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 24 for “"Surface Defect"”.
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Bridge Pier Surface Defect Detection Based on Improved YOLOV9
This research introduces an innovative surface defect detection methodology specifically designed for bridge piers, which integrates state-of-the-art image enhancement algorithms with sophisticated target detection frameworks. This hybrid approach effectively addresses some of the inherent …
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A Wavelet-Based Rail Surface Defect Prediction and Detection Algorithm
Early detection of rail defects is necessary for preventing derailments and costly damage to the train and railway infrastructure. A rail surface flaw can quickly propagate from a small fracture to a broken rail after only a few train cars have passed over it. Rail defect detection is typically …
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Leveraging Retrieval-Augmented Generation, Prompt Engineering, and Vision Language Models for Surface Defect Classification and Root Cause Analysis in Manufacturing
… prompt-engineering strategies to enhance surface defect classification and Root Cause Analysis (RCA) in manufacturing. The research examines whether generative and multimodal Artificial Intelligence (AI) systems can deliver accurate, explainable, and cost efficient quality control for …
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Classification on real-time videos of galvanized steel surface defect using support vector machines and convolutional neural network, based on data created by generative adversarial networks
… explores the use of video images to identify surface defects on galvanized steel tubes in real-time during production. To meet the criteria of accuracy, robustness, and speed, a conventional Support Vector Machine was first tested, and proved to be moderately accurate at 91% and …
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Unmanned Aerial Vehicle (UAV) navigation and image processing techniques for underground tunnel infrastructure assessment
… assessment. The Proximity Move-Pause-Photo for Surface Defect Inspection (PMPP-SDI) methodology is a technique for UAV tunnel inspection. The method uses flexible flight routines to follow the tunnel lining, enabling comprehensive coverage of the tunnel surface. This real-time reactive control …
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Engineering Functional Defects in Oxides Using External Stimuli
… often depend strongly on the functional defects of various dimensionalities, such as vacancies, interfaces, and precipitates. Therefore, defect engineering lies at the heart of materials innovations for the next-generation technologies. However, due to the enormous span in the length …
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Modelling visual search for surface defects
… been done on developing algorithms for automated surface defect detection. However, comparisons between these models and human perception are rarely carried out. This thesis aims to investigate how well human observers can nd defects in textured surfaces, over a wide range of task di culties. …
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Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques
… HIPIMS deposited coatings can suffer from some surface imperfections even though the overall number of defects can be significantly lower compared to, for example, arc deposited coatings of similar thickness. Defects can degrade the coating performance thus any kind of defect is undesirable. To …
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Robotic Inspection and Data Analytics to Localize and Visualize the Structural Defects of Civil Infrastructure
… environments. In addition to GPR, visual-based surface defect detection plays a crucial role in assessing and maintaining civil infrastructure. To facilitate deployment on a robotic platform and enhance inspection capabilities, the integration of GPR and visual-based sensors, such as RGB-D …
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Design and Development of 2d Functional Semiconductor Nanocrystals
… and optical response, due to their large surface-to-volume ratio and reactive planar surface increasing surface defect state formation or reactions with possible antagonistic substances, such as moisture or oxygen. Additionally, their large lateral surface area makes dopant incorporation …
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Sensor Fused Scene Reconstruction and Surface Inspection
… 3D reconstructions of environments. To detect surface faults, sub millimeter depth resolution is required to determine minute differences caused by coating loss and pitting. Sensors that can detect these small depth differences cannot quickly create contextual maps of large environments. To …
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Surface-mediated mechanisms for defect engineering in metal oxides
… and spatial distributions of solid point defects such as vacancies and interstitial atoms influence the performance of metal oxides in gas sensing, electronics, photonics and solar-induced photochemistry for fuel production and environmental cleanup. Controlling these aspects of defect …
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New strategies for application of defect engineering to TiO2 based photocatalytic materials
… through the application of principles related to defect engineering. Specifically, TiO2 has already demonstrated promise as a catalytic material for environmental remediation by photocatalysis in aqueous media as well as water splitting for hydrogen fuel production by photo/electrocatalysis. There …
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Ultrahigh resolution surface phononics
… This thesis mainly focuses on the measurement of surface phonons using the helium spin echo (HeSE) technique. In Chapter 1, the concept of phonons is introduced. An overview of phonon measurement techniques is also presented, followed by a more detailed introduction of HeSE. Since the energy …
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Controlling properties of functional oxides by tuning oxygen defect chemistry
Oxygen defects are essential building blocks for properties and functionalities of oxides, including electrical conductivity, magnetism, ferroelectricity as well as catalytic and electrocatalytic activity. Therefore, fundamental understanding of how to tune the oxygen defect chemistry is essential …
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Kontūro atpažinimo metodų taikymas skersinei chromatinei aberacijai šalinti akies dugno vaizduose ir kelio dangos defektams atpažinti /
… are investigated for solving the problem of road surface defect recognition and lateral chromatic aberration in eye fundus images. The recognition of object contours in raster images is relevant in many practical fields: astronomy, meteorology, forensics, warfare, industry, engineering, medicine, …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… ranges. In this thesis, I investigate how the surface chemistry of CsPbBrxI3-x NC systems is affected by the polarity of the antisolvent used during purification. I find that higher polarity antisolvents result in an increase in the selective etching of surface iodides, resulting in a decrease …
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Polymeric Adsorption of Estrone from Water and Photocatalytic Degradation by Zinc Oxide
… of steroid estrogens have been detected in surface waters and ground waters as a result of inadequate treatment of those compounds in wastewater treatment facilities. The presence of unregulated steroid estrogens in water resources poses direct risks to exposed aquatic species and potential …
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Einfluss des endodontischen Aufbaus auf die Frakturfestigkeit avitaler Seitenzähne: Untere Molaren mit zweiflächigen Hartsubstanzdefekten
Ziel dieser Studie war es, den Einfluss verschiedener Arten von Stumpfaufbauten und Restaurationen auf die Frakturfestigkeiten avitaler Molaren mit zweiflächigen okklusal-distalen Defekten nach computergeführter Kausimulation zu untersuchen. <br>Aus extrahierten menschlichen kariesfreien …
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