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 33 for “"X-ray micro-computed tomography"”.
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X-ray Micro-Computed Tomography and Deep Learning Segmentation of Progressive Damage in Hierarchical Nanoengineered Carbon Fiber Composites
Advanced composite laminates comprised of carbon (micro) fiber reinforced polymer (CFRP) have become widespread in modern high-performance aerospace structures, providing high, tailorable mass-specific stiffness and strength. However, while underpinning such performance benefits, CFRP …
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A geometric study of liquid retention in open-cell metal foams
… dip tests and geometrical classification via X-ray Micro-Computed Tomography. Aluminum open-cell metal foam samples of 5, 10, 20, and 40 pores per inch (PPI), all having a void fraction greater than 90%, were included in this investigation. In order to model the condensate retention behavior of …
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Microfluidic assembly and packing dynamics of colloidal granules
… granulation, high shear mixer granulation, and spray drying. However, none of these methods provide adequate control over these important parameters. In this thesis, we use microfluidic-based assembly methods to control granular size, shape, and chemical heterogeneity. We then investigate the …
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Kinematics of Inter-Ply Interfaces In Composite Manufacturing
… in the composite are further characterized by X-ray micro-computed tomography (micro-CT). A non-destructive method is developed to calculate residual stresses using DIC Strains in combination with temperature-dependent moduli obtained from Dynamic Mechanical Analysis (DMA) and Classical Laminate …
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Towards reliable correlation of microporous layer physical characteristics and PEMFC electrochemical performance
… it has been found that by including a cathode microporous layer (MPL) in the membrane electrode assembly (MEA) , performance under dry conditions (no external humidification) can be significantly improved . However, the precise function of the MPL is not well understood and therefore there is …
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Microstructural investigation of tablet compaction and tablet pharmacological properties
… hypothesized that the understanding of tablet microstructure is pivotal in bridging our knowledge about the materials, the manufacturing process, and the tablet properties. A series of X-ray micro computed tomography (microCT) characterization methods were developed to untangle material …
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Pharmaceutical tablet compaction : product and process design
… explores how tablet performance is affected by microstructure, and how microstructure can be controlled by selection of excipients and compaction parameters. A systematic strategy for formulation and process design of pharmaceutical tablets is proposed. A modified nanoindenter method was used to …
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Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw
… with quantification of phase volumes by X-ray micro-computed tomography (micro-CT); and (iii) the explanation of results by several pore scale mathematical and conceptual models. The two-dimensional cell experiments (using a monolayer of 0.5 mm diameter glass beads held between two glass …
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Brittle-viscous deformation cycles at the base of the seismogenic zone in the continental crust
… repository for nuclear waste. Combined microstructural analysis, electron backscatter diffraction (EBSD), and mineral chemistry were applied to reconstruct the variations in pressure, temperature, fluid pressure, and differential stress that mediated deformation and strain localization …
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Simulating complex conductivity in carbonate rocks: using digital carbonate rocks and comparison to laboratory measurements
Digital rock physics involves the modern microscopic imaging of geomaterials, digitalization of the microstructure, and numerical simulation of physical properties of rocks. This physics-based approach can give important insight into understanding properties of reservoir rocks, and help reveal the …
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Design of a multifunctional biomineralized armor system : the shell of chitons
… ventral side. In typical flat conformations, X-ray micro-computed tomography revealed that the shape and imbrication of the plates results in an overall continuous curvature and constant armor thickness. However, in defensive postures, vulnerable regions exist between the plates due to decreases …
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Trophic and Competitive Interactions among Egg Parasitoids of Stink Bugs
… coexistence assessed. Third, an L9 orthogonal array (OA) design was used to rank the influence of host egg mass parameters on parasitoid behaviour and development. Finally, the temporal pattern of parasitoid development in H. halys was examined using a DNA-based approach (PCR) and visualized by …
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Morphology of Acercaria: investigations of the ovipositor and internal anatomy
… (Goodchild 1966; Niven et al 2009). X-ray micro-computed tomography was used instead of conventional dissection for this task, which allowed for the 3-D visualization of these tissues with their natural placements and arrangements kept intact. These resulting images were found to align …
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Three dimensional characterization of failure evolution of tin and silicon in lithium ion battery electrodes
… three-dimensional (3D) imaging technique of X-ray micro-computed tomography (microCT) to gather detailed accounts of Sn/Si microstructural evolution, allowing the analysis and characterization of these host materials during the critical early cycles of lithiation/delithiation (i.e., the …
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Improved stabilization of 2-acetyl-1-pyrroline zinc chloride complex using spray chilling encapsulation and its practical application in foods
… stability of 2AP zinc halide complex by use of spray-chilling encapsulation, and to demonstrate the practical application of the stabilized microcapsules as flavoring agents in foods. First, the use of 2AP-ZnCl2 complex itself as a flavoring agent in instant rice was evaluated and high flavor …
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Biomineralized structural materials with functional optical properties
… indentations was performed via synchrotron X-ray micro-computed tomography, revealing the formation of a complex network of microcracks. A unique structural motif, screw dislocation-like connection centers, is identified to enable a high density of crack deflection and bridging. This thesis …
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Computer vision and texture analysis for characterization of X-ray images of rocks
X-ray micro-computed tomography (micro-CT) has provided us digital twins of physical rocks. Digital twins are raw grayscale micro-CT images that contain information regarding rock-microstructure. These raw micro-CT images are then transformed into their segmented counterparts, which attempt to …
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Multiscale modeling of transport mechanisms and quality changes in frozen foods during freeze-thaw cycles
… cycles. From the experimental aspect, the 3D microstructure of frozen potatoes was investigated by using an innovative high-resolution internal imaging method: X-ray micro-computed tomography (CT), to study the effect of temperature fluctuations on ice crystal growth/decay during freezing. The …
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Micro-computed tomography for interlaminar analysis, void quantification, and feature localization in carbon fiber composites
… fully leverage the relatively rich data within x-ray micro computed tomography ([mu]CT) datasets, two automated analysis tools have been developed which limit subjectivity compared to extant CT analysis of composites. The developed tools extract micron-scale morphological information in three …
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Factors controlling root growth in heterogeneous substrates: physical structures and root behaviour
… partially negated by using techniques such as X-ray micro-computed tomography, but is an expensive and time-consuming technique. Furthermore, soil is a growth medium prone to spatial and temporal variation in terms of water, nutrient availability, and microbial populations, making it difficult to …
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