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  • Evaluation of Materials for Use in Open-Cycle Magnetohydrodynamic Power Generation

    Creator:
    Bowen, Michael S.
    Abstract:
    Recent interest in oxy-fuel combustion for carbon capture, as well as advancements in technologies such as magnetics, materials, and computational modeling has sparked renewed interest in magnetohydrodynamic (MHD) power generation. The increased temperatures of oxy-fuel combustion versus air-fuel combustion poses a challenge in the selection of materials for plasma exposed...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________________________________ David P. Cann C. Rigel Woodside Abstract: Recent interest in oxy-fuel combustion for carbon

  • High Temperature Electrical Properties of Ceria-Based Ceramics for Use as Electrodes in Magnetohydrodynamic Power Generators

    Creator:
    Bowen, Michael S.
    Abstract:
    Determining the electrical properties of ceria-based materials is important for their use as electrodes in hot-wall magnetohydrodynamic (MHD) power generators with wall temperatures greater than 1500 ̊C. The electrical conductivity of a material can be used in models for predicting the performance of generator designs. More specifically, the temperature dependent...
    Resource Type:
    Dissertation
    Full Text:
    THE TEMPERATURE RANGE OF 150˚C TO 1000˚C COMPARED TO THE FITTING IN A) PLOTTED AS A DASHED BLACK

  • Isolating Non-Blackbody Radiation Spectra from Low-Bandgap LEDs near Zero Bias

    Creator:
    Teo, YiPeng
    Abstract:
    The study of carrier transport in light-emitting diode (LED) has been researched extensively in the past. However, most studies were implementing voltages above the turn-on voltage of the LED. Research on LEDs well below the turn-on voltage threshold is comparatively scarce for good reasons. When the supply voltage is below...
    Resource Type:
    Honors College Thesis
    Full Text:
    carrier recombination within the semiconductor is exponentially suppressed. There also exists black body

  • Structure-property relationships in oxides containing tellurium

    Creator:
    Siritanon, Theeranun
    Abstract:
    Oxides of post-transition metals often show unique structures and properties due to the presence of lone pair electrons and the diffused s orbitals. The present work focuses on synthesis and characterizations of oxides containing Te, a heavy post transition metal. New series of pyrochlore oxides of the formula Cs(M,Te)₂O₆ (M...
    Resource Type:
    Dissertation
    Full Text:
    (ranging from black to dark green) indicating a possible mixed valency for Te with appreciable charge

  • Development of oxide semiconductors : materials, devices, and integration

    Creator:
    Chiang, Hai Q.
    Abstract:
    The aim of this dissertation is to develop oxide semiconductors by radio-frequency sputtering for thin-film transistor (TFT) applications. A variety of oxide semiconductors are used as the TFT channel layer, including indium gallium oxide (IGO), zinc tin oxide (ZTO), and indium gallium zinc oxide (IGZO). The variety of materials used...
    Resource Type:
    Dissertation
    Full Text:
    electrical properties, even when annealedat low-temperature (175◦C). Specifically, ZTO-based TFTs which are

  • 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
    Full Text:
    calculated using the Bethe-Salpeter equation in the GW approxi- mation. c©Copyright by Jason Michael

  • Bi-based perovskite solid solutions for high energy density thin films

    Creator:
    Emerson, Morgan Rose
    Abstract:
    Electrical energy storage devices are currently the main limiting factor in many electrical devices and with the increasing demands placed on electrical power over fossil fuels, high energy density materials are essential. Previous research by Huang et al. on bulk (1-x)Bi(Zn₁/₂Ti₁/₂)O₃-xABO₃ solid solution systems led to the discovery of an...
    Resource Type:
    Masters Thesis
    Full Text:
    loss tangents (tan δ<0.01) up to high temperatures (T>400 °C). Most notably, these high dielectric

  • First principles studies of optical, electronic and mechanical properties of organic molecules and solids

    Creator:
    Barras, Faye Lyn
    Abstract:
    This thesis presents the results of quantum-mechanical first principles calculations of optical, electronic and mechanical properties of organic molecules and solids, which have diverse potential applications such as photovoltaics, flexible electronics, and mechanical catalysts with applications in force sensors and self-healing materials. The electronic and optoelectronic properties of organic thin...
    Resource Type:
    Dissertation
    Full Text:
    results. c©Copyright by Faye Lyn Barras June 12, 2014 All Rights Reserved First Principles Studies

  • Structure-property Relationships of Transition Metal Oxides Containing Precious Metals

    Creator:
    Hapuraja Pathirannehelage, Vidhara H. P.
    Abstract:
    This dissertation presents a study of structure-property relationships within 3d/4d metal oxides containing precious metals through detailed structure refinements using high-resolution neutron and X-ray diffraction data along with exploration of the resultant properties. Oxides of 4d or 5d transition metals tend to show new topological phases due to significant spin-orbit...
    Resource Type:
    Dissertation
    Full Text:
    the compound showed its stability up to 730 ̊C in oxygen. Magnetic data shows a substantial

  • On the photoresponse of several novel oligoacene and anthradithiophene derivatives

    Creator:
    Day, Jonathan
    Abstract:
    The results of an investigation into carrier dynamics in several novel functionalized and solution-processable pentacene and anthradithiophene derivatives are reported. Measurements were made of real-time photoresponse of polycrystalline thin films of these materials to ultrafast laser pulses, on picosecond to microsecond time-scales, as well as measurements of dark current and...
    Resource Type:
    Dissertation
    Full Text:
    thin film between different electrodes. c© Copyright Jonathan Day June 20, 2008 All Rights