UNT Theses and Dissertations - 10,169 Matching Results

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Green Manufacturing of Lignocellulosic Fiber through Bacterial Degradation Process

Description: 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 … more
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Date: December 2023
Creator: Fu, Yu
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Saxophone Instruction by Women: Experiences of Achieving the Rank of Full Professor at Post-Secondary Institutions in the United States

Description: 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 … more
Date: December 2023
Creator: Heimann, Christa Marie
Item Type: Refine your search to only Thesis or Dissertation
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Factors Affecting MeHg Contamination of Spiders and Insect-Mediated MeHg Flux from Human-Made Ponds

Description: 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 … more
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Date: December 2023
Creator: Hannappel, Madeline Pratt
Item Type: Refine your search to only Thesis or Dissertation
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open access

Cross-Pollinating Culturally Sustaining Pedagogies and Systemic Functional Linguistics in English as a Second Language (ESL) Classrooms

Description: 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 g… more
Date: December 2023
Creator: Rana, Lal Bahadur
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Analyzing the Joint Effects of Network and Community Attributes on Network Performance: Evidence from Local Continuum of Care Homeless Service Networks

Description: 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 reg… more
Date: December 2023
Creator: Kim, Jintak
Item Type: Refine your search to only Thesis or Dissertation
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open access

The Impact of Kindergarten Classroom Assignment on Classroom Teachers and Student Achievement

Description: 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 … more
Date: December 2023
Creator: Fountain, Angelica Brianna
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Acenaphthene and 1,10-Phenanthroline-Fused Βeta-Functionalized Porphyrins

Description: 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
Item Type: Refine your search to only Thesis or Dissertation
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open access

Degradation Mechanisms and Dynamics of Silicon Telluride: A Guide to the Effective Fabrication and Characterization of Silicon Telluride-Based Devices

Description: 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 materia… more
Date: December 2023
Creator: Hathaway, Evan Allen
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Glucose-Induced Developmental Delay is Modulated by Insulin Signaling and Exacerbated in Subsequent Glucose-Fed Generations in Caenorhabditis elegans

Description: In this study, we have used genetic, cell biological and transcriptomic methods in the nematode C. elegans as a model to examine the impact of glucose supplementation during development. We show that a glucose-supplemented diet slows the rate of developmental progression (termed "glucose-induced developmental delay" or GIDD) and induces the mitochondrial unfolded protein response (UPRmt) in wild-type animals. Mutation in the insulin receptor daf-2 confers resistance to GIDD and UPRmt in a daf-1… more
Date: December 2023
Creator: Nahar, Saifun
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Synthesis, Characterization, Standardization, and Validation of Luminescence Optical Chemosensors for the Detection of Carbon Dioxide, Aluminum Ions, and Silver Ions for Real-Life Applications

Description: The presented dissertation encompasses three distinct investigations into novel complexes with diverse applications. Firstly, a Europium-based complex, K[Eu(hfa)4], exhibits remarkable potential for detecting dissolved CO2 in an ethylene glycol medium, offering a low limit of detection, rapid response times, and high signal-to-noise ratios. This complex demonstrates promise for quantifying CO2 concentrations and finds utility in sugar fermentation monitoring. Secondly, an innovative ratiometric… more
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Date: December 2023
Creator: Perera, Nawagamu Appuhamilage Kasun
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Saxophone Meets Chinese Culture: A Guide to Works for Saxophone by Composer Zou Xiangping

Description: Zou Xiangping is one of the most significant Chinese composers who writes music for the saxophone. These works, however, are not well-known in the classical saxophone repertoire. The purpose of this dissertation is to help international saxophonists develop an enlightened understanding and ultimately, performance of two selected pieces by Chinese composer Zou Xiangping (邹向平) (b. 1951), Images of Yalong River for Alto Saxophone and Piano (雅砻江印：为中音萨克斯管和钢琴) and Song of Chuanjiang River Boatman for… more
Date: December 2023
Creator: Zhang, Cehuai
Item Type: Refine your search to only Thesis or Dissertation
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Transport of Proton, Hydrogen and Alpha Particles through Atomic Hydrogen Environment

Description: Using multiple theoretical methods, comprehensive calculations are performed to create a new and more comprehensive data set for elastic scattering and related transport cross sections for collisions of (H$^+$ + H), (H + H) and (He$^{2+}$ + H) in the center-of-mass energy frame. In proton-atomic hydrogen collisions, we have significantly updated and extended previous work of elastic scattering, charge transfer and related transport integral and differential cross sections in the center-of-mass … more
This item is restricted from view until January 1, 2025.
Date: December 2023
Creator: Zaman, Tamanna
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Teacher Perceptions of Innovative Learning Environments: Implications for Leaders

Description: Innovative Learning Environments are increasingly built and implemented in schools, but are not necessarily being used according to designers' intentions. The goal of this study was to examine teacher perceptions of the innovative learning spaces they were charged with using and to determine if they were being used effectively and as designed. The research was guided by three basic questions: what were the teachers' perceptions of these spaces, was the teacher pedagogy need to change to acco… more
Date: December 2023
Creator: Elliott, Robyn Kaye
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Predictors of Academic Success in an Early College Entrance Program

Description: Early college entrance programs have existed in the United States since the 1950s, but in-depth research on academic success in these programs is lacking. Every year, early college entrance programs utilize a variety of data-gathering and candidate-screening techniques to select hundreds of students for admission into these accelerated programs. However, only a smattering of research articles has discussed the factors that predict academic success in these programs. This exploratory study inves… more
Date: December 2023
Creator: Earls, Samuel Wayne
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Development and Characterization of Compliant Bioelectronic Devices for Gastrointestinal Stimulation

Description: In this research, we aimed to develop thin-film devices on a polymer substrate and an alternative 3D-printed device with macroelectrodes for treating gastrointestinal (GI) conditions. First, the fabrication of thin-film devices was demonstrated on a softening thiol-ene/acrylate polymer utilizing titanium nitride (TiN) as electrode material. This was achieved by utilizing cleanroom fabrication processes such as photolithography, wet and dry etching. The functionality of the device was shown by p… more
This item is restricted from view until January 1, 2026.
Date: December 2023
Creator: Chitrakar, Chandani
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Directing Transition Metal Catalysis of Second and Third Row Metals through Ligand Design

Description: Ligand design is important due to a ligand's ability to tune properties of the transition metals, such as catalytic activity and selectivity. Gold(I) catalysts can be directly impacted by ligands electronically as well as with steric bulk when undergoing enantioselective and regioselective reactions. In the dissertation, a series of gold(I) acyclic diaminocarbenes were synthesized and used to explore the 1,6 enyne cyclization/hydroarylation. The use of metal templated synthesis of the gold(I) a… more
This item is restricted from view until January 1, 2025.
Date: December 2023
Creator: Nguyen, John
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Sonorous Andean Landscapes: A Performance Guide for Guevara Ochoa's "Yaraví, Danza y Huayno" (n.d) and Vivanco's "Fantasía Andina" (c. 1988)

Description: Peruvian composers Armando Guevara Ochoa (1926–2013) and César Vivanco (b. 1949) borrow and transplant musical elements from Andean folk tradition into their compositions for the modern classical flute. Guevara Ochoa's Yaraví, Danza y Huayno and Vivanco's Fantasía Andina are solo flute pieces rooted in Peruvian folklore traditions and Andean instrumental performance. The purpose of this dissertation is to provide flutists with technical and interpretative guidance in preparing these pieces. Yar… more
Date: December 2023
Creator: Romo Bocanegra, Jossecarlo
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Impact of Leadership on School Culture and Teacher Retention

Description: To determine the impact that school leaders have on school culture and teacher retention, a sequential explanatory mixed methods approach was used to study schools in a district feeder pattern in in a large, suburban district in Texas with a student population of approximately 25,000. In Phase 1, teachers at one elementary, one middle, and one high school were asked to complete a 26-question Likert scale survey about school culture. The last statement in the survey asked participants if they we… more
Date: December 2023
Creator: Spaulding, Shelly
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Kinetics and Thermochemistry of Halogen and Nitrogen Compounds

Description: Halogen and nitrogen containing compounds play a key role in the atmospheric chemistry of the Earth. Through a mixed computational and experimental approach, the kinetics of these compounds with radicals common to the atmosphere have been explored. Using fundamental measurements such as the IR absorption cross-section, the rate constants of atmospheric reactions and the properties of product molecules have been derived. These results have been further extended to environmental applications such… more
Date: December 2023
Creator: Rawling, George
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Partner: UNT Libraries

Surface Engineering of Materials for Beyond-Microelectronics

Description: All oxide heterostructure Cr2O3/TiO2-x was deposited on Al2O3(0001) single crystal via MBE. The analysis of interfacial interactions involving two metal oxides resulting in magnetic properties gave insights for using such heterostructures as potential spintronic device materials. The corundum phase epitaxial growth of TiO2-x on Al2O3 was characterized using XPS, AES, EELS, and LEED. The data obtained gives evidence of presence of two-dimensional electron gas at titania surface due to oxygen vac… more
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Date: December 2023
Creator: Anwar, Fatima
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

A Pedagogical Analysis of "Seven Chinese Folk Songs" by Wanghua Chu

Description: Wanghua Chu (b. 1941) is an outstanding Chinese composer and pianist, who has written extensively for piano. This dissertation offers a pedagogical analysis of Seven Chinese Folk Songs (1999), one of his most famous and well-regarded piano solo works. The present study has two broad and related aims: to introduce Wanghua Chu's Seven Chinese folk songs to a broader community of pianists outside of China; and to provide a pedagogical analysis so that pianists of a late-intermediate level and high… more
This item is restricted from view until January 1, 2025.
Date: December 2023
Creator: Chen, Zhaodong
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open access

A Comprehensive Investigation of Photoinduced Electron Transfer and Charge Transfer Mechanisms in Push-Pull Donor-Acceptor Systems: Implications for Energy Harvesting Applications

Description: Donor-acceptor systems exhibit distinctive attributes rendering them highly promising for the emulation of natural photosynthesis and the efficient capture of solar energy. This dissertation is primarily devoted to the investigation of these unique features within diverse donor-acceptor system typologies, encompassing categories such as closely covalently linked, push-pull, supramolecular, and multi-modular donor- acceptor conjugates. The research encompasses an examination of photosynthetic an… more
Date: December 2023
Creator: Alsaleh, Ajyal Zaki
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

The Effect of Developmental Hypoxia on Cardiac Physiology in Three Species: Alligator mississippiensis, Chelydra serpentina, and Danio rerio

Description: In this dissertation, I explored the effects of developmental hypoxia on heart contractility in three separate species of ectotherms: the common snapping turtle (Chelydra serpentina), the American alligator (Alligator mississippiensis), and the zebrafish (Danio rerio). I began with the common snapping turtle and tested whether the utilization of the sarcoplasmic reticulum was altered in response to developmental hypoxia. In the next two chapters, developmental hypoxia of the American alligator … more
This item is restricted from view until January 1, 2025.
Date: December 2023
Creator: Smith, Brandt Ragan
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Social Exchange Theory in the Context of X (Twitter) and Facebook Social Media Platforms with a Focus on Privacy Concerns among Saudi Students

Description: The current research examines the use of social media and its security settings using the Social Exchange Theory (SET) within a Saudi student environment. This research includes an introduction, literature review, methodology, results, and conclusion with the results section presenting the findings from the three essays. The first essay employs the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) methodology of SET. PRISMA's systematic and exhaustive approach to liter… more
This item is restricted from view until January 1, 2026.
Date: December 2023
Creator: Alqahtani, Sameer Mohammed S.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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