Search results for "PICO"
showing 10 items of 343 documents
Optical Cavity-Less 40-GHz Picosecond Pulse Generator in the Visible Wavelength Range
2019
International audience; High-repetition-rate optical frequency-comb sources emitting picosecond pulses play important roles in variousscientific researches and industrial applications. Such ultrafast pulse sources are mostly generated in opticalcavities or microresonators. By means of the wavelength-conversion techniques, it is possible to transfer thecavity-based near-IR robust and compact sources to the mid-IR or to the visible wavelength regions [1-2], forwhich there is an increasing demand, for biophotonics and other applications. Here we demonstrate the generationof high-repetition-rate picosecond pulses in the visible wavelength range by using a fully optical cavity-lessconfiguration.…
All-optical fiber-based devices for ultrafast amplitude jitter magnification
2012
International audience; We propose two fiber-based architectures that enable the all-optical magnification of ultrafast amplitude fluctuations of picosecond or femtosecond pulse trains. An increase of the fluctuations by more than one order of magnitude is experimentally achieved.
Supercontinuum generation by cascaded intermodal Raman and FWM processes in step-index few-mode fibers
2018
International audience; This work shows that step-index few-mode fibers can be combined with a simple microchip picosecond laser to give a multi-octave spanning supercontinuum output by cascaded Raman scattering and intermodal FWM.
Wavelength conversion and temporal compression of a pulse train using a dispersion oscillating fiber
2014
International audience; We demonstrate the generation of a picosecond pulse train taking advantage of the cross gain occurring in a dispersion oscillating fibre. The resulting frequency-converted signal is detuned by more than 20 nm from the pump and can be temporally compressed by a factor 2 compared to the input sinusoidal pump wave.
A “participação africana” num desporto olímpico: Lutas espaciais e questões de nacionalidade
2016
Cet article analyse les stratégies de reconnaissance d’une discipline olympique : le canoë de slalom. Il interroge en particulier les processus de diffusion de ce sport en Afrique en étudiant précisément sa place en tant que discipline au sein du mouvement olympique. Mais comment la diffusion d’un sport parmi les pays africains peut-elle cristalliser des enjeux nationaux ? Pour comprendre la complexité de cet objet, le remaniement des aires culturelles issues du joug des empires coloniaux est interrogé. Il s’agit d’inscrire les perceptions de la participation olympique dans les rivalités où elles s’inscrivent depuis les Indépendances. L’enquête restitue l’apport de la nationalité comme crit…
Acque di mezzo. Viaggio alla scoperta degli ambienti costieri della Sicilia: laghi, paludi, pantani, saline e stagni
2008
Oasi di Slander
2021
L’Oasi di Slander, naturalmente, non esiste. Ma è del tutto pensabile, immaginabile, e viene in- fatti descritta, in maniera agile intelligente e creativamente perfida. È un gioco, ma non un gioco innocente, anzi crudele per le allusioni e per i sentimenti che lascia trasparire. Soprattutto è anche un lavoro di mano competente e talora geniale. Racconta, con non sempre caritatevole humour, di una “derelict land” che il Signor Slander vuole far diventare un parco in- cantato e fruibile. Non senza introdurre sconcertanti regole urbanistiche, botaniche ed altro che condurranno a imprevedibili complicazioni. È una malizia letteraria. Ma, attenzione: sembra puro divertimento per i nostri lettori…
1992. La política valenciana en 1992. Broseta asesinado. Los grandes eventos de 1992
2014
Este documento recoge temas como la política valenciana en 1992, los Juegos Olímpicos de Barcelona, la Exposición Universal de Sevilla y Madrid capital europea de la cultura, junto a corrupción y crisis económica. También el asesinato de Manuel Broseta Pont en Valencia por la banda terrorista ETA, el 15 de enero de 1992; Felipe González abre el debate interno en el PSOE. Lerma ya no es guerrista. La ruptura Felipe-Guerra en el PSOE favorece el poder de Lerma. Lerma, barón en auge. Sobre el PP se incluyen los temas "El liderazgo de Aznar pierde fuelle". Pedro Agramunt, candidato perdedor. José Luis Manglano se postula al liderazgo del PPCV. El Tribunal Supremo anula las grabaciones el 'caso …
A Computational Based Approach for Non-invasive Localization of Atrial ectopic foci
2020
Las arritmias auriculares son las arritmias cardı́acas más comunes, afectan a seis millones de personas en Europa e imponen una enorme carga sanitaria en la sociedad. Las nuevas tecnologı́as médicas están ayudando a los electrofisiólogos a adaptar el tratamiento a cada paciente de diferentes maneras. Por ejemplo, la resonancia magnética (MRI) permite evaluar la distribución espacial de la fibrosis auricular; los mapas electroanatómicos (EAM) permiten obtener una caracterización eléctrica de los tejidos en tiempo real; Las imágenes electrocardiográficas (ECGI) permiten estudiar la actividad eléctrica cardı́aca de forma no invasiva; y la ablación por radiofrecuencia (RFA), permite eliminar el…
Dithiodiketopiperazine derivatives from endophytic fungi Trichoderma harzianum and Epicoccum nigrum
2021
A new epidithiodiketopiperazine (ETP), pretrichodermamide G (1), along with three known (epi)dithiodiketopiparazines (2-4) were isolated from cultures of Trichoderma harzianum and Epicoccum nigrum, endophytic fungi associated with medicinal plants Zingiber officinale and Salix sp., respectively. The structure of the new compound (1) was established on the basis of spectroscopic data, including 1D/2D NMR and HRESIMS. The isolated compounds were investigated for their antifungal, antibacterial and cytotoxic potential against a panel of microorganisms and cell lines. Pretrichodermamide A (2) displayed antimicrobial activity towards the plant pathogenic fungus Ustilago maydis and the human path…