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 9 of 9 for “"Asymptotic techniques"”.
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A Method for Combining Integral Equation and Asymptotic Techniques for Solving Electromagnetic Scattering Problems
Made available in DSpace on 2014-12-12T20:54:29Z (GMT). No. of bitstreams: 1 7709056.pdf: 5887100 bytes, checksum: 160cf43da3bc0fee986dcd7bd05f3aa4 (MD5) Previous issue date: 1976
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Theory and applications of chirality in microstrip antennas
… for the full-wave Green's function. By using asymptotic techniques, the far-field electric field is found for an elemental point dipole source. The theory is directly applicable to radiation from a printed circuit antenna having a chiral substrate. Current research efforts show that under …
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Studies on counterflow diffusion flames
… reaction. The general Large-activation-energy asymptotic theory for diffusion flames is first revised and then applied to one dimensional counterflow diffusion flames with finite separation distance between reactant supplies under constant density assumption. Comparisons are made between …
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Spectral-Domain Iterative Techniques for Analyzing Electromagnetic Scattering From Arbitrary Bodies
… (moment method) and high-frequency (asymptotic techniques) regimes. The intermediate, or resonant, frequency range has been analyzed by combinations of these two approaches or by separation of variables, when possible. This work is devoted to the development of an independent …
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Acoustic scattering by discontinuities in waveguides
… is analyzed using the Method of Matched Asymptotic Expansions (MAE). Existing theories are accurate only for very low frequencies. In contrast, the theory developed in this thesis is valid over the entire range of frequencies up to the first cutoff frequency. The key to this improvement …
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Rough Surface Scattering and Propagation over Rough Terrain in Ducting Environments
… an initial field distribution, using marching techniques such as the split-step Fourier algorithm. As is obvious from the assumption on which it is based, the accuracy of the PWE approximation deteriorates in situations involving appreciable scattering away from the near-forward direction, i.e. …
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Analysis in Fractional Calculus and Asymptotics Related to Zeta Functions
… the mathematical theory remains incomplete. Many techniques for partial differential equations (PDEs) can be extended to fractional PDEs too. Three chapters below cover my results in this area: establishing the elliptic regularity theorem, Malgrange-Ehrenpreis theorem, and unified transform method …
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Modelling the spreading and draining of viscous films
… slender geometry of the films is exploited using asymptotic techniques to simplify the models. In the introductory chapter, the motivating float glass manufacturing process is described, then the mathematical techniques and modelling assumptions that are used throughout the thesis are introduced. …
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Mathematical modeling of membrane filtration
… blocking of entire pores by large particles. Asymptotic techniques are used based on the small pleat aspect ratio to solve the model, and solutions are compared to those for the closest-equivalent unpleated filter. In the third and fourth chapters, mathematical models are proposed to describe …