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An Ising-like model to predict dielectric properties of the relaxor ferroelectric solid solution BaTiO3 - Bi(Zn1/2Ti1/2)O3, An Ising-like model to predict dielectric properties of the relaxor ferroelectric solid solution BaTiO₃ − Bi(Zn₁/₂Ti₁/₂)O₃

Creator:: Jackson, Dennis L.
Abstract:: We developed a model to investigate the dielectric properties of the BaTiO₃ − Bi(Zn₁/₂Ti₁/₂)O₃ (BT-BZT) solid solution, which is a relaxor ferroelectric and exhibits long range disorder. The model uses ab initio methods to determine all polarization states for every atomic configuration of 2 x 2 x 2 supercells of...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Dennis L. Jackson for the

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
Full Text:: approved: Glenn T. Evans The thermodynamic and structural effects of highly anisotropic, short- ranged

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
Full Text:: exceptional doctoral committee and wish to thank Dr. K. Higley, Dr. T. Palmer, Dr. L. Lucchese and Dr. H

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....
Resource Type:: Dissertation
Full Text:: oscillation causes the electrons to radiate at λl = λw 1 + ( eBwλw 2πm0c )2 2γ2 (1.1) where λl is the

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:: minimizes E[n] is the exact ground state density. The total energy functional is defined as E[n] = T [n

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
Full Text:: . An extension of the mode-matching method for characterization of microstrip right-angle bends and T

Optoelectronic properties of organic semiconductor materials : from bulk to single molecule

Creator:: Shepherd, Whitney E. B.
Abstract:: The behavior and application of organic semiconductor materials depend strongly on their molecular structure, and molecular interactions. Several studies of intermolecular interactions in functionalized polyacene materials are presented. The degree and onset of aggregation of a functionalized anthradithiophene derivative was studied as a function of concentration in two different host...
Resource Type:: Dissertation
Full Text:: of a) ADT-TES-F and b) t-bu BTBTB . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.2

Sub-diffraction light propagation and imaging in planar negative refraction waveguides

Creator:: Wangberg, Robyn
Abstract:: In this dissertation we study the electromagnetic properties of planar waveguides with non-magnetic strongly anisotropic dielectric cores. We develop an analytical description of the mode propagation in these systems and show that the index of refraction can be either positive or negative depending on the specific material parameters. Propagating modes...
Resource Type:: Dissertation
Full Text:: waveguide length. (b) The three- dimensional surface plot of ln(T ) as a function of L and din where the

Radiative Acceleration and Emission from Relativistic Outflows

Creator:: Chhotray, Atul
Abstract:: Outflowing streams of matter or jets are a common phenomenon in the observeduniverse. The most extreme and powerful jets are relativistic, i.e., they travel at speedscomparable to the of speed light. Gamma Ray-Bursts (GRBs) and Active Galactic Nuclei(AGNs) are two sources of these relativistic jets. In this work I will...
Resource Type:: Dissertation
Full Text:: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 4.3 Radiative acceleration of the layer by varying kL = Liso,S · 〈γ2L〉 (values from 1045 to 1051

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
Full Text:: = ρf (2.1) ∇ ·B = 0 (2.2) ∇× E = −∂B ∂t (2.3) ∇×H = Jf + ∂D ∂t (2.4) F = q (E + v ×B) (2.5

ScholarsArchive@OSU

An Ising-like model to predict dielectric properties of the relaxor ferroelectric solid solution BaTiO3 - Bi(Zn1/2Ti1/2)O3, An Ising-like model to predict dielectric properties of the relaxor ferroelectric solid solution BaTiO₃ − Bi(Zn₁/₂Ti₁/₂)O₃

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

Simultaneous beta/gamma digital spectroscopy

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

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

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

Optoelectronic properties of organic semiconductor materials : from bulk to single molecule

Sub-diffraction light propagation and imaging in planar negative refraction waveguides

Radiative Acceleration and Emission from Relativistic Outflows

Nonlinear terahertz spectroscopy of carbon nanomaterials and semiconductor nanostructures

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