplices précurseurs des scélérats

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New insights into use-wear development in bodily ornaments through the study of ethnographic collections

The use of microwear analysis has made substantial contributions to the study of archaeological bodily ornaments. However, limitations persist with regard to the interpretation of use and the reconstruction of systems of attachment, hampering a holistic understanding of the diversity of past bodily adornment. This is because the complexities of ornament biographies and the resulting wear traces cannot be grasped exclusively from the study of experimental reference collections. In this paper, we propose to bridge this gap in interpretation by systematically researching ethnographic collections. We conducted a microscopic study of 38 composite ornaments from lowland South America housed at the Musée du quai Branly (Paris). These objects involve organic, biomineral, and inorganic components, attached through different string configurations. The combined use of optical and 3D digital microscopy at different magnification ranges provided a thorough understanding of wear trace formation, distribution, and characterization. We demonstrate how individual beads develop characteristic use-wear in relation to one another and to the strings. We further challenge common assumptions made in the analysis of archaeological ornaments. In sum, this research addresses methodological and interpretative issues in the study of bodily adornment at large, by providing insight into the biographies of objects that were actually worn in a lived context. In the future, our results can be applied as reference for a more effective understanding of the use of ornaments worldwide.Archaeology of the AmericasMuseum StudiesMaterial Culture Studie