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 17 of 17 for “"grain-to-grain"”.
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Porosity in Oolitic Limestones
In oolitic limestones the individual grains are microporous, and the microporosity consists of irregular equant pores 1-3 (mu)m in size which are located between the rhombic to anhedral carbonate crystals which make up the ooid cortex. These equant micropores are locally constricted to plates or …
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Saponin Removal from Quinoa by Abrasion Processing
… combination of abrasion and turbulent water flow to remove saponin. This study will address the following research question: How will grain-to-grain and grain-to-surface abrasion affect the processing time to remove saponin from quinoa? In particular, can effective saponin removal be achieved in …
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Stress Transmission in a Granular System
… These external loads are propagated through grain-to-grain contacts. Consequently, the grains are being subjected to both tensile and compressive stresses according to their shape, position, and number of contacts. Thus, the nonlinear mechanical behaviour of soil may be described by …
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An analytic solution for magnetization distribution in multigrain ferromagnetic materials in an applied magnetic field
… by the variation in anisotropy direction from grain to grain as well as the changes in ferromagnetic parameters at grain boundaries and other defect regions. For example, transmission electron microscopy results show that chromium segregation occurs at the grand boundaries in CoCrTa films, …
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Static stress distribution in tall cylindrical bins filled with pseudosolid grains
… of the horizontal and vertical stresses in the grain mass and on the walls of storage bins has continued for some time. This ratio is commonly referred to as the K ratio. Four different experimental methods were used to determine K in a model cylindrical bin. At rest, measurements inside the …
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The development and application of microanalytical (U-Th)/He thermochronology
The (U-Th)/He thermochronmeter is the foremost tool available to geoscientists for the purposes of constraining the thermal evolution of the crust below 250°C. However, the potential of the technique is far from fully explored. The existing de facto (U-Th)/He age standard, the fluorapatite of Cerro …
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Tailored Mechanical Response of 3D Microgranular Crystals with Hierarchical Architecture
… extraordinary impact-mitigating properties due to their nonlinear grain-to-grain interactions, enabling efficient energy dissipation and wave perturbation under dynamic loading—behaviors unattainable in conventional monolithic materials. Recent efforts have sought to engineer granular systems …
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High temperature deformation mechanisms and strain heterogeneities in calcite rocks
… processes. Despite extensive field and laboratory investigation, many questions remain concerning the mechanical behavior of these rocks. For example, the mechanical behavior of different limestones and marbles differ greatly, possibly owing to the presence of chemical impurities or …
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Investigation of microstructural evolution by real-time SEM of high-temperature specimens.
This thesis presents the results of a project to investigate the growth of grains and movement of grain boundaries in face centred cubic metals, using Environmental Scanning Electron Microscopy (ESEM).The original aim proved impractical without considerable modification to the microscope technique. …
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Deep sea seismic stratigraphy
… waves within deep-sea sediments are shown to be less reliable for the purposes of correlation than their counter-parts in shallow margin sequences. Similar surfaces, such as abrupt lithological changes and unconformities, in the two different realms are not neccessarily produced by the same …
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Intragranular Tungsten-Titanium Carbide Composite Ceramics via Gas-Solid Displacement Reactions
… nanoprecipitates located primarily within TiCy grains have been produced via sintering of intragranular nanocomposite powders produced via reaction processing-based techniques. This dissertation details the thermodynamic basis and applied kinetics of a processing scheme for fabricating …
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Mechanisms of Shear Zone Localization and Raman Thermobarometry in Spinel Peridotites from the Alpine Fault, New Zealand
… has evidence of dislocation creep with subgrains, recrystallized grains, undulose extinction and a lattice preferred orientation. These samples also show evidence of post deformation static grain growth with polygonal grains, 120° triple junctions, and euhedral grains within larger grains …
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Analysis of hydrodynamic drag forces acting on suspended fine particle in porous media
… fine particles and the moving fluid at Stokes limit. Historically, due to the complicated geometries of porous media, researchers have had to resort to simplifying assumptions to conceptualize the underlying physics. However, the advent of high performance computing, in recent decades, …
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Deformation mechanics of quartz at a single asperity under hydrothermal conditions
… consolidation rates and deformation in the mid to upper crust. The process involves dissolution at asperities under load; diffusion along grain-to-grain contacts; and precipitation in the pore space. The kinetics of the process and the identity of the rate-limiting step in quartzose rocks are …
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Strain in Halide Perovskites: Characterisation, Crystallography, Consequences
Optoelectronic devices such as solar cells, LEDs, and X-ray detectors making use of halide perovskites as the light absorbing or emitting material have experienced a dramatic increase in efficiency in recent years. As a result, halide perovskite-based solar cells are now starting to make their way …
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Petrological and geochemical studies of an abyssal periodotite from the Atlantis II fracture zone
… peridotite with a crosscutting coarse-grained clinopyroxenite vein. One of the alteration veinlets contains rutile and ilmenite in association with plagioclase and amphibole. This veinlet is not related to the pyroxenite vein. In tenns of mineralogy, the composition of the major …
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Sintering techniques for microstructure control in ceramics
<p>Sintering techniques can be manipulated to enhance densification in difficult to sinter materials and to produce property enhancing microstructures. However, the interplay between materials, sintering techniques, and end properties is not fully understood in many material systems, and some …