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 “"Microtomography"”.
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Particulate composite material internal deformation measurements using x-ray microtomography and digital volume correlation
… coatings for turbine engines. In the past, X-ray microtomography (X-ray microCT) has been used to study the internal structure of such complex microstructures. The combination of the Digital Volume Correlation (DVC) method and the three-dimensional (3D) imaging X-ray microCT technique is becoming …
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Investigation of Microcrack Growth in [0/90]s Graphite Epoxy Composite Laminates Using X-Ray Microtomography
… levels. In this research work the use of X-Ray Microtomography has proven to be an excellent tool to characterize the crack connectivity and damage information three dimensionally. Dye penetrant technique was also used in this work to enhance the visibility of the cracks.
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Extraction of physically-realistic pore network properties from three-dimensional synchrotron microtomography images of unconsolidated porous media
… three-dimensional images using synchrotron microtomography. Morphological algorithms were developed to extract physically-realistic pore-network structure from unconsolidated porous media systems imaged using synchrotron microtomography. The structure can be used to correlate pore-scale …
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Characterisation of Ovine and Human Vertebral Endplates using X-ray Microtomography: the Effects of Degeneration on Structure.
Back pain is a significant and debilitating problem worldwide. It can be caused by several factors, but the cause of pain is only identified successfully in a minority of cases. There has been significant evidence indicating that the vertebral endplate (VEP) plays a major role in low back pain. The …
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QUANTIFICATION OF MELT DISTRIBUTION, MELT CONNECTIVITY, AND ANISOTROPIC PERMEABILITY OF DEFORMED PARTIALLY MOLTEN ROCKS USING X-RAY MICROTOMOGRAPHY
… laboratory, obtained using high-resolution x-ray microtomography (X-ray µCT), to investigate how the distribution of melt, its orientation, its connectivity, and its ability to flow through the rocks changes when stress is applied. This study shows how melt connectivity and, therefore, rock …
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Pore scale study of crude oil distribution and interfacial processes in unconsolidated porous media: an application of synchrotron x-ray microtomography
… solution in various episodes. Synchrotron X-ray microtomography (SXM) was used to obtain high-resolution 3-D images before and after each surfactant flooding event. Results show homogeneous distributions of light and heavy oil fractions, as residual saturation conditions, within the homogeneous …
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Irradiated recycled plastic as a concrete additive for improved chemo-mechanical properties in hardened cement pastes
… analysis -- consisting of XRD, SEM, and X-ray microtomography -- was performed. XRD analysis showed that various differences in C-S-H and C-A-S-H phase formation from the addition of both irradiated plastic and mineral additives helped to form high-density phases that contributed to higher …
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Patterns and Mechanisms of Melt Distribution in Partially Molten Harzburgite under Hydrostatic Pressure
… were recorded using synchrotron-based X-ray microtomography. In most samples the melt fraction increases along the axial direction of the sample, but the mineral phases exhibit no systematic heterogeneities. Analysis of time-series samples confirmed that the melt fraction heterogeneity was …
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Effect of stress on initiation and propagation of localized corrosion in alumninium alloys
… stressed conditions. In situ X-ray synchrotron microtomography experiments were used to observe the evolution of corrosion attack as a function of continuous exposure time in both unstressed and stressed AA2024. Quantitative growth rate measurements indicates that application of stresses of 70% …
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Experimental and computational analysis of random cylinder packings with applications
… were conducted on equilateral cylinders. X-ray microtomography was used to image the cylinder packs, and the particle-scale packings were reconstructed from the digital data. This numerical approach makes it possible to study detailed packing structure, packing density, the onset of ordering, …
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Quantification of short term interactions between soil and fungi
… The first part of the thesis merges X-ray microtomography, image analysis and laboratory measurements to investigate the impact of short term incubation of fungi on soil water retention and soil structure at macro (whole microcosm) and micro (individual aggregate) scales. Part Two …
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Controls on arsenic mobility in contaminated wetland and riverbed streams
… between As and Fe, as determined by XRF microtomography. Most As was adsorbed, likely to Fe hydroxides in the plaque.
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Synchrotron Based Infrared Microspectroscopy of Carbonaceous Chondrites.
… for these meteorites. Our infrared spectro-microtomography measurements on Murchison meteorite, representing the first such measurement on any kind of meteorite, comprise of three-dimensional reconstructions of specific molecular functional groups for understanding the spatial distributions …
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Fluoride Varnishes for Prevention and Treatment of Initial Dental Caries in Children Aged 3 to 6 Years //// Профилактика и лечение на началния дентален кариес с флуорни лакове в детска възраст от 3 до 6 години
… fluoride varnish through modern methods – SEM, microtomography and X-ray diffraction. To assess the effectiveness of remineralization of Clinpro White Varnish applied in case of reversible, active carious lesions and surfaces through diagnostics based on laser fluorescence. Preparation of a …
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How does cement influence the mechanical properties of sands and sandstones?
… of deformation bands.;Integrating x-ray microtomography (X-CT) with microscopic observations, the first part of this thesis analyses cement and porosity distribution across deformation band samples from Utah, Hungary and Arran by comparing 2D slice to 3D sub-volume analysis …
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Investigation of a heirarchical collagen scaffold/3D printed lattice structure designed for use in total knee replacements
… (PLA) and PEKK polymers were investigated. X-ray microtomography provided information on structural defects (including porosity) and tensile testing was used to investigate the relationships between printing parameters and the ultimate tensile strength (UTS) and modulus. The rasters of dumbbell …
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Relationships between material properties and microstructure-mechanical attributes of extruded biopolymeric foams
… This study utilizes non-invasive x-ray microtomography (XMT), in combination with mechanical testing and novel phase transition analysis techniques, to understand these complex relationships. The first part of this study provided significant insight into the deformation mechanism of …
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Recovery of crude oil from saturated porous media as a function of geochemistry and wetting-phase dynamics for multiple remediation flushing strategies
… enhanced-flushing conditions. Synchrotron X-ray microtomography (SXM) was used to perform pore-scale examination of NAPL fragmentation and changes in blob morphology, and recovery using three different advective flushing methods: surface-active agent (surfactant) flushing, alkaline flushing, and …
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Flow and Distribution of Water in Fractional Wettability Unsaturated Porous Media
… content experiments and computed x-ray microtomography (CMT) were used to obtain quantitative data describing drainage and the irreducible water distribution in fractionally-wet systems. The findings from this research showed that wettability and pore-size distribution affected the …
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