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 91 for “"Thermal Gradients"”.
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Thermal gradients and water transfer in unsaturated soil.
… the flux of soil water under the influence of a thermal gradient was conducted in closed soil systems in the laboratory. A thermal gradient was imposed across the sandy loam soil columns and measured continuously for the duration of the experiment. The movement of soil water was monitored …
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Dynamics of molecular adsorbates exposed to ultrafast thermal gradients
Energy transfer concerned with how thermal energy is transported at molecular-length scales is a relatively new area and the physics governing this process are not yet well established. The experiments presented here represent initial steps toward developing a better understanding how thermal …
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A multi-scale generalized finite element method for sharp, transient thermal gradients
… heat transfer problems exhibiting sharp thermal gradients are analyzed using the generalized finite element method. Convergence studies show that low order (linear and quadratic) elements require strongly refined meshes for acceptable accuracy. The high mesh density leads to small …
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Thermal Gradients in Southwestern United States and the Effect on Bridge Bearing Loads
Thermal gradients became a component of bridge design after soffit cracking in prestressed concrete bridges was attributed to nonlinear temperature distribution through the depth of the bridge. While the effect of thermal gradient on stress distributions has been previously investigated in concrete …
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Detection of DNA polymorphisms in thermal gradients via a scanning laser confocal system
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Response of restrained steel beams subjected to fire inducted thermal gradients : by Mahmoud M.S. Dwaikat
Thesis (Ph. D.)--Michigan State University. Department of Civil Engineering, 2010
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Generation of acoustic-gravity waves in ionospheric HF heating experiments : simulating large-scale natural heat sources
… layer. The main hypothesis is that, the thermal gradients associated with the heat wave fronts could act as a source of powerful AGW capable of triggering ionospheric plasma turbulence over extensive areas. In our investigations, first we are going to examine a case study of the summer …
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Collapse behaviour of steel columns in fire.
… element method which includes the effect of thermal gradients over the member cross-section. The method is compared with test data on both uniformly and non-uniformly heated columns. This shows a good correlation between the method and experiment. Parametric studies have been carried out to …
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Thermo-mechanical stress relief analysis in PMMA and 6000 series aluminum
… process. The most common kinds are either thermal or mechanical and are commonly applied to commercial metal alloys. A third type, thermo-mechanical, utilizes thermal gradients to induce residual stresses of an equal and opposite nature to balance compressive and tensile stresses existing …
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Discipline-Based Planetary Education Research and Computational Fluid Dynamics Analysis of Mars
… Multiphysics 5.1, to investigate whether or not thermal gradients in a Mars-sized planet could cause vigorous upper mantle convection, consistent with plate tectonic processes. Results from this project indicated that stable convection could occur in the interior of a Mars-like planet assuming …
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Piezometry and Strain Rate Estimates Along Mid-Crustal Shear Zones
… petrofabric thermometers indicate steep apparent thermal gradients (80–420 °C/km) across 0.5–2.3 km thick sample transects across each shear zone. Quartz recrystallization microstructures evolve from transitional bulging/sub-grain rotation to dominant grain boundary migration at ~ 200 m structural …
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Cellular mimics within lipid vesicles and in thermal out-of-equilibrium chambers
… out-of-equilibrium cellular mimics generated by thermal gradients that do not rely on compartments made from lipid membranes.
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Microscopic Forces and Flows due to Temperature Gradients
… is unlike transport on the macro-scale. Pressure gradients typically dominate effects on a large scale while thermal gradients contribute negligibly to the motion of fluid. The situation entirely reverses on the nano-scale. At a microscopic level, flows induced by thermal gradients are caused by …
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Thermal Effects on Spin Currents in Non-Local Metallic Spin Valves
… favorable scalability. Recent studies have shown thermal effects created by high current densities play a significant role in the response of NLSVs. These thermal effects also provide the opportunity to create a pure spin current from thermal gradients via a mechanism call the spin dependent …
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Novel Method for Mach-Zehnder Interferometer Phase Stabilization
… of the relative phase between its arms as thermal gradients and vibrations can cause this phase to drift. This thesis proposes a novel method for MZI phase stabilization. The stabilization method was modelled mathematically and simulated, and a low cost and simple prototype control circuit …
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Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts
… buoyancy forces, which are induced by thermal gradients, are also authenticated. The accurate prediction of turbulent flows is sensitive to the level of turbulence predicted by the turbulence scheme. By treating the regions of interest in LES mode, DES allows the unsteadiness in these …
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A thermally-driven design methodology for large-scale polymer additive manufacturing systems
… in large-scale extrusion processes, as the large thermal gradients induce residual stresses that can overcome weak inter-layer welds, causing warping and cracking [2].
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Catalytic Membrane Reactor for Extraction of Hydrogen from Bioethanol Reforming
… material challenges including embrittlement, thermal degradation and poisoning by hydrocarbons when used for high-temperature hydrocarbon reforming. Thus, the present work is motivated by an interest in employing reactor design concepts to alleviate our reliance upon permselective materials. …
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Three-Dimensional Finite Element Analysis of Multilayered Systems: Comprehensive Nonlinear Analysis of Rigid Airport Pavement Systems
… interaction effects, stress magnification under thermal gradients, and the load transfer mechanism between adjacent concrete slab segments, are discussed in this dissertation.
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Nondestructive evaluation of reinforced concrete via infrared thermography: a feasibility study
… of utilizing artificial heating methods for thermal input prior to inspection was evaluated. The present study suggests that infrared thermography cannot be applied to substructural elements of bridges in a noncontact fashion. Internal thermal gradients produced by diurnal temperature …
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