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  Partner: UNT Libraries
 Degree Discipline: Physics
 Degree Level: Master's
Relaxation Time Measurements for Collision Processes in the Surface Layers of Conductors and Semiconductors Near 10 Ghz

Relaxation Time Measurements for Collision Processes in the Surface Layers of Conductors and Semiconductors Near 10 Ghz

Date: December 1973
Creator: Childress, Larry Wayne
Description: This thesis represents one phase of a joint effort of research on the properties of liquids and solids. This work is concerned primarily with the microwave properties of solids. In this investigation the properties exhibited by conductor and semiconductor materials when they are subjected to electromagnetic radiation of microwave frequency are studied. The method utilized in this experiment is the perturbation of a resonant cavity produced by introduction of a cylindrically shaped sample into it.
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Microwave Line Widths of the Asymmetric Top Formic Acid Molecule

Microwave Line Widths of the Asymmetric Top Formic Acid Molecule

Date: August 1974
Creator: Maynard, Wayne R.
Description: This work consisted of an experimental investigation of the formic acid (HCOOH) molecule's rotational spectrum. Measurements of line widths were obtained for J = 5, 12, 13, 19, and 20 for a pressure range from 1 to 10 microns. A linear behavior between Av and p was observed as predicted by theory. The line width parameter Avp was observed to depend on the quantum number J. Hard sphere collision diameters b1 were calculated using the obtained AvP values. These deduced hard sphere values were found to be larger than the physical size of the molecule. This result was found to be in general agreement with other investigation in which long range forces (dipole-dipole) dominate.
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Effects of Discharge Tube Geometry on Plasma Ion Oscillations

Effects of Discharge Tube Geometry on Plasma Ion Oscillations

Date: May 1975
Creator: Simmons, David Warren
Description: This study considers the effect, on plasma ion oscillations, of various lengths of discharge tubes as well as various cross sections of discharge tubes. Four different gases were used in generating the plasma. Gas pressure and discharge voltage and current were varied to obtain a large number of signals. A historical survey is given to familiarize the reader with the field. The experimental equipment and procedure used in obtaining data is given. An analysis of the data obtained is presented along with possible explanations for the observed phenomena. Suggestions for future study are made.
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Automatic Frequency Control of Microwave Radiation Sources

Automatic Frequency Control of Microwave Radiation Sources

Date: August 1979
Creator: Payne, Bobby D.
Description: Resonant cavity controlled klystron frequency stabilization circuits and quartz-crystal oscillator frequency stabilization circuits were investigated for reflex klystrons operating at frequencies in the X-band range. The crystal oscillator circuit employed achieved better than 2 parts in 10 in frequency stability. A test of the functional properties of the frequency standard was made using the Stark effect in molecules.
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The Classical Limit of Quantum Mechanics

The Classical Limit of Quantum Mechanics

Date: December 1977
Creator: Hefley, Velton Wade
Description: The Feynman path integral formulation of quantum mechanics is a path integral representation for a propagator or probability amplitude in going between two points in space-time. The wave function is expressed in terms of an integral equation from which the Schrodinger equation can be derived. On taking the limit h — 0, the method of stationary phase can be applied and Newton's second law of motion is obtained. Also, the condition the phase vanishes leads to the Hamilton - Jacobi equation. The secondary objective of this paper is to study ways of relating quantum mechanics and classical mechanics. The Ehrenfest theorem is applied to a particle in an electromagnetic field. Expressions are found which are the hermitian Lorentz force operator, the hermitian torque operator, and the hermitian power operator.
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The Stopping Power of Amorphous and Channelled Silicon at All Energies as Computed with the Binary Encounter Approximation

The Stopping Power of Amorphous and Channelled Silicon at All Energies as Computed with the Binary Encounter Approximation

Date: December 1994
Creator: Bickel, David, 1970-
Description: This thesis utilizes the binary encounter approximation to calculate the stopping power of protons penetrating silicon. The main goal of the research was to make predictions of the stopping power of silicon for low-energy and medium-energy channelled protons, in the hope that this will motivate experiments to test the theory developed below. In attaining this goal, different stopping power theories were compared and the binary encounter approach was applied to random (non-channelled) and high-energy channelled protons in silicon, and these results were compared with experimental data.
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Gamma Ray Distribution from Neutron Excitation in Cesium

Gamma Ray Distribution from Neutron Excitation in Cesium

Date: January 1969
Creator: Bowers, Richard Morgan
Description: The purpose of this investigation was to analyze the gamma rays resulting from excitation of Cs133 by the inelastic scattering of 14 MeV neutrons and to determine the relative intensity of each gamma ray.
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Gamma Rays Resulting from Neutron Scattering in Cesium

Gamma Rays Resulting from Neutron Scattering in Cesium

Date: January 1967
Creator: McAnally, Michael A.
Description: The purpose of this investigation was to attempt to resolve the energy levels of Cs133 that can be excited by inelastic scattering of 14 Mev neutrons.
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A Study of the Celestial Gamma-ray Flux

A Study of the Celestial Gamma-ray Flux

Date: June 1967
Creator: Keath, Edwin P. (Edwin Paul),1938-
Description: This thesis is a study of the celestial gamma-ray flux. It reviews several of the proposed mechanisms for producing high energy gamma rays and describes several of the attempts to detect their presence. Also included is a short historical review of the spark chamber, along with a qualitative description of its operation.
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The Temperature Dependence of Magnetic Susceptibility of Galvinoxyl

The Temperature Dependence of Magnetic Susceptibility of Galvinoxyl

Date: January 1968
Creator: Martin, John R.
Description: The twofold purpose of this investigation was to design and construct an apparatus for direct magnetic susceptibility measurements as a function of temperature and to provide the complete susceptibility characterization of the free radical galvinoxyl in the room temperature-liquid nitrogen range.
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The Dielectric Constant of Galvinoxyl

The Dielectric Constant of Galvinoxyl

Date: May 1968
Creator: Mizell, Michael E.
Description: The molecules in many substances are know to undergo at characteristic temperatures a change in their rotational freedom in the solid state, signifying either a change in structure of the material of the onset of limited rotation of the molecule about some symmetry axis. The purpose of this research was to determine from dielectric constant measurements over the 100°K-420°K temperature range whether or not the organic free radical galvinoxyl and its diamagnetic parent molecule, dihydroxydiphenylmethane, undergo any such transitions.
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Microwave Cavity Method for Measuring Plasma Properties

Microwave Cavity Method for Measuring Plasma Properties

Date: August 1969
Creator: Freeman, Ronald H.
Description: This discussion is concerned primarily with communications blackout during spacecraft entry into a planetary atmosphere. The gas in the shock layer, between shock wave and vehicle surface, ionizes from the intense heating which takes place in the bow shock wave and a viscous region of high gas enthalpy. This ionization may persist throughout the subsequent flow over the vehicle and into the wake, thus completely engulfing the vehicle and its communications elements. The problem will be to simulate a plasma model that will be of interest for hypervelocity reentry vehicles and to provide meaningful expressions for the various plasma parameters of interest (electron density, electron temperature, collision frequency, etc.) in terms of the microwave measurables (amplitude, phase shifts, frequency shifts, polarization, etc.)
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Temperature Dependence of the Magnetic Susceptibility of the Organic Free Radical Galvinoxyl

Temperature Dependence of the Magnetic Susceptibility of the Organic Free Radical Galvinoxyl

Date: August 1965
Creator: Morphew, Sam W.
Description: This thesis examines temperature dependence of magnetic susceptibility of the organic free radical galvinoxyl.
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Design and Testing of a Corona Column and a Closed Gas Distribution System for a Tandem Van de Graaff Voltage Generator

Design and Testing of a Corona Column and a Closed Gas Distribution System for a Tandem Van de Graaff Voltage Generator

Date: June 1962
Creator: Gray, Thomas Jack
Description: The purpose of this study had been to design and test a corona column and an insulating gas distribution system for a small tandem Van de Graaff. The intent of this paper is to describe the gas handling system and to compare experimentally the effects of corona electrode shape on the corona current carried between adjacent sections of the column.
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A Microwave Spectrometer for Narrow-line Electron Spin Resonance Studies

A Microwave Spectrometer for Narrow-line Electron Spin Resonance Studies

Date: January 1966
Creator: Neie, Van ElRoy
Description: This thesis explores the basic theory, design and construction of electron spin resonance spectrometer.
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A Vacuum Tube for an Electrostatic Generator

A Vacuum Tube for an Electrostatic Generator

Date: August 1966
Creator: Pool, John Reginald
Description: The purpose of this study has been to construct two accelerating tubes with small beam apertures for the Van de Graaff, modifying the prototype tube designed and tested by Wiley (20), to design and construct a vacuum system for evacuating the tubes, and to determine the characteristics of the tube under operating conditions while installed in the generator.
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The Diurnal Variation of Cosmic Radiation

The Diurnal Variation of Cosmic Radiation

Date: August 1965
Creator: Fowler, Brooks C.
Description: The primary purpose of this investigation was to study the diurnal variation of cosmic-ray intensity.
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Nuclear Magnetic Resonance in a Crystalline Stable Free Radical--Wurster's Blue Perchlorate

Nuclear Magnetic Resonance in a Crystalline Stable Free Radical--Wurster's Blue Perchlorate

Date: August 1965
Creator: McCann, Thomas E.
Description: This thesis investigates the nuclear magnetic resonance in a crystalline stable free radical.
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Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System

Design and Testing of a Positive Ion Accelerator and Necessary Vacuum System

Date: August 1953
Creator: McKay, Vern A.
Description: This thesis is a study of the design and testing of a positive ion accelerator and necessary vacuum system.
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Antiferromagnetic Ordering in Picryl-Amino-Carbazyl

Antiferromagnetic Ordering in Picryl-Amino-Carbazyl

Date: August 1964
Creator: Porter, Wilbur A.
Description: The purpose of the experiment was to investigate other paramagnetic salts to determine whether the W. B. perchlorate type peak was more common than previously suspected. An organic salt, picryl-n-amino-carbazyl, was chosen.
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The Optimum Design of a Broad-band Helix for Use in Electron Spin Resonance

The Optimum Design of a Broad-band Helix for Use in Electron Spin Resonance

Date: June 1967
Creator: Garlow, John R.
Description: This thesis examines optimum designs for broad-band helix to be used in electron spin resonance.
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Electrical Conductivity in Thin Films

Electrical Conductivity in Thin Films

Date: May 1973
Creator: Meyer, Frederick Otto
Description: This thesis deals with electrical conductivity in thin films. Classical and quantum size effects in conductivity are discussed including some experimental evidence of quantum size effects. The component conductivity along the applied electric field of a thin film in a transverse magnetic field is developed in a density matrix method.
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Transport Phenomena in Indium Arsenide at Low Temperatures

Transport Phenomena in Indium Arsenide at Low Temperatures

Date: August 1968
Creator: Luke, Paul Jacob
Description: This thesis looks at the transport phenomena in indium arsenide at low temperatures.
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Solutions of the Equations of Radiative Transfer by an Invariant Imbedding Approach

Solutions of the Equations of Radiative Transfer by an Invariant Imbedding Approach

Date: January 1969
Creator: Adams, Charles N.
Description: This thesis is a study of the solutions of the equations of radiative transfer by an invariant imbedding approach.
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