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 29 for “"thermal instability"”.
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Magneto-thermal Instability in Dilute Magnetized Plasmas
… classic Schwarzschild criterion) via the magneto-thermal instability (MTI) and generates turbulence. The MTI is relevant in the outskirts of galaxy clusters, where it may supply a source of observed turbulence in the intra-cluster medium (ICM), and in the plasma of hot accretion flows around black …
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The Thermal Instability of a Deuterium-Tritium Tokamak Plasma
Made available in DSpace on 2017-07-06T18:59:12Z (GMT). No. of bitstreams: 2 Tsoukalas_Lefteris_H_MS.pdf: 18563901 bytes, checksum: 8290d8fe39ba1949fe6bffb2b07e5016 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1983
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Synchronous Thermal Instability Evaluation of Medium Speed Turbocharger Rotor-Bearing Systems
… shear in the bearing's lubricant film. This thermal gradient leads to bending of the shaft in a phenomenon known as The Morton Effect. Such thermally induced bending causes further growth of the elliptical orbit resulting in further bending leading to excessive vibration levels and premature …
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Catastrophic cooling in solar coronal loops : thermal instability as a road to complex evolution
… heated around their footpoints can develop a thermal instability in the upper part of the loop. This instability results in a self-amplifying “catastrophic cooling” process and leads to the formation of dense, cool plasma condensations. The first part of the work focuses on plasma …
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Global simulations of heat-flux-driven buoyancy and magnetothermal instabilities, and their astrophysical implications
… conducting plasma. We simulate the magneto-thermal instability (MTI), and the heat-flux-driven buoyancy instability (HBI) in two- and three- dimensional, global hydrodynamic simulations performed by the AREPO code, and verify the results of previous works. Our results have important …
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Reactions of Organonitrogen Compounds With Unsaturated and Lightly-Stabilized Osmium Carbonyl Clusters
… which would otherwise not be isolable, due to thermal instability at the temperatures required to labilize Os(,3)(CO)(,12).
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Magnetically torqued thin accretion disks
… solutions. We show that there are indications of thermal instability in some of the disk solutions, especially for the higher values of 3M. We also explain how the time evolution of the disk solutions can be calculated.
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Structural study of electrochemically induced adsorption and diffusion of metal surfaces
… the adsorbate diffuses across the surface due to thermal instability which causes difficulties in imaging. This problem can be overcome by lowering the temperature of the substrate. We have built a variable temperature STM, capable of operating at liquid helium temperatures. Initial results show …
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Role of bit patterned media in future of hard disk drives
… density of hard disk drives will be limited by thermal instability of the thin film medium and is estimated to be limited to about 500Gb/in2. Patterned media, in which data are stored in an array of single.domain magnetic particles, have been suggested as a means to overcome this limitation and …
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Molecular Engineering of Self-Assembled and Mechanically Robust Polymer Solar Cells
… silicon-based solar cells, (ii) the long-term thermal instability of polymeric emulsions and (iii) poor mechanical stability. In this thesis, we propose to study polymers, block copolymers, chemical additives, and polymer composites used in the bulk-heterojunction organic photovoltaics solar …
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An investigation into the biocatalytic application of the thermostable nitrile hydratase from the thermophilic strain Geobacillus pallidus RAPc8
… processes has been restricted in part by the thermal instability of the mesophilic-derived enzymes, and thus there is an increased focus on NHases from thermophilic microorganisms. A novel moderately thermophilic microorganism, Geobacillus pallidus RAPc8, was isolated by our collaborators …
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A Thermoelastohydrodynamic Model of The Morton Effect Operating in Overhung Rotors Supported by Plain or Tilting Pad Journal Bearings
… Morton Effect is a synchronous phenomenon. This thermal instability occurs primarily in overhung rotors that are supported by fluid film bearings and is caused by differential viscous shearing within the bearing lubricant. The Morton Effect has also gained much attention within the last decade. …
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Application of an Ionic Liquid Column to the Analysis of Flavor and Fragrance Ingredients
… fragrance analysis particularly in regards to thermal instability at high temperatures, degradation when exposed to water, unchanging selectivity, and relatively short shelf lives. Recently, capillary columns using ionic liquids as stationary phases have become available. Ionic liquid columns …
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Turbulence and structure formation in the interstellar medium
… physical processes such as turbulence, gravity, thermal processes, magnetic fields and cosmic rays which determine the modes of molecular cloud and star formation, and which in turn, define the global galactic properties. In this thesis, we have examined in detail the role played by thermal and …
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Extrusion foaming of bioplastics for lightweight structure in food packaging
… tensile strength, ductility, melt viscosity, thermal stability and high materials cost. The physical, mechanical, thermal, and rheological properties of the pure PHBV were studied systematically first to lay a solid foundation for formulation development. The influence of blending with other …
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Self assembly of block copolymers : applicability in microelectronics and gains for patterned media
… been proposed as an alternative to surpass this thermal instability criterion. In patterned media, lithographically defined nano-scale magnetic elements form single bits onto which the data is stored. Due to its unique structure in which each magnetic dots act as a single magnetic domain it can …
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Dipole Contact Engineering for Field-Effect Transistors Based on Two-Dimensional Materials
… Bi and Sb, however these materials suffer from thermal instability. This thesis addresses these challenges by (1) exploring the ultimate limit of contact metal workfunction scaling to better understand the metal-MoS₂ interface, and (2) introducing a new method of reducing contact resistance to …
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