Wong Wan Yan = 光學中消光截面佯謬之解釋 / 黃蘊殷. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 58-60). / Text in English; abstracts in English and Chinese. / Wong Wan Yan = Guang xue zhong xiao guang jie mian yang miu zhi jie shi / Huang Yunyin. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Scattering of a Plane Wave by an Infinitely Long Cylinder --- p.4 / Chapter 2.1 --- Dielectric cylinder (with no absorption) --- p.8 / Chapter 2.2 --- Perfectly conducting cylinder --- p.10 / Chapter 3 --- Scattering of a Gaussian Beam by a Dielectric Cylinder (Non- Resonance) --- p.13 / Chapter 3.1 --- Configuration and equations used --- p.13 / Chapter 3.2 --- Numerical result and discussion --- p.17 / Chapter 3.2.1 --- a <w --- p.19 / Chapter 3.2.2 --- a>w --- p.21 / Chapter 4 --- Scattering of a Gaussian Beam by a Dielectric Cylinder (Res- onance) --- p.24 / Chapter 4.1 --- Algorithm --- p.26 / Chapter 4.2 --- Numerical result and discussion --- p.28 / Chapter 5 --- Scattering of a Plane Wave by a Conducting Strip --- p.33 / Chapter 5.1 --- Configaration and equations used --- p.34 / Chapter 5.2 --- Numerical calculation --- p.39 / Chapter 5.3 --- Numerical results and discussion --- p.42 / Chapter 6 --- Actual Scattering Cross Section --- p.49 / Chapter 6.1 --- Configaration and Equations used --- p.49 / Chapter 6.2 --- Numerical result and disscusions --- p.51 / Chapter 7 --- Conclusions --- p.56 / Bibliography --- p.58 / Chapter A --- Bessel functions --- p.61 / Chapter B --- A plane wave incident on a single-layered medium --- p.63

This thesis studies a spin-star model and an open spin-star model. The spin-star model is exactly solvable, and the approximation methods can be applied and compared with the exact solution. As this model is shown to be non-Gaussian and non-Markovian, Born-Markovian approximation is not valid. The comparison of Nakajima-Zwanzig and time-convolutionless methods show that the performances of those two techniques depend on the specific property of the model. The open spin-star model is not exactly solvable and the analytical solution under Gaussian approximation is obtained.

Thesis (M.S.)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 22, 2008) Includes bibliographical references.

Thesis--Ph. D., University of Hong Kong, 1985.

published_or_final_version / Electrical Engineering / Doctoral / Doctor of Philosophy

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In the 3-dimensional curved N-body problem, the new concept of rotopulsating orbits is defined. This type of solution is used when the bodies rotate and change size during the motion. Considering the possibility of having these bodies in spaces of positive or negative curvature, it is feasible to use the following classification: positive elliptic, positive elliptic-elliptic, negative elliptic, negative hyperbolic, and negative elliptic-hyperbolic. The necessary and sufficient criteria for the existence of rotopulsators are provided. Results will be obtained that describe their qualitative behavior, which will then be applied to find examples for each type of rotopulsating orbits. / Graduate / 0280 / shimak@uvic.ca

This thesis studies a spin-star model and an open spin-star model. The spin-star model is exactly solvable, and the approximation methods can be applied and compared with the exact solution. As this model is shown to be non-Gaussian and non-Markovian, Born-Markovian approximation is not valid. The comparison of Nakajima-Zwanzig and time-convolutionless methods show that the performances of those two techniques depend on the specific property of the model. The open spin-star model is not exactly solvable and the analytical solution under Gaussian approximation is obtained.