UNT Theses and Dissertations - 2,719 Matching Results

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Solution Studies of ⁶Li Enriched Organolithium Compounds Using New NMR Techniques

Description: With the values of 6Li T1 measured and the literature values of J(13C-6Li) for these compounds, three new 13C NMR techniques are developed for the analysis of organolithium compounds. Modifications to the spectrometer are discussed, as well as calibrations of the 6Li decoupler channel needed to set up these new experiments. The theoretical development of each technique is presented, as well as data from their verification, using organolithium compounds of known structure. Once qualified, the ne… more
Date: May 1990
Creator: Ellington, Donald H. (Donald Howard)
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Solution Studies of the Structures and Stability of Mixed Lithium Alkoxide/Alkvllithium Aggregates

Description: New one- and two-dimensional NMR techniques were used to elucidate the solution structures of these complex mixtures. The system, lithium tert-butoxide/tert-butyllithium, was studied as a model system with O/Li ratios varying from 0/1 to 1/1. It was found that at low O/Li ratios, a single mixed tetrameric aggregate was formed. At higher O/Li ratios, mixed hexameric species were formed. Two other systems, lithium isopropoxide/iso-propyllithium and lithium n-propoxide/n-propyllithium were also st… more
Date: December 1992
Creator: DeLong, George T. (George Thomas)
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Solvent and Ionic Complexes of the Calix[6]arenes

Description: One of the more attractive attributes of calixarenes is their wide variety of possible conformations and hence cavity shapes. However, the flexibility that allows this long-range benefit gives rise to major synthetic challenges when working with the larger members of the family. O-alkylations have proven to be the most widely employed synthetic routes to "functionalization" of the calixarenes, and these have shown a dependence upon both solvent and the metal ions present. Surprisingly, there ha… more
Date: December 1997
Creator: Wolfgong, William J.
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Some Physical Characteristics and Heavy Metal Analyses of Cotton Gin Waste for Potential use as an Alternative Fuel

Description: This study examines the waste of cotton gins as a potential alternative energy source, on account of its heat content, availability, and low emission rates. To confirm that this potential energy source meets minimum industrial fuel standards, this research has carried out an investigation of some important physical characteristics and toxic element analysis of cotton gin waste. Using cotton gin waste as fuel is an attractive solution to the problems of disposing of a surplus agricultural waste… more
Date: August 1996
Creator: Kim, Sungsoo
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Someone to Talk to: Conversations Between Friends in a Junior High Lunch Room

Description: Quantitative studies dominate early adolescence research, a field which also lacks an understanding of communication behaviors between early adolescents. This study uses the qualitative methods of participant observation and informal interviews to observe conversations between girls in a junior high lunch room. Friendship characteristics and group socialization are discussed as they emerged from the field data. First, friendship hierarchies (best friend, close friend, and friend) may be adult-i… more
Date: December 1990
Creator: Adams, Brenda Inglis
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Song of Pi-Pa

Description: Sona of Pi-Pa is a composition set to a poem to be performed by soprano and mixed instrumental ensemble. The formal plan is through-composed and the organization of each individual piece is largely determined by the structure of the poetic text. The text, drawn from Song of Pi-Pa by Po Chu-i, depicts the story of how the poet became overwhelmed by the chance hearing of a virtuosic performance of a woman playing the pi-pa. The general characteristics of the work reflect the assimilation of certa… more
Date: August 1994
Creator: Tseng, Yu-Chung, 1960-
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The Songs of Giacomo Puccini: An Analytical Study of His Style and Self-borrowing

Description: The songs of Puccini provide another approach to understanding the composer's musical development. The objective of the study is twofold; first to provide a discussion of the musical style of Puccini's songs; and second, to show how Puccini utilized and integrated the preexistent material into the operas. The songs are grouped and characterized in three stylistic periods. In each period, Puccini was concerned with different issues in text setting. They anticipated or corresponded to the musical… more
Date: August 1997
Creator: Kim, Soo Hong
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The Songs of Sidney Homer, with Three Recitals of Selected Works by Verdi, Handel, Brahms, Poulenc, Ives, Loewe, Fauré, Floyd and Others

Description: Now all but forgotten, the songs of Sidney Homer (1864-1953) were at one time well-regarded and often performed. Married to the great American contralto Louise Homer, he was in a unique position to have his songs performed by the great artists of the time. Unlike the cloying "parlor songs" of many of his contemporaries, his works consistently demonstrate a respect for both the great poets as well as the European art-song tradition. One of the most cosmopolitan of the American composers of his d… more
Date: December 1996
Creator: Snider, Jeffrey
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Songs of the wind

Description: Songs of the Wind is a five-movement composition for reader, chamber choir, and chamber orchestra. The work is approximately twenty-five minutes in duration. The title describes the programmatic nature of the piece, which depicts an animistic ritual invoking the wind as a deity. The texts are drawn from translations of American Indian poetry as well as original poems by the American Indian scholar Hartley Alexander.
Date: May 1991
Creator: Chang, Debra Wei Kwen
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"Sorrow Whispers in the Winds" : the Republic of Texas's Commanche Indian Policy, 1836-1846

Description: The Comanche Indians presented a major challenge to the Republic of Texas throughout its nine-year history. The presence of the Comanches greatly slowed the westward advancement of the Texas frontier, just as it had hindered the advancing frontiers of the Spaniards and Mexicans who colonized Texas before the creation of the Republic. The Indian policy of the Republic of Texas was inconsistent. Changes in leadership brought drastic alterations in the policy pursued toward the Comanche nation. Th… more
Date: December 1994
Creator: Lipscomb, Carol A.
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The Soul of it: A Video Documentary on Texas Sculptor John Thomas Campbell

Description: This thesis includes a video and a production report . The video documents a Denton artist, John Thomas Campbell who was working on a project for the Texas State Fair during the filming period. This documentary follows Campbell through his production on sculptures, using a biographical style to explore his life and his art work. The accompanying paper reports on the production background, pre-production process, and includes discussion of the problems encountered from production through post pr… more
Date: December 1994
Creator: Chou, Wei-Tung
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South-East Asia College: History, Development, Problems, and Issues Related to Achieving University Status

Description: The purpose of this study is to describe the history, development, problems, and issues related to achieving university status of South-East Asia College from 1974 to 1993. This historical research used records and documents from South-East Asia College and the Association of Private Higher Education Institutions of Thailand as primary sources. Also interviews with the president, faculty and staff of South-East Asia College were used. Secondary Sources were reports and publications from the Min… more
Date: May 1994
Creator: Chaowichitra, Jiravadee
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Southern Genre Painting and Illustration from 1830 to 1890

Description: The purpose of this thesis is to give a concise view of stylistic, iconographical, and iconological trends in Southern genre paintings and illustrations between 1830 and 1890 by native Southern artists and artists who lived at least ten years in the South. Exploration of artworks was accomplished by compiling as many artworks as possible per decade, separating each decade by dominant trends in subject matter, and researching to determine political and/or social implications associated with and … more
Date: December 1997
Creator: Akard, Carrie Meitzner
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A Spatial Analysis of Right-wing Radical Parties: The Case of the Republikaner Party Programs Since 1983

Description: Right-wing parties in European states have improved electorally in recent years. The small German Republikaner party is representative of these successes. This study examines outcomes for the Republikaner that may be attributable to movements on a number of policy issues.
Date: August 1994
Creator: Cordes, Niels G. (Niels Guether)
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Spatiotemporal Properties of Coupled Nonlinear Oscillators

Description: Spatiotemporal properties of classical coupled nonlinear oscillators are investigated in this thesis. Chapter 1 gives an introduction to nonlinear lattices and to the concept of breathers, that are spatially localized and temporally periodic excitation in nonlinear lattices. The concept of anti-continuous limit that provides the basic methodology in probing spatiotemporal breather properties is discussed. In Chapter 2, the general approach for finding exact breather solutions from the anti-cont… more
Date: July 1996
Creator: Chen, Ding
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A Spectral Analysis of Selected Vowels Sung by Bass and Baritone Student Singers

Description: While a limited body of research pertaining to vocal sound quality exists, technological advances in sound analyses have facilitated a reexamination of vocal timbre. The sound quality of sung vowels ([ a], [e ], C i ]) produced by ten baritone/bass singers at the University of North Texas was analyzed by the use of Fourier analysis and electronic digital equipment. This procedure and equipment produced results over a wider frequency range with greater accuracy than prior studies on vocal timbr… more
Date: August 1990
Creator: Tolin, Craig Edmond
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Spectrofluorometric and Solubility Studies of Polycyclic Aromatic Hydrocarbons in Hydrogen Bonded Binary Solvent Mixtures

Description: The purpose of this dissertation is to investigate the behavior of polycyclic aromatic hydrocarbons (PAHs) in binary solvent systems and determine and/or develop predictive mathematical expressions for describing solutions in which hydrogen-bonding occurs.
Date: May 1997
Creator: Powell, Joyce R., 1968-
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Spectrofluorometric Probe Methods for Examining Preferential Solvation in Binary Mixtures

Description: Spectrofluorometric probe methods are developed and examined regarding their ability to model preferential solvation around probe molecules in binary solvents. The first method assumes that each fluorophore is solvated by only one type of solvent molecule and that each fluorophore contributes to the emission intensity. Expressions for this model are illustrated using fluorescence behavior of pyrene, benzo[e]pyrene, benzo[ghi]perylene, and coronene dissolved in binary n-heptane + 1,4-dioxane and… more
Date: August 1994
Creator: Wilkins, Denise C.
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Spectroscopic Properties of Polycyclic Aromatic Compounds

Description: The fluorescence spectrum of many polycyclic aromatic compounds (PACs) depends upon solvent polarity. The emission spectrum of PAC monomers consists of several major vibronic bands labeled I, II, etc., in progressive order. Emission intensity enhancement of select bands is observed in polar solvents.
Date: May 1994
Creator: Tucker, Sheryl A. (Sheryl Ann)
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Stability of Secondary String Teachers' Rehearsal Behavior

Description: The purpose was to establish the stability of behavior of secondary string teachers. The research problems were (a) to establish the frequency of selected observable elements of content and instructional strategies; (b) to estimate the stability of observed teaching behaviors within and across rehearsals; and (c) to determine the stability of pacing within and across rehearsals. In conclusion, for the population observed, stability of behavior existed. The variable of multiple conduction, not g… more
Date: August 1992
Creator: Erwin, Joanne (Joanne Hall)
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Standardization of the Assessment of Competency to Stand Trial

Description: Evaluations of the Georgia Court Competency Test - Mississippi Version Revised (GCCT-MSH) and the Competency Screening Test (CST) have supported their use with pretrial defendants. The present study evaluated the efficacy of the measures with an inpatient population. Both measures were factor analyzed in an attempt to replicate; previously identified factor structures. Neither factor structure was replicated however, a distinct factor structure was identified for the GCCT-MSH. In addition, the … more
Date: August 1994
Creator: Ustad, Karen L. (Karen Lee)
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Standing in the Gap: Subposts, Minor Posts, and Picket Stations and the Pacification of the Texas Frontier, 1866-1886

Description: This dissertation describes the various military outposts on the Texas frontier between 1866 and 1886. It is arranged geographically, with each chapter covering a major fort or geographical area and the smaller posts associated with it. Official military records and government reports serve as the primary sources of data. In 1866 when the United States Army returned to the defense of Texas after four years of civil war, the state's frontier lay open to depredations from several Indian tribes an… more
Date: May 1995
Creator: Uglow, Loyd M. (Loyd Michael)
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