Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 51 for “"Pressure profile"”.
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Chronic kidney disease prevalence and ambulatory blood pressure profile in healthy HIV positive subjects pre and post anti-retroviral therapy
… HIV have been associated with abnormal metabolic profile, increased cardiovascular risk and renal disease1,2,3. Hypertension has been found to be common in HIV infected individuals, in European and American cohorts, with a prevalence ranging from 13- 34%2. Nocturnal blood pressure (BP) is superior …
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HYDRODYNAMIC CHARACTERISTICS AND COAL COMBUSTION MODELING OF A HIGH VELOCITY FLUIDIZED BED (SOLIDS FRICTION FACTOR, TWO PHASE FLOW, PRESSURE PROFILE, FAST)
… in coal combustion. It can be operated under pressure making it eminently suited for the production of high temperature gas from coal for operating gas turbines for power generation. The LFB can operate over a wide range of gas flow rates and coal can be introduced at various points without …
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Equilibrium and stability studies of plasmas confined in a dipole magnetic field using magnetic measurements
… and operated to reconstruct the plasma pressure profile through least-squares fitting to model profiles. Although both isotropic and anisotropic models are used, the latter is critical in deducing the correct beta values for the electron cyclotron resonance heated (ECRH), anisotropic LDX …
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Iterative learning control for improved tracking of fluid percussion injury device
… the injury but does not execute the desired pressure profile. The controller used is a QCI-S3-IG Silver Sterling from Quick Silver Controls. A limitation innate to the controller was a 3-millisecond sampling of the input signal that proved challenging for developing fast, accurate FPI pulses …
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Flow Field Computations of Combustor-Turbine Interactions in a Gas Turbine Engine
… at a combustor exit shows non-uniformities in pressure, temperature, and velocity in the pitch and radial directions. This inlet profile to the turbine can have a considerable effect on the development of the secondary flows through the vane passage. This thesis presents a computational study …
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Experimental Analysis of an Advanced-Design, Quasi-Radial Diffuser Receiving an Oscillating Jet
… flow impinged produced an asymmetric static pressure profile. This was probably due to the mechanism that set up the oscillations in the flow, the rotating baffle.
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A Unified Model for Multi-Phase Flow and Heat Transfer in Wellbores
… A unified model was developed to predict the pressure profiles in wellbores using models available in the literature, which was then used to develop a simulator. A rigorous approach was also taken to model heat transfer and predict the temperature profiles in wellbores unde, various …
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The Galaxy and beyond with the Arcminute Microkelvin Imager
… a fundamental problem with the 'universal' pressure profile currently favoured for modelling clusters. In an attempt to address the discrepancy, I use simulations to investigate the effect of allowing the shape of the pressure profile to vary. The derived parameter constraints are found to …
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An Investigation of Distortion Indices for Prediction of Stalling Behavior in Aircraft Gas Turbine Engines
… capability with constant speed loss in stall pressure ratio, constant mass loss in stall pressure ratio, and engine speed where appropriate. Predictive indices/models were compared directly with experimental data. In addition, the concept of including the effects of compressor dynamic response …
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Frequency Domain Methods for Predicting the Transport of Non-Uniform Flow Through Turbomachinery Compressors
… to predict the transport of non-uniform total pressure distributions through an axial flow compressor is presented. The method relies on frequency-domain transformations of total pressure distortion patterns, and the use of digital filter techniques to capture the effect of a blade row on the …
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Phase equilibrium study of methane hydrate
… 34°F, 36°F and 40°F and the initial pressures were in the range of 1000--1200 psi. Variation of the methane pressure was monitored with time during the formation run. Dissociation experiments were then carried out and the pressure profile along the core with time was recorded. The …
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Modelling techniques for 1-3 composite transducers
… A novel algorithm for calculating the acoustic pressure profile, resulting from an arbitrarily excited, rectangular aperture is employed to determine the field structure of the composite transducer. This algorithm is incorporated into an array model capable of predicting the field …
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Design of a dynamic balance assessment system
… the subject's postural sway by using a foot pressure profile plate to determine how much deviation there was during testing. This system was also designed to be more versatile and affordable than what is currently available commercially, as while these machnes are important for studies they …
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DEM simulated floor pressure induced by a granular column
… H. A. Janssen discovered that the bottom floor pressure in a cylindrical container of granular material asymptotes exponentially to a value less than the weight of the material i.e., the pressure becomes independent of the fill height of the column. This phenomenon is investigated using discrete …
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Pressure profiles of plasmas confined in the field of a dipole magnet
… the maintenance and stability of plasma pressure confined by a strong magnetic field is a fundamental challenge in both laboratory and space plasma physics. Using magnetic and X-ray measurements on the Levitated Dipole Experiment (LDX), the equilibrium plasma pressure has been …
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Investigation into the discrepancies between computational fluid dynamics lift predictions and experimental results
… effective change in the Kutta Condition due to pressure biasing associated with vortex asymmetry. The net result is a consistent overprediction of mean lift. Based on an analysis of over 1000 historical experiments an empirical model is developed to allow the error in predicted lift coefficient …
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Tearing-mode transport model in the reversed field pinch concept
… Taylor's relaxation model, the self-consistent pressure profile is determined by assuming that the ohmic heating source raises the plasma pressure until the profile is locally marginally stable to tearing modes. A critical point here is the long held belief that an RFP, because of its bad …
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An Experimental and Analytical Investigation of Dynamic Flow Response of a Fan Rotor with Distorted Inlet Flow
… with inlet flow distortion. Rotor exit total pressure circumferential profiles were accurately predicted using frequency response functions derived from experimental rotor response data. Using these predicted profiles, an initial attempt was made at predicting the dynamic (distorted) stage …
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Shockwave energy dissipation by mechanoresponsive materials
Shockwaves are characterized by high pressure and strain rate with extremely short duration about nanoseconds. Blast-induced traumatic brain injury sustained by personnel exposed to shockwave-generating high-energy explosives results in costly and debilitating health effects. Novel approaches for …
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