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468 Matching Results
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Detection and Classification of Heart Sounds Using a Heart-Mobile Interface
An early detection of heart disease can save lives, caution individuals and also help to determine the type of treatment to be given to the patients. The first test of diagnosing a heart disease is through auscultation - listening to the heart sounds. The interpretation of heart sounds is subjective and requires a professional skill to identify the abnormalities in these sounds. A medical practitioner uses a stethoscope to perform an initial screening by listening for irregular sounds from the patient's chest. Later, echocardiography and electrocardiography tests are taken for further diagnosis. However, these tests are expensive and require specialized technicians to operate. A simple and economical way is vital for monitoring in homecare or rural hospitals and urban clinics. This dissertation is focused on developing a patient-centered device for initial screening of the heart sounds that is both low cost and can be used by the users on themselves, and later share the readings with the healthcare providers. An innovative mobile health service platform is created for analyzing and classifying heart sounds. Certain properties of heart sounds have to be evaluated to identify the irregularities such as the number of heart beats and gallops, intensity, frequency, and duration. Since …
Date:
December 2016
Creator:
Thiyagaraja, Shanti
System:
The UNT Digital Library
Local Phase Manipulation for Multi-Beam Interference Lithography for the Fabrication of Two and Three Dimensional Photonic Crystal Templates
In this work, we study the use of a spatial light modulator (SLM) for local manipulation of phase in interfering laser beams to fabricate photonic crystal templates with embedded, engineered defects. A SLM displaying geometric phase patterns was used as a digitally programmable phase mask to fabricate 4-fold and 6-fold symmetric photonic crystal templates. Through pixel-by-pixel phase engineering, digital control of the phases of one or more of the interfering beams was demonstrated, thus allowing change in the interference pattern. The phases of the generated beams were programmed at specific locations, resulting in defect structures in the fabricated photonic lattices such as missing lattice line defects, and single-motif lattice defects in dual-motif lattice background. The diffraction efficiency from the phase pattern was used to locally modify the filling fraction in holographically fabricated structures, resulting in defects with a different fill fraction than the bulk lattice. Through two steps of phase engineering, a spatially variant lattice defect with a 90° bend in a periodic bulk lattice was fabricated. Finally, by reducing the relative phase shift of the defect line and utilizing the different diffraction efficiency between the defect line and the background phase pattern, desired and functional defect lattices can be …
Date:
December 2016
Creator:
Lutkenhaus, Jeffrey Ryan
System:
The UNT Digital Library
Two-Phase Spray Cooling with Water/2-Propanol Binary Mixtures for High Heat Flux Focal Source
Two-phase spray cooling has been an emerging thermal management technique offering high heat transfer coefficients and critical heat flux levels, near-uniform surface temperatures, and efficient coolant usage that enables to design of compact and lightweight systems. Due to these capabilities, spray cooling is a promising approach for high heat flux applications in computing, power electronics, and optics. Two-phase spray cooling inherently depends on saturation temperature-pressure relationships of the working fluid to take advantage of high heat transfer rates associated with liquid-vapor phase change. When a certain application requires strict temperature and/or pressure conditions, thermo-physical properties of the working fluid play a critical role in attaining proper efficiency, reliability, or packaging structure. However, some of the commonly used single-component working fluids have relatively poor properties and heat transfer performance. For example, water is the best coolant in terms of properties, yet in certain applications where the system operates at low temperature ambient, it cannot be implemented due to freezing risk. The common solution for this problem is to use the antifreeze mixtures (binary mixtures of water and alcohol) to reduce the freezing point. In such cases, utilizing binary mixtures to tune working fluid properties becomes an alternative approach. This study has …
Date:
December 2016
Creator:
Obuladinne, Sai Sujith
System:
The UNT Digital Library
African American Children in the Jim Crow North: Learning Race and Developing a Racial Identity
This thesis explores how African American children in the North learned race and racial identity during the Jim Crow era. Influences such as literature, media, parental instruction, interactions with others, and observations are examined.
Date:
December 2016
Creator:
Beal, Michele
System:
The UNT Digital Library
Exploratory User Research for a Website that Provides Resources for Educators of American Indian Students in Higher Education
Several studies have indicated that American Indian students in the United States higher education system confront unique challenges that derive from a legacy of colonialism and assimilationist policies (Huff 1997). Several scholars, American Indian and non-Native alike, have explored the effects of this history upon students in higher education (Brayboy 2004; Guillory and Wolverton 2008; Waterman and Lindley 2013). Very few, however, have explored the role of the educators of American Indian students, and most of the literature focuses on K-12 educational settings (McCarty and Lee 2014; Yong and Hoffman 2014). This thesis examines exploratory user research conducted to generate a foundational understanding of educators of American Indian students in higher education. Utilizing methods from design anthropology and user experience, semi-structured interviews and think-aloud sessions were conducted, almost exclusively virtually, for 17 participants. This research was conducted for a client, Fire & Associates, as part of the applied thesis process. Findings revealed a complex web of needs for educators of American Indian students in higher education related to teaching diverse students, the use of media and technology in the classroom, and the process of networking among other educators. The research culminated in content and design implications for the Fire & …
Date:
December 2016
Creator:
Roth, Heather S.
System:
The UNT Digital Library
Using Relational Responding to Examine the Acquisition of Mindfulness and Meditation Material: An Analogue Study
Mindfulness meditation is a growing area of interest for both mental health professionals and the general public alike. Beneficial outcomes are associated with these practices, although the variety of measurement techniques makes research difficult to interpret. Definitions of these constructs are varied, and anecdotal accounts point to the idea that many people hold misconceptions about mindfulness and meditation, even when meanings are made clear. Still, no formal research has been published on misconceptions of mindfulness – or, if they exist, how such misinformation affects acquisition of related skills. Furthermore, mindfulness has been incorporated into therapeutic modalities without much consideration for context, including the client's learning history. The current analogue study examined how the presentation of mindfulness meditations (i.e., inaccurate rationale/meditation and accurate rationale/meditation) affects an individual's practice. Specifically, self-reported mindfulness and meditation skills, mood questionnaires, a matching-to-sample task, and qualitative measurements were used to assess acquisition. Although primary hypotheses did not yield significant findings, results from both preliminary and exploratory analyses demonstrate significant findings with regard to teaching, learning, and measurement related to mindfulness meditation. The results, future directions, and limitations are discussed.
Date:
December 2016
Creator:
Lester, Ethan G.
System:
The UNT Digital Library
Chemical and Electronic Structure of Aromatic/Carborane Composite Films by PECVD for Neutron Detection
Boron carbide-aromatic composites, formed by plasma-enhanced co-deposition of carboranes and aromatic precursors, present enhanced electron-hole separation as neutron detector. This is achieved by aromatic coordination to the carborane icosahedra and results in improved neutron detection efficiency. Photoemission (XPS) and FTIR suggest that chemical bonding between B atoms in icosahedra and aromatic contents with preservation of π system during plasma process. XPS, UPS, density functional theory (DFT) calculations, and variable angle spectroscopic ellipsometery (VASE) demonstrate that for orthocarborane/pyridine and orthocarborane/aniline films, states near the valence band maximum are aromatic in character, while states near the conduction band minimum include those of either carborane or aromatic character. Thus, excitation across the band gap results in electrons and holes on carboranes and aromatics, respectively. Further such aromatic-carborane interaction dramatically shrinks the indirect band gap from 3 eV (PECVD orthocarborane) to ~ 1.6 eV (PECVD orthocarborane/pyridine) to ~1.0 eV (PECVD orthocarborane/aniline), with little variation in such properties with aromatic/orthocarborane stoichiometry. The narrowed band gap indicate the potential for greatly enhanced charge generation relative to PECVD orthocarborane films, as confirmed by zero-bias neutron voltaic studies. The results indicate that the enhanced electron-hole separation and band gap narrowing observed for aromatic/orthocarborane films relative to PECVD orthocarborane, …
Date:
December 2016
Creator:
Dong, Bin
System:
The UNT Digital Library
Loyalty and Fairness: A Study of the Influence of Moral Foundations on Auditors' Propensity to Subordinate their Judgment
Subordination of judgment is a fundamental threat to auditor objectivity. Subordination of judgment occurs when auditors agree with their superiors either in spite of or without forming their own independent judgments. Many audit procedures rely on independent, critical thinking at every level of the audit team; however, a number of studies suggest that auditors tend to agree with superiors even when a superior's views clearly run contrary to generally accepted accounting principles. While there is general agreement among scholars that subordination of judgment is "bad," very little attention has been given to moral biases that might influence an auditor's tendency to subordination of judgment, or to potential remedies that could mitigate an auditor's tendency to subordinate judgment. Moral Foundations Theory suggests that individuals tend to make intuitive, normative evaluations of situations based upon a set of personal moral biases or preferences called "moral foundations." Two specific moral foundations could influence subordination of judgment in divergent ways. The moral foundation of loyalty-respect may make agreement with a superior's views seem more acceptable than would disagreement. Meanwhile, the moral foundation of fairness may make an auditor more sensitive to the observance of rules, resulting in less subordination of judgment when a superior's …
Date:
December 2016
Creator:
Neri, Marc P.
System:
The UNT Digital Library
What's in Your Garden? Assessing the "Eco-friendliness" of Plant Choices of Denton, Texas Gardeners
Urbanization is seen as a threat to biodiversity within urban ecosystems, which are largely reliant on humans for their composition. Two types of extremes exist in the spectrum of urban domestic gardens; on one end, the typical urban garden which is planted by landscapers at the time the house is built and is generally left unchanged, and, at the other, a "wild" landscape planted entirely with native plants which provides habitat for native fauna and pollinators. This study assesses the plant choices made by members of organized gardening groups-the Denton County Master Gardeners (DCMG), the Elm Fork Master Naturalists (EFMN), the Trinity Forks Native Plant Society (TFNPS), and Keep Denton Beautiful (KDB)-and toward which extreme these choices put these gardens on the psectrum. TFNPS and EFMN both fall closer to the wild garden extreme, with TFNPS the closest to a "wild garden." DCMG was almost directly between the two extremes, but fell closer to the typical urban garden. By looking at how these groups manage their gardens, we begin to understand the ways in which gardeners can mitigate and soften the harsh changes between wild landscapes and urban environments. Collaboration between groups could have the potential to encourage more people …
Date:
December 2016
Creator:
Cloutier, Andrea Nicole
System:
The UNT Digital Library
The Relation of Perceived Motivational Climate, Mindset, and Achievement Goal Orientation to Grit in Male High School Soccer Players
Grit is defined as "perseverance and passion for long-term goals." Although studied in relation to various outcomes, such as retention and academic performance, few studies have examined variables that may contribute to grit's development. Further, few studies have examined this construct in relation to sport performance or within athletic environments, despite its clear connection to sport-related constructs like mental toughness and resilience. Thus, based in achievement motivation theory, this study examined the relations of the perceived motivational climate as defined by athletes' perceptions of the coaches' behaviors (task vs. ego), athletes' perceptions of their achievement goal orientation (task vs. ego), athletes' perceptions of their implicit theory (i.e., fundamental beliefs regarding whether or not ability can change; growth vs. fixed), and athletes' perception of their level of grit. Male varsity soccer players (N = 81; Mage = 15.80 ± .81) from a large metropolitan area in the south central U.S. completed questionnaires measuring these achievement motivation constructs. The full regression model was significant, accounting for 18% of the grit variance, F(6, 74) = 2.77, p = .017. Within the full model, having a growth mindset (β = .25, p = .035) and endorsing a task goal orientation (β = .36, p …
Date:
December 2016
Creator:
Albert, Erin D.
System:
The UNT Digital Library
Analyzing Tuberculosis Vulnerability and Variables in Tarrant County
Over 9 million new cases of tuberculosis (TB) were reported worldwide in 2013. While the TB rate is much lower in the US, its uneven distribution and associated explanatory variables require interrogation in order to determine effective strategies for intervention and control. However, paucity of case data at fine geographic scales precludes such research. This research, using zip code level data from 837 confirmed TB cases in Tarrant County obtained from Texas Department of State Health Services, explores and attempts to explain the spatial patterns of TB and related risk markers within a framework of place vulnerability. Readily available census data is then used to characterize the spatial variations in TB risk. The resulting model will enable estimations of the geographic differences in TB case variables using this readily available census data instead of time-consuming and expensive individual data collection.
Date:
December 2016
Creator:
McGlone, John Francis
System:
The UNT Digital Library
A History of Overcoming: Nietzsche on the Moral Antecedents and Successors of Modern Liberalism
This work aims to understand human moral psychology under modern liberalism by analyzing the mature work of philosopher Friedrich Nietzsche. I seek to understand and evaluate Nietzsche's claim that liberalism, rather than being an overturning of slave morality, is an extension of the slave morality present in both Judaism and Christianity. To ground Nietzsche's critique of liberalism theoretically, I begin by analyzing his "master" and "slave" concepts. With these concepts clarified, I then apply them to Nietzsche's history by following his path from Judaism to liberalism and beyond--to his "last man" and Übermensch. I find that Nietzsche views history as a series of overcomings wherein a given mode of power maintenance runs counter to the means by which power was initially attained. Liberalism, as the precursor and herald of the "last man," threatens the end of overcoming and therefore compromises the future of human valuation and meaning.
Date:
December 2016
Creator:
Gill, Rodney W.
System:
The UNT Digital Library
The Creation of Fictional History in the Tequila Industry
The creation of fictional history in the tequila industry due to changes in government policy, trade agreements and big business.
Date:
December 2016
Creator:
Nichols, Cynthia A.
System:
The UNT Digital Library
Improving the Long-term Performance of PVC Compositions
PVC are extensively applied in many fields, such as cables, pipes, vehicles, shoes, toys and infusion bags. Generally, plasticizers are blended with PVC to improve the ability of process in industrial production; however, the toxic plasticizers will gradually migrate to the surface of products and such a leakage results in brittleness of plasticized PVC and environmental pollution. In other words, humans are frequently exposed to the potential risks. According to previous researches, cross-linked PVC was proved that it was able to hinder the migration of plasticizer. Thus, in this research, we selected some commercially used cross-linking agents and employed six different tests based on mechanical, tribological and microscopy analysis in order to seek the best solution against plasticizer migration. Thus, we expected to develop a cross-linked flexible PVC which performed improved long-term performance and extended lifetime.
Date:
December 2016
Creator:
Yang, Yu Chia
System:
The UNT Digital Library
Evolving Curricular Models in Culinary Arts: An Instrumental Case Study of a Technical Field
The purpose of this research study was to examine how chefs and other individuals in the food industry understood the field of culinary arts. This study used an instrumental case study with purposeful sampling of multiple cases. Through a series of open-ended interviews using snowball-sampling strategy that concluded with 45 participants sharing their experiences in culinary education and employment, several themes emerged across all of the interviews: (1) Disempowerment of those who have been successful in the culinary arts; (2) Conflict in the field; and, (3) Needs of employers not being met. Following the analysis of the data, two research questions were inductively formed: (1) How do the participants' understandings vary based upon the three models (apprenticeship, associate degree, and baccalaureate degree) of culinary education? (2) How do these themes vary depending upon the three models of culinary education? What resulted was thick description of the impact of the three models of formal chef education has had on the field of culinary arts, followed by the potential in the development of the baccalaureate degree model as it represented an opportunity for field redefinition in culinary arts. This study produced a set of data revealing that current culinary education has become …
Date:
December 2016
Creator:
Cossio, Allison
System:
The UNT Digital Library
Defect Behaviors in Zinc Oxide and Zinc Titanates Ceramics from First Principles Computer Simulations
ZnO and ZnO-TiO2 ceramics have intriguing electronic and mechanical properties and find applications in many fields. Many of these properties and applications rely on the understanding of defects and defect processes in these oxides as these defects control the electronic, catalytic and mechanical behaviors. The goal of this dissertation is to systematically study the defects and defects behaviors in Wurtzite ZnO and Ilmenite ZnTiO3 by using first principles calculations and classical simulations employing empirical potentials. Firstly, the behavior of intrinsic and extrinsic point defects in ZnO and ZnTiO3 ceramics were investigated. Secondly, the effect of different surface absorbents and surface defects on the workfunction of ZnO were studied using DFT calculations. The results show that increasing the surface coverage of hydrocarbons decreased the workfunction. Lastly, the stacking fault behaviors on ilmenite ZnTiO3 were investigated by calculating the Generalized Stacking Fault (GSF) energies using density functional theory based first principles calculations and classical calculations employing effective partial charge inter-atomic potentials. The gamma-surfaces of two low energy surfaces, (110) and (104), of ZnTiO3 were fully mapped and, together with other analysis such as ideal shear stress calculations.
Date:
December 2016
Creator:
Sun, Wei
System:
The UNT Digital Library
Negotiated Living: An Ethno-Historical Perspective of Punta Allen
Situated within the jurisdiction of the Municipality of Tulum and within the Sian Ka'an Biosphere gives the village of Punta Allen a distinctive agency in determining their role in the on-going development of tourism in the region that is not given to other communities in the state. This unique circumstance facilitates a dialogue between the reserve, the municipality, and the business cooperatives of Punta Allen that produce a negotiated living. Through the negotiations with the reserve and Tulum, the lobster fishing and tourism cooperatives are given the opportunity to have a relatively significant role in determining the future of Punta Allen in regards to tourism.
Date:
December 2016
Creator:
McRae, David Thomas
System:
The UNT Digital Library
Effect of Makerspace Professional Development Activities on Elementary and Middle School Educator Perceptions of Integrating Technologies with STEM (Science, Technology, Engineering, Mathematics)
This study investigated a Makerspace professional development program, the Makers' Guild, provided to teachers within north Texas over the course of a semester. The research employed a constructionist approach delivered via 2D and 3D technologies during STEM instructional activities within a creative space. Participants reported statistically significant increases in self-reported competence in technology integration, confidence levels toward integrating World Wide Web, Emerging Technologies for Student Learning, Teacher Professional Development, and attitudes toward math, technology, science, and STEM careers.
Date:
December 2016
Creator:
Miller, Jennifer R
System:
The UNT Digital Library
An Evaluation of Correspondence between Preference and Performance under a Progressive Ration Schedule with College Students
Preference assessments are used in clinical settings to identify stimuli with reinforcing potential. The progressive-ratio schedule has shown to be useful in clinical assessments in identifying stimuli with stronger reinforcer efficacy that corresponds to formalized assessments.The current study utilized a progressive-ratio schedule to compare videos of high and low preference assessed by verbal reports of preference with college students. Results indicated breakpoints were higher for high preferred videos than low preferred videos for three out of five participants, but preference was not indicative of performance.
Date:
December 2016
Creator:
Johnson, Jamarious
System:
The UNT Digital Library
Ethiopian Coffee Stories: Applied Research with Sidama Coffee Farmers Combining Visual and Ethnographic Methods
The purpose of this study is to demonstrate the value of visual research methods to applied anthropology in the context of exploratory research with farmers in Ethiopia. The three methods of photo-elicitation, participatory photography, and ethnographic film, enrich and expand ethnographic methods to support the client's objective of supporting farmers. The applied project constructs a narrative from the local perspective to help consumers learn more about farmers' lives. The research focuses on specific farmers, and their experiences with direct fair trade and coffee farming. The client sees the application of research produced by ethnographic and visual methods as a good direction not only for his company, but the Fair Trade Industry as a whole.
Date:
December 2016
Creator:
Suter, Paula J.
System:
The UNT Digital Library
Dissimilar Friction Stir Welding Between Magnesium and Aluminum Alloys
Joining two dissimilar metals, specifically Mg and Al alloys, using conventional welding techniques is extraordinarily challenging. Even when these alloys are able to be joined, the weld is littered with defects such as cracks, cavities, and wormholes. The focus of this project was to use friction stir welding to create a defect-free joint between Al 2139 and Mg WE43. The stir tool used in this project, made of H13 tool steel, is of fixed design. The design included an 11 mm scrolled and concave shoulder in addition to a 6 mm length pin comprised of two tapering, threaded re-entrant flutes that promoted and amplified material flow. Upon completion of this project an improved experimental setup process was created as well as successful welds between the two alloys. These successful joints, albeit containing defects, lead to the conclusion that the tool used in project was ill fit to join the Al and Mg alloy plates. This was primarily due to its conical shaped pin instead of the more traditional cylindrical shaped pins. As a result of this aggressive pin design, there was a lack of heat generation towards the bottom of the pin even at higher (800-1000 rpm) rotation speeds. This …
Date:
December 2016
Creator:
Reese, Gregory A
System:
The UNT Digital Library
Sliding Friction and Wear Behavior of High Entropy Alloys at Room and Elevated Temperatures
Structure-tribological property relations have been studied for five high entropy alloys (HEAs). Microhardness, room and elevated (100°C and 300°C) temperature sliding friction coefficients and wear rates were determined for five HEAs: Co0.5 Cr Cu0.5 Fe Ni1.5 Al Ti0.4; Co Cr Fe Ni Al0.25 Ti0.75; Ti V Nb Cr Al; Al0.3CoCrFeNi; and Al0.3CuCrFeNi2. Wear surfaces were characterized with scanning electron microscopy and micro-Raman spectroscopy to determine the wear mechanisms and tribochemical phases, respectively. It was determined that the two HEAs Co0.5 Cr Cu0.5 Fe Ni1.5 Al Ti0.4 and Ti V Nb Cr Al exhibit an excellent balance of high hardness, low friction coefficients and wear rates compared to 440C stainless steel, a currently used bearing steel. This was attributed to their more ductile body centered cubic (BCC) solid solution phase along with the formation of tribochemical Cr oxide and Nb oxide phases, respectively, in the wear surfaces. This study provides guidelines for fabricating novel, low-friction, and wear-resistant HEAs for potential use at room and elevated temperatures, which will help reduce energy and material losses in friction and wear applications.
Date:
December 2016
Creator:
Kadhim, Dheyaa
System:
The UNT Digital Library
Legal Compliance in Guardianship Cases An Exploratory Study: Investigating Denton County Probate Court Visitors' Program Success with Legal Compliance in Guardianship Cases in 2013
Dabner, Carol P. Legal Compliance in Guardianship Cases. An Exploratory Study: Investigating Denton County Probate Court Visitors' Program Success with Legal Compliance in Guardianship Cases. Doctor of Philosophy (Applied Gerontology), December 2016, 140 pp., 18 tables, references, 20 titles. Aim: To evaluate the effectiveness of the legal compliance of the Denton County Probate Court Visitor's program in the year 2013. Rationale: Guardianship case management success is based on the presence of legal compliance of both guardians and the Court. When a guardian is legally compliant, a ward is receiving the statutorily minimum standards of care. Legal compliance equates (evidence of) the Ward receiving legally sufficient care. Research has not been vast; it has been consistent as to necessity of guardianship training, monitoring, and narrow focus of research. Evidence based research will assist in defining and developing appropriate court monitoring programs, which can add to the quality of care for elderly and disabled adults. Methods: 1,300 guardianship cases in the probate court. Of these cases, 910 had annual reports of the person filed, which 304 were reviewed using the Legal Compliance Audit. Eight (8) factors of compliance were reviewed with three (3) being Court actions and five (5) being guardian actions. …
Date:
December 2016
Creator:
Dabner, Carol Patrice
System:
The UNT Digital Library
The Role of Misfit Strain and Oxygen Content on Formation and Evolution of Omega Precipitate in Metastable Beta-titanium Alloys
β-Ti alloys are widely used in airframe and biomedical applications due to their high ductility, high hardenability, and low elastic modulus. The phase transformations in β-Ti alloys are rather complex due to formation of metastable phases during various thermo-mechanical treatments. One such critical metastable phase, the hexagonal omega (ω) phase, can form in β-Ti alloys under quenching from the high temperature β phase and/or isothermal aging at intermediate temperature. Despite a substantial amount of reported works on the ω phase, there are several critical issues related to the ω formation need to be resolved, e.g. role of alloying elements and oxygen content. Therefore, this dissertation has attempted to provide insights into ω transformation in low misfit (Ti-Mo) and high misfit (Ti-V) binary systems as well as multicomponent (Ti-Nb-Zr-Ta) alloys. The evolution of ω structure, morphology and composition from the early stage (β-solution+quenched) to later stages after prolonged aging are systematically investigated by coupling transmission electron microscopy (TEM), atom probe tomography (APT) and high-energy synchrotron X-ray diffraction techniques. The influence of aging temperature and duration on characteristic of ω phase in Ti-Mo, and Ti-V alloys is addressed in details. It is found that compositional changes during aging can alter the structure, …
Date:
December 2016
Creator:
Hendrickson, Mandana
System:
The UNT Digital Library