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  • 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:
    . c©Copyright by Ryan Andrew Hass November 25, 2009 All Rights Reserved π-Line Reconstruction

  • The Works Progress Administration in Oregon : An Administrative Overview

    Creator:
    Butcher, Karyle S.
    Abstract:
    The depression of the 1930s had an early effect on the state of Oregon. A decline in timber and agricultural production resulted in severe unemployment in the late 1920s. State and local charitable organizations attempted to care for the unemployed but they did not have the financial resources to do...
    Resource Type:
    Masters Thesis
    Full Text:
    . Donald H. Farness and Dr. Peter C. List for their advice and timely suggestions. I would also like to

  • The Variable Speed Wave Equation and Perfectly Matched Layers

    Creator:
    Kim, Dojin
    Abstract:
    A perfectly matched layer (PML) is widely used to model many different types of wave propagation in different media. It has been found that a PML is often very effective and also easy to set, but still many questions remain. We introduce a new formulation from regularizing the classical Un-Split...
    Resource Type:
    Dissertation
    Full Text:
    discretized system and provide a priori error estimations. c©Copyright by Dojin Kim June 4, 2015 All

  • The Stokes problem of fluid mechanics, Riesz transform, and the Helmholtz-Hodge decomposition : probabilistic methods and their representations

    Creator:
    Kim, HoeWoon
    Abstract:
    The flow of incompressible, viscous fluids in R³ is governed by the non-linear Navier-Stokes equations. Two common linearizations of the Navier-Stokes equations, the Stokes equations and the Oseen equations, are studied in this thesis using probabilistic methods. The incompressibility condition presents new challenges for the well known theory relating partial...
    Resource Type:
    Dissertation
    Full Text:
    committee members, Ed Waymire, Donald Solmon, Ralph Showalter, and Glenn Evans. Personal I wish to thank

  • The effects of diisocyanate-polyol resins on the properties of particleboard.

    Creator:
    Milota, Michael R.
    Abstract:
    The ability of the resin to deform plastically can be an important factor when considering the mechanical properties of particleboard. Between resin droplets there exists an unbonded region that forms the surface for a crack. When particleboard is deformed stress concentrations develop at the crack tips in the voids. A...
    Resource Type:
    Masters Thesis

  • Studies to improve lactic acid bacterial starter cultures

    Creator:
    Khosravi, Lewa
    Abstract:
    Three commercial sausage starter cultures were grown in an internal-pH-controlled medium (PHASE 4) and in a soluble phosphate-buffered medium. The cultures were tested by comparing viable counts before and after freezing at -40 C or freeze-drying and subsequent storage for 3 months in the frozen or dried state. Strains varied...
    Resource Type:
    Dissertation
    Full Text:
    . Stephen Kaattari, Prof. Floyd W. Bodyfelt, Dr. Donald E. Mattson , Dr. William C. Denison and Dr

  • Spatial, diel and seasonal variations in dissolved oxygen and temperature within a stratified lake

    Creator:
    Smith, Stanley Allan
    Abstract:
    Spatial, diel and seasonal variations in dissolved oxygen and temperature were measured in Triangle Lake, Oregon. Spatial dissolved oxygen and temperature variations measured in the stratified lake are presented to illustrate the horizontal uniformity of the lake and to demonstrate the applicability of the one dimensional assumption for sampling and...
    Resource Type:
    Masters Thesis
    Full Text:
    Research. Committee members, Professor Donald C. Phillips and Assis- tant Professor Gerald E. Davis are

  • Representations of fractional Brownian motion

    Creator:
    Wichitsongkram, Noppadon
    Abstract:
    Integral representations provide a useful framework of study and simulation of fractional Browian motion, which has been used in modeling of many natural situations. In this thesis we extend an integral representation of fractional Brownian motion that is supported on a bounded interval of ℝ to integral representation that is...
    Resource Type:
    Dissertation
    Full Text:
    , Professor David Finch, Yevgeniy Kovchegov, Donald Solmon and Thinh Nguyen for their advices and comments

  • Post-dispersal seed fates in a Western Oregon native prairie

    Creator:
    Clark, Deborah L.
    Abstract:
    Knowledge of post-dispersal seed fates and other regeneration characteristics is crucial for predicting abundances and distributions of populations and, ultimately, community species composition and diversity. Seed fate studies, however, are rare primarily due to the difficulty of determining seed fates and causes of mortality. This thesis investigated post-dispersal seed fates...
    Resource Type:
    Dissertation
    Full Text:
    , Mark V. Wilson, Kenneth B. Johnson, Patricia S. Muir, Donald B. Zobel, and Jeffrey C. Miller, for

  • Phyto-edaphic relationships and ecotypic development of Festuca idahoensis in eastern Oregon habitat types of Artemisia tridentata

    Creator:
    Doescher, Paul Steven
    Abstract:
    This research assessed certain specific plant-soil and community interrelationships in eastern Oregon habitat types dominated by subspecies of Artemisia tridentata. The first evaluation described plant-induced soil chemical patterns for Artemisia tridentata plant communities of high perennial grass-low shrub and low perennial grass-high shrub composition. Soil concentrations of total nitrogen, organic...
    Resource Type:
    Dissertation
    Full Text:
    preparation of this dissertation. A special note of thanks to the members of my committee, Dr. William C