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Space-Dependent Nuclear Reactor Transient Analyses by Multiple Temporal-Mode TransformationTse, Kelvin 10 1900 (has links)
<p> A multiple temporal-mode transformation is applied to
the finite difference form of the space-dependent reactor
kinetics equations with the aim of reducing the truncation
error. The transformation method is incorporated into an
existing alternaing-direction explicit code and is tested
on three homogeneous problems in one and two dimenisions
as well as on a one-dimensional space-dependent CANDU-type
problem. The numerical results have confirmed some characteristics
of this solution formalism with respect to accuracy
and stability. In addition, this study has identified some
areas for improvement to the multiple temporal-mode trans-·
formation technique. </p> / Thesis / Master of Engineering (MEngr)
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Characterization and Cancellation of High-Frequency Parasitics for EMI Filters and Noise Separators in Power Electronics ApplicationsWang, Shuo 20 July 2005 (has links)
Five chapters of this dissertation concentrate on the characterization and cancellation of high frequency parasitic parameters in EMI filters. One chapter addresses the interaction between the power interconnects and the parasitic parameters in EMI filters. The last chapter addresses the characterization, evaluation and design of noise separators. Both theoretical and experimental analyses are applied to each topic.
This dissertation tries to explore several important issues related to EMI filters and noise separators. The author wishes to find some helpful approaches to benefit the understanding and design of EMI filters. The contributions of the dissertation can be summarized below:
1) Identification of mutual couplings and their effects on EMI filter performance
2) Extraction of mutual couplings using scattering parameters
3) Cancellation of mutual couplings to improve EMI filter performance
4) Cancellation of equivalent series inductance to improve capacitor performance
5) Analysis of mode transformations due to the imperfectly balanced parameters in EMI filters
6) Analysis of interaction between power interconnects and EMI filters on filter high-frequency performance
7) Modeling and design of high-performance noise separator for EMI diagnosis
8) Identification of the effects of parasitics in boost PFC inductor on DM noise
Although all topics are supported by both theory and experiments, there may still be some mistakes in the dissertation. The author welcomes any advice and comments. Please send them via email to shuowang@ieee.org. Thanks / Ph. D.
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