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open access

A Compton scatter camera for spectral imaging of 0.5 to 3.0 MeV gamma rays

Description: A prototype Compton scatter camera for imaging gamma rays has been built and tested. This camera addresses unique aspects of gamma-ray imaging at nuclear industrial sites, including gamma-ray energies in the 0.5 to 3.0 MeV range and polychromatic fields. Analytic models of camera efficiency, resolution and contaminating events are developed. The response of the camera bears strong similarity to emission computed tomography devices used in nuclear medicine. A direct Fourier based algorithm is de… more
Date: December 31, 1994
Creator: Martin, J.B.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of low-level radioactive waste characterization and classification programs of the West Valley Demonstration Project

Description: The West Valley Demonstration Project (WVDP) is preparing to upgrade their low-level radioactive waste (LLW) characterization and classification program. This thesis describes a survey study of three other DOE sites conducted in support of this effort. The LLW characterization/classification programs of Oak Ridge National Laboratory, Savannah River Site, and Idaho National Engineering Laboratory were critically evaluated. The evaluation was accomplished through tours of each site facility and p… more
Date: December 31, 1994
Creator: Taie, K.R.
Partner: UNT Libraries Government Documents Department
open access

An experimental study of fluidelastic instability and draf force on a tube in two-phase cross flow

Description: Two-phase cross flow over heat exchanger tubes creates vibrations which contribute greatly to the wear on the tubes. Fluidelastic instability is a major mechanism by which tubes can fail. In this work, the fluidelastic instability of a tube placed in an array subjected to two-phase cross flow has been studied. For the determination of fluidelastic instability, a triangular tube array was used. The tubes were made of acrylic and were 2.2 cm or 2.37 cm in diameter and 20 cm in length. Eighteen tu… more
Date: December 31, 1994
Creator: Joo, Youngcheol
Partner: UNT Libraries Government Documents Department
open access

Further studies of the effects of oxidation on the surface properties of coal and coal pyrite

Description: The objective of this research was to investigate the oxidation behavior of coal and coal pyrite and to correlate the changes in the surface properties induced by oxidation, along with the intrinsic physical and chemical properties of these organic and inorganic materials, with the behavior in physical coal cleaning processes. This provide more fundamental knowledge for understanding the way in which different factors interact in a medium as heterogeneous as coal. Fourteen coal samples of diffe… more
Date: December 31, 1994
Creator: Herrera, Miguel Nicholas
Partner: UNT Libraries Government Documents Department
open access

Measurements of granular flow dynamics with high speed digital images

Description: The flow of granular materials is common to many industrial processes. This dissertation suggests and validates image processing algorithms applied to high speed digital images to measure the dynamics (velocity, temperature and volume fraction) of dry granular solids flowing down an inclined chute under the action of gravity. Glass and acrylic particles have been used as granular solids in the experiment. One technique utilizes block matching for spatially averaged velocity measurements of the … more
Date: December 31, 1994
Creator: Lee, J.
Partner: UNT Libraries Government Documents Department
open access

Modeling the effects of atmospheric emissions on groundwater composition

Description: A composite model of atmospheric, unsaturated and groundwater transport is developed to evaluate the processes determining the distribution of atmospherically derived contaminants in groundwater systems and to test the sensitivity of simulated contaminant concentrations to input parameters and model linkages. One application is to screen specific atmospheric emissions for their potential in determining groundwater age. Temporal changes in atmospheric emissions could provide a recognizable patte… more
Date: December 31, 1994
Creator: Brown, T. J.
Partner: UNT Libraries Government Documents Department
open access

Plasma destruction of North Carolina`s hazardous waste based on hazardous waste generated between the years of 1989 and 1992

Description: The purpose of this research is to analyze the applicability of the plasma waste destruction technology to North Carolina hazardous waste streams. This study outlines the current regulations, existing technologies, and innovative technologies being considered as hazardous waste treatment alternatives. From this foundation, the study proceeds to identify the superiority of the plasma waste destruction technology. Specific areas of discussion include: temperature capabilities, waste residence tim… more
Date: December 31, 1994
Creator: Williams, D.L.
Partner: UNT Libraries Government Documents Department
open access

{sup 222}Rn in water: A comparison of two sample collection methods and two sample transport methods, and the determination of temporal variation in North Carolina ground water

Description: Objectives of this field experiment were: (1) determine whether there was a statistically significant difference between the radon concentrations of samples collected by EPA`s standard method, using a syringe, and an alternative, slow-flow method; (2) determine whether there was a statistically significant difference between the measured radon concentrations of samples mailed vs samples not mailed; and (3) determine whether there was a temporal variation of water radon concentration over a 7-mo… more
Date: December 31, 1994
Creator: Hightower, J. H., III
Partner: UNT Libraries Government Documents Department
open access

Analysis of dynamic testing performed on structural clay tile infilled frames

Description: The behavior of two structural clay tile infilled frames subjected to dynamic loading is investigated. The testing was performed by USACERL using a biaxial shake table machine on which two framed infills were spaced nine feet apart and connected by steel trusses and an eight inch concrete roof slab. The infills were composed of structural clay tile block which were laid with the cores horizontal. The specimen was loaded in both the out-of-plane and in-plane directions using a site specific time… more
Date: December 18, 1994
Creator: Fowler, J. J.
Partner: UNT Libraries Government Documents Department
open access

Differential geometry on Hopf algebras and quantum groups

Description: The differential geometry on a Hopf algebra is constructed, by using the basic axioms of Hopf algebras and noncommutative differential geometry. The space of generalized derivations on a Hopf algebra of functions is presented via the smash product, and used to define and discuss quantum Lie algebras and their properties. The Cartan calculus of the exterior derivative, Lie derivative, and inner derivation is found for both the universal and general differential calculi of an arbitrary Hopf algeb… more
Date: December 15, 1994
Creator: Watts, P.
Partner: UNT Libraries Government Documents Department
open access

Accelerator Mass Spectrometry Studies of Highly Charged Molecular Ions

Description: The existence of singly, doubly, and triply charged diatomic molecular ions was observed by using an Accelerator Mass Spectrometry (AMS) technique. The mean lifetimes of 3 MeV boron diatomic molecular ions were measured. No isotopic effects on the mean lifetimes of boron diatomic molecules were observed for charge state 3+. Also, the mean lifetime of SiF^3+ was measured.
Date: December 1994
Creator: Kim, Yong-Dal
Partner: UNT Libraries
open access

Accounting Measurement Bias and Executive Compensation Systems

Description: This dissertation presents empirical evidence intended to help answer two research questions. The first question asks whether executive compensation systems appear to exploit the bias in accounting-based performance measures in order to reduce the volatility in executive compensation and to allocate incentives more effectively across the range of activities performed by the executive. The second question asks whether compensation systems systematically differ between firms that use alternative … more
Date: December 1994
Creator: Boone, Jeffery Paul
Partner: UNT Libraries
open access

Actinide cation-cation complexes

Description: The +5 oxidation state of U, Np, Pu, and Am is a linear dioxo cation (AnO{sub 2}{sup +}) with a formal charge of +1. These cations form complexes with a variety of other cations, including actinide cations. Other oxidation states of actinides do not form these cation-cation complexes with any cation other than AnO{sub 2}{sup +}; therefore, cation-cation complexes indicate something unique about AnO{sub 2}{sup +} cations compared to actinide cations in general. The first cation-cation complex, N… more
Date: December 1994
Creator: Stoyer, N. J. & Seaborg, G. T.
Partner: UNT Libraries Government Documents Department
open access

Addition, Omission and Revision: the Stylistic Changes Made to Zehn Variationen über ein Präludium von Chopin by Ferruccio Busoni

Description: This study examines what Busoni meant by "formal deficiencies" when he described his 1884 version of Chopin Variations, and reveals that changes made to the 1884 version during its process of revision in 1922 correct the "formal deficiencies" and show a fundamental change in Busoni's compositional style and perception of musical motion. Including a detailed analysis of the modifications, omissions, and additions made to the 1922 version (including an examination of the Chopin Prelude in C minor… more
Date: December 1994
Creator: Yoon, Soomee
Partner: UNT Libraries
open access

Adult Survivors of Childhood Sexual Abuse : Characteristics of the Mother-child Relationship

Description: This qualitative study examined the characteristics of the mother-child relationship of adult survivors of childhood sexual abuse at the time of the abuse. The study consisted of data from the McMaster Family Assessment Device (FAD), the Family of Origin Scale (FOS), and a set of structured interview questions designed by the researcher. Autonomy/intimacy concepts from the FOS examined constructs of clarity of expression, responsibility, respect, openness, acceptance of loss and separation, exp… more
Date: December 1994
Creator: Motley, Rebecca Roper
Partner: UNT Libraries
open access

Advanced far infrared detector and double donor studies in Ge

Description: This has application to astronomy and astrophysics. Selenium in Ge has been studied with a doping technique which limits complex formation. Only one ionization level has been found to correspond to selenium, which presumably occupies a substitutional site. This level is extremely unstable and its concentration decreases after annealing at 400C. Future work is planned to anneal the fast neutron damage before much selenium has formed in the {sup 74/76}Ge samples. It is expected that the observed … more
Date: December 1, 1994
Creator: Olsen, C.S.
Partner: UNT Libraries Government Documents Department
open access

An Analysis of the Management and Leadership Development Training Needs of Texas Principals on the Texas State Board of Education's Core Curriculum

Description: The problem of this study was to determine training priorities as mandated by the Texas Legislature on the CORE Curriculum for Management and Leadership Development and their implications for Texas public school principals. Purposes of the study were to validate an instrument for assessing principals' training needs, to provide data for planning and delivering training for principals, to provide results to staff developers, and to develop a profile of similarities and differences in the percept… more
Date: December 1994
Creator: Morris, Amelia Marie
Partner: UNT Libraries
open access

An Application of Grundgestalt Theory in the Late Chromatic Music of Chopin: a Study of his Last Three Polonaises

Description: The late chromatic music of Chopin is often difficult to analyze, particularly with a system of Roman numerals. The study examines Schoenberg's Grundgestalt concept as a strategy for explaining Chopin's chromatic musical style. Two short Chopin works, Nocturne in E-flat major. Op. 9, No. 2, and Etude in E major, Op. 10, No. 3, serve as models in which the analytic method is formulated. Root analysis, in the manner of eighteenth-century theorist Simon Sechter, is utilized to facilitate harmonic … more
Date: December 1994
Creator: Spicer, Mark Joseph
Partner: UNT Libraries
open access

The Application of Statistical Classification to Business Failure Prediction

Description: Bankruptcy is a costly event. Holders of publicly traded securities can rely on security prices to reflect their risk. Other stakeholders have no such mechanism. Hence, methods for accurately forecasting bankruptcy would be valuable to them. A large body of literature has arisen on bankruptcy forecasting with statistical classification since Beaver (1967) and Altman (1968). Reported total error rates typically are 10%-20%, suggesting that these models reveal information which otherwise is unava… more
Date: December 1994
Creator: Haensly, Paul J.
Partner: UNT Libraries
open access

An Assessment of Employee Satisfaction within a Major Unit of a Worldwide Hotel and Resort Management Company

Description: The purpose of this study was to assess the satisfaction level of 240 employees of a single hotel property. The questionnaire, administered by the Corporate Director of Training, determined if a significant difference exists between overall satisfaction and individual departmental satisfaction regarding 11 dimensions: customer satisfaction, employee involvement/teamwork, work environment, training/development/evaluation, communication, compensation/benefits, supervision, resources, planning/goa… more
Date: December 1994
Creator: Aranson, Anne (Anne Elizabeth)
Partner: UNT Libraries
open access

Assimilation of Baroque and Classical Essence with Romantic Sentiment: a Structural Analysis of Felix Mendelssohn-Bartholdy's Sonata in C Minor for Organ, Opus 62, No. 2

Description: The purpose of this study is to examine Sonata No. 2 in detail from many analytical perspectives including melodies, rhythms, harmonic progressions, tonal plans, voice leading, and cadential patterns on macro- and micro-levels. It is believed that a more in-depth discussion of the composition from the perspective of harmony and voice leading may provide answer for the questions raised, and correct some misinterpretations in the works of certain writers. Furthermore, through analysis of Sonata N… more
Date: December 1994
Creator: Chou, Kwong-Yan Godwin
Partner: UNT Libraries
open access

Attenuation of Escherichia Coli Aspartate Transcarbamoylase Expressed in Pseudomonas Aeruginosa Mutant and Wild Type Strains

Description: No apparent repression of pyr gene expression in Pseudomonas aeruginosa is observed upon addition of exogenous pyrimidines to the growth medium. Upon introduction of the subcloned Escherichia coli pyrBI genes for aspartate transcarbamoylase (ATCase) into a P. aeruginosa pyrB mutant strain, repression was observed in response to exogenously fed pyrimidine compounds. The results proved that it is possible to bring about changes in pyrimidine nucleotide pool levels and changes in transcriptional r… more
Date: December 1994
Creator: Liu, Haiyan, 1966-
Partner: UNT Libraries
open access

Booker T. Washington and the Myth of Accommodation

Description: Since his rise to fame in the late nineteenth century, Booker T. Washington has been incorrectly labeled a compromiser and power-hungry politician who sacrificed social progress for his own advancement. Through extensive research of Washington's personal papers, speeches, and affiliations, it has become apparent that the typical characterizations of Washington are not based exclusively in fact. The paper opens with an overview of Washington's philosophy, followed by a discussion of Washington's… more
Date: December 1994
Creator: Brennan, Douglas C. (Douglas Carl)
Partner: UNT Libraries
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