Relevant bibliographies by topics / Conversions Stokes et anti-Stokes

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Academic literature on the topic 'Conversions Stokes et anti-Stokes'

Author: Grafiati
Published: 4 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Conversions Stokes et anti-Stokes"

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Kanemitsu, Yoshihiko. "(Invited) Fundamental Photophysics of Lead Halide Perovskites." ECS Meeting Abstracts MA2024-02, no. 51 (2024): 3553. https://doi.org/10.1149/ma2024-02513553mtgabs.

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Halide perovskites have been receiving significant attention as a new class of semiconductor optoelectronic materials for solar cells, displays, light-emitting diodes, and quantum light sources [1,2]. Their high-quality bulk crystal and nanocrystal samples can be fabricated by simple low-temperature solution processes, and they exhibit extremely high photoluminescence (PL) quantum yields even at room temperature. Optical spectroscopy is one of the most versatile techniques for characterizing new semiconductor materials. In this work, we discuss optical properties of ABX3 lead halide perovskite
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TAILLEUX, RÉMI. "On the energetics of stratified turbulent mixing, irreversible thermodynamics, Boussinesq models and the ocean heat engine controversy." Journal of Fluid Mechanics 638 (October 20, 2009): 339–82. http://dx.doi.org/10.1017/s002211200999111x.

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In this paper, the available potential energy (APE) framework of Winters et al. (J. Fluid Mech., vol. 289, 1995, p. 115) is extended to the fully compressible Navier–Stokes equations, with the aims of clarifying (i) the nature of the energy conversions taking place in turbulent thermally stratified fluids; and (ii) the role of surface buoyancy fluxes in the Munk & Wunsch (Deep-Sea Res., vol. 45, 1998, p. 1977) constraint on the mechanical energy sources of stirring required to maintain diapycnal mixing in the oceans. The new framework reveals that the observed turbulent rate of increase in
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Jones, Callum M. S., Adilet Zhakeyev, and Jose Marques-Hueso. "(Invited) Calibration of Upconverting Materials and Nanoprobes." ECS Meeting Abstracts MA2023-02, no. 63 (2023): 2990. http://dx.doi.org/10.1149/ma2023-02632990mtgabs.

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Upconversion has attracted much attention for the potential applications of nanomaterials and bulk materials. Upconversion nanoprobes and sensors rely on the non-linear emission of the reporters, which present a low efficiency due to their anti-Stokes nature. For these two reasons, the materials require accurate and contrastable efficiency measurements, typically by measuring the absolute upconversion quantum yield (UCQY). The methodology for such measurements will vary from traditional photoluminescence quantum yield techniques that have been applied for downshifting materials [1]. Effects li
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Polprasarn, Kasidapa, Pankaj Pareek, Dihya Sadi, Mario Janda, Oliver Guaitella, and David Pai. "In Situ Raman Spectroscopy of Plasma Electrochemical and Plasma Catalytic Reactors." ECS Meeting Abstracts MA2024-01, no. 24 (2024): 1408. http://dx.doi.org/10.1149/ma2024-01241408mtgabs.

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Plasma electrochemistry (PEC) has been under investigation for an expanding number of potential applications such as agriculture, water treatment, decarbonized chemical processing, and nanomaterials synthesis [1–4]. PEC in water leads to the formation of gas-phase species that undergo a cascade of processes in the liquid to produce aqueous species such as OH, H2O2, ONOOH, NO2 -, and NO3 - that are sought after in these applications. Plasma-assisted catalysis (PAC) is another growing research field for some of the same applications and others that occur in the gas phase, such as industrial cata
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Ivanov, Nikolay, Marina Zasimova, Evgueni Smirnov, and Detelin Markov. "Evaluation of mean velocity and mean speed for test ventilated room from RANS and LES CFD modeling." E3S Web of Conferences 85 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/20198502004.

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The paper presents and discusses data for the ventilation airflow in an isothermal room corresponding to the Nielsen et al. (1978) test computed with Large Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) approaches. As LES computations provide directly both the speed and velocity components data, the difference between the mean speed and mean velocity values is computed and discussed. For the RANS computations that give the mean velocity data only, application of the velocity-to-speed conversion procedure based on the turbulence kinetic energy field provided by a turbulence mo
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Scherman, Michael, Joanna Barros, Rosa Santagata, Alexandre Bresson, and Brigitte Attal-Tretout. "Thermométrie Raman cohérente pour l'étude de la combustion." Photoniques, no. 96 (May 2019): 23–29. http://dx.doi.org/10.1051/photon/20199623.

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La combustion est un sujet d’intérêt pour une large variété de domaines d’applications civils ou militaires. Comprendre les phénomènes physico-chimiques à l’oeuvre dans ces milieux complexes, et les décrire à l’aide de modèles éprouvés, sont des enjeux majeurs qui requièrent des mesures fiables et quantitatives. La spectroscopie par diffusion Raman anti-Stokes cohérente (DRASC ou CARS en anglais) a démontré des performances inégalées pour la mesure de température. Cette technique a été implémentée avec de nombreuses architectures laser, et appliquée avec succès à un large éventail de milieux.
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Huang, Huining, Haifeng Zhou, Juan Zhou, et al. "Correction: Enhanced anti-Stokes luminescence in LaNbO4:Ln3+ (Ln3+ = Yb3+, Er3+/Ho3+/Tm3+) with abundant color." RSC Advances 7, no. 31 (2017): 19305. http://dx.doi.org/10.1039/c7ra90049j.

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Correction for ‘Enhanced anti-stocks luminescence in LaNbO<sub>4</sub>:Ln<sup>3+</sup> (Ln<sup>3+</sup> = Yb<sup>3+</sup>, Er<sup>3+</sup>/Ho<sup>3+</sup>/Tm<sup>3+</sup>) with abundant color’ by Huining Huang et al., RSC Adv., 2017, 7, 16777–16786.
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Deckert, Volker, Tanja Deckert-Gaudig, Dana Cialla-May, et al. "Laser spectroscopic technique for direct identification of a single virus I: FASTER CARS." Proceedings of the National Academy of Sciences 117, no. 45 (2020): 27820–24. http://dx.doi.org/10.1073/pnas.2013169117.

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From the famous 1918 H1N1 influenza to the present COVID-19 pandemic, the need for improved viral detection techniques is all too apparent. The aim of the present paper is to show that identification of individual virus particles in clinical sample materials quickly and reliably is near at hand. First of all, our team has developed techniques for identification of virions based on a modular atomic force microscopy (AFM). Furthermore, femtosecond adaptive spectroscopic techniques with enhanced resolution via coherent anti-Stokes Raman scattering (FASTER CARS) using tip-enhanced techniques marke
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Wakolo, Solomon Wekesa, Hiromichi Nishiyama, Kenji Miyatake, and Junji Inukai. "Chemical States of Water in Anion Exchange Membrane for Fuel Cells Using Raman and Coherent Anti-Stokes Raman Spectroscopies." ECS Meeting Abstracts MA2023-02, no. 65 (2023): 3163. http://dx.doi.org/10.1149/ma2023-02653163mtgabs.

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Purpose Low membrane durability remains a major challenge in anion exchange membrane fuel cells (AEMFCs). This is despite the AEMFCs’ proven potential to eliminate the dependency of Fuel cells on Pt catalysts and bring about the mass commercialization of the technology. This problem can be effectively addressed through combined optimization of the AEMFCs’ operating conditions during evaluation, followed by finetuning of the membrane chemistry to address any observed weaknesses. After synthesis, water distribution is the primary operation condition determining a given AEM’s performance and life
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Chaussard, F., N. Le Cong, B. Lavorel, et al. "Spectroscopie Raman Anti-Stokes Cohérente femtoseconde (DRASC – fs) : expériences et modélisation dans le cas du mélange H2 – N2 à basse pression." Journal de Physique IV (Proceedings) 135, no. 1 (2006): 155–56. http://dx.doi.org/10.1051/jp4:2006135038.

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Dissertations / Theses on the topic "Conversions Stokes et anti-Stokes"

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Cheroura, Youcef. "Photoconversion et exaltation plasmonique de nanoparticules de β-NaGdF4 pour potentielles applications photovoltaïques sur silicium". Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2021. http://www.theses.fr/2021UCFAC023.

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Un système multifonctionnel a été élaboré pour être utilisé comme double capteur de lumière ultraviolette (UV) et proche infrarouge (NIR) et permettant de convertir ces rayonnements par des mécanismes Stokes (DS-DC) et anti-Stokes (UC) en lumière visible susceptible d’accroître le rendement des cellules photovoltaïques. Des nano-bâtonnets ( 140 nm x 60 nm) de β-NaGdF4 monodopés par Eu3+, Pr3+, Er3+ et codopés par Yb3+ ont été synthétisés de façon reproductible par co-précipitation (conditions optimisées : 150°C, 60 min). Les propriétés structurales et morphologiques ont été caractérisées par
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ZHANG, XIAO. "Excitation de la fluorescence anti-stokes de l'ion holmium trivalent dans les fluorites et le fluorure de lanthane." Reims, 1996. http://www.theses.fr/1996REIMS008.

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Ce travail presente une etude de la conversion rouge-vert et rouge-bleu par l'ion holmium trivalent dans les fluorites et le fluorure de lanthane. Une telle conversion peut s'effectuer par differents mecanismes: le processus d'absorptions successives, le transfert d'energie et l'avalanche de photons. Une connaissance approfondie de ces mecanismes est necessaire car ils sont utilises depuis une dizaine d'annees, pour realiser des lasers emettant dans le vert et bleu lorsqu'on les excite dans le rouge ou le proche infrarouge. Dans les cristaux de structure fluorite, l'ion holmium trivalent se su
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Goldner, Philippe. "Processus de paires dans une perovskite hexagonale : luminescence anti-stokes dans les systemes erbium-erbium et erbium-ytterbium." Paris 6, 1993. http://www.theses.fr/1993PA066376.

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L'etude spectroscopique de differents processus de conversion de frequence est presentee dans cscdbr#3. Dope ou codope par l'erbium et l'ytterbium. Les impuretes trivalentes forment dans cette matrice des paires compensees en charge de facon quasi-exclusive. Une etude par spectroscopie a haute resolution et a basse temperature, de structures de paires a mis en evidence, outre les dimeres symetriques (lacune centrale), un complexe asymetrique (lacune laterale). Dans ce cas, les ions sont couples par un fort transfert d'energie. Dans les echantillons codopes, des paires mixtes ont ete identifiee
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Gachet, David. "Microscopie CARS (Coherent anti-Stokes Raman scattering). Génération du signal au voisinage d'interfaces et à l'intérieur d'une cavité Fabry-Perot." Aix-Marseille 3, 2007. http://www.theses.fr/2007AIX30060.

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Le processus de diffusion "CARS" (Cohérent anti-Stokes Raman scattering) est une technique de spectroscopie qui donne accès à une information sur les modes vibrationnels intra-moléculaires de l'échantillon étudié. L'introduction de ce processus de diffusion en microscopie a été pour la première fois proposée en 1982. Elle a été par la suite mise en oeuvre dans une configuration colinéaire en 1999. La génération du signal en microscopie CARS a dès lors été étudiée sur des exemples simples. Dans ce mémoire de thèse, nous étendons l'analyse du signal en microscopie CARS en utilisant un formalisme
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Boulma, El-Haine. "Etude des propriétés spectroscopiques des ions erbium et thulium trivalents dilués dans des cristaux de KY3F10." Reims, 2007. http://www.theses.fr/2007REIMS025.

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La conversion de lumière vers les hautes fréquences s'effectue selon trois types de mécanismes d'excitation: absorptions successives de plusieurs photons, transfert d'énergie entre les ions dans un état excité et l'avalanche de photons. Ce dernier processus est un effet collectif basé sur un transfert d'énergie à partir d'un ion à l'état excité vers un ion à l'état fondamental. Sous certaines conditions, ces transferts peuvent conduire à une réaction en chaîne entraînant une importante augmentation de l'intensité de la fluorescence anti-Stokes. L'objet de ce travail est l'étude systématique de
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Joly, Véronique. "Etude théorique et expérimentale des mécanismes cinétiques dans le laser iode-oxygène chimique (LIOC)." Paris 11, 1989. http://www.theses.fr/1989PA112177.

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Le laser iode-oxygène chimique est un laser susceptible de fonctionner à des puissances très élevées. Il est le seul laser chimique à transition électronique. La longueur d'onde située dans le proche infrarouge à 1,315 µm est la plus basse des lasers chimiques de haute énergie connus à ce jour. Elle correspond à la transition dipolaire magnétique I²P₁/₂ - I²P₃/₂. La source d'énergie du laser est de l'oxygène excité métastable 0₂(1 Δg) obtenu par voie chimique. La première étape de la réaction correspond à la dissociation de l'iode moléculaire suivant un mécanisme non entièrement compris. Heidn
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Gachet, D. "Microscopie "CARS" (Coherent anti-Stokes Raman scattering). Génération du signal au voisinage d'interfaces et à l'intérieur d'une cavité Fabry-Perot." Phd thesis, 2007. http://tel.archives-ouvertes.fr/tel-00258999.

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Le processus de diffusion ``CARS'' (Coherent anti-Stokes Raman scattering) est une technique de spectroscopie qui donne accès à une information sur les modes vibrationnels intramoléculaires de l'échantillon étudié. L'introduction de ce processus de diffusion en microscopie a été pour la première fois proposée en 1982. Elle a été par la suite mise en œuvre dans une configuration colinéaire en 1999. La génération du signal en microscopie CARS a dès lors été étudiée sur des exemples simples. Dans ce mémoire de thèse, nous étendons l'analyse du signal en microscopie CARS en utilisant un formalisme
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Book chapters on the topic "Conversions Stokes et anti-Stokes"

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RIGNEAULT, Hervé, and Julien DUBOISSET. "Imagerie Raman cohérente." In Spectroscopies vibrationnelles. Editions des archives contemporaines, 2020. http://dx.doi.org/10.17184/eac.4204.

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Obtenir des informations sur la matière à des échelles micrométriques, de manière non destructive et sans utiliser aucun marquage reste un défi méthodologique et technologique. Les techniques établies de microscopie de fluorescence ont permis de réelles avancées dans la compréhension des phénomènes biologiques mais le marquage utilisant des fluorophores limite considérablement cette technique, en particulier dans le domaine biomédical. Depuis une quinzaine d’année, la microscopie Raman cohérente a connu un important essor. Basée sur les propriétés vibrationnelles des molécules, cette technique
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Conference papers on the topic "Conversions Stokes et anti-Stokes"

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Auyeung, R. C. Y., D. G. Cooper, and B. J. Feldman. "Stimulated anti-Stokes Raman scattering in inverted atomic selenium." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.tus5.

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The generation of 145.6-nm radiation by stimulated anti-Stokes Raman scattering in inverted atomic selenium was first reported by Ludewigt et al. 1 We have performed experimental studies of this process in similar excitation conditions, which allow us to compare some of the results in the two studies. The inverted population of the selenium (4p4)1S0 metastable state relative to the (4p4)3P0 state was prepared by photodissociation of COSe vapor using broadband 193-nm radiation from an ArF excimer laser. The pump beam at 205.1 nm was generated by the first-order Stokes shift in deuterium of narr
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Chee, J. K., and J. M. Liu. "Parametric Frequency Conversion in a Highly Birefringent Fiber." In Nonlinear Guided-Wave Phenomena. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/nlgwp.1989.thb12.

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A wide variety of nonlinear optical phenomena, such as stimulated Raman scattering[1], stimulated four-photon mixing[2], and sum-frequency generation[3], have been observed in optical fibers. For four-photon mixing in a fiber, phase matching condition has to be satisfied as well as conservation of energy. This has been successfully demonstrated both in multimode and single-mode fibers[4,5]. In a single-mode birefringent fiber, the birefringence in the fiber can compensate for the material dispersion[6,7]. Four-photon parametric process in single-mode birefringent fibers has been observed by St
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HAHN, J. W., S. N. PARK, K. T. KANG, and S. H. CHUNG. "Measuring CO Concentration and Temperature in a CH4/air Premixed Flame with Broadband Coherent Anti-Stokes Raman Spectroscopy." In Laser Applications to Chemical Analysis. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.wd.6.

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Coherent anti-Stokes Raman spectroscopy (CARS) has been widely used as a diagnostic tool for probing the temperature and species concentration of gas phase samples. CARS concentration measurements are typically performed either from the integration1,2 or from the shape of a CARS spectrum.3, 4 If the resonant signal of CARS is much bigger than the nonresonant background, integration of the CARS spectrum depends linearly on the squares of the concentration of the species. In practice, this method can be used to measure the concentration of major species. When the fraction of a species goes down
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Hancock, R. D., F. R. Schauer, R. P. Lucht, V. R. Katta, and K. Y. Hsu. "CARS Temperature Measurements in a Driven Jet Diffusion Flame." In Laser Applications to Chemical and Environmental Analysis. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/lacea.1996.lthd.3.

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This paper discusses the use of a broadband coherent anti-Stokes Raman scattering (CARS) system to investigate local gas temperatures during a vortex/flame interaction. The CARS system is first used to obtain flame temperature measurements in a series of near adiabatic hydrogen/air flames produced with a Hencken burner (Hencken, 1994; Hancock, et al., 1996). These temperatures are compared to adiabatic flame temperatures found using the NASA-Lewis equilibrium code (Gordon and McBride, 1976) and a computational fluid dynamics code developed by Katta, et al. (1994). These results help to validat
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Kerkvliet, Maarten, Guilherme Vaz, Nicolas Carette, and Michiel Gunsing. "Analysis of U-Type Anti-Roll Tank Using URANS: Sensitivity and Validation." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23483.

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The roll motion of ships operating in a seaway is often limiting operations. These limits could be due to, e.g. maximum acceleration, green water, capsize risk or just comfort. Therefore additional roll damping is desired to prevent uncontrolled roll motion. Different means are available to decrease the roll motion of a ship, amongst other these include bilge keels, active fin stabilizers (either for forward or zero speed) and U-shape or free surface anti-roll tanks (ART). The amplitude and phase of the roll opposing moment resulting from the water that moves inside the ART are a function of t
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