Index Catalog // ScholarsArchive@OSU

Nonuniform sampling problems in computed tomography

Creator:: Gratton, Larry A.
Abstract:: Two problems involving high-resolution reconstruction from nonuniformly sampled data in x-ray computed tomography are addressed. A technique based on the theorem for sampling on unions of shifted lattices is introduced which exploits the symmetry property in two-dimensional fan beam computed tomography and permits the reconstruction of images with twice the...
Resource Type:: Dissertation
Full Text:: : _______________________ _ Adel Faridani Two problems involving high-resolution reconstruction from nonuniformly

π-line reconstruction formulas in computed tomography

Creator:: Hass, Ryan Andrew
Abstract:: X-ray computed tomography is a noninvasive imaging modality capable of reconstructing exact density values of 3D objects. Computed tomography machines are deployed across the world to provide doctors with an image that reveals more detail than a standard x-ray image. We investigate algorithms based on exact computed tomography reconstruction formulas...
Resource Type:: Dissertation
Full Text:: -Line Reconstruction Formulas in Computed Tomography Abstract approved: Adel Faridani X-ray computed

Determination of the Filippov solutions of the nonlinear oscillator with dry friction

Creator:: Moreland, Heather L.
Abstract:: In previous papers by Awrejcewicz in 1986 and Narayanan and Jayaraman in 1991, it was claimed that the nonlinear oscillator with dry friction exhibited chaos for several forcing frequencies. The chaos determination was achieved using the characteristic exponent of Lyapunov which requires the right-hand side of the differential equation to...
Resource Type:: Masters Thesis
Full Text:: shared. Many thanks to the members of my committee, Professors Jeff Barnes, Adel Faridani, and John Lee

Finite element transport using Wachspress rational basis functions on quadrilaterals in diffusive regions

Creator:: Davidson, Gregory G.
Abstract:: Wachspress rational functions are ratios of polynomials having certain properties which make them good candidates for basis functions in finite element methods. In addition. it had been theorized that Wachspress rational weight functions should Provide a full-resolution discretization of the neutral particle transport equation in thick diffusive regions, but this...
Resource Type:: Masters Thesis

Modeling studies of ocean circulation using inverse methods and bifurcation theory

Creator:: Vernieres, Guillaume
Abstract:: We present a study of the ocean circulation using state of the art numerical and data assimilation techniques. The second chapter of the thesis presents the development and application of generalized inversion to a simple dynamical model of Lake Kinneret. The intent was to develop the necessary tools to implement...
Resource Type:: Dissertation
Full Text:: opportunity to work with him. Thanks to the members of my committee, James Richman, Adel Faridani, Ted Strub

Magnetically assisted liquid-solid fluidization in a gradient magnetic field : Theory and application

Creator:: Sornchamni, Thana
Abstract:: Development of efficient methods for the destruction of solid wastes and recovery of valuable resources is needed to support long-duration manned missions in space. In particular, these technologies are required for deployment in hypogravity and microgravity environments, such as at the lunar or Martian surfaces. Gradient Magnetically Assisted Fluidized Bed...
Resource Type:: Dissertation
Full Text:: Kimura, Dr. Adel Faridani, Dr. Todd Palmer, and Dr. Richard Vong. Their comments, suggestions and time

Dynamic behavior of ferromagnetic particles in a liquid-solid magnetically assisted fluidized bed (MAFB) : theory, experiment, and CFD-DPM simulation

Creator:: Pinto-Espinoza, Joaquin
Abstract:: Magnetically Assisted Fluidized Bed (MAFB) is a novel technology where an external magnetic field with constant gradient interacts with magnetically susceptible particles. The linear magnetic field creates two type of forces: external and interparticle magnetic forces. A theoretical mathematical model based on the interaction of ideal dipoles is proposed to...
Resource Type:: Dissertation
Full Text:: Koretski, Dr. Adel Faridani, and Dr. Michael Milota for their unconditional support. I would also like to

Calculation of Pulse height distributions from deterministic transport simulations

Creator:: Benz, Jacob M.
Abstract:: In source-detector radiation transport simulations, pulse height distributions are a useful metric in assessing the effectiveness of nuclear instrumentation. In the area of spectroscopy, pulse height distributions are used to identify an unknown source. It is widely believed that pulse height distributions cannot be created using deterministic methods. This quantity...
Resource Type:: Masters Thesis

The nonlinear optical properties of gallium arsenide pertaining to terahertz generation

Creator:: Hurlbut, Walter C.
Abstract:: Gallium arsenide shows excellent promise for terahertz generation using mid infrared. This is for two reasons. First, the indices of refraction for the terahertz (nTHz=3.61 at 1 THz) and mid infrared (nopt=3.431 at 2 μm) are close allowing a long interaction length. Second, the linear absorption is low at terahertz...
Resource Type:: Dissertation

Coastal ocean response to alongshore variations in topography and wind forcing

Creator:: Castelao, Renato Menezes
Abstract:: The effects of alongshore variability in topography (banks and capes) and spatial variability in the wind forcing, including the wind-stress curl, on coastal ocean circulation are studied using a combination of observations and model simulations. Satellite sea surface temperature observations are used to describe the seasonal evolution of temperature fronts...
Resource Type:: Dissertation

ScholarsArchive@OSU

Nonuniform sampling problems in computed tomography

π-line reconstruction formulas in computed tomography

Determination of the Filippov solutions of the nonlinear oscillator with dry friction

Finite element transport using Wachspress rational basis functions on quadrilaterals in diffusive regions

Modeling studies of ocean circulation using inverse methods and bifurcation theory

Magnetically assisted liquid-solid fluidization in a gradient magnetic field : Theory and application

Dynamic behavior of ferromagnetic particles in a liquid-solid magnetically assisted fluidized bed (MAFB) : theory, experiment, and CFD-DPM simulation

Calculation of Pulse height distributions from deterministic transport simulations

The nonlinear optical properties of gallium arsenide pertaining to terahertz generation

Coastal ocean response to alongshore variations in topography and wind forcing

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