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 31 for “"Optical images."”.
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Optical imaging with machine learning for the automated characterization of micro- and nanoscale devices
… associated with enhancing the sensitivity of the optical images in nanotechnology. First, the dissertation presents a novel interpretable machine learning technique for defect detection and classification in noisy optical images of semiconductor wafer die. This solution is designed to solve the …
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A Framework for Assessing Lower-Bound Bearing Capacity of Sandy Coastal Sediments from Remotely Sensed Imagery
… satellite-based data. For this study, both optical and synthetic aperture radar (SAR) images were collected at two sites: the Atlantic beach near the US Army Corps of Engineers Field Research Facility in Duck, North Carolina and three distinct sites located near Yakutat, Alaska (Cannon …
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ESSAYS ON OPTIMIZATION AND SUPPLY CHAIN STRATEGIES FOR SUSTAINABLE SYSTEMS: INSIGHTS FROM FRACTAL DIMENSION IMAGE ANALYSIS, PHOTOVOLTAIC MANUFACTURING RESILIENCE, AND FRESH PRODUCE INFRASTRUCTURE
… error in fractal-dimension (FD) measurement from optical images, improving the fidelity of micro- to mesoscale structure quantification; (ii) a prospective life-cycle and systems analysis of reshoring crystalline-silicon photovoltaic (PV) manufacturing to the U.S., linking resilience with …
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IGFEM modeling of transverse failure in carbon-epoxy composites and implementation of the IGFEM in Abaqus FEA
… virtual microstructures is created from optical images of test specimens and was simulated to study the effects of microstrucutural geometric characteristics on the onset of initial cracking. Finally, a linear IGFEM formulation was implemented in the commercial finite element analysis …
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Image Classification and Initial Orbit Determination of Resident Space Objects (RSO)
… and potential collisions in Earth’s orbit. Optical imagers, based in both ground and space, serve as important tools for observing, detecting, and studying resident space objects (RSOs). Optical imagers capture vast amounts of data that can be used for different applications in SSA research. …
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Expansion microscopy : improving imaging through uniform tissue expansion
Until the past decade, optical microscopy of biological specimens was strongly limited by diffraction and scattering, affecting imaging resolution and depth, respectively. Now, numerous methods are available to overcome each of these limitations, but sub-diffraction limited resolution imaging over …
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Advanced modelling and analysis for quality assessment and enhancement of underwater multimodal imageries.
… challenges, multimodal sensing, which integrates optical and acoustic imaging, has been widely adopted. Despite its advantages, modality-specific degradations persist, resulting in low-quality data. This thesis introduces novel image quality assessment and enhancement techniques tailored for …
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Aufbau eines magnetooptischen Rasternahfeldmikroskops im Reflexionsmodus und Test an periodischen Mikrostrukturen und magnetooptischen Speichermedien
… storage media. The scanning near-field optical microscope (SNOM) enhances the diffraction-limited resolution of a conventional microscope. In this work a magneto-optical SNOM, which can measure the Faraday and Kerr rotation of transparent respective opaque samples quantitatively with …
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Propagation, Scattering and Amplification of Surface Plasmons in Thin Silver Films
… electrons, have a strong influence on the optical properties of metal micro- and nanostructures and are of great interest for novel photonic devices. Here, plasmons on metal-dielectric interfaces are investigated using near-field optical microscopy and differential angular reflectance …
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The dual development of an optical tomographic scanner and three dimensional gel dosimeter for complex radiotherapy verification
… the dual development and assessment of an optical tomographic scanner and normoxic gel dosimeter. MRI centers are currently limited in both time and resources in providing the routine imaging necessary for treatment verification. An alternative bench top imaging modality has been designed, …
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Strategies for the Characterization and Virtual Testing of SLM 316L Stainless Steel
… features from scanning electron microscopy (SEM) images with an instance segmentation accuracy nearly identical to that of a human researcher, but about four orders of magnitude faster. The defect segmentation tool uses techniques from the OpenCV Python library to identify and segment defect …
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Fabrication of multifunctional nanocomposites using functionalized carbon nanofibers
… fiber layers. For polymeric nanocomposites, optical images of the nanocomposites revealed uniform distribution and alignment of the CNFs in the direction of the electric field. Due to the similarity in the alignment morphology, it was observed that alignment structure of the functionalized …
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A model for generating object-based change information from multi-temporal remotely-sensed imagery
… efficient algorithms for interpretation of these images. This thesis describes the development of a conceptual framework for the iterative processing of fine spatial resolution optical images. It consists of two central components, object detection and object comparison.<br/><br/>In the object …
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Optical spectroscopic studies of two star forming regions
… and determine the star-forming history. Optical spectroscopic surveys of an unbiased sample of candidate young stars have been completed. Optical images taken in different photometric bands were used to create color-magnitude diagrams from which sources were selected for spectroscopic …
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Microscale strain accumulation during fatigue and fracture of additively manufactured Ti-6Al-4V
… manufactured annealed Ti-6Al-4V samples. Optical images of the microstructure were recorded after these samples had been heat tinted in a laboratory oven. Using a modified single edge notch tension geometry, the samples were fatigue precracked then subjected to monotonic loading, followed …
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Learning Clinical Body Composition Metrics from 2D and 3D Optical Imaging
… osteoporosis. Estimates of body composition from optically measured human body geometry are cheap, safe, and non-invasive relative to current reference methods that require exposure to ionizing radiation.In this thesis, I present a body of work that thoroughly investigates predicting body …
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Picosecond Infrared Lasers (PIRL): Applications in Biodiagnostics and Towards Quantitative Mass Spectrometry
… Laser Desorption/Ionization (MALDI). Molecular images using PIR-LAESI for both plant and animal tissues could be collected directly and matched to optical images of the same region. The image quality was compared to nanosecond LAESI versions. Smaller crater size with PIR-LAESI was noted with …
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Methods and algorithms for quantitative analysis of metallomic images to assess traumatic brain injury
… methods for quantitative analysis of macroscopic optical images and fluorescent images are described. The secondary aim of this thesis focuses on developing methods for a novel application of metallomic imaging mass spectrometry (MIMS) to biological tissue. Unlike traditional modalities used to …
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Mechanisms for triggering high-voltage breakdown in vacuum
The electrical and optical characteristics of a cylindrical alumina insulator (94% Al203) have been measured under ultra-high vacuum (P < 10-8 mBar) conditions. A high-resolution CCD camera was used to make real-time optical recordings of DC prebreakdown luminescence from the ceramic, under …
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