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 74 for “"xray"”.
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Xray Generation by Field Emission
Since the discovery of X-rays over a century ago the techniques applied to the engineering of X-ray sources have remained relatively unchanged. From the inception of thermionic electron sources, which, due to simplicity of fabrication, remain central to almost all X-ray applications at this time, …
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Computational design of a novel soft-Xray-based turbulence diagnostic in NSTX-U
Turbulence transport poses a significant challenge in fusion research. The measurement of turbulent fluctuations is critical for comprehending turbulence transport, predicting its behavior, and ultimately controlling it to maximize fusion gain. However, there is a notable scarcity electron …
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Improving Model Generalization of Pneumonia Detection from Chest Xray Images Using Deep Learning and Transfer Learning
… in pneumonia detection using chest Xray images. Publicly available datasets, including the COVID-19 Radiography Database and the Chest X-ray (COVID-19 & Pneumonia) dataset, were merged, pre-processed, and balanced prior to training. Model optimization involved freezing and unfreezing …
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Depozice tenkých polymerních vrstev v povrchovém DBD výboji
… elektronové mikroskopie s EDX (Energy-Dispersive Xray Spectroscopy) detektorem a jejich povrchová energie pomocí metody měření kontaktních úhlů.
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Structure and conformations of heteropolysaccharides
… adopted by hyaluronate have been studied by Xray diffraction techniques. A four-fold helical structure having a fibre repeat of 3.39 nm is the more readily obtained form. Initial computer model building studies showed that a double helical structure was one interpretation of the data. …
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LET dependence of radiation-induced bystander effects using human prostate tumor cells
… bystander cells after either alpha particle or xray irradiation of the DU-145 target cells. A 1.5-fold [gamma]-H2AX bystander increase and a survival fraction reduction to 80% were only detected in AGO1522 cells, and only after xray irradiation of target DU-145 cells. Alpha particle irradiation …
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Retrograde melting in transition metal-silicon systems : thermodynamic modeling, experimental verification, and potential application
… out into liquid droplets. Synchrotron-based Xray Absorption Microspectroscopy measurements provide experimental confirmation of such phase transitions and the underlying thermodynamics. Finally, the potential for using retrograde melting to improve the electronic minority carrier lifetime of …
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Hydrodynamic Modeling for Autonomous Underwater Vehicles Using Computational and Semi-Empirical Methods
… thesis focuses on are two gliders (Slocum and XRay/Liberdade), and a third vehicle, the Virginia Tech Miniature autonomous underwater vehicle.
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Electronic Stucture of Elemental Boron
… point of view. Also calculated are the Xray Absorption Near Edge Structure (XANES) spectra which can provide information about the relationship between atomic structure and electronic structure. The calculated XANES spectra of α-B12 agrees with experimental data in terms of peak …
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Structure and decomposition of diol inclusion compounds
… scanning calorimetry, hotstage microscopy and Xray powder diffraction. The kinetics of decomposition of the inclusion compound containing the guest cyclohexanone were studied using different experimental techniques under isothermal conditions: these were the quartz microbalance, the levitating …
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Resolving the Mysteries of Highly Irradiated Planets: Observations and Simulations
… temperatures and/or through high energy FUV/Xray radiation. The resulting planets exhibit a diverse array of physical characteristics unlike those seen on Earth. I present a collection of works broadly encompassed by the theme of understanding highly irradiated planets and a set of new …
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Designing, constructing, and testing an X-ray polarimeter
… field since its birth 50 years ago. However, Xray polarization measurements have been almost non-existent, especially when compared to the amount of polarimetry being performed in the other bands of the spectrum. One method of filtering a specific energy of polarized X-rays involves reflecting …
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Noncollective X-Ray Thomson Scattering Diagnostic Development Based On A Titanium Hybrid X-Pinch X-Ray Source
… source. The arguments are supported through xray diode and image plate photometric analysis for the titanium He[alpha] feature. As a proof of principle, scattering signals from cold, static materials have been collected using the hybrid x-pinch as the probe source. Two different experimental …
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Proof-of-Concept For Converging Beam Small Animal Irradiator
… customize a collimator geometry for this unique Xray</p> <p>source to simultaneously maximize the irradiator’s intensity and precision. Then, a full</p> <p>converging beam irradiator apparatus was fit with a multitude of these X-ray tubes in a</p> <p>spherical array and designed to deliver …
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Characterization of Residual Mineral Content of Bauxite Stockpiles in Saline County, Arkansas: An XRD Analysis Approach
… (ALCOA) Saline County bauxite mine, using Xray Diffraction (XRD) on 25 samples to characterize mineral phases and compare them with preliminary X-ray fluorescence (XRF) data. Gibbsite and kaolinite dominate the mineralogy, with gibbsite showing strong positive correlations with zirconium (r …
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Hybrid ConVIRT - enhancing medical image-text representation learning of vision language models
… text encoder, specifically tailored for chest Xray reports. To optimize feature alignment, it introduces a Fused Similarity Matrix (FSM), which serves as a more refined target, leveraging the learned capabilities of Med-CLIP and ConVIRT. Evaluation across four datasets (COVID, Tuberculosis, …
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Analytical studies of the degradation of cellulose nitrate artefacts
… was carried out, using ion chromatography, xray fluorescence spectroscopy and atomic absorption spectroscopy, to identify compositional differences between samples, which may relate to degradation. The results of these studies suggested that residual sulphate in the plastics is a cause of …
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A continuum surface layer effect in polycrystalline aggregates
… the bulk yield paint. Above this stress, the xray stress is noticeably less than expected. Upon unloading, there is a substantial acquired compressive residual stress. Because the x-ray diffraction measurements provided average stress values in a surface layer of only a few grain diameters, …
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Oxidation addition of H-H bonds to iridium: developing novel active water soluble catalysts for hydrogenation of unsaturates
… NMR spectroscopy, CH analysis and single crystal xray diffraction. <b>(2)</b> reacted with the strong sigma donor PMe₃ to form [IrH2(PMe₃)4]CI <b>(3b)</b> without having to remove the chloride ligand. <b>(2)</b> reacted with monosubstituted acetylenes and an internal diyne in water to form the …
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Lead Free CH3NH3SNI3 Perovskite Thin-Film with P-type Semiconducting Nature and Metal-like Conductivity
… and characterized using various tools such as Xray Diffraction (XRD) and absorption spectroscopy (UV-VIS). The distinctive p-type semiconducting nature and metal like conductivity of CH3NH3SnI3 were confirmed by the measurements of electrical and optical properties. Crystal structures and …
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