Relevant bibliographies by topics / Interface oscillations

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Interface oscillations'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Interface oscillations"

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Kozlov, Victor, Stanislav Subbotin, and Ivan Karpunin. "Supercritical Dynamics of an Oscillating Interface of Immiscible Liquids in Axisymmetric Hele-Shaw Cells." Fluids 8, no. 7 (July 12, 2023): 204. http://dx.doi.org/10.3390/fluids8070204.

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The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large contrast in viscosity. The axis of symmetry of the cell is oriented vertically; the interface without oscillations is axially symmetric. An oscillating pressure drop is set at the cell boundaries, due to which the interface performs radial oscillations in the form of an oscillating “tongue” of a low-viscosity liquid, periodically penetrating into a more viscous liquid. An increase in the oscillation amplitude leads to the development of a system of azimuthally periodic structures (fingers) at the interface. The fingers grow when the viscous liquid is forced out of the layer and reach their maximum in the phase of maximum displacement of the interface. In the reverse course, the structures decrease in size and, at a certain phase of oscillations, take the form of small pits directed toward the low-viscosity fluid. In a conical cell, a bifurcation of period doubling with an increase in amplitude is found; in a flat cell, it is absent. A slow azimuthal drift of finger structures is found. It is shown that the drift is associated with the inhomogeneity of the amplitude of fluid oscillations in different radial directions. The fingers move from the region of a larger to the region of a lower amplitude of the interface oscillations.
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Liu, Cheng, Guowei Cai, Deyou Yang, Zhenglong Sun, and Mingna Zhang. "The Online Identification of Dominated Inter-area Oscillations Interface Based on the Incremental Energy Function in Power System." Open Electrical & Electronic Engineering Journal 10, no. 1 (September 30, 2016): 88–100. http://dx.doi.org/10.2174/1874129001610010088.

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The online identification of power system dominated inter-area oscillations interface based on the incremental energy function method is proposed in this paper. The dominant inter-area oscillations interface can be obtained by calculating branch oscillation potential energy, which is tie-line concentrated by oscillations energy. To get the oscillation energy caused by the different mechanism (free oscillation and forced oscillation), different fault position, different oscillation source. Power system dominated inter-area oscillations interface can be effectively obtained by proposed method, at the same time, dominated inter-area oscillations clusters also can be obtained. Finally, damping property of power system is effectively improved by configurating series damping controller in the dominant oscillation profile. The accuracy of the dominant oscillation interface identification is verified in this paper. At the same time, the proposed approach can also provides the basis for the configuration of damping control based on line.
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Kozlov, Viktor, and Olga Vlasova. "Oscillatory dynamics of immiscible liquids with high viscosity contrast in a rectangular Hele–Shaw channel." Physics of Fluids 34, no. 3 (March 2022): 032121. http://dx.doi.org/10.1063/5.0084363.

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The dynamics of the interface of liquids with a high viscosity contrast, performing harmonic oscillations with zero mean in a straight slot channel, is experimentally investigated. The boundary is located across the channel and oscillates along the channel with a harmonic change in the flow rate of the fluid pumped through the channel. Owing to the high contrast of viscosities, the motion of the more viscous liquid obeys Darcy's law, while the low-viscosity liquid performs “inviscid” oscillations. The oscillations of the interface occur in the form of an oscillating flat tongue of low-viscosity liquid that periodically penetrates into the more viscous one. The interface oscillations lead to the manifestation of two effects. One of these consists of changes in the averaged shape of the interface and the liquid contact line. The interface in the cell plane takes the form of a “hill,” the dynamical equilibrium of which is maintained by oscillations, while the deformation of the boundary is proportional to the amplitude of the oscillations and vanishes in their absence. The second effect consists of the development of finger instability of the oscillating boundary, which manifests itself in the periodic development of fingers of low-viscosity liquid at part of a period. The instability develops in a threshold manner when the relative amplitude of the interface oscillations reaches a critical value. It is found that the instability has a local character and manifests itself in those regions of the interface where the amplitude of the oscillations reaches a critical value. The stability threshold decreases with the dimensionless frequency.
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Jian, Liu, and Gyung-Min Choi. "Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface." Applied Sciences 11, no. 11 (June 1, 2021): 5155. http://dx.doi.org/10.3390/app11115155.

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Acoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer at the interface during fabrication is often challenging. In this study, we demonstrate that an amorphous CoB alloy on top of a sapphire substrate can substantially amplify acoustic oscillations. By analyzing the attenuation of acoustic oscillations, we show that a thin, soft layer with a thickness of >2 ± 1 Å exists at the interface. The intermediate layer at the interface is further verified by investigating heat transport. By analyzing the slow decrease of the temperature of the transducer layer, we determine a thermal conductance of 35 ± 5 MW m−2 K−1 at the transducer/substrate interface. This low value supports the existence of a thin, soft layer at the interface. Our results demonstrate that an amorphous metal with B alloying effectively preserves the soft nature at the interface and detects the acoustic propagation and heat transport across it.
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Kovalchuk, Nina. "Spontaneous oscillations due to solutal Marangoni instability: air/water interface." Open Chemistry 10, no. 5 (October 1, 2012): 1423–41. http://dx.doi.org/10.2478/s11532-012-0083-5.

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AbstractSystems far from equilibrium are able to self-organize and often demonstrate the formation of a large variety of dissipative structures. In systems with free liquid interfaces, self-organization is frequently associated with Marangoni instability. The development of solutal Marangoni instability can have specific features depending on the properties of adsorbed surfactant monolayer. Here we discuss a general approach to describe solutal Marangoni instability and review in details the recent experimental and theoretical results for a system where the specific properties of adsorbed layers are crucial for the observed dynamic regimes. In this system, Marangoni instability is a result of surfactant transfer from a small droplet located in the bulk of water to air/water interface. Various dynamic regimes, such as quasi-steady convection with a monotonous decrease of surface tension, spontaneous oscillations of surface tension, or their combination, are predicted by numerical simulations and observed experimentally. The particular dynamic regime and oscillation characteristics depend on the surfactant properties and the system aspect ratio.
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Ganiev, R. F., D. A. Zhebynev, and A. M. Feldman. "EXCITATION OF NONLINEAR PRESSURE OSCILLATIONS IN LOW-PRESSURE FLUID FLOW USING A HIGH-PRESSURE HYDRODYNAMIC GENERATOR." Spravochnik. Inzhenernyi zhurnal, no. 280 (July 2020): 7–13. http://dx.doi.org/10.14489/hb.2020.07.pp.007-013.

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The results of the study of the excitation process of nonlinear oscillations of finite amplitude pressure in a low-pressure (treated) fluid flow using a hydrodynamic oscillator of flow type, the working fluid of which has no direct contact with the fluid of the treated flow, are presented. It is shown that the oscillations from the hydrodynamic generator can be transmitted to the fluid flow through the interface (matching device) in the form of a disk with a certain acoustic resistance. It was found that resonant oscillations can be disturbed in the low-pressure flow processing chamber. The conditions of excitation of resonant oscillations in the processing chamber with a flowing liquid are found. Numerical values of the oscillation span and resonance frequencies are given.
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Ganiev, R. F., D. A. Zhebynev, and A. M. Feldman. "EXCITATION OF NONLINEAR PRESSURE OSCILLATIONS IN LOW-PRESSURE FLUID FLOW USING A HIGH-PRESSURE HYDRODYNAMIC GENERATOR." Spravochnik. Inzhenernyi zhurnal, no. 280 (July 2020): 7–13. http://dx.doi.org/10.14489/hb.2020.07.pp.007-013.

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The results of the study of the excitation process of nonlinear oscillations of finite amplitude pressure in a low-pressure (treated) fluid flow using a hydrodynamic oscillator of flow type, the working fluid of which has no direct contact with the fluid of the treated flow, are presented. It is shown that the oscillations from the hydrodynamic generator can be transmitted to the fluid flow through the interface (matching device) in the form of a disk with a certain acoustic resistance. It was found that resonant oscillations can be disturbed in the low-pressure flow processing chamber. The conditions of excitation of resonant oscillations in the processing chamber with a flowing liquid are found. Numerical values of the oscillation span and resonance frequencies are given.
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Soler, Roberto. "Exploring the Ideal MHD Quasi-Modes of a Plasma Interface with a Thick Nonuniform Transition." Physics 4, no. 4 (November 8, 2022): 1359–70. http://dx.doi.org/10.3390/physics4040087.

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Nonuniform plasma across an imposed magnetic field, such as those present in the solar atmosphere, can support collective Alfvénic oscillations with a characteristic damping time. The damped transverse oscillations of coronal loops are an example of this process. In ideal magnetohydrodynamics (MHD), these transient collective motions are associated with quasi-modes resonant in the Alfvén continuum. Quasi-modes live in a non-principal Riemann sheet of the dispersion relation, and so they are not true ideal MHD eigenmodes. The present study considers the illustrative case of incompressible surface MHD waves propagating on a nonuniform interface between two uniform plasmas with a straight magnetic field parallel to the interface. It is explored how the ideal quasi-modes of this configuration change when the width of the nonuniform transition increases. It is found that interfaces with wide enough transitions are not able to support truly collective oscillations. A quasi-mode that can be related with a resonantly damped surface MHD wave can only be found in interfaces with sufficiently thin transitions.
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DELOURME, BERANGERE, HOUSSEM HADDAR, and PATRICK JOLY. "ON THE WELL-POSEDNESS, STABILITY AND ACCURACY OF AN ASYMPTOTIC MODEL FOR THIN PERIODIC INTERFACES IN ELECTROMAGNETIC SCATTERING PROBLEMS." Mathematical Models and Methods in Applied Sciences 23, no. 13 (September 16, 2013): 2433–64. http://dx.doi.org/10.1142/s021820251350036x.

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We prove the well-posedness and stability properties of a parameter dependent problem that models the reflection and transmission of electromagnetic waves at a thin and rapidly oscillating interface. The latter is modeled using approximate interface conditions that can be derived using asymptotic expansion of the exact solution with respect to the small parameter (proportional to the periodicity length of oscillations and the width of the interface). The obtained uniform stability results are then used to prove the accuracy (with respect to the small parameter) of the proposed model.
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Adamatzky, Andrew, Claire Fullarton, Neil Phillips, Ben De Lacy Costello, and Thomas C. Draper. "Thermal switch of oscillation frequency in Belousov–Zhabotinsky liquid marbles." Royal Society Open Science 6, no. 4 (April 2019): 190078. http://dx.doi.org/10.1098/rsos.190078.

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External control of oscillation dynamics in the Belousov–Zhabotinsky (BZ) reaction is important for many applications including encoding computing schemes. When considering the BZ reaction, there are limited studies dealing with thermal cycling, particularly cooling, for external control. Recently, liquid marbles (LMs) have been demonstrated as a means of confining the BZ reaction in a system containing a solid–liquid interface. BZ LMs were prepared by rolling 50 μl droplets in polyethylene (PE) powder. Oscillations of electrical potential differences within the marble were recorded by inserting a pair of electrodes through the LM powder coating into the BZ solution core. Electrical potential differences of up to 100 mV were observed with an average period of oscillation ca 44 s. BZ LMs were subsequently frozen to −1°C to observe changes in the frequency of electrical potential oscillations. The frequency of oscillations reduced upon freezing to 11 mHz cf. 23 mHz at ambient temperature. The oscillation frequency of the frozen BZ LM returned to 23 mHz upon warming to ambient temperature. Several cycles of frequency fluctuations were able to be achieved.
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Dissertations / Theses on the topic "Interface oscillations"

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Jentsch, L., D. Natroshvili, and I. Sigua. "Mixed Interface Problems of Thermoelastic Pseudo-Oscillations." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199801150.

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Three-dimensional basic and mixed interface problems of the mathematical theory of thermoelastic pseudo-oscillations are considered for piecewise homogeneous anisotropic bodies. Applying the method of boundary potentials and the theory of pseudodifferential equations existence and uniqueness theorems of solutions are proved in the space of regular functions C^(k+ alpha) and in the Bessel-potential (H^(s)_(p)) and Besov (B^(s)_(p,q)) spaces. In addition to the classical regularity results for solutions to the basic interface problems, it is shown that in the mixed interface problems the displacement vector and the temperature are Hölder continuous with exponent 0
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Nakagawa-Yoshikawa, Harunori. "Instabilités des interfaces sous oscillations." Paris 6, 2006. http://www.theses.fr/2006PA066303.

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Piedfert, Antoine Rémy. "Modélisation et simulations numériques de la dynamique des interfaces complexes." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/19947/13/Piedfert_Antoine.pdf.

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Dans les procédés liés aux émulsions, des écoulements turbulents et polyphasiques entrent en jeu. De tels procédés apparaissent dans des domaines variés. Dans l'industrie agro-alimentaire, la production de lait fait intervenir un homogénéisateur à haute pression, et certains produits tels que la mayonnaise sont des émulsions stables. On trouve aussi des émulsions dans le domaine de la santé : elles assurent le bon fonctionnement de nos poumons, tandis que d'autres peuvent être injectées par voie parentérale en tant que médicaments. On les retrouve aussi dans les procédés de séparation, par exemple eau-brut de pétrole dans l'industrie pétrochimique. Dans tous les cas, la fragmentation et la coalescence des bulles et gouttes doivent être maîtrisées, car elles influencent directement la distribution en taille de la phase dispersée. La fréquence d'apparition de ces phénomènes peut être prédite en utilisant des modèles adaptés. Cependant, la présence de molécules tensioactives modifie grandement cette fréquence et par conséquent la distribution en taille en sortie du procédé. Or, ce type de molécules est présent dans quasiment tous les procédés polyphasiques. L'étude des effets des tensioactifs dans ces procédés s'est alors imposée. Dans un des plus récents modèles, les bulles ou gouttes sont considérées comme des oscillateurs forcés par la turbulence de l'écoulement environnant. Il est alors nécessaire de connaître à la fois la turbulence dans le voisinage de la goutte et les propriétés dynamique de la goutte. La première peut être déterminée expérimentalement. La réponse de la goutte au forçage est alors décrite comme une somme d'harmoniques sphériques dont la dynamique est décrite pour chaque mode par une pulsation et un coefficient d'amortissement. Cette thèse aborde l’étude des effets des tensioactifs sur ces deux grandeurs. Elle s’est déroulée en collaboration entre l'IMFT et le LGC, ce qui a permis d'associer les compétences de chaque laboratoire dans les domaines de la physico-chimie, de l'hydrodynamique des phases dispersées et des écoulements turbulents diphasiques. Le projet lors de cette thèse est d'étudier numériquement les effets des tensioactifs sur les échelles temporelles caractéristiques des oscillations, dans le cas où la goutte est immobile ou bien en mouvement dans un fluide externe. Une équation de transport des tensioactifs ainsi que l'effet Marangoni à l'interface ont été modelisés dans le code DIVA, et validés à l'aide de cas tests. Ensuite, des simulations de gouttes subissant des oscillations de forme suivant le mode 2 des harmoniques sphériques ont permis de décrire les effets des tensioactifs sur la dynamique des interfaces. Ils ont été validés par la théorie pour des oscillations linéaires. Le couplage entre le mouvement d'ascension et les oscillations de formes a aussi été étudié, afin de comprendre l'effet d'un fort effet Marangoni, généré par l'ascension de la goutte, sur les oscillations. Les viscosités de surface peuvent aussi influencer radicalement la dynamique interfaciale. Lors de cette thèse, une méthode a été développée et validée pour permettre à l'outil de simulation de prendre en compte des viscosités de surface en se basant sur le modèle de Boussinesq-Scriven. Leur effet sur la dynamique des oscillations de forme a été étudié.
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Corlier-Bagdasaryan, Juliana. "Voluntary control of neural oscillations in the human brain." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066626/document.

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Introduction. Les animaux et les humains sont capables de moduler leur propre activité cérébrale, pourvu que leur soit donné un retour sensoriel en temps-réel de celle-ci. La gamme des activités contrôlables s’étend des rythmes oscillatoires, à la réponse hémodynamique , au taux de décharge des neurones ou même au signal calcique associé aux potentiels d’action. Le contrôle volontaire des activités neuronales, facilité par le plan expérimental d’un paradigme en boucle fermée, est au cœur de l’interaction corps-esprit et peut être utilisé pour adresser des questions philosophiques. Mais comme de nombreuses études l’ont démontré, les interfaces homme-machine sont aussi un outil puissant dans la réhabilitation motrice, la gestion de la douleur, la régulation des émotions, ou encore l’amélioration de la mémoire. Étant donné que la plupart des études a été conduite sur les sujets humains avec des techniques non-invasives, les mécanismes neurophysiologiques de l’autorégulation neuronale sont restés mal connus. L’objectif principal de ce travail était donc d’élaborer une description des principes physiologiques sous-tendant cette technique.Objectifs. D’après la théorie des oscillations neuronales à des multiples niveaux, la présente enquête était principalement définie par les questions suivantes : 1) Quels sont les marqueurs physiologiques du contrôle volontaire des activités neuronales? 2) Existe t-il des échelles spatiotemporelle plus facilement modulables que d’autres? 3) Les effets de l’entrainement sont –ils spécifiques ou généralisables en espace et fréquence ? et 4) Quelles sont les stratégies cognitives efficace pour contrôler les activités oscillatoires parmi plusieurs sujets ? Pour adresser ces questions, dans mon travail j’ai utilisé les enregistrements intracérébraux avec des macro- et micro-électrodes chez les patients épileptiques dans le cadre d’un bilan pré-chirurgical
Introduction. Animals and humans are capable to modulate their own brain activity if they are provided with real-time sensory feedback thereof. The range of controllable neural activities reaches from oscillatory brain rhythms, over hemodynamic response function to the firing of single neurons or even action-potential associated calcium signals. The voluntary control of neural activity facilitated by this ‘closed-loop’ experimental paradigm is at the very heart of the mind-body interaction and can be used to address philosophical questions. But as numerous successful applications of neurofeedback and brain-computer interfaces have demonstrated, it is also a powerful tool in motor rehabilitation, pain management, emotion regulation or memory improvement. Because most previous studies were conducted on humans using non-invasive recordings techniques, the neurophysiological mechanisms of neural self-regulation remained obscure. The main objective of the present work was thus to provide a better understanding of its underlying principles. Objectives. Following a multiscale theoretical framework of neural oscillations, the present investigation was largely guided by the following questions: 1) What are the physiological markers of successful control? 2) Are some regions or spatiotemporal scales more easily controllable than others? 3) Are training effects specific or generalized? and 4) What are subject-invariant successful cognitive strategies of neural self-control? To address these questions, we took advantage of intracerebral macro- and micro-electrode recordings in epileptic patients undergoing long-term monitoring in the presurgical context
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Pigny, Sylvain. "Oscillations d'une interface fluide en présence d'effets MHD : application aux cuves à aluminium." Grenoble INPG, 1990. https://hal.archives-ouvertes.fr/tel-01340687.

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La statilite d'une interface traversee par un courant electrique; entre deux fluides non miscibles, de densites differentes, plonges dans un champ magnetique, est etudiee premierement par une approche perturbatoire. Les deux fluides sont pris en sadwich entre deux electrodes. Les quatre milieux, d'epaisseur et de conductivite electriques finies, sont consideres comme infinis dans les directions horizontales. L'importance des non uniformites des courants et champs magnetiques est mise en evidence, ainsi que des grandes echelles du phenomene. En second lieu, un modele numerique, puis une experience de laboratoire, ou les forces electromagnetiques sont remplacees par une excitation mecanique, permettent l'etude des oscillations d'interface dans le cas particulier des cuves a aluminium
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Hoffmann, Loren C. "Cerebellar theta oscillations are synchronized during hippocampal theta-contingent trace conditioning." Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1251998588.

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De, Boutaud De Lavilléon Gaetan. "De la corrélation à la causalité : apports des interfaces cerveaux-machines sur l'étude des réactivations des cellules de lieu et des oscillations lentes du sommeil." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066708.

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La mémoire spatiale est composée d'une phase d''encodage pendant l'éveil, suivi par une phase de consolidation pendant le sommeil, au cours de laquelle les séquences d'activation des cellules de lieu sont rejouées. Ces réactivations ont lieu pendant des oscillations à hautes fréquences du sommeil à ondes lentes, appelées les sharp-wave ripples (SPW-Rs) dont l'occurrence est coordonnées avec celle des autres rythmes corticaux (ondes delta 2-4Hz et spindles 10-15Hz). Ce modèle bien que largement accepté ne repose que sur des études corrélatives. De plus, les SWP-Rs et les ondes delta sont impliquées à la fois dans l'homéostasie du sommeil et dans la consolidation de la mémoire. Or l'interaction entre les deux phénomènes n'a jamais été caractérisée. Au moyen d'une interface cerveau machine, nous avons associé les réactivations spontanées d'une cellule de lieu pendant le sommeil à une stimulation électrique de récompense. Au réveil les souris allaient dans le champ de lieu du neurone démontrant la possibilité de créer des souvenirs artificiels pendant le sommeil. Ceci démontrait également le rôle causal des cellules de lieu dans la navigation spatiale ainsi que l'existence de réactivations d'informations spatiales pendant le sommeil. Dans un second temps, nous avons développé une deuxième interface cerveau-machine permettant de manipuler les ondes delta. Nous avons également montré que l'occurrence des SPW-Rs et des ondes delta diminuent avec le temps de sommeil en maintenant leur coordination. Enfin nous avons identifié une sous-population de neurones corticaux potentiellement impliquée dans la génération des ondes delta et leur régulation par la pression homéostatique de sommeil
Spatial memory is composed of an encoding phase during wakefulness, followed by a consolidation phase during sleep, corresponding to the replay of sequences of activation of hippocampal place cells observed during wake. Those reactivations occur during slow wave sleep, mostly during hippocampal high frequency oscillations, called sharp-wave ripples (SPW-Rs). Moreover, SPW-Rs occurrence is coordinated with others cortical rhythms (delta waves 2-4Hz and spindles 10-15Hz). Although this theoretical framework is widely accepted, it is only based on correlative studies. Moreover, in addition to memory consolidation, SPW-Rs and delta waves are also involved in sleep homeostasis. Finally, a fine description of the interactions between the two phenomena is still lacking. By using a newly designed brain machine interface, we associated spontaneous reactivations of a single place cell during sleep to intracranial rewarding stimulations. At awakening, mice went and stayed within the place field of the related neuron, demonstrating the possibility to create artificial memories during sleep. It also demonstrated the causal role of place cells on spatial navigation, and that they still convey spatial information during sleep supporting the existence of sleep reactivation. We also developed a second brain machine interface in order to manipulate delta waves during sleep. We showed that the occurrence of both SPW-Rs and delta waves decrease during sleep, even though their coordination was maintained. Finally, we identify a sub-population of cortical neurons potentially involved both in the generation of delta waves and their modulation by the homeostatic pressure of sleep
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Hund-Huart, Muriel. "Etude des transferts interfaciaux en extraction liquide-liquide sous champ électrique." Paris, ENMP, 1988. http://tel.archives-ouvertes.fr/tel-00845221.

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L'étude expérimentale du transfert de matière est réalisée pour 3 systèmes ternaires mettant en jeu principalement des molécules plutôt que des ions. Deux phénomènes sont observés: un effet électrostatique (orientation des molécules) et un effet électrodynamique (modification de la tension interfaciale). Un contacteur à électrode externe, soumis à des oscillations forcées est utilisé pour l'extraction de l'acide acétique. Lorsque la fréquence des oscillations est égale à la fréquence de résonance naturelle des gouttes on observe une diminution de la vitesse de chute et une augmentation du coefficient de transfert. La taille des gouttes a aussi une influence.
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Yang, Ming. "High magnetic field studies of 2DEG in graphene on SiC and at the LaAlO³/SrTiO³ interface." Thesis, Toulouse, INSA, 2018. http://www.theses.fr/2018ISAT0015/document.

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Cette thèse est dédiée à l'étude des propriétés de magnéto-transport des gaz d'électrons bidimensionnel, et plus spécifiquement du graphène sur carbure de silicium (G/SiC) ainsi qu’à l'interface entre les oxydes complexes LaAlO3 (LAO) et SrTiO3 (STO). Nous exploitons la génération d’un champ magnétique intense (jusqu'à 80 T) et les très basses températures (jusqu'à 40 mK) pour étudier les propriétés de transport quantique, qui sont évocatrices de la structure de bandes électroniques sous-jacente. Dans G/SiC, à la limite du régime d’effet Hall quantique, nous mesurons un plateau de Hall ultra-large quantifié à R=h/2e² couvrant un champ magnétique de plus de 70 T (de 7 T à 80 T). La résistance longitudinale est proche de zéro mais présente, de manière inattendue, de faibles oscillations périodiques avec l’inverse du champ magnétique. Sur la base d’observations microscopiques, ce gaz d’électrons 2D est modélisé par une matrice de graphène ayant une densité de porteurs de charge faible, parsemée d’ilots de taille micrométrique ayant un dopage plus important. Les simulations numériques des propriétés de transport reproduisent bien le plateau de Hall et la présence des oscillations. Au-delà du substrat de SiC qui agit comme un réservoir de charge et stabilise le facteur de remplissage à ν=2, un transfert de charge dépendant du champ magnétique entre les ilots chargés est responsable de la présence des oscillations de la magnétorésistance. Cette étude originale fournit de nouvelles perspectives pour des applications en métrologie. Les propriétés remarquables des gaz d’électrons 2D à l'interface entre les oxydes complexes LAO et STO sont aujourd'hui envisagées pour le développement de futurs dispositifs multifonctionnels. Toutefois, leurs propriétés électroniques sont encore mal connues et nécessitent des recherches plus approfondies. Dans ces systèmes, la magnétorésistance montre des oscillations de Shubnikov-de Haas (SdH) quasi-périodiques et un effet Hall linéaire jusqu'à 55 T à basse température. Nous observons une différence d’un ordre de grandeur entre la densité de porteurs extraite de la période des oscillations SdH et la pente de la résistance de Hall, impliquant la présence de nombreuses sous-bandes à l'énergie de Fermi. Les oscillations quasi-périodiques de la magnétorésistance sont bien reproduites par des simulations numériques prenant en compte l'effet Rashba à l'interface. De plus, à partir de l'évolution des oscillations SdH avec la tension de grille à très basse température (40mK), nous identifions les sous-bandes électroniques contribuant au transport, les orbitales atomiques dont elles dérivent, ainsi que leur localisation spatiale dans la profondeur de l'interface
This thesis is devoted to the study of the magneto-transport properties of two dimensional electron gas (2DEG), and more specifically graphene on silicon carbide (G/SiC) as well as the interface between two complex oxides LaAlO3 / SrTiO3 (LAO/STO). We take advantage of very high magnetic field (up to 80 T) and very low temperature (down to 40 mK) to investigate the quantum transport properties, which are evocative of the underlying electronic band-structure. In G/SiC, close to the quantum Hall breakdown regime, we measure an ultra-broad quantum Hall plateau at R=h/2e² covering a magnetic field range of more than 70 T (from 7 T to 80 T). Accordingly, the longitudinal resistance is close to zero, but displays unexpected weak 1/B-periodic oscillations. Based on microscopic observations, this 2DEG is modeled as a low charge carrier density graphene matrix decorated by micrometers-size puddles with larger doping. Numerical simulations of the transport properties reproduce well both the broad Quantum Hall plateau and the presence of the oscillations. Besides the SiC substrate which acts as a charge reservoir and stabilizes the quantum Hall state at filling factor ν=2, a magnetic field dependent transfer of charges involving the puddles is responsible for the presence of the oscillating features. This original study provides new insights for resistance metrology purposes. The 2DEG arising at the interface between the complex oxides LAO and STO is nowadays envisioned for future multi-functional devices. Their electronic properties are still a matter of debate and require further investigations. The high field magneto-resistance of this 2DEG displays quasi-periodic Shubnikov-de Haas Oscillations (SdHO) and a linear Hall effect up to 55 T at low temperature. We observe a large discrepancy between the carrier density extracted from the period of the SdHO and the slope of the Hall resistance, which constitutes a strong evidence for the presence of many sub-bands crossing the Fermi energy. The quasi-periodic oscillations of the magneto-resistance are well reproduced by numerical simulations taking into account the strong Rashba effect at the interface. In addition, from the back-gate voltage evolution of the SdHO at sub-kelvin temperature, we identify the electronic sub-bands contributing to transport, the orbital symmetry from which they derive, as well as their spatial localization along the interface
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Hoffmann, Loren C. "Interactions between hippocampal and cerebellar theta oscillations during cerebellar theta-contingent trace eyeblink conditioning acquisition and extinction in the rabbit." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1397834474.

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Books on the topic "Interface oscillations"

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V, Birikh R., ed. Liquid interfacial systems: Oscillations and instability. New York: Marcel Dekker, 2003.

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Coward, Adrian V. Stability of oscillatory two phase Couette flow. Hampton, Va: Institute for Computer Applications in Science and Engineering, 1993.

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Velarde, Manuel G., Jean Claude Legros, Rudolph V. Birikh, and Vladimir A. Briskman. Liquid Interfacial Systems: Oscillations and Instability. Taylor & Francis Group, 2003.

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Velarde, Manuel G., Jean Claude Legros, Rudolph V. Birikh, and Vladimir A. Briskman. Liquid Interfacial Systems: Oscillations and Instability. Taylor & Francis Group, 2003.

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Velarde, Manuel G., Jean-Claude Legros, Rudolph V. Birikh, and Vladimir A. Briskman. Liquid Interfacial Systems: Oscillations and Instability. Taylor & Francis Group, 2003.

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Velarde, Manuel G., Jean Claude Legros, Rudolph V. Birikh, and Vladimir A. Briskman. Liquid Interfacial Systems: Oscillations and Instability. Taylor & Francis Group, 2003.

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Velarde, Manuel G., Jean Claude Legros, Rudolph V. Birikh, and Vladimir A. Briskman. Liquid Interfacial Systems: Oscillations and Instability. Taylor & Francis Group, 2003.

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T. Wave Phenomena. Courier Dover Publications, 2014.

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Book chapters on the topic "Interface oscillations"

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Chabal, Y. J., S. B. Christman, V. A. Burrows, N. A. Collins, and S. Sundaresan. "Self-sustained Kinetic Oscillations in the Catalytic CO Oxidation on Platinum." In Kinetics of Interface Reactions, 285–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-72675-0_24.

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Shabala, S. "Physiological implications of ultradian oscillations in plant roots." In Roots: The Dynamic Interface between Plants and the Earth, 217–26. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2923-9_21.

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Seitz, Timo, Ansgar Lechtenberg, and Peter Gerlinger. "Rocket Combustion Chamber Simulations Using High-Order Methods." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 381–94. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_24.

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Abstract High-order spatial discretizations significantly improve the accuracy of flow simulations. In this work, a multi-dimensional limiting process with low diffusion (MLP$$^\text {ld}$$) and up to fifth order accuracy is employed. The advantage of MLP is that all surrounding volumes of a specific volume may be used to obtain cell interface values. This prevents oscillations at oblique discontinuities and improves convergence. This numerical scheme is utilized to investigate three different rocket combustors, namely a seven injector methane/oxygen combustion chamber, the widely simulated PennState preburner combustor and a single injector chamber called BKC, where pressure oscillations are important.
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Dobson, P. J., B. A. Joyce, J. H. Neave, and J. Zhang. "Intensity Oscillations in Reflection High Energy Electron Diffraction during Epitaxial Growth." In Surface and Interface Characterization by Electron Optical Methods, 185–93. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-9537-3_11.

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Wen, Chih-Yung, Yazhong Jiang, and Lisong Shi. "CESE Schemes with Numerical Dissipation." In Engineering Applications of Computational Methods, 21–36. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0876-9_3.

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AbstractAs depicted in Chap. 2, the interface between the two sub-CEs (CD in Fig. 2.7), belongs to the SE of (j, n). The flux FC needs to be calculated through the Taylor expansion at point (j, n) toward the inverse time direction. As a result, the a scheme is reversible. This violates the second law of thermodynamics. Thus, the non-dissipative core suffers from the unphysical oscillations for practical applications.
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Schmal, Christoph, Gregor Mönke, and Adrián E. Granada. "Analysis of Complex Circadian Time Series Data Using Wavelets." In Methods in Molecular Biology, 35–54. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2249-0_3.

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AbstractExperiments that compare rhythmic properties across different genetic alterations and entrainment conditions underlie some of the most important breakthroughs in circadian biology. A robust estimation of the rhythmic properties of the circadian signals goes hand in hand with these discoveries. Widely applied traditional signal analysis methods such as fitting cosine functions or Fourier transformations rely on the assumption that oscillation periods do not change over time. However, novel high-resolution recording techniques have shown that, most commonly, circadian signals exhibit time-dependent changes of periods and amplitudes which cannot be captured with the traditional approaches. In this chapter we introduce a method to determine time-dependent properties of oscillatory signals, using the novel open-source Python-based Biological Oscillations Analysis Toolkit (pyBOAT). We show with examples how to detect rhythms, compute and interpret high-resolution time-dependent spectral results, analyze the main oscillatory component, and to subsequently determine these main components’ time-dependent instantaneous period, amplitude, and phase. We introduce step-by-step how such an analysis can be done by means of the easy-to-use point-and-click graphical user interface (GUI) provided by pyBOAT or executed within a Python programming environment. Concepts are explained using simulated signals as well as experimentally obtained time series.
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Traub, Roger D., Mark O. Cunningham, and Miles A. Whittington. "What Is a Seizure Network? Very Fast Oscillations at the Interface Between Normal and Epileptic Brain." In Issues in Clinical Epileptology: A View from the Bench, 71–80. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8914-1_6.

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Soldani, M., and O. Faggioni. "A Tool to Aid the Navigation in La Spezia Harbour (Italy)." In Geomatics for Green and Digital Transition, 89–101. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-17439-1_6.

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AbstractThe knowledge of sea level in harbours is very important to manage port activities (safety of navigation, prevention of ship stranding, optimization of vessel loading, water quality control). In this article we describe the use of a software tool developed to help local authorities and working organizations to optimize navigation and avoid or manage hazardous situations due to sea level changes in port basins. This prototype application, starting from reading data coming from a monitoring station in La Spezia harbour (in North Western Italy), updates dynamically the port bathymetry based on sea level oscillations (measured in the past or real-time, or expected in the near future). Then, it detects potentially dangerous areas for a given ship moving in the basin at a certain time, by means of the idea of “virtual traffic lights”: sea level variations are provided as parameters to the application that performs the updating of the bathymetric map and the subdivision of the harbour in allowed (green)/warning (yellow)/prohibited (red) areas for each ship, based on its draft. The tool can provide a useful support interface to competent authorities to avoid or manage critical situations by detecting hazardous areas for a given vessel at a given time.
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Pfurtscheller, Gert, and Christa Neuper. "Dynamics of Sensorimotor Oscillations in a Motor Task." In Brain-Computer Interfaces, 47–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02091-9_3.

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Muhmood, Luckman, Nurni N. Viswanathan, and Seshadri Seetharaman. "Modelling and Experimental Studies of Diffusivity of Sulfur and its Relevance in Observing Surface Oscillations at the Slag Metal Interface through X-Ray Imaging." In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 581–87. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_62.

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Conference papers on the topic "Interface oscillations"

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Kuzma-Kichta, Yury A., Alexander Konstantinovich Ustinov, and Alexander Alexandrovich Ustinov. "Analysis of interface oscillations during boiling." In International Heat Transfer Conference 12. Connecticut: Begellhouse, 2002. http://dx.doi.org/10.1615/ihtc12.2340.

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Terashima, Hiroshi, Soshi Kawai, and Mitsuo Koshi. "Approach to Prevent Spurious Oscillations in Compressible Multicomponent Flows Using High-Order Methods." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72246.

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We present an interface-capturing method for fluid interfaces in compressible multicomponent flows using high-order central-difference-based schemes. Numerical diffusion terms are consistently designed so that the velocity, pressure, and temperature equilibriums are maintained at the fluid interfaces, while serving as an efficient interface-capturing. Advection problems of a contact discontinuity and a material interface shows that 1) the present method maintains the velocity, pressure, and temperature equilibriums at the fluid interfaces (oscillation-free property) and 2) the numerical diffusion terms effectively works for suppressing spurious wiggles of the density or temperature. Comparisons with a conventional fully-conservative approach demonstrates the superiority of the present method in avoiding spurious oscillations. A shock tube problem of two-component gases shows the capability for capturing the shock wave while the velocity and pressure equilibriums are successfully maintained at the contact discontinuity.
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Nagarajan, Srikantan S. "Advances in Imaging of Neural Oscillations." In 2023 11th International Winter Conference on Brain-Computer Interface (BCI). IEEE, 2023. http://dx.doi.org/10.1109/bci57258.2023.10078491.

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Haas, F., P. K. Shukla, Bengt Eliasson, and Padma K. Shukla. "Nonlinear electrostatic oscillations in a sharp plasma interface." In NEW DEVELOPMENTS IN NONLINEAR PLASMA PHYSICS: Proceedings of the 2009 ICTP Summer College on Plasma Physics and International Symposium on Cutting Edge Plasma Physics. AIP, 2009. http://dx.doi.org/10.1063/1.3266807.

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Nigmatulin, Bulat I., A. S. Moloshnikov, D. V. Sidenkov, Yury A. Kuzma-Kichta, Alexander Konstantinovich Ustinov, and V. S. Rykhlik. "INTERFACE OSCILLATIONS AND HEAT TRANSFER MECHANISM AT FILM BOILING." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.4680.

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Bernitsas, Michael M., James Ofuegbe, Jau-Uei Chen, and Hai Sun. "Eigen-Solution for Flow Induced Oscillations (VIV and Galloping) Revealed at the Fluid-Structure Interface." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96823.

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Abstract Consistent rather than heuristic nondimensionalization of the fluid and oscillator dynamics in fluid-structure interaction, leads to decoupling of amplitude from frequency response. Further, recognizing that the number of governing dimensionless parameters should decrease, rather than increase, due to the fluid-structure synergy at the interface, an eigen-relation is revealed for a cylinder in Flow Induced Oscillations (FIO), including VIV and galloping: mA/mbod = CA/m* = 1/f*2-1. It shows that, for a given dimensionless oscillation frequency f*, the ratio of real added-mass to oscillating-mass is fully defined. Amplitude decoupling and the eigen-relation, lead to explicit expressions for coefficients, phases, and magnitudes of total, added-mass, and in-phase-with-velocity forces; revealing their dependence on the generic Strouhal number (Stn = fn*), damping, and Reynolds. Heuristic dimensionless parameters, (mass-damping, reduced velocity, mass-ratio, force coefficients) used in VIV data presentation are not needed. Theoretical derivations and force reconstruction match nearly perfectly with extensive experimental data collected over a decade in the Marine Renewable Energy Laboratory (MRELab) at the University of Michigan using four different oscillator test-models. Beyond the single frequency response model, the residuary force is derived by comparison to experiments. Established facts regarding VIV and galloping and new important observations are readily explained: (1) The effects of Strouhal, damping-ratio, mass-ratio, Reynolds, reduced velocity, and stagnation pressure. (2) The cause of expansion/contraction of the VIV range of synchronization. (3) The corresponding slope-change in oscillation frequency with respect to the Strouhal frequency of a stationary-cylinder. (4) The critical mass-ratio m* implying perpetual VIV. (5) The significance of the natural frequency of the oscillator in vacuo. (6) The effect of vortices on VIV and galloping. (7) The magnitude of vortex forces. (8) The indirect and direct vortex effects. (9) The unification of VIV and galloping onset. (10) Defining the next step in higher order theories for VIV and galloping beyond the eigen-relation.
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Szalowski, Artur, and Dorel Picovici. "Investigating colour’s effect in stimulating brain oscillations for BCI systems." In 2016 4th International Winter Conference on Brain-Computer Interface (BCI). IEEE, 2016. http://dx.doi.org/10.1109/iww-bci.2016.7457449.

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Mo, Dongchuan, Guansheng Zou, Shushen Lu, and L. Winston Zhang. "A Flow Visualization Study on the Temperature Oscillations Inside a Loop Heat Pipe With Flat Evaporator." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73185.

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This paper presents a flow visualization study on the temperature oscillations inside a loop heat pipe in order to gain a better understanding of its heat transfer characteristics. A flat loop heat pipe (FLHP) with a flat evaporator instead of a typical cylindrical evaporator was built using copper as the shell and water as the working fluid. An experimental setup was designed by using the transparent material instead of copper in some parts of the FLHP. The experiment results showed that there were at least three different flow patterns in the vapor line as the heating power increased. The temperatures in different locations of the loop oscillated even when the heating power was kept constant. The largest amplitude of the temperature oscillation in the loop was located at the condenser outlet. It was found that the temperature oscillation at the condenser outlet could be divided into two types, one with smaller amplitudes and the other with larger amplitudes. The smaller amplitude temperature oscillations were always there when the heating power was increased step by step, while the larger amplitude temperature oscillations would disappear initially and show up later. Finally, the location of the vapor/liquid interface inside the condenser varied with the temperature oscillations, resulting in liquid/vapor interface motion in the compensation chamber.
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Kalafatovich, Jenifer, and Minji Lee. "Neural Oscillations for Encoding and Decoding Declarative Memory using EEG Signals." In 2020 8th International Winter Conference on Brain-Computer Interface (BCI). IEEE, 2020. http://dx.doi.org/10.1109/bci48061.2020.9061650.

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Khanna, Preeya, Kelvin So, and Jose M. Carmena. "Volitional phase control of neural oscillations using a brain-machine interface." In 2013 6th International IEEE/EMBS Conference on Neural Engineering (NER). IEEE, 2013. http://dx.doi.org/10.1109/ner.2013.6696123.

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Reports on the topic "Interface oscillations"

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Poler, J. C., K. K. McKay, and E. A. Irene. Characterization of the Si/SiO2 Interfere Morphology from Quantum Oscillations in Fowler-Nordheim Tunneling Currents. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada265149.

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