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Dissertations / Theses on the topic 'Circulation velocity'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Duhaut, Thomas H. A. "Wind-driven circulation : impact of a surface velocity dependent wind stress." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101117.

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The use of an ocean surface velocity dependent wind stress is examined in the context of a 3-layer double-gyre quasigeostrophic wind-driven ocean circulation model. The new wind stress formulation results in a large reduction of the power input by the wind into the oceanic circulation. This wind stress is proportional to a quadratic function of Ua--u o, where Ua is the wind at 10m above the ocean surface and uo is the ocean surface current. Because the winds are typically faster than the ocean currents, the impact of the ocean surface velocity on the wind stress itself is relatively small. How

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2

Gorle, Jagan Mohan Rao. "Development of Circulation Controlled Blade Pitching Laws for Low-Velocity Darrieus Turbine." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0021/document.

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L'étude développée dans cette thèse concerne le contrôle des performances et des lâchers tourbillonnaires au cours du cycle de rotation d'une hydrolienne à axe vertical de type Darrieus. L'élaboration d'une famille de lois de commande d'incidence de pales exploitant le principe de conservation de la circulation autour de profils en mouvement permet ici le contrôle du fonctionnement de l'hydrolienne ainsi que la maîtrise de son sillage tourbillonnaire afin de préserver l'environnement.L'écoulement 2D est simulé à l'aide du solveur incompressible de Star CCM+ afin de mettre en évidence l'effet d

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3

Riley, Jonathan David Charles. "The velocity of circulation of money : empirical evidence for the United Kingdom, 1870-1991." Thesis, London Metropolitan University, 1995. http://repository.londonmet.ac.uk/3110/.

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The equation of exchange is not in itself a theory of the demand for money. It can be argued that it is no more than an identity velocity determines the value of velocity. Given certain assumptions it can be a theory of the aggregate price level. One such supposition is that velocity is a constant, or at least a stable function of a few variables. Velocity over time is far from being a constant. Friedman argues that this is mainly due to errors of measurement and deviations between actual and desired velocity. Keynes suggests that there is no reason to believe that velocity is stable, and that

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4

Najarzadegan, Farshid. "Circulation Dependence of the Interaction Between a Wing-Tip Vortex and Turbulence." UKnowledge, 2019. https://uknowledge.uky.edu/me_etds/145.

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Vortices are present in many fluid flows and depending on the context they may be either beneficial or harmful for different systems or processes. Planar particle image velocimetry was used to examine the vortex evolution and its decay under different turbulence intensities and vortex circulation. The vortex decayed faster in the presence of high turbulence intensity. Vortex trajectories were impacted by turbulence intensity and vortex strength. Trajectories with no turbulence intensity had less variation. The vortex wandering amplitude decreased with growth of vortex strength. The vortex deca

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5

Hafsi, Amine. "DNS and LES of Scalar Transfer Across an Air-water Interface during Inception and Growth of Langmuir Circulation." Scholar Commons, 2017. https://scholarcommons.usf.edu/etd/7406.

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Direct numerical simulations (DNS) of an initially quiescent coupled air-water interface driven by an air flow with free stream speed of 5 m/s have been conducted. The DNS solves a scalar advection-diffusion equation for dissolved gas (or scalar) concentration in order to determine the impact of the water-side turbulence on scalar (mass) transfer from the air side to the water side and subsequent vertical transport in the water column. Two simulations are compared: one with a freely deforming interface and a second one with a flat interface. In the first simulation, the def

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6

Lagerkvist, Birgitta Json. "Systemic effects of occupational exposure to arsenic : with special reference to peripheral circulation and nerve function." Doctoral thesis, Umeå universitet, Klinisk fysiologi, 1989. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-101288.

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Smelter workers who were exposed to air-borne arsenic for a mean of 23 years, and age-matched referents, were examined with clinical, physiological, and neurophysiological methods. Exposure to arsenic in workroom air was estimated to have been around the Swedish occupational limits, which were 500 yg/m before 1975 and 50 yg/ra thereafter. An increased preval ence of Raynaud's phenomenon and a reduced finger systolic blood pressure (FSP) during local and general cooling were found in the smelter workers. Slight, but significant sub-clinical neuropathy, in the form of slightly reduced nerve cond

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7

Wallin, Ashley Kay. "Renal Arterial Blood Flow Quantification by Breath-held Phase-velocity Encoded MRI." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4982.

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Autosomal dominant polycystic disease (ADPKD) is the most common hereditary renal disease and is characterized by renal cyst growth and enlargement. Hypertension occurs early when renal function is normal and is characterized by decreased renal blood flow. Accordingly, the measurement of blood flow in the renal arteries can be a valuable tool in evaluating disease progression. In studies performed in conjunction with this work, blood flow was measured through the renal arteries using magnetic resonance imaging (MRI). In order to validate these in vivo measurements, a vascular phantom was c

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8

Tomić, Lidija. "Studies on Retinal Circulation in Experimental Animals, Healthy Human Eyes and Eyes with Diabetic Retinopathy." Doctoral thesis, Uppsala universitet, Institutionen för neurovetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9396.

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The retina is a highly metabolically active tissue with large demands on the supply of nutrients. Disorders affecting the retina often include some vasculopathy with an impact on retinal circulation. Studies of retinal haemodynamics could thus help to detect, differentiate and diagnose diseases, to monitor changes in disease as well as progression and efficiency of the therapy. The present studies were an attempt to validate and determine the clinical usefulness of a newly developed technique for studying the retinal circulation in human eyes. We used different techniques to evaluate different

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9

Федорченко, С. В., та А. Г. Серяков. "Моделювання процесу диспергування суспензій у бісерному млині на основі фаззі-логіки". Thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/67509.

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Розроблена система управління диспергування суспензії дозволила добитися оптимального заповнення суспензією бісерної млини незалежно від швидкості циркуляції суспензії в системі, а також дозволило скоротити часу диспергування. Розроблена система управління ефективна і за наявності широкосмугових обурень.

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10

Benmadda, El Mostafa. "Etude de l'ecoulement pulse d'un fluide incompressible dans une conduite elastique : application a la circulation arterielle." Poitiers, 1987. http://www.theses.fr/1987POIT2267.

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11

Akan, Cigdem. "Surface Mass Transfer in Large Eddy Simulation (LES) of Langmuir Turbulence." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3944.

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Over the past century the study of gas exchange rates between the atmosphere and the ocean has received increased attention because of concern about the fate of greenhouse gases such as CO2 released into the atmosphere. Of interest is the oceanic uptake of CO2 in shallow water coastal regions as biological productivity in these regions is on average about three times larger than in the open ocean. It is well-known that in the absence of breaking surface waves, the water side turbulence controls gas transfer of sparingly soluble gases such as CO2 from the air to the water. The dependence of ga

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12

Bernardes, Marcos Eduardo Cordeiro. ""Circulação estacionária e estratificação de sal em canais estuarinos parcialmente misturados: simulação com modelos analíticos"." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/21/21132/tde-05102001-085052/.

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O presente estudo descreve a circulação estacionária e a estratificação de sal no sistema estuarino de Cananéia e no Canal de Bertioga. Os modelos de Hansen & Rattray (1965), Fisher et al. (1972), Prandle (1985) e Miranda (1998) foram escolhidos para a simulação dos perfis verticais do componente longitudinal da velocidade e da salinidade. Os dados experimentais utilizados na calibração desses modelos foram amostrados ao longo de 41 estações fixas de pelo menos 13 horas ou um ciclo de maré semidiurna. Os modelos reproduziram com boa fidelidade condições experimentais bem misturadas e parcialme

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13

Rhodes, M. J. "High velocity circulating fluidized beds." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373219.

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14

Camargo, Eduardo Freitas Moraes de. "Tratamento anaeróbio de águas residuárias, em batelada, com microrganismos imobilizados e circulação da fase aquosa." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-13072018-082510/.

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O presente trabalho constou da concepção de um reator anaeróbio em regime de batelada com circulação da fase aquosa contendo biomassa imobilizada em espuma de poliuretano. O reator foi operado em ciclos de 8 h e mantido a 30 ± 1ºC tratando água residuária sintética elaborada à base de glicose, com concentração de aproximadamente 500 mgDQO/L. O estudo hidrodinâmico realizado com velocidade superficial de recirculação entre 0,16 e 0,80 cm/s indicou que o tempo de mistura obtido em todas as condições pode ser considerado desprezível quando comparado ao tempo total do ciclo, e também permitiu cons

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15

Mendes, Caroline Eliza. "Avaliação das condições hidrodinâmicas, de transferência de oxigênio e de cisalhamento em diferentes modelos e escalas de reatores pneumáticos." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/7928.

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Submitted by Izabel Franco (izabel-franco@ufscar.br) on 2016-10-05T19:18:20Z No. of bitstreams: 1 TeseCEMac.pdf: 12049463 bytes, checksum: acd65707762e60b912f35a2d267ad5b7 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-20T13:40:54Z (GMT) No. of bitstreams: 1 TeseCEMac.pdf: 12049463 bytes, checksum: acd65707762e60b912f35a2d267ad5b7 (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-20T13:41:14Z (GMT) No. of bitstreams: 1 TeseCEMac.pdf: 12049463 bytes, checksum: acd65707762e60b912f35a2d267ad5b7 (MD5)<br>Made

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16

Elam, Kevin Patrick. "Effects of a surface circulator on temperature, dissolved oxygen, water velocity, and photosynthetic yield in Falling Creek Reservoir." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/36454.

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Cyanobacteria are a naturally occurring component of reservoir aquatic ecosystems. Given that some species possess the ability to control their depth within the water column, they have a competitive advantage over other species of photosynthetic organisms. This leads to the potential for cyanobacteria blooms, and because of taste and odor problems, as well as possible toxin production associated with certain species of cyanobacteria, these organisms can cause major problems in drinking water production. The Western Virginia Water Authority installed a solar-powered circulator in Falling Cre

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17

Baaklini, Georges. "Characterization of the Eastern Mediterranean surface dynamics : Insights from drifter assimilation and machine learning techniques." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS186.

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Une estimation précise de la circulation de surface est cruciale en raison de son impact direct sur les propriétés physiques et bio-géochimiques du du milieu marin. Cependant, l’estimation des courants reste un défi car le champ de circulation est affecté par des flux qui changent rapidement. Ce problème s’accentue en Méditerranée orientale, où les observations in-situ sont relativement rares et où les imprécisions des observations altimétriques augmentent. Par conséquent, certaines des caractéristiques de méso-échelle sont encore débattues ou inconnues, en particulier dans le bassin levantin.

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18

Kokkalis, Efstratios. "Fluid dynamic assessments of spiral flow induced by vascular grafts." Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/5b96492f-983f-4baa-8e48-20da6939e65c.

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Peripheral vascular grafts are used for the treatment of peripheral arterial disease and arteriovenous grafts for vascular access in end stage renal disease. The development of neo-intimal hyperplasia and thrombosis in the distal anastomosis remains the main reason for occlusion in that region. The local haemodynamics produced by a graft in the host vessel is believed to significantly affect endothelial function. Single spiral flow is a normal feature in medium and large sized vessels and it is induced by the anatomical structure and physiological function of the cardiovascular system. Grafts

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19

Cellier, Loïc. "Evitement de conflits aériens par une régulation subliminale en vitesse : modélisation & résolution via le contrôle optimal." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30194.

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À travers une approche de contrôle optimal, cette thèse de doctorat propose une étude des modèles et des techniques de résolution dans un domaine d'application propre à la gestion du trafic aérien. Motivés par la croissance des flux aériens d'une part, et les développements en théorie du contrôle optimal d'autre part, ces travaux portent sur l'analyse du problème d'évitement de conflits aériens. Cette étude permet le développement de nouvelles approches et algorithmes en vue d'aider les contrôleurs aériens dans leur tâche. Ainsi, dans le cadre du trafic aérien, afin de préserver des distances

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20

Novák, Martin. "Generace vířivosti rychlostního pole gradientem entropie." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-305697.

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The master thesis studies the impact of the entropy gradient on the vorticity of ve- locity field, particularly by applying the linear momentum balances. These balances are formulated for Thermo-viscous fluids (later fluids) and Thermo-viscous-elastic ma- terial (later solids) with the other balances (energy, mass, etc.). In order to derive these balances, the Classical continuum mechanics approach is used along with the respec- tive Variational principles. The thesis emphasizes the Variational principles applica- tion representing the modification of the Bateman principle [Bat29] and its comp

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21

"Data acquisition and analysis for reopneumographic study." Chinese University of Hong Kong, 1993. http://library.cuhk.edu.hk/record=b5887796.

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by Leung Chung-chu.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1993.<br>Includes bibliographical references (leaves 101-107).<br>ABSTRACT --- p.i<br>ACKNOWLEDGEMENTS --- p.iii<br>LIST OF ABBREVIATIONS --- p.iv<br>LIST OF PUBLICATIONS --- p.v<br>TABLE OF CONTENTS --- p.vi<br>Chapter CHAPTER 1 --- Introduction<br>Chapter 1.1 --- Background of the Rheopneumograph --- p.1<br>Chapter 1.2 --- The Electrical Bio-impedance (EBI) technique used in Rheopneumography --- p.2<br>Chapter 1.3 --- Problems with analysis of Rheopneumograph --- p.6<br>Chapter 1.4 --- The EBI measurement unit

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22

Wang, Chi-En, and 王志恩. "The Investigation of Solids Velocity in the Circulating Fluidized Beds." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/29529983307090359878.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>96<br>The local time-mean particle velocity profile in the different flow regimes and solid circulation rate was acquired by optical fiber probes which detected at the different axial and radial positions in a 0.108 m i.d., 5.75 m high with 0.108 m i.d., 5.75 m high expanded-top circulating fluidized bed for FCC catalyst (dp=78 microns, particle density =1880 kg/m3). Upstream and downstream light signals which reflect from particles were received by optical fiber probes and were used to compute delay time by cross-correlation function. Then the local time- mean part

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23

"Experimental investigation of structure function and flow circulatin of the velocity field in turbulent thermal convection." 2011. http://library.cuhk.edu.hk/record=b5894664.

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Qi, Pengfei = 湍流熱對流中速度場結構函數和流動循環的實驗研究 / 齊鵬飛.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (p. 65-69).<br>Abstracts in English and Chinese.<br>Qi, Pengfei = Tuan liu re dui liu zhong su du chang jie gou han shu he liu dong xun huan de shi yan yan jiu / Qi Pengfei.<br>Abstract --- p.i<br>摘要 --- p.ii<br>Acknowledgements --- p.iii<br>Contents --- p.iv<br>List of Figures --- p.vi<br>List of Tables --- p.X<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- What is turbulence? --- p.1<br>Chapter 1.2 --- Why study turbulence a

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24

Zamboni, P., E. Menegatti, P. Conforti, Simon J. Shepherd, M. Tessari, and Clive B. Beggs. "Assessment of cerebral venous return by a novel plethysmography method." 2012. http://hdl.handle.net/10454/6249.

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BACKGROUND: Magnetic resonance imaging and echo color Doppler (ECD) scan techniques do not accurately assess the cerebral venous return. This generated considerable scientific controversy linked with the diagnosis of a vascular syndrome known as chronic cerebrospinal venous insufficiency (CCSVI) characterized by restricted venous outflow from the brain. The purpose of this study was to assess the cerebral venous return in relation to the change in position by means of a novel cervical plethysmography method. METHODS: This was a single-center, cross-sectional, blinded case-control study conduct

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