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 372 for “"Spectral analysis"”.
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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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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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Interactive spectral analysis learning module
… for engineering students, an interactive spectral analysis learning module was developed for the course Biomedical Signal and Image Processing (HST582J/6.555J/16.456J). The design of this module is based on the Star Legacy model, a pedagogical framework that promotes the creation of guided …
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Spectral analysis of random number generators
… on the mathematical representations of the spectral analysis of a fair pseudorandom number generator. From this representation, a reasonable "spectral" expectation is determined. An algorithm which applies the developed method is described, and a modified shift register random number …
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Spectral Analysis of Complex Dynamical Systems
… that there is an entire field devoted to it; spectral analysis. In this thesis, we perform spectral analysis on two separate complex dynamical systems. The vibrations along a continuous string or a string with beads on it are the governed by the continuous or discrete wave equation. We derive …
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Spectral analysis of high-frequency finance
Popular across a wide range of fields, spectral analysis is a powerful technique for studying the behavior of complex systems. It decomposes a signal into many different periodic components, each associated with a specific cycle length. We argue that the application of spectral analysis to finance …
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Spectral analysis of X-ray binaries
… of X-ray binaries. Two of those revolve around spectral characteristics of neutron star low-mass X-ray binaries (NS-LMXBs), with a particular source, XTE J1701-462, playing a central role. First, I construct and study color-color and hardness-intensity diagrams (CDs and HIDs) for a large sample …
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Spectral Analysis of Local Atomic Environments
… thesis presents a comprehensive investigation of spectral descriptors constructed from spherical harmonic expansions to represent the geometries of local atomic environments. Systematic computational experiments evaluate the robustness of these descriptors to geometric perturbations and their …
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Randomized estimates in power spectral analysis
… a random process. It has shown how the power spectral density function φ(ω) can be used to specify completely a stationary Gaussian process. Estimation of this function is therefore one of the fundamental problems in random time-series. The power spectral density function is given by φ(ω) = …
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Spectral analysis for rod formation dynamics
This thesis deals with the production of a continuous rod of non-uniform properties which is formed by wrapping fibers with a thin membrane. This rod is driven axially and cut into segments. Measurements of pressure, temperature, axial force, axial velocity, horizontal and vertical displacements …
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AN FFT SPECTRAL ANALYSIS FOR SYSTEM IDENTIFICATION
… by the use of the information contained in the spectral density functions of a test signal applied to the system. This thesis reviews the basic relationships between a system transfer function am the spectral density functions of the system input signal am output signal. The method of obtaining …
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Semiclassical spectral analysis of discrete Witten Laplacians
… of a discrete Witten complex and a semiclassical analysis of the corresponding discrete Witten Laplacian on 1-forms. The result can be reformulated in terms of metastable Markov processes on the lattice.
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Subordinacy and spectral analysis of Schrödinger operators
This thesis is concerned with the spectral analysis of Schrödinger operators with central potentials, and some related aspects of scattering theory. After an introductory discussion on the aims of the thesis and its relation to existing work, the background mathematical material required for …
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OligoChannel Spectral Analysis in stereotactic laser neurosurgery
In stereotactic laser neurosurgery a tumor in the human brain is resected by a pulsed high energy laser beam. The laser beams for diagnosis and ablation of cancerous tissue are supplied through a probe. The whole resection is planned with a computer system. These planning data are based on …
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Cross-Spectral Analysis For Spatial Point-Lattice Processes
… arid a lattice process using two-dimensional spectral techniques. Simulated spatial point-lattice patterns are used to demonstrate how the different cross-spectral statistics can reveal correlation between the two components. A method to adjust for jumps that normally occur in the …
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Using Spectral Analysis to Evaluate Flute Tone Quality
… analyzed using application programs, Harmonic Analysis Tools (HAT), created for this study. HAT uses digital signal processing techniques to produce "spectral signatures". The signatures consist of the harmonic content, pitch, and amplitude of a sample. In the future, with further development, …
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Spectral analysis of the helium nova V445 Puppis
Multifibre spectrographic observations of the bipolar helium nova V445 Puppis were made over fivenights (two nights in January 2006 and three nights in January 2007) using the IMACS Integral Field Lnit spectrograph on the Magellan I Telescope. Of these. spectra from the two best nights. 4 January …
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