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 20 of 5141 for “"Spectral"”.
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Topics in spectral and inverse spectral theory
… major classes of operators and provides various spectral and inverse spectral results for them. In the first part of this work a special class of one-dimensional discrete unitary operators is under investigation. The underlying Weyl-Titchmarsh theory and a Borg-type inverse spectral result are …
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Spectral fingerprinting
… sources can be reliably identified based on spectral features (‘fingerprints’), whether (2) these spectral fingerprints permit the quantification of relative source contribution, and whether (3) in situ derived source information is sufficient for this purpose. Furthermore, sediment …
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Spectral Evidence
<p>My novel, <em>Spectral Evidence</em>, weaves together my interests in the history of witchcraft and reproductive rights, colonial New England and the modern media landscape, and the female lived experience past and present. The novel begins when a fledgling female journalist is assigned to …
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Hyper-Spectral Sensor Calibration Extrapolated from Multi-Spectral Measurements
Hyper-spectral (HS) sensors are the instruments of choice for remote sensing applications involving environmental monitoring, littoral survey, and military assessment. Accurate band-to-band sensor radiometric calibration is critical for successful data mining of such HS spectral sets. Current …
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Spectral estimation with spatio-spectral constraints for magnetic resonance spectroscopic imaging
… to acquire in vivo biochemical information, and spectral estimation (quantification) of MRSI data is an important step towards quantitative studies. Although a large body of work has been done on spectral estimation over the past decades, it remains challenging due to model nonlinearity and …
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A linear prediction approach to two-dimensional spectral factorization and spectral estimation.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Abstractions from Spectral Sonorities
… I deal primarily with issues relating to Spectral and Post- Spectral techniques in contemporary music. Potential limitations of Spectralism (as a genre) are taken into consideration, and several philosophical underpinnings of this compositional style are called into question as I consider …
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Spectral anonymization of data
… and computational efficiency. I use the term 'spectral anonymization' to refer to anonymizing in a spectral basis, such as the basis provided by the data's eigenvectors. Additionally, I propose new measures of reidentification and prediction risk that are more generally applicable and more …
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Spectral Integral Method and Spectral Element Method Domain Decomposition Method for Electromagnetic Field Analysis
<p>In this work, we proposed a spectral integral method (SIM)-spectral element method (SEM)- finite element method (FEM) domain decomposition method (DDM) for solving inhomogeneous multi-scale problems. The proposed SIM-SEM-FEM domain decomposition algorithm can efficiently handle problems with …
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Experiments on turbulent flows in rough pipes: spectral scaling laws and the spectral link
… proposed theory that entails the existence of a “spectral link” between the turbulent energy spectra and the attendant turbulent mean velocity profile in a pipe flow, we establish new scaling laws for the turbulent energy spectra of pipe flows. These new scaling laws— an inner scaling law and an …
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Automation of the Spectral-Line Imaging Camera for the Virginia Tech Spectral-Line Survey
The Virginia Tech Spectral-Line Survey (VTSS) is a high sensitivity, high resolution survey of Hydrogen-$\alpha$ and Sulfur-II emission in the full northern hemisphere. The instrument used for the survey is the Spectral Line Imaging Camera (SLIC). SLIC uses a fast(f/1.2) lens attached to a …
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Subset Selection via Spectral Objectives
… on four problems which can be modeled in the spectral subset selection framework. The first, is determinant maximization under matroid constraints. For this problem, in the case that we number of vectors we are selecting is exactly d, we provide a combinatorial O(d^d)-approximation algorithm …
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Shape Analysis Using Spectral Geometry
… geometric feature points in the Laplace-Beltrami spectral domain instead of traditional spatial domains. Simultaneously, the local shape descriptor of a feature point is the Laplace-Beltrami spectrum of the spatial region associated to the point, which are stable and distinctive. The salient …
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Zero Crossing Based Spectral Analysis
… signal processor simulator. Four methods of spectral analysis using zero crossing times are also reviewed and a practicable scheme using the same processor is devised. Spectral analysis of a reconstructed signal from zero crossings is shown to be the best of the methods tried.<br/><br/>The …
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Enhanced plasma wave spectral asymmetries
A strong high-frequency radio wave incident on the ionosphere is capable of exciting enhanced electron plasma waves via a parametric wave-plasma coupling interaction. Incoherent backscatter radar is used to obtain detailed power spectra of these enhanced plasma waves. Power and frequency …
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A p-adic spectral triple
<p>We construct a spectral triple for the C*-algebra of continuous functions on the space of <em>p</em>-adic integers. On the technical level we utilize a weighted rooted tree obtained from a coarse grained approximation of the space combined with the forward derivative <em>D</em> on the tree. Our …
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Spectral theory of linear operators
Abstract available p. i-iii
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Spectral analysis of neutral evolution
… In this work, we build on recent results from spectral graph theory and utilize numerical methods to enhance our understanding of how populations distribute themselves over neutral networks. We demonstrate that, in the presence of certain topological features, the population will undergo an …
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