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Filtering by: Creator Choephel, T. K. Remove constraint Creator: Choephel, T. K. Committee Member Jansen, Henri Remove constraint Committee Member: Jansen, Henri Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • A theoretical description of anisotropic chemical association and its application to hydrogen-bonded fluids

    Creator:
    Peery, Travis B.
    Abstract:
    The thermodynamic and structural effects of highly anisotropic, short-ranged attraction are investigated for single- and four-site interaction models using Wertheim's multi-density graph theory of chemical association. Both models consist of associating hard spheres, where the saturable attraction sites are described by conical wells centered in the hard core and evaluated...
    Resource Type:
    Dissertation
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    ............................................... 28 5.1 Critical packing fractions and temperatures T derived through virial, TPT, and S(k) and c(r

  • 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
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    the estimation of diffusion and mass transfer coefficients AN ABSTRACT OF THE THESIS OF Shawna K

  • Simultaneous beta/gamma digital spectroscopy

    Creator:
    Farsoni, Abdollah T.
    Abstract:
    A state-of-the-art radiation detection system for simultaneous spectroscopy of beta-particles and gamma-rays has been developed. The system utilizes a triplelayer phoswich detector and a customized Digital Pulse Processor (DPP) built in our laboratory. The DPP board was designed to digitally capture the analog signal pulses and, following several digital preprocessing...
    Resource Type:
    Dissertation
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    exceptional doctoral committee and wish to thank Dr. K. Higley, Dr. T. Palmer, Dr. L. Lucchese and Dr. H

  • Generalized modal analysis of electromagnetic- and quantum-waveguide structures and discontinuities

    Creator:
    Weisshaar, Andreas
    Abstract:
    Generalized modal analysis techniques for the characterization and modeling of dissipationless planar waveguide structures and discontinuities encountered in microwave and optical integrated circuits, as well as of quantum waveguide structures and devices, are presented. The frequency-dependent transmission properties of the curved microstrip bend are derived by utilizing a second-order perturbation...
    Resource Type:
    Dissertation
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    . An extension of the mode-matching method for characterization of microstrip right-angle bends and T

  • Optical, electronic, and thermodynamic properties of layered mixed anion compounds

    Creator:
    Vielma, Jason Michael
    Abstract:
    Mixed anion compounds that form ZrCuSiAs-type crystal structures exhibit remarkable properties such as superconductivity at low temperatures, hole conduction with optical transparency in the visible region, and exciton absorption at room temperature. In this thesis, properties of a selected group of materials out of the very large set of mixed...
    Resource Type:
    Dissertation
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    investigated by computational first principles methods. The discovery of superconductivity in LaFePO (TC ∼ 4 K

  • Terahertz Induced Non-linear Electron Dynamics in Nanoantenna Coated Semiconductors at the Sub-picosecond Timescale

    Creator:
    Stickel, Andrew
    Abstract:
    This dissertation is an exploration of the material response to Terahertz (THz) radiation. Specifically we will explore the ultrafast electron dynamics in the nonperturbative regime in semiconductors that have been patterned with nanoantenna arrays using broadband, high intensity, THz radiation. Three main semiconductor materials will be studied in this work....
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    Dissertation
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    , t) = ~E0e i(~k·~x−ωt) (2.24) ~B (~x, t) = ~B0e i(~k·~x−ωt) (2.25) plugging equations 2.24 and 2.25

  • Discrete-time quantum walks via interchange framework and memory in quantum evolution

    Creator:
    Dimcovic, Zlatko
    Abstract:
    One of the newer and rapidly developing approaches in quantum computing is based on "quantum walks," which are quantum processes on discrete space that evolve in either discrete or continuous time and are characterized by mixing of components at each step. The idea emerged in analogy with the classical random...
    Resource Type:
    Dissertation
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    described by the first-order, linear differential equation dpj(t) dt = γ ∑ k Ljk pk(t) , (1.2) where pj

  • Monte Carlo simulations of magnetic semiconducting Superlattices

    Creator:
    Scott, Silas Menlo
    Abstract:
    Computer simulations invoking the Metropolis Algorithm and Monte Carlo techniques were constructed to model the behavior ofvarious systems of magnetic semiconductors. Among the systems modeled were bulk type II FCC antiferromagnets and simple cubic thin films and superlattices. Studies of bulk antiferromagnets revealed dependence of Neel Temperature on nearest neighbor...
    Resource Type:
    Dissertation
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    absence of an external field at temperatures near T to be proportional to (T-T)"2 while experimentally it

  • Modeling Flow and Transport at Pore Scale with Obstructions

    Creator:
    Umhoefer, Joseph G.
    Abstract:
    In this thesis we study mathematical and computational models for phenomena of flow and transport in porous media in the presence of changing pore scale geometries. The differential equations for the flow and transport models at Darcy scale involve the coefficients of permeability, porosity, and tortuosity which depend on the...
    Resource Type:
    Dissertation
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    ) Solutions, ψ(x, t) to (5.3.2) in 5.3.1. (d) Solution, ψ(x) to (5.2.3), in 5.2.1

  • Nonlinear terahertz spectroscopy of carbon nanomaterials and semiconductor nanostructures

    Creator:
    Paul, Michael Jason
    Abstract:
    This thesis will cover my work relating to the developing field of terahertz (THz) science and technology. It will present experimental and theoretical studies investigating the optical and electrical properties of various material systems using novel THz imaging and spectroscopy techniques. Due to its low photon energy, THz imaging and...
    Resource Type:
    Dissertation
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    (1) (ωj)x (1)ξ (ωk) e −i(ωj±ωk)t + c.c. (2.74) where β = 1 for SHG and β = 2 for SFG, DFG, OR, and