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11,362 Matching Results
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Riparian Forest Width and the Avian Community in a Greenbelt Corridor Setting
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The forest avian community of the Ray Roberts Greenbelt (Denton Co., Texas) was characterized for two years using point count station sampling, from fall 1998 to summer 2000. Richness data for both breeding seasons were correlated with two-spatial metrics: width of the riparian forest and distance to the nearest edge. There were significant correlations between forest interior species richness and both spatial metrics, for both breeding seasons. Based on these data, a minimum riparian forest width threshold of 400-meters is suggested to provide habitat for forest interior species, which have lost considerable habitat through forest fragmentation. Partners in Flight breeding bird priority concern scores were used to create a habitat priority index for the Trinity River bottomland hardwood forest system
Date:
May 2001
Creator:
Hoffman, Karl W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Correspondence Between Aquatic Ecoregions and the Distribution of Fish Communities of Eastern Oklahoma
I assessed fish community data collected by the Oklahoma Conservation Commission from 82 minimally impaired wadeable reference streams in eastern Oklahoma to determine whether existing aquatic ecoregions provide the best framework for spatial classification for the development of biological assessment methods and biocriteria. I used indirect ordination and classification to identify groups of sites that support similar fish communities. Although correspondence was observed between fish assemblages and three montane ecoregions, the classification system must be refined and expanded to include major drainage basins and physical habitat attributes for some areas to adequately partition variance in key measures of biological integrity. Results from canonical correspondence analysis indicated that substrate size and habitat type were the primary physical habitat variables that influenced the fish species composition and community structure.
Date:
May 2001
Creator:
Howell, Charles E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Reactions of psychotherapists in training to religious questions
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This project investigated the spiritual well-being (SWB) of psychotherapists in training and their physiological reactions to religious questions posed by a mock client. Electrodermal activity served as an index of physiological arousal interpreted as anxiety. Thirteen psychotherapists in training at the University of North Texas were recruited. They participated in a simulated intake session with a mock client who asked the psychotherapist neutral questions, personal-other questions (POQs), and personal-religious questions (PRQs). It was discovered that the level of SWB did not affect subjects' anxiety responses to PRQs. There also was no difference in subjects' anxiety responses for POQs between high and low SWB therapists. However, psychotherapists did experience some anxiety associated with questions related to their counseling experience and expertise.
Date:
May 2001
Creator:
Hutchinson, Geoffrey
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Layered Double Hydroxides and the Origins of Life on Earth
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A brief introduction to the current state of research in the Origins of Life field is given in Part I of this work. Part II covers original research performed by the author and co-workers. Layered Double Hydroxide (LDH) systems are anion-exchanging clays that have the general formula M(II)xM(III)(OH)(2x+2)Y, where M(II) and M(III) are any divalent and trivalent metals, respectively. Y can be nearly any anion, although modern naturally occuring LDH systems incorporate carbonate (CO32-), chloride (Cl-), or sulfate (SO42-) anions. Intercalated cobalticyanide anion shows a small yet observable deviation from local Oh symmetry causing small differences between its oriented and non-oriented infrared spectra. Nitroprusside is shown to intercalate into 2:1 Mg:Al LDH with decomposition to form intercalated ferrocyanide and nitrosyl groups of an unidentified nature. The [Ru(CN)6]4- anion is shown to intercalate into layered double hydroxides in the same manner as other hexacyano anions, such as ferrocyanide and cobalticyanide, with its three-fold rotational axis perpendicular to the hydroxide sheets. The square-planar tetracyano-nickelate(II), -palladate(II), and platinate(II) anions were intercalated into both 2:1 and 3:1 Mg:Al layered double hydroxides (LDH). The basal spacings in the 2:1 hosts are approximately 11 Å, indicating that the anions are inclined approximately 75 degrees relative to …
Date:
May 2001
Creator:
Brister, Brian
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Improving Appointment Keeping at an Eye Care Clinic Using a Revised Process Package
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Use of this item is restricted to the UNT Community
Missed appointments by patients are a major problem for health care professionals. To combat this issue, some optometrists use a pre-appointing system in which patients are scheduled for an annual exam a year after their initial visit. Prior to that subsequent appointment, clinic staff often try to contact the patient to confirm the appointment. This study examined baseline levels of appointment keeping, analyzed existing processes for pre-appointing patients, and introduced a revised process package to improve appointment keeping at an eye care clinic. This package included training, mailed postcard reminders and two phone call reminders. Results indicate appointment keeping by pre-appointed patients increased over baseline. The intervention was also shown to be cost-beneficial.
Date:
May 2001
Creator:
Hodge, Victoria L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A preliminary study on the effect of selective serotonin reuptake inhibitors on peripheral and lower brainstem auditory processing.
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This study compared auditory behavioral and physiologic measures in normal control subjects and subjects prescribed with a selective serotonin reuptake inhibitor (SSRI) who were yet to take the drug and those currently taking an SSRI. Test measures used were pure tone averages (PTA), acoustic reflex thresholds, uncomfortable loudness levels (UCL), otoacoustic emissions, masking level difference, temporal integration, amplitude resolution, and Beck Depression Inventory-II (BDI-II) scores. Results indicated that there was a significant difference in the amplitude resolution of the unmedicated group when compared to the medicated and the control group. There was also a significant positive correlation between dynamic range (difference between UCL and PTA) and amplitude resolution. The BDI-II revealed a significant difference between the scores of the unmedicated and the control group as well as the medicated and the control group. Although other test measures indicated differences between the groups, the differences were not statistically significant.
Date:
May 2001
Creator:
Carney, Lara E.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A model for designing a new telecommunication system in Mongolia
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The objective of this research is to design, and determine the feasibility of, a telecommunication system for the city of Erdenet, Mongolia. The Mongolian Telecommunication Company, Telecommunication Company of Erdenet city, and the National Statistical Office of Mongolia provided the data required for telecommunication forecasting of Erdenet. The literature review and analysis of the telecommunication forecasting indicate the need for a model of a new Telecommunication system in Erdenet, Mongolia. The model, as indicated, should become a useful example for planning and updating the telecommunication system in Mongolia. The design of a proposed telecommunication network involves the following considerations: analyzing and forecasting telephone traffic, calculating the required number of channels, determining exchange locations, traffic matrix, and establishing a basic hierarchical structure.
Date:
May 2001
Creator:
Baatarjav, Enkhbat
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Influences of the Mother-Daughter Relationship on Motivations for Sexual Behavior
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Use of this item is restricted to the UNT Community
The influences of family relationship variables on motivations for adolescent sexual risk-taking were investigated. Previous research has linked these variables to adolescent sexual behavior, however, the nature of these links has not been specifically examined. Family variables were operationalized as child attachment to mother, parental support of each other, parental conflict strategies, and parental monitoring. Emotional motivations were operationalized as attachment and affiliation needs. The sample consisted of 40 single females ages 18 to22 recruited from a local pregnancy care center. Predictions that parent-child relationship and parental influence would predict emotional motivations for sexual risk-taking were not supported. The variable most highly related to sexual risk-taking, though not included in the model tested, was father's destructive conflict strategies. Theoretical and methodological issues are discussed.
Date:
May 2001
Creator:
Barrett, Susan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
University Students and the Internet: Information Seeking Study
This study explored university students' information needs and seeking behaviors on the Internet. A Web-based survey was administrated one time. Two hundred responses were received from the target sample within the two weeks period of the study. Data were analyzed with descriptive statistics, factor analysis, and graphical representation. The study explored various issues related to the usability, preferences, and activities of the Internet, such as searching tools, e-mail, search engines, and preferred primary sources of everyday-life information needs. The study explored the perceptions of the students toward the Internet and the traditional library. Kuhlthau's model of the information-seeking process, which includes six stages and affective components, was utilized and modified in the construction of the Web survey. A study by Presno (1998), which includes the four types of Internet anxiety, was utilized in the construction of the Web survey. With regard to the six stages of Kuhlthau model, the majority of the respondents experienced stage 5, which was about information gathering; stage 3 had the next highest number of respondents. Very few respondents experienced stages 1 and 2. There was a systematic pattern in which, the earlier the stages the respondents were in, the more negative adjectives they selected, and …
Date:
May 2001
Creator:
Shamo, Esmaeel
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Rio Grande Expedition, 1863-1865
In October 1863 the United States Army's Rio Grande Expedition left New Orleans, bound for the Texas coast. Reacting to the recent French occupation of Mexico, President Abraham Lincoln believed that the presence of U.S. troops in Texas would dissuade the French from intervening in the American Civil War. The first major objective of this campaign was Brownsville, Texas, a port city on the lower Rio Grande. Its capture would not only serve as a warning to the French in Mexico; it would also disrupt a lucrative Confederate cotton trade across the border. The expedition had a mixed record of achievement. It succeeded in disrupting the cotton trade, but not stopping it. Federal forces installed a military governor, Andrew J. Hamilton, in Brownsville, but his authority extended only to the occupied part of Texas, a strip of land along the coast of the Gulf of Mexico. The campaign also created considerable fear among Confederate soldiers and civilians that the ravages of civil war had now come to the Lone Star State. Although short-lived, the panic generated by the Rio Grande Expedition left an indelible mark on the memories of Texans who lived through the campaign. The expedition achieved its greatest …
Date:
May 2001
Creator:
Townsend, Stephen A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Development of a Procedure to Evaluate Groundwater Quality and Potential Sources of Contamination in the East Texas Basin
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This study contributes a procedure, based on data analysis and geostatistical methods, to evaluate the distribution of chemical ratios and differentiate natural and anthropogenic contaminant sources of groundwater quality in the East Texas Basin. Four aquifers were studied, Sparta, Queen City, Carrizo and Wilcox. In this study, Carrizo- Wilcox is considered as one aquifer, and Sparta-Queen City as another. These aquifers were divided into depth categories, 0-150 feet for Sparta-Queen City and 300-600 feet and 600-900 feet for Carrizo-Wilcox in order to identify individual sources of contamination. Natural sources include aquifer mineral make up, salt domes and lignite beds. Major anthropogenic sources include lignite and salt dome mining and oil-gas production. Chemical ratios selected were Na/Cl, Ca/Cl, Mg/Cl, SO4/Cl, (Na+Cl)/TDS, SO4/Ca and (Ca+Mg)/(Na+K). Ratio distributions and their relationships were examined to evaluate physical-chemical processes occurring in the study area. Potential contaminant sources were used to divide the Basin into three areas: Area 1 to the east, Area 2 in the west and Area 3 in the center. Bivariate analysis was used to uncover differences between the areas. The waters in Area 1 are potentially impacted primarily from oil field waters. Sources present in Area 2 include lignite beds and oil …
Date:
May 2001
Creator:
Alderman, John H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Guilt and Shame as They Relate to Combat Posttraumatic Stress Disorder (PTSD): An Analysis of Trauma Content And Resulting Symptomatology
This study began testing the Sewell and Williams (in press) model that differing trauma types yield differing presentations in social versus event processing domains. Other hypotheses explored trauma type with levels of guilt, and shame-proneness with anxiety. Volunteers were 44 male combat veterans being treated for PTSD. Data analyses determined whether trauma type related to guilt and perceived social support and whether shame-proneness related to levels of anxiety. High shame persons may process anxiety and social support differently than low shame persons. Results can assist professionals understand how a person's functioning is affected by certain types of trauma. Future research should focus on increasing social support for persons who have experienced trauma.
Date:
May 2001
Creator:
Taber, Iris
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Portrait of Your Stream: Development and Assessment of a Stream Ecology Program for Middle-School Student
Portrait of Your Stream (POYS) is a stream ecology and student action program designed for use with middle-school students. The program is correlated with learning cycle pedagogical methods emphasizing student-centered lessons and activities in both classroom and outdoor settings. Implementation of a pilot program in the Fall semester of 1999 was used to collect formal and informal responses and data from students and teachers. Data included changes in student knowledge, skills and attitudes and were analyzed for determination of the success of program objectives and modifications to the program. The final POYS program is currently distributed and administered by the Botanical Research Institute of Texas.
Date:
May 2001
Creator:
Swirczynski, Brenda J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Southland, The Completion Of a Dream: The Story Behind Southern Newsprint's Improbable Beginnings
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Use of this item is restricted to the UNT Community
The purpose of this thesis is to explore the creative process behind Southland Paper Mills, the South's first newsprint factory. The thesis describes the conditions leading to the need for southern newsprint. It then chronicles, through the use of company records, the difficult challenges southern newsprint pioneers faced. The thesis follows the company history from the gem of an idea during the mid 1930's through the first decade of the Southland's existence. The paper concludes with the formative years of the company in the 1940's.
Date:
May 2001
Creator:
McGrath, Charles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effect of Faculty Development on Active Learning in the College Classroom
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This study examined the effect of active learning seminars and a mentoring program on the use of active learning teaching techniques by college faculty. A quasi-experimental study was conducted using convenience samples of faculty from two private Christian supported institutions. Data for the study were collected from surveys and faculty course evaluations. The study lasted one semester. Faculty volunteers from one institution served as the experimental group and faculty volunteers from the second institution were the comparison group. The experimental group attended approximately eight hours of active learning seminars and also participated in a one-semester mentoring program designed to assist faculty in application of active learning techniques. Several individuals conducted the active learning seminars. Dr. Charles Bonwell, a noted authority on active learning, conducted the first three-hour seminar. Seven faculty who had successfully used active learning in their classrooms were selected to conduct the remaining seminars. The faculty-mentoring program was supervised by the researcher and conducted by department chairs. Data were collected from three surveys and faculty course evaluations. The three surveys were the Faculty Active Learning Survey created by the researcher, the Teaching Goals Inventory created by Angelo and Cross, and the college edition of Learner-Centered Practices by Barbara …
Date:
May 2001
Creator:
Evans, Cindy
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effect of Steroid Dose Regimen on the Relationship Between Lower Extremity Muscle Function and Cardiac Function in Post Heart Transplant Patients
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Differences in cardiovascular/aerobic function in heart transplant patients might be attributed to the rate of corticosteroid withdrawal and/or to skeletal muscle function. This hypothesis was tested among nine male, cardiac transplant recipients. Prednisone dosage was monitored, and isokinetic strength testing was performed at 4 different time periods throughout the first year post-transplantation. Cardiovascular/aerobic measurements were obtained at the fourth time period. Pre-surgery characteristics were obtained from the patient's medical record. Significant Pearson-product moment correlations were only found between muscle function and aerobic function and between pre-surgery characteristics and cardiovascular/aerobic performance. The results of this study show no evidence that rapid reduction of prednisone dosage enhances aerobic function by benefiting skeletal muscle function.
Date:
May 2001
Creator:
Galatas, Mary V.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Extensions to Jinni Mobile Agent Architecture
We extend the Jinni mobile agent architecture with a multicast network transport layer, an agent-to-agent delegation mechanism and a reflection based Prolog-to-Java interface. To ensure that our agent infrastructure runs efficiently, independently of router-level multicast support, we describe a blackboard based algorithm for locating a randomly roaming agent. As part of the agent-to-agent delegation mechanism, we describe an alternative to code-fetching mechanism for stronger mobility of mobile agents with less network overhead. In the context of direct and reflection based extension mechanisms for Jinni, we describe the design and the implementation of a reflection based Prolog-to-Java interface. The presence of subtyping and method overloading makes finding the most specific method corresponding to a Prolog call pattern fairly difficult. We describe a run-time algorithm which provides accurate handling of overloaded methods beyond Java's reflection package's limitations.
Date:
May 2001
Creator:
Tyagi, Satyam
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Essercizii musici: A Study of the Late Baroque Sonata
Telemann's Essercizii musici is a seminal publication of the 1730's representative of the state of the sonata in Germany at that time. Telemann's music has been largely viewed in negative terms, presumably because of its lack of originality, with the result that the collection's content has been treated in a perfunctory manner. This thesis presents a reappraisal of the Essercizii musici based on criteria presented in Quantz's Versuch. A major source of the period, the Versuch provides an analytical framework for a deeper understanding of the sonatas that comprise Telemann's last publication. A comparison of contemporary publications of similarly titled collections establishes an historical framework for assessing the importance of the Essercizii musici as part of a tradition of publications with didactic objectives that may be traced to the late 17th century.
Date:
May 2001
Creator:
Volcansek, Frederick Wallace
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Virtual teams: The relationship between organizational support systems and effectiveness
This study investigates the effects of eight organizational support systems on virtual team effectiveness in five areas: communication, planning tasks and setting goals, solving problems and making decisions, resolving conflict, and responding to customer requirements. One hundred and eighty surveys were sent to information technology managers and collaborative team members, representing 43 companies. The results indicated that developing new roles for IT professionals and senior managers significantly increased virtual team effectiveness in several areas. The findings support the theory that organizations that utilize virtual teams must create high-level structures, policies, and systems to support the teams and the information tools they use.
Date:
May 2001
Creator:
Townsley, Carole
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Teachers' Use of Children's Literature, Mathematics Manipulatives, and Scaffolding to Improve Preschool Mathematics Achievement: Does It Work?
The primary purpose of this study was to determine if the implementation of an intervention involving teachers' use of children's literature, related storybook manipulatives, and a scaffolding (LMS) approach to learning would improve preschool children's mathematics test scores. Additionally, the LMS approach was examined to determine whether teachers' perceptions of their effectiveness in mathematics instruction changed from the beginning to the end of the study. The subjects of the study included 60 preschool-aged children and six teachers from two child care centers. The preschool teachers participated in either a control or experimental condition (the LMS approach) in their daily mathematics instruction with their preschool children. The researcher tested the children using the Test of Early Mathematics Ability and an abbreviated version of the Stanford-Binet Intelligence Scale. The study was based on two main research questions. The first question asked if there was a difference in the Test of Early Mathematics Ability total posttest scores between children in the literature-manipulatives-scaffolding intervention group and children in the control group after assuring equivalency of the two groups. The second question addressed if preschool teachers believed they were more effective in their mathematics instruction after implementing the LMS approach with young children. The answer …
Date:
December 2000
Creator:
Bennett, Tisha L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Thresholds in avian communities at multiple scales: Relationships between birds, forests, habitats, and landscapes in the Ray Roberts greenbelt, Denton
Environmental management agencies make efforts to reduce pollution loading in streams and rivers by promoting vegetated buffer zones between human activity and water. Most of these efforts do not mesh water quality-based buffer zone width requirements with conservation and wildlife values, specifically, the use of these riparian forest corridors for wildlife dispersal between habitats in highly fragmented landscapes. Forest interior birds are of the most concern to management in riparian forests due to their population declines across much of their breeding range. This dissertation investigates the role that landscape-level and habitat-level factors play on the presence of breeding birds in riparian forests, particularly the landscape and habitat factors that are influenced by human-caused fragmentation. This study describes research at the Ray Roberts Greenbelt, Denton, Texas, that explores the relationships between the landscape and forest habitats of the Greenbelt with its breeding bird community. The major findings of this study are that bird communities in the corridor forests are associated with a greater array of factors than are bird communities in patches, suggesting that the birds of patch forests are somewhat insulated from landscape-scale effects. Also, habitat values can be maintained in corridors, but there does not seem to be a …
Date:
December 2000
Creator:
Barry, Dwight
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Feigning Cognitive Deficits on Neuropsychological Evaluations: Multiple Detection Strategies
Individuals undergoing forensic neuropsychological evaluation frequently stand to gain in some manner if neurocognitive dysfunction is diagnosed. As a result, neuropsychologists are customarily asked to test for neurocognitive feigning during the assessment. The current study employed an analogue design with a clinical comparison group to examine the utility of the TOCA (Rogers, 1996) as a measure of feigned neurocognitive impairment. Two groups of simulators (one cautioned about the presence of detection strategies and one not cautioned) were compared to clinical and normal control groups. Fourteen scales were developed based on five detection strategies: symptom validity testing, performance curve, magnitude of error, response time, and floor effect. Each was employed during both verbal and nonverbal tasks. Significant differences were revealed among groups when subjected to ANOVA. Classification rates from subsequent utility estimates and discriminant function analyses on the scales ranged from 58.8% to 100%. Combining strategies yielded a classification rate of 95.7%. The effect of cautioning simulators was modest; however, a trend was noted on some scales for cautioned simulators to appear less obviously impaired than noncautioned. Although the results require crossvalidation, preliminary data suggest that the TOCA is a sensitive and specific measure of feigned neurocognitive performance. Strengths and weaknesses …
Date:
December 2000
Creator:
Bender, Scott D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A Transcription of Op. 94 Morceau de Concert, by Camille Saint-Saëns For Solo Bass Trombone and Brass Ensemble
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The transcription is an addition to the repertoire for brass ensemble and bass trombone. Consideration is given to the nineteenth-century orchestration treatises of Berlioz and Strauss as well as the twentieth-century texts of Erik Leidzén, Walter Piston, and Samuel Adler. The transcription process is shaped by the principles of these writers. The score is contained in the appendix.
Date:
May 2001
Creator:
Woods, Christopher P.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Equivalency of paper-pencil tests and computer-administered tests.
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Use of this item is restricted to the UNT Community
Are computer-administered versions of a multiple choice paper-pencil test equivalent? This study determined whether there were any significant differences between taking a traditional pencil-paper test and taking the same test using a computer. The literature has shown that there are intervening variables that have caused differences when not controlled. To prove equivalency between test modes, scores have to have similar means, dispersions, and shapes; the ranked-order of the scores must also be similar. Four tests were given over the course of a 16-week semester. The sample was divided, half taking paper-pencil tests and half taking the same test administered by a computer. The mode of administration was switched with each test administration. The analysis showed that, when the intervening variables were controlled, the two modes of administration were equivalent. The analysis used a 2x4 ANOVA, which showed no difference between test modes, but showed that each test administration was significantly different. The Levene statistic was used to test whether dispersions were equivalent and confidence intervals were established to test the kurtosis and skewness statistics. Finally, each of the test scores were transformed into their Normal Curve Equivalents so that Pearson's coefficient could be used to determine the equivalency of the …
Date:
May 2001
Creator:
Whitworth, Clifford K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library