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259 Matching Results
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Forest Landscape Dynamics: a Semi-Markov Modeling Approach
A transition model (MOSAIC) is used to describe forest dynamics at the landscape scale. The model uses a semi-Markov framework by considering transition probabilities and Erlang distributed holding times in each transition. Parameters for the transition model are derived from a gap model (ZELIG). This procedure ensures conceptual consistency of the landscape model with the fine scale ecological detail represented by the forest gap model. Spatial heterogeneity in the transition model is driven by maps of terrain with characteristics contained in a Geographic Information System (GIS) database. The results of the transition model simulations, percent cover forest type maps, are exported to grid-maps in the GIS. These cover type maps can be classified and used to describe forest dynamics using landscape statistics metrics. The linkage model-GIS enhances the transition model spatial analytical capabilities. A parameterization algorithm was developed that takes as input gap model tracer files which contain the percent occupation of each cover type through time. As output, the algorithm produces a file that contains the parameter values needed for MOSAIC for each one of the possible transitions. Parameters for the holding time distribution were found by calculating an empirical estimate of the cumulative probability function and using a …
Date:
August 1997
Creator:
Ablan, Magdiel
System:
The UNT Digital Library
Southern Genre Painting and Illustration from 1830 to 1890
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 affecting each image. Historical documents and the findings of other scholars revealed that many artworks carried political overtones reflecting the dominant thought of the white ruling class during the period while the significance and interpretation of other artworks was achieved by studying dominant personal beliefs and social practices.
Date:
December 1997
Creator:
Akard, Carrie Meitzner
System:
The UNT Digital Library
Muscular Differences Between Female Power and Endurance Athletes
The purpose of this study was to compare the torque generating capabilities and fatigue responses of female power athletes, female endurance athletes, and age-matched female non-athletic controls.
Date:
August 1997
Creator:
Akers, Allen (Roy Allen)
System:
The UNT Digital Library
A Structural Equation Analysis of Intergenerational Differences in Attitudes toward Individual Modernity in the United Arab Emirates: Implications for Cross-Cultural Research
It has been widely believed that modernity is a byproduct of a nuclear family system, a highly urbanized society, and a secular way of life. As such, developing countries are characterized as modern insofar as their social and cultural structures are able to correspond to these criteria. To examine the validity of these propositions, data on two randomly-selected generations--daughters and mothers in the United Arab Emirates--were generated.
Date:
May 1997
Creator:
Al-Ghazy, Faris M.
System:
The UNT Digital Library
Mail Order Music: the Hinners Organ Company in the Dakotas, 1879-1936
Founded in 1879 by John L. Hinners, the Hinners Organ Company developed a number of stock models of small mechanical-action instruments that were advertised throughout the Midwest. Operating without outside salesmen, the company was one of the first to conduct all of its affairs by mail, including the financial arrangements, selection of the basic design, and custom alterations where required. Buyers first met a company representative when he arrived by train to set up the crated instrument that had been shipped ahead of him. Tracker organs with hand-operated bellows were easily repaired by local craftsmen, and were suited to an area that, for the most part, lacked electricity. In all, the company constructed nearly three thousand pipe organs during its sixty years of operation. Rapid decline of the firm began in the decade prior to 1936 during which the company sold fewer than one hundred instruments, and closed in that year when John's son Arthur found himself without sufficient financial resources to weather the lengthy depression. The studies of the original-condition Hinners organs in the Dakotas include extensive photographs and measurements, and provide an excellent cross section of the smaller instruments produced by the company. They are loud, excellently crafted, …
Date:
August 1997
Creator:
Alcorn-Oppedahl, Allison A. (Allison Ann)
System:
The UNT Digital Library
Systematics of the Stonefly Tribe Suwalliini Surdick and Behavioral Studies of Selected Species in the Stonefly Families Chloroperlidae and Perlidae
The purpose of this study is to revise the genus Suwallia and to evaluate the potential taxonomic importance of adeagal and other genitalic characters, adult pigment patterns and egg characters. The revision concentrates on western North American species while providing coverage of all species, except Suwallia asiatica Zhiltzova and Lavanidova where only presumed females have been available for study. Communication and mate locating behaviors in adult stoneflies are critical for life cycle completion and species perpetuation. Drumming signals are known for numerous species of Plecoptera, but mate searching patterns and specifically, if or how vibrational communication is utilized for locating mates are virtually unknown for all stonefly species. I conducted field or laboratory studies of three species to elucidate mate searching patterns and how vibrational communication is used for locating mates. The species studied included a bushtopper, Suwallia pallidula (Banks); a ground scrambler, Claassenia sabulosa (Banks); and treetopper, Perlinella drymo (Newman). The "fly-tremulate-search". "rock to rock" and "fly-drum-search" search patterns exhibited by these species are described, as well as how vibrational communication is used for mate finding. Vibrational signal production by tremulation is reported for the first time in Suwallia, and for only the second time Plecoptera.
Date:
August 1997
Creator:
Alexander, Kevin D. (Kevin Dewayne)
System:
The UNT Digital Library
Critical Factors in Successful Texas Middle Schools 1993-1995
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 for research question. Principal component analysis reduced the number of indicators in both years' data to 20 factors/ Each of these factors received a designated based on the characteristics that the component indicators had in common. A multiple regression analysis was performed on these factors to determine the influence each had on the campus TAAS scores and attendance. The unpredictability of human subjects requires an additional step in this study to achieve valid conclusions. A comparison of the two years' results is made to discover attendance, gifted and talented programs, and teacher gender were the strongest overall positive influences on student achievement. Campus demographics, retention, and ESL/bilingual programs have the strongest association with low student achievement.
Date:
August 1997
Creator:
Antoine, Terry W.
System:
The UNT Digital Library
Factors Influencing Freshmen Students' College Choice at the University of North Texas: a Focus Group Study
This study focused on factors that may influence freshmen students when choosing their colleges, specifically those who attend metropolitan universities such as the University of North Texas. In addition to identifying major characteristics of the institution that attract students, it also explored the sources of information that students considered important when making their choice about where to attend college. The primary instrument for gathering the data was focus groups. These informal, small groups provided a format for in-depth discussion and probing questioning about the needs, wants and influential factors driving freshmen college choice. Ten focus groups were held with between six and ten students in a specially designed room on the campus of the University of North Texas. A professional moderator was employed and sessions were observed via a two-way mirror and tape recorded for later transcription. The major questions addressed in the focus groups included: What factors influenced students the most to attend the University of North Texas? What did they consider the level of friendliness on campus? And how did the marketing materials that the university distributed impact their decision to attend? The study found that the factors that most influenced freshmen to attend the University of North …
Date:
August 1997
Creator:
Armstrong, Jami J. (Jami Joi)
System:
The UNT Digital Library
The Marriage of the Graceful and the Flagrant: A Sculptural Inquiry of the Modern Woman
This paper discusses the author's selected works, four sculptural pieces cast in bronze and painted with oil paint washes. Cari D. Ashworth explains how the works illustrate challenges faced by the modern woman in today's society, and how the dramatic flair of the pieces produces imagery.
Date:
May 1997
Creator:
Ashworth, Cari D.
System:
The UNT Digital Library
Compulsive Sexual Behavior and Personality Characteristics : A Comparative Analysis
The purpose of the present study was to compare the scores of the Beck Depression Inventory, State-Trait Anxiety Inventory, and the Coopersmith Inventory of heterosexual men with compulsive sexual behavior (N = 22), homosexual men with compulsive sexual behavior (N = 19), heterosexual men without compulsive sexual behavior (N = 38), and homosexual men without compulsive sexual behavior (N = 8). The Sex Addiction Screening Test was used to determined placement in a group. Findings revealed men who exhibit compulsive sexual behavior are significantly more depressed, experience lower self-esteem and have higher state anxiety (situational) than controls.
Date:
December 1997
Creator:
Austin, Christopher Joe
System:
The UNT Digital Library
Computer-Supported Collaborative Work and Its Application to Software Engineering in a Case Environment
This study investigated, in the context of a field-based case study, possibilities for formation of a synergistic union between CSCW and CASE tools. A major dimension of today's software challenge is in gearing up for large-scale system development necessitating large teams of systems engineers. The principal goal of this research was to advance the body of knowledge regarding the nature of collaborative technological support in the software development process. Specifically, the study was designed to evaluate the potential for using a CSCW tool as an effective front-end to a CASE tool in the furtherance of SDLC goals.
Date:
May 1997
Creator:
Bailey, Janet L.
System:
The UNT Digital Library
Performance of Children With and Without Traumatic Brain Injury on the Process Scoring System for the Intermediate Category Test
The clinical utility of the Intermediate Category Test, a measure of executive functioning in children 9 to 14 years of age, is currently limited by the availability of only a Total Error score for normative interpretation. The Process Scoring System (PSS) was developed to provide a standardized method of assessing specific processing patterns and problem-solving errors. The purpose of this study was to determine the ability of the PSS scores to discriminate between children with and without suspected executive deficits, thereby providing evidence of criterion-related validity.
Date:
May 1997
Creator:
Bass, Catherine
System:
The UNT Digital Library
Self-Efficacy and Selected Variables as Predictors of Persistence for First Quarter Students at a Proprietary Institution
Proprietary colleges are uniquely different from two or four year colleges due to the emphasis on the student establishing a definite career path prior to enrollment. Because of this career track emphasis, Bandura's (1977) postulation that self-efficacy is a significant variable influencing task completion may offer insight into the challenge of student retention at a proprietary college. The study's purpose was to determine if career self-efficacy, demographic factors, and academic preparedness measures in first quarter students could predict student persistence, class attendance, and academic performance. The statistical technique of multinomial logistic regression was applied to data files of 725 first quarter students who attended The Art Institute of Dallas from Summer 1996 through Winter 1997. The predictor variables included a measure of career self-efficacy, ASSET scores (American College Testing Program, 1994), ethnicity, age, gender, full-time/part-time attendance, high school grade point average, parents' educational level, socioeconomic status, and developmental course placement. Criterion variables were completion, class attendance, and cumulative grade point average.
Date:
August 1997
Creator:
Baughman, Leslie C. (Leslie Claire)
System:
The UNT Digital Library
Political Culture in West and East Germany at the TIme of Reunification: Revisiting the Civic Culture
Studies of political culture have often focused on the impact of political institutions on political culture in a society. The scientific community has accepted the position that institutions shape beliefs and attitudes among the citizens towards the system they live in. This study tests this hypothesis by using survey data collected during the fall of 1990 in the United States, Great Britain, Italy, West, and East Germany.
Date:
August 1997
Creator:
Baumann, Steffen
System:
The UNT Digital Library
Filial Therapy with Children with Spectrum Pervasive Developmental Disorders
This investigation was concerned with determining the effectiveness of filial therapy as a method of intervention for families of children with pervasive developmental disorders.
Date:
December 1997
Creator:
Beckloff, Dean R. (Dean Ray)
System:
The UNT Digital Library
East, West, Somewhere in the Middle
A work of creative fiction in novella form, this dissertation follows the first-person travails of Mitch Zeller, a 26-year-old gay man who is faced with an unexpected choice. The dissertation opens with a preface which examines the form of the novella and the content of this particular work.
Date:
December 1997
Creator:
Behlen, Shawn Lee
System:
The UNT Digital Library
A Comparison of Academic Stress Experienced by Students at an Urban Community College and an Urban University
The present study compared the academic stress levels of 450 college sophomore students at a public university and a public two-year college. This investigation also explored the levels of academic stress by institutional type, age, gender, and ethnicity. Data were obtained from having the subjects complete the Academic Stress Scale, a questionnaire which lists thirty five stress items found in the college classroom. Analysis of variance and t-tests were used to analyze the data. There were 225 subjects each in the community college group and the university group. The university group had a statistically significant higher mean stress score than the community college group. 294 traditional age (23 and younger) and 156 nontraditional age (24 and over) subjects stress levels were compared. It was found that the traditional age college student group experienced a statistically significant higher academic stress level in both academic settings. Group means were compared between the stress scores of 245 female and 205 male subjects. At both the community college and university levels, the female group had a statistically significant higher level of academic stress. The academic stress levels were also compared according to ethnicity. The minority group consisted of 104 subjects and 346 subjects comprised …
Date:
May 1997
Creator:
Benson, Larry G. (Larry Glen)
System:
The UNT Digital Library
The Fractal Stochastic Point Process Model of Molecular Evolution and the Multiplicative Evolution Statistical Hypothesis
A fractal stochastic point process (FSPP) is used to model molecular evolution in agreement with the relationship between the variance and mean numbers of synonymous and nonsynonymous substitutions in mammals. Like other episodic models such as the doubly stochastic Poisson process, this model accounts for the large variances observed in amino acid substitution rates, but unlike other models, it also accounts for the results of Ohta's (1995) analysis of synonymous and nonsynonymous substitutions in mammalian genes. That analysis yields a power-law increase in the index of dispersion and an inverse power-law decrease in the coefficient of variation with the mean number of substitutions, as predicted by the FSPP model but not by the doubly stochastic Poisson model. This result is compatible with the selection theory of evolution and the nearly-neutral theory of evolution.
Date:
May 1997
Creator:
Bickel, David R. (David Robert)
System:
The UNT Digital Library
Assessment of Changes in Aquatic Macrophyte Occurrence Following Introduction of Triploid Grass Carp in a North Texas Reservoir
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 of aquatic vegetation sampling.
Date:
August 1997
Creator:
Bickel, Ken (Kenneth E.)
System:
The UNT Digital Library
Strategy, Structure, and Performance of U.S.-Based Multinational Organizations: A Fit Theory Study
The research question addressed by the study asks, "Is international integration strategic and departmental structural fit a predictor of performance in U.S.-based, single-business multinational organizations?" The study is designed to extend existing research in international integration strategy, which is often called "global strategy," "globalization," or "internationalization" in the popular press and academic research literature.
Date:
August 1997
Creator:
Blackwell, Rodney D. (Rodney Dean)
System:
The UNT Digital Library
An Investigation of the Influence of Evaluator Background on Appraisals of a Music Lesson Using the Texas Teacher Appraisal System
This study's purpose was to investigate the differences in scores and written comments given by two appraisal groups in their evaluation of a music teacher using the Texas Teacher Appraisal System (TTAS). One appraiser group had musical training while the other group specialized in other subjects. Analyses of both group's appraisal scores showed no significant differences. An examination of the written comments revealed that both appraisal groups focused on the same aspects of the lesson and used similar vocabulary. The TTAS instrument was a consistent measure of generic teacher behaviors in the music lesson, but it did not measure specific music teaching behaviors or encourage suggestions for improving musical instruction.
Date:
December 1997
Creator:
Bohnstengel, Carol
System:
The UNT Digital Library
Effects of Performance Levels of Subject Matter Experts on Job Analysis Outcomes
Much research has been undertaken to determine how Subject Matter Expert characteristics affect job analysis outcomes. The current study seeks to discover if performance levels are related to current incumbents ratings of their positions. A group of 114 corporate associates, from two administrative positions, served as Subject Matter Experts (SME) for this study. Separate job analyses for each position were conducted using the Job Analysis Task Checklist. The results for each job were analyzed to determine if SME performance levels affected job analysis outcomes. The results for both jobs showed that there were very few differences in job analysis results as a function of SME performance levels.
Date:
December 1997
Creator:
Boyd, Charlotte Friedersdorff
System:
The UNT Digital Library
Development of a Database Guide for Institutional Research in a Theological Seminary
This study sought to create a guideline to assist theological seminaries build a longitudinal database for institutional research. The study used the National Center for Higher Education Management (NCHEMS) data element dictionary as the base document for the study.
Date:
June 1997
Creator:
Bratton, Terry L. (Terry Lee)
System:
The UNT Digital Library
External and Internal Influences on Congruence Between Sexual Attitudes and Behavior
The purpose of this study was to examine the hypotheses that the external factors of family environment, gender, and clinical status and the internal factors of self-esteem and impression management would have either a positive influence or a negative influence on individuals' congruence between their sexual attitudes and their sexual behavior. The hypotheses that the external and internal factors would be significant predictors of congruence between sexual attitudes and behavior were not supported by regression analyses. Clinical status and impression management were significant predictors of congruence but in the opposite direction than hypothesized. When age was factored out of the regression equation, clinical status was no longer a significant predictor of congruence. However, impression management remained a significant predictor of congruence.
Date:
December 1997
Creator:
Brewer, Laura C. (Laura Catherine)
System:
The UNT Digital Library