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.
Results
Showing 1 to 20 of 21 for “"smoothly-varying"”.
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Acoustic scattering in waveguides with smoothly-varying or discontinuous elastic boundaries
… applied are a two-dimensional waveguide with a varying impedance condition and an elastic-walled waveguide with varying bending stiffness. Limiting versions of the two problems are solved using the Wiener-Hopf technique. This provides a check on the varying-parameter solutions as well as being …
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Extracting orientation and scale from smoothly varying textures with application to segmentation
The work in this thesis focuses on two main computer vision research topic: image segmentation and texture modeling. Information theoretic measures have been applied to image segmentation algorithms for the past decade. In previous work, common measures such as mutual information or J divergence …
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Rapid Implicit Diagonalization of Variable-Coefficient Differential Operators Using the Uncertainty Principle
… for an infinite number of smaller pieces, or a smoothly varying coefficient. We hypothesize that by treating a smoothly varying function as a piecewise constant function with infinitely many pieces, this potential method can be realized. Through the Uncertainty Principle, we will formulate …
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Spatio-temporal data fusion in cerebral angiography
… that constrains the volumes to have both smoothly varying regions separated by edges and sparse regions of non-zero support. Results are presented on both clinical and simulated phantom data sets. The 3D time series results are visualized using the following tools: time series of intensity …
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Bayesian nonparametric learning of complex dynamical phenomena
… HDP-HMM, that allows more robust learning of smoothly varying state dynamics through a learned bias towards self-transitions. We show that this sticky HDP-HMM not only better segments data according to the underlying state sequence, but also improves the predictive performance of the learned …
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Developments in topology and shape optimization
… This also has the effect of generating smoothly varying microstructures.
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General linear cameras : theory and applications
… multiperspective imaging system that captures smoothly varying set of rays, I show how to map the rays onto a 2D ray manifold embedded into a 4D linear vector space. The GLC model can then be use to analyze the tangent planes on this manifold. Geometric structures associated with the local GLC …
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Applications of quantum measurement techniques: counterfactual quantum computation, spin hall effect of light, and atomic-vapor-based photon detectors
… weak measurements. Extensions of the effect to smoothly varying media are also presented, along with utilization of a time-varying version of the weak measurement techniques. Our approach to ultra-high-efficiency photon detection develops and extends a recent novel non-solid-state scheme for …
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Hysteresis modeling of wood joints and structural systems
… single mathematical form, produces a versatile, smoothly varying hysteresis that models previously observed behavior of wood joints and structural systems, namely, (1) nonlinear, inelastic behavior, (2) stiffness degradation, (3) strength degradation, (4) pinching, and (5) memory. The …
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Study of Ultracold Fermi Gases in the BCS-BEC Crossover: Quantum Monte Carlo Methods, Hydrodynamics and Local Density Approximation.
… are often used for studying the propagation of smoothly varying perturbations. In this Thesis we use QMC techniques for studying the problem of ferromagnetism in repulsive or effectively repulsive ultracold gases without a lattice and the problem of the Bardeen-Cooper-Schrieffer to …
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Application of the Coupled Dipole Method for Predicting Swelling and Exfoliation Behavior of Layered Inorganic Materials
… compensate for edge effects in order to obtain smoothly varying interaction energy curves for large platelets.</p>
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Scattering of internal gravity waves
… in the ocean interior or near more gradually varying topography (e.g. Toole et al. 1997, J. Geophys. Res. 102). Such observations suggest that interaction of waves with rough topography may act to skew wave energy spectra to high wavenumbers and hence promote wave breaking and fluid mixing. …
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Development of domain integral and generalized finite element methods for three dimensional analysis of near-surface cracking in flexible pavements
… As a result, extracted functions are smoothly varying, which is crucial to obtain accurate crack propagation paths in 3-D for elastic or inelastic materials. Crack front directionality is captured by the proposed formulations and implementation using an energy release rate-based …
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Stochastic dynamic response of wood structural systems
… single mathematical form, produces a versatile, smoothly varying hysteresis that models previously observed behavior of wood joints and structural systems, namely, (1) nonlinear, inelastic behavior, (2) stiffness degradation, (3) strength degradation, (4) pinching, and (5) memory. The …
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Spectral methods for circuit analysis
… are complex exponential basis functions with smoothly varying frequencies. The TMHB features a matrix-implicit Krylov-subspace solution approach of same complexity as the standard harmonic balance method. As the TMHB solution is computed in a pseudo domain, we give a procedure for computing …
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Ocean bottom seismic scattering
… be extremely fine to accurately accommodate a smoothly varying water-solid interface which does not align with the grid. Regardless of the discretization concerns, the rough seafloor models presented here demonstrate the arrivals expected from larger scale sinusoidal topography as well as the …
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Interference and resonance of internal gravity waves
… that internal waves propagate through a varying background density stratification. We begin by theoretically studying internal waves that are harmonically forced at a horizontal level above a semi-infinite, non-uniform density stratification. Starting with a two-layer model, we identify …
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Simulation-based Design with Polynomial Ridge Approximations
… of the quantities of interest. For modelling smoothly varying functions, the use of orthogonal polynomials has seen considerable research that establishes its efficacy for surrogate modelling, especially in applications such as uncertainty quantification. Meanwhile, ridge approximations …
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Essays on Nonparametric Estimation of Asset Pricing Models
… noisy high-frequency data to estimate the time-varying state-price density implicit in European option prices. A dynamic kernel estimator of the conditional pricing function and its derivatives is proposed that can be used for model-free risk measurement. Infill asymptotic theory is derived that …
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Self-consistent dynamical and radiative models of low-luminosity active galactic nuclei
… evolution and use these results to motivate a smoothly varying time-dependent scaling between simulation and physical units. We show that this time-dependent scaling procedure effectively maps the transient GRMHD simulation data onto a quasi-steady solution that can then be used in radiative …
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