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open access

Remote Sensing of Landscape-Level Ecological Attributes at Ray Roberts Lake in North Texas

Description: Biological diversity is a key component in assessing ecosystem health. Alteration, degradation and loss of habitat due to human influence is currently the primary stressor resulting in decreases in diversity. Reliable assessment of large areas in terms of biological integrity are needed for conservation and preservation efforts. Remotely sensed data provide an integrated view of reflected electromagnetic energy over large areas of the earth. These energy patterns provide unique spectral signatu… more
Date: December 1997
Creator: Smith, David P. (David Paul), 1956-
Partner: UNT Libraries
open access

Structure, Energetics and Reactions of Bisketenes: An Ab Initio and Density Functional Theory Study

Description: The effect of varying substituents on structure and energies of bisketenes was studied using ab initio methods. Effect of substituents on ring closing reaction of bisketenes to the corresponding cyclobutenediones was also studied using ab initio methods. One or two of the following substituents were used to study the effect of varying substituents: BH2, CH3, NH2, OH, F, AlH2, SiH3, PH2, SH, Cl. Studies were done at the Hartree-Fock (HF), Møller-Plesset (MP2), and Density Functional Theory (B3LY… more
Date: December 1997
Creator: Palmer, Prem
Partner: UNT Libraries
open access

Into the Woods: Wilderness Imagery as Representation of Spiritual and Emotional Transition in Medieval Literature

Description: Wilderness landscape, a setting common in Romantic literature and painting, is generally overlooked in the art of the Middle Ages. While the medieval garden and the city are well mapped, the medieval wilderness remains relatively trackless. Yet the use of setting to represent interior experience may be traced back to the Neo-Platonic use of space and movement to define spiritual development. Separating themselves as far as possible from the material world, such writers as Origen and Plotinus av… more
Date: August 1997
Creator: Sholty, Janet Poindexter
Partner: UNT Libraries
open access

A Delphi Study to Determine if SCANS Workplace Know-How Can Be Developed through the Achievement of National Standards for [Visual] Arts Education

Description: The purpose of this study was to provide a basis for understanding among Tech Prep and School-to-Work change agents, and educational leaders, of the role that Discipline-Based Art Education (DBAE) can perform as a part of the core curriculum, within the framework of these reform movements. The literature indicated that the federally supported Tech Prep and School-to-Work reform movements were not acquainted with DBAE reform initiative which were supported by the Getty Education Institute for th… more
Date: August 1997
Creator: Crews, Jan, 1959-
Partner: UNT Libraries
open access

Evaluation of Text-Based and Image-Based Representations for Moving Image Documents

Description: Document representation is a fundamental concept in information retrieval (IR), and has been relied upon in textual IR systems since the advent of library catalogs. The reliance upon text-based representations of stored information has been perpetuated in conventional systems for the retrieval of moving images as well. Although newer systems have added image-based representations of moving image documents as aids to retrieval, there has been little research examining how humans interpret these … more
Date: August 1997
Creator: Goodrum, Abby A. (Abby Ann)
Partner: UNT Libraries
open access

The Distribution of Environmental Contaminants: a Socio-Historical Study of Selected Neighborhoods in Dallas County, Texas

Description: This research expands on recent sociological studies which maintain that environmental contaminants in America are disproportionately placed in neighborhoods inhabited by minorities and the poor. Prior studies have focused on the predictor variables which identify areas of contamination near residential neighborhoods, yet fail to explore the socio-political and historical factors which contribute to these phenomena. The Environmental Protection Agency's Toxic Release Inventory 1990 database, th… more
Date: December 1997
Creator: Cutrer, Jennifer G.
Partner: UNT Libraries
open access

Assessment of Changes in Aquatic Macrophyte Occurrence Following Introduction of Triploid Grass Carp in a North Texas Reservoir

Description: The objectives of this project were to measure changes in frequency of occurrence of submerged macrophytes over the first two growing seasons following stocking with triploid grass carp at two fish per acre and to measure differences in macrophyte biomass between areas excluded from herbivory and adjacent control sites after 16 months following establishment of exclosures. The project also seeks to measure concentrations of fluridone following the herbicide treatment, and to compare two methods… more
Date: August 1997
Creator: Bickel, Ken (Kenneth E.)
Partner: UNT Libraries
open access

Motivational Style, Length of Residency, and Voluntariness in Relation to Nursing Home Adjustment

Description: This study related length of residency, motivational style, and the resident's role in deciding to move to a nursing facility to adjustment, represented by a number of variables (e.g., desired control, expected control, life satisfaction, and affect). Fifty-five residents of nursing facilities and assisted-living apartments were given an interview, compiled of a number of brief measures relating to aspects of adjustment. While results from multivariate analyses of variance failed to support any… more
Date: May 1997
Creator: Curtiss, Karin
Partner: UNT Libraries
open access

Substitution Chemistry of Ruthenium Clusters with the Diphosphine Ligands: 4,5-Bis(Diphenylphosphino)-4-Cyclo-Penten-1,3-Dione (bpcd), (Z)-Ph₂PCH=CHPP₂ and 3,4-Bis(Diphenylphosphino)-5-Methoxy-2(5H)-Furanone (bmf)

Description: The chemistry of transition metal clusters has been a fast developing area of organometallic research in recent years. Compared to mononuclear metal complexes, polynuclear clusters offer more opportunities to study cooperative effects and electron reservoir properties between contiguous metal centers, in addition to functioning as storehouses for the release of catalytically active small fragments capable of exhibiting heterosite subtrate activation. Theoretically, metal clusters are intermedia… more
Date: May 1997
Creator: Shen, Huafeng
Partner: UNT Libraries
open access

Using Ordering Theory to Establish Student Knowledge Levels

Description: The problem under investigation in this research is the development of a general approach that will establish a students knowledge level so that the student's learning can be optimized by beginning it at the most effective point. In preparation for this study, an active test with an acceptable CT3 homogeneity index was found. Two computer programs, RightOrder and MathTest, were written in Visual Basic. The latter administers the test, producing a file or responses that serves as input for the f… more
Date: August 1997
Creator: Byers, Celina
Partner: UNT Libraries
open access

A Study of the Relationships Among Social Interest, Marital Satisfaction, and Religious Participation

Description: The purpose of this study is to investigate the possible relationship between social interest and marital adjustment in a selected group of married couples. Another variable relating to spiritual well-being and religious participation is also considered. In the studies reviewed, the concept of social interest as proposed by Adler has been supported as a psychological construct. It has generally correlated with characteristics that are viewed as social interest components. By contrast, it has ge… more
Date: August 1997
Creator: Thornton, John Michael, 1950-
Partner: UNT Libraries
open access

Critical Factors in Successful Texas Middle Schools 1993-1995

Description: An examination of the characteristics of Texas middle schools has been conducted with the objective of developing a planning tool for middle staffs. This success is measured by the Academic Excellence Indicator System (AEIS), whose rating scale has three components: campus scores on the Texas Assessment of Basic Skills (TAAS), campus attendance percentages, and campus dropout rates. TAAS scores and attendance rates have been the focus of this study. Two years of data were examined separately fo… more
Date: August 1997
Creator: Antoine, Terry W.
Partner: UNT Libraries
open access

The Relationship Between Piagetian Developmental Levels and the Persuasive Writing Ability of Third, Fourth, and Fifth Graders

Description: Research questions addressed whether (1) the instruction was effective, (2) performance on persuasive tasks differed by grade level following instruction, (3) performance on persuasive tasks differed by Piagetian developmental level following instruction, and (4) whether performance differed between monolingual and bilingual subjects. Students wrote four persuasive compositions for assessment, two before instruction was administered and two after instruction. Knudson's holistic scoring rubric w… more
Date: December 1997
Creator: Poulsen, Belinda Gae
Partner: UNT Libraries
open access

Representing the Observable Textural Patterns of Moving Water in Stone

Description: I plan to create a representation of the textures of four distinct states of moving water in three stone sculptures. These structured textural elements are intended to provide compelling visual stimuli that will enhance the viewers' understanding of the sculptures. The dynamic quality of rhythm inherent in the four observable patterns will be conceptually and physically captured on a stone surface.
Date: August 1997
Creator: Joplin, Jason
Partner: UNT Libraries
open access

Injuring Eternity

Description: I endeavored to investigate how temporal forms could be used as an avenue for addressing my sculptural concerns. These concerns included the relationship of form to material, the temporary manifestation of enduring principles, and responsibility to materials and their meanings. My pursuit of this investigation arose from both a search for alternatives in a field with a tradition of permanent object orientation and an effort to expand my own perceptions of what constitutes sculpture and the acti… more
Date: December 1997
Creator: Neumann, Cristophe
Partner: UNT Libraries
open access

Plast-I-Kits: Thesis Pieces

Description: I proposed to base my thesis work upon an exploration of the ideas of the strength, power, and tenuous quality of metals, using a variety of metals in combination with appropriated and deconstructed forms to create cultural narratives. In this exploration, I addressed the materials of metalsmithing and their traditional use.
Date: August 1997
Creator: Laswell, Susan
Partner: UNT Libraries
open access

Messages from an Imagination

Description: The large scale format allows the images I created to have a more pronounced impact on the viewer. Self-reflective subject matter exhibited within the large attention-getting style allows an audience to better connect and identify with the figures in my work. The piece is a series of large scale paintings butted together both side by side at one hundred thirty-five-degree angles that provides a vehicle to surround the viewer. The paintings, when placed together, form a continuous image and pres… more
Date: May 1997
Creator: White, Derrick R.
Partner: UNT Libraries
open access

The Comic Book Style as Stylistic Meaning in Painting

Description: I Investigated the use of unpremeditated and reactionary methods of composing to arrange the landscape and figurative elements in my paintings. Though it may not necessarily be the case, these paintings may appear to have a narrative structure. The media, graphic imagery, and figure/ground relationships have given me a feedback loop, a guide by which I pictorially arranged the remainder of the developing composition. The painting revealed its identity and direction in this way to me. The applic… more
Date: August 1997
Creator: Scroger, Chris
Partner: UNT Libraries
open access

Time-specific measurements of energy deposition from radiation fields in simulated sub-micron tissue volumes

Description: A tissue-equivalent spherical proportional counter is used with a modified amplifier system to measure specific energy deposited from a uniform radiation field for short periods of time ({approximately}1 {micro}s to seconds) in order to extrapolate to dose in sub-micron tissue volumes. The energy deposited during these time intervals is compared to biological repair processes occurring within the same intervals after the initial energy deposition. The signal is integrated over a variable collec… more
Date: July 7, 1997
Creator: Famiano, M.A.
Partner: UNT Libraries Government Documents Department
open access

Symbolic derivation of high-order Rayleigh-Schroedinger perturbation energies using computer algebra: Application to vibrational-rotational analysis of diatomic molecules

Description: Rayleigh-Schroedinger perturbation theory is an effective and popular tool for describing low-lying vibrational and rotational states of molecules. This method, in conjunction with ab initio techniques for computation of electronic potential energy surfaces, can be used to calculate first-principles molecular vibrational-rotational energies to successive orders of approximation. Because of mathematical complexities, however, such perturbation calculations are rarely extended beyond the second o… more
Date: July 1, 1997
Creator: Herbert, J. M.
Partner: UNT Libraries Government Documents Department
open access

A search for flavor changing neutral currents and lepton family number violation in neutral two-body charm decays

Description: This work presents a search for three rare/forbidden neutral charm decays, D{sup 0} {yields} {mu}e, D{sup 0} {yields} {mu}{mu}, and D{sup 0} {yields} ee. This study was based on data collected in Experiment E789 at the Fermi National Accelerator Laboratory using 800 GeV/c proton-gold interactions. Two statistical analyses are presented, one with background subtraction and the other without background subtraction. No evidence is found for any of the decays and the following upper limits are pres… more
Date: June 1, 1997
Creator: Pripstein, D.A.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the top quark mass

Description: This dissertation describes the measurement of the top quark mass m{sub t} using events recorded during a 125 pb{sup -1} exposure of the D0 detector to {radical}s=1.8 TeV {anti p}p collisions. Six events consistent with the hypothesis t{anti t} {yields} bW{sup +}, {anti b}W{sup -} {yields} b{anti l}{nu}, {anti b}l{anti {nu}} form the dilepton sample. The kinematics of such events may be reconstructed for any assumed mt, and the likelihood of each such solution evaluated. A measurement of m{sub … more
Date: December 31, 1997
Creator: Varnes, E.W.
Partner: UNT Libraries Government Documents Department
open access

Studies of structures and phase transitions in pyrrhotite

Description: This report contains a general introduction, the experimental section, general conclusions, and two appendices: using projection operators to construct the basis functions and the magnetic transition of bulk pyrrhotite samples in the low-temperature range. Four chapters have been removed for separate processing. They are: From pyrrhotite to troilite: An application of the Landau theory of phase transitions; Phase transition in near stoichiometric iron sulfide; A ordering, incommensuration and p… more
Date: March 31, 1997
Creator: Li, F.
Partner: UNT Libraries Government Documents Department
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