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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Elucidation of the time scales of coherent structures in Newtonian turbulent channel flows through Karhunen-Loeve analysis

Oxberry, Geoffrey M.. January 2006 (has links)
Thesis (M.Ch.E.)--University of Delaware, 2006. / Principal faculty advisor: Antony N. Beris, Dept. of Chemical Engineering. Includes bibliographical references.
2

Geometry of nodal sets and domains for eigenfunctions of SchrÜdinger operators

Haldane, Evan. January 2008 (has links)
Perturbations of the Laplacian are known as Schrodinger operators. We pose a question about perturbations of eigenfunctions from multiple eigenspaces and answer the question in the case of the two-sphere. This is used to extend a previously known result about nodal sets of spherical harmonics to eigenfunctions of Schrodinger operators on the two-sphere. We also review some of the classical and recent results about nodal sets and domains for eigenfunctions of the Laplacian.
3

Eigensystem based techniques for blind channel estimation and equalization /

Fung, Carrson Chee-Ho. January 2005 (has links)
Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references. Also available in electronic version.
4

Geometry of nodal sets and domains for eigenfunctions of SchrÜdinger operators

Haldane, Evan. January 2008 (has links)
No description available.
5

A study on eigenfunctions and eigenvalues on surfaces /

Leung, Kin Kwan. January 2008 (has links)
Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 35-36). Also available in electronic version.
6

Synthesis of optimal arrays for MIMO and diversity systems /

Quist, Britton T., January 2006 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept of Electrical and Computer Engineering, 2006. / Includes bibliographical references (p. 59-60).
7

Some relationships between characteristic modes and Inagaki modes for use in scattering and radiation problems /

Liu, Duixian. January 1986 (has links)
Thesis (M.S.)--Ohio State University, 1986. / Includes bibliographical references (leaves 39-40). Available online via OhioLINK's ETD Center
8

Self-similar solution for a fractal drum

Roth, Axel January 1998 (has links)
No description available.
9

A Near-Zone to Far-Zone Transformation Process Utilizing a Formulated Eigenfunction Expansion of Spheroidal Wave-Harmonics

Ricciardi, Gerald F. 30 November 2000 (has links)
In the field of antenna design and analysis, often the need arises to numerically extrapolate the far-zone performance of a radiating structure from its known (or assumed known) near-zone electromagnetic field. Mathematical processes developed to accomplish such a task are known in the literature as near-zone to far-zone transformations (NZ-FZTs) as well as near-field far-field (NF-FF) transformations. These processes make use of sampled near-zone field quantities along some virtual surface, viz., the transformation surface, that surrounds the radiating structure of interest. Depending upon the application, samples of the required near-zone field quantities are supplied via analytical, empirical, or computational means. Over the years, a number of NZ-FZT processes have been developed to meet the demands of many applications. In short, their differences include, but are not limited to, the following: (1) the size and shape of the transformation surface, (2) the required near-zone field quantities and how they are sampled, (3) the computational methodology used, and (4) the imbedding of various application-driven features. Each process has its pros and cons depending upon its specific application as well as the type of radiation structure under consideration. In this dissertation we put forth a new and original NZ-FZT process that allows the transformation surface along which the near-zone is sampled to be spheroidal in shape: namely a prolate or oblate spheroid. Naturally, there are benefits gained in doing so. Our approach uses a formulated eigenfunction expansion of spheroidal wave-harmonics to develop two distinct, yet closely related, NZ-FZT algorithms for each type of spheroidal transformation surface. The process only requires knowledge of the E-field along the transformation surface and does not need the corresponding H-field. Given is a systematic exposition of the formulation, implementation, and verification of the newly developed NZ-FZT process. Accordingly, computer software is developed to implement both NZ-FZT algorithms. In the validation process, analytical and empirical radiation structures serve as computational benchmarks. Numerical models of both benchmark structures are created by integrating the software with a field solver, viz., a finite-difference time-domain (FDTD) code. Results of these computer models are compared with theoretical and empirical data to provide additional validation. / Ph. D.
10

Discrete Nodal Domain Theorems

18 May 2001 (has links)
No description available.

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