Relevant bibliographies by topics / Transverse velocity

Contents

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

Academic literature on the topic 'Transverse velocity'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Transverse velocity"

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Jensen, Jørgen. "Transverse spectral velocity estimation." IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 61, no. 11 (November 2014): 1815–23. http://dx.doi.org/10.1109/tuffc.2014.006488.

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Andreu-Angulo, Ignacio, Holger Babinsky, Hülya Biler, Girguis Sedky, and Anya R. Jones. "Effect of Transverse Gust Velocity Profiles." AIAA Journal 58, no. 12 (December 2020): 5123–33. http://dx.doi.org/10.2514/1.j059665.

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Wang, Hao, Jie Mao, Ke Liu, Sheng Wang, and Liang Yu. "Transverse Velocity Effect on Hunt’s Flow." IEEE Transactions on Plasma Science 46, no. 5 (May 2018): 1534–38. http://dx.doi.org/10.1109/tps.2017.2777844.

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De Colle, Fabio, Adriano H. Cerqueira, and Angels Riera. "TRANSVERSE VELOCITY SHIFTS IN PROTOSTELLAR JETS: ROTATION OR VELOCITY ASYMMETRIES?" Astrophysical Journal 832, no. 2 (November 29, 2016): 152. http://dx.doi.org/10.3847/0004-637x/832/2/152.

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Lin, Hong, Chang Li Zhou, Jun Shi, and Zhi Hua Feng. "Transverse Vibration of Axially Accelerating Moving Fabric: Experiment and Analysis." Applied Mechanics and Materials 226-228 (November 2012): 150–53. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.150.

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Axially moving fabric can be met in many textile devices. In most cases, the transverse vibrations of fabric can cause a series of negative influents to the product. In this paper, the transverse vibration of axially accelerating moving fabric, which is excited by velocity fluctuations, is investigated by experimental method. The harmonic varying velocity is achieved through a brushless DC motor controlled by PWM technology based on the embedded microcontroller LPC1768. An inductive non-contact displacement sensor is used to measure transversal vibration of fabric. The motor speed is measured by a photoelectric encoder. The experimental data is processed by measurement platform based on Labview and the analysis is given. Laboratory measurements demonstrate the effect of velocity fluctuations on transverse vibration of fabric, particularly near the parametric resonance region.
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Itoh, Naoki, and Takemi Kotouda. "Velocity-Magnetic Field Correlation of Pulsars." International Astronomical Union Colloquium 160 (1996): 49–50. http://dx.doi.org/10.1017/s0252921100040999.

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Monte Carlo simulations of the evolution of pulsars are carried out in order to compare with the recent measurement of the pulsar transverse velocity by Lyne & Lorimer (1994). The new electron density distribution model of Taylor & Cordes (1993) is adopted in the simulation. Accurate pulsar orbits in the Galactic gravitational field are calculated. It is found that the constant magnetic field model of pulsars can account for the new measurement of the pulsar transverse velocity and the apparent correlation between the strength of the magnetic field and the transverse velocity of the pulsars. The present finding confirms the validity of the constant magnetic field model of pulsars and consolidates the idea that the apparent correlation between the strength of the magnetic field and the transverse velocity of the pulsars is caused by observational selection effects.
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Ristić, D., Mile Ivanda, K. Furić, M. Montagna, Maurizio Ferrari, A. Chiasera, and Yoann Jestin. "Raman Scattering on the l=2 Spheroidal Mode of Spherical Nanoparticles." Advances in Science and Technology 55 (September 2008): 132–37. http://dx.doi.org/10.4028/www.scientific.net/ast.55.132.

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The Raman light to vibrations coupling coefficients C(ν) of quadrupolar and symmetrical vibrational modes of spherical nanoparticles embedded in a matrix are calculated. In contrast to the symmetrical mode, the C(ν) of the quadrupolar modes consists of the longitudinal and transversal sound velocity contributions. It is shown, that depending on the ratio of longitudinal and transverse sound velocity, these two contributions can interfere constructively or destructively resulting in enhancing or vanishing of some radial modes. Different peaks in the C(ν) spectrum were attributed to transverse and longitudinal spheroidal modes and the longitudinal spheroidal modes were found to have a higher Raman intensity than the transverse modes. The theoretical model was tested on a sample of HfO2 nanoparticles in a silica matrix.
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Cohen, Jack K. "Analytic study of the effective parameters for determination of the NMO velocity function in transversely isotropic media." GEOPHYSICS 62, no. 6 (November 1997): 1855–66. http://dx.doi.org/10.1190/1.1444286.

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In their studies of transversely isotropic media with a vertical symmetry axis (VTI media), Alkhalifah and Tsvankin observed that, to a high numerical accuracy, the normal moveout (NMO) velocity for dipping reflectors as a function of ray parameter p depends mainly on just two parameters, each of which can be determined from surface P‐wave observations. They substantiated this result by using the weak‐anisotropy approximation and exploited it to develop a time‐domain processing sequence that takes into account vertical transverse isotropy. In this study, the two‐parameter Alkhalifah‐Tsvankin result was further examined analytically. It was found that although there is (as these authors already observed) some dependence on the remaining parameters of the problem, this dependence is weak, especially in the practically important regimes of weak to moderately strong transverse isotropy and small ray parameter. In each of these regimes, an analytic solution is derived for the anisotropy parameter η required for time‐domain P‐wave imaging in VTI media. In the case of elliptical anisotropy (η = 0), NMO velocity expressed through p is fully controlled just by the zero‐dip NMO velocity—one of the Alkhalifah‐ Tsvankin parameters. The two‐parameter representation of NMO velocity also was shown to be exact in another limit—that of the zero shear‐wave vertical velociy. The analytic results derived here are based on new representations for both the P‐wave phase velocity and normal moveout velocity in terms of the ray parameter, with explicit expressions given for the cases of vanishing onaxis shear speed, weak to moderate transverse isotropy, and small to moderate ray parameter. Using these formulas, I have rederived and, in some cases, extended in a uniform manner various results of Tsvankin, Alkhalifah, and others. Examples include second‐order expansions in the anisotropy parameters for both the P‐wave phase‐velocity function and NMO‐velocity function, as well as expansions in powers of the ray parameter for both of these functions. I have checked these expansions against the corresponding exact functions for several choices of the anisotropy parameters.
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Yan, Ting-Zhi, and Shan Li. "Transverse radius dependence for transverse velocity and elliptic flow in intermediate energy HIC." Chinese Physics C 35, no. 5 (May 2011): 459–62. http://dx.doi.org/10.1088/1674-1137/35/5/010.

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Amarante, João A. S., Martin C. Smith, and Corrado Boeche. "The high transverse velocity stars in Gaia-LAMOST." Proceedings of the International Astronomical Union 14, S353 (June 2019): 59–60. http://dx.doi.org/10.1017/s1743921319008603.

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AbstractAlthough the stellar halo accounts for just ∼1% of the total stellar mass of the Milky Way, the kinematics of halo stars can tell us a lot about the origins and evolution of our Galaxy. It has been shown that the high transverse velocity stars in Gaia DR2 reveal a double sequence in the Hertzsprung-Russell (HR) diagram, indicating a duality in the local halo within 1 kpc. We fit these stars by updating the popular Besançon/Galaxia model, incorporating the latest observational results for the stellar halo. We are able to obtain a good match to the Gaia data and provide new constraints on the properties of the disc and halo. In particular, we show that the thick disc contribution to this high velocity tail is small, but not negligible, and likely has an influence on the red sequence of the HR diagram.
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Dissertations / Theses on the topic "Transverse velocity"

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Sharil, Suraya. "Velocity field and transverse dispersion in vegetated flows." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/45955/.

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In recent years aquatic vegetation has become more accepted and important in the river restoration schemes and preserving river ecology. The purpose of this thesis is to investigate the influence of emergent vegetation on velocity and turbulence fields in order to have a better understanding of the effect of vegetation on the transverse mixing processes. To achieve this objective, a series of experiments was conducted in an open channel flume with emergent rigid rods in both staggered and aligned arrangements. Detailed velocity, turbulence and dye tracer measurement were carried out for six vegetation densities relating to solid volume fractions (SVF) in the range 0.51 % to 7.79 %. In sparse vegetation (SVF < 10 %) as expected the normalised spatially-averaged longitudinal velocity reduces as the vegetation density increases with approximately 30 % to 50 % reduction when the solid volume fraction is doubled. Results indicated that in sparse vegetation, the normalised turbulence intensities increased with increasing solid volume fraction. The bulk drag coefficient increased with increasing vegetation density whilst decreased with increasing stem Reynolds number. The transverse mixing coefficient increases with both increasing vegetation density and stem Reynolds number. The current study showed that for sparse vegetation (SVF < 10%), the transverse mixing coefficient has a stronger correlation with turbulence intensity compared to transverse shear. Therefore indicating that within sparse vegetated flows, turbulence dominates over transverse shear in transverse mixing. In addition to that, transverse mixing also correlate better with double-averaged turbulence intensity compared to turbulent kinetic energy. This reflects that the turbulence in the longitudinal direction plays a greater contribution to the overall transverse dispersion than the contribution of the total turbulence in all three directions. Finally two vegetation transverse dispersions models proposed by other researcher for randomly distributed vegetation were tested against data from the current study. Both models were found to predict reasonably well.
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Ainsworth, Kim. "Low velocity transverse impact of filament wound E-glass/epoxy resin pipes." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293699.

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Guedez, Andreina. "Developing Correlations for Velocity Models in Vertical Transverse Isotropic Media| Bakken Case Study." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10615682.

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The vertical and horizontal mechanical properties of a VTI medium can be obtained from five stiffness coefficients (C33, C44, C66, C13, and C12) using velocities at different angles and density measurements. However, when using well log data for vertical wells, only three out of the five elastic constants can be calculated. The sonic tool cannot measure C13 and C12; thus, different empirical models have been proposed to determine them, making assumptions that do not provide completely accurate results. In this paper, a new empirical model is introduced to obtain the stiffness coefficients. Datasets of dynamic core measurements of shales from different parts of the world are compiled and later, analyzed. The method was based on establishing correlations for the stiffness coefficients, both for each formation and for all formations put together. There were two sets of correlations—those with C 33 as the dependent variable, and those with C44 as the dependent variable. M-ANNIE assumptions were also obtained. Because Stoneley slowness is difficult to measure and can cause errors in the calculations, it was not used.

Finally, isotropic and VTI minimum horizontal stresses are calculated and compared using well log data from the Bakken formation. VTI minimum horizontal stress calculations used the M-ANNIE model and the correlations determined for the Bakken formation core data. Generally, the new model provides results similar to M-ANNIE predictions, and better results than the isotropic and ANNIE models. Although the proposed method produces results similar to those of the M-ANNIE model, which is widely used as a reference model throughout the industry, the proposed method is different in that it can be used under a different set of circumstances when some inputs are available, and others are not. This method reduces the underestimation of minimum horizontal stress made by the isotropic and ANNIE models as well.

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Ferenczi, Gergely. "Which-path problem for one and two particles with two degrees of freedom and a relation between transverse spatial structure and group velocity of light." Thesis, University of Glasgow, 2016. http://theses.gla.ac.uk/7475/.

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Quantum mechanics, optics and indeed any wave theory exhibits the phenomenon of interference. In this thesis we present two problems investigating interference due to indistinguishable alternatives and a mostly unrelated investigation into the free space propagation speed of light pulses in particular spatial modes. In chapter 1 we introduce the basic properties of the electromagnetic field needed for the subsequent chapters. In chapter 2 we review the properties of interference using the beam splitter and the Mach-Zehnder interferometer. In particular we review what happens when one of the paths of the interferometer is marked in some way so that the particle having traversed it contains information as to which path it went down (to be followed up in chapter 3) and we review Hong-Ou-Mandel interference at a beam splitter (to be followed up in chapter 5). In chapter 3 we present the first of the interference problems. This consists of a nested Mach-Zehnder interferometer in which each of the free space propagation segments are weakly marked by mirrors vibrating at different frequencies [1]. The original experiment drew the conclusions that the photons followed disconnected paths. We partition the description of the light in the interferometer according to the number of paths it contains which-way information about and reinterpret the results reported in [1] in terms of the interference of paths spatially connected from source to detector. In chapter 4 we briefly review optical angular momentum, entanglement and spontaneous parametric down conversion. These concepts feed into chapter 5 in which we present the second of the interference problems namely Hong-Ou-Mandel interference with particles possessing two degrees of freedom. We analyse the problem in terms of exchange symmetry for both boson and fermion pairs and show that the particle statistics at a beam splitter can be controlled for suitably chosen states. We propose an experimental test of these ideas using orbital angular momentum entangled photons. In chapter 6 we look at the effect that the transverse spatial structure of the mode that a pulse of light is excited in has on its group velocity. We show that the resulting group velocity is slower than the speed of light in vacuum for plane waves and that this reduction in the group velocity is related to the spread in the wave vectors required to create the transverse spatial structure. We present experimental results of the measurement of this slowing down using Hong-Ou-Mandel interference.
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Kaynak, Mehmet. "Non-destructive Testing Of Columns Under Axial Compression Using Tranverse Vibration Technique, And Ultrasonic Approaches." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1260465/index.pdf.

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The level of axial compressive load on an existing column is one of the most important parameters to be known. This thesis aims to investigate current state of the art of NDT techniques, their application, and investigate alternative ways of using current technology to estimate the axial compressive load on columns. For this purpose, transverse vibration technique, ultrasonic pulse velocity method, and waveform and frequency content evaluation of ultrasound are investigated and implemented. Analytical and experimental studies on column transverse vibration frequency and axial load relationship are conducted and presented. The measured experimental lateral vibration frequency of the first bending mode decreased under increased axial compressive load as expected from analytical studies. Relationships between axial load and vibration frequency are derived and defined for different boundary conditions. Relationship charts are prepared for complicated solution sets. Numerical calculations, laboratory and field tests revealed that natural frequencies of slender columns are more sensitive to axial load changes. The available ultrasonic methods are investigated and described. Stress wave propagation in anisotropic solids is studied. Previous works have shown that the propogation velocity of stress waves depends on the density, Poisson&rsquo
s ratio, modulus of elasticity of the medium, and the state of stress. The orientation of the loading direction to the wave propogation direction, the couplant (ultrasonic transmission gel) uniformity, variability in the pressure applied to hold the transducers, alignment of the transmitting and recieving transducers, accuracy and modelling of Poisson&rsquo
s ratio make the ultrasonic testing more complicated.
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Chaabat, Fateh. "Control of fire smokes in road tunnels equipped with mechanical ventilation systems." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEC006.

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Lors d’un incendie en tunnel, la perte de visibilité due à la densité optique des fumées et leurs problèmes de toxicité sont considérés comme les risques principaux auxquels les usagers sont exposés. Pour cela, le contrôle de la fumée est souvent la partie la plus importante de la planification d’urgence. Les systèmes de ventilation sont l’une des principales mesures de protection à adopter pour empêcher la fumée de se répandre. Cependant, la propagation de la fumée est un phénomène très complexe et il est donc parfois difficile à contrôler. Cette complexité exige de meilleurs outils de sécurité pour améliorer l’efficacité des systèmes de ventilation et assurer ainsi la sécurité des personnes en cas d’incendie, ce qui constitue l’objectif principal de nos travaux de recherche. Dans cette thèse, l’étude des incendies dans les tunnels routiers équipés de systèmes de désenfumage longitudinaux et transversaux a été réalisée expérimentalement et numériquement. Les expériences ont été menées dans la maquette située au LMFA et les simulations numériques ont été réalisées en utilisant le code de calcul FDS (Fire Dynamics Simulator) avec l’approche de simulation des grandes échelles LES (Large Eddy Simulation). Le foyer est modélisé par le rejet d’un mélange d’air et d’hélium dans de d’air frais. Avec ce type de simulation d’incendie, les pertes de chaleur par rayonnement et par conduction à travers les parois du tunnel ne sont pas prises en compte, mais le modèle peut néanmoins fournir des informations sur la phénoménologie et les champs de données pouvant être comparés à des incendies réels. Dans une première partie, des mesures de champ de vitesse ont été effectuées à l’aide de la technique de vélocimétrie par images de particules PIV pour étudier la dynamique des rejets flottants dans des tunnels à ventilation longitudinale. L’objectif est d’évaluer les effets non Boussinesq (liés aux grandes différences de densité entre le rejet flottant et l’air ambiant) sur la dynamique des rejets "forcés" et "paresseux", dominés respectivement par le flux de quantité de mouvement et le flux de flottabilité. Ensuite, l'effet de barrières solides (connues sous le nom "d'écrans de cantonnement" et placées au plafond du tunnel) sur la propagation des fumées d’incendie dans des tunnels à ventilation longitudinale est étudié. Deux types d'obstacles ont été examinés: des "petites barrières", conçues pour être fixées le long du plafond du tunnel, et des "grandes barrières", conçues pour être mobiles et déployées uniquement en cas d’incendie. Pour ce dernier type, seulement une seule barrière est placée au plafond du tunnel. Les expériences ont été réalisées avec et sans les effets de blocage des véhicules, qui sont modélisés par des blocs cubiques de différentes tailles. Les résultats ont montré que les barrières peuvent contrôler efficacement la propagation des fumées, même à basses vitesses de ventilation. Le taux de réduction de la vitesse critique (définie comme la vitesse de ventilation minimale à partir de laquelle toutes les fumées sont repoussées en aval du feu, dans le même sens que le flux de ventilation) dépend du taux de blocage créé par les obstacles (barrières, blocs ou les deux) situés juste en amont de la source. Les pertes de charge induites par ces barriers ont été aussi évaluées. Les résultats finals ont montré que les grandes barrières sont plus efficaces que les petites barrières car elles réduisent considérablement la vitesse critique et induisent moins de perte de charge dans les tunnels encombrés. Dans une deuxième partie, à l'aide d'un système de ventilation transversale, les conditions de confinement des fumées entre deux trappes d’extraction situées de part et d'autre de la source sont étudiées. Les effets de la forme et de la position des trappes (y compris le cas particulier des trappes de pleine largeur) sur les performances du système de ventilation transversale ont été évalués. [...]
In this thesis, fires in road tunnels with longitudinal and transverse ventilation systems are investigated numerically and experimentally. The fire smoke is simulated as a buoyant plume obtained by injecting a mixture of air and helium into ambient air. With this simplified representation, the radiation and the heat losses at the walls are not taken into account, but the model can nevertheless provide relevant information on phenomenology and data fields that can be compared to real fires. The study aims to meet various objectives, in particular increasing the efficiency of the mechanical ventilation systems and improving the safety of tunnels users in the event of fires. In the first part, experiments are conducted to measure, using Particle Image Velocimetry (PIV) system, the velocity fields induced by turbulent buoyant plumes released within a longitudinally ventilated tunnel. The aim is to study the non-Boussinesq effects (i.e. effects related to large density differences between the buoyant plume and the ambient air) on the dynamics of the momentum-driven releases and buoyancy-driven releases. Then, the effect of solid barriers, placed at the tunnel ceiling, on the propagation of smoke in fire events within longitudinally ventilated tunnels is studied. Two types of barrier are considered: "small barriers" designed to be fixed in place and "large barriers" designed to be mobile in real tunnels. Experiments are carried out with and without vehicular blockage, which are modelled by blocks of different sizes and placed upstream of the source. It is found that the presence of barriers and/or blocks reduces the critical velocity, which is defined as the minimum ventilation velocity required to ensure that all the smoke remains downstream of the source, in the same direction as the ventilation flow. The reduction rate of the latter depends on the blocking rate created by the obstacles (barriers, blocks or both) located just upstream of the source. Subsequently, the effect of blockages on pressure losses inside the tunnel is investigated. It is shown that the large barriers are more effective than small ones because they reduce the critical velocity and induce less pressure losses in congested tunnels. In the second part, using a transverse ventilation system, the conditions of confinement of the smoke flow between two exhaust vents located on either side of a buoyant source are investigated. The effect of the shape and the position (with respect to the tunnel axis) of the dampers, including the specific case of full-width dampers, on the performance of the transverse ventilation system is evaluated. The extent of the backflow length beyond the extraction dampers, the confinement velocity and the stability of the smoke stratification are studied. Results show that the greater the proportion of the tunnel width the vent covers and the closer to the centre of the tunnel the vent is placed, the more efficient the ventilation system at confining the smoke to the extraction zone and ensuring the stability of the smoke stratification. The effect of solid barriers placed at the tunnel ceiling is also evaluated with transverse ventilation and it’s found that large barriers can improve the efficiency of vents that do not cover the full width of the tunnel, by reducing the confinement velocity and enhancing the stability of the smoke stratification. In the last part, numerical simulations of fires in a tunnel with longitudinal and transverse ventilation are carried out using Fire Dynamics Simulator (FDS) software and Large Eddy Simulation (LES) approach. Several physical simulations are numerically reproduced to complete the interpretation of the experimental results. A good agreement is usually reached between the experimental and the numerical results. [...]
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Salles, Sébastien. "Estimation du mouvement de la paroi carotidienne en imagerie ultrasonore par une approche de marquage ultrasonore." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0092/document.

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Ce travail de thèse est axé sur le domaine du traitement d’images biomédicales. L’objectif de notre étude est l’estimation des paramètres traduisant les propriétés mécaniques de l’artère carotide in vivo en imagerie échographique, dans une optique de détection précoce des pathologies cardiovasculaires. L’étude des comportements dynamiques de l’artère pour le dépistage précoce de l’athérosclérose constitue à ce jour une piste privilégiée. Cependant, malgré les avancées récentes, l’estimation du mouvement de la paroi carotidienne reste toujours difficile, notamment dans la direction longitudinale (direction parallèle au vaisseau). L’élaboration d’une méthode innovante permettant d’étudier le mouvement de la paroi carotidienne constitue la principale motivation de ce travail de thèse. Les trois contributions principales proposées dans ce travail sont i) le développement, la validation, et l’évaluation clinique d’une méthode originale d’estimation de mouvement 2D adaptée au mouvement de la paroi carotidienne, ii) la validation en simulation, et expérimentale de l’extension à la 3D de la méthode d’estimation proposée, et iii) l’évaluation expérimentale de la méthode proposée, en imagerie ultrasonore ultra-rapide, dans le cadre de l’estimation locale de la vitesse de l’onde de pouls. Nous proposons une méthode d’estimation de mouvement combinant un marquage ultrasonore dans la direction latérale, et un estimateur de mouvement basé sur la phase des images ultrasonores. Le marquage ultrasonore est réalisé par l’intermédiaire d’oscillations transverses. Nous proposons deux approches différentes pour introduire ces oscillations transverses, une approche classique utilisant une fonction de pondération spécifique, et une approche originale par filtrage permettant de contrôler de manière optimale leurs formations. L’estimateur de mouvement proposé utilise les phases analytiques des images radiofréquences, extraites par l’approche de Hahn. Ce travail de thèse montre que la méthode proposée permet une estimation de mouvement plus précise dans la direction longitudinale, et plus généralement dans les directions perpendiculaires au faisceau ultrasonore, que celle obtenue avec d’autres méthodes plus traditionnelles. De plus, l’évaluation expérimentale de la méthode sur des séquences d’images ultrasonores ultra-rapides issues de fantômes de carotide, a permis l’estimation locale de la vitesse de propagation de l’onde de pouls, la mise en évidence de la propagation d’un mouvement longitudinal et enfin l’estimation du module de Young des vaisseaux
This work focuses on the processing of biomedical images. The aim of our study is to estimate the mechanical properties of the carotid artery in vivo using ultrasound imaging, in order to detect cardiovascular diseases at an early stage. Over the last decade, researchers have shown interest in studying artery wall motion, especially the motion of the carotid intima-media complex in order to demonstrate its significance as a marker of Atherosclerosis. However, despite recent progress, motion estimation of the carotid wall is still difficult, particularly in the longitudinal direction (direction parallel to the probe). The development of an innovative method for studying the movement of the carotid artery wall is the main motivation of this thesis. The three main contributions proposed in this work are i) the development, the validation, and the clinical evaluation of a novel method for 2D motion estimation of the carotid wall, ii) the development, the simulation and the experimental validation of the 3D extension of the estimation method proposed, and iii) the experimental evaluation of the 2D proposed method in ultra-fast imaging, for the estimation of the local pulse wave velocity. We propose a motion estimation method combining tagging of the ultrasound images, and a motion estimator based on the phase of the ultrasound images. The ultrasonic tagging is produced by means of transverse oscillations. We present two different approaches to introduce these transverses oscillations, a classic approach using a specific apodization function and a new approach based on filtering. The proposed motion estimator uses the 2D analytical phase of RF images using the Hahn approach. This thesis work shows that, compared with conventional methods, the proposed approach provides more accurate motion estimation in the longitudinal direction, and more generally in directions perpendicular to the beam axis. Also, the experimental evaluation of our method on ultra-fast images sequences from carotid phantom was used to validate our method regarding the estimation of the pulse wave velocity, the Young’s modulus of the vessels wall, and the propagation of a longitudinal movement
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Solomon, Brad K. "Methods for Identifying Acoustic Emissions From the Front Face of a Small Piezoelectric Blower." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3542.

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This thesis focuses on identifying acoustic noise generating components in piezoelectric blowers through transverse velocity measurements and the development of a numerical fluid model. Piezoelectric ceramics have proven useful for many industries and areas of research involving: high precision actuators, noise control, ultrasonic devices, and many other areas. As of late, a unique adaptation of piezoelectric ceramics is surfacing in the area of pumping and cooling. Air pumps that use these ceramics replace the traditional electric motor, resulting in lower power consumption, less moving parts, constant pressure gradients, lower overall weight, and a low profile. The current drawback of this application is the acoustic radiation produced by the blowers. Since these blowers are new to market, little research or development has been done to characterize the noise emissions. This thesis studies the acoustic emissions from the front face of a Murata piezoelectric blower. Jet noise and structural vibrations are two acoustic sources of interest that are studied in this research. A Direct Numerical Simulation (DNS) of the fluid flow through a Murata blower is developed to better identify noise generating mechanisms. The model solutions predict trends in sound pressure levels (SPL) of the jet noise and volumetric flow rates. Both the SPL and flow rate are shown to be functions of critical geometrical dimensions within the flow path of a Murata blower. Important dimensional components are identified as well as non-influential ones. Design guidelines are given to reduce noise emission from the front side of a blower and increase the volumetric flow rate. The results of this research have a direct impact on the piezoelectric blower industry and future blower designs.
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Le, Cain Aurélie. "Caractéristiques spatiales et temporelles d'une tache focale LMJ." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14475/document.

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La performance des cibles du Laser LMJ est très sensible à l'uniformité de la tache focale du laser. La technique utilisée à ce jour pour éviter les inhomogénéités est de rendre le faisceau partiellement incohérent, ce qui a pour conséquence la fluctuation de points chauds (speckles) au cours du temps, avec un effet de moyenne. De nombreux travaux ont d'ores et déjà été menés concernant l'étude de ces points chauds dans le cadre d'un faisceau unique au plan focal. Dans cette thèse, on s'intéresse à ces points chauds lorsqu'il sont issus de la superposition de faisceaux multiples, et plus particulièrement aux points chauds dans le cas de la configuration du LMJ. On a établi une équation analytique permettant de calculer la taille des points chauds dans le cas d'un speckle généré par des faisceaux multiples. Cette formule est en parfait accord avec les différents résultats obtenus par simulations numériques grâce au code PARAX. On a ainsi pu prédire la taille du grain de speckle LMJ en fonction de différentes configurations LMJ telle qu'une configuration à deux ou trois cônes et pour des choix de polarisations différents. Il en ressort que l'impact de la polarisation est assez faible sur les caractéristiques du speckle LMJ. Toutefois la double polarisation est la plus adaptée aux critères d'uniformité requis pour une bonne interaction laser-plasma. D'autre part on a montré que les grains de speckle LMJ sont de l'ordre de la longueur d'onde.Dans la seconde partie de cette thèse, on a établi les formules des contraste, temps de vie, trajectoires et vitesses des points chauds deux techniques de lissage : Lissage par Dispersion Spectrale Transverse (LDST) et Longitudinal (LDSL). Ces derniers sont respectivement utilisés sur le NIF et prochainement sur le LMJ. On a ainsi montré que quels que soient le nombre de cône et le choix des polarisations faites sur le LMJ, la durée de vie d'un point chaud LMJ est environ de 2 ps et le contraste intégré sur des temps infinis est approximativement de 15%. Les vitesses sont également très faibles (10-6c) et faiblement influencées par le choix des polarisations
The future French Laser Megajoule (LMJ) is a multiple laser beam facility built to achieve Inertial confinement Fusion (ICF). It is mainly designed for an indirect drive scheme using X-rays conversion. In this scheme, the target in the center of the hohlraum is irradiated and then compressed by the X-rays more uniformly than what it would be in a direct drive schemes. However, a high of uniformity is still needed to reach ignition since the propagation of intense laser beams in an under-critical plasma can generate laser-plasma instabilities (LPI). The control of LPI is of crucial importance for the success of ICF. By breaking both spatial and temporal coherences, the use of optical smoothing techniques, such as smoothing by spectral dispersion (SSD), often dramatically reduces LPI and also ensures the reproducibility of laser conditions from one shot to another. An accurate description of the speckle pattern in the hohlraum is thus of great interest for ICF experiments.We focus our attention on the spatial and then temporal properties of the speckles pattern generated by multiple laser beams. At first, we establish equations for the 3D speckle size based on autocorrelation functions. Numerical simulations of the propagation of multiple laser beams in vacuum are then performed with the PARAX code in configurations where the paraxial approximation can be used. The case of speckle patterns in the LMJ configuration in the zone where all the beams overlap is eventually studied. We show that such speckles have an ellipsoidal shape. Finally, influence of the polarization of the beams on the shape, size and abundance of the speckles is also investigated. In a second part we study the important aspect of temporal smoothing techniques like the movement of the speckles. This work is also triggered by the development of a statistical model that describes the motion of hot spots in order to evaluate the contrast, the trajectory and the velocity of LMJ hot spots. We address these quantities in the case of a speckle pattern generated by multiple laser beams thanks to the autocorrelation function in intensity
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Tichkule, Shiril. "On the Retrieval of the Beam Transverse Wind Velocity Using Angles of Arrival from Spatially Separated Light Sources." 2011. https://scholarworks.umass.edu/theses/727.

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For optical propagation through the turbulent atmosphere, the angle of arrival (AOA) cross-correlation function obtained from two spatially separated light sources carries information regarding the transverse wind velocity averaged along the propagation path. Two methods for the retrieval of the beam transverse horizontal wind velocity, v_t, based on the estimation of the time delay to the peak and the slope at zero lag of the AOA cross-correlation function, are presented. Data collected over a two week long experimental campaign conducted at the Boulder Atmospheric Observatory (BAO) site near Erie, CO was analyzed. The RMS difference between 10 s estimates of v_t retrieved optically, and 10 s averages of the transverse horizontal wind velocity measured by an ultrasonic anemometer, was found to be 14 cm/s for the time-delay-to- peak method and 20 cm/s for the slope-at-zero-lag method, for a 2 h period beginning 0345 MDT on 16 June, 2010, during which the transverse horizontal wind velocity varied between -1 m/s and 2 m/s.
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Books on the topic "Transverse velocity"

1

Marques, Elizabeth R. C. Stress waves in transversely isotropic media: The homogeneous problems. Cleveland, Ohio: Lewis Research Center, 1986.

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H, Williams James, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., and Lewis Research Center, eds. Stress waves in transversely isotropic media: The homogeneous problem. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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T. Wave Phenomena. Courier Dover Publications, 2014.

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Book chapters on the topic "Transverse velocity"

1

Gooch, Jan W. "Velocity of a Transverse Wave." In Encyclopedic Dictionary of Polymers, 791. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12470.

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van de Water, W. "Statistics of longitudinal and transverse velocity increments." In Fundamental Problematic Issues in Turbulence, 337–46. Basel: Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8689-5_34.

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Kahalerras, H., Y. Malecot, and Y. Gagne. "Transverse Velocity Structure Functions in Developed Turbulence." In Advances in Turbulence VI, 235–38. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_66.

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Van De Water, Willem. "Statistics of Longitudinal and Transverse Velocity Increments." In Fluid Mechanics and Its Applications, 259–62. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_64.

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Yakhot, Victor. "Statistics of Transverse Velocity Differences in Turbulence." In IUTAM Symposium on Geometry and Statistics of Turbulence, 97–106. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9638-1_12.

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Diep, John, and Lorenz Sigurdson. "Low Velocity Ratio Transverse Jets Influenced by Concentric Synthetic Jets." In Manipulation and Control of Jets in Crossflow, 257–69. Vienna: Springer Vienna, 2003. http://dx.doi.org/10.1007/978-3-7091-2792-6_20.

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Gavrishchaka, V., M. E. Koepke, J. J. Carroll, W. E. Amatucci, and G. Ganguli. "Frequency range and spectral width of waves associated with transverse-velocity shear." In Cross‐Scale Coupling in Space Plasmas, 81–85. Washington, D. C.: American Geophysical Union, 1995. http://dx.doi.org/10.1029/gm093p0081.

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Del Sorbo, P., J. Girardot, F. Dau, and I. Iordanoff. "Mesoscale Hyperelastic Model of a Single Yarn Under High Velocity Transverse Impact." In Advances in Predictive Models and Methodologies for Numerically Efficient Linear and Nonlinear Analysis of Composites, 103–24. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11969-0_7.

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Zhongqian, Ling, Li Guoneng, and Chen Mian. "The Mixing Characteristics of a Transverse Jet under Different Reynolds Number and Velocity Ratio." In Advances in Computer Science, Intelligent System and Environment, 359–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23756-0_58.

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Goncharov, Ivan, Alexey Mikhaylichenko, and Anatoly Kleschenkov. "A Novel Approach to Measurement of the Transverse Velocity of the Large-Scale Objects." In Communications in Computer and Information Science, 162–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71214-3_14.

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Conference papers on the topic "Transverse velocity"

1

La Jeunesse, Jeff W., Peter A. Sable, and John P. Borg. "Uncertainty analysis for transverse surface velocity measurements." In SHOCK COMPRESSION OF CONDENSED MATTER - 2019: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP Publishing, 2020. http://dx.doi.org/10.1063/12.0000875.

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Jensen, Jorgen Arendt. "Spectral velocity estimation in the transverse direction." In 2013 IEEE International Ultrasonics Symposium (IUS). IEEE, 2013. http://dx.doi.org/10.1109/ultsym.2013.0163.

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Pihl, Michael Johannes, and Jorgen Arendt Jensen. "Transverse oscillations for phased array vector velocity imaging." In 2010 International Ultrasonics Symposium. IEEE, 2010. http://dx.doi.org/10.1109/ultsym.2010.5935879.

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Jensen, Jorgen Arendt. "Improved vector velocity estimation using Directional Transverse Oscillation." In 2015 IEEE International Ultrasonics Symposium (IUS). IEEE, 2015. http://dx.doi.org/10.1109/ultsym.2015.0011.

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Łukasik, J., G. Auger, Ch O. Bacri, M. L. Begemann-Blaich, N. Bellaize, R. Bittiger, F. Bocage, et al. "Transverse velocity scaling in Au+Au midrapidity emissions." In NUCLEAR PHYSICS IN THE 21st CENTURY:International Nuclear Physics Conference INPC 2001. AIP, 2002. http://dx.doi.org/10.1063/1.1470021.

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Andreu Angulo, Ignacio, Holger Babinsky, Hulya Biler, Girguis Sedky, and Anya R. Jones. "Wing-Gust Interactions: The Effect of Transverse Velocity Profile." In AIAA Scitech 2020 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-0079.

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Pihl, Michael Johannes, and Jorgen Arendt Jensen. "Measuring 3D velocity vectors using the Transverse Oscillation method." In 2012 IEEE International Ultrasonics Symposium. IEEE, 2012. http://dx.doi.org/10.1109/ultsym.2012.0472.

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Mertens, Florent, and Andrei Lobanov. "Longitudinal and transverse velocity fields in parsec-scale jets." In 12th European VLBI Network Symposium and Users Meeting. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.230.0026.

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Ma, Shuai, Chengwu Yi, Chuang Luo, Yunqing Zhao, and Bingkun Xie. "The study of improving dust driving velocity on high velocity transverse plate electrostatic precipitator." In 2011 International Conference on Multimedia Technology (ICMT). IEEE, 2011. http://dx.doi.org/10.1109/icmt.2011.6003285.

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Saurabh, Aditya, Jonas P. Moeck, and Christian Oliver Paschereit. "Swirl Flame Response to Simultaneous Axial and Transverse Velocity Fluctuations." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57428.

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In this experimental study we investigate the impact of transverse acoustic velocity fluctuations on the flame transfer function in response to axial velocity fluctuations. A generic swirl flame is exposed to transverse acoustic velocities of varying amplitude and relative phase simultaneously with axial acoustic forcing. Results obtained indicate that transverse velocity affects flame response, and both the magnitude of transverse velocity and its phase with respect to axial forcing are important factors. In addition to this key results, considerations for experimental investigations dealing with transverse acoustic forcing have been discussed.
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Reports on the topic "Transverse velocity"

1

Salazar, D. V., D. J. Forliti, K. Kuzmich, and E. Coy. Near-Wall Velocity Field Measurements of a Very Low Momentum Flux Transverse Jet. Fort Belvoir, VA: Defense Technical Information Center, June 2014. http://dx.doi.org/10.21236/ada611589.

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Maron, Y., M. D. Coleman, D. A. Hammer, and H. S. Peng. Measurements of the Ion Transverse Velocity Distribution in the Gap of an Ion Beam Diode. Fort Belvoir, VA: Defense Technical Information Center, July 1986. http://dx.doi.org/10.21236/ada220531.

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Larner, K., and J. K. Cohen. Migration error in transversely isotropic media with linear velocity variation in depth. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/7201810.

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Larner, K., and J. K. Cohen. Migration error in transversely isotropic media with linear velocity variation in depth. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10184162.

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Larner, K. Dip-moveout error in transversely isotropic media with linear velocity variation in depth. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6951498.

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Larner, K. Dip-moveout error in transversely isotropic media with linear velocity variation in depth. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10183875.

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