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Tesi sul tema "Blood flow"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Tafuna'i, Nicole Denney. "Arterial Blood Flow at Rest and During Exercise with Blood Flow Restriction." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/9003.

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PURPOSE: This study comparted arterial occlusion pressure (AOP) of the superficial femoral artery (SFA) between the dominant and nondominant legs and the relationship between blood flow and occlusion pressure at rest and during muscle contractions in males and females. METHODS: The AOP of the SFA was measured using Doppler ultrasound in the dominant and nondominant legs of 35 (16 males, 19 females) apparently healthy, normotensive young adults. Blood flow in the SFA was measured in the resting state (REST) and during plantar flexion exercise (EXC) at occlusion pressures ranging from 0% to 100%

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2

Lutjemeier, Barbara June. "Control of muscle blood flow during dynamic exercise : muscle contraction / blood flow interactions." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/244.

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3

Nakashima, Tsutomu. "Autoregulation of Cochlear Blood Flow." 名古屋大学医学部, 1999. http://hdl.handle.net/2237/6202.

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4

Qamar, M. I. "Studies on intestinal blood flow." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372045.

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5

Aird, Graham Robert. "Blood flow in arterial branches." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/10887.

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6

Dahnoun, Naim. "Continuous monitoring of blood flow." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/34319.

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An extensive review of the literature revealed that there are still significant weakness in the available technology for blood flow measurement. This dissertation describes two techniques for blood velocity measurement. The first is an invasive method which uses multimodal optical fibres for light transmission to and from a sensing tip, which attenuates the light depending upon the blood velocity. The design and construction of this flowmeter is presented and bench results shown. The modulated light is transmitted to the detection and processing circuit and provision is made for the transducer

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7

Gammack, D. "Blood flow in twisted arteries." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844008/.

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The motivation for this research into flow in pipes with non-uniform geometry comes from physiological flows. It is now widely believed that haemodynamics plays an important role in the initiation and development of atherosclerosis. Experiments have shown that the preferred sites for atherogenesis are regions of low wall shear stress. The build-up of atherosclerotic plaques in the coronary arteries can lead to arterial blockage and coronary failure. Previous studies have examined uniformly curved pipes and, more recently, uniformly curved and twisted pipes. However, it is well known that the a

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8

deVries, Tiffany Dawn. "Neural Activation in Blood-Flow-Restricted Versus Non-Blood-Flow-Restricted Exercise: An fMRI Study." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5878.

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Functional magnetic resonance imaging (fMRI) can be used to track neural activation in the brain during functional activities. The purpose of this study was to investigate brain neural responses to blood flow restricted (BFR) versus control handgrip exercise. Using a randomized crossover design, 25 subjects (12 males, 13 females) completed handgrip exercises during two conditions: BFR vs. control. To familiarize participants with the exercise conditions, one week prior to MRI scanning participants completed each exercise condition once on separate days, with 72 hours between days. The followin

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9

Tosenberger, Alen. "Blood flow modelling and applications to blood coagulation and atherosclerosis." Doctoral thesis, Institut Camille Jordan, CNRS UMR 5208, Université Claude Bernard Lyon 1, Université Claude Bernard Lyon 1, France, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/244806.

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10

Willie, Christopher Kenneth. "Cerebral blood flow in man : regulation by arterial blood gases." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/47074.

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Due to the high metabolic rate of brain tissue and nominal substrate storage, brain perfusion must be precisely regulated to ensure continuous delivery of oxygen and substrates. Cerebral blood flow (CBF) is principally regulated by tissue metabolism, perfusion pressure, autonomic nervous activity, and the partial pressures of arterial oxygen (PaO₂)and carbon dioxide (PaCO₂) – an integrative process thus involving the marked influence of pulmonary gas exchange and cardiovascular function, in addition to intracranial mediators of cerebrovascular resistance. This thesis explicates the roles of

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11

Reasor, Daniel Archer. "Numerical simulation of cellular blood flow." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42760.

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In order to simulate cellular blood, a coarse-grained spectrin-link (SL) red blood cell (RBC) membrane model is coupled with a lattice-Boltzmann (LB) based suspension solver. The LB method resolves the hydrodynamics governed by the Navier--Stokes equations while the SL method accurately models the deformation of RBCs under numerous configurations. This method has been parallelized using Message Passing Interface (MPI) protocols for the simulation of dense suspensions of RBCs characteristic of whole blood on world-class computing resources. Simulations were performed to study rheological effe

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12

Järhult, Susann J. "Hyperemic Brachial Artery Blood Flow Velocity." Doctoral thesis, Uppsala universitet, Medicin, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132918.

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This thesis aims to evaluate the blood flow velocity in the Brachial artery during reactive hyperemia. Primarily to appraise the information it might contain regarding cardiovascular function and cardiovascular risk. Ultrasonographic doppler measurements of the Brachial artery were made on the 1016 men and women aged 70 included in the prospective investigation of the vasculature in Uppsala seniors (PIVUS) study. Analysis of the blood flow velocity in the forearm was made in comparison to established methods of estimating endothelial function, clinical markers of cardiovascular risk, the Frami

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13

Scott, Adrian Roy. "Peripheral blood flow and diabetes mellitus." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303002.

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14

Nasimi, Seerous Ghulam Abbas Ali. "Analysis of skin blood flow signals." Thesis, University of Bradford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305700.

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15

Koirala, Nischal. "Access Blood Flow Measurement Using Angiography." Cleveland State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu153796812445051.

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16

Jones, Elizabeth Anne Vincent Fraser Scott E. Fraser Scott E. "Blood flow and the mammalian embryo /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05262005-102319.

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17

Lorenzetti, Fulvio. "Blood flow in free microvascular flaps." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/laa/kliin/vk/lorenzetti/.

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18

Cardinal, Trevor Ryan. "Blood Flow Control During Ischemic Revascularization." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195388.

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Control of blood flow to skeletal muscle is essential to maintain the overall homeostasis of an organism. The primary route that skeletal muscle uses to accommodate an increased metabolic demand associated with physical activity is to increase its blood flow through functional hyperemia. The importance of functional hyperemia in ensuring proper skeletal muscle function spurred 130 years of investigation into the mechanism(s) regulating its occurrence.Despite not identifying the essential factor(s) for controlling skeletal muscle blood flow, the last century of investigation has uncovered muc

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19

Arciero, Julia. "Theoretical Models of Blood Flow Regulation." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/195903.

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In normal tissues, blood supply is closely matched to tissue demand for wide ranges of oxygen demand and arterial pressure. This suggests that multiple mechanisms regulate blood flow. Theoretical models can be used to analyze these interacting mechanisms. One proposed mechanism for metabolic flow regulation involves the saturation-dependent release of ATP by red blood cells, which triggers an upstream conducted response signal and arteriolar vasodilation. To analyze this mechanism, oxygen and ATP levels are calculated along a flow pathway of seven representative segments, including two vas

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20

Kuzborska, Zyta. "Research of blood flow and stresses in the pathological blood vessels." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120131_135725-24904.

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Physical load, age and gender influence to blood pressure and maximal stresses in the pathological blood vessel palaces was studies in this work. The main research subject – pathological blood vessel and its blood flow processes that depend on physical load, pathology degree and type, age, gender and blood vessels stress characteristics. The main aim of this work – to examine blood flow characteristics, local blood pressure, stress distribution in the pathological blood vessels dependent physical load assessing blood vessels mechanical properties variations due to age, gender, blood vessel pat

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21

Picot, Paul A. "Blood flow visualization and flow rate estimation with colour Doppler ultrasound." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32324.pdf.

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22

Petersson, Sven. "Fast and Accurate 4D Flow MRI for Cardiovascular Blood Flow Assessment." Doctoral thesis, Linköpings universitet, Avdelningen för kardiovaskulär medicin, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-100146.

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Abstract (sommario):

The study of blood flow is essential in understanding the physiology and pathophysiology of the cardiovascular system. Small disturbances of the blood flow may over time evolve and contribute to cardiovascular pathology. While the blood flow in a healthy human appears to be predominately laminar, turbulent or transitional blood flow is thought to be involved in the pathogenesis of several cardiovascular diseases. Wall shear stress is the frictional force of blood on the vessel wall and has been linked to the pathogenesis of atherosclerosis and aneurysms. Despite the importance of hemodynamic f

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23

Rahimian, Abtin. "Parallel algorithms for direct blood flow simulations." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43611.

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Fluid mechanics of blood can be well approximated by a mixture model of a Newtonian fluid and deformable particles representing the red blood cells. Experimental and theoretical evidence suggests that the deformation and rheology of red blood cells is similar to that of phospholipid vesicles. Vesicles and red blood cells are both area preserving closed membranes that resist bending. Beyond red blood cells, vesicles can be used to investigate the behavior of cell membranes, intracellular organelles, and viral particles. Given the importance of vesicle flows, in this thesis we focus in efficient

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24

Framle, Peter Thomas James. "Blood flow and transport in artificial devices." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399319.

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25

John, Gareth W. "Measurement of venous blood flow using photoplethysmography." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/54076/.

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This simple, non-invasive test will reduce the patient numbers requiring the more time-consuming ultrasound examination, by screening out a high proportion of individuals who definitely do not have lower limb DVT. However, further signal processing methods should be investigated to improve the specificity of the test.

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26

Poulin, Marc J. "Aspects of cerebral blood flow in humans." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:a2af655f-9198-4cd0-a126-57c070f6399d.

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The technique of transcranial Doppler ultrasound (TCD) was used to assess cerebral blood flow (CBF) in humans. Studies were performed at rest and during dynamic submaximal exercise. In the resting experiments, TCD was combined with the technique of dynamic end-tidal forcing to study the dynamics of the CBF response to step changes in end-tidal (i.e. arterial) PC02 and PO2 In the resting and exercise experiments, the degree of consistency was examined between three indices of CBF that can be extracted from the TCD spectrum. Finally, the ventilatory and the CBF responses to acute isocapnic hypox

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27

Diwei, He M. Res. "Full field laser doppler blood flow sensor." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523084.

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28

Kongsavatsak, Chayut. "Full field laser doppler blood flow camera." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489689.

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Laser Doppler Blood Flowmetry is a non-invasive technique that has been I developed and used for measuring microvascular blood flow in tissue. The technique utilises the backscattering of the laser light from moving red blood cells and static tissue in order to extract information such as the concentration and flow. This thesis describes the early stages of the development of an integrated optical sensor array to perform full field laser Doppler blood flow imaging. This technique will eliminate the need for mechanical scanning and the data bottleneck that exists between the photodiode array an

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29

Hazel, A. L. "Modelling of blood flow near arterial walls." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603908.

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In this thesis, theoretical models of fluid flows close to arterial walls are studied. There are two main areas of study: (i) Flow near an oscillating stagnation point. The existence of a stagnation point which oscillates in position as well as in strength has been observed at certain sites prone to occlusive arterial disease. The two oscillations can interact non-linearly, altering the mean shear stress distribution on the wall. The problem is studied analytically and numerically in two and three dimensions, where in the three-dimensional case the basic stagnation-point flow is axisymmetric.

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30

陳君漢 and Kwan-hon Chan. "Intracranial blood flow velocity following head injury." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31979567.

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31

Al-Saad, Mohammed. "Blood flow simulation using smooth particle hydrodynamics." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/105588/.

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Blood flow rheology is a complex phenomenon, and the study of blood flow in the human body system under normal and pathological conditions are considered to be of great importance in biomedical engineering. Consequently, it is important to identify the key parameters that influence the flow behaviour of blood. The characterisation of blood flow will also enable us to understand the flow parameters associated with physiological conditions such as atherosclerosis. Thrombosis plays a crucial role in stopping bleeding when a blood vessel is injured. Developing tools that can successfully study the

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32

Mazzeo, M. D. "Lattice-Boltzmann simulations of cerebral blood flow." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19357/.

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Computational haemodynamics play a central role in the understanding of blood behaviour in the cerebral vasculature, increasing our knowledge in the onset of vascular diseases and their progression, improving diagnosis and ultimately providing better patient prognosis. Computer simulations hold the potential of accurately characterising motion of blood and its interaction with the vessel wall, providing the capability to assess surgical treatments with no danger to the patient. These aspects considerably contribute to better understand of blood circulation processes as well as to augment pre-t

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33

Myers, Lance Jonathan. "Mathematical modeling of foetal arterial blood flow." Doctoral thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5143.

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Bibliography: leaves 187-211.<br>The aim of this thesis was to develop an accurate and comprehensive computer model of the foetal circulatory system and to use this model to investigate influences of various haemodynamic viriables on common Doppler blood flow velocity waveform indices. The foetal model consists of an number of vascular compartments, cascaded together using electrical transmission line analogies.

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34

Thomas, Stephen. "Antithrombotic agents under flow conditions." Thesis, Open University, 2003. http://oro.open.ac.uk/54153/.

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Haemostasis is the result of a fine balance of interactions between the endothelium, plasma proteins and blood cells under a wide range of flow rates. To mimic these conditions in vitro, a parallel plate flow chamber with human umbilical vein endothelial cells (HUVEC) or extracellular matrix (ECM) has been developed. A method to investigate thrombin generation (TG) in platelet rich defibrinated plasma was validated and used to investigate inhibition by two distinct classes of antithrombotic agents: anti-platelet antibodies and anticoagulants, including unfractionated heparin (UFH), low molecul

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35

Jayasinghe, Dulip. "The effect of blood pressure on the cerebral blood flow of preterm infants." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490972.

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During the early postnatal period, some preterm infants experience periods of hypoxia, hypotension or both. Hypotension is associated with significant cerebral lesions and contributes to morbidity and mortality. The aetiology of the lesions is thought to be secondary to a loss of Cerebral Blood Flow (CBF) autoregulation, resulting in a pressure-passive CBF. Treatment of hypotension may require the use of inotropic agents that may also affect CBF. CBF can be measured by a number of techniques; one quantitative method is the intravenous 133Xe technique. To investigate the effects of blood pressu

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36

Appaji, Abhisara Apoorva. "Estimating Cerebral Blood Flow from a Flow from a Rotatinal Angiographic System." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504287.

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37

Born, Silvia. "Illustrative Flow Visualization of 4D PC-MRI Blood Flow and CFD Data." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-154354.

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Das zentrale Thema dieser Dissertation ist die Anwendung illustrativer Methoden auf zwei bisher ungelöste Probleme der Strömungsvisualisierung. Das Ziel der Strömungsvisualisierung ist die Bereitstellung von Software, die Experten beim Auswerten ihrer Strömungsdaten und damit beim Erkenntnisgewinn unterstützt. Bei der illustrativen Visualisierung handelt es sich um einen Zweig der Visualisierung, der sich an der künstlerischen Arbeit von Illustratoren orientiert. Letztere sind darauf spezialisiert komplizierte Zusammenhänge verständlich und ansprechend zu vermitteln. Die angewendeten Techniken

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38

Ramström, Sofia. "The role of platelets in whole blood coagulation /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/med776s.pdf.

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39

Norris, David G. "NMR flow imaging." Thesis, University of Aberdeen, 1986. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU009818.

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The phase-encoded method of NMR flow imaging is examined in detail. The motion of isochromatic groups in the direction of suitably balanced magnetic field gradients will give a phase change in the NMR signal directly proportional to the velocity, acceleration, or higher derivative of position, dependent upon the form of the field gradient. If a simple bipolar pulse is used then the phase change, for isochromats moving with constant velocity, will be proportional to the velocity. If two such pulses are placed back to back then the phase change is proportional to the acceleration. The motion of

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40

Thistlethwaite, John R. "The Role of Acidosis on Vascular Function during Dynamic Handgrip Exercise and Flow-mediated Dilation." Connect to full text in OhioLINK ETD Center, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1216833858.

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Dissertation (Ph.D.)--University of Toledo, 2008.<br>Typescript. "Submitted as partial fulfillment of the requirements for The Doctor of Philosophy degree in Exercise Science." Bibliography: leaves 5-7, 24-34, 61-66, 88-92.

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41

Nishimura, Nozomi. "Microvascular lesions and blood flow in rodent cortex." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3211912.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed July 10, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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42

Von, Krüger Marco Antônio. "Doppler ultrasound tracking instrument for monitoring blood flow." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/29367.

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There are situations, during surgery, in the immediate post-operative period, and in neonatal and adult intensive care units, where monitoring the blood supply to a certain organ or region of the body could be of great value. Doppler ultrasound has great potential for monitoring blood flow velocity because it is a reliable, noninvasive method and produces results in real time. In addition, the development of Doppler technology associated with the recent progress of electronics and computerization has widened the range of information that can be extracted from the Doppler signal. Despite its gr

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43

Moore, Jennifer Anne. "Computational blood flow modelling in realistic arterial geometries." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/NQ35257.pdf.

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Macgowan, Christopher K. "Fast measurements of blood flow using magnetic resonance." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ59009.pdf.

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45

Newton, Bradley Scot. "Blood flow evaluation using an intracoronary doppler catheter." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/16404.

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46

Lieberman, Howard M. "Modulation of penile blood flow through vasoactive agents." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30846.

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The erectile mechanism is a sequential cascade of events, involving many chemical messengers, perhaps the most important one being nitric oxide (NO). NO is a putative neurotransmitter involved in the non-adrenergic non-cholinergic (NANC) system and is synthesized by the enzyme nitric oxide synthase (NOS). NOS has been localized in peripheral autonomic nerves innervating vascular and non-vascular smooth muscles in many organ systems.<br>The introduction of intracavernous injection (ICI) of vasoactive agents in 1981 was an effective means to restore erectile function for men with erectile dysfun

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47

Gates, Andrew R. C. "Blood flow studies using nuclear magnetic resonance imaging." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260496.

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48

Ardilouze, Jean-Luc. "Regulation of adipose tissue blood flow in humans." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409721.

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49

Vejlstrup, Niels Grove. "Liquid balance and blood flow in the lungs." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386661.

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50

吳志萍 and Chi-ping Ng. "Cerebral blood flow monitoring of brain injured patients." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31214484.

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