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 14 of 14 for “"Fourier amplitude"”.
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Simulation of fluctuating wind pressures on low building roofs
… tunnel measurements. Thereafter, based on the Fourier representation of time series, a new time series generation technique capable of simulating Gaussian as well as non-Gaussian wind pressure fluctuations is developed. Both Fourier amplitude and phase, which are required for the simulations, …
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Quantification of Uncertainties for Conducting Partially Non-ergodic Probabilistic Seismic Hazard Analysis
… database to develop a predictive model for the Fourier Amplitude Spectra of ground motions. The ground motion model (GMM) residuals are used to investigate the stability of site terms across different tectonic regimes. We observe that empirical site terms are stable across different tectonic …
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An Evaluation of Scaling Methods for Earthquake Response Spectra
… are the spectrum intensity and the mean Fourier amplitude.
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Development and evaluation of a stream temperature component within the PRMS watershed modeling program
… 2]) of .77. A sensitivity analysis run using the Fourier Amplitude Sensitivity Testing (FAST) technique suggested that the most sensitive factors are solar radiation, air temperature, and rainfall amount. It was concluded that these will be the strongest factors in terms of propagation of errors …
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Uncertainty and sensitivity analysis for long-running computer codes : a critical review
… indices and Sobol' Monte Carlo algorithms), and Fourier amplitude sensitivity tests. In addition, this thesis reviews several existing metamodeling techniques that are intended provide quick-running approximations to the computer models being studied. Because stochastic simulation-based UA and SA …
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Texture description and segmentation in image processing
… textures can adequately be represented by their Fourier amplitude spectra only, with the phase spectra modelled by a random process. It is shown that, under mild restrictions, the above model leads to a stationary random process. Results indicate that this assumption is valid for those textures …
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On the importance of input variables and climate variability to the yield of urban water supply systems
… (SA) techniques, namely the Morris Method, the Fourier Amplitude Sensitivity Test and Sobol’s method of SA. These techniques produced mostly reliable results which revealed some limitations of the SA framework adopted. The findings and conclusions of the preliminary study bore important …
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Integrated protocol for ground and structures condition assessments using ambient vibration
… Horizontal to Vertical Spectral Ratio (HVSR) and Fourier Amplitude Spectra (FAS) via GEOPSY software. Started by ground condition assessment protocol, the soil classification, soil thickness, and microzonation maps were determined for local soil condition. Meanwhile, in structural condition …
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Differences in image properties across facial expressions: effects on perceived contrast, stimulus efficacy and oculomotor responses
… properties that define facial stimuli (their Fourier amplitude spectra), and the extent that such natural differences in image properties of expressions are influenced under experimental conditions. The present thesis contributes findings to the broader literature, demonstrating that fear …
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Nonlinear site amplification functions for Central and Eastern North America
… functions for the response spectrum (RS) and Fourier amplitude spectrum (FAS) and a correction factor to convert site amplification from a 3000 m/s CENA hard rock condition to a 760 m/s condition. The modular RS amplification model includes terms for time averaged shear wave velocity in the …
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Q Models for Lg Wave Attenuation in the Central United States
… in the central United States. A study of the Fourier amplitude spectra shows the Lg phase exhibiting strong attenuation for ray paths from Arkansas, southwest through the Ouachita Orogenic Belt and into central Texas, and south into the Gulf Coastal region. Less attenuation is seen in central …
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Conventional and deep learning-based site amplification models for central and eastern North America
… to develop robust response spectrum (RS) and Fourier amplitude spectrum (FAS) amplification models using an enhanced and enlarged amplification database. The first segment of this study is to perform over 3.6 million 1D linear, equivalent-linear and nonlinear site response analyses via high …
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Combining smart model diagnostics and effective data collection for snow catchments
… I used such an efficient method called Fourier Amplitude Sensitivity Test, which has a smart sampling scheme. Combining the two methods TIGER and TEDPAS provided a powerful tool for model assessment. With WaSiM-ETH applied to the Weisseritz catchment as a case study, I found insufficient …
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Development of Computational Tools for Characterization, Evaluation, and Modification of Strong Ground Motions within a Performance-Based Seismic Design Framework
One of the most difficult tasks towards designing earthquake resistant structures is the determination of critical earthquakes. Conceptually, these are the ground motions that would induce the critical response in the structures being designed. The quantification of this concept, however, is not …