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 234 for “"Frequency analysis"”.
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Statistical time-frequency analysis
Time-frequency representations (TFRs), such as the short-time Fourier transform, the wavelet transform, and the Wigner distribution, represent signal characteristics jointly in time and frequency and provide a versatile set of tools for the analysis and processing of nonstationary signals. Recent …
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Frequency Analysis of Complex Auditory Cues.
… the ear has been thought to perform a Fourier analysis on the incoming waveform (Boring, 1942).
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Copula-Based Multivariate Hydrologic Frequency Analysis
Multivariate frequency distributions are being increasingly recognized for their role in hydrological design and risk management. The conventional multivariate distributions are severely limited in that all constituent marginals have to be from the same distribution family. The copula method is a …
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Hydrological Frequency Analysis under Nonstationary Conditions
The hydrological frequency analysis (HFA) evaluates the recurrence of extreme flow and precipitation events and guides water-related management and risk assessment. The conventional HFA assumes stationarity in the underlying process. However, climate change and other changes in the watersheds may …
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Frequency analysis of an underwater explosion
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1944.
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Multivariate hydrological frequency analysis and risk mapping
<p>In hydrological frequency analysis, it is difficult to apply standard statistical methods to derive multivariate probability distributions of the characteristics of hydrologic or hydraulic variables except under the following restrictive assumptions: (1) variables are assumed independent, (2) …
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Frequency analysis of structures with foundation interaction
Thesis. 1975. M.S. cn--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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A frequency analysis of the Korotkoff sounds.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1969.
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Transfer function estimation using time-frequency analysis
… function estimate despite noisy data, a time-frequency analysis approach to system identification has been developed. The method is based on the observation that for a linear system, an input at a given frequency should result in a response at the same frequency, and a time localized frequency …
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Time frequency analysis techniques in terahertz pulsed imaging
… to a simple mixture of Gaussians. Joint time-frequency techniques such as those used in RADAR or ultrasound - windowed Fourier transforms and wavelet transforms - are applied to THz data, and are shown to be appropriate tools to use when analysing and processing THz pulses, particularly in …
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Time-frequency analysis techniques for non-intrusive load monitoring
The work in this thesis examines time-frequency analysis techniques and in particular the wavelet transform to extract the features contained within the electrical load signals. A novel approach that is based on wavelet design was utilized to generate a wavelet library which was used to match each …
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Neural models of modulation frequency analysis in the auditory system
… type that is known to encode the modulation frequency of AM stimuli by its distinct temporal responses. The second model component consists of a neural circuit that transforms temporal AM information, provided by the ideal onset model, into a rate-based representation of AM information. This …
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Frequency Analysis and Sheared Filtering for Multidimensional Effects in Rendering
… filter that is customized to each pixel's frequency content. We finally present practical algorithms that share samples between pixels, reduce sampling requirements by an order of magnitude, and provide significant speedups for many of the most expensive computations in computer graphics.
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A frequency analysis of the rapidly oscillating Ap star HD 101065
… describes an attempt to perform a definitive frequency analysis of the rapidly oscillating Ap star HD 101065. The results of the intense observing program and the subsequent frequency analysis have been published and we reproduce them here in their entirety. The disadvantage in this approach …
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Time-frequency analysis of Lamb waves using the Morlet wavelet transform
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Frequency analysis of catheter systems used for invasive blood pressure monitoring
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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On the frequency analysis of beams with non-uniform cross sections
This thesis presents an evaluation of a new method first suggested by Dr. H. Marcus for determining the natural frequencies of lateral vibrations for elastic beams of variable cross sections.
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