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Zhao, Y. (author)
As one of the most prominent examples of technology-enhanced learning, massive open online courses (MOOCs) have attracted extensive attention of learners, educators, and researchers since 2012. However, a low completion rate is a ubiquitous and severe problem in MOOCs, which means that only a small portion of learners got scores higher than or...
doctoral thesis 2019
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Zhao, T. (author)
The popularity of thermoplastic composites (TPCs) has been growing steadily in the last decades in the aircraft industry. This is not only because of their excellent material properties, but also owing to their fast and cost-effective manufacturing process. Fusion bonding, or welding, is a typical joining method for TPCs due to the intrinsic...
doctoral thesis 2018
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Zhao, Z. (author)
Correspondence theory originally arises as the study of the relation between modal formulas and first-order formulas interpreted over Kripke frames. We say that a modal formula and a first-order formula correspond to each other if they are valid on the same class of Kripke frames. Canonicity theory is closely related to correspondence theory. We...
doctoral thesis 2018
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Zhao, X. (author)
doctoral thesis 2016
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Zhao, G. (author)
Breaching is the most frequent form of embankment failure in the world. Due to overtopping, an embankment starts to breach when part of the embankment actually breaks away, leaving an opening for water to flood the land protected by the embankment. A breach can be a sudden or gradual failure that is caused by surface erosion and/or headcut...
doctoral thesis 2016
document
Zhao, J. (author)
Rail transportation plays an important role in our everyday life, and there is fast development and modernization in the railway industry to meet the growing demand for swifter, safer and more comfortable trains. At the same time, the security of train operation and the maintenance of rails have to be considered. A lot of research on these...
doctoral thesis 2015
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Zhao, Q. (author)
Fluorescence microscopy is a well-established platform for biology and biomedical research (Chapter 2). Based on this platform, fluorescence lifetime imaging microscopy (FLIM) has been developed to measure fluorescence lifetimes, which are independent of fluorophore concentration and excitation intensity and offer more information about the...
doctoral thesis 2014
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Zhao, Y. (author)
doctoral thesis 2013
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Zhao, X. (author)
Squats, as a kind of short wavelength rail surface defects, have become one of the main rolling contact fatigue problems in railways worldwide. The purpose of this work is to better understand the squatting phenomenon, contribute to reduction and even prevention of squat occurrence, and thereby reduce the related costs. To such an end, a new...
doctoral thesis 2012
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Zhao, J. (author)
doctoral thesis 2012
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Zhao, Z. (author)
doctoral thesis 2011
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Zhao, C. (author)
Understanding the fluid flow in weld pools contributes significantly toward controlling the heat distribution in the base material and the mass distribution of molten base and additive materials. Currently, most investigations focus primarily on numerical models, due to the experimental difficulties associated with the challenging environment in...
doctoral thesis 2011
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Zhao, L. (author)
In this thesis, we present an automatic polyp detection approach that integrates knowledge from flow visualization techniques. Our primary goal was to compute additional characteristic polyp features that improve the CAD performance of existing polyp detection approaches by eliminating found false-positive polyp candidates. We found that surface...
doctoral thesis 2011
document
Zhao, D. (author)
Power electronics applications are usually accompanied by high voltage and current amplitudes, and steep voltage and current transients. The EMI (Electromagnetic Interference) issue is regarded as the main side effect of power electronics applications. Noise level prediction is a vital task for filter design, but many difficulties are...
doctoral thesis 2009
document
Zhao, Y. (author)
doctoral thesis 2009
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