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Infoscience - École polytechnique fédérale de Lausanne
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35062 Publications
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  • Discrete- and continuous-time local cosine bases with multiple overlapping

    Bernardini, Riccardo; Vetterli, Martin (1998)
    Cosine-modulated filter banks (CMFB’s) are filter banks whose impulse responses are obtained by modulating a window with cosines. Among their applications are video and audio compression and multitone modulation. Their continuous- time counterpart is known as local cosine bases. Even though there is an extended literature on the discrete-time case both for single and multiple overlapping, the continuous-time case has received less attention, and only the single overlapping case has been solv...

    Intégration. Réfugiés dans quartier résidentiel

    Skarkova, Katerina (2015)
    Affluant en l'Europe, le nombre de réfugiés des pays affectés par des conflits politiques ne cesse d'augmenter. La question de l'intégration de ces migrants est au coeur des discussions politiques, et pourtant les réponses proposées ne sont toujours pas satisfaisantes. En effet, l'hébergement des réfugiés en périphérie, dans des baraques ou des casernes abandonnées – la solution habituellement prisée – n'aide pas à l'intégration et la rend, au contraire, d'autant plus difficile, voire impossi...

    Optimized configuration for high resolution distributed sensing using Brillouin echoes

    Jones, Julian D. C.; Foaleng-Mafang, Stella; Beugnot, Jean-Charles; Thévenaz, Luc (2009)
    A novel configuration has been developed to optimize the response of Brillouin echoes for distributed fibre sensing. Fully resolved measurements of the Brillouin frequency shift of a 5cm spot perturbation have been performed using a 500 ps (5cm) pulse width. The linewidth of the measured Brillouin gain spectrum remains comparable to the intrinsic linewidth for any pulse width. The high accuracy and inherent stability of the technique have been successfully verified.

    Generation of OH radicals at palladium oxide nanoparticle modified electrodes, and scavenging by fluorescent probes and antioxidants

    Liu, J.; Lagger, G.; Tacchini, P.; Girault, H. H. (2008)
    The reduction of palladium oxide nanoparticles in the presence of hydrogen peroxide or dissolved oxygen gives rise to a catalytic reduction current dependent on the hydrogen peroxide concentration or the oxygen concentration. Using terephthalic acid as an OH radical scavenger yielding the fluorescent 2-hydroxyterephthalic acid, we demonstrate that the catalytic current stems from the freshly exposed palladium metal re-oxidation by OH radicals. A kinetic model is presented to account for thes...
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