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 95 for “"Surface Defects"”.
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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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Reflectance map techniques for analyzing surface defects in metal castings
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Detection of surface defects in infrastructure using wavelets and neural networks
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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Automated Detection of Surface Defects on Barked Hardwood Logs and Stems Using 3-D Laser Scanned Data
… algorithm that identifies severe external defects on the surfaces of barked hardwood logs and stems. The defects detected are at least 0.5 inch in height and at least 3 inches in diameter, which are severe, medium to large in size, and have external surface rises. Hundreds of real log …
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Material flow and microstructure evolution in friction stir welding of AA6111 alloy sheets
… material flow during FSW, the faying surfaces in FSLPs are deposited in and around the weld nugget and create unavoidable defects. These defects reduce the load carrying thickness of the joints by providing an easy path for the weld failure. Therefore, to control the faying surface …
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The study of organic crystals by atomic force microscopy
… of organic crystals, the study of their surfaces is crucial, as several reactions occur at the interface between the crystal surface and its immediate environment. While atomic force microscopy (AFM) is a useful tool for studying surfaces, it is not a common technique for studying organic …
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Water Management Diagnostics of a Proton Exchange Membrane Fuel Cell Using Magnetic Resonance Imaging
A final finding is that surface defects in the flow field impact the water distribution pattern. To the author's knowledge, this is the first time the importance of flow field surface quality is considered, and its impact is found to be profound. In our system we find that defects act as 'sticking' …
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Quality Monitoring of 3D Printed Scaffold
… from the ideal printing parameters can lead to defects and substandard products. However, an adequate quality monitoring method can adequately avail for early detection and correction of such deviations during the printing process, resulting in higher quality products and increased efficiency. …
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Applying the DER rating system for the visual assessment of defects on concrete dams
… when it comes to the visual assessment of surface defects on the dam elements. This may result in varying assessment outcomes from different individuals based on their differences in training and experience. The DER rating system used for the rating of defects on road structures, as input …
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Breakdown in high voltage, high energy density multilayer ceramic capacitors
… capacitors was 96 +/- 13 MPa. Failure was due to surface defects or pores close to the surfaces of the samples. The dielectric breakdown strength of the samples was 181 kV/cm. The causes of breakdown were either field enhancements due to electrode end effects or pores between the dielectric and …
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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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Addressing equipment set-up time and manufacturing cost through real time inline inspection in tantalum wire manufacturing
… wire inspection system was developed to detect surface defects and monitor diameter real-time during the final wire drawing operation. Throughout his work, it was proven that the new inspection system was able to catch common wire defects under manufacturing conditions (wire speed). Furthermore, …
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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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Colour comparison of two composite materials to natural tooth structure: an in vitro study
… were selected which were caries free, had no surface defects and within the colour range A3, B3, C3 or D2. The teeth were randomly divided into four colour groups (A3, B3, C3 and D2), each containing 14 teeth. A class IV cavity was prepared on all the teeth and the two composite materials were …
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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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Development of technical bases for using infrared thermography for nondestructive evaluation of fiber reinforced polymer composites bonded to concrete
… and reliable method to detect and characterize defects at the substrate interface and within multi-ply systems. Infrared thermography is well suited for this purpose because it is inherently sensitive to the presence of near-surface defects and can interrogate large areas efficiently. Before …
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Development of Low Expansion Glaze Coatings on As Fired Si₃N₄ to Enhance Room Temperature Flexural Strength
… various high-performance applications. However, surface defects such as voids/pits are commonly present on as processed Si₃N₄. When subjected to external forces, fracture originates at such flaws. To reduce or eliminate surface flaws, machining operations are required which constitute a major …
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Quantitative HPTLC
… found to have some plates with obvious visual surface defects that were not suitable for use. The major source of variation for all manufacturers was the plate to plate variation rather than track to track deviations on any given plate.
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