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Filtering by: Creator Hummel, Matthias E. Remove constraint Creator: Hummel, Matthias E. Academic Affiliation Physics Remove constraint Academic Affiliation: Physics

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  • Perturbed angular correlation investigation of cubic zirconia

    Creator:
    Fuchs, Heinz D.
    Abstract:
    Perturbed angular correlation (PAC) spectra of fully yttria-stabilized (cubic) zirconia with Y₂0₃ contents of 35.4 wt. %, 27.8 wt. %, and 16.9 wt. %, respectively, were measured using the isotope ¹⁸¹Ta as probe nucleus. PAC spectra in cubic zirconia are characterized by a wide frequency distribution due to contributions of...
    Resource Type:
    Masters Thesis
    Full Text:
    . Energy barriers for motion of defects or trapping energies (E). The temperature dependence of the

  • Perturbed directional correlation in Ta-181

    Creator:
    Cannon, Theodore Wiles
    Resource Type:
    Dissertation
    Full Text:
    nucleiwhicl:emit two particles or radiations in rapid succession, The relative probability W(e)dO that the second

  • Excited state measurements in Ta-181 and Dy-161

    Creator:
    Blackburn, Wildon Charles
    Abstract:
    The g-factor of the 482 Key (Kiloelectron volt) state in Ta¹⁸¹ and the half-lives of the 25.6 Key and 74.5 Key states in Dy¹⁶¹ have been measured by the delayed coincidence method. The g-factor of the 482 Key state in Ta¹⁸¹ was determined by observing the effects of an external...
    Resource Type:
    Masters Thesis
    Full Text:
    : Perturbed angular correlations, ed. by E. Karlsson, E. Matthias, and K. Siegbahn. Amster- dam, North

  • Monte Carlo Simulations for a Soft Sphere Fluid

    Creator:
    Kreitzberg, Patrick
    Abstract:
    In this paper I present the results of Monte Carlo simulations for a soft sphere fluid with a Weeks-Chandler-Anderson (WCA) pair potential. The results are compared to Soft Fundamental Measure Theory (SFMT) results obtained by our research group. One of the research group’s goals was to show that our SFMT...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    ]. Impenetrable hard spheres are not physical as they have an infinite potential. In 2000, Matthias Schmidt

  • Incorporation of hyperfine probes into the thin-film superconductor YBa₂Cu₃O₇₋δ during deposition

    Creator:
    Tom, D. W., Platzer, R., Gardner, John A., and Tate, Janet
    Abstract:
    Radioactive In has been incorporated into oriented thin films of YBa₂Cu₃O₇₋δ during a thermal coevaporation process. The hyperfme technique of perturbed γγ-angular correlation spectroscopy shows that 60% of the indium substitutes at a single site in the superconductor. We obtain spectra with reasonable statistics from 2 mCi of starting material,...
    Resource Type:
    Article
    Full Text:
    . Steffan and H. Frauenfelder, in Perturbed Angular Correlations, edited by E. Karlsson, E. Matthias, and K

  • Perturbed directional correlation in Ta-181

    Creator:
    Sommerfeldt, Raymond Walter
    Abstract:
    The effect of a static quadrupole interaction on the 133-482 Kev gamma-gamma angular correlation in Ta-181 has been studied by the delayed coincidence method. Using a source of Hf-181 in polycrystalline hafnium metal, the anisotropy was measured as a function of time between the formation and decay of the 482...
    Resource Type:
    Dissertation
    Full Text:
    % (Energies in Ke v) 958 Ì 3/2+ O* °P e; o 01 N ,g) , ti' ti ae o O ro' M' ÿ 699 Ì 3/2

  • Classical Density Functional for the Weeks-Chandler-Andersen Soft-Sphere Repulsive Potential using Soft Fundamental Measure Theory

    Creator:
    Finster, Kirstie L.
    Abstract:
    We present a classical density functional to model the soft, repulsive potential of a Weeks-Chandler-Andersen (WCA) fluid using Soft Fundamental Measure Theory (SFMT) with temperature-dependent parameters inspired by the Barker-Henderson method. Our functional uses soft spheres to model the soft-sphere WCA potential, and gives results that are in good agreement...
    Resource Type:
    Dissertation
    Full Text:
    hard spheres with a temperature-dependent diameter, dBH given by dBH = ∫ σ 0 ( 1− e−βV (r) ) dr

  • Molecular Dynamics on REX-GECO1 Reveal Structural Features Governing Fluorescence

    Creator:
    Rozanov, Nikita
    Abstract:
    Fluorescent proteins have emerged as an essential toolset for bioimaging, creating a demand for engineering proteins with new and improved fluorescent properties. In this thesis, I explore the atomistic structure of REX-GECO1, a newly engineered protein biosensor that has unique optical properties. Since this protein has no available crystal structure,...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    simulations rely on Newtonian models for atoms and molecules to e�ciently and accurately describe large

  • Terahertz Imaging and Nonlinear Spectroscopy of Semiconductors using Plasmonic Devices

    Creator:
    Thompson, Zachary James
    Abstract:
    In this dissertation, a series of studies in the field of terahertz (THz) science are presented, specifically using nonlinear THz spectroscopy. We exploit huge field enhancement and subwavelength confinement in plasmonic structures. There are three distinct projects which will be discussed: nonlinear THz spectroscopy using plasmonic induced transparency (PIT), THz-triggered...
    Resource Type:
    Dissertation
    Full Text:
    Maxwell’s equations in matter. [25] ∇× E = −∂B ∂t (2.1) ∇×H = Jf + ∂D ∂t (2.2) ∇ ·D = ρf (2.3) ∇ ·B

  • Theory of Inhomogeneous Fluids

    Creator:
    Krebs, Eric J.
    Abstract:
    This dissertation reports on the computational physics research in the area of inhomogeneous fluids. I first discuss the theory background for this work beginning with water, which is important for the two published articles that are presented in this work (Chapters 5 and 6). Next, I give a brief overview...
    Resource Type:
    Dissertation
    Full Text:
    LIST OF FIGURES Figure Page 2.1 A phase diagram of water [1]. The circle marked “E” located in the