Browsing PhD Dissertations - DO NOT EDIT by Title
Now showing items 21-40 of 104
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DEVELOPMENT AND APPLICATIONS OF A MULTI-FUNCTIONAL POSITRON BEAM FOR SPECTROSCOPIES OF SURFACES AND INTERFACES
(2019-09-03)This dissertation describes the construction of a multi-functional positron beam and the methods employed for the analysis of digitized data produced by electron time-of-flight and gamma spectrometers. The positron beam ... -
Electroluminescent Signals and CosmogenicBackgrounds in High Pressure Xenon Gas TimeProjection Detectors
(2022-01-10)The NEXT collaboration is developing a sequence of high pressure xenon gas time projection chambers with the aim of creating a ton-scale, very low background neutrinoless double beta decay search. Finding evidence of ... -
Electron Emission From Surfaces Resulting From Low Energy Positron Bombardment
(Physics, 2009-09-16)Measurements of the secondary electron energy spectra resulting from very low energy positron bombardment of a polycrystalline Au and Cu (100) surfaces are presented that provide evidence for a single step transition from ... -
Electronic and Magnetic Properties of Metal Doped Silicon-Carbide Fullerene-type Nanostructures
(2021-12-20)Silicon carbide (SiC) is a technologically significant material. A recent report on the abundance of C60 fullerenes in interstellar space, along with the presence of SiC precursors, sparked interest in potentially similar ... -
Energy Dissipation during Geomagnetic Storms
(2021-12-20)Some fraction of the solar wind energy is transferred to the Earth magnetosphere and ionosphere. Sometimes this transfer of energy is exceptionally large, producing a magnetic storm. Storms occur when the Interplanetary ... -
Evidence Of A Positron Bound State On The Surface Of A Topological Insulator
(Physics, 2014-12)We describe experiments aimed at probing the sticking of positrons to the surfaces of topological insulators performed at university of Texas at Arlington using the Positron Annihilation induced Auger electron Spectrometer. ... -
Experimental Studies Of Fundamental Aspects Of Auger Emission Process In Cu(100) And Ag(100)
(Physics, 2014-09-17)Auger spectra at the low energies are accompanied by large contributions unrelated to the Auger transition. The Auger unrelated contributions can obscure the Auger peak and affect the quantitative analysis of the materials ... -
Exploring Numerical Simulations of Localized Geomagnetic Disturbances
(2023-05-08)One of the prominent effects of space weather is the formation of rapid geomagnetic field variations on Earth’s surface driven by the magnetosphere-ionosphere system. These Geomagnetic Disturbances (GMDs) cause Geomagnetically ... -
Fabrication Of Superparamagnetic And Ferromagnetic Nanoparticles
(Physics, 2009-09-16)Monodisperse magnetic nanoparticles with controlled size and geometry have drawn great attention in the last decade for fundamental scientific studies and for their potential applications in advanced materials and devices ... -
FACTORS THAT INFLUENCE STUDENT PERFORMANCE IN PHYSICS
(2018-04-12)This study is composed of several projects in the field of physics education research. First, Investigations into flipped physics classrooms at the senior and graduate level show that students uniformly agree that the ... -
Ferrimagnetism And Magnetic Entropy Change For TM/RE Multilayers
(Physics, 2009-09-16)Multilayers of Co/Tb, Ni/Gd, NiFe/Gd, CoFe/Gd and CoNi/Gd multilayers have been synthesized using dc magnetron sputtering and have been investigated experimentally by SQUID magnetometry. Due to the antiferromagnetic coupling ... -
First Direct Measurement Of The Energy Spectra Of Individual Auger Cascade Steps In Solid MnO, Ag And Pd
(Physics, 2007-09-17)We present the first direct measurements of energy spectra of electrons emitted in the later steps of the Auger cascade processes in solids. Measurements were carried out for the L-->MV-->VVV and L-->MM-->MVV-->VVVV Auger ... -
First Observation Of Dijet Events With An Antiproton Tag At [square root]s = 1.96 TEV Using The DØ Forward Proton Detector
(Physics, 2007-08-23)The Forward Proton Detector (FPD) is a new sub-system of the DØ detector, a 5000 ton particle physics detector located at the Fermilab Tevatron proton-antiproton collider. The FPD was implemented for the Tevatron Run II ... -
First Principles Study Of Ga-stabilized δ-Pu Bulk And Surfaces
Plutonium (Pu) metal is highly reactive toward environmental gases and corrodes at a high rate. Due to this inevitable process, containers used to store Pu-based materials may experience catastrophic failure, subsequently ... -
FIRST-PRINCIPLES STUDIES OF THE LOW DIMENSIONAL TRANSITION METAL OXIDES
(2019-08-08)Transition metal oxides have drawn lots of attention from experimental and theoretical research due to their unique physical and chemical properties. Among them, the semiconducting α-Fe2O3 and TiO2 has been investigated ... -
FIRST-PRINCIPLES STUDIES ON THE PIEZOELECTRICITY AND FERROELECTRICITY OF KNN RELATED MATERIALS
(2020-08-13)Nowadays, with the increasing environmental concerns, K1-xNaxNbO3 (KNN)-based materials have gained enormous interest and attention as one of the most promising lead-free piezoelectric materials because of their excellent ... -
First-principles Study On Hard/soft SmCo5/Co(Fe) Nanocomposite Magnetic Materials
(Physics, 2008-09-17)More than a decade ago, exchange-spring permanent magnets containing soft and hard magnetic phases have been proposed to enlarge maximum energy product values through exchange coupling between the magnetically soft and ... -
FUNCTIONALIZING SEMICONDUCTOR-CRYSTALLINE OXIDE HETEROSTRUCTURES FOR FUTURE APPLICATION IN ENERGY HARVESTING, SENSING, AND COMPUTING TECHNOLOGIES
(2019-08-26)Energy harvesting, sensing, and computing technologies utilizing conventional semiconductors have seen a plateau in their advancement for future applications. In order to address these issues, alternate materials are needed ... -
Fundamental Dynamical Equations For Two And Four-component Spinors In Galilean And Minkowski Space-time
(Physics, 2011-07-14)A search for new fundamental (Galilean and Poincaré invariant) dynamical equations for free elementary particles represented by spinor state functions is conducted in Galilean and Minkowski space-time. A dynamical ... -
GPU-based Monte Carlo Applications in Radiation Medicine
(2021-12-02)Radiation can be used to image tumor site or kill tumor cells noninvasively, playing an important role in tumor diagnosis and treatment. Because of the increasing burden that cancer brings to the society, there always ...