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419 Matching Results
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Phase Separation and Second Phase Precipitation in Beta Titanium Alloys
The current understanding of the atomic scale phenomenon associated with the influence of beta phase instabilities on the evolution of microstructure in titanium alloys is limited due to their complex nature. Such beta phase instabilities include phase separation and precipitation of nano-scale omega and alpha phases in the beta matrix. The initial part of the present study focuses on omega precipitation within the beta matrix of model binary titanium molybdenum (Ti-Mo) alloys. Direct atomic scale observation of pre-transition omega-like embryos in quenched alloys, using aberration-corrected high resolution scanning transmission electron microscopy and atom probe tomography (APT) was compared and contrasted with the results of first principles computations performed using the Vienna ab initio simulation package (VASP) to present a novel mechanism of these special class of phase transformation. Thereafter the beta phase separation and subsequent alpha phase nucleation in a Ti-Mo-Al ternary alloy was investigated by coupling in-situ high energy synchrotron x-ray diffraction with ex-situ characterization studies performed using aberration corrected transmission electron microscopy and APT to develop a deeper understanding of the mechanism of transformation. Subsequently the formation of the omega phase in the presence of simultaneous development of compositional phase separation within the beta matrix phase of a …
Date:
May 2011
Creator:
Devaraj, Arun
System:
The UNT Digital Library
Advancements in Instrumentation for Fourier Transform Microwave Spectroscopy
The efforts of my research have led to the successful construction of several instruments that have helped expand the field of microwave spectroscopy. The classic Balle-Flygare spectrometer has been modified to include two different sets of antenna to operate in the frequency ranges 6-18 GHz and 18-26 GHz, allowing it to function for a large range without having to break vacuum. This modified FTMW instrument houses two low noise amplifiers in the vacuum chamber to allow for the LNAs to be as close to the antenna as physically possible, improving sensitivity. A new innovative Balle-Flygare type spectrometer, the efficient low frequency FTMW, was conceived and built to operate at frequencies as low as 500 MHz through the use of highly curved mirrors. This is new for FTMW techniques that normally operate at 4 GHz or higher with only a few exceptions around 2 GHz. The chirped pulse FTMW spectrometer uses horn antennas to observe spectra that span 2 GHz versus the standard 1 MHz of a cavity technique. This instrument decreases the amount of time to obtain a large spectral region of relative correct intensity molecular transitions. A Nd:YAG laser ablation apparatus was attached to the classic Balle-Flygare and chirped …
Date:
August 2011
Creator:
Dewberry, Christopher Thomas
System:
The UNT Digital Library
"It's Technical": Exploring the Determinents to Technical Probation Revocations Among Felony Probationers
Within the United States, probation has customarily been used as a way to divert offenders away from prison. Over the past two decades the number of offenders who are sentenced to probation has increased tremendously. While there have been more offenders sentenced to probation, there has also been an increase in the number of probationers having that sentence revoked. The most prevalent type of revocation is a technical revocation. Probationers receive technical violations culminating in a revocation when they fail to satisfy the conditions of their probation sentence such as attending rehabilitative programming. The present study adds to the literature on technical revocations by examining characteristics of felony probationers from a large Southern state who were revoked between January 1, 2008 and December 31, 2009. Findings revealed that female probationers, older probationers, white probationers, and those probationers who had not completed high school were significantly more likely to be revoked for a technical revocation. Implications for practice and suggestions for future research based on these findings are discussed.
Date:
May 2011
Creator:
Dixon, Ashford Leon
System:
The UNT Digital Library
Intuitive Eating Scale: An Examination Among Adolescents
Intuitive eating assesses the degree to which individuals eat based on physiological cues rather than emotional or situational cues. The Intuitive Eating Scale was initially developed using college women. This study extends the work of Tylka and reports on the psychometric evaluation of the Intuitive Eating Scale (IES) in a sample of 515 middle school boys and girls. Exploratory factor analysis uncovered 4 factors: unconditional permission to eat, eating for physical rather than emotional reasons, trust in internal hunger/satiety cues and awareness of internal hunger/satiety cues; confirmatory factor analysis suggested that this 4-factor model adequately fit the data after 4 items with low factor loadings were deleted. Supporting its construct validity, IES scores were negatively related to body mass index, body dissatisfaction, negative affect, pressure for thinness, and internalization of the thin ideal, and were positively related to satisfaction with life, and experiencing greater positive affect.
Date:
December 2011
Creator:
Dockendorff, Sally A.
System:
The UNT Digital Library
Analysis of Micro Enterprise Clusters in Developing Countries: A Case Study of Toluca, Mexico.
Businesses cluster to achieve agglomeration benefits. However, research in developing countries suggests that the economic environment limits small business’ propensity to benefit from agglomerations. The study examines the location, networking patterns, formal structures and owner characteristics of 1256 micro businesses from ten industries and thirteen sample areas in Toluca, Mexico. First, the thesis analyses whether clustering has a positive impact on the success rates of the surveyed enterprises, e.g. higher sales per employee. On an industry scale only Retail benefits from agglomerations economies. However, results of the neighborhood data show that specific areas benefit from urbanization economies. Overall, the study finds that businesses located within agglomerations, have higher levels of formalization, networking and professional training, hence constituting a more sophisticated base for economic development. Conclusions can be drawn for development policies and programs, arguing for a more differentiated approach of small business development depending on business location and cluster characteristics.
Date:
August 2011
Creator:
Drauschke, Kristin
System:
The UNT Digital Library
Ecological Analysis of Physical Activity and Health-related Quality of Life in Female College Students.
Health-related quality of life (HRQOL) is a comprehensive construct including physical and psychosocial health functioning. Despite significant health benefits of regular physical activity (PA), over 40% of female college students do not meet recommended PA guidelines to improve their health. This study investigated the influences of individual, social, and physical environmental factors on students’ PA and HRQOL. Participants were 235 female university students who completed validated surveys assessing their perceptions of PA, HRQOL, and social ecological factors. Three hierarchical regressions revealed individual and physical environmental factors as predictors of PA and HRQOL. These findings indicated health professionals need to consider students’ individual factors and physical environmental factors to promote female students’ PA and HRQOL.
Date:
December 2011
Creator:
Dunn, Jacqueline
System:
The UNT Digital Library
Acculturation, Acculturative Stress, and Anxiety Among Hispanic Undergraduates
First generation college students face some unique challenges in the pursuit of higher education. Aside from academic stressors, there are stressors related to social and cultural transitions which may exacerbate pre-existing emotional or psychological distress. Research suggests that acculturation influences psychological well-being and development. The current study examined the relationships between acculturation, acculturative stress, socio-economic status, and symptoms of anxiety among first-generation college students of Hispanic origin. Participants (N = 125) included those who were first in their family to attend college and were primarily female, of traditional college age, and of Mexican heritage. All measures were self-report and were completed online. Overall, this study was inconclusive as most analyses were underpowered. The present study failed to support a relationship between style of acculturation and symptoms of anxiety, although, experiencing Anglo marginality was related to high levels of acculturative stress and anxiety. Finally, regression analysis revealed that acculturative stress, age, and Anglo marginalization were significant predictors of anxiety and accounted for 31% of variance in anxiety. Implications of the present study were discussed. Further study with adequate power is highly recommended.
Date:
May 2011
Creator:
Durón, Kelly M.
System:
The UNT Digital Library
Psychosocial Determinants of Diabetic Control and Satisfaction with Diabetes Care
Diabetes mellitus affects 7.8% of the American population. National health statistic data and other research shows that racial/ethnic disparities exist in terms of prevalence and treatment outcomes. The present study investigated the role of patient health beliefs (i.e., locus of control, self-efficacy) and the doctor-patient relationship (e.g., satisfaction and collaboration with health care provider), as relative predictors of diabetic control (i.e., HbA1c levels) and overall satisfaction with diabetes care, in older adult participants with diabetes. Demographic, psychosocial, and diabetes-related data from the Health and Retirement Study (HRS) 2003 Diabetes Study were analyzed to compare treatment outcomes among non-Hispanic White, non-Hispanic Black, and Hispanic individuals with various types of diabetes. Non-Hispanic White individuals exhibited better diabetic control than their minority counterparts (F(2, 592) = 7.60, p < .001); however, no significant group differences were noted in terms of psychosocial factors. Diabetic control was best predicted by time since diagnosis (β = -.21, p < .001), satisfaction with diabetes self-care (β = .19, p < .001) and age (β = .12, p < .01). In addition, satisfaction with provider care was best predicted by perceived collaboration with provider (β = .44, p < .001), satisfaction with diabetes self-care (β = .22, p …
Date:
May 2011
Creator:
Dzivakwe, Vanessa G.
System:
The UNT Digital Library
Directions Toward a “Happy Place”: Metaphor in Conversational Discourse
This paper aims to show how people use and understand metaphorical language in conversational discourse. Specifically, I examine how metaphorical language has the potential to be either effective or ineffective in its usage, and how they are bound to the contextual environment of the conversation. This particular setting is a conversation between a researcher and a participant involved in a therapeutic program. Metaphorical language is shown to be helpful for understanding difficult subjects; however, I found most metaphorical occurrences ineffective in meaning-making. Often these ineffective metaphors are elaborated or repeated throughout the discourse event, creating problems with cohesion and understanding. Metaphor use in conversation is an effective rhetorical tool for creating meaning, but it is also a problematic device when it comes to aligning participants' conversational goal.
Date:
December 2011
Creator:
Edwards, Jonathan Ryan
System:
The UNT Digital Library
Characterization of Triclocarban, Methyl- Triclosan, and Triclosan in Water, Sediment, and Corbicula Fluminea (Müller, 1774) Using Laboratory, in Situ, and Field Assessments
In the last decade emerging contaminants research has intensified in a bid to answer questions about fate, transport, and effects as these chemicals as they get released into the environment. The chemicals of interest were the antimicrobials; triclocarban (TCC) and triclosan (TCS), and a metabolite of triclosan, methyl triclosan (MTCS). This research was designed to answer the question: what is the fate of these chemicals once they are released from the waste water treatment plant into receiving streams. Three different assessment methods; field monitoring, in-situ experiments, and laboratory studies were used to answer the overall question. TCS, TCC, and MTCS levels were measured in surface water, sediment and the Asiatic clam Corbicula fluminea. Field studies were conducted using four sites at Pecan Creek, Denton TX. Levels of all three chemicals in clams were up to fives orders of magnitude the water concentrations but an order of magnitude lower than in sediment. Highest sediment levels of chemicals were measured in samples from the mouth of Pecan Creek (highest organic matter). TCC was the most and TCS was the least accumulated chemicals. In-situ and lab studies both indicated that uptake of these chemicals into the clams was very rapid and measurable within …
Date:
May 2011
Creator:
Edziyie, Regina E.
System:
The UNT Digital Library
Tesla Turbine Torque Modeling for Construction of a Dynamometer and Turbine
While conventional turbines have been extensively researched and tested, Tesla and boundary layer type turbines have not. In order to construct a dynamometer, thermodynamic flow apparatus and future turbines, we modeled the Tesla turbine using theoretical calculations and preliminary experiments. Thus a series of experiments were run to determine stall torque and maximum run speed for a known pressure range. This data was then applied to modeling formulas to estimate stall torque over an extended range of variables. The data were then used to design an appropriate dynamometer and airflow experiment. The model data also served to estimate various specifications and power output of the future turbine. An Obi Laser SSTG‐001 Tesla turbine was used in the experiments described. Experimental stall torque measurements were conducted in two stages. Shaft speed measurements were taken with an optical laser tachometer and Tesla turbine stall torque was measured using a spring force gauge. Two methods were chosen to model Tesla turbine stall torque: 1) flow over flat plate and 2) free vortex with a sink. A functional dynamometer and thermodynamic apparatus were constructed once the model was confirmed to be within the experimental uncertainty. Results of the experiments show that the experimental turbine …
Date:
May 2011
Creator:
Emran, Tamir Ali
System:
The UNT Digital Library
The Effects of a Self-Monitoring Procedure on Sustainable Behavior
Self-monitoring procedures are commonly used to assess environmentally sustainable behavior. The current experiment evaluated the effects of a self-monitoring procedure on two sustainable behaviors within a university office. A senior assistant was asked to report on light usage and energy-saver use on the copier in an office break room. Her reports were then compared with independent observations. Results showed that her reports were highly correspondent with independent observations although no change in target behaviors occurred. Changes in behavior occurred when she was asked to engage in the target behaviors. Results suggest that although self-monitoring procedures can correctly assess sustainable behaviors, they may not be suitable for behavior change.
Date:
August 2011
Creator:
Eni, Chinedu Peter
System:
The UNT Digital Library
Fashion-brand Experiences in Multi-channel Retailing: Impacts of Experience Dimensions and Experience Types on Brand Resonance
The brand behind the garment is what gives the product popularity, relevance to the consumer, and overall profitability. As time passes, markets are becoming flooded with more brands that inherently provide the commodities. As a result, fashion marketers must put more time and investment into stipulating ways for which their brand can reach a select target consumer and enhance repeat purchase intentions with their competitive differentiations. As their efforts engage, an experiential perspective emerges in the fashion industry. By comparing fashion brands and their different distribution channels, the objectives of this study are to identify consumers’ perceptions of fashion brand experience dimensions and experience types, and to investigate the effect of brand experience dimensions and types on brand resonance. Upon extending Schmitt and Brakus, Schmitt, and Zarantonello’s experience dimensions and types, in conjunction with Keller’s brand resonance model, 12 out of 20 hypotheses confirm the significant impact of consumers experiences on brand resonance by analyzing the data (n = 374) from a university in the United States. Sensory and affective experiences are primary factors for establishing fashion brand association, while cognitive and relational driven experiences lead to establishing fashion brand loyalty. Sensory, affective, and relational experiences affect both product and …
Date:
December 2011
Creator:
Evans, Leslie J.
System:
The UNT Digital Library
An Exploratory Study of Factors Influencing the Effectiveness of the Amob/vll Program for Participants in North Central Texas
This study assessed falls efficacy and confidence-related changes among participants attending the a Matters of Balance/Volunteer Lay Leader (AMOB/VLL) falls prevention program for older adults, based on their residential location. Data were examined from 431 older Texans enrolled in AMOB/VLL during a two-year period, and assessed at baseline and post-intervention. Results indicate that participants significantly increased falls efficacy, reduced activity interference due to their health, and decreased the number of days limited from usual activity. Regression models show that participants, despite entering the program with lower reported health status, reported greater rates of positive change for falls efficacy and health interference compared with their baseline pre-intervention counterparts. Overall program attendance and attendance at major sessions showed the greatest influence. Findings contribute to the understanding of cognitive restructuring and strengthening variations with falls prevention program outcomes.
Date:
December 2011
Creator:
Ewing, Charles W.
System:
The UNT Digital Library
Hispanic Women Leaders in K‒12 Public Education: Overcoming Barriers to Success
Scholarly research has been written on the forces behind the barriers preventing Hispanic women from reaching the top of the public school ladder. These barriers are to be recognized and addressed. This study focuses not on the barriers which hinder forward and upward career movement, but instead examines how many Hispanic American women have not allowed these barriers to prevent them from achieving their goals of attaining the principalship. This study seeks to determine how Hispanic women principals came to grips with the challenges and barriers to promotion, and to success as K‒12 school leaders. This qualitative research study consisted of 12 Hispanic female school principals from the Dallas/Fort Worth metropolitan area. The three districts selected were Fort Worth Independent School District, Arlington Independent School District, and Grand Prairie Independent School District. Three principals were from Grand Prairie Independent School District, two principals were from Arlington Independent School District, and seven principals were from the Fort Worth Independent School District. All of the 12 Hispanic school principals were interviewed. From the responses to each of the questions, themes became evident. The themes expressed what individual principals had done and the strategies they used to overcome the varied barriers which they …
Date:
May 2011
Creator:
Falk, Cora Torres
System:
The UNT Digital Library
Strong Choquet Topologies on the Closed Linear Subspaces of Banach Spaces
In the study of Banach spaces, the development of some key properties require studying topologies on the collection of closed convex subsets of the space. The subcollection of closed linear subspaces is studied under the relative slice topology, as well as a class of topologies similar thereto. It is shown that the collection of closed linear subspaces under the slice topology is homeomorphic to the collection of their respective intersections with the closed unit ball, under the natural mapping. It is further shown that this collection under any topology in the aforementioned class of similar topologies is a strong Choquet space. Finally, a collection of category results are developed since strong Choquet spaces are also Baire spaces.
Date:
August 2011
Creator:
Farmer, Matthew Ray
System:
The UNT Digital Library
Texas High School Principals' Attitudes Toward the Inclusion of Students with Disabilities in the General Education Classroom
This study examined Texas high school principals' attitudes toward the inclusion of students with disabilities in the general education classroom. School leaders today face increasing demands with the revised state accountability system. For example, students with disabilities are required to take the Texas Assessment Knowledge and Skills Test (TAKS) and on grade level. Hence, one of the strategies of schools has been to mainstream or include special education students in the regular classroom. Inclusion provides the opportunity for students with disabilities to be educated in the general education curriculum with their non-disabled peers. This study investigated the attitudes of Texas high school principals' attitudes toward the inclusion of students with disabilities in the general education classroom. The principals' personal experiences, professional training, and formal training in inclusion were examined. This study was a qualitative study using survey methodology. The Principal's Inclusion Survey developed by Cindy Praisner and G.H. Stainback was distributed electronically to 1211 Texas high schools. With the permissions of Praisner and Stainback, the survey was loaded into Survey Monkey, which is a website for creation of professional online surveys. Data was analyzed using descriptive statistics. The return rate was 395 (32.1%) overall responses. The results of the study …
Date:
May 2011
Creator:
Farris, Troy K.
System:
The UNT Digital Library
Are Alzheimer's Special Care Units Really Special? Effects of Residential Status on Family Members' Perspectives on High Quality Care for their Loved-Ones in Long-Term Care
This analysis of secondary data collected from family members of nursing home residents in North Texas (n = 422) used a mixed methods approach to determine if there is a difference in perspectives on quality care among family members of Alzheimer’s/Dementia Special Care Unit (ADSCU) residents compared to those of non-ADSCU residents. Descriptive content analysis was used identify and condense responses to an open-ended question into four meaningful categories of qualities of care. An independent t-test was employed to determine if there was a difference between family members of ADSCU residents and family members of non-ADSCU residents regarding their rating of their loved-ones’ nursing home on the important qualities of care they identified from the open-ended question. Closed-ended questions were organized into indices of these qualities of care, and ordinary least square regression was employed to determine if there were significant differences between perceptions of family members of ADSCU residents and those of non-ADSCU residents regarding care their loved-ones are receiving on these qualities of care, controlling for frequency of visit.
Date:
August 2011
Creator:
Fawcett, Elizabeth Jean
System:
The UNT Digital Library
Effects of Defensiveness on the Reporting of Personality Disorder Symptoms
Personality disorders are not granted the same clinical attention accorded Axis I disorders despite their instrumental role in treatment and outcome. Even when standardized assessments are used, their clinical utility may be limited by an overly favorable self-presentation. The current study focused on defensiveness, the intentional denial of symptomatology, by examining individuals’ ability to minimize their presentation on personality disorder diagnostic measures. Using a within-subjects simulation design, dually diagnosed inpatients were assessed under both honest and defensive conditions. The study used self-report (Structured Clinical Interview for DSM-IV – Axis II – Personality Questionnaire, SCID-II-PQ) and interview-based (Structured Interview for DSM-IV Personality, SIDP-IV) diagnostic measures and a self-report measure of favorable self-presentation (Paulhus Deception Scales, PDS). The inpatients were quite capable of hiding maladaptive personality traits on diagnostic measures, with similarly large effect sizes on both the SCID-II-PQ and SIDP-IV. In addition to the PDS, two new detection strategies for identifying defensiveness showed promise.
Date:
December 2011
Creator:
Fiduccia, Chelsea E.
System:
The UNT Digital Library
Mary Jones: Last First Lady of the Republic of Texas
Abstract This dissertation uses archival and interpretive methods to examine the life and contributions of Mary Smith McCrory Jones in Texas. Specifically, this project investigates the ways in which Mary Jones emerged into the public sphere, utilized myth and memory, and managed her life as a widow. Each of these larger areas is examined in relation to historiographicaly accepted patterns and in the larger context of women in Texas, the South, and the nation during this period. Mary Jones, 1819-1907, experienced many of the key early periods in Anglo Texas history. The research traces her family’s immigration to Austin’s Colony and their early years under Mexican sovereignty. The Texas Revolution resulted in her move to Houston and her first brief marriage. Following the death of her husband she met and married Anson Jones, a physician who served in public posts throughout the period of the Texas Republic. Over time Anson was politically and personally rejected to the point that he committed suicide. This dissertation studies the effects this death had upon Mary’s personal goals, her use of a widow’s status to achieve her objectives, and her eventual emergence as a “Professional Widow.” Mary Jones’s attempts to rehabilitate her husband’s public …
Date:
December 2011
Creator:
Fish, Birney Mark
System:
The UNT Digital Library
Terror Management Theory and Body Image
Research has not explicitly examined the link between key components of terror management theory (TMT) and body image without the use of mortality salience. This project explored the link between cultural worldview, self-esteem, body image, and death anxiety. Multiple measures were used to create a structural equation model examining relationships between body image and death anxiety as mediated by body image in the context of TMT. The proposed model did not fit the data. Minor modifications were made to the model keeping within the proposed theoretical perspective. In the modified model the relationships between cultural worldview and death anxiety as mediated by body image were either non-existent or weak. Hierarchical regression analyses did suggest that some aspects of body image indeed did predict some, but not all dimension of death anxiety in this sample of young adults.
Date:
December 2011
Creator:
Fish, Joshua Stephen Andrus
System:
The UNT Digital Library
The Organic-Progressive Principle in the Political Thought and Internationalism of Woodrow Wilson
This is an investigation of the intellectual roots of the political thought and internationalism of Woodrow Wilson, the twenty-eightieth president of the United States. Exposed to the influence of Darwin, Wilson believed that politics had to be redefined as an evolutionary process. the older mechanical understanding of politics was to be replaced with an organic understanding of political development. This allowed Wilson to synthesize a concept of politics that included elements from the Christian tradition; the English Historical School, particularly Edmund Burke; and German idealism, including G.W.F. Hegel. However, because he placed a heavy emphasis on Burke and Hegel, Wilson moved away from a natural rights based theory of politics and more towards a politics based on relativism and a transhistorical notion of rights. Wilson had important theoretical reserves about Hegel, as a result, Wilson modified Hegel’s philosophy. This modification took the form of Wilson’s organic-progressive principle. This would greatly affect Wilson’s ideas about how nations formed, developed, and related to one another. This study focuses on Wilson’s concept of spirit, his theory of history, and his idea of political leadership. the organic-progressive principle is key to understanding Wilson’s attempts to reform on both the domestic and international levels.
Date:
December 2011
Creator:
Flanagan, John Patrick
System:
The UNT Digital Library
The Parent-Initiated Task Motivational Climate and Factors Influencing Eighth Grade Boys’ Intention to Continue Sports
The motivational climate, as defined by parents’ behaviors, and athletes’ goal orientations are essential in understanding children’s experiences with sport. The purpose of this study was to examine the perceived motivational climate created by parents, and its relationship to psychological outcomes experienced by adolescent male athletes in youth sports. In particular, the parent created task climate was examined through its influence on goal orientation and subsequently to psychological outcomes experienced in sport, specifically, sport competence, self-esteem, enjoyment, and intention to continue participating in sport. Participants were 405 8th grade male athletes (mean age = 13.5); (Sample A: n = 205; Sample B: n = 200). As expected, the task-oriented parent initiated motivational climate was associated with the boys’ mastery goal orientation. Participants with higher mastery goal orientation had greater sport competence, self-esteem, and more enjoyment in sport. Intention to continue playing sport was predicted primarily by their level of enjoyment, and secondarily by their increased feelings of self-esteem.
Date:
August 2011
Creator:
Force, Erica C.
System:
The UNT Digital Library
Processing Instruction and Teaching Proficiency Through Reading and Storytelling: A Study of Input in the Second Language Classroom
This paper reports a study of VanPatten's processing instruction (PI) and Ray's TPRS. High school students in a beginning Spanish course were divided into three groups (PI, TPRS, and control) and instructed in forms using the Spanish verb gustar. Treatment included sentence-level and discourse-level input, and tests included interpretation and production measures in a pretest, an immediate posttest, and a delayed posttest given two and a half months following treatment. The PI group made the greatest gains in production measures and in a grammaticality judgment test, and the TPRS group made the greatest gains in written fluency. The PI group's statistical gains in production measures held through the delayed posttest.
Date:
May 2011
Creator:
Foster, Sarah Jenne
System:
The UNT Digital Library