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Showing 1 to 20 of 141 for “"pulsatile"”.
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Pulsatile Electropolishing of Nitinol Stents
… _exibility, a variety of alternating current pulsatile waveforms were investigated and the resulting e_ect on surface topology was observed using SEM and AFM microscopes. Di_erential pulse voltammogram yielded a feedback parameter on surface composition, and various pulse parameters were …
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Pulsatile blood flow in the arteries
… partial differential equations for pulsatile flow in a flexible tube. The fluid is assumed to be a Newtonian, incompressible liquid similar to blood. The vessel is modeled as circular in cross section and tapering with increasing distance from the heart. The governing equations are …
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System identification of cortisol secretion : characterizing pulsatile dynamics
… we present a mathematical characterization of pulsatile cortisol secretion. We hypothesize that there is a controller in the anterior pituitary that leads to pulsatile release of cortisol, and propose a mathematical formulation for such controller. Our proposed controller achieves impulse …
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Transition to turbulence and relaminarization of pulsatile pipe flows
… transition to turbulence and its evolution in pulsatile pipe flows involving both, reverse and no-reverse flows, is the primary focus of this experimental work. A piston driven by a programable DC servo motor was used to set up a water flow system and provide the pulsation characteristics. …
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Fluid-Structure Interaction of Large Viscoelastic Vessels Under Pulsatile Conditions
… into the response of compliant vessels to pulsatile flow for the purposes of properly characterizing the vessel-wall material properties. The structural deformation of, and flow field within, the compliant vessel were recorded using ultrasound imaging. The ultrasound data were then used to …
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Pulsatile Flow in Computational Modelling of Thrombosis in Cerebral Aneurysms
… inexpensive steady flow conditions. However, pulsatile flow better characterizes blood flow in-vivo. Steady flow is an acceptable approximation of pulsatile flow from a fluid dynamics perspective, but there is no prior evidence suggesting whether it is an acceptable approximation when …
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Discharge characteristics of auditory nerve fibers for pulsatile electrical stimuli
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Numerical simulation and experimentation of pulsatile flows in axisymmetric arterial models
… <p>NUMERICAL SIMULATION AND EXPERIMENTATION OF PULSATILE FLOWS IN AXISYMMETRIC ARTERIAL MODELS </p> <p>by</p> <p>TADESSE GEBREEGZIABHER</p> <p>December 2011</p> <p>Co-advisors: 1. Dr. Emmanuel Ayorinde 2. Dr. Trilochan Singh</p> <p>Major: Mechanical Engineering </p> <p>Degree: Doctor of …
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LES of pulsatile flow in the models of arterial stenosis and aneurysm
… different types of Newtonian and non-Newtonian pulsatile blood flow in a constricted as well as in a dilated channel to gain insight of the transition-to-turbulent blood flow due to the arterial stenosis and aneurysm. In the stenosed model, a cosine shape stenosis is placed at the upper wall of …
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In Vitro Regulation of Ptgs2 and Nos3 Expression in Clonal Osteogenic Cells Following Pulsatile Fluid Flow
… (MLO-Y4) and osteoblasts (2T3) were subjected to pulsatile fluid flow to determine changes in mRNA levels of Ptgs2 (COX-2) and Nos3 (eNOS). The pattern of Ptgs2 expression in these cell types support the hypothesis that osteocytes are the mechanosensors in bone. The data further supports the …
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A fluid-structure interaction finite element analysis of pulsatile blood flow through a compliant stenotic artery
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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An electrochemical investigation of mass transfer and shear stress in pulsatile laminar flow : implications for atherogenesis,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1973.
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The Influence of Normal Physiological Forces on Porcine Aortic Heart Valves in a Sterile Ex Vivo Pulsatile Organ Culture System
The aortic valve functions in a complex mechanical environment which leads to force dependent cellular and tissue responses. Characterization of these responses provides a fundamental understanding of valve pathogenesis. The aim of this work was to develop an ex vivo organ culture system capable of …
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