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Auswahl der wissenschaftlichen Literatur zum Thema „Couplage hybride“
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Zeitschriftenartikel zum Thema "Couplage hybride"
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Bousquet, Bruno, Lionel Canioni, Jean-Paul Guillet, Stéphanie Fleck, Erwan Normand und Martin Hachet. „HOBIT. Un concept innovant pour la transformation des pratiques pédagogiques en physique“. Reflets de la physique, Nr. 73 (Juli 2022): 36–39. http://dx.doi.org/10.1051/refdp/202273036.
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La transformation des pratiques pédagogiques est devenue une nécessité pour faciliter l’accès au savoir d’étudiants qui ont du mal à comprendre les concepts abstraits ainsi que les modèles physiques et les outils mathématiques sous-jacents. Dans ce contexte, nous avons conçu, développé et évalué le dispositif HOBIT, destiné à soutenir l’apprentissage des connaissances fondamentales et des compétences techniques dans le domaine de l’optique, grâce au couplage d’une simulation numérique et d’une manipulation d’objets physiques dans un environnement hybride de réalité augmentée tangible. Nous présentons ici notre démarche de conception et la manière dont HOBIT, dont le concept pourrait être étendu à d’autres disciplines de la physique, a d’ores et déjà modifié nos pratiques pédagogiques.
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Ballouk, Houssein, Slim Belaid und Sami Ben Jabeur. „Plateformes digitales et innovation : analyse bibliométrique et pistes de recherche futures“. Innovations Pub. anticipées (11.06.2023): I158—XXXII. http://dx.doi.org/10.3917/inno.pr2.0158.
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Cette étude fournit un aperçu complet de la relation entre les plateformes digitales et l’innovation, en utilisant une revue intégrée hybride et en combinant l’analyse bibliométrique avec une revue basée sur un cadre du 4 W (quoi, où, pourquoi et quand). Nous nous appuyons sur la structure thématique de la recherche sur les plateformes digitales et l’innovation pour la période 2000-2023 en effectuant un couplage bibliométrique, une cooccurrence de mots-clés et une analyse de contenus thématiques, de réseaux sociaux et du groupement d’articles scientifiques. Les résultats indiquent que les recherches futures vont se concentrer sur 4 thématiques : (a) l’écosystème des plateformes digitales, (b) l’entrepreneuriat numérique, (c) le développement des business models et (d) les plateformes digitales et l’éthique. Cet article fournit aux chercheurs, aux entreprises et aux décideurs politiques des informations sur la relation entre les plateformes digitales et l’innovation. Codes JEL : L86, O31, O33, L26
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Hinteregger, Clemens, Johanna Dolensky, Werner Seebacher, Robert Saf, Pascal Mäser, Marcel Kaiser und Robert Weis. „Synthesis and Antiprotozoal Activity of Azabicyclo-Nonane Pyrimidine Hybrids“. Molecules 28, Nr. 1 (30.12.2022): 307. http://dx.doi.org/10.3390/molecules28010307.
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2,4-Diaminopyrimidines and (dialkylamino)azabicyclo-nonanes possess activity against protozoan parasites. A series of fused hybrids were synthesized and tested in vitro against pathogens of malaria tropica and sleeping sickness. The activities and selectivities of compounds strongly depended on the substitution pattern of both ring systems as well as on the position of the nitrogen atom in the bicycles. The most promising hybrids of 3-azabicyclo-nonane with 2-aminopyrimidine showed activity against P. falciparum NF54 in submicromolar concentration and high selectivity. A hybrid with pyrrolidino substitution of the 2-azabicyclo-nonane as well as of the pyrimidine moiety exhibited promising activity against the multiresistant K1 strain of P. falciparum. A couple of hybrids of 2-azabicyclo-nonanes with 2-(dialkylamino)pyrimidines possessed high activity against Trypanosoma brucei rhodesiense STIB900 and good selectivity.
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Duan, Luming. „A strong hybrid couple“. Nature 508, Nr. 7495 (09.04.2014): 195–96. http://dx.doi.org/10.1038/508195a.
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B. Dhage, Janhavi, Shyam B. Dhage und Bapurao C. Dhage. „AN ALGORITHMIC APPROACH TO LOCAL SOLUTION OF THE NONLINEAR SECOND ORDER ORDINARY HYBRID INTEGRODIFFERENTIAL EQUATIONS“. jnanabha 53, Nr. 01 (2023): 277–86. http://dx.doi.org/10.58250/jnanabha.2023.53133.
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In this paper, we establish a couple of approximation results for local existence and uniqueness of the solution of an IVP of nonlinear second order ordinary hybrid integrodifferential equations by using the Dhage monotone iteration method based on the recent hybrid fixed point theorems of Dhage (2022) and Dhage et al. (2022). An approximation result for Ulam-Hyers stability of the local solution of the considered hybrid differential equation is also established. Finally, our main abstract results are also illustrated with a couple of numerical examples.
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Dhage, Janhavi, und Bapurao Dhage. „Approximating local solution of IVPs of nonlinear first order ordinary hybrid integrodifferential equations“. Malaya Journal of Matematik 11, Nr. 04 (01.10.2023): 344–55. http://dx.doi.org/10.26637/mjm1104/002.
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In this paper, we prove a couple of approximation results for local existence and uniqueness of the solution of a IVP of nonlinear first order ordinary hybrid integrodifferential equations by using the Dhage monotone iteration method based on a hybrid fixed point theorem of Dhage (2022) and Dhage {et al.} (2022). An approximation result for the Ulam-Hyers stability of the local solution of the considered hybrid differential equation is also established. Finally, our main abstract results are also illustrated with a couple of numerical examples.
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Luo, Jian Guo, und Mao Yan He. „Cubic Hybrid Mechanism Based on S[T] Output Base and P/R Input Base“. Advanced Materials Research 430-432 (Januar 2012): 1725–28. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1725.
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Based on the flexibility of single couple of serial mechanism and the stability of multi couples of parallel mechanism, a new type of S[T] output base of hybrid mechanism presented, component of sphere joint run through the tiger joint, this component still the output one with the capability of rotate in three dimensional space. Add serial branch including three translation couple P or/and rotation couple R to the new type of S[T] output base, put these members on one cubic frame, twenty seven configurations obtained with 3-DOF(degree of freedom) allow of three dimensional rotation, twenty seven configurations belong to three conditions obtained with 4-DOF allow of three dimensional rotation and one dimensional translation, nine configurations belong to three conditions obtained with 5-DOF allow of three dimensional rotation and two dimensional translation, one configuration obtained with 6-DOF allow of three dimensional rotation and three dimensional translation, all those sixty four configurations have no more than six translation couple or rotation couple, and the sum of two kind of couple is equal to six. Developing new type of hybrid manipulator based on the hybrid cubic mechanism constructed with S[T] output base and P/R input base will be possible in theory and useful.
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Dhage, Bapurao, Janhavi Dhage und Shyam Dhage. „Approximation results for local solution of the initial value problems of nonlinear first order ordinary hybrid integrodifferential equations“. Malaya Journal of Matematik 13, Nr. 01 (01.01.2025): 75–87. https://doi.org/10.26637/mjm1301/009.
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In this paper, we establish a couple of approximation results for local existence and uniqueness of the solution of a initial value problem of nonlinear first order ordinary hybrid integrodifferential equations by using the Dhage monotone iteration method based on the recent hybrid fixed point theorems of Dhage (2022) and Dhage {\em et al.} (2022). An approximation result for Ulam-Hyers stability of the local solution of the considered hybrid differential equation is also established. Finally, our main abstract results are also illustrated with the help of a couple of numerical examples.
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Zhou, Weibing, Lilong Sun, Kang Li und Shouqin Tian. „Enhanced Photocatalytic Activity of V2C MXene-Coupled ZnO Porous Nanosheets with Increased Surface Area and Effective Charge Transfer“. Materials 17, Nr. 11 (24.05.2024): 2529. http://dx.doi.org/10.3390/ma17112529.
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Photocatalysis performs excellently when degrading organic pollutants, but the photocatalytic degradation rate is not high for most photocatalysts due to their narrow sunlight adsorption range and high recombination rate of electron hole pairs. Herein, we use V2C-MXene with a wide sunlight adsorption range to couple ZnO porous nanosheets and form ZnO/MXene hybrids using a facile electrostatic self-assembly method. The ZnO/MXene hybrids acquired demonstrated improved photochemical efficiency in breaking down methylene blue (MB) when contrasted with porous ZnO nanosheets. The degradation rate of MB reached 99.8% under UV irradiation for 120 min after the ZnO/MXene hybrid formation, while 38.6% was attained by the ZnO porous nanosheets. Moreover, photodegradation rate constants (k) were calculated as 3.05 × 10−3 and 5.42 × 10−2 min−1 for ZnO porous nanosheets and ZnO/MXene hybrids, respectively, indicating that the photodegradation performance was enhanced by 17.8 times after the modification of V2C. This was probably because the modification of V2C can increase the specific surface area to provide more sites for MB adsorption, widen the sunlight adsorption range to produce good photothermal effect, and facilitate the transfer of photogenerated carriers in ZnO to promote the reaction of more photogenerated carriers with MB. Hence, this work offers a simple approach to creating effective photocatalysts for breaking down organic contaminants.
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Khatri, Chandra B., und Satish C. Sharma. „Influence of couple stress lubricant on the performance of textured two-lobe slot-entry hybrid journal bearing system“. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, Nr. 3 (05.08.2016): 366–84. http://dx.doi.org/10.1177/1350650116658377.
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This paper concerns with theoretical investigation to predict the combined influence of textured surface and couple stress lubricant behavior on the performance of circular/two-lobe slot-entry hybrid journal bearing. The flow of incompressible couple stress lubricant through the clearance of a textured journal bearing system is governed by the modified Reynolds equation. The modified Reynolds equation has been derived on the basis of Stokes micro-continuum theory and is solved using a finite element method technique for computing the bearing performance characteristics parameters. The static and dynamic characteristics of circular/two-lobe slot-entry hybrid journal bearing have been computed for textured and non-textured bearings with influence of couple stress lubricant. The present study indicates that the influence of couple stress lubricant behavior is significantly more on the values of fluid film stiffness coefficients [Formula: see text], critical mass of journal [Formula: see text], and stability threshold speed margin [Formula: see text] for textured surface than that of non-textured surface in case of a slot-entry hybrid journal bearing system.
Dissertationen zum Thema "Couplage hybride"
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Etancelin, Jean-Matthieu. „Couplage de modèles, algorithmes multi-échelles et calcul hybride“. Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM072/document.
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Dans cette thèse nous explorons les possibilités offertes par l'implémentation de méthodes hybrides sur des machines de calcul hétérogènes dans le but de réaliser des simulations numériques de problèmes multiéchelles. La méthode hybride consiste à coupler des méthodes de diverses natures pour résoudre les différents aspects physiques et numériques des problèmes considérés. Elle repose sur une méthode particulaire avec remaillage qui combine les avantages des méthodes Lagrangiennes et Eulériennes. Les particules sont déplacées selon le champ de vitesse puis remaillées à chaque itération sur une grille en utilisant des formules de remaillage d'ordre élevés. Cette méthode semi-Lagrangienne bénéficie des avantages du maillage régulier mais n'est pas contrainte par une condition de CFL.Nous construisons une classe de méthodes d'ordre élevé pour lesquelles les preuves de convergence sont obtenues sous la seule contrainte de stabilité telle que les trajectoires des particules ne se croisent pas.Dans un contexte de calcul à haute performances, le développement du code de calcul a été axé sur la portabilité afin de supporter l'évolution rapide des architectures et leur nature hétérogène. Une étude des performances numériques de l'implémentation GPU de la méthode pour la résolution d'équations de transport est réalisée puis étendue au cas multi-GPU. La méthode hybride est appliquée à la simulation du transport d'un scalaire passif dans un écoulement turbulent 3D. Les deux sous-problèmes que sont l'écoulement turbulent et le transport du scalaire sont résolus simultanément sur des architectures multi-CPU et multi-GPUIn this work, we investigate the implementation of hybrid methods on heterogeneous computers in order to achieve numerical simulations of multi-scale problems. The hybrid numerical method consists of coupling methods of different natures to solve the physical and numerical characteristics of the problem. It is based on a remeshed particle method that combines the advantages of Lagrangian and Eulerian methods. Particles are pushed by local velocities and remeshed at every time-step on a grid using high order interpolation formulas. This forward semi-lagrangian method takes advantage of the regular mesh on which particles are reinitialized but is not limited by CFL conditions.We derive a class of high order methods for which we are able to prove convergence results under the sole stability constraint that particle trajectories do not intersect.In the context of high performance computing, a strong portability constraint is applied to the code development in order to handle the rapid evolution of architectures and their heterogeneous nature. An analysis of the numerical efficiency of the GPU implementation of the method is performed and extended to multi-GPU platforms. The hybrid method is applied to the simulation of the transport of a passive scalar in a 3D turbulent flow. The two sub-problems of the flow and the scalar calculations are solved simultaneously on multi-CPU and multi-GPU architectures
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Abid, Ines. „Plasmonique hybride : propriétés optiques de nanostructures Au-TMD, couplage plasmon-exciton“. Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30333/document.
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Récemment, la famille des dichalcogénures de métaux de transition (TMDs) (MoS2, WS2, MoSe2...) a suscité l'intérêt de nombreuses équipes de recherche en raison de leurs propriétés optiques, électroniques et spintroniques exceptionnelles. Ma thèse est centrée sur l'association de monocouches de TMDs à des nano-structures plasmoniques. Ces dernières apportent une exaltation des propriétés d'absorption, de diffusion et d'émission optiques qui peuvent être mises à profit dans divers domaines d'applications tels que l'opto-électronique, la photo-catalyse ou les capteurs. Dans une première partie je me suis intéressée à l'interaction plasmon-exciton dans des systèmes hybrides constitués de couches de MoSe2 élaborés par dépôt chimique en phase vapeur (CVD) et transférées sur les nanodisques d'or. La résonance plasmon est contrôlée par le diamètre et la séparation entre les nano-disques. Grâce à des mesures de transmission optique et de photoluminescence, et à une analyse détaillée des réponses spectrales basée sur un modèle analytique et des simulations numériques, j'ai mis en évidence un couplage de type Fano entre les plasmons de surface des nanodisques et les transitions excitoniques de MoSe2. J'ai étudié la dépendance de ce couplage en fonction de la taille des disques, du nombre de monocouches de MoSe2 déposées et aussi en fonction de la température. Une analyse quantitative des résultats a été menée en simulant numériquement non seulement le champ local plasmonique mais aussi son couplage avec le moment dipolaire des transitions excitoniques. Pour compléter l'exploration des propriétés optiques du système MoSe2@Au, je me suis intéressée à la diffusion Raman dans des conditions d'excitation résonante et non-résonante de la transition hybride plasmon-exciton. L'idée principale étant que la résonance plasmonique apporte une exaltation de la diffusion Raman par effet SERS (Surface Enhanced Raman Scattering) tandis que les transitions excitoniques contribuent par l'effet Raman résonnant. Cette combinaison des résonances plasmonique et excitonique conduit à un effet SERS résonant. J'ai ainsi pu distinguer les contributions relatives de ces deux résonances, notamment grâce à l'imagerie confocale de la diffusion Raman. J'ai également montré que, dans ces conditions d'excitation résonnante de la transition plasmon-exciton, un phénomène d'hyperthermie a lieu. la modélisation par simulation numérique du champ proche optique et de la diffusion Raman a été utile pour comprendre les principaux facteurs limitatifs de l'exaltation Raman. Ensuite, la couche de MoSe2 a été utilisée comme substrat de nanoparticules d'Au. Les mesures de photoluminescence ont révélé une extinction quasi-totale de l'émission de la photoluminescence. Afin d'expliquer ce phénomène, deux possibilités ont été discutés : (i) le passage de la structure de bande électronique de la couche de TMD d'un semiconducteur à gap direct à indirect à cause de la contrainte imposée par les nanoparticules d'Au (ii) le désordre structural dû au dépôt des nanoparticules d'Au (iii) le transfert des porteurs photo- générés du semiconducteur vers le métal. Grâce aux mesures Raman, et à l'émission radiative des nanoparticules d'Au, j'ai mis en évidence un phénomène de transfert de charges entre le semi conducteur et le métal. Pour compléter les interprétations proposées, j'ai mené une étude comparative avec les propriétés optiques de couche de TMD couvertes \nolinebreak de silice. Ce travail de thèse a été mené au sein du groupe NeO du CEMES et dans le cadre d'une collaboration avec le groupe du Professeur Jun Lou de l'université de Rice à HoustonTransition metal dichalcogenide materials (TMDs) are increasingly gaining attention, due to their unique optical, spintronic, and electronic properties. These properties result from the ultimate confinement in 2D monolayers of a direct band-gap semiconductor and the lack of inversion symmetry in the crystallographic structure. To control and enhance the optical response of these materials, it is interesting to integrate them with plasmonic nano-resonators. The TMDs/plasmonic hybrid systems have been extensively studied for plasmon-enhanced optical signals, photocatalysis, photodetectors, and solar cells. In this context, this thesis deals with the interaction between TMD monolayers and gold nanostructures. In a first part, an hybrid system composed of CVD grown MoSe2 monolayers transferred on gold nanodisks was studied. Surface plasmon resonance was tuned by controlling the nanodisks size and the inter-disks separation. The optical properties of the nanostructures are probed by means of spatially resolved optical transmission and photoluminescence spectroscopies. Fano-type coupling regime between the surface plasmon of the gold nanodisks and the MoSe2 exciton was evidenced by a quantitative analysis of the optical extinction spectra based on an analytical model. Our interpretations were supported by numerical simulations. The number of MoSe2 monolayer dependence as well as the Temperature dependence of the plasmon-exciton interaction was investigated. Our results were quantatively analysed on the nanometric scale by studying the local electromagnetic near-field and the excitonic transition dipole momentum interaction. Furthermore, the Raman scattering of MoSe2@Au system was carried out. A particular situation was investigated where a resonant interaction between the surface plasmon of nanodisks and A exciton of v occur. The contribution of these two resonances leads to a resonant surface enhanced Raman scattering (SERRS) effect. The Raman Scattering excitation is selected to resonantly excite the Surface Plasmon resonance and MoSe2 excitonic transition simultaneously. The relative contribution of the surface Plasmon and the confined exciton to the resonant Raman scattering signal is pointed out. In this resonant condition, a hyperthermia effect was detected. Numerical simulations of the SERS gain were useful to figure out the main factors affecting the SERS intensity enhancement in MoSe2@Au. In a second part, the TMD monolayer was used as a substrate of Au nanoparticles. Au nanoislands were deposited on mono- and few-layered MoSe2 flakes. Photoluminescence (PL) measurements revealed a net quenching of the MoSe2 photoluminescence. To figure out the origin of this quenching three possibilities were discussed (i) the charge transfer between the TMD monolayer and the Au particles (ii) the direct to indirect gap transition of the TMD electronic band structure caused by the strain induced by the metal deposition (iii) structural disorder imparted by the nanoparticles in the TMD/metal interface. Owing to the Raman scattering measurements and using the radiative emission of the gold nanoparticles, we evidenced a charge transfetrt between the metallic nanostructures and the semiconductor. In order to complement our interpretations a comparative study with respect to optical properties of TMD covered by a silica film was carried out. The present work was held within the NeO group in CEMES, in a frame of a collaboration with the group of thr Pr. Jun Lou from Rice university, Houston
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Khoi, Nguyen Trong. „Couplage d'ondes pour le chauffage des plasmas à la fréquence hybride basse“. Grenoble INPG, 1986. http://www.theses.fr/1986INPG0016.
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La theorie lineaire et quasi-lineaire de la propagation des ondes au voisinage de la frequence hybride inferieure et de leur interaction avec les particules du plasma est utilisee pour determiner les parametres et le dimensionnement des coupleurs d'ondes lentes dans les trois applications principales : chauffage des ions, chauffage des electrons et generation de courant. Le tenseur dielectrique "plasma froid" est utilise pour determiner l'admittance de surface plasma qui represente la charge de l'antenne et conditionne son efficacite
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Nguyen, Trong-Khoi. „Couplage d'ondes pour le chauffage des plasmas à la fréquence hybride basse“. Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600043n.
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Cadet, Laurent. „Etude du couplage convection-rayonnement en cavité différentiellement chauffée à haut nombre de Rayleigh en ambiances habitables“. Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS022/document.
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L'influence des transferts radiatifs sur les écoulements de convection naturelle en cavités habitables est étudié numériquement en régimes turbulents. L'étude considère des approches DNS et LES pour le problème de convection et une méthode des ordonnées discrètes (MOD) pour la résolution du problème radiatif combinée au modèle de gaz réel SLW. La configuration étudiée est basée sur une cavité différentiellement chauffée expérimentale en air située à l'institut PPRIME, de rapport d'aspect vertical 4, pour des nombres de Rayleigh allant de 1,5x109 à 1,2x1011. La première partie de l'étude se focalise sur les techniques de parallélisations hybrides MPI + OpenMP de la MOD. Les méthodes développées montrent une amélioration des performances de 13 à 1600% pour des niveaux d'hybridations élevés par rapport à la méthode classique de front d'onde. Puis, une étude du couplage convection-rayonnement surfacique est réalisée au travers d'une étude de sensibilité de l'écoulement vis-à-vis des émissivités de parois pour différentes valeurs du nombre de Rayleigh. Ensuite, le rayonnement volumique du gaz est ajouté, et son impact est évalué au travers d'une variation du taux d'humidité relative du mélange air sec/vapeur d'eau. Les résultats obtenus sont comparés aux cas d'une cavité convectivement adiabatique (i.e. flux convectif nul aux parois passives). Les transferts radiatifs ont pour effet de diminuer la stratification thermique centrale et d’augmenter la dynamique générale de l'écoulement. L'émissivité des parois passives pilote principalement la localisation de la transition laminaire-turbulente aux parois actives et la stratification centrale, tandis que le rayonnement de gaz ne semble impacter que les couches limites des parois horizontalesThe influence of radiative transfer on natural convection flows in cavities is studied numerically in turbulent regimes. The study considers DNS and LES approaches for the convection problem and discrete ordinate method (MOD) to solve the radiative problem combined with the SLW real gas model. The studied configuration is based on an experimental differentially heated cavity in air located at the Pprime Institut with a vertical aspect ratio of 4, for Rayleigh numbers ranging from 1,5x109 to 1,2x1011. The first part of the study focuses on hybrid MPI + OpenMP parallelization of the DOM. The methods developed show performance improvements of 13 to 1600% compared to the classical wavefront method. Then, a study of convection-wall radiation coupling is achieved through a flow sensitivity study to walls emissivities for different values of the Rayleigh number. Then, the gas radiation is added, and its impact is measured through a variation of the relative humidity of the dry air + steam. The results are compared to the case of a convectively adiabatic cavity (i.e. zero convective flux at the passive walls). Radiative transfers have the effect of reducing the central thermal stratification and increase the overall dynamics of the flow. The emissivity of the passive walls drives the location of the laminar-turbulent transition on the active walls and the central thermal stratification, while the gas radiation seems to impact the boundary layers of the horizontal walls
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Hussain, Muzzamal. „Couplage procédé / propriétés mécaniques des matériaux sandwiches Métal / Composite hybride à base de tissus en jute“. Thesis, Lille, 2021. http://www.theses.fr/2021LILUI006.
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Dans cette étude, les propriétés mécaniques des FML renforcés de jute tissé 3D et hybrides de jute tissé 3D renforcé ont été étudiées. Le renfort tissé 3D à quatre couches a été fabriqué avec du fil de jute en utilisant quatre types de motifs imbriqués, par ex. Orthogonal Through Thickness OTT et Orthogonal Layer to Layer OLL imbriqué. La technique d'infusion sous vide a été utilisée pour la fabrication de FML avec renfort en jute tissé 3D. Après l'optimisation du renforcement tissé 3D, les FML renforcés hybrides ont été développés dans lesquels le tissu tissé OTT 3D a été pris en sandwich entre une peau tissée 2D. Quatre types de fibres différents ont été utilisés pour fabriquer une peau tissée 2D, par ex. jute, aramide, carbone et verre tandis que trois types différents de matrice ont été utilisés, par ex. époxy, PVB et PP. La presse à chaud par compression a été utilisée pour développer des FML hybrides renforcés. L'aluminium utilisé pour fabriquer tous les FML a été anodisé avant d'être utilisé pour la fabrication. Les propriétés adhésives ont été étudiées pour vérifier la qualité du traitement de surface, la liaison métal-composites et l'effet des fibres et de la matrice. Les propriétés monotones et dynamiques ont également été étudiées. Les propriétés adhésives ont été caractérisées à l'aide de tests de pelage en T et de pelage au rouleau flottant. Les propriétés monotones ont été analysées à l'aide d'essais de traction et de flexion. Les performances d'impact à faible vitesse ont été déterminées en utilisant un test d'impact à faible vitesse. Les résultats ont montré que la surface en aluminium anodisé avait une énergie libre de surface élevée, de sorte que le meilleur mouillage de l'aluminium peut être obtenu par anodisation par rapport à d'autres types de préparations de surface. Les résultats de l'analyse du collage ont montré que les propriétés de délaminage étaient principalement influencées par la nature du matériau adhésif plutôt que par le type de structures de renforcement. La nature de la matrice influence également le type de défaillance car avec l'époxy, la défaillance dominante était cohésive tandis qu'avec la matrice thermoplastique, elle s'est transformée en défaillance adhésive et intra-laminaire. La plasticité et la ductilité de la matrice ont plus influencé les propriétés finales que le type de rupture, malgré la rupture cohésive de l'époxy, la matrice thermoplastique avait plus de force de délamination. Les propriétés de traction et de flexion des FML renforcées de jute tissé OTT 3D étaient supérieures à celles des FML renforcées tissées OLL 3D en raison de la fraction de volume de métal plus élevée, ce qui était possible grâce à une construction plus serrée du tissu OTT. Les propriétés de traction et de flexion des composites hybrides renforcés et des FML ont été influencées par le type de matrice et le matériau de la peau 2D. Les propriétés globales plus élevées ont été obtenues avec une matrice époxy suivie d'une matrice PVB. Les FML à base de PVB ont montré que leurs propriétés étaient comparables à celles de l'époxy. Le test de flexion a montré que les FML hybrides à base de PP échouaient prématurément en raison d'une délamination entre la peau synthétique et l'âme tissée 3D. L'époxy et le PVB ont montré une meilleure imprégnation du renfort contrairement au PP dans lequel seul un verrouillage mécanique a été observé. Les propriétés d'impact dynamique des composites hybrides et des FML ont montré que les caractéristiques de dissipation d'énergie étaient influencées par la matrice et l'hybridation du renforcementIn current study the mechanical properties of 3D woven jute reinforced and hybrid 3D woven jute reinforced FMLs were investigated. The four-layered 3D woven reinforcement was made with jute yarn using four types of interlocking patterns e.g. Orthogonal Through Thickness OTT and Orthogonal Layer to Layer OLL interlocking. The vacuum infusion technique was used for the fabrication of FMLs made with 3D woven jute reinforcement. After the optimization of 3D woven reinforcement the hybrid reinforced FMLs were developed in which OTT 3D woven fabric was sandwiched between 2D woven skin. Four different kinds of fibres were used to make 2D woven skin e.g. jute, aramid, carbon, and glass while three different kinds of matrix were employed, e.g. epoxy, PVB and PP. The compression hot press was used to develop hybrid reinforced FMLs. Aluminium used to make all FMLs was anodized before using for fabrication. The adhesive properties were investigated to check the quality of surface treatment, metal-composites bonding and effect of fibres and matrix. Both monotonic and dynamic properties were also investigated. The adhesive properties were characterized using t-peel and floating roller peel tests. The monotonic properties were analyzed using tensile and flexural tests. The low velocity impact performance was determined using drop weight low velocity impact test. The results showed that the anodized aluminium surface had high surface free energy so the better wetting of aluminium can be achieved by anodizing as compared to other type of surface preparations. The adhesive bonding analysis results showed that the delamination properties were mainly influenced by the nature of adhesive material rather than the type of structures of reinforcement. The nature of the matrix also influences the type of failure as with the epoxy the dominant failure was cohesive while with thermoplastic matrix it changed to adhesive and intra-laminar failure. The plasticity and ductility of matrix influenced the final properties more than the type of failure, in spite of cohesive failure of epoxy the thermoplastic matrix had more delamination force. The tensile and flexural properties of OTT 3D woven jute reinforced FMLs were higher than the OLL 3D woven reinforced FMLs due to the higher metal volume fraction, this was possible due to tighter construction of OTT fabric. The tensile and flexural properties of hybrid reinforced composites and FMLs were influenced by the type of matrix and material of 2D skin. The overall higher properties were achieved with an epoxy matrix followed by PVB matrix. The PVB-based FMLs showed that their properties were comparable with the epoxy. The flexural test showed that hybrid FMLs based on PP were failed prematurely due to delamination between synthetic skin and 3D woven core. Both epoxy and PVB showed better impregnation of the reinforcement unlike PP in which only mechanical interlocking was seen. The dynamic impact properties of hybrid composites and FMLs showed that the energy dissipation characteristics were influenced by matrix and hybridization of reinforcement
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Preynas, Melanie. „Etude du couplage linéaire et non-linéaire de l' onde hybride basse aux plasmas de Tokamaks“. Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4060.
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Afin de générer des plasmas performants sur de longues durées, un tokamak nécessite des dispositifs de chauffage et de génération de courant additionnels. Des antennes haute-fréquences, délivrant des puissances de plusieurs mégawatts au plasma, sont actuellement utilisées dans de nombreux tokamaks. Pour optimiser les performances de chauffage et de génération de courant obtenues avec le système LH (fréquence de quelques gigahertz), une bonne maitrise du couplage de l'onde émise par l'antenne au plasma de bord est nécessaire. Or, des effets non-linéaires dépendant du niveau de puissance HF injectée dans le plasma perturbent fortement le couplage de l'onde LH pour certains paramètres de bord (densité et température en particulier). Les travaux présentés dans ce manuscrit portent sur l'étude du couplage linéaire et non-linéaire de l'onde LH au plasma de bord. Dans le cadre de l'installation d'une antenne dite « Passive Active Multijunction » en 2009 sur le tokamak Tore Supra visant à tester le système LH proposé pour ITER, la caractérisation du couplage obtenu avec cette antenne a été réalisée à partir d'expériences menées à basse puissance sur Tore Supra. Les résultats, analysés conjointement avec l'utilisation d'un code de couplage (ALOHA), ont ainsi validé les prédictions théoriques prévoyant de bonnes propriétés de couplage à des densités de plasma de bord faibles. Par ailleurs, l'effet pondéromoteur a été clairement identifié comme responsable de la forte détérioration du couplage de l'onde mesurée sous certaines conditions de plasma de bordIn order to achieve long pulse operation with a tokamak, additional heating and current drive systems are necessary. High frequency antennas, which deliver several megawatts of power to the plasma, are currently used in several tokamaks. Moreover, a good control of the coupling of the wave launched by the antenna to the edge plasma is required to optimize the efficiency of heating and current drive LH systems. However, non-linear effects which depend on the level of injected power in the plasma strongly damage the coupling of the LH wave at particular edge parameters (density and temperature profiles). Results presented in the manuscript deal with the study of the linear and non-linear coupling of the LH wave to the plasma. In the framework of the commissioning of the Passive Active Multijunction antenna in 2009 on the Tore Supra tokamak aiming at validating the LH system suggested for ITER, the characterisation of its coupling properties was realized from low power experiments. The experimental results, which are compared with the linear coupling code ALOHA, have valided the theoretical predictions of good coupling at edge plasma density around the cut-off density. Besides, the ponderomotive effect is clearly identified as responsible for the deterioration in the coupling of the wave, which is measured under particular edge plasma conditions. A theoretical model combining the coupling of the LH wave with the ponderomotive force is suggested to explain the experimental observations
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Nolin, Guillaume. „Une méthode de couplage RANS/LES zonal pour la simulation instationnaire d'écoulements turbulents complexes“. Paris 6, 2007. http://www.theses.fr/2007PA066714.
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La pertinence des méthodes de couplage RANS/LES zonal pour la simulation instationnaire d’écoulements turbulents est présentée. Les problèmes à résoudre pour mettre en place une stratégie de couplage zonal sont exposés. Parmi ceux-ci deux sont traités. Le premier est l’amélioration des stratégies de couplage zonal afin d’étendre la zone d’influence LES le plus loin possible dans le domaine RANS. La solution proposée consiste en une méthode originale de reconstruction de la viscosité turbulente RANS à partir de champs LES, alliée à une fonction corrigeant le modèle de turbulence RANS. Le second est la génération d’une turbulence réaliste en entrée des domaines LES par enrichissement des solutions RANS, afin de réduire au maximum la taille des domaines LES. Il est résolu en utilisant des conditions d’entrée instationnaire pour la LES reposant sur des bases de données. Ces techniques sont évaluées sur un écoulement autour d’un profil d’aile à grand nombre de Reynolds et à forte incidenceThe relevance of the zonal RANS/LES coupling methods for the unsteady simulation of turbulent flows is presented. The problems to be solved in order to develop a strategy of zonal coupling are outlined. Two of these problems are addressed. The first one is the improvement of the strategies of the zonal coupling to extend the area of influence of the LES zone in the RANS zone as far as possible. The proposed solution is based on an original RANS eddy viscosity reconstruction method, combined with a correction for the RANS turbulence model. The second one deals with the generation of a realistic turbulence at the inflow of the LES domains thanks to an enrichment of the RANS solutions, in order to reduce as much as possible the size of the LES domains. This turbulence is generated through LES inflow conditions based on databases. These techniques are applied to the flow around an airfoil at high Reynolds number and high angle of attack
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Marinach, Carine. „Couplage orthogonal entre un piège ionique et un analyseur temps de vol IT/O-reTOF“. Paris 6, 2002. http://www.theses.fr/2002PA066247.
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Cadet, Laurent. „Etude du couplage convection-rayonnement en cavité différentiellement chauffée à haut nombre de Rayleigh en ambiances habitables“. Electronic Thesis or Diss., La Rochelle, 2015. http://www.theses.fr/2015LAROS022.
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L'influence des transferts radiatifs sur les écoulements de convection naturelle en cavités habitables est étudié numériquement en régimes turbulents. L'étude considère des approches DNS et LES pour le problème de convection et une méthode des ordonnées discrètes (MOD) pour la résolution du problème radiatif combinée au modèle de gaz réel SLW. La configuration étudiée est basée sur une cavité différentiellement chauffée expérimentale en air située à l'institut PPRIME, de rapport d'aspect vertical 4, pour des nombres de Rayleigh allant de 1,5x109 à 1,2x1011. La première partie de l'étude se focalise sur les techniques de parallélisations hybrides MPI + OpenMP de la MOD. Les méthodes développées montrent une amélioration des performances de 13 à 1600% pour des niveaux d'hybridations élevés par rapport à la méthode classique de front d'onde. Puis, une étude du couplage convection-rayonnement surfacique est réalisée au travers d'une étude de sensibilité de l'écoulement vis-à-vis des émissivités de parois pour différentes valeurs du nombre de Rayleigh. Ensuite, le rayonnement volumique du gaz est ajouté, et son impact est évalué au travers d'une variation du taux d'humidité relative du mélange air sec/vapeur d'eau. Les résultats obtenus sont comparés aux cas d'une cavité convectivement adiabatique (i.e. flux convectif nul aux parois passives). Les transferts radiatifs ont pour effet de diminuer la stratification thermique centrale et d’augmenter la dynamique générale de l'écoulement. L'émissivité des parois passives pilote principalement la localisation de la transition laminaire-turbulente aux parois actives et la stratification centrale, tandis que le rayonnement de gaz ne semble impacter que les couches limites des parois horizontalesThe influence of radiative transfer on natural convection flows in cavities is studied numerically in turbulent regimes. The study considers DNS and LES approaches for the convection problem and discrete ordinate method (MOD) to solve the radiative problem combined with the SLW real gas model. The studied configuration is based on an experimental differentially heated cavity in air located at the Pprime Institut with a vertical aspect ratio of 4, for Rayleigh numbers ranging from 1,5x109 to 1,2x1011. The first part of the study focuses on hybrid MPI + OpenMP parallelization of the DOM. The methods developed show performance improvements of 13 to 1600% compared to the classical wavefront method. Then, a study of convection-wall radiation coupling is achieved through a flow sensitivity study to walls emissivities for different values of the Rayleigh number. Then, the gas radiation is added, and its impact is measured through a variation of the relative humidity of the dry air + steam. The results are compared to the case of a convectively adiabatic cavity (i.e. zero convective flux at the passive walls). Radiative transfers have the effect of reducing the central thermal stratification and increase the overall dynamics of the flow. The emissivity of the passive walls drives the location of the laminar-turbulent transition on the active walls and the central thermal stratification, while the gas radiation seems to impact the boundary layers of the horizontal walls
Bücher zum Thema "Couplage hybride"
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Nguỹên, Trọng Khôi. Couplage d'ondes pour le chauffage des plasmas à la fréquence hybride basse. Grenoble: A.N.R.T. Université Pierre Mendès France Grenoble 2, 1986.
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McGuiness, C. L., R. K. Smith, M. E. Anderson, P. S. Weiss und D. L. Allara. Nanolithography using molecular films and processing. Herausgegeben von A. V. Narlikar und Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533060.013.23.
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This article focuses on the use of molecular films as building blocks for nanolithography. More specifically, it reviews efforts aimed at utilizing organic molecular assemblies in overcoming the limitations of lithography, including self-patterning and directed patterning. It considers the methods of patterning self-assembled organic monolayer films through soft-lithographic methods such as microcontact printing and nanoimprint lithography, through direct ‘write’ or ‘machine’ processes with a nanometer-sized tip and through exposure to electron or photon beams. It also discusses efforts to pattern the organic assemblies via the physicochemical self-assembling interactions, including patterning via phase separation of chemically different molecules and insertion of guest adsorbates into host matrices. Furthermore, it examines the efforts that have been made to couple patterned molecular assemblies with inorganic thin-film growth methods to form spatially constrained, three-dimensional thin films. Finally, it describes a hybrid self-assembly/conventional lithography (i.e. molecular rulers) approach to forming nanostructures.
Buchteile zum Thema "Couplage hybride"
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Pfeifer, Denis, Andreas Baumann, Marco Giani, Christian Scheifele und Jörg Fehr. „Hybrid Digital Twins Using FMUs to Increase the Validity and Domain of Virtual Commissioning Simulations“. In Advances in Automotive Production Technology – Towards Software-Defined Manufacturing and Resilient Supply Chains, 200–209. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27933-1_19.
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AbstractThe main objective of virtual commissioning is to help design and validate the control systems of entire production plants. Therefore, simulations on a logical and kinematic level are performed, typically in a Software- or Hardware-in-the-Loop configuration using the original control software and controller [1].However, the lack of level of detail means that this type of simulation is insufficient for an integrated system dynamics and control algorithms design. These engineering tasks are currently performed in separate tools, e.g. by finite element analysis, multibody simulations or by a combination, i.e. elastic multibody systems (EMBS) [2]. However, the designed components are only considered individually and not in the context of the control technology used. Therefore, primarily synthetic inputs are used and not the original control behavior. With a higher level of simulation detail, further questions about the system, such as the effect of control algorithms on the dynamic processes, can be virtually validated.Therefore, this paper explores hybrid component-based digital twins to combine the advantages of both VC and EMBS. Hybrid components allow the simulation of the interactions between process, machine and control system with a high level of detail where this is beneficial. Such integration is achieved using the Functional Mock-up Interface (FMI) to couple different simulation models in a co-simulation environment [3]. This is demonstrated in a simulation use case of an inverted pendulum. The level of detail of individual components in the virtual commissioning tool ISG-virtuos [4] is increased by the modular integration of elastic multibody simulations via FMI so that the swing-up controller can be designed in the simulation.
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Salzbrunn, Monika, und Birgit Ellinghaus. „How Does “Migrant” and “World” Music Change Local and National Cultures? An Insight from the Cologne Carnival, Related Antiracist Networks and Recent Cultural Politics“. In IMISCOE Research Series, 117–35. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-39900-8_7.
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AbstractNina Glick Schiller and Ayse Çağlar have invited migration scholars to constructively question the transnational paradigm by “locating migration”. Based on our work on the dynamics of the Cologne carnival, this chapter assesses the impact of “migrant” and “world” music on local and national cultural policies.Cologne’s history has always been shaped by migration, even though the enrichment of the music and carnival scene, thanks to migrants, has been recognised and celebrated only for a couple of decades. Over the last 30 years, Cologne’s carnival as well as the broader music scene in Cologne has undergone profound changes: new repertories pertaining to different social and religious references, updated lyrics of songs, hybrid styles with sources from musicians with multiple origins and links between the anti-Nazi resistance movements and current anti-fascist initiatives. Diversification processes have been initiated both top-down and bottom-up, leading to resilient changes concerning the use of musical references and the visibility of new cultural actors. We analyse the creativity and openness of the cultural scene of Cologne, taking into consideration political consciousness, decision-making and the re-shaping of institutions and the short- and long-term strategies and effects of cultural politics. Starting from a local case study, we broaden our perspective to regional dynamics and put these in a broader national and supranational context.
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Parfitt, Tudor. „“The Truth of the Origination of the World and Mankind”“. In Hybrid Hate, 1–31. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190083335.003.0001.
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The Judeo-Christian tradition maintains that humankind derives from the first couple in the Garden of Eden. St. Augustine even included the so-called monstrous races in the overall category of humanity. This consensus started to fragment in the sixteenth century with the work of Paracelsus and later Giordano Bruno, when alternative theories were put forward to account for human diversity. Their work was followed by others, including Julius Caesar Vanini, Isaac La Peyrère, John Atkins, Voltaire, François Bernier, Carl Linnaeus, Georges Cuvier, Edward Long, and Lord Kames. For most of them, the black and the Jew were the great obstacles to the unity of mankind.
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Bogatinov, Dimitar, und Goce Stevanoski. „Use of Technological Advances Against Hybrid-Based Threats in SEE“. In Building Cyber Resilience against Hybrid Threats. IOS Press, 2022. http://dx.doi.org/10.3233/nicsp220021.
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The last couple of years has constantly shown that ICT can and is used to destabilize and undermine societies and countries using hybrid-based tools and methodologies. Russia’s hybrid war against Ukraine is a clear example of the strength that the hybrid threats pose. Due to its position and previous war conflicts, countries from South-East Europe (SEE) are constantly targeted under the threat of hybrid threats. This chapter gives an overview of the nontechnical measures that can be applied to increase the resilience in the SEE region, and an overview of the AI (Artificial intelligence) based tools and techniques that can be used to generate and combat hybrid threats, especially the disinformation and fake news.
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De Florio, Vincenzo. „Hybrid Approaches“. In Application-Layer Fault-Tolerance Protocols, 275–300. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-182-7.ch009.
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This chapter describes some hybrid approaches for application-level software fault-tolerance. All the approaches reported in the rest of this chapter exploit the recovery language approach introduced in Chapter VI and couple it with other tools and paradigms described in other parts of this book. The objective of this chapter is to demonstrate how ReL can serve as a tool to further enhance some of the application- level fault-tolerance paradigms introduced in previous chapters. But why hybrid approaches in the first place? The main reason is that joining two or more concepts and their “system structures” (Randell, 1975), that is, the conceptual and syntactical axioms used in disparate application-level software fault-tolerance provisions, one comes up with a tool with better Syntactical Adequacy (the SA attribute introduced in Chapter II). As already mentioned, a wider syntactical structure can facilitate the expression of our codes, while on the contrary awkward structures often lead to clumsy, buggy applications. Hybrid approaches are often more versatile and can also inspire brand new designs. A drawback of hybrid approaches is that they are modifications of existing designs. The extra design complexity must be carefully added to prevent the introduction if design faults in the architecture.
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Hendriks, Frank. „Conclusion“. In Rethinking Democratic Innovation, 203–16. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780192848291.003.0009.
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Abstract This chapter continues and concludes with forward-looking reflections on hybrid democratic innovations (HDIs) that capitalize on tensions between opposites. This feeds into the hybrid-innovations hypothesis, which posits that more versatile and connective democratic innovations stand a better chance of a high performance on a broader spectrum than democratic innovations that fall short of these qualities. The most advanced hybrid innovations couple diverging forms of bottom-up pressure, and keep representative democracy connected and on its toes. Hybrid democratic innovations may be desirable as well as possible, as this book contends, but they also come with challenges and questions reflected on in this final chapter. A strategy of change based on connecting opposites requires great effort, the cognitive agility to rethink democratic innovation, and a good deal of practical wisdom to effectuate it. Done properly, it is proposed that this is valuable and worth our while.
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Lähdeoja, Otso. „GUITARE AUGMENTÉE : ANALYSE DU DÉVELOPPEMENT D’INSTRUMENTS HYBRIDES, APPUYÉE PAR DEUX ÉTUDES DE CAS“. In Quand la guitare [s']électrise!, 115–40. Sorbonne Université Presses, 2022. http://dx.doi.org/10.70551/cwmw4761.
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Partant d’une analyse de la guitare électrique en tant qu’instrument augmenté, nous présentons une suite de recherches sur l’augmentation de la guitare électrique et acoustique, effectuées par l’auteur durant les cinq dernières années. En premier lieu, nous abordons le contrôle des effets de la guitare électrique par une série de travaux sur des capteurs attachés à la guitare et opérables par l’instrumentiste. De nouveaux couplages geste-son sont ainsi créés dans la relation instrumentale, permettant d’introduire le contrôle de traitement du signal dans le vocabulaire gestuel de la guitare. Dans un second temps, nous présentons la stratégie d’extraction de données liées au geste à partir du signal capté sur la guitare en hexaphonie. Des analyses du signal effectuées dans les domaines temporel et spectral offrent un ensemble de descripteurs qui peuvent être employés pour le contrôle de traitements du signal. Le troisième moment de l’exposé traite de l’augmentation de la guitare acoustique (cordes nylon et acier) par l’introduction de l’acoustique active. Par acoustique active, nous entendons des vibrations induites dans le corps de la guitare par des actuateurs acoustiques. Le son acoustique de la guitare peut ainsi être doublé par des sons électroniques, et une boucle de « captation – traitement – actualisation » peut être instaurée sur l’instrument. Une guitare hybride – électroacoustique – est ainsi créée, permettant de travailler sur une esthétique de « musique de chambre électronique » : une musique mixte sans haut-parleurs traditionnels, où les sons électroniques émanent des instruments acoustiques.
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Upadhyay, Prachi, und Sankar Chakma. „Physical Insight into Ultra-low Desulfurization of Liquid Fuels using Sono-hybrid Fenton Reaction“. In Ultrasound Technology for Fuel Processing, 280–99. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815049848123010017.
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The sulfur-containing hydrocarbons are the main source of SOx and CO2 gas emissions, which is a threat to the environment for sustainability development. According to the US environment protection agency, the sulfur content should be within the limit of 15 ppm and 30 ppm for diesel and gasoline, respectively. Also, a couple of advanced techniques have been developed so far for the removal of sulfur from fuels. Among these techniques, ultrasound-based advanced oxidation processes have been found to be more efficient and effective for sulfur removal. In this chapter, we have discussed the physical and chemical mechanism of ultrasound based advanced oxidation processes including the influences of process parameters such as pH, the concentration of sulfur, concentration of oxidant, presence of phase transfer catalyst, oxalate ions, etc. Also, several hybrid techniques are discussed with their advantages and disadvantages for obtaining ultra-low sulfur fuel.
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Al-Mssallem, Muneera Q., Krishnananda P. Ingle, Gopal W. Narkhede, S. Mohan Jain, Penna Suprasanna, Gholamreza Abdi und Jameel M. Al-Khayri. „Hassawi Rice (Oryza Sativa L.) Nutraceutical Properties, In Vitro Culture and Genomics“. In In Vitro Propagation and Secondary Metabolite Production from Medicinal Plants: Current Trends (Part 1), 142–68. BENTHAM SCIENCE PUBLISHERS, 2024. http://dx.doi.org/10.2174/9789815165227124010010.
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An indigenous reddish-brown landrace rice of the indica variety known as Hassawi rice (Oryza sativa L.) is cultivated in Saudi Arabia. This rice variety has both nutritive and non-nutritive bioactive components that have therapeutic potential and promote favorable metabolic profiles. Hassawi rice has health advantages that should be further investigated, especially for the treatment of diabetes and obesity. There is a direct need for the conservation and improvement of this important germplasm source. Breeding efforts are limited, although a couple of hybrids were developed. Biotechnology approaches offer effective tools for crop genetic improvement. In this direction, in vitro regeneration of this crop has been developed that enabled the evaluation of abiotic stress factors. Furthermore, recent genomic studies revealed that Hassawi rice harbors novel alleles for salinity tolerance. This chapter reviews the research carried out on Hassawi rice in relation to nutritional and health benefits as well as secondary metabolites bioactivity and progress made on in vitro culture and genomics.
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Kartini, Indriana, und Adhi Dwi Hatmanto. „Natural Dyes: From Cotton Fabrics to Solar Cells“. In Dyes and Pigments - Novel Applications and Waste Treatment. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97487.
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This article will discuss natural dyes’ role, from colouring the cotton fabrics with some functionality to harvesting sunlight in the dye-sensitized solar cells. Natural dye colourants are identical to the low light- and wash-fastness. Therefore, an approach to improving the colourant’s physical properties is necessary. Colouring steps employing silica nanosol and chitosan will be presented. The first part will be these multifunctional natural dye coatings on cotton fabrics. Then, functionality such as hydrophobic surfaces natural dyed cotton fabrics will be discussed. Natural dyes are also potential for electronic application, such as solar cells. So, the second part will present natural dyes as the photosensitizers for solar cells. The dyes are adsorbed on a semiconductor oxide surface, such as TiO2 as the photoanode. Electrochemical study to explore natural dyes’ potential as sensitizer will be discussed, for example, natural dyes for Batik. Ideas in improving solar cell efficiency will be discussed by altering the photoanode’s morphology. The ideas to couple the natural dyes with an organic–inorganic hybrid of perovskite and carbon dots are then envisaged.
Konferenzberichte zum Thema "Couplage hybride"
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Sharma, Satish C., und Nathi Ram. „Influence of Couple Stress Lubricant on the Performance of Orifice Compensated Non-Recessed Hole-Entry Hydrostatic/Hybrid Journal Bearing“. In ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61013.
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The lubricants are generally additized in order to enhance their lubricating properties. As a consequence of this, they exhibit nonlinear relationship between the shear stress and shear strain. One class of lubricants which has received considerable attention in recent years is the couple stress lubricants. The study of couple stress fluid flows has been the subject of increased interest owing to its widespread industrial and scientific applications such as synthetic fluids, polymer-thickened oils, liquid crystals and animal bloods. The present work is therefore aimed to study analytically the influence of couple stress lubricant on the performance of an orifice compensated non-recessed hole-entry hydrostatic/hybrid journal bearings. The modified Reynolds equation based on Stoke’s couple stress fluid theory has been solved by using the Finite Element Method. The numerically simulated results have been presented for various valves of couple stress parameters and external loads. The numerically simulated results reveal that the influence of couple stress lubricant increases the value of minimum fluid film thickness at constant value of external load for hybrid journal bearing vis-a-vis Newtonian lubricant. Further, it has been observed that the value of direct fluid film damping coefficient (C22) is larger for hydrostatic journal bearing lubricated with couple stress lubricant.
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Ross, James A., David A. Richie, Song J. Park, Dale R. Shires und Brian J. Henz. „A Class-Structured Approach to Couple Application and Hybrid Core Parallelism“. In 2014 22nd Euromicro International Conference on Parallel, Distributed and Network-Based Processing (PDP). IEEE, 2014. http://dx.doi.org/10.1109/pdp.2014.41.
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Chen, Hao, Chen Yang, Nana Zhou, Nor Farida Harun und David Tucker. „Performance Comparison of Internal and External Reforming for Hybrid SOFC-GT Applications by Using 1D Real-Time Fuel Cell Mode“. In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91920.
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Abstract Solid oxide fuel cells integrated with gas turbine (SOFC-GT) systems are considered among the most promising power generation units, not only because of the high efficiency, low emissions and carbon capture ability, but also the flexibility to use different kinds of fuels such as natural gas, syngas and biogas directly. In the case of natural gas, Previous researches have demonstrated that solid oxide fuel cells possess the ability to utilize natural gas directly by reforming it inside the anode because of the high operating temperature. But the major problem of internal reforming is that it increases the temperature gradient at the leading edge of fuel cell which may lead to high thermal stress and damage the cells. On the other side, external reforming requires an additional reformer outside of fuel cell, which may increase the investment costs. Also, the amount of air needed to cool the fuel cell is doubled, compared with internal reforming. A full comparison between internal reforming and external reforming of the pressurized SOFC is needed for the hybrids application. In this paper, a real time equilibrium reformer model based on minimization of Gibbs free energy was built to couple with 1D real time solid oxide fuel cell model. An internal on-anode reforming SOFC stack configuration for hybrid SOFC-GT system application was compared with external reforming configurations with 800K, 900K and 1000K reforming temperatures. The results show that internal reforming provides better performance of SOFC stack in the case of high fuel utilization. However, the external reforming showed a higher stack efficiency and smaller stack size compared with on-anode reforming when keeping a relatively lower SOFC stack fuel utilization, necessarily for high hybrid efficiency. Results indicated that external and internal reforming of fuel needs to be optimized depending on different design conditions of the entire hybrid system in terms of efficiency and investment cost. This paper shows that the hybrid system provides the opportunities for thermal integration on performance and efficiency improvement over fuel cell anode reforming.
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Druffel, Thad, Venkat Kalyan Vendra, Delaina Amos und Mahendra Sunkara. „Engineering the Photoanode Using Scalable Hybrid Nanostructures“. In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54433.
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Dye sensitized solar cells (DSSCs) have garnered a great deal of interest as a cost-effective technology for large-scale manufacturing. Engineered inorganic hybrid nanostructures can improve the performance of DSSC’s without affecting the cost effectiveness of the devices. Here, we present a concept of engineered hybrid nanostructures, incorporating appropriate selection of nanowire and nanoparticle materials, to enhance the charge transport and reduce the recombination within the photoanode. Low recombination properties of this photoanode allow flexibility in choosing the redox couple for increasing open circuit voltage.
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Serpi, Alessandro, und Paolo Attilio Pegoraro. „A Hybrid Control System for LC filters that couple Energy Storage Systems with AC grids“. In IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2020. http://dx.doi.org/10.1109/iecon43393.2020.9255283.
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Aruchamy, Sathishkumar, Soundararajan Ranganathan, Sathish Kumar K, Akilesh Ramasamy und Gokulkumar Thambusamy. „Design and Couple Field Analysis of Uncoated and Coated Aluminium Metal Matrix Hybrid Composite Piston“. In International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0391.
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Taryana, Yana, Yaya Sulaeman, Teguh Praludi, Yuyu Wahyu und Arief Budi Santiko. „Down-Conversion Mixer Using Quadrature Hybrid Couple and Schottky Diode for S-Band Radar Application“. In 2018 3rd International Conference on Information Technology, Information System and Electrical Engineering (ICITISEE). IEEE, 2018. http://dx.doi.org/10.1109/icitisee.2018.8721003.
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Shojaei, Arman, Mirco Zaccariotto und Ugo Galvanetto. „On the Coupling of Peridynamics With a Meshless Method Based on Classical Elasticity“. In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65340.
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In this paper we introduce a simple and efficient approach to couple a discretized Peridynamic model with a meshless method based on classical continuum mechanics. The coupling is done through a complete meshless style without producing any ghost forces in the transition region. We shall show with such type of coupling it is possible to reproduce the solution of a pure Peridynamic model by a hybrid meshless method with lower computational cost.
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Zheng, Feng Jie, Fu Zheng Qu und Xue Guan Song. „A Hybrid Model to Analyze the Fluid-Structure Interaction Phenomenon of a Relief System and Experimental Validation“. In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93779.
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Abstract As one essential component of a pressurized system, a relief valve is used to guarantee the pressure within a prescribed range. But in practical engineering, pressure fluctuation caused by the operation of a relief valve will travel along the pipeline and couple with the motion of the valve, which might result in malfunction of the valve and the system. In order to investigate the fluid-structure interaction (FSI) phenomenon, a hybrid model combining the method of characteristics (MOC) and computational fluid dynamics (CFD) method is proposed. In the hybrid FSI model, the characteristics of pressure resource is modeled using the performance curves, the compressible gas transmitting in the pipe is calculated by one-dimensional MOC, and the air flow in the valve as well as the valve motion is simulated by a two-dimensional CFD model. To validate the hybrid model, 1:1 scaled test rig is conducted. The compared results show that the hybrid model not only can accurately capture the pressure fluctuation in straight pipeline induced by the closure of the valve but also can accurately predict the forms of the valve motion.
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Fidanoglu, Melih, Elgiz Baskaya, Guven Komurgoz und Ibrahim Ozkol. „Application of Differential Quadrature Method and Evolutionary Algorithm to MHD Fully Developed Flow of a Couple-Stress Fluid in a Vertical Channel With Viscous Dissipation and Oscillating Wall Temperature“. In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20137.
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In this paper, fully developed flow of a couple-stress fluid between two long vertical walls in presence of viscous dissipation and radiative heat flux with heat and mass transfer is considered. Temperature and concentration fields at one of the walls are oscillating around a non-zero value. The coupled equations governing the problem are discretized using Differential Quadrature Method, and solved using Newton-Raphson Method and Evolutionary Algorithm hybrid scheme. The expressions for velocity, temperature, and concentration fields for fully developed unsteady flow are obtained.