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 38 for “"Elevated pressure"”.
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Viscosity of simple liquids including measurement and prediction at elevated pressure
… and eight halogenated hydrocarbons at pressures up to 500 MN m⁻² in the temperature range 25˚C to 100˚C. Two isotherms of water have also been measured at pressures up to 1000 MN m⁻² . Details of the viscometer and its pressurising equipment are given together with an analysis of the …
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An Experimental Study of Subcooled Flow Boiling at Elevated Pressure in an Annular Flow Channel
… to investigate the effects of liquid velocity, pressure, and temperature on the boiling heat transfer of subcooled fluid flowing through a heated annular channel. Water was used as the working fluid and principle of Ohmic heating was used to raise water temperature. The system pressure, heat …
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Investigation of electroactive ultrathin films by surface plasmon spectroscopy
… was combined with electrochemistry and high pressure technique to investigate ultrathin electroactive polymer films. Firstly, the electropolymerization of 2, 2a??-bithiophene was investigated by electrochemical surface plasmon spectroscopy. The anion doping and dedoping were monitored during …
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Numerical investigation of effects of pressure and chemistry on characteristics of turbulent premixed flames
… studies characterize TCIs at atmospheric pressure, but relevant devices usually operate at higher pressures. This study investigates the effects of elevated pressure and finite-rate chemistry on methane/air turbulent premixed flames using direct numerical simulations performed at pressures …
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Is my eye okay with OK lens?: comparative in vitro study depicting the effects of Orthokeratology (OK) lens treatment on the physiology of human corneal epithelial cells
… physiochemical changes imposed by OK treatment – elevated pressure and hypoxia, on the physiological responses of cultured human corneal epithelial cells (HCEC). HCECs were adapted and grown in keratinocyte serum-free media to 70 - 80% confluency and then were exposed to hypoxia alone (8% O2), …
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Arterial Wall Hypertrophy and PDGF-A Expression in One-Kidney, One-Clip Hypertension and Angiotensin II Infusion Are Mediated By Elevated Arterial Pressure
… relative roles of angiotensin II (ANG II) and pressure in the structural alterations that occur in experimental hypertension. Two separate studies were performed in order to differentiate these two mechanisms. First, male Wistar rats were subjected to one-kidney, one-clip (1K1C) hypertension or …
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Flame-flow interaction during premixed and stratified swirl flame flashback in an annular swirl combustor
… These flashback experiments are conducted at pressures ranging from 1 to 5 atm. To understand the flame-flow interaction physics, I developed a novel analysis methodology for low-turbulence fully-premixed methane-air swirl flame flashback, by stacking the planar flame profiles and …
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Laser-induced incandescence for soot diagnostics at high pressure
… focuses on laser-induced incandescence (LII) at elevated pressure. LII is a laser-based technique for measuring particle sizes and volume fractions of nano-sized particles in aerosols. These particles, as emitted by traffic in the form of soot, cause a significant health risk, as nano-sized …
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In situ High Pressure and Temperature 13C NMR for the Study of Carbonation Reactions of CO2
… [MgO, Mg(OH)2, and Mg2SiO4] at several different pressures: 1-200 bar) and temperatures: 25-150C) have been studied using a novel, elevated pressure and temperature 13C NMR probe. Critical observations about reaction rates, chemical exchange, and pH measurements throughout these reactions and the …
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Effect of Carbon Monoxide-Releasing Molecule-3 on the Severity of Endothelial Dysfunction Due to Elevation of Hydrostatic Pressure in an In Vitro Model of Compartment Syndrome
… syndrome (CS) is a surgical emergency caused by elevated pressure within a closed osseofascial compartment. It leads to microvascular dysfunction, limiting oxygen and nutrient delivery, gas exchange, resulting in cellular anoxia, muscle necrosis and cell death. Currently, the only effective …
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Large eddy simulations of hydrogen/methane jets in crossflows under engine-relevant conditions
… in these flows, especially under practical high-pressure conditions, remains limited. Moreover, the transitional development of hydrogen-methane blends introduces additional complexity in flame behaviour, fuel-air mixing, and pollutant formation, particularly when combustion occurs over a broad …
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The flow structure under mixed convection in a uniformly heated vertical pipe
… cooling using natural circulation of a gas at an elevated pressure is being considered. Since GFR cores have high power density and low thermal inertia, relative to the high temperature gas-cooled thermal reactor (HTGR), the decay heat removal (DHR) in depressurization accidents is a major …
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Studies of liquid-liquid phase transition and critical phenomena in supercooled confined water by neutron scattering
… of a liquid-liquid critical point at an elevated pressure.
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Microwave digestion methods for preparation of platinum ore samples for Icp analysis
… used with aqua regia in closed vessel provides elevated pressure and rapid heating which significantly reduce digestion time. All analyses were carried out by inductively coupled plasma atomic-emission spectroscopy (ICP-AES). To reduce matrix interferences during analysis, a predigestion step …
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Rotary bed reactor for chemical-looping combustion with carbon capture
… conductivity. Gas flows through the reactor at elevated pressure and it is heated from 823K to 1245K by fuel combustion. The rotary reactor design for a thermal capacity of 1MW has been performed using a simplified model that was developed to predict the performances of the reactor. Preliminary …
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High-pressure compliant syntactic foam for hydraulic noise control
Pressure fluctuations within a hydraulic system, commonly known as noise, create problems, such as leaks and breakout noise, within the system and necessitate treatment. Prior work has demonstrated the effectiveness of a flow-through expansion chamber with a syntactic foam liner; the device is …
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Continuous Co-Separation by Liquid Absorption in Aqueous Cuprous Chloride (CuCl) and Magnesium Chloride (MgCl2) Solution
… in the literature. The absorption takes place at elevated pressure (30 psig) and ambient temperature, and the stripping occurs at approximately 75 ºC. Using the apparatus at approximate design conditions, the highest removal of CO was 88% with a product composition of 48%. The highest product …
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High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps
… to 213,000. The measurements included mean wall pressure, single and 2 point wall pressure fluctuations, single and 2 point velocity fluctuations and, oil flow visualization. Pressure fluctuation measurements were made 5 boundary layer thicknesses upstream of step to 22 boundary layer thickness …
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Modeling and validation of a syntactic foam lining for noise control devices for fluid power systems
… compliance in these devices, especially at elevated pressures, is through a liner made of syntactic foam, which in this case is a urethane host matrix with embedded hollow, polymer microspheres. The material properties at elevated pressure are unknown by the liner manufacturer, but are known …
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Altered GABA ergic system in the posterior hypothalamus of the spontaneously hypertensive rat
… an increase in sympathetic discharge, arterial pressure and heart rate. It has been proposed that a deficit in this inhibitory system may be responsible for the elevated pressure in the spontaneously hypertensive rat (SHR), a useful animal model for studying human essential hypertension. The …
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