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  • High quantum-yield phosphors via quantum splitting and upconversion

    Creator:
    Jeong, Joayoung
    Abstract:
    The Gd3+ ion has been used to induce quantum splitting in luminescent materials by using cross-relaxation energy transfer (CRET). In Nd:LiGdF4, quantum splitting results from a two-step CRET between Gd3+ and Nd3+, first involving a transition 6G→6I on Gd3+ and an excitation within the 4f3 configuration of Nd3+ followed by...
    Resource Type:
    Dissertation
    Full Text:
    , Michael M. Lerner, William W. Warren, Jr., and John E. Baham for their encouragement in helping me to

  • A moving boundary model of calcium alginate gel formation and the estimation of diffusion and mass transfer coefficients

    Creator:
    Inoue, Shawna K.
    Abstract:
    Calcium alginate gels are widely used in the biotechnology, food, and pharmaceutical industries for cell immobilization, food additives, and controlling the release of therapeutic agents. Different gelation conditions can lead to different gel structures which affects the diffusion of solutes in gels, thus mathematical models were developed to describe diffusion...
    Resource Type:
    Dissertation
    Full Text:
    . Ayres, Dr. Adel Faridani, Dr. Henri Jansen, and Dr. William W. Warren for their helpful advice and time

  • 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
    Full Text:
    beam waist (w), The thickness of the sample, the average trans- mitted power through the sample, the

  • Generation and manipulation of THz waves

    Creator:
    Amer, Naaman
    Abstract:
    In this thesis I studied several THz components that can be used for potential THz technology. THz waves were generated in nonlinear medium via optical rectification of femtosecond optical pulses. Utilizing the phase matching condition between the optical and THz waves in a ZnTe crystal, single-cycle broad-band THz pulses were...
    Resource Type:
    Dissertation
    Full Text:
    to propagate in order to lead the THz wave by one optical pulse duration and is given by optTHz w

  • Reduction in atrazine toxicity to winter wheat by the growth retardant CCC

    Creator:
    Kirkland, Kenneth
    Resource Type:
    Dissertation
    Full Text:
    instruction in its use. Drs. Larry Boersma William W. Chilcote, J. Kamm, Warren E. Kronstad, and Ralph

  • Impurities in a homogeneous electron gas

    Creator:
    Song, Jung-Hwan
    Abstract:
    Immersion energies for an impurity in a homogeneous electron gas with a uniform positive background charge density have been calculated numerically using density functional theory. The numerical aspects of this problem are very demanding and have not been properly discussed in previous work. The numerical problems are related to approximations...
    Resource Type:
    Dissertation
    Full Text:
    collaborations. I would like to express my appreciation to Professors William W. Warren, Rubin H. Landau, Tom

  • A Diels-Alder approach to biaryl synthesis

    Creator:
    Ashburn, Bradley O.
    Abstract:
    An expedient approach to the synthesis of a wide range of highly programmable biaryl templates has been accomplished. Utilizing the Diels-Alder [4+2] cycloaddition, a wide range of tri- and tetra-ortho-substituted biaryls have been synthesized in only three to four steps from commercially available materials. We have successfully synthesized entire classes...
    Resource Type:
    Dissertation
    Full Text:
    . Paul R. Blakemore, Prof. Kerry L. McPhail, and Prof. William W. Warren for their guidance. I want to

  • Heavy fermion effective mass in the superconducting vortex state

    Creator:
    Townsend, Emily A.
    Abstract:
    The extended-Lifshitz-Kosevitch formalism (ELK) unifies the treatment of the de Haas-van Alphen (dHvA) effect, allowing it to transcend its traditional roles of mapping Fermi surfaces and measuring effective masses. Here we exploit the capabilities of dHvA as a probe of many-body effects to examine heavy-fermion su- perconductivity. ELK successfully describes...
    Resource Type:
    Dissertation