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10,868 Matching Results
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Degradation Mechanisms and Dynamics of Silicon Telluride: A Guide to the Effective Fabrication and Characterization of Silicon Telluride-Based Devices
Silicon telluride (Si2Te3) and many other tellurium containing compounds show emergent Raman peaks located at ~120 cm-1 and ~140 cm-1 as they age. The origin of these two emergent peaks is controversial in the literature and has been attributed to myriad causes such as the intrinsic Raman modes of the telluride materials, surface oxidation, defects, double resonances, and tellurium precipitates. The controversial nature of these peaks has led to the misidentification of highly degraded materials as pristine and to the misinterpretation of changes in Raman spectra. For the first time, quality thin film and bulk crystals of Si2Te3 are grown using a chemical vapor deposition (CVD) process. We then present a comprehensive and multimodal study of various Si2Te3 samples and find that the two emergent Raman peaks originate from tellurium nano-crystallites formed in the degraded surface layers of Si2Te3. The formation of the tellurium nano-crystallites are shown to be a result of a hydrolysis process in which Si2Te3 reacts with atmospheric water vapor. The challenges involved in the fabrication of Si2Te3 based devices are also discussed and ways in which degradation can be either prevented or reversed are demonstrated. Finally, we present preliminary data which shows promising low voltage switching …
Date:
December 2023
Creator:
Hathaway, Evan Allen
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Acenaphthene and 1,10-Phenanthroline-Fused Βeta-Functionalized Porphyrins
A series of acene-fused porphyrins and 1,10-phenanthroline-fused porphyrins were synthesized and characterized via NMR spectroscopy and mass spectrometry. The acene-fused porphyrins exhibit unique optoelectronic properties, most notably they exhibit highly red-shifted absorption bands. The 1,10-phenanthroline-fused porphyrins are of interest for their ability to bond to as variety of metals to form chelation complexes.
Date:
December 2023
Creator:
Arvidson, Jacob Randall
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Impact of Kindergarten Classroom Assignment on Classroom Teachers and Student Achievement
To determine the impact of an administrator's decision on student placement in kindergarten classrooms, teachers were asked to share their perceptions on how that decision impacted their ability to deliver instruction and follow the district scope and sequence, as well as how that decision impacts student academic achievement and social and emotional development. This qualitative study was designed to gather data from kindergarten teachers using focus group interviews and individual interviews of campus principals from two campuses within the same district. The following two ways in which kindergarten classrooms were created were explored: (a) by random assignment or (b) knowledge of students' academic and behavioral performance based on information relevant to their Pre-K experience. Campus principal participants reported that they each chose their method to provide equity in the classrooms and fairness amongst their teachers. Teacher participants reported that overall, they preferred to have as much information about incoming students as possible and to be a part of the process of placing students into classrooms for the following year. By examining these teachers' perspectives, the findings from this study may positively influence policy and practice for campus administrators as they decide how they will place students in kindergarten classrooms. Continued …
Date:
December 2023
Creator:
Fountain, Angelica Brianna
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analyzing the Joint Effects of Network and Community Attributes on Network Performance: Evidence from Local Continuum of Care Homeless Service Networks
This dissertation examines the factors and combinations of factors that affect the performance of continuum of care homeless service networks, applying the configurational approach of contingency theory to data sets drawn from federal sources. The study accepts the two key assumptions from the theory: (1) that there are multiple paths to high performance and (2) key conditions have a joint influence on network performance. The data analysis in this study has two parts. The first employs OLS regression to examine the causal relationship between independent variables and the performance of permanent supportive housing (PSH) programs. This study also applies fuzzy set qualitative comparative analysis (fsQCA) to identify multiple combinations of factors that influence the performance of PSH programs. The results identify key factors and multiple combinations of factors that lead to high and low network performance. Federal CoC funding emerges as a core condition for high and low performance, but all relevant conditions can be critical factors depending on how they interact with other relevant conditions. This analysis helps expand the utility of existing contingency theory by using it to explain the dynamic interactions between factors in the context of public service networks. Ultimately, this dissertation confirms that fsQCA can …
Date:
December 2023
Creator:
Kim, Jintak
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Cross-Pollinating Culturally Sustaining Pedagogies and Systemic Functional Linguistics in English as a Second Language (ESL) Classrooms
This exploratory case study research was conducted with a view to exploring how teachers teaching emergent bilingual students in ESL programs can enact the principles of culturally sustaining systematic functional linguistics (CS SFL), such as critical centering, historicizing, curricularizing, teaching and learning cycle (TLC), and semantic waving in their classrooms. Two middle school teachers participated in the study and used CS SFL principles to teach their emergent bilingual students. I gathered data for the study through non-participatory observations, semi-structured interviews, informal talks with the teachers, usually right after their classes, and artifacts from teachers and students. The thematic analysis of the data demonstrated that teachers could recognize their students' ways of knowing and being by (a) translanguaging between English and Spanish seamlessly in their classrooms; (b) centering their students' lifeways, prior knowledge, and lived experiences by making them the parts of their curricula; (c) using TLC for creating dialogic interactions between teachers and students and among students; (d) positioning their students through strength perspectives; and (e) using multimodal and multi-semiotic means of communication so that their students can understand their content area knowledge and express their ideas even if their English language is emerging. The teachers faced tensions about whether …
Date:
December 2023
Creator:
Rana, Lal Bahadur
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Factors Affecting MeHg Contamination of Spiders and Insect-Mediated MeHg Flux from Human-Made Ponds
The present study focused on methylmercury (MeHg) in emergent aquatic insects and spiders from human-made ponds. This dissertation addresses two main topics: (1) factors affecting variation in spider MeHg concentrations around human-made ponds and (2) the magnitude of MeHg transported out of human-made ponds by emergent aquatic insects (insect-mediated MeHg flux). Spiders were specifically targeted in this study because they have been proposed as sentinels of MeHg contamination (organism whose tissue concentrations reflect the level of MeHg in the environment). Spider MeHg concentrations were related to spider diet, size, and proximity to waterbody, but affected individual spider taxa differently. In a second study, I found that only "large" spiders within a taxa had tissue concentrations positively related to prey MeHg concentrations. These results indicate that the relationship between spider and prey MeHg could be size-dependent and that "large" spiders within a taxa may better reflect ambient MeHg contamination. Finally, I tested a conceptual model hypothesizing insect-mediated MeHg flux from human-made ponds is controlled by pond permanence and fish presence. In agreement with the conceptual model, insect-mediated MeHg flux from ponds was suppressed by the presence of fish, likely due to fish predation on emergent insect larvae. I found the mean …
Date:
December 2023
Creator:
Hannappel, Madeline Pratt
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Saxophone Instruction by Women: Experiences of Achieving the Rank of Full Professor at Post-Secondary Institutions in the United States
Since the first saxophone professor at the Paris Conservatory in 1858, saxophone instruction has primarily been a male-dominated field. Numerous sources detail the experiences, lives, and influence of male post-secondary saxophone instructors. Women have made great strides in the performance and instruction of the saxophone at the post-secondary level, but sources discussing their lives and experiences are limited. Saxophone instruction at the post-secondary level in the United States began in the late 1800s. As the instrument grew in popularity through the 20th century, more and more higher education institutions began incorporating the saxophone as an instrument for primary study. This increased the need for saxophone professors in the United States. In 1994, Elizabeth Zinn Ervin, became the first woman full professor. This was 40 years after the the first man, Larry Teal, held this rank. As of 2023, 15 women have achieved the rank of full professor. This document is intended to highlight several women saxophone instructors throughout the history of the instrument, and detail the thoughts and experiences of women saxophonists who have achieved the rank of full professor in the United States.
Date:
December 2023
Creator:
Heimann, Christa Marie
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Green Manufacturing of Lignocellulosic Fiber through Bacterial Degradation Process
Lignocellulose is the most abundant biopolymer on earth and offers excellent potential for sustainable manufacturing. Because lignocellulose is structurally complex and resistant to decomposition, innovative degradation strategies are necessary to unlock its value. In this dissertation, a green manufacturing process through enzyme-triggered self-cultured bacteria retting for lignocellulosic fiber was developed and investigated. The mechanism of the lignocellulosic fiber retting at a controlled degradation strategy was studied. This enzymatic degradation strategy utilizes a small amount of enzyme to trigger a large aggregation of specific bacteria to obtain clean fibers. Industrial hemp (Cannabis sativa L.) fiber was successfully retted with this strategy. The degradation of pectin was proved through an environmental scanning electron microscope and reducing sugar analysis. The bacterial successions were identified by 16S rRNA gene metagenomic sequencing. The results showed that Bacillaceae dominated the hemp retting conditions containing 1% pectinase, suggesting that pectinase can manipulate bacterial community succession by changing the nutrients available to bacteria through the degradation of pectin. This degradation strategy has 20-25% less environmental impact than the thermochemical degradation strategy, resulting in better fiber consistency and much shorter processing time (3-5 days) than the traditional water degradation strategy. The study on the degradation of lignin-rich lignocellulose also …
Date:
December 2023
Creator:
Fu, Yu
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Effect of Restructuring of Peer Firms on Investment
Firms' operational restructuring involves information relevant to strategic choices as well as future demand and cost conditions. This study examines the relationship between peer firms' restructuring and a company's responsiveness to its growth opportunities. Peer firm restructuring can increase uncertainty with respect to a company's payoffs regarding its investment projects, leading to decreased responsiveness to growth opportunities. Using a large sample of public companies during 2006–2020, I find that peer firms' restructuring is negatively associated with the responsiveness of capital expenditures (Capex) to growth opportunities. The results suggest that peer firms' restructuring activities provide information about a company's investment projects above and beyond industry shocks reflected in changes in industry sales. Furthermore, these associations are moderated by industry competition. The negative effects of peer firms' restructuring on Capex sensitivity are the strongest in high-competition industries.
Date:
December 2023
Creator:
Kim, Hojoong
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Investigating Novel Streptomyces Bacteriophage Endolysins as Potential Antimicrobial Agents
As antibiotic resistance has become a major global threat, the World Health Organization has urgently called scientists for alternative strategies for control of bacterial infections. Endolysin, a protein encoded by a phage gene, can degrade bacterial peptidoglycan (PG). Currently, there are three endolysin products in the clinical phase. We, thus, are interested in exploring novel endolysins from Streptomyces phages as only a few of them have been experimentally characterized. Using bioinformatics tools, we identified nine functional domain groups from 250 Streptomyces phages putative endolysins. NootNoot gp34 (transglycosylase; Nt34lys), Nabi gp26 (amidase; Nb26lys), Tribute gp42 (PGRP; Tb42lys), and LazerLemon gp35 (CHAP; LL35lys) were selected for experimental studies. We hypothesized that (1) the proteins of interest will have the ability to degrade PG, and (2) the proteins will be potential antimicrobial agents against ESKAPE safe relatives. The results showed that LL35lys, Nb26lys and Tb42lys exhibit PG-degrading activity on zymography and hydrolysis assay. The enzymes (400 µg/mL) can reduce PG turbidity to 32-40%. The killing assay suggested that Tb42lys possess a boarder range (Escherichia coli, Pseudomonas putida, Acinetobacter baylyi and Klebsiella aerogenes). While Nb26lys can attack Gram-negative bacteria, LL35lys can only reduce the growth of the Gram-positive strains with an MIC90 of 2 …
Date:
December 2023
Creator:
Maneekul, Jindanuch
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Rethinking the Study of Conflict and Peace: Making Causal Inferences in Quantitative Conflict and Peace Research
Most research questions and theory in quantitative peace and conflict research are fundamentally causal. However, a large gap exists in the extant literature between research question and research methodology. Not only does most existing methodology fail to achieve what most quantitative peace scholars attempt, but many researchers do not appear to be aware of these limitations. In this dissertation, I outline five key shortcomings within this literature that, left unaddressed, create results that are not informative of the questions quantitative peace researchers are interested in. This dissertation demonstrates solutions addressing these shortcomings with two applied chapters, conducting causal research designs on a study examining the economic impact of United Nations peacekeeping operations and the effect of human rights treaties on repression, respectively. I find that conventionally-established results in the literature change dramatically when exposed to methodological changes informed by the causal inference literature.
Date:
December 2023
Creator:
Lookabaugh Jr., Brian Scott
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exploring the Association of Language Brokering and Parent-Child Relationship in Korean Immigrant Families
This study focuses on investigating the dynamics of language brokering as Korean immigrant families experience environmental challenges associated with immigration. This study was conducted with qualitative research design with purposive sampling of Korean immigrant families. Six parent-child dyads were recruited and participating children were between 12 to 16 years old. Semi-structured interviews were conducted separately with parents and children in either English or Korean. Thematic analysis was employed for analyzing the transcribed interviews. The Dedoose software program was applied to assist the coding process. 12 subthemes were revealed under four main themes, which were aligned to the study's research questions. The twelve subthemes included parents' dependence on children, vulnerability and resilience of Korean immigrant families, children's socioemotional development through language brokering, and the role of first-born daughter in the family. Parent and child responses indicated how language brokering affects can be a risk in relation to children's development (i.e., with responsibility of language brokering leading the child to experience stress or experience the responsibility of translation as a burden. Positively, respondents indicated that the parent and child experienced a greater sense of empathy for each other's roles. The results derived from this study were aligned with the results of previous …
Date:
December 2023
Creator:
Lee, Eunkyung
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Option Pricing Under New Classes of Jump-Diffusion Processes
In this dissertation, we introduce novel exponential jump-diffusion models for pricing options. Firstly, the normal convolution gamma mixture jump-diffusion model is presented. This model generalizes Merton's jump-diffusion and Kou's double exponential jump-diffusion. We show that the normal convolution gamma mixture jump-diffusion model captures some economically important features of the asset price, and that it exhibits heavier tails than both Merton jump-diffusion and double exponential jump-diffusion models. Secondly, the normal convolution double gamma jump-diffusion model for pricing options is presented. We show that under certain configurations of both the normal convolution gamma mixture and the normal convolution double gamma jump-diffusion models, the latter exhibits a heavier left or right tail than the former. For both models, the maximum likelihood procedure for estimating the model parameters under the physical measure is fairly straightforward; moreover, the likelihood function is given in closed form thereby eliminating the need to embed a probability density function recovery procedure such as the fast Fourier transform or the Fourier-cosine expansion methods in the parameter estimation procedure. In addition, both models can reproduce the implied volatility surface observed in the options data and provide a good fit to the market-quoted European option prices.
Date:
December 2023
Creator:
Adiele, Ugochukwu Oliver
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Thermodynamics, Kinetics and Mechanical Behavior of Model Metallic Glasses
The thermophysical properties and deformation behavior of a systematic series of model metallic glasses was investigated. For Zr-based metallic glasses with all metallic constituents, the activation energy of glass transition was determined to be in the range of 74-173 kJ/mol while the activation energy of crystallization was in the range of 155-170 kJ/mol. The reduced glass transition temperature was roughly the same for all the alloys (~ 0.6) while the supercooled liquid region was in the range of 100-150 K, indicating varying degree of thermal stability. In contrast, the metal-metalloid systems (such as Ni-Pd-P-B) showed relatively higher activation energy of crystallization from short range ordering in the form of triagonal prism clusters with strongly bonded metal-metalloid atomic pairs. Deformation mechanisms of all the alloys were investigated by uniaxial compression tests, strain rate sensitivity (SRS) measurements, and detailed characterization of the fracture surface morphology. For the metal-metal systems, plasticity was found to be directly correlated with shear transformation zone (STZ) size, with systems of larger STZ size showing better plasticity. In metal-metalloid amorphous alloys, plasticity was limited by the distribution of STZ units, with lower activation energy leading to more STZ units and better plasticity. The alloys with relatively higher plasticity …
Date:
December 2023
Creator:
Akhtar, Mst Alpona
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
"To Swim In Air Forever Tooloud Laughcrying"
This thesis' focal presentable object – to swim in air – is a mythosystem comprising six iteratively malleable experiential systems of intermedial musical and visual performance works composed by myself between the years 2018 and 2023. Conceived through the lens of Jennifer Walshe's New Discipline, created within my practice cycle's nodal context, and connected by a sub/conscious structure of perceptual timbre, the mythosystem and its parts form the centerpiece of this discussion of context, process, and method. As described in this document, the creative practice of nodal context and the adaptive intermedial methods used in the conceptualization and composition of to swim in air were developed through a personal and pragmatic application of feminist writer and independent scholar Sarah Ahmed's Queer Phenomenology: Orientations, Objects, Others, and composer, musicologist and trombonist George Lewis' curatorial decolonization guidelines as outlined in his "8 Difficult Steps to Decolonizing Music" towards the creation of presentable cultural objects which invite variable and continuous interaction from their participants through the exploration of the reciprocity of community, multi-practice creative strategy and malleable forms. Throughout this document I discuss how through the exploration of the reciprocity of community, multi-practice creative strategy and malleable forms I have addressed concerns of …
Date:
December 2023
Creator:
Fristensky, Louise Anne
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Idiomatic Techniques and Procedures of Composer Kevin Walczyk (b. 1964) that Define a Unique Musical Language
Award winning composer Kevin Walczyk's describes himself as a "musical storyteller," using all musical elements of structure, melody, harmony, and counterpoint to convey programmatic content. A variety of subjects are conveyed that include historical events, people, physical objects or locations, and literary texts. Deeper matters, such as spiritual themes, are also often incorporated in his music that enhance the musical program. The technical procedures employed—pertaining particularly to the expression of programmatic content—has produced a unique musical language that stands out in the modern compositional landscape. What are these inherent idiomatic features, and how are they exhibited? The purpose of this dissertation is to provide a detailed examination of Walczyk's distinct musical language. A critical analysis of the technical procedures used to convey his programmatic content, as well as insights into his influences and writing process, illuminate the attributes of this a posteriori musical language. The two works selected for this study to demonstrate this are Symphony No. 2: Epitaphs Unwritten and Talking Winds, both written for wind band.
Date:
December 2023
Creator:
Wollam, Seth Frederick
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exploring the ROI of 1:1 Computing Programs at the High School Level
This dissertation explored the cost and value of 1:1 computing programs in high schools in Texas. The study examines whether the total cost of ownership of these programs can be justified by the student testing gains and graduation rates. It investigates whether student learning outcomes show a definable correlation between positive gains and the implementation of 1:1 computing programs. The study also explores whether there is a measurable return on investment of 1:1 programs based on testing gains and graduation rates. The research used the State of Texas Assessment of Academic Readiness exam scores to validate assumptions and test the hypothesis. The study found no clear link between the addition of 1:1 computing programs and the realms of student success. While there is marginal improvement in student outcomes, there is only circumstantial evidence that laptops and devices are the catalysts for the change. The dissertation also found that the total cost of ownership (TCO) is a significant portion of the district's spending, costing millions of dollars, and that the financial disclosure and budget information data was either missing, incomplete, or over-generalized, causing an issue for assessing program effectiveness or ROI. Despite this lack of transparency, there is a slight positive …
Date:
December 2023
Creator:
Kissel, Tara Michelle
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Utility Trombone Playing: A Practical Method for Students to Achieve Mastery of Alto, Tenor and Bass Trombone
With the importance of versatility in freelance work in the world of trombone performance, along with increased competition for that work, the need for players to play alto, tenor, and bass trombones to a high level of proficiency has become more and more crucial. This, coupled with the growing number of orchestras looking to hire musicians who are highly competent on all three instruments means that university professors need to be able to teach all three instruments. This evolution of the job market is driving a need for pedagogical material that is specifically designed to address the unique challenges of practicing and performing at a professional level on the main three instruments in the trombone family. As of the time of writing, this material simply does not exist. This project aims to fill that instructional gap. It gives students and teachers a resource that outlines an approach for a four-year undergraduate course of study that allows for the development of the playing of each of the trombones individually and collectively, utilizing the strengths of one instrument to develop the other two. It will also allow for the exploration of the technical challenges that arise when playing and changing between instruments. …
Date:
December 2023
Creator:
Owner, Timothy Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Doctoral Recital: 2018-02-06 – Jung-An Chou, soprano
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
February 6, 2018
Creator:
Chou, Jung-An
Object Type:
Sound
System:
The UNT Digital Library
Doctoral Recital: 2018-02-10 – Brandi Estwick, mezzo-soprano
Recital presented at the UNT College of Music Voertman Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
February 10, 2018
Creator:
Estwick, Brandi
Object Type:
Sound
System:
The UNT Digital Library