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2022

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Multi-Level Characterization Of Plasticity, Fracture, And Phase Transformation In Metals With Hexagonal Close-Packed Structure, Evgenii Vasilev Dec 2022

Multi-Level Characterization Of Plasticity, Fracture, And Phase Transformation In Metals With Hexagonal Close-Packed Structure, Evgenii Vasilev

Doctoral Dissertations

In this thesis, contributions to characterization of plasticity, fracture, and phase transformation in metals with hexagonal close-packed structure are presented. First, the structure-properties correlations are established for Mg-1.3Zn-0.4Ca-0.4Mn and Mg-1.5Nd alloys. Next, the role of microstructural features such as gran/twin boundaries in the development of damage and fracture in magnesium is discussed. Then, a structure metric for quantitative assessment of fracture is developed and validated on magnesium and titanium alloys. Experimental studies on plasticity are followed by crystal plasticity modelling of Taylor impact test on zirconium to correlate experimental and predicted evolution of microstructure and shape change. Finally, a phase …

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The Layer That Did Not Swim Away: Broadband Acoustic Discrimination And Characterization Of Ocean Stratification, Elizabeth Reed-Weidner Dec 2022

The Layer That Did Not Swim Away: Broadband Acoustic Discrimination And Characterization Of Ocean Stratification, Elizabeth Reed-Weidner

Doctoral Dissertations

Ocean stratification plays a critical role in many oceanographic processes. The magnitude of mixing between stable water masses is regulated, in part, by the intensity of stratification. As such, stratification modulates the vertical transport of heat and many important dissolved constituents in the water column, influencing such processes as ocean ventilation, and ocean heat and carbon uptake. As human induced climate change alters oceanic stratification a thorough understanding of its distribution and variability is critical in the study of the world’s oceans. However, traditional methods are limited in terms of spatial context and rapid, near-synoptic observational methods, such as those …

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A Comprehensive Analysis Of The Evolution Of Coastal Flooding In Texas And Louisiana For Application In Risk Assessment, Joshua Pulcinella Dec 2022

A Comprehensive Analysis Of The Evolution Of Coastal Flooding In Texas And Louisiana For Application In Risk Assessment, Joshua Pulcinella

Earth & Environmental Sciences Dissertations

Coastal communities of the northern Gulf of Mexico have historically been at risk of flooding from tropical cyclone induced storm surge and extreme precipitation. Relative sea level rise resulting from a combination of increasing global mean sea level and regional subsidence presents an escalating threat that requires a comprehensive assessment of changing flood risks for the area. This study examines how coastal flooding events are changing and focuses on the future risks to communities and infrastructure in Texas and Louisiana. Utilizing historic tide gauge observations, tropical cyclone records, and associated storm tide data, the frequency, duration, and magnitude of events …

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Investigating The Frictional Properties Of Organic Matter And Pore Structure Of Organic-Rich Shales With Atomic Force Microscopy And Scanning Electron Microscopy, Farnood Sobhbidari Dec 2022

Investigating The Frictional Properties Of Organic Matter And Pore Structure Of Organic-Rich Shales With Atomic Force Microscopy And Scanning Electron Microscopy, Farnood Sobhbidari

Earth & Environmental Sciences Dissertations

Understanding geomechanical properties of shales, such as stiffness properties and fracture toughness, is important in different areas of petroleum industry-related activities including fracturing efficiency, petroleum flow to the wellbores, and induced seismicity. Nanoscale to microscale experiments on shale samples require a much smaller sample compared to macroscale experiments. This is a major advantage because irregularly-shaped drill cuttings from shales can be used for experimental analyses, such as nanoindentation or atomic force microscopy (AFM). However, a characterization of mechanical properties at the nano- to micro-scale is a relatively new addition to classical geomechanical experiments on shales, and there is still lack …

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Transcriptomic Signal Of Reproductive Modes And Early Speciation In Daphnia Pulex-Pulicaria System, Trung Viet Huynh Dec 2022

Transcriptomic Signal Of Reproductive Modes And Early Speciation In Daphnia Pulex-Pulicaria System, Trung Viet Huynh

Biology Dissertations

Daphnia have been gaining recognition as a key model system for studies of evolution, ecology, toxicology, and more recently genomics. The defining characteristic of this particular model system is its phenotypic plasticity and its responsiveness to environmental cues. At the same time, the advent of RNA sequencing technology has helped researchers gain new insights on the plasticity of gene expression and its role linking environmental cues with the physiological response mounted by the organism. Although many RNA-seq studies have been conducted in Daphnia, surprisingly no one has recorded the gene expression profile of one of Daphnia’s most famous phenotypic plastic …

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Machine Learning-Based Methods For The Segmentation Of Scanning Electron Microscopy Images Of Fine-Grained Shale Samples, Binqian Yin Dec 2022

Machine Learning-Based Methods For The Segmentation Of Scanning Electron Microscopy Images Of Fine-Grained Shale Samples, Binqian Yin

Earth & Environmental Sciences Dissertations

The segmentation of scanning electron microscopy (SEM) images is critical yet time-consuming for geological studies, as it will need to differentiate the boundaries for different mineral objects to facilitate subsequent analyses, such as porosity calculation. Recently, machine learning methods, especially convolutional neural networks (CNNs), have been explored to segment SEM images for fine-grained shale samples. However, existing methods fail to address two critical issues in the segmentation of shale rock images---insufficient labeled data and imbalanced objects. To this end, this dissertation has proposed a machine learning pipeline that consists of supervised, semi-supervised, and active learning stages to reduce manual efforts …

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Probing Short-Range Structural Distortion Of Stereochemically Active Lone Pairs In Extended Solid-State Materials, Uyen Phuong Dang Dec 2022

Probing Short-Range Structural Distortion Of Stereochemically Active Lone Pairs In Extended Solid-State Materials, Uyen Phuong Dang

Chemistry & Biochemistry Dissertations

The structural and electronic effects of the lone pairs play an important role in magnetic, photocatalytic, and semiconducting behaviors of materials. Investigating the role of stereochemically active ns2 lone pairs derived from p-block cations in solid-state materials is important to phenomena associated with polarizable bonding, e.g., ferroelectricity. The effect of lone pairs in ferroelectric polarization has been studied on the lead metaniobate in which the covalency between Pb and O stabilizes the in-plane polarization which leads to orthorhombic symmetry. PbTiO3 has been widely studied for ferroelectric polarization associated with the off-centering of Ti in TiO6 due to the characteristic 6s2 …

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Additive Manufacturing Of Stretchable Piezo-Resistive Sensors: Fabrication And Performance Evaluation, Mohammad Ahnaf Shahriar Dec 2022

Additive Manufacturing Of Stretchable Piezo-Resistive Sensors: Fabrication And Performance Evaluation, Mohammad Ahnaf Shahriar

Industrial, Manufacturing, and Systems Theses

Additive manufacturing provides a distinctive layer-wise production method, which is efficient and effective, especially when fabricating products with complex designs and/or multiple materials. One of the promising applications of additive manufacturing is 3D printing flexible piezo-resistive sensors, which measure the strain of human motions by characterizing the changes in resistance. In this research, fused deposition modeling is used to fabricate stretchable piezo-resistive sensors that use thermoplastic polyurethane (TPU) as the stretchable layer and the mixture of TPU and carbon nanotube (CNT) as the electrically conductive layer. Extensive experimental efforts are dedicated to investigating proper mixing technique, filament preparation method, and …

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Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim Dec 2022

Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim

Civil Engineering Theses

Disposal of solid waste becomes a global issue due to it contains a large amount of non- degradable polymers and may lead to many environmental issues. With the scarcity of space for landfilling and due to ever increasing cost, finding ways to handle these wastes without endangering the environment is crucial. One of these methods is to use plastic wastes as one of the pavement materials. In this study, a new method of subgrade soil stabilization of pavement is proposed where soil will be stabilized by mixing only plastic with soil for the treatment of subgrade. In order to demonstrate …

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Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed Dec 2022

Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed

Civil Engineering Theses

Texas soils typically have sulfate content due to certain geologic formation types. Soil sulfate needs to be identified and quantified to minimize damage to infrastructure caused by sulfate-induced heave. Electrical Resistivity Imaging can identify the presence of sulfate content in the soil. Electrical Resistivity Imaging (ERI) is a non-destructive and fast way of obtaining continuous soil substructure profiles. Moisture fluctuations and soil heterogeneities can be found using an ERI approach. As a result, ERI is growing in popularity as a tool in geotechnical engineering, yet at the moment, it only offers qualitative data. It can be challenging to determine quantitative …

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Graph Representation Learning For Heterogeneous Multimodal Biomedical Data, Nhat Chau Tran Dec 2022

Graph Representation Learning For Heterogeneous Multimodal Biomedical Data, Nhat Chau Tran

Computer Science and Engineering Dissertations

The emergence of high-throughput sequencing technology has generated a wealth of “multi-omics” data, capturing information about different types of biomolecules at multiple levels. Since large-scale genomics, transcriptomics, and proteomics data are becoming publicly available, integrated systems analysis utilizing these data sources has taken the front seat in deriving valuable insights for identifying cancer biomarkers or predicting interactions and functions for novel molecules such as LncRNAs. The graph representation learning paradigm can address these challenging tasks as among the most promising approaches to improve predictions over sparsely annotated molecular entities and to provide representation capacity and interpretability over heterogeneous and hierarchically …

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Approximate Query Processing Using Deep Learning And Database Techniques, Shohedul Hasan Dec 2022

Approximate Query Processing Using Deep Learning And Database Techniques, Shohedul Hasan

Computer Science and Engineering Dissertations

Data is generated at an unprecedented rate surpassing our ability to analyze them. In real applications, it is often impractical to find an exact answer by traversing the entire data. As a result, Approximate Query Processing (AQP) is getting extremely popular, which finds an approximate answer in a quick time by sacrificing a fraction of accuracy. This dissertation focuses on developing different AQP techniques to solve fundamental database problems using deep learning. Moreover, we build a fast and scalable algorithm for Quantile Regression, a well-known regression technique that can help minimize the uncertainty in the recent deep learning-based AQP solutions, …

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Pharmacogenomics Translation In A Community Medical Context Using A Diffusion Of Innovations Framework: Provider Perspectives And Evaluation Implications, Sabrina Ewald Holley Dec 2022

Pharmacogenomics Translation In A Community Medical Context Using A Diffusion Of Innovations Framework: Provider Perspectives And Evaluation Implications, Sabrina Ewald Holley

Dissertations

Translation, in the context of medical research, is a process that describes how knowledge and innovation move and change into real world applications and outcomes. This study explores the translation of a medical innovation, pharmacogenomics (PGx), from research into clinical practice using the perspectives of medical providers in a community setting. PGx is the influence of a person’s genetics on drug response. Despite being available for over a decade, PGx testing is not widely adopted. Prior research primarily examined PGx translation in large academic medical centers, but not much is known about it in community practice settings. A better understanding …

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Amorphous Silicon Oxynitride Coatings For Craniofacial Implants Stimulate Osteogenesis Via Nrf2 Antioxidant Activity, Neelam Ahuja Dec 2022

Amorphous Silicon Oxynitride Coatings For Craniofacial Implants Stimulate Osteogenesis Via Nrf2 Antioxidant Activity, Neelam Ahuja

Kinesiology Dissertations

Craniomaxillofacial injuries and defects are functionally and socially debilitating. These defects require immediate attention, and most cases undergo reconstruction surgery to restore the lost tissues. Current treatment strategies such as autologous bone grafts and fixative titanium devices are well established to treat the craniofacial region. But, the limited supply of donor bone and secondary surgery limit the use of autologous bone grafts, and low bioactivity, poor osteointegration of the titanium devices, has led to an increased number of tissue engineering research for the development of newer biomaterials. Bone defects especially in the craniofacial region can have a significant portion of …

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The Role Of Muscle Damage On Joint Tissue, Logan Nicholas Moore Dec 2022

The Role Of Muscle Damage On Joint Tissue, Logan Nicholas Moore

Kinesiology Dissertations

The musculoskeletal system is a highly diverse network of tissue that operates in conjunction to one other, both mechanically and biochemically. In states of disorder such as musculoskeletal disorders, this cross-communication between tissues is pivotal in the progression of disease state in other tissues, or the prevention and healing of the effected tissue. Musculoskeletal disorders (MSkD) are a broad term encompassing disorders to bones, joints, muscles and connective tissues. These disorders include Osteoarthritis, Osteopenia, Sarcopenia, Tendonitis, Myopathies, and muscle weakness. Osteoarthritis (OA) is the most common joint disorder, characterized as damage to the articulating cartilage and alterations in other joint …

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Physical Modeling Of Filament Growth And Resistive Switching In Metal Oxide-Based Rram, Kena Zhang Dec 2022

Physical Modeling Of Filament Growth And Resistive Switching In Metal Oxide-Based Rram, Kena Zhang

Material Science and Engineering Dissertations

Metal oxide-based resistive random-access memories (RRAM) exhibit several excellent performances, such as nanosecond switching speed, large write-erase endurance, and long retention time, and can potentially replace the traditional circuit elements for use as the fundamental units in next-generation hardware deep-learning or neuromorphic systems. The functionality of a metal oxide-based RRAM is attributed to an oxygen vacancy (V_O^(..))-rich conductive filament (CF), which initially forms, and later dissolves or regrows inside the oxide layer during the resistive switching process. However, the complicated interplays among the coexisting chemical, electrical, mechanical, and thermal effects during the formation, growth, and rupture of the CFs make …

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Intuitive Robot Integration Via Virtual Reality Workspaces, Minh Tram Dec 2022

Intuitive Robot Integration Via Virtual Reality Workspaces, Minh Tram

Computer Science and Engineering Theses

As robots become increasingly prominent in diverse industrial settings, the desire for an accessible and reliable system has correspondingly increased. Yet, the task of meaningfully assessing the feasibility of introducing a new robotic component, or adding more robots into an existing infrastructure, remains a challenge. This is due to both the logistics of acquiring a robot and the need for expert knowledge in setting it up. In this paper, we address these concerns by developing a purely virtual simulation of a robotic system. Our proposed framework enables natural human-robot interaction through a visually immersive representation of the workspace. The main …

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Data Discovery Analysis On Complex Time Series Data, Peter Lawrence Severynen Dec 2022

Data Discovery Analysis On Complex Time Series Data, Peter Lawrence Severynen

Computer Science and Engineering Theses

Complex time series are a ubiquitous form of data in the modern world. They have wide application across many different fields of scientific inquiry and business endeavor. Time series are used to understand and forecast weather patterns, voting patterns, computer network traffic, population health outcomes, demographic changes, the results of scientific experiments, and the performance of stocks and mutual funds. But time series can be difficult to analyze by conventional methods when the data is multivariate, incomplete, or in different formats. To address these issues, an investigation of several multivariate time series datasets was performed using the methods of automatic …

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Effects Of Graphene In High-Density Polyethylene Microfibers, Ashish Lal Sivadas Anilal Dec 2022

Effects Of Graphene In High-Density Polyethylene Microfibers, Ashish Lal Sivadas Anilal

Material Science and Engineering Theses

High-Density Polyethylene uniquely can induce banded spherulites as it is crystallized from its melt. We studied the effects of graphene in the crystallography of banded HDPE by examining parameters such as the extent of twisting, spherulitic growth, and nucleation density. The application of graphene as a multifunctional filler in polymer matrices is a great topic of interest because graphene at low concentrations can bring many improvements in mechanical, electrical, and thermal properties. We synthesized graphene oxide by chemical oxidation of graphite and further studied its effects in the twisted crystallography of HDPE. Three batches of fibers were extruded: two batches …

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The Influence Of African American Women's Values And Beliefs On Moderate Intensity Physical Activity: A Qualitative Study, Shannon Whitehead Dec 2022

The Influence Of African American Women's Values And Beliefs On Moderate Intensity Physical Activity: A Qualitative Study, Shannon Whitehead

Nursing Dissertations

THE INFLUENCE OF AFRICAN AMERICAN WOMEN’S VALUES AND BELIEFS ON MODERATE INTENSITY PHYSICAL ACTIVITY: A QUALITATIVE STUDY Routine participation in moderate intensity physical activity (MIPA) is one of the most important low-cost activities people can do for optimal health (USDHHS, 2018). Yet, for more than four decades, MIPA participation rates for AAW have been among the lowest compared to other races, and consequently, their health has been among the poorest. AAW have higher prevalence rates for obesity, heart disease, stroke, breast cancer, type II diabetes, and associated premature death. Instead of MIPA participation rates improving, they begin to decline in …

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Age Differences In Preparing For, Responding To, And Recovering From The Covid-19 Pandemic: The Strengths Of Older Adults, Zhirui Chen Dec 2022

Age Differences In Preparing For, Responding To, And Recovering From The Covid-19 Pandemic: The Strengths Of Older Adults, Zhirui Chen

Social Work Dissertations

This dissertation consists of three independent articles, investigating the age differences in preparing for the continuation of COVID-19 pandemic, experiencing negative COVID-19 impacts across multiple domains, and psychologically recovering from cumulative disaster exposures during the COVID-19 pandemic, with an emphasis on the strengths of older adults. Data used were from the longitudinal research project “Vulnerability and Resilience to Disasters” conducted in Texas, Tennessee, and Alabama, USA. Multiple linear regressions from Article 1 (N = 450) showed that compared to those aged 65+, people aged 18-44 perceived a lower level of preparedness for the ongoing COVID-19; and there was no significant …

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Effect Of Centrifugal Force On The Load Capacity Of Thrust Gas Bearing, Rakan Mohammed Haidar Dec 2022

Effect Of Centrifugal Force On The Load Capacity Of Thrust Gas Bearing, Rakan Mohammed Haidar

Mechanical and Aerospace Engineering Theses

It has been known for many decades that both rigid and foil thrust bearings are two options in the market for high-speed turbomachinery systems. Their advantages encompass the lower manufacturing cost, the lighter weight, and the flexibility in allowing “component misalignment and runout.” When the operating fluid is air, the classical lubrication theory works perfectly. Any additional terms of the inertia effect might be somehow less significant and sometimes negligible since the viscous forces will be dominant, but this may not be the case if the bearing operates in a harsh environment, such as a high-pressure environment. Nonetheless, this is …

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Nurturing The Disease - A Glimpse From The Outside Looking In: An Autoethnographic Exploration Of The Nature Of Nurture And Its Role In Chronic Illness, Michelle Leeann Koudsi Dec 2022

Nurturing The Disease - A Glimpse From The Outside Looking In: An Autoethnographic Exploration Of The Nature Of Nurture And Its Role In Chronic Illness, Michelle Leeann Koudsi

Social Work Theses

This autoethnographic illness narrative explores nature versus nurture’s impact on chronic illness. The author argues that environmental factors play a significant role in the rise of chronic illnesses. My hope is that this study will allow society and healthcare providers to gain a deeper understanding of the connection between illness and trauma as well as the importance of quality, positive patient-provider relationships. This study also demonstrates the importance of establishing a connection within oneself to create self-awareness and emotional healing. Despite this study being one of the most mentally tasking things I have ever willingly chosen to do in my …

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Creative Collaboration In Rural Texas Communities, Kathryn May Lattimore Norris Dec 2022

Creative Collaboration In Rural Texas Communities, Kathryn May Lattimore Norris

Public Affairs Dissertations

The body of research investigating collaboration has grown exponentially in recent years with the realization of its potential in generating innovative solutions to complex problems. Even though an abundance of literature on collaboration exists, scholars have fallen short of understanding how collaboration works towards creativity. Lack of consensus on understanding how this critical construct functions has not only made furthering theory on the matter challenging for researchers, but also made recognizing, utilizing, and realizing the full benefit of collaboration difficult for practitioners. Until the ways collaboration can result in creative outcomes are better understood, practitioners will not be able to …

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Competence And Bias In The Provision Of Transgender Mental Health, Taylor Dahlia Bolinger Dec 2022

Competence And Bias In The Provision Of Transgender Mental Health, Taylor Dahlia Bolinger

Social Work Theses

Historically, clinicians have functioned as gatekeepers to access gender-affirming care for individuals identifying as transgender. However, current best practice standards by reputable professional associations have encouraged clinicians to minimize potential barriers for clients seeking gender-affirming care. This care includes hormone replacement therapy (HRT) and gender confirmation surgeries, and other gender-affirming interventions such as name and gender marker change. This study seeks to describe Texas clinicians’ attitudes toward transgender clients and their self-perceived competency to perform gender affirming care. Licensed mental health care clinicians were recruited from various professional associations to complete an anonymous internet-based survey on providing gender-affirming mental health …

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Exploring Culturally Relevant Responses To Latinx Student Mental Health, Sarah Elizabeth Herrera Dec 2022

Exploring Culturally Relevant Responses To Latinx Student Mental Health, Sarah Elizabeth Herrera

Social Work Dissertations

Social workers have an ethical obligation to challenge systemic oppression. Within the context of Latinx college students, there are many systemic barriers that negatively impact their mental health. Previous research focuses on identifying individual characteristics among Latinx students that promote academic success and psychological wellbeing. However, it is important to hold postsecondary education accountable for creating more inclusive environments that welcome the increased enrollment of Latinx students. The following dissertation explores culturally relevant responses to Latinx college student mental health. The first article is a qualitative interpretive meta-synthesis that explores how Latinx-specific programming shapes ethnic identity and psychological wellbeing among …

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Postpartum Depression And Covid-19: A Special Emphasis On Military Women, Lacey R. QuiￃﾱOnes Dec 2022

Postpartum Depression And Covid-19: A Special Emphasis On Military Women, Lacey R. QuiￃﾱOnes

Social Work Theses

The purpose of this study is to explore the possible factors that contribute to postpartum depression in military women during the COVID-19 pandemic. The study had a total of 10 participants who were recruited by snowball and purposive sampling. The participants agreed to an interview with questions related to their overall experience of becoming a mother during a pandemic. The data collected showed two main themes emerged: environment and support. Of those, five subthemes appeared: policies and procedures and healthcare staff; in-person support, educational support, and mental health support, respectively. These findings point to potential shortcomings surrounding perinatal care for …

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Energy Analysis Of Rear Door Heat Exchangers In Data Centers With Dynamic Workload Distribution, Sai Abhideep Pundla Dec 2022

Energy Analysis Of Rear Door Heat Exchangers In Data Centers With Dynamic Workload Distribution, Sai Abhideep Pundla

Mechanical and Aerospace Engineering Theses

In recent years, applications including IoT (Internet of Things), content delivery, and 5G have created a large demand for low-latency access to data processing and data storage. Traditional centralized data centers weren’t designed with those use cases in mind. Small data centers such as edge computing data centers and colocation data centers house more than half of all servers across the United States. Rear Door Heat exchangers (RDHx) provide an energy-efficient cooling solution to traditional CRAC/CRAH - based cooling methods by localizing the heat removal from the rack. With more control over air distribution through a shorter path between the …

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Conceptual Gas Turbine Hybrid Engine Design For High Speed Rail Locomotive Propulsion, Frank Roger Tennyson Dec 2022

Conceptual Gas Turbine Hybrid Engine Design For High Speed Rail Locomotive Propulsion, Frank Roger Tennyson

Mechanical and Aerospace Engineering Theses

The modern experimental jet train developed by Bombardier Transportation was designed to partner with the present day electrified Acela high speed trains. The Jet train would provide transportation to areas (Rural etc.), as well as transcontinental capabilities to existing towns and cities where electrified propulsion units are not feasible. The Bombardier Jet Train utilizes petroleum-based fuel, diesel engine power, and multiple turboshaft engines, for higher speeds. The Pratt and Whitney PW150 engine design parameters will be used to develop the Conceptual Hybrid Turbo Shaft Engine (CHTS). The newer Conceptual Hybrid Turbo Shaft Engine (CHTS) should increase engine performance, lower specific …

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Thermally Charging Capacitor: A New Protocol To Accurately Measure The Thermoelectric Potential, Amit Phalak Dec 2022

Thermally Charging Capacitor: A New Protocol To Accurately Measure The Thermoelectric Potential, Amit Phalak

Mechanical and Aerospace Engineering Theses

Harvesting energy from waste heat would benefit in creating sustainable systems. Specifically, thermoelectric energy conversion can be used for low-grade waste heat recovery. However, the efficiency of conventional solid-state (i.e., semiconductor) has reached to the upper limit and could not make any advancement for more than 30 years. As a paradigm shift from solid-state thermoelectric conversion, in this study, ionic thermoelectric phenomena in liquid are explored. An electrolyte, with disproportionate size of anions and cations, when subjected to a temperature gradient can experience induced ion separation. In the phenomenon known as “Soret effect”, the smaller ions with higher mobility move …

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