Spelling suggestions: "subject:"hightemperature"" "subject:"hightemperature""
101 |
Design and implementation of high temperature superconducting (HTS) tape RF coil and cryostat for MRI applicationsWong, Yum-wing. January 2006 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
|
102 |
Maximum element temperature for Kanthal Super 1800S in flowing nitrogen atmosphere with low content of oxygenPersson, Petter January 2010 (has links)
<p><strong>Abstract</strong></p><p>The behavior for MoSi<sub>2</sub> based high temperature heating elements for resistive heating has been examined in elevated temperature and low oxygen content environment. MoSi<sub>2</sub> spontaneously forms a protective SiO<sub>2</sub> scale at high temperature if the amount of oxygen in the ambient atmosphere is sufficient according to the following reaction:</p><p>5MoSi<sub>2</sub> + 7O<sub>2</sub>(g) 7SiO<sub>2</sub> + Mo<sub>5</sub>Si<sub>3</sub></p><p>If the oxygen content at a specific temperature is too low, SiO(g) is more stable than SiO<sub>2</sub> and the following reaction will occur instead:</p><p>2SiO<sub>2</sub> 2SiO(g) + O<sub>2</sub>(g)</p><p>Then surface will be Si-deplated and finally, the base material will be exposed. Si and Mo will oxidize and degas from the surface as SiO and MoO<sub>3</sub> with severe diameter reduction of the heating element as a result. It is therefore of high interest to find the relationship between the maximum element temperature and the oxygen content in the ambient atmosphere to be able to fully exploit the potential of the heating elements and also to aid and help diagnose customer complaints.</p><p> </p><p>After 14 full scale tests in a custom made atmospheric furnace, the following equation could be calculated:</p><p>p(O<sub>2</sub>) = 1.748·10<sup>0.01677·T·log(e)-10</sup></p><p>The equation gives the minimum oxygen content at a specified temperature. The equation is based on 100 hours tests at atmospheric pressure, gas flow rate of 4 liter per minute, varying temperature and varying oxygen content. Nitrogen has been used as carrier gas for the oxygen.</p>
|
103 |
Magnetization study of thallium-based layered superconductorsMoret, Eric J. M. 01 October 1999 (has links)
Graduation date: 2000
|
104 |
Perturbed angular correlation spectoscopy in the high temperature superconducting material YBa₂Cu₃0₇(subscript-x)Schwenker, Rainer 03 December 1990 (has links)
Graduation date: 1991
|
105 |
Processing, Characterization and Modeling Carbon Nanotube Modified Interfaces in Hybrid Polymer Matrix CompositesTruong, Hieu 1990- 14 March 2013 (has links)
Multifunctional hybrid composites are proposed as novel solutions to meet the demands in various industrial applications ranging from aerospace to biomedicine. The combination of carbon fibers and/or fabric, metal foil and carbon nanotubes are utilized to develop such composites. This study focuses on processing of and fracture toughness characterization of the carbon fiber reinforced polymer matrix composites (PMC) and the CNT modified interface between PMC and a metal foil. The laminate fabrication process using H-VARTM, and the mode I interlaminar fracture toughness via double cantilever beam (DCB) tests at both room temperature and high temperature are conducted. The cross-sections and fracture surfaces of the panels are characterized using optical and scanning electron microscopes to verify the existence of CNTs at the interface before and after fracture tests. The experimental results reveal that CNT’s improve bonding at the hybrid interfaces. Computational models are developed to assist the interpretation of experimental results and further investigate damage modes. In this work, analytical solutions to compute the total strain energy release rate as well as mode I and mode II strain energy release rates of asymmetric configurations layups are utilized. Finite element models are developed in which the virtual crack closure technique is adopted to calculate strain energy release rates and investigate the degree and effect of mode-mixity. Results from analytical solutions agree well with each other and with results obtained from finite element models.
|
106 |
Theory of macroscopic quantum tunneling in high-T_c c-axis Josephson junctionsYokoyama, Takehito, Kawabata, Shiro, Kato, Takeo, Tanaka, Yukio 10 1900 (has links)
No description available.
|
107 |
High Temperature Deformation Behaviour of an Al-Mg-Si-Cu Alloy and Its Relation to the Microstructural CharacteristicsCarrick, Roger Nicol January 2009 (has links)
The microstructural evolution and mechanical properties at elevated temperatures of a recently fabricated fine-grained AA6xxx aluminium sheet were evaluated and compared to the commercially fabricated sheet of the same alloy in the T4P condition. The behaviour of the fine-grained and T4P sheets was compared at elevated temperatures between 350°C and 550°C, as well as room temperature. Static exposure to elevated temperatures revealed that the precipitate structure of the fine-grained material did not change extensively. The T4P material, however, underwent extensive growth of precipitates, including a large amount of grain boundary precipitation. At room temperature, the T4P material deformed at much higher stresses than the FG material, but achieved lower elongations. Deformation at elevated temperatures revealed that the fine-grained material achieved significantly larger elongations to failure than the T4P material in the temperature range of 350°C-450°C. Both materials behaved similarly at 500°C and 550°C. Above 500°C, the grain size was greatly reduced in the T4P material, and only a slightly increased in the fine-grained material. At temperatures above 450°C, the elongation to failure in both materials generally increased with increasing strain-rate. The poor performance of the T4P material at low temperatures was attributed to the precipitate characteristics of the sheet, which lead to elevated stresses and increased cavitation. The deformation mechanism of both materials was found to be controlled by dislocation climb, accommodated by the self diffusion of aluminium at 500°C and 550°C. The deformation mechanism in the fine-grained material transitioned to power law breakdown at lower temperatures. At 350°C to 450°C, the T4P material behaved similarly to a particle hardened material with an internal stress created by the precipitates. The reduction in grain size of the T4P material after deformation at 500°C and 550°C was suggested to be caused by dynamic recovery/recrystallization. The role of a finer grain-size in the deformation behaviour at elevated temperatures was mainly related to enhanced diffusion through grain boundaries. The differences in the behaviour of the two materials were mainly attributed to the difference in the precipitation characteristics of the materials.
|
108 |
Maximum element temperature for Kanthal Super 1800S in flowing nitrogen atmosphere with low content of oxygenPersson, Petter January 2010 (has links)
Abstract The behavior for MoSi2 based high temperature heating elements for resistive heating has been examined in elevated temperature and low oxygen content environment. MoSi2 spontaneously forms a protective SiO2 scale at high temperature if the amount of oxygen in the ambient atmosphere is sufficient according to the following reaction: 5MoSi2 + 7O2(g) 7SiO2 + Mo5Si3 If the oxygen content at a specific temperature is too low, SiO(g) is more stable than SiO2 and the following reaction will occur instead: 2SiO2 2SiO(g) + O2(g) Then surface will be Si-deplated and finally, the base material will be exposed. Si and Mo will oxidize and degas from the surface as SiO and MoO3 with severe diameter reduction of the heating element as a result. It is therefore of high interest to find the relationship between the maximum element temperature and the oxygen content in the ambient atmosphere to be able to fully exploit the potential of the heating elements and also to aid and help diagnose customer complaints. After 14 full scale tests in a custom made atmospheric furnace, the following equation could be calculated: p(O2) = 1.748·100.01677·T·log(e)-10 The equation gives the minimum oxygen content at a specified temperature. The equation is based on 100 hours tests at atmospheric pressure, gas flow rate of 4 liter per minute, varying temperature and varying oxygen content. Nitrogen has been used as carrier gas for the oxygen.
|
109 |
High Temperature Deformation Behaviour of an Al-Mg-Si-Cu Alloy and Its Relation to the Microstructural CharacteristicsCarrick, Roger Nicol January 2009 (has links)
The microstructural evolution and mechanical properties at elevated temperatures of a recently fabricated fine-grained AA6xxx aluminium sheet were evaluated and compared to the commercially fabricated sheet of the same alloy in the T4P condition. The behaviour of the fine-grained and T4P sheets was compared at elevated temperatures between 350°C and 550°C, as well as room temperature. Static exposure to elevated temperatures revealed that the precipitate structure of the fine-grained material did not change extensively. The T4P material, however, underwent extensive growth of precipitates, including a large amount of grain boundary precipitation. At room temperature, the T4P material deformed at much higher stresses than the FG material, but achieved lower elongations. Deformation at elevated temperatures revealed that the fine-grained material achieved significantly larger elongations to failure than the T4P material in the temperature range of 350°C-450°C. Both materials behaved similarly at 500°C and 550°C. Above 500°C, the grain size was greatly reduced in the T4P material, and only a slightly increased in the fine-grained material. At temperatures above 450°C, the elongation to failure in both materials generally increased with increasing strain-rate. The poor performance of the T4P material at low temperatures was attributed to the precipitate characteristics of the sheet, which lead to elevated stresses and increased cavitation. The deformation mechanism of both materials was found to be controlled by dislocation climb, accommodated by the self diffusion of aluminium at 500°C and 550°C. The deformation mechanism in the fine-grained material transitioned to power law breakdown at lower temperatures. At 350°C to 450°C, the T4P material behaved similarly to a particle hardened material with an internal stress created by the precipitates. The reduction in grain size of the T4P material after deformation at 500°C and 550°C was suggested to be caused by dynamic recovery/recrystallization. The role of a finer grain-size in the deformation behaviour at elevated temperatures was mainly related to enhanced diffusion through grain boundaries. The differences in the behaviour of the two materials were mainly attributed to the difference in the precipitation characteristics of the materials.
|
110 |
Investigation on the effects of ultra-high pressure and temperature on the rheological properties of oil-based drilling fluidsIbeh, Chijioke Stanley 15 May 2009 (has links)
Designing a fit-for-purpose drilling fluid for high-pressure, high-temperature (HP/HT)
operations is one of the greatest technological challenges facing the oil and gas industry
today. Typically, a drilling fluid is subjected to increasing temperature and pressure with
depth. While higher temperature decreases the drilling fluid’s viscosity due to thermal
expansion, increased pressure increases its viscosity by compression. Under these
extreme conditions, well control issues become more complicated and can easily be
masked by methane and hydrogen sulfide solubility in oil-base fluids frequently used in
HP/HT operations. Also current logging tools are at best not reliable since the
anticipated bottom-hole temperature is often well above their operating limit. The
Literature shows limited experimental data on drilling fluid properties beyond 350°F and
20,000 psig. The practice of extrapolation of fluid properties at some moderate level to
extreme-HP/HT (XHP/HT) conditions is obsolete and could result in significant
inaccuracies in hydraulics models.
This research is focused on developing a methodology for testing drilling fluids at
XHP/HT conditions using an automated viscometer. This state-of-the-art viscometer is
capable of accurately measuring drilling fluids properties up to 600°F and 40,000 psig. A
series of factorial experiments were performed on typical XHP/HT oil-based drilling
fluids to investigate their change in rheology at these extreme conditions (200 to 600°F and 15,000 to 40,000 psig). Detailed statistical analyses involving: analysis of variance,
hypothesis testing, evaluation of residuals and multiple linear regression are
implemented using data from the laboratory experiments.
I have developed the FluidStats program as an effective statistical tool for characterizing
drilling fluids at XHP/HT conditions using factorial experiments. Results from the
experiments show that different drilling fluids disintegrate at different temperatures
depending on their composition (i.e. weighting agent, additives, oil/water ratio etc). The
combined pressure-temperature effect on viscosity is complex. At high thresholds, the
temperature effect is observed to be more dominant while the pressure effect is more
pronounced at low temperatures.
This research is vital because statistics show that well control incident rates for non-
HP/HT wells range between 4% to 5% whereas for HP/HT wells, it is as high as 100%
to 200%. It is pertinent to note that over 50% of the world’s proven oil and gas reserves
lie below 14,000 ft subsea according to the Minerals Management Service (MMS). Thus
drilling in HP/HT environment is fast becoming a common place especially in the Gulf
of Mexico (GOM) where HP/HT resistant drilling fluids are increasingly being used to
ensure safe and successful operations.
|
Page generated in 0.0648 seconds