UNT Theses and Dissertations - 131 Matching Results

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Measurement of Positive Continuance Intention Drivers within a Service Domain

Description: The contribution of this dissertation is how model measurement allows examination of the balance between what is practical in terms of consumer concerns versus what is optimal in terms of cost control. Essay 1 examines a research framework that incorporates various service recovery strategies and simultaneously evaluates their comparative influences. Essay 2 evaluates the complex interrelationships among different factors related to the post-complaint behavioral process. Essay 3 fills a researc… more
Date: August 2019
Creator: Harun, Md Ahasan Uddin
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Partner: UNT Libraries

The Metabolic Physiology of Planarian Flatworms

Description: Using a high throughput closed respirometry method to measure oxygen consumption, I determined metabolic rates in asexual and sexual Schmidtea mediterranea and Girardia dorotocephala, as a function of temperature, taxon, stressors, reproductive mode, age, regeneration, and specific dynamic action. This study has shown that oxygen consumption can reliably be measured in planaria using optode closed respirometry, and also provided a reliable method for measuring wet mass in planaria, which has be… more
Date: August 2019
Creator: Lewallen, Melissa A
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Method Development for Corrosion Testing of Carbon Steel and Ni-based Alloy Coatings Exposed to Gas Hydrate Formation Environments

Description: Gas hydrate formation and corrosion can cause serious safety and flow assurance problems in subsea environments. One aspect that has been given less attention is the corrosion behavior of materials in gas hydrate formation environment (GHFE). This work introduces a new technique/method for corrosion testing of materials exposed to low temperatures GHFEs. This technique allows pH monitoring, and control of test conditions like temperature. In this work, GHFE is defined as an environment that inc… more
Date: August 2019
Creator: Ozigagu, Christopher E.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Military and Veteran Mental Health Stigma and Help-Seeking Behaviors: Role of Leadership and Attachment

Description: Mental health stigma has been identified as a barrier to help-seeking in the United States. Research suggests that insecure attachment may contribute to higher mental health stigma and lower help-seeking behavior. This may be particularly salient in military personnel who tend to report higher mental health stigma than the general population. Evidence suggests that both supportive and destructive military leadership are related to service members' attitudes toward seeking help. In the current s… more
Date: August 2019
Creator: McGuffin, James
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Mining Biomedical Data for Hidden Relationship Discovery

Description: With an ever-growing number of publications in the biomedical domain, it becomes likely that important implicit connections between individual concepts of biomedical knowledge are overlooked. Literature based discovery (LBD) is in practice for many years to identify plausible associations between previously unrelated concepts. In this paper, we present a new, completely automatic and interactive system that creates a graph-based knowledge base to capture multifaceted complex associations among … more
Date: August 2019
Creator: Dharmavaram, Sirisha
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Modeling Marijuana Use Willingness and Problems as a Function of Social Rejection and Social Anxiety

Description: Marijuana is the second most commonly used substance in the US. A growing literature suggests that socially anxious individuals use marijuana to manage their symptoms in social situations, which may explain why they are also more likely to experience problems. Unfortunately, the majority of the literature is based on research conducted with adult samples or the co-occurrence of diagnoses in adolescent samples. The proposed study sought to test the link between social anxiety (SA) and proxies fo… more
Date: May 2019
Creator: Cloutier, Renee
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Nano-Manufacturing of Catalytic Amorphous Alloys

Description: 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 … more
Date: December 2019
Creator: Hasannaeimi, Vahid
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

A Novel Two-Stage Adaptive Method for Estimating Large Covariance and Precision Matrices

Description: Estimating large covariance and precision (inverse covariance) matrices has become increasingly important in high dimensional statistics because of its wide applications. The estimation problem is challenging not only theoretically due to the constraint of its positive definiteness, but also computationally because of the curse of dimensionality. Many types of estimators have been proposed such as thresholding under the sparsity assumption of the target matrix, banding and tapering the sample c… more
Date: August 2019
Creator: Rajendran, Rajanikanth
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Partner: UNT Libraries

Optimizing Production System Maintenance Policies when Cyber Threats are Considered

Description: In a production environment, physical and cyber-related failures become unavoidable because of the complexity of highly connected manufacturing systems and a finite equipment life cycle. The main purpose of this thesis is to investigate optimal maintenance outsourcing and replacement policies in the presence of cyber-threats, as well as policies to achieve channel coordination via cost subsidization. Although well-developed maintenance outsourcing literature has addressed many advanced and tren… more
Date: August 2019
Creator: Ta, Anh V
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Partner: UNT Libraries

PAOFLOW-Aided Computational Materials Design

Description: Functional materials are essential to human welfare and to provide foundations for emerging industries. As an alternative route to experimental materials discovery, computational materials designs are playing an increasingly significant role in the whole discovery process. In this work, we use an in-house developed python utility: PAOFLOW, which generates finite basis Hamiltonians from the projection of first principles plane-wave pseudopotential wavefunctions on pseudo atomic orbitals(PAO) for… more
Date: December 2019
Creator: Wang, Haihang
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Parallel Analysis of Aspect-Based Sentiment Summarization from Online Big-Data

Description: Consumer's opinions and sentiments on products can reflect the performance of products in general or in various aspects. Analyzing these data is becoming feasible, considering the availability of immense data and the power of natural language processing. However, retailers have not taken full advantage of online comments. This work is dedicated to a solution for automatically analyzing and summarizing these valuable data at both product and category levels. In this research, a system was develo… more
Date: May 2019
Creator: Wei, Jinliang
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Partner: UNT Libraries

A Pedagogical Guide to the Piccolo Trumpet

Description: The modern piccolo trumpet is required by professional trumpet players for the performance of solo repertoire, chamber music, orchestra, and wind band. Students in universities around the world study the piccolo trumpet in preparation for professional careers, but relatively few pedagogical tools exist to specifically focus on the nuanced techniques of the instrument such as articulation, range, and sound production. The purpose of this project is to create a pedagogical guide that can serve as… more
Date: May 2019
Creator: Goldman, Casey
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Perceptions of School Administrators on Evidence-Based Practices in Transition Planning for Students with Autism Spectrum Disorder

Description: Poor post-school outcomes for young adults with an autism spectrum disorder (ASD) have underscored the need to gain insight into the use of evidence-based practices (EBPs) in the planning and implementation of transition services. EBPs for effective transition planning and implementation have been documented in the literature but do not appear to be fully utilized in practice to achieve desired student outcomes, reflecting a research-to-practice gap. EBPs have the potential to produce positive … more
Date: May 2019
Creator: Thomas, Jamie Allison
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

A Performance and Security Analysis of Elliptic Curve Cryptography Based Real-Time Media Encryption

Description: This dissertation emphasizes the security aspects of real-time media. The problems of existing real-time media protections are identified in this research, and viable solutions are proposed. First, the security of real-time media depends on the Secure Real-time Transport Protocol (SRTP) mechanism. We identified drawbacks of the existing SRTP Systems, which use symmetric key encryption schemes, which can be exploited by attackers. Elliptic Curve Cryptography (ECC), an asymmetric key cryptography… more
Date: December 2019
Creator: Sen, Nilanjan
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Partner: UNT Libraries

A Performance Edition of the Vespers Settings in Sacri E Festivi Concenti, Opera Nona by Giovanni Legrenzi

Description: Giovanni Legrenzi was a prolific composer of vocal music and maestro di cappella at the Basilica di San Marco but his vocal works are not often studied as a part of the Venetian lineage with composers such as Willaert, de Rore, Zarlino, Monteverdi, Cavalli, and Vivaldi. Despite his being a prolific composer who had significant influence on the work of other musicians in the traditional canon, references to Legrenzi in standard music publications (Grout, Taruskin, Grove Music Online, etc.) are a… more
Date: May 2019
Creator: Sullivan, Ryan W.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Phase Transformation and Elastic Constants in Binary Titanium Alloys: An Atomistic Study

Description: The current understanding of the mechanical properties and deformation behavior of some individual phases in titanium alloys is limited due to the fine scale at which these phases precipitate within the β-phase matrix. The α and ω phases represent the most widely observed phases in titanium alloys depending on the alloy composition and also the heat treatment procedure adopted during processing. The possibility of precipitating ω-phase depends on the content of the β-stabilizers within the syst… more
Date: August 2019
Creator: Salloom, Riyadh Farooq
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Phase Transformations in Refractory High Entropy Alloys

Description: High entropy alloys (HEAs) based on refractory elements have shown a great potential for high temperature structural applications. In particular, the ones containing Al, exhibits a microstructure similar to the γ-γ' in Ni-based superalloys. While these alloys exhibit impressive strengths at room temperature (RT) and at elevated temperatures, the continuous B2 matrix in these alloys is likely to be responsible for their brittle behavior at RT. Phase stability of five such alloys are studied by t… more
Date: August 2019
Creator: Soni, Vishal
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Partner: UNT Libraries

Phenotype Analysis of the CISD Gene Family Relative to Mitochondrial Function in Caenorhabditis elegans

Description: NEET proteins belong to a unique class of [2Fe-2S] cluster proteins that have been shown to participate in various biological processes such as regulating iron, reactive oxygen species and apoptosis within the cell and are localized to the mitochondria. Disruption of the mitochondrial NEET proteins are associated with different human diseases such as obesity, neurodegeneration, cancer and diabetes. In humans, a missense mutation in the CISD2 gene results in a heritable multisystem disorder term… more
Date: December 2019
Creator: Mungwira, Chipo F
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

The Power of Place: A Qualitative Evaluation of Stream Monitoring Data Usage by Decision-Makers in Dane County, Wisconsin

Description: Has years of citizen-based nutrient sampling and baseline water quality monitoring efforts only had a "trivial" impact on natural resource management decisions? This thesis will explore this and other findings from a qualitative evaluation of the Rock River Coalition (RRC) citizen-based stream monitoring project in Dane County, Wisconsin, USA. These findings are the culmination of 47 semi-structured interviews with decision-makers from seven client-identified categories and participant observat… more
Date: May 2019
Creator: Semlow, Andrea R.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Praseodymium Oxide and Organic Modified Cerium Oxide Nanoparticles for Electrodeposition of Nickel-Ceramic Nanocomposites to Enhance Corrosion Protection and Mechanical Properties

Description: There is a consistent need in many industries, especially oil and gas, to develop coatings which have higher corrosion resistance and better hardness to extend the lifetime of equipment when it is exposed to hostile environments. Electrodeposition has been a favorable method in the synthesis of metal coatings because of its low cost, convenience, ability to work at low temperatures, and ability to control surface morphology and structure. The inclusion of ceramic nanoparticles in metal matrix c… more
Date: May 2019
Creator: Sanders, Stephen
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Preparing and Using Hydrophobic Fluorinated Polymers for Corrosion Protection on Aluminum Substrate

Description: Corrosion is one of the most expensive failures in industries that used metal components and other construction materials. In fact, corrosion is responsible for hundreds of billions-dollar loss in the US alone each year. In general, corrosion occurs when metal surfaces are exposed to water, oxygen, acids, bases, or salts. Therefore, metal substrates must be protected by using materials that act as barriers to avoid destructive corrosion attack. Aluminum is one of the most common metals used in … more
Date: May 2019
Creator: Yaseen, Waleed Khaleel
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Prevalence and Proportionality of Dyslexia in Texas Public and Charter School Districts

Description: Passed in 1985, the Texas Education Code (TEC) §38.003, Screening and Treatment of Dyslexia and Related Disorders, required public school districts and charters to identify and provide remediation services for students with dyslexia. While Texas was the first state to pass such a requirement, the question remains: What is the prevalence and proportionality of dyslexia in Texas public school districts and charters? In Phase 1 of this study, a secondary analysis using point prevalence and disprop… more
Date: August 2019
Creator: Sneed, Samantha
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Process-Structure-Property Relationships in Friction Stir Welded Precipitation Strengthened Aluminum Alloys

Description: Through a series of carefully designed experiments, characterization and some modeling tools, this work is aimed at studying the role of thermal profiles on different microstructural zones and associated properties like strength and corrosion through a variation of weld parameters, thermal boundary conditions and material temper. Two different alloys belonging to the Al-Cu and Al-Cu-Li system in different temper conditions- peak aged (T8) and annealed (O) were used. A 3D-thermal pseudo mechanic… more
Date: May 2019
Creator: Mondal, Barnali
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Partner: UNT Libraries

Processing-Structure-Property Relationships of Reactive Spark Plasma Sintered Boron Carbide-Titanium Diboride Composites

Description: Sintering parameter effects on the microstructure of boron carbide and boron carbide/titanium diboride composites are investigated. The resulting microstructure and composition are characterized by scanning electron microscopy (SEM), x-ray microscopy (XRM) and x-ray diffraction (XRD). Starting powder size distribution effects on microstructure are present and effect the mechanical properties. Reactive spark plasma sintering introduces boron nitride (BN) intergranular films (IGF's) and their eff… more
Date: August 2019
Creator: Lide, Hunter
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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