Partner
UNT Libraries
184
UNT Libraries Government Documents Department
94
UNT Libraries Special Collections
63
UNT College of Science
56
Oklahoma Historical Society
37
Sterling Municipal Library
26
UNT College of Engineering
26
Cooke County Library
22
UNT College of Information
18
Schulenburg Public Library
14
23 More
Collection
Degree Department
Degree Discipline
Degree Level
States
Decade
Month
Language
657 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
657
next
Design of high SERS sensitive substrates based on branched Ti nanorods
Article reports a rational design of branched titanium (Ti) nanorods formed by glancing angle physical vapor deposition and their applications as substrates for surface-enhanced Raman scattering (SERS). The authors investigation provides a mechanism to fabricate sensitive SERS sensors of Ti nanorods that are known to be thermally and chemically stable and compatible with silicon-based electronics.
Date:
July 8, 2022
Creator:
Abayomi M. Yussuf, Nosirudeen; Li, Jianlin; Jung, Yung Joon & Huang, Hanchen
Object Type:
Article
System:
The UNT Digital Library
Queering Afrofuturism: Freedom Dreaming and Co-Constructing Black Queer Spaces in Teacher Preparation Programs
Using queer and Afrofuturist frameworks, this Black feminist qualitative study explored queer Black pre-and in-service teachers' cultural and intersectional practices as they navigated traditional heteronormative educational spaces. This research study relied on counternarratives and storytelling and drew from Afrofuturism to understand the use of their lived experiences to counter monolithic queer narratives. The queer Black teachers in this study examined and negotiated how their Blackness and queerness showed up in teacher preparation programs (TPP) and K-12 classrooms. Moreover, they eventually refused to hide or censure their authentic selves. An analysis of the narratives and counternarratives showed that queer Black teachers drew from ancestral traditions to create queer Afrofuturist spaces in TPPs and educational places. Furthermore, due to their queer Black intersectional approaches, their classrooms, assignments, curriculum, and pedagogy disrupted normative teaching practices. Implications, recommendations, and future research are discussed.
Date:
July 2023
Creator:
Adeniji, Danelle Althea
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Structural Design and Its Impact on Thermal Efficiency and Corrosion of All-Aluminum Microchannel Heat Exchangers
In this study, high-fidelity conjugate heat transfer simulations are used to model a micro-channel heat exchanger (MCHE) in a crossflow to study its thermal-hydraulic performance. This study considers three different microchannels (internal flow) geometries (circular, triangular, and square) with louver-shaped fins. The local flow field showed a strong coupling between the microchannel flow, solid domain, and crossflow. The flow separation and wake regions formed near MCHE resulted in a large variation in the velocity field and temperature in the crossflow. The wake region had a significant spanwise variation due to its interaction with fins, which also causes variations in the thermal boundary layer. The heat conduction in the solid structure provided a non-uniform temperature field with a higher temperature near the microchannel and a slightly lower temperature near the surface exposed to the crossflow. The microchannel flow analysis showed that the internal geometry affects the pressure drop, which is highest for the triangular MCHE and lowest for the circular MCHE. However, the microchannel flow temperature change was relatively similar for all microchannels. Results showed that for the same volume of the microchannel, the circular shape microchannel has a higher performance index value than the triangular and square shapes. This study …
Date:
July 2023
Creator:
Ahmed, Hossain
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
High-Fidelity Conjugate Heat Transfer Simulation of Micro-Channel Heat Exchanger
Article describes how high-fidelity conjugate heat transfer simulations are used to model a micro-channel heat exchanger (MCHE) in a crossflow to study its thermal-hydraulic performance. Three different microchannel geometries, namely circular, triangular, and square with louver-shaped fins, are considered.
Date:
July 1, 2023
Creator:
Ahmed, Hossain; Sadat, Hamid & Nasrazadani, Seifollah
Object Type:
Article
System:
The UNT Digital Library
Tribocatalytically-Active Coatings for Enhanced Tribological Performance and Carbon-Based Tribofilm Formation
In this study, we investigate the fundamental mechanisms defining the approach for addressing tribological challenges in mechanical systems via the use of the tribocatalytically active coating. The coating is designed using an electrodeposition process and consists of a hard amorphous cobalt-phosphorous matrix with the incorporation of tribocatalytically-active nickel and copper. Our focus is on understanding the effect of the tribocatalytic elements, Cu vs Ni, on the coating's performance in high-contact stress conditions, generating local heating, shear, and compression. By optimizing the relative composition and mechanical characteristics of the coating, we aim to enhance its tribological performance in the presence of a hydrocarbon environment. Through extensive characterization of the wear tracks using SEM/EDS and Raman analyses, we identify the formation of a protective carbon-based tribofilm on the coating's surface during sliding as the key factor behind its excellent performance. Our findings not only contribute to the understanding of material transformations in the contact but also offer a robust and versatile approach to addressing tribological challenges in mechanical systems. The development of this innovative coating opens up new possibilities for promoting the formation of protective tribofilms and improving the performance of mechanical components operating in low-viscosity fuels and synthetic oils.
Date:
July 2023
Creator:
Al Sulaimi, Rawan
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Role of Social Media Influencers in Saudis' Domestic Destination Choice
This study aims to find out the impact of the credibility and content quality of social media influencers on the various stages of the customer's journey and the intention to choose a destination for the Saudi tourist. The target segment was Saudis in general, who are 18 years or above. To conduct this study, 618 usable questionnaires were collected. This study tested twenty-two hypotheses. The result of this study showed that the relationship between content quality, expertise, and similarity was significantly positive with the tourist's desire and information searching. As well, the relationship between the tourist's desire and information searching was significantly positive with the intention of choosing a destination. Conservatism, engagement, and gender were tested as moderators. Conservatism was not significant while the engagement was significant. Gender was only significant in the relationship between content quality and the tourist's desire. This study contributes to information and knowledge in the fields of tourism, hospitality, travel, marketing, tourist behavior, information science, and social media. Researchers and those interested in tourist and customer behavior can benefit from the results of this study. In the industrial field, this study will be very useful to the Saudi government, which has recently begun to rely …
Date:
July 2023
Creator:
Alamer, Mohammed Abdullah I
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Investigation of Existing and New Human Resource Practices on Public Health Employee Retention during the COVID-19 Pandemic in Saudi Arabia
This research investigates existing and new HR practices that have impacted public health employee retention in Saudi Arabia during the COVID-19 pandemic. It builds on social support theory and social exchange theory to better understand the relationships between HR practices and retention, and uses quantitative methods to examine the hypotheses based on a conceptual framework. While OLS regression is employed to analyze the relationships between HR practices and retention, path analysis (bootstrapping) is used to examine the mediator variable. Based on 417 valid questionnaires distributed to public health employees in Saudi Arabia's central, western, and eastern regions, the analysis illustrates that while training and emphasis on work-life-balance as existing HR practices had a positive effect on retention, social support (supervisory support) and promotion of mental well-being as new HR practices also had a positive effect on retention during the COVID-19 pandemic. However, the hypothesis that compensation and occupational health and safety would improve retention was not supported. These results indicate that financial benefits and providing safety materials did not lead to employee retention. Meanwhile, safety training programs, psychosocial support, and promotion of well-being have been essential HR practices during the pandemic. Regarding the mediation hypotheses, interestingly, the results show that …
Date:
July 2023
Creator:
Alattas, Mohsen Mohammad A
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Scalable Next Generation Blockchains for Large Scale Complex Cyber-Physical Systems and Their Embedded Systems in Smart Cities
The original FlexiChain and its descendants are a revolutionary distributed ledger technology (DLT) for cyber-physical systems (CPS) and their embedded systems (ES). FlexiChain, a DLT implementation, uses cryptography, distributed ledgers, peer-to-peer communications, scalable networks, and consensus. FlexiChain facilitates data structure agreements. This thesis offers a Block Directed Acyclic Graph (BDAG) architecture to link blocks to their forerunners to speed up validation. These data blocks are securely linked. This dissertation introduces Proof of Rapid Authentication, a novel consensus algorithm. This innovative method uses a distributed file to safely store a unique identifier (UID) based on node attributes to verify two blocks faster. This study also addresses CPS hardware security. A system of interconnected, user-unique identifiers allows each block's history to be monitored. This maintains each transaction and the validators who checked the block to ensure trustworthiness and honesty. We constructed a digital version that stays in sync with the distributed ledger as all nodes are linked by a NodeChain. The ledger is distributed without compromising node autonomy. Moreover, FlexiChain Layer 0 distributed ledger is also introduced and can connect and validate Layer 1 blockchains. This project produced a DAG-based blockchain integration platform with hardware security. The results illustrate a practical technique …
Date:
July 2023
Creator:
Alkhodair, Ahmad Jamal M
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
[Katy Allred after voting]
Selfie of Katy Allred wearing a cloth face mask and holding an "I voted" sticker with a blue finger glove.
Date:
July 9, 2020
Creator:
Allred, Katy
Object Type:
Photograph
System:
The UNT Digital Library
["Squirrel Distancing" sign at University of Houston]
Photograph of a small yard sign on the University of Houston campus reading "Squirrel Distancing" and indicating a short distance.
Date:
July 10, 2020
Creator:
Allred, Katy
Object Type:
Photograph
System:
The UNT Digital Library
Information Privacy and Security Associated with Healthcare Technology Use
This dissertation consists of three studies that investigate the information privacy & security associated with healthcare technology use. Essay 1 PRISMA-style systematically reviews the existing literature on privacy information disclosure in IoT technology and serves as the theoretical foundation of the current research. It is crucial to comprehend why, how, and under what consequences individuals choose to disclose their personal and health information since doing so is beneficial to the company. This SLR method allows us to find those factors that significantly impact individuals' behavioral intention to disclose personal information while using IoT technologies. Essay 2 posits, develops, and tests a comprehensive theoretical framework built upon the theory of planned behavior and the health belief model to examine factors affecting willingness to disclose PHI in order to use WFDs. A research survey is designed and distributed to a crowdsourcing platform, Mechanical Turk (M-Turk). Research hypotheses are tested using partial least square – structural equation modeling (PLS-SEM). To achieve this purpose, Essay 3 extends the findings from the previous essay and further investigates the caregiver context. Therefore, we developed a novel theoretical model utilizing privacy calculus theory and the technology acceptance model to investigate the willingness of the elderly to disclose …
Date:
July 2023
Creator:
Amin, M A Shariful
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Plasmon-resonance emission tailoring of “origami” graphene-covered photonic gratings
Article focusing on the modification of optical properties through folding, or “origami,” of graphene covering a plasmonic metal channel grating. This work is especially critical to understanding tailored deep plasmon emission from geometrically-modulated conducting sheets such as graphene.
Date:
July 16, 2020
Creator:
Araki, Ken & Zhang, Richard Z.
Object Type:
Article
System:
The UNT Digital Library
Multitask deep-learning-based design of chiral plasmonic metamaterials
This article presents an end-to-end functional bidirectional deep-learning (DL) model for three-dimensional chiral metamaterial design and optimization. This ML model utilizes multitask joint learning features to recognize, generalize, and explore in detail the nontrivial relationship between the metamaterials’ geometry and their chiroptical response, eliminating the need for auxiliary networks or equivalent approaches to stabilize the physically relevant output. This model efficiently realizes both forward and inverse retrieval tasks with great precision, offering a promising tool for iterative computational design tasks in complex physical systems. Other potential applications include photodetectors, polarization-resolved imaging, and circular dichroism (CD) spectroscopy.
Date:
July 1, 2020
Creator:
Ashalley, Eric; Acheampong, Kingsley; Besteiro, Lucas V.; Yu, Peng; Neogi, Arup; Govorov, Alexander O. et al.
Object Type:
Article
System:
The UNT Digital Library
Design and Synthesis of Gold (I) Acyclic Diamino Carbene Complexes as Metallodrugs for Cancer and for Asymmetric Catalysis
Many previous studies have demonstrated that gold compounds possess successful results in catalysis and in medicinal chemistry. The central aim of this dissertation is the design and synthesis of novel gold (I) acyclic diamino carbene complexes as a chemotherapeutic agent for triple-negative breast cancer (TNBC) and for catalysis. In this study, a series of chiral neutral and cationic gold (I) acyclic diamino carbene (ADC) complexes and neutral gold (I) bis- ADC complexes have been synthesized. As the chiral neutral gold (I) ADCs, four diastereomers of S binaphthyl L proline tertiary butyl ester gold (I) chloride, S binaphthyl D proline tertiary butyl ester gold (I) chloride, R binaphthyl L proline tertiary butyl ester gold (I) chloride, and R binaphthyl D proline tertiary butyl ester gold (I) chloride have been synthesized and characterized. Different chiral gold (I) ADC complexes with bulky chiral binaphthyl group and with different amine groups of morpholine, chiral proline methyl ester, and benzyl ester have been synthesized and characterized. After that four diastereomers of the nitrile adduct of cationic binaphthyl proline tertiary butyl ester nitrile and four diastereomers of the isonitrile versions of it have been synthesized and characterized. A series of gold (I) cationic bis ADC complexes …
Date:
July 2023
Creator:
Asuramana Pedi Durayalage, Roshani
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Hypoxia-Induced Cardiac Arrest Alters Central Nervous System Concentrations of the GLYT2 Glycine Transporter in Zebrafish (Danio rerio)
Hypoxia as a stressor has physiological implications that have been a focal point for many physiological studies in recent years. In some studies, hypoxia had large effects on the organ tissue degeneration, which ultimately effects multiple ecological processes. These organ tissue studies played a part in the development of new fields like neurocardiology, a specialty that studied the relationship between the brain and the heart. This thesis focuses on how hypoxia-induced cardiac arrest alters the amounts of GLYT2, a glycine reuptake transporter, in the central nervous system of zebrafish, Danio rerio. At 7 days post-fertilization (dpf), zebrafish were exposed to acute, severe hypoxia until they lost equilibrium, and minutes later, subsequent cardiac arrest occurred. Zebrafish were then placed into recovery groups to measure the GLYT2 levels at multiple points in zebrafish recovery. Fish were then sacrificed, and their brains dissected. Using immunofluorescence, the outer left optic tectum of the zebrafish was imaged, and mean image pixel fluorescent intensity was taken. There were significant changes (one-way ANOVA) in the levels of GLYT2 compared to that of the control groups during the course of recovery. GLYT2 levels continued to rise through the 24-hour recovery mark but did not show significant difference after …
Date:
July 2023
Creator:
Auzenne, Alexis
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Blockchain for AI: Smarter Contracts to Secure Artificial Intelligence Algorithms
In this dissertation, I investigate the existing smart contract problems that limit cognitive abilities. I use Taylor's serious expansion, polynomial equation, and fraction-based computations to overcome the limitations of calculations in smart contracts. To prove the hypothesis, I use these mathematical models to compute complex operations of naive Bayes, linear regression, decision trees, and neural network algorithms on Ethereum public test networks. The smart contracts achieve 95\% prediction accuracy compared to traditional programming language models, proving the soundness of the numerical derivations. Many non-real-time applications can use our solution for trusted and secure prediction services.
Date:
July 2023
Creator:
Badruddoja, Syed
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Healthy cities initiative in China: Progress, challenges, and the way forward
Article discusses how China implemented the first phase of its National Healthy Cities pilot program from 2016-20. Authors recommend aligning the Healthy Cities initiative in China with strategic national and global level agendas such as Healthy China 2030 and the Sustainable Development Goals (SDGs) by providing an integrative governance framework to facilitate a coherent intersectoral program to systemically improve population health.
Date:
July 15, 2022
Creator:
Bai, Yuqi; Zhang, Yutong; Zotova, Olena; Pineo, Helen; Siri, José; Liang, Lu et al.
Object Type:
Article
System:
The UNT Digital Library
PharmaChain: A blockchain to ensure counterfeit‐free pharmaceutical supply chain
Article discusses how globalisation has facilitated different industries to eliminate geographical boundaries and equipped organisations to work collectively to produce goods. The authors of the article propose a novel Distributed Ledger Technology (DLT) based transparent supply chain for PSC and proof-of-concept is implemented to analyse the scalability and efficiency of the proposed architecture.
Date:
July 5, 2022
Creator:
Bapatla, Anand K.; Mohanty, Saraju P.; Kougianos, Elias; Putha, Deepak & Bapatla, Anusha
Object Type:
Article
System:
The UNT Digital Library
Classroom observations of a cross-age peer tutoring mathematics program in elementary and middle schools
Article describes how a growing body of research has shown the positive effects of peer tutoring on students’ academic achievement, self-concept, attitude, social, and behavioral outcomes. The authors' study examined classroom practices, as well as program teachers’ and students’ behaviors within a cross-age peer-tutoring program implemented in elementary and middle schools that serve predominantly Hispanic students.
Date:
July 1, 2023
Creator:
Barahona, Elba; Padrón, Yolanda N. & Waxman, Hersh C.
Object Type:
Article
System:
The UNT Digital Library
Implementing Faceted Application of Subject Terminology (FAST) at the University of North Texas
Presentation on the University of North Texas Libraries’ implementation of Faceted Application of Subject Terminology (FAST) headings in their catalog. It was presented at the American Library Association's (ALA) Core Interest Group Week event which was held virtually on July 26-30, 2021.
Date:
July 27, 2021
Creator:
Baron, Adam & Thomale, Jason
Object Type:
Presentation
System:
The UNT Digital Library
Psychometric Evaluation of the Posttrauma Risky Behaviors Questionnaire: Item Response Theory Analyses
This article investigates the psychometric properties of the Posttrauma Risky Behaviors Questionnaire (PRBQ) using item response theory to examine (a) item analysis (b) person fit, and (c) differential item functioning (DIF) across gender-based groups and two different samples.
Date:
July 30, 2021
Creator:
Batley, Pathiba Natesan; Contractor, Ateka A.; Weiss, Nicole; Compton, Sidonia E. & Price, Matthew
Object Type:
Article
System:
The UNT Digital Library
Evidence and reporting standards in N-of-1 medical studies: a systematic review
Article describes how authors examined publications of medical N-of-1 trials to examine whether they meet the evidence standards and the criteria for demonstrating evidence of a relation between an independent and an outcome variable per the What Works Clearinghouse (WWC) standards for SCEDs. The authors also examined the appropriateness of the data analytic techniques in the special context of N-of-1 designs.
Date:
July 18, 2023
Creator:
Batley, Prathiba Natesan; McClure, Erica B.; Brewer, Brandy; Contractor, Ateka A.; Batley, Nicholas John; Hedges, Larry Vernon et al.
Object Type:
Article
System:
The UNT Digital Library
Reference materials for phase equilibrium studies. 1. Liquid–liquid equilibria (IUPAC Technical Report)
This article is the first of three projected IUPAC Technical Reports resulting from IUPAC Project 2011-037-2-100 (Reference Materials for Phase Equilibrium Studies). This report proposes seven systems for liquid–liquid equilibrium studies, covering the four most common categories of binary mixtures: aqueous systems of moderate solubility, non-aqueous systems, systems with low solubility, and systems with ionic liquids.
Date:
July 8, 2021
Creator:
Bazyleva, Ala; Acree, William E. (William Eugene); Chirico, Robert D.; Diky, Vladimir; Hefter, Glenn T.; Jacquemin, Johan et al.
Object Type:
Article
System:
The UNT Digital Library
[Miriam Beard and friends at Bishop Cidercade Dallas]
Photograph of Miriam (Mimi) Beard, her husband, and her brother at Bishop Cidercade in Dallas, Texas in July 2021 where they went out for the first time to have fun.
Date:
June 17, 2020
Creator:
Beard, Miriam
Object Type:
Photograph
System:
The UNT Digital Library