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The Unification of Clay and Steel in the Representation of Machined Forms From My Past
This paper discusses the author's art works, which involved the integration of clay and steal to create sculptures of pipe forms similar to the machined forms they worked with in the agriculture and oil industries. Vicente García discusses the methodology of creation and analyzes the works.
Date:
May 1993
Creator:
García, Vicente
System:
The UNT Digital Library
Like Random Piles of Debris in My Mind
In this project, I further examined my work as a fictional layering of vernacular culture within the discourse of historical art. This investigation addressed the sources of my art, both in the outside world and in the context of an inherited art tradition. I focused on the issues of the formation and function of my work as an estheticized representation of this culture.
Date:
December 1993
Creator:
Garrett, Randall D.
System:
The UNT Digital Library
Bomaki/Arashi Shibori as a Pleated Texture in Silk Used in a Garment
The purpose of this study was to use the bomaki/arashi shibori process to create three-dimensional fabric forms which could be incorporated by the design of a garment.
Date:
August 1993
Creator:
Heartsill, Jean Louise
System:
The UNT Digital Library
Recurring Images Rising Out of a State of Obscurity
Through this study I intended to analyze and determine the significance of the recurring imagery that emerged as an integral part of my compositions. Furthermore, I attempted to discern the importance and over all the effects of the small scale upon my work and determine how vital is the spontaneity that is used to obtain each composition.
Date:
May 1993
Creator:
Aberu, Nancy E. Vendrell
System:
The UNT Digital Library
A Sculptural Expression, Based on Dream-Derived Imagery, of the Preciousness of Certain Tools in a Meditative Journey
To emphasize the preciousness of these tools, I envisioned object-specific carrying cases, like a violin case or my grandmother's china cabinet. The object-specific case or cabinet is, like the tool it houses, special and singular inits utility and serves to underscore the ceremonial nature of the tool. Of all the examples of object-specific environments I've looked at, most have been constructed of fine woods; many have also been either covered or lined with various skins, silk, or velvet to reflect the preciousness of their contents.
Date:
May 1993
Creator:
Martin, Brian Scot
System:
The UNT Digital Library
In Search of Depth
In this proposed study, I hoped to discover compositional elements that once added to the work would convey my conceptual ideas. I was interested in exploring the addition of deep pictorial space and increasing the size disparity between the figures as possible solutions for injecting a level of irony and/or eluding to the subverted agenda of the content. I wanted to see if these two secondary compositional adjustments subtly conveyed not only a strategic contradiction of the art historical concept of expressionism but the numerous accepted truths in society.
Date:
December 1993
Creator:
Bhagwat, Tanya A.
System:
The UNT Digital Library
The Sculptural Creation of a New Form of Visual Awareness Concerning Predators: The Cheetah and the Wolf
The problem I have addressed this year revolves around my search for a means to visually challenge mankind's present concepts and ideology concerning the wolf and the cheetah. At the same time, it was essential that I find a way to visually challenge previous artistic interpretations of these animals. This involved the discovery of a new form of animal representation relevant to modern societies' problems concerning the future of wildlife and the significance of the predator.
Date:
August 1993
Creator:
Ballmann, Elizabeth
System:
The UNT Digital Library
The Commemoration of Womanhood Through Small Sculpture/Jewelry
The triumphs over daily conflicts correspond to monuments that commemorate specific events of my life as a woman. The monuments commemorating these events necessitated an intimate format because the events depicted deserve close personal attention. The intimate scale offers the option of being presented as a sculpture with a base that has a detachable, wearable part.
Date:
December 1993
Creator:
Scott, Michelle Milner
System:
The UNT Digital Library
Effects of Angulation and Proximity of Components in A Series
I proposed that two factors could be adjusted in a series of rings in order to achieve total control of implied movement: Proximity and angulation of components. Through careful adjustment of these two factors, I theorized that the implied motion in a ring series could be accelerated, slowed, or omitted altogether.
Date:
August 1993
Creator:
Mauldin, D. Bruce
System:
The UNT Digital Library
Loss Versus Hope: A Printmaker's Investigation
Using this conflict between death and dying versus hope and new life, I searched for an undogmatic way to convey a Christian antidote to the despair and ugliness of post modern art. The struggle was to find the imagery, format, and media combinations to express a vision, with realism and hope, for the late twentieth century, in a unique and interesting context.
Date:
December 1993
Creator:
Clevenger, Sara Lisbeth Brown
System:
The UNT Digital Library
An Exploration of Organic and Geometric Form Combined in Stone Sculpture
Dualities of all kinds exist in the world today. Being a visual artist and sculptor I recognize these dualities every day of my life in the natural and man-made forms I see. These forms can be broken down into two categories: the geometric and the organic. The purpose of this problem in lieu of thesis was to explore how organic and geometric form could be combined to create a unified sculpture in stone and how the finished sculpture affected me as a viewer. The figure was the main organic form represented and addressed in this problem.
Date:
December 1993
Creator:
Rippeon, Wesley P. D.
System:
The UNT Digital Library
Nature's Cycle: A Relationship in Fiber
The focus of my study is the utilization of fiber to create interpretations of animal skins that reflect the cycle of nature through varying degrees of multiplication and repetition of the fibers. In exploring this problem, I have addressed the following questions: 1. Which fibers work best for achieving these interpretations? 2. What problems were encountered in creating structural supports? 3. What are the effects of repeating fiber elements?
Date:
May 1993
Creator:
Silva, Oscar
System:
The UNT Digital Library
Altered Interiors and Reality: The Subtle Changes of Perception
It was my intent to find objects that were both historically symbolic and symbolic of the times we live in, and that could be melded into a nineteenth century interior where their presence would be secondary to the overall atmosphere. I wanted to incorporate objects that would function as metaphors or personal symbols as well as historical icons.
Date:
May 1993
Creator:
Fairlie, Carol Hunter
System:
The UNT Digital Library
Measurement of HO{sub x}{center_dot} production rate due to radon decay in air
Radon in indoor air may cause the exposure of the public to excessive radioactivity. Radiolysis of water vapor in indoor air due to radon decay could produce ({center_dot}OH and HO{sub 2} {center_dot}) that may convert atmospheric constituents to compounds of lower vapor pressure. These lower vapor pressure compounds might then nucleate to form new particles in the indoor atmosphere. Chemical amplification was used to determine HO{sub x}{center_dot} production rate in indoor air caused by radon decay. Average HO{sub x}{center_dot} production rate was found to be (4.31{plus_minus}0.07) {times} 10{sup 5} HO{sub x}{center_dot} per Rn decay per second (Bq) 3.4 to 55.0% at 22C. This work provided G{sub (HO{sub x}{center_dot})}-value, 7.86{plus_minus}0.13 No./100 eV in air by directly measuring [HO{sub x}{center_dot}] formed from the radiolysis procedure. This G value implies that HO{sub x}{center_dot} produced by radon decay in air might be formed by multiple processes and may be result of positive ion-molecule reactions, primary radiolysis, and radical reactions. There is no obvious relation between HO{sub x}{center_dot} production rate and relative humidity. A laser-induced fluorescence (LIF) system has been used for {center_dot}OH production rate measurement; it consists of an excimer laser, a dye laser, a frequency doubler, a gaseous fluorescence chamber, and other optical …
Date:
August 1, 1993
Creator:
Ding, Huiling
System:
The UNT Digital Library
Toward resolving model-measurement discrepancies of radon entry into houses
Analysis of the literature indicated that radon transport models significantly and consistently underpredict the advective entry into houses of soil-gas borne radon. Advective entry is the dominant mechanism resulting in high concentrations of radon indoors. My dissertation research investigated the source of the model-measurement discrepancy via carefully controlled field experiments conducted at an experimental basement located in natural soil in Ben Lomond, California. Early experiments at the structure confirmed the existence and magnitude of the model-measurement discrepancy, ensuring that it was not merely an artifact of inherently complex and poorly understood field sites. The measured soil-gas entry rate during structure depressurization was found to be an order of magnitude larger than predicted by a current three-dimensional numerical model of radon transport. The exact magnitude of the discrepancy depends on whether the arithmetic or geometric mean of the small-scale measurements of permeability is used to estimate the effective permeability of the soil. This factor is a critical empirical input to the model and was determined for the Ben Lomond site in the typical fashion using single-probe static depressorization measurements at multiple locations. The remainder of the dissertation research tests a hypothesis to explain the observed discrepancy: That soil permeability assessed using …
Date:
June 1, 1993
Creator:
Garbesi, K.
System:
The UNT Digital Library
Triple-quantum filtered NMR imaging of sodium in the human brain
In the past multiple-quantum filtered imaging of biexponential relaxation sodium-23 nuclei in the human brain has been limited by low signal to noise ratios; this thesis demonstrates that such imaging is feasible when using a modified gradient-selected triple-quantum filter at a repetition time which maximizes the signal to noise ratio. Nuclear magnetic resonance imaging of biexponential relaxation sodium-23 ({sup 23}Na) nuclei in the human brain may be useful for detecting ischemia, cancer, and pathophysiology related to manic-depression. Conventional single-quantum NMR imaging of in vivo biexponential relaxation {sup 23}Na signals is complicated by the presence of single-exponential relaxation {sup 23}Na signals. Multiple-quantum filters may be used to selectively image biexponential relaxation {sup 23}Na signals since these filters suppress single-exponential relaxation {sup 23}Na signals. In this thesis, the typical repetition times (200--300 ms) used for in vivo multiple-quantum filtered {sup 23}Na experiments are shown to be approximately 5 times greater than the optimal repetition time which maximizes multiple-quantum filtered SNR. Calculations and experimental verification show that the gradient-selected triple-quantum (GS3Q) filtered SNR for {sup 23}Na in a 4% agarose gel increases by a factor of two as the repetition time decreases from 300 ms to 55 ms. The measured relaxation times of …
Date:
April 1, 1993
Creator:
Keltner, J. R.
System:
The UNT Digital Library
The Mirrortron experiment: A proof of principle test for a method of generating high transient potentials
The Mirrortron is a concept in which heavy ions are accelerated by a large local transient space potential that is produced in a hot electron plasma. The purpose of this experiment is to begin a proof of principle experiment to investigate the feasibility of producing this space potential and its associated electric field. If a large magnetic field is suddenly generated in a hot electron plasma with a loss-cone distribution, then potentials on the order of the electron temperature are expected. This potential lasts a few tens of nanoseconds. The investigation begins with a theoretical analysis of this phenomenon giving the space potential as a function of the applied magnetic field. The theory is further extended to cases of relativistic electron distributions. This is then followed by design work on a mirror confinement system for hot electrons. In this experiment a 50--100 keV electron temperature plasma is created with electron cyclotron resonance heating using two frequencies of relatively low microwave power. The microwaves are coupled to resonant frequencies of the vacuum chamber. The volume averaged plasma density is measured to be in the 10{sup 9} cm{sup {minus}3} range. A strap coil and a flat Blumlein transmission line pulse generator were …
Date:
September 1, 1993
Creator:
Douglass, S. R.
System:
The UNT Digital Library
Integrating Total Quality Management (TQM) and hazardous waste management
The Resource Conservation and Recovery Act (RCRA) of 1976 and its subsequent amendments have had a dramatic impact on hazardous waste management for business and industry. The complexity of this law and the penalties for noncompliance have made it one of the most challenging regulatory programs undertaken by the Environmental Protection Agency (EPA). The fundamentals of RCRA include ``cradle to grave`` management of hazardous waste, covering generators, transporters, and treatment, storage, and disposal facilities. The regulations also address extensive definitions and listing/identification mechanisms for hazardous waste along with a tracking system. Treatment is favored over disposal and emphasis is on ``front-end`` treatment such as waste minimization and pollution prevention. A study of large corporations such as Xerox, 3M, and Dow Chemical, as well as the public sector, has shown that well known and successful hazardous waste management programs emphasize pollution prevention and employment of techniques such as proactive environmental management, environmentally conscious manufacturing, and source reduction. Nearly all successful hazardous waste programs include some aspects of Total Quality Management, which begins with a strong commitment from top management. Hazardous waste management at the Rocky Flats Plant is further complicated by the dominance of ``mixed waste`` at the facility. The mixed …
Date:
November 1, 1993
Creator:
Kirk, N.
System:
The UNT Digital Library
Application of an Electrochemical Quartz Crystal Microbalance to the study of electrocatalytic films
The EQCM was used to study the deposition and composition of electrodeposited pure PbO{sub 2} and Bi-doped PbO{sub 2} active toward anodic oxygen-transfer reactions. Within the doped films, Bi is incorporated as Bi{sup +5} in the form of BiO{sub 2}A, where A is ClO{sub 4}{sup {minus}} or NO{sub 3}{sup {minus}}. For deposition of these 2 materials, changes in hydration between the Au oxide and the depositing film resulted in higher mass-to-charge ratios. XRD and XPS were used to study the films; the rutile structure of PbO{sub 2} is retained even with the Bi doping. The EQCM was also used to study the formation and dissolution of Au oxide and preoxide structures formed on the Au substrate electrodes in acidic media. The preoxide structures were AuOH and increased the surface mass. For the formation of stable Au films on quartz wafers, Ti interlayers between Au and quartz was found to be very effective.
Date:
September 1, 1993
Creator:
Gordon, J. S., Jr.
System:
The UNT Digital Library
High-resolution soft x-ray photoionization studies of selected molecules
Near-edge soft x-ray photoionization spectra were measured for CO, SF{sub 6}, H{sub 2}S, and D{sub 2}S in the gas phase, using the Free University of Berlin plane-grating SX-700-II monochromator at the synchrotron radiation source BESSY. Photoionization spectra of carbon monoxide were measured near the carbon and oxygen K edges. Vibrational spacings and bond lengths are derived for several resonances. Results are consistent with equivalent-core model and indicate the different influences of the carbon and oxygen Is core holes. Corresponding spectra of H{sub 2}CO and D{sub 2}CO were also measured. Assignment of complex vibrational structure in valence-shell and Rydberg resonances is facilitated by comparison of spectra for the two isotopic species. Geometric and vibrational parameters are derived for several carbon 1s core-excited states. Isotopic shifts are observed in the energies and linewidths of some core-excited states. Sulfur hexafluoride photoionization spectra, measured near the sulfur L{sub 2,3} edges, show several series of weak, narrow Rydberg resonances. High resolution and good counting statistics allow a complete assignment of these states. Lineshapes of the broad inner-well resonances are analyzed to establish the magnitudes of vibrational and lifetime broadening in these states. Spectra of the H{sub 2}S and D{sub 2}S molecules were also measured near …
Date:
August 1, 1993
Creator:
Hudson, E. A.
System:
The UNT Digital Library
Density functional studies: First principles and semi-emperical calculations of clusters and surfaces
Theoretical electronic structure techniques are used to analyze widely different systems from Si clusters to transition metal solids and surfaces. For the Si clusters, first principles density functional methods are used to investigate Si{sub N} for N=2-8. Goal is to understand the different types of bonding that can occur in such small clusters where the atomic coordination differs substantially from tetrahedral bonding; such uncoordinated structures can test approximate models of Si surfaces. For the transition metal systems, non-self-consistent electronic structure methods are used to understand the driving force for surface relaxations. In-depth analysis of results is presented and physical basis of surface relaxation within the theory is discussed. Limitations inherent in calculations of metal surface relaxation are addressed. Finally, in an effort to understand approximate methods, a novel non-self- consistent density functional electronic structure method is developed that is about 1000 times faster than more sophisticated methods; this method is tested for various systems including diatomics, mixed clusters, surfaces, and bulk lattices.
Date:
April 30, 1993
Creator:
Susan, S.
System:
The UNT Digital Library
Sulfur-bonded thiophenes in organometallic rhenium complexes and adsorption of isocyanides on gold
This dissertation contains results of research conducted in two different areas: (1) organometallic synthesis and reactivity, and (2) organometallic surface chemistry. In the synthesis and reactivity studies, sulfur coordination of thiophene and benzo[b]thiophene to the metal center in organometallic rhenium complexes is examined. In the surface chemistry studies, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is used to analyze the adsorption of several isocyanides on the surface of gold powder. Results are compared and contrasted to known organometallic chemistry.
Date:
August 1, 1993
Creator:
Robertson, M. J.
System:
The UNT Digital Library
CCM Continuity Constraint Method: A finite-element computational fluid dynamics algorithm for incompressible Navier-Stokes fluid flows
As the field of computational fluid dynamics (CFD) continues to mature, algorithms are required to exploit the most recent advances in approximation theory, numerical mathematics, computing architectures, and hardware. Meeting this requirement is particularly challenging in incompressible fluid mechanics, where primitive-variable CFD formulations that are robust, while also accurate and efficient in three dimensions, remain an elusive goal. This dissertation asserts that one key to accomplishing this goal is recognition of the dual role assumed by the pressure, i.e., a mechanism for instantaneously enforcing conservation of mass and a force in the mechanical balance law for conservation of momentum. Proving this assertion has motivated the development of a new, primitive-variable, incompressible, CFD algorithm called the Continuity Constraint Method (CCM). The theoretical basis for the CCM consists of a finite-element spatial semi-discretization of a Galerkin weak statement, equal-order interpolation for all state-variables, a 0-implicit time-integration scheme, and a quasi-Newton iterative procedure extended by a Taylor Weak Statement (TWS) formulation for dispersion error control. Original contributions to algorithmic theory include: (a) formulation of the unsteady evolution of the divergence error, (b) investigation of the role of non-smoothness in the discretized continuity-constraint function, (c) development of a uniformly H{sup 1} Galerkin weak statement …
Date:
September 1, 1993
Creator:
Williams, P. T.
System:
The UNT Digital Library
Thermocapillary and arc phenomena in stainless steel welds
Goal was to study effect of power level and distribution on thermocapiilary-induced weld shape and of arc factors on weld shape. Thermocapillarity was apparent in both conduction mode EB welds and GTA welds, particularly in the former. A non-Gaussian arc distribution is suggested for accounting for the differences between the twoss processes. At higher current levels (200--300 A), plasma shear force also contributes to weld shape development. Evidence suggests that thermocapillary flow reversal is not a factor in normal GTA welds; EDB flow reversal occurs only at high power density levels where the keyhole mode is present.
Date:
October 1, 1993
Creator:
Pierce, S. W.
System:
The UNT Digital Library