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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
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    includes the helical inversion formulas of Katsevich and Pan et al. Our work provides numerical analysis

  • Zimbabwean counselors' knowledge of and attitudes toward HIV/AIDS

    Creator:
    Richards, Kimberly A.
    Abstract:
    Acquired Immune Deficiency Syndrome (AIDS) has become the world's foremost health threat and is the number one killer in Zimbabwe. Acquired Immune Deficiency Syndrome impacts not only the individual who has AIDS, but on nuclear and extended families, and all aspects of society in Zimbabwe. Since studies have indicated that...
    Resource Type:
    Dissertation
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    ' attitudes towards and knowledge of HIV/AIDS. Additionally, the study explored the emotions the counselors

  • Zero kinetic energy photoelectron spectroscopy of polycyclic aromatic hydrocarbons

    Creator:
    Zhang, Jie
    Abstract:
    In this dissertation, I present electronic spectra of a few polycyclic aromatic hydrocarbons (PAHs): tetracene, pentacene, pyrene, benzo[g,h,i]perylene and benzo[a]pyrene using resonantly enhanced multiphoton ionization (REMPI) and zero kinetic energy (ZEKE) photoelectron spectroscopy. The work of tetracene and pentacene also combine a laser desorption source with a ZEKE spectrometer, demonstrating...
    Resource Type:
    Dissertation
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    multiphoton ionization (REMPI) and zero kinetic energy (ZEKE) photoelectron spectroscopy. The work of

  • Zero Kinetic Energy Photoelectron Spectroscopy of Polycyclic Aromatic Hydrocarbons

    Creator:
    Harthcock, Colin
    Abstract:
    In this dissertation, I describe spectroscopic studies of jet-cooled polycyclic aromatic hydrocarbons (PAH) and one nitrogen substituted PAH (PANH) using pulsed field zero kinetic energy (ZEKE) photoelectron spectroscopy and resonantly enhanced multiphoton ionization (REMPI) spectroscopy. Recently, there has been a demand for far-infrared (FIR) spectral information of astrophysically relevant molecules...
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    Dissertation
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    the launching of the Herschel Space Observatory and the Stratospheric Observatory for Infrared

  • Youth Wellbeing During the First School Year of the Covid-19 Pandemic: An Intersectional Analysis

    Creator:
    Fenske, Linda J.
    Abstract:
    During the first full school year of the Covid-19 pandemic, two central contexts for adolescent development—home and school—changed utterly. In Oregon, most middle- and high schoolers attended school entirely remotely from the beginning of the pandemic, in March, 2020, through the end of April, 2021, removing both the supports available...
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    Dissertation
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    . Fenske for the degree of Doctor of Philosophy in Human Development and Family Studies presented on June

  • Young Adults’ Personal Goal Appraisals over the Great Recession Years : A Case Study of Germany

    Creator:
    Recksiedler, Claudia
    Abstract:
    In 2008, the “Great Recession” gained its momentum and quickly grew into a global crisis that led to massive gross domestic product declines and job losses in countries around the world. Relative to prior economic downturns, young adults were greatly affected by the Great Recession. This likely placed a premium...
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    Dissertation
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    Recksiedler for the degree of Doctor of Philosophy in Human Development and Family Studies presented on

  • Yosemite region nitrogen deposition and patterns in the composition of lichen communities

    Creator:
    Hutten, Martin
    Abstract:
    This dissertation describes patterns in epiphytic macrolichen community composition along a nitrogen deposition gradient in the Yosemite region of the Sierra Nevada in California. This region is part of the largest federal air quality Class 1 designated air-shed in the western United States, covering the entire crest of the Sierra...
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    Dissertation
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    . Hutten for the degree of Doctor of Philosophy in Botany and Plant Pathology presented on October 20

  • Yeast extractives in the nutrition of San Francisco sourdough bacteria (Lactobacillus sanfrancisco)

    Creator:
    Berg, Ronald Wayne
    Abstract:
    A laboratory-prepared hot-water extract of yeast is required for vigorous growth of San Francisco sourdough bacteria (Lactobacillus sanfrancisco) in pure culture. This requirement was examined with the goal of determining what is unique about fresh yeast extractives (commercial extractives exhibit much lower growth promoting activity), and which components of fresh...
    Resource Type:
    Dissertation
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    my own mistakes which are essential to the exercise and development of creativity. Thanks are due

  • X-ray and proton induced ultrastructural changes in Chlamydomonas reinhardi, with special reference to the dividing cell

    Creator:
    Gruber, Helen Elizabeth
    Resource Type:
    Dissertation
    Full Text:
    Chlamydomonas reinhardi, with special reference to the dividing cell AN ABSTRACT OF THE THESIS OF HELEN

  • Worldwide phylogeography and local population structure of the rough-toothed dolphin (Steno bredanensis)

    Creator:
    Albertson, G. Renee
    Abstract:
    Several dolphin species have global distributions. The extent of their radiation and limits to gene flow are presumably a product of oceanographic features both recent and historical, behavioral specializations and social organization. Rough-toothed dolphins (Steno bredanensis) are globally distributed in tropical and subtropical waters and are generally found in depths...
    Resource Type:
    Dissertation
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    8, 2014. Title: Worldwide Phylogeography and Local Population Structure of the Rough-Toothed