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 123 for “"micro computed tomography"”.
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In vivo imaging of cortical porosity by synchrotron phase contrast micro computed tomography
… maintenance and senescence. The use of micro-computed tomography (µCT) on living animals is relatively new and allows the three dimensional quantification of change in trabecular bone microarchitecture over time. The use of in vivo µCT is limited by the radiation dose created by the …
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Micro-computed tomography for interlaminar analysis, void quantification, and feature localization in carbon fiber composites
… 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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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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Study of the microstructure and mechanical properties of hummingbird wing-bones
A study of the microstructural and mechanical properties of wing bones of an Anna's hummingbird (Calypte Anna) and a tree swallow (Tachycineta bicolor) was conducted to determine whether the hummingbird bones exhibited unique features due to the high wing loading of the bird. It was hypothesized …
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A geometric study of liquid retention in open-cell metal foams
… 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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Nanoindentation of copper covetics and the mechanical testing and microstructural imaging of additive manufactured Inconel 718
… the specimens were analyzed through the use of micro-computed tomography and scanning electron microscopy. The results of drop-weight impact tests showed that there was a significant drop in energy absorption once porosity is introduced into specimens. Uniaxial compressions showed similar …
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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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Investigation of Advanced Material Through Digital Volume Correlation Measurement Techniques
… composite structures. Through the utilization of micro-computed tomography datasets can be obtained and utilized to visualize three-dimensional dataset for DVC. This thesis explores the utilization of DVC for the analysis of composite materials. A methodology is developed based on artificially …
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Mechanically constrained stereotypy in agonid escape responses
… the length of adjacent lateral scales from micro-computed tomography (µCT) scans of bent and straight specimens. The resulting bent-to-straight length (BSL) ratio served as a proxy for lateral surface compression and closely matched the lateral length changes observed in C-start trials. …
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Changes in 3 Dimensional Microstructures of Subchondral Cancellous Bone of Distal Femur in Early Osteoarthritis
… out the relation between cartilage damage and microstructural changes of cancellous bone. MATERIALS & METHODS: Total of 52 trabecular bone cores were obtained from 4 parts of distal femur of 13 Korean cadaver donors. 6 donors had only grade 2 or 3 cartilage changes in distal part of medial …
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Microfluidic assembly and packing dynamics of colloidal granules
… important parameters. In this thesis, we use microfluidic-based assembly methods to control granular size, shape, and chemical heterogeneity. We then investigate the packing dynamics of non-spherical granular media using X-ray micro-computed tomography. Monodisperse spheroidal granules …
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Kinematics of Inter-Ply Interfaces In Composite Manufacturing
… 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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Reverse engineering nature : design principles for flexible protection inspired by ancient fish armor of Polypteridae
… and mathematical methods employed were micro-computed tomography, microscopy, morphometric analysis, and three-dimensional printing of prototypes. The geometrical design principles discovered were related to biomechanical mobility and protection and then implemented into a generalized, …
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The effect of Zoledronate treatment timing on lumbar and caudal vertebrae in ovariectomized rats
… with respect to their effects on bone microstructure and strength. This paper, then, investigates the effects of treatment timing using Zoledronate [ZOL], a potent bisphosphonate, on the lumbar and caudal vertebrae in ovariectomized [OVX], female Wistar rats. Methods: Twenty nine rats …
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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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Investigating Potential Therapies to Decrease the Rate of Cystine Stone Growth in Slc3a1-/- Mice
… the formation of cystine stones. For this study, micro-computed tomography (µCT) scanning was evaluated for its feasibility to track accurate volumetric measurements of in vivo cystine stone growth in the Slc3a1-/- cystinuric mouse model. Six pharmacological interventions – sulforaphane, methyl …
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Quantitative image analysis of in vivo microstructure and growth factor effects in hydroxyapatite bone scaffolds
… bone formation when combined with scaffolds. Microporosity (<20µm) has also been shown to influence bone regeneration in calcium phosphate (CaP) scaffolds. However, many studies use only the term “osteoconductive” to describe the effects of BMP-2 and microporosity on bone formation, and do not …
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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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