### 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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### 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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**Permallink:**digital.library.unt.edu/ark:/67531/metadc163905/

### Application of the Wigner Formalism to a Slightly Relativistic Quantum Plasma

**Date:**August 1967

**Creator:**Harper, John H.

**Description:**A slightly relativistic fermion gas is described by the dynamical theory obtained from the Wigner distribution function. The problem is approached in a self-consistent manner including the two-body Darwin Hamiltonian. The goal is to find the departures from equilibrium and dispersion relations for wave propagation in the gas.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130850/

### Quantized Hydrodynamics

**Date:**August 1972

**Creator:**Coomer, Grant C.

**Description:**The object of this paper is to derive Landau's theory of quantized hydrodynamics from the many-particle Schroedinger equation. Landau's results are obtained, together with an additional term in the Hamiltonian.

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### Homogeneous Canonical Formalism and Relativistic Wave Equations

**Date:**January 1967

**Creator:**Jackson, Albert A.

**Description:**This thesis presents a development of classical canonical formalism and the usual transition schema to quantum dynamics. The question of transition from relativistic mechanics to relativistic quantum dynamics is answered by developing a homogeneous formalism which is relativistically invariant. Using this formalism the Klein-Gordon equation is derived as the relativistic analog of the Schroedinger equation. Using this formalism further, a method of generating other relativistic equations (with spin) is presented.

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### A Study and Critique of the Mean Position Concept in Relativistic Wave Mechanics

**Date:**January 1967

**Creator:**Gebhart, Hugh David

**Description:**The basic concept to be used in studying the question of one-particle interpretations of relativistic wave equations is that of observables and operator representations that are different from the more usual classically motivated observables and representations. In particular, the concept of a mean-position observable will be used to determine to what extent the one-particle "problems" can be resolved.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc130778/

### Emergence of Complexity from Synchronization and Cooperation

**Date:**May 2008

**Creator:**Geneston, Elvis L.

**Description:**The dynamical origin of complexity is an object of intense debate and, up to moment of writing this manuscript, no unified approach exists as to how it should be properly addressed. This research work adopts the perspective of complexity as characterized by the emergence of non-Poisson renewal processes. In particular I introduce two new complex system models, namely the two-state stochastic clocks and the integrate-and-fire stochastic neurons, and investigate its coupled dynamics in different network topologies. Based on the foundations of renewal theory, I show how complexity, as manifested by the occurrence of non-exponential distribution of events, emerges from the interaction of the units of the system. Conclusion is made on the work's applicability to explaining the dynamics of blinking nanocrystals, neuron interaction in the human brain, and synchronization processes in complex networks.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc6107/

### Brownian Movement and Quantum Computers

**Access:**Use of this item is restricted to the UNT Community.

**Date:**December 2004

**Creator:**Habel, Agnieszka

**Description:**This problem in lieu of thesis is a discussion of two topics: Brownian movement and quantum computers. Brownian movement is a physical phenomenon in which the particle velocity is constantly undergoing random fluctuations. Chapters 2, 3 and 4, describe Brownian motion from three different perspectives. The next four chapters are devoted to the subject of quantum computers, which are the signal of a new era of technology and science combined together. In the first chapter I present to a reader the two topics of my problem in lieu of thesis. In the second chapter I explain the idea of Brownian motion, its interpretation as a stochastic process and I find its distribution function. The next chapter illustrates the probabilistic picture of Brownian motion, where the statistical averages over trajectories are related to the probability distribution function. Chapter 4 shows how to derive the Langevin equation, introduced in chapter 1, using a Hamiltonian picture of a bath with infinite number of harmonic oscillators. The chapter 5 explains how the idea of quantum computers was developed and how step-by-step all the puzzles for the field of quantum computers were created. The next chapter, chapter 6, discus the basic quantum unit of information ...

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### Recombination Rate Coefficient Measurements in the Helium Afterglow

**Date:**August 1969

**Creator:**Wells, William E.

**Description:**This thesis describes a method of determining the recombination rate coefficient experimentally, which does not depend on a specific model of the recombination process. With this method established, results are presented for the recombination rate coefficient measurements at 44.6 Torr.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc131182/

### Steady-state and Dynamic Probe Characteristics in a Low-density Plasma

**Date:**December 1970

**Creator:**Bunting, William David

**Description:**The problem with which this investigation is concerned is that of determining the steady-state and dynamic characteristics of the admittance of a metallic probe immersed in a laboratory plasma which has the low electron densities and low electron temperatures characteristic of the ionospheric plasma. The problem is separated into three related topics: the design and production of the laboratory plasma, the measurement of the steady-state properties of dc and very low frequency probe admittance, and the study of transient ion sheath effects on radio frequency probe admittance.

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**Permallink:**digital.library.unt.edu/ark:/67531/metadc278232/