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 28 for “"Micro computed tomography (Micro-CT)"”.
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Development of a Three-Dimensional Image-Guided Needle Positioning System for Small Animal Interventions
… needle positioning techniques for small animal microinjections are fraught with issues of repeatability and targeting accuracy. To improve the outcomes of these interventions a small animal needle positioning system guided by micro-computed tomography (micro-CT) imaging was developed. A phantom …
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Kinematics of Inter-Ply Interfaces In Composite Manufacturing
… induced residual stresses, which critically affect both the manufacturing processes and the deformation mechanisms. Processing induced residual stresses are often responsible for causing warping, delamination, and dimensional instability in composite structures. This research includes new in-situ …
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Age-Related Changes and Regional Variations in Three-Dimensional Microstructural Properties of Male Proximal Femoral Trabecular Bone
… to explore regional variations in the 3D microstructure of trabecular bone in human proximal femur, with respect to aging. Materials and Methods: A total of 162 trabecular bone cores were obtained from six regions (femoral head, superior and inferior regions of the neck, and …
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Dynamics of residual non-aqueous phase liquids in porous media subject to freeze-thaw
This project concerns the effect of freeze-thaw cycles on the pore-scale structure of nonaqueous phase liquid (NAPL) contaminants in water-saturated porous media. This problem is of critical importance to the entrapment of such contaminants in cold temperate, polar and high altitude regions, and …
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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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Fractals in mechanics of materials
Fractal concepts have been used in geometric characterizations as well as models of various material microstructures and deformation patterns. The first part of this dissertation studies fractal patterns of plastic regions observed in elastoplastic deformations. As a paradigm, we focus on a random …
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NEAR INFRARED SPECTROSCOPIC ASSESSMENT OF BONE WATER BINDING TO COLLAGEN AND MINERAL
… (BMD); however, studies have shown that other factors such as bone architecture, cell turnover and tissue composition influence bone quality. There is growing evidence that age related changes in bone water associated with collagen and/or mineral have a direct impact on bone mechanical competence …
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Scrimshaw: unlocking the cultural and biological archive of sea mammal art
… of industrial whaling ships. Scrimshaw collections represent a unique cultural and biological archive of pre-industrial/industrial sperm whale populations, but the rarity, collectability, and high value of genuine nineteenth century scrimshaw specimens have precluded meaningful scientific …
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Trophic and Competitive Interactions among Egg Parasitoids of Stink Bugs
The intra- and inter-trophic interactions in ecosystems can be disrupted by invasive species, with lasting effects on population dynamics of native organisms. An invasive species may be attractive as a prey or host to native species, but if unsuitable for consumption or for development of the …
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Characterization of alginate scaffolds using X-ray imaging techniques
… to use traditional methods, such as scanning electron microscopy (SEM) and light microscopy, and emerging X-ray imaging techniques, such as micro-computed tomography (micro-CT) and synchrotron radiation (SR) X-ray imaging, to characterize the alginate scaffolds. Firstly, the material properties …
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Taxonomic and palaeobiological assessment of the South African mosasaurids
… and globally. In addition, isotopic analyses, micro-computed tomography (micro-CT), mineralised tissue histology and scanning electron microscopy (SEM) are applied to the SA mosasaur remains to decipher various aspects of their palaeobiology. This study identifies three mosasaur taxa from SA: …
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Compressed Sensing based Micro-CT Methods and Applications
High-resolution micro computed tomography (micro-CT) offers 3D image resolution of 1 um for non-destructive evaluation of various samples. However, the micro-CT performance is limited by several factors. Primarily, scan time is extremely long, and sample dimension is restricted by the x-ray beam …
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Comparative Enamel Remineralization Using SDF, Fluoride Varnish, and Curodont™
Objectives: To compare the remineralization efficacy of 5% sodium fluoride varnish (FV), 38% silver diamine fluoride (SDF), and Curodont™ Repair on incipient enamel caries lesions in permanent teeth. Methods: Thirty-two enamel blocks were prepared from eight sound human permanent teeth. Artificial …
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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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Estimating Root Volumes by Limited Segmentation: A Volumetric Analysis of CBCT and Micro-CT Data
<p>Introduction: The increased dimensional accuracy of images provided by cone beam computed tomography (CBCT) scans allows for more in-depth diagnosis and treatment planning. Expedient interpolation of segmented data that provides clinically acceptable results will encourage clinicians to …
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Modeling and Prediction of Thermal Conductivity in Porous Media: Numerical Simulation, Data-Driven Approaches and Cross-Property Relationships
… the different thermal properties, thermal conductivity is one of the key parameters that has been widely investigated in the literature under various conditions. A precise evaluation of this variable can ensure the success of any industrial or lab-scale experiment and operation that involves …
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Evaluation of bone strength: microtomographic tecniques
… is a part of a larger study about the characterization of mechanical and histomorphometrical properties of bone. The main objects of this study were the bone tissue properties and its resistance to mechanical loads. Moreover, the knowledge about the equipment selected to carry out the …
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Structure-property relations of porcine trabecular bone and micro-CT imaging of various materials
This thesis addresses the characterization of materials with a focus on trabecular bone. In the first part, we aim to find relations between morphological measures of trabecular bone and its Young’s modulus and ultimate compressive strength. Previous research has showed that apparent density and …
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Permeability, Pore Body, and Pore Throat Size Distributions from 2D Image Analysis: Comparison with Results from 3D Imaging and Laboratory Measurements
… rock and fluid properties is essential for characterizing any petroleum bearing reservoir. Typically, this requires that core be acquired from the formation of interest. Core plug samples are then drilled for rock properties measurement. In order to cut costs, percussion sidewall core samples are …
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How did the Human Brain Evolve? Tracking Cerebral Changes in the Fossil Hominin Record Using Advanced Imaging Techniques and 3D Modelling
… of the hominin brain is critical for reconstructing the emergence of human cognitive abilities. However, given the lack of direct fossilised brain tissue, palaeoneurological studies rely on cranial endocasts, replicas of the internal surface of the braincase, to infer structural changes over …
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