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 35 for “"Fast Fourier Transforms"”.
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Fast Fourier Transforms on Distributed Memory Parallel Machines
… such algorithms to compute the Discrete Fourier Transform (DFT) of real and complex data. The implementations given in this dissertation work for a class of data distributions commonly encountered in scientific applications, known as the block scattered data distributions. The …
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Parallel processor architecture for a digital beacon receiver
… using digital signal processing techniques. Fast Fourier transforms are used to locate the carrier within 0.5 Hz. The outputs of the receiver include the frequency and the power of the carrier.
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Computational Approaches to Silicon-Based Nanostructures
… the solution of Schrodinger's equation based on Fast Fourier Transforms is described. Using this simulation method, it becomes possible to solve Schrodinger's equation in the one band approximation for arbitrary band structures, putting a more complete description of high energy states and …
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Fast Fourier transform on a 3D FPGA
Fast Fourier Transforms perform a vital role in many applications from astronomy to cellphones. The complexity of these algorithms results from the many computational steps, including multiplications, they require and, as such, many researchers focus on implementing better FFT systems. However, all …
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A study of modal-space control of a beam-cable structure: experiment and theory
… and theoretical response on the basis of Fast Fourier Transforms of transient time data.
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Tip clearance and angle of attack effects upon the unsteady response of a vibrating flat plate in crossflow
… simulating the flISt bending mode. Averaged Fast Fourier Transforms were used to determine pressure oscillation amplitudes and phase lags with respect to the plate motion.
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LAMINAR TURBULENT TRANSITION - SPECTRAL ANALYSIS AND COHERENT STRUCTURES OF DNS WAVEPACKETS
… and amplitude on the transition process. Fast Fourier transforms (FFT) are then performed to extract the one, two and three-dimensional (3D) spatio-temporal spectra of the flow. In particular, the three-dimensional spectrum yields new information about modes that overlap ambiguously in …
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Stream Communication and Computation in the Eight-meter-wavelength Transient Array (ETA) Radio Telescope
… digital sampling, downconversion, filtering, Fast Fourier Transforms, and beamforming operations and is performed by 28 commercial-off-the-shelf (COTS) FPGA boards. Sixteen of the FPGA boards constitute the reconfigurable computing cluster (RCC) which performs the FFT and beamforming …
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Characterization of polystyrene-block-poly (acrylic acid) micelles
… the order of the films, as was demonstrated by Fast Fourier Transforms of their AFM images. Annealing for longer periods of time or at temperatures significantly above the glass transition temperature destroyed the micelles.
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Fast Fourier transform square wave voltammetry
Fast Fourier transforms are introduced as a.unique digital data handling tool for square wave voltammetry. Theoretical square wave voltammogra.ms were examined to study the effect of experimental parameters in the spatial frequency domain. A new method was developed to determine truncation …
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Development and testing of the AXBT Realtime Editing System (ARES)
… The ARES Data Acquisition System performs fast Fourier transforms on windowed segments of demodulated signal transmitted from the AXBT and uses the resulting spectra to identify valid temperature-depth observations. When evaluated using 389 profiles, the ARES data acquisition system …
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Determining capture zones for three-dimensional, heterogeneous, anisotropic aquifers by Monte Carlo analysis
… conductivity fields were generated using the fast Fourier transforms method (Gutjahr et al., 1996) and incorporated into a confined, 128 m long by 64 m wide grid that included sufficient vertical layers to maintain the vertical correlation length. Constant head and no-flow boundaries were …
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A signal processing approach to ultrasound localization microscopy
… filtering operation in three-dimensional (3D) Fourier domain and provide rigorous theoretical analysis on the performance of the filtering operation. Numerical experiments validate that the proposed filtering method is able to separate the microbubbles with respect to the speed and direction of …
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Development and testing of the AXBT Realtime Editing System (ARES)
… The ARES Data Acquisition System performs fast Fourier transforms on windowed segments of demodulated signal transmitted from the AXBT and uses the resulting spectra to identify valid temperature-depth observations. When evaluated using 389 profiles, the ARES data acquisition system …
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Computational approaches to silicon based nanostructures
… the solution of Schrodinger's equation based on Fast Fourier Transforms is described. Using this simulation method, it becomes possible to solve Schrodinger's equation in the one band approximation for arbitrary band structures, putting a more complete description of high energy states and …
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Software-hardware systems for the Internet-of-Things
… which is capable of performing a million-point Fourier transform in real-time, while consuming 40 times less power than prior fast Fourier transforms. Then, it presents Caraoke, a small, low-cost and low-power sensor, which harvests its energy from solar and enables new smart city applications, …
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A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio
… resolution of spectra based on standard fast Fourier transforms. Higher resolution spectra are obtained by "segmented correlation", a new method for testing ADCs. Two different techniques have been found for clocking the superconducting modulator at frequencies in the tens of GHz. In the …
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Phasor Measurement Unit (PMU) : based system for event detection on synchronous generators
… methods. Method One used a digital filter, and fast Fourier transforms for analysis. Method Two used a matched filter algorithm. Method Three worked on the principals of machine learning, using the Gaussian Process Classifier (GPC) for identification of events in the PMU data. The Parameter …
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Theory, design and implementation of a digital receiver for the Advanced Communications Technology Satellite (ACTS) beacons
… each receiver utilizes the results of multiple fast Fourier transforms to reliably identify the carrier tone amidst neighboring modulation tones. The acquisition procedure, can reliably identify the carrier signal at signal-to-noise ratios down to 10 dB in a 20 Hz bandwidth (23 dBHz in a 1 Hz …
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