440 Matching Results

Results open in a new window/tab.

Nano-Manufacturing of Catalytic Amorphous Alloys

Access: Use of this item is restricted to the UNT Community
In this dissertation, nano-manufacturing of amorphous alloys for electro-catalytic applications is reported and the role of chemistry and active surface area on catalytic behavior is discussed. The catalytic activity of recently developed platinum and palladium-based metallic glasses was studied using cyclic voltammetry and localized electrochemical techniques. The synergistic effect between platinum and palladium was shown for amorphous alloys containing both these elements. The mechanism for superior catalytic behavior was investigated through electronic structure and surface chemical state of the alloys. A correlation between the work function and catalytic performance of the amorphous alloys with widely varying chemistries was established. To address the high cost associated with the noble-metal containing catalysts, the performance of non-noble Ni-P amorphous catalyst was evaluated for electro-catalysis. A facile pulsed electrodeposition approach was used for the nano-manufacturing of these amorphous catalysts. This nano-manufacturing route allowed the synthesis of fully amorphous nano-wires at room temperature for alloys with little or no noble-metal content. A wide range of nano-wires with varying aspect ratios from 25 to 120 was synthesized using commercially obtained anodic aluminum oxide (AAO) nano-molds. Cyclic voltammetry and chrono-amperometry demonstrated superior performance in terms of electrocatalytic activity and stability of the metallic glass nano-wires towards electro-oxidation …
Date: December 2019
Creator: Hasannaeimi, Vahid
System: The UNT Digital Library
Study of Homeless Emergency Discharge Coordination: Understanding Challenges and Success Factors to Collaboration Maturity (open access)

Study of Homeless Emergency Discharge Coordination: Understanding Challenges and Success Factors to Collaboration Maturity

Successful service coordination for the homeless depends on the ability of diverse organizations to effectively collaborate. This study utilizes a life-cycle framework to expand on the collaborative governance theory by highlighting the different stages of collaboration that homeless service networks encounter. Activation, collectivity, and institutionalization are three stages used to uncover the unique nature of emergency discharge planning processes. Since collaboration is not a static process and government regulation for emergency discharge plans were recently enacted in 2012, collaborative networks encounter challenges and success factors at different stages. A qualitative case-study approach of organizational leaders in homeless service networks in Texas (Dallas, Ft. Worth and Houston) examines stages of collaboration. Results show common success and challenge factors identified among the three networks, but the factors take on different forms in relation to where the networks are at in the coordination stages. Practitioners can use the findings from this study as a guide to set up benchmarks and measurable objectives to identify strengths and weaknesses in their coordination processes.
Date: December 2019
Creator: Washington, Federickia L
System: The UNT Digital Library
Meaning in Transition: An Ethnographic Study of the Cultural Construction of Health, Identity and Brands among Young Adults (open access)

Meaning in Transition: An Ethnographic Study of the Cultural Construction of Health, Identity and Brands among Young Adults

This study explored the lived experience of Gen Z adults in a liminal life-stage crisis where the symbolic meaning of health, identity and brands are in transition. Sixteen ethnographic in-home interviews with college students were conducted and analyzed using Geertz's interpretive and Turner's symbolic anthropology. A hermeneutic textual analysis was used to interpret three types of phenomenological data: text, pictures and collages. An "incubation" step was key in the creative interpretation process where the leap from data to abstract themes was made. Environmental circumstances like money, time, resources and social networks change the quality of health, but the fundamental health explanatory system of a young person is a reflection of their family of origin experiences. Women associate health with mental health-independence and empowerment. Men define health as physical health-food and cooking. Skills such as cooking and shopping as well as the consumption of water, cannabis and other complementary products impact health and identity. Three health worldview themes emerged: health as negotiating identity; creating home; and taking responsibility. Implications for branding and public information campaigns to change the health beliefs and practices of young adults are offered. This thesis closes with a reflection on the "research study," the dominant symbol in …
Date: December 2019
Creator: Taylor, Elizabeth Lee
System: The UNT Digital Library

Ensemble Singing in the Bel Canto Salon Repertory: A Pedagogical Reconsideration

Access: Use of this item is restricted to the UNT Community
Vocal duets have had a long history in the Western classical music tradition. Their use as a teaching resource can be traced back to the Renaissance, where duets were used for the development of singing, performance, and musicianship. In the late 19th and all of the 20th centuries, this pathway of vocal pedagogy has markedly declined. This study proposes a reintroduction of this methodology of teaching, asserting that it provides the collegiate vocal student with maximum opportunity for growth and development in terms of technique, musicianship, ensemble skills, and performance development. Four vocal duets ("La pesca," "Il brindisi," "Il gallop," and "La caccia") of Saverio Mercadante (1795-1870) serve as the point of discussion. These songs from Les soirées italiennes (C.1836), which are representative of the salon culture of the 19th century, are given detailed attention through a discussion of their pedagogical value. Since they are long out of print, a new performance edition is presented.
Date: December 2019
Creator: Brown, Shaun (Shaun Joseph)
System: The UNT Digital Library
Women's Access to School Superintendency Roles (open access)

Women's Access to School Superintendency Roles

Men continue to outnumber women in public school superintendent roles by a 4:1 ratio. However, women outnumber men by a 4:1 ratio in teaching roles in public school districts. In addition, more women than men hold superintendent certificates and educational doctorates. Due to this puzzling discrepancy, it is important to understand possible factors in the form of gendered barriers to access that could lead to the unequal representation of women in superintendent positions. In this study, I examined how these barriers manifested in the experiences of female superintendents participating in the study, how they influenced the hiring experiences of these participants, and how they impacted these female leaders throughout their careers. With this study, I investigated barriers associated with holding mechanisms, gendered norms, and gendered filters that may limit women's access to superintendent roles. Women's experiences of the origins and effects of gender normative perceptions and hiring practices have potential for contributing to the study of gender equity in the field of education and beyond. Findings could provide implications for increasing women's opportunities to serve beyond central office positions in public school districts. Possibilities exist for identifying practices in organizations that have hired women to serve at the highest level …
Date: December 2019
Creator: Solomon, Dana
System: The UNT Digital Library
Political Humility: Engaging Others with Different Political Perspectives (open access)

Political Humility: Engaging Others with Different Political Perspectives

The purpose of this study was to explore theorized predictors, intrapersonal effects, and interpersonal effects of political humility. Participants (N = 469) were adults recruited from Amazon's Mechanical Turk and undergraduate students who completed a series of measures online. First, I found that political humility is (a) positively associated with openness to experience, (b) negatively associated with political commitment, and (c) not significantly related to political diversity in one's social network. Second, regarding intrapersonal effects, I found that political humility was (a) positively associated with low emotional reactivity when presented with a different political perspective, (b) identifying positive aspects of the opposite political perspective, and (c) not significantly related to identifying negative aspects of one's own political perspective. Third, I found that both the self-reported political humility of the participant and the perceived political humility of the individual who hurt or offended the participant were positively associated with one's motivation to forgive the individual. Fourth, I found that the association between political humility and forgiveness was not significantly moderated by how close the participant felt to the offender before the hurt or offense. I conclude by discussing my findings in light of the present literature on humility.
Date: December 2019
Creator: Hodge, Adam S.
System: The UNT Digital Library
Microfluidic-Based Fabrication of Photonic Microlasers for Biomedical Applications (open access)

Microfluidic-Based Fabrication of Photonic Microlasers for Biomedical Applications

Optical microlasers have been used in different engineering fields and for sensing various applications. They have been used in biomedical fields in applications such as for detecting protein biomarkers for cancer and for measuring biomechanical properties. The goal of this work is to propose a microfluidic-based fabrication method for fabricating optical polymer based microlasers, which has advantages, over current methods, such us the fabrication time, the contained cost, and the reproducibility of the microlaser's size. The microfluidic setup consisted of microfluidic pumps and a flow focusing droplet generator chip made of polydimethylsiloxane (PDMS). Parameters such as the flow rate (Q) and the pressure (P) of both continuous and dispersed phases are taken into account for determining the microlaser's size and a MATLAB imaging tool is used to reduce the microlaser's diameter estimation. In addition, two applications are discussed: i) electric field measurements via resonator doped with Di-Anepps-4 voltage sensitive dye, and ii) strain measurements in a 3D printed bone-like structure to mimic biomedical implantable sensors.
Date: December 2019
Creator: Cavazos, Omar
System: The UNT Digital Library
Horn Concerto in E-flat Major (C41) by Antonio Rosetti: A Critical Edition (open access)

Horn Concerto in E-flat Major (C41) by Antonio Rosetti: A Critical Edition

This project delivers to the scholar and performer a critical edition of a little-known horn concerto by Antonio Rosetti. Standing in contrast to performance or practical editions, critical editions demand that the editor exerts a non-trivial measure of authority over the state of the text. Performers often find this fact to be uncomfortable given the normal tendency to revere the perceived intent of the composers based upon the text that they set down. When engaging with sources, it is rarely clear what that intent is, or which of the available sources most closely represents that intent. Those available sources often disagree with one another, even those in the composer's own hand. It is vital for the editor to know, as precisely as is possible, who created the source material, when they created these sources, and why they created these sources. At that point the editor must decide which sources will best fit his or her framework for the creation of the critical edition. At that point the editor will grapple with numerous inconsistencies and ambiguities within those sources, and then use his or her own authority to fix the text of the composer's work into a single version for today's …
Date: December 2019
Creator: Stewart, Brandon (Brandon Gregory)
System: The UNT Digital Library