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 25 for “"x-ray 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 …
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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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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
… the 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 …
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Misalignment detection in X-ray microtomographic imaging system
X-ray microtomography becomes a promising and effective tool in various fields of internal structure studies on micrometer scale. Its resolution has been developed to reach a level far beyond the ability of a conventional medical tomography. Behind successful progressions, the quality of …
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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 …
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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 …
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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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How does cement influence the mechanical properties of sands and sandstones?
… formation 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 …
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Relationships between material properties and microstructure-mechanical attributes of extruded biopolymeric foams
… properties. 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, …
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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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Mechanical properties of energetic composites
… intergranular separations, were measured using X-ray microtomography. Quasi-static and SHPB compression experiments were performed. Particle size and separation were found to be secondary to fill-fraction in governing material properties. A Porter-Gould modulus decay function was fitted to the …
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Novel processing of porous bioceramic structures
… Modifications have been made to the electrospraying set–up configuration and a range of suspension concentrations have been utilised to determine the experimental conditions. Control of porosity, pore size and depth of penetration has been obtained by varying parameters such as spray time, …
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Hot spots in ammonium nitrate
… scanning electron microscopy (ESEM) and X-ray microtomography. Those intended for explosive use were found to be more porous than those intended for fertilizer use. The pores in explosive prills were also found to form a connected network. The elemental composition of pellets of mixed AN …
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Developing NMR/MRI Techniques for Characterisation of Reactive Transport in Porous Media
… where the majority of the fluid transfers to. X-ray microtomography is widely adopted to study this kind of systems, since it can provide information about the rock structure resolved at the micron-scale. This is usually coupled with numerical simulations in order to predict the behaviour of the …
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