Digital Commons Network^™

Characterization Of Novel Self-Healing Polymer Blends For Additive Manufacturing, Truman James Word

Open Access Theses & Dissertations

This dissertation begins with an overview of novel polymer systems which have been developed by the Polymer Extrusion Lab at the University of Texas at El Paso. Many composite polymer systems have been created using many different polymers as well as ceramics and metals primarily in the form of powders added to the bulk polymer. The bulk of this work entails a study that was conducted to develop and characterize the mechanical, shape memory and self-healing properties of three polymer blends: polylactic acid (PLA) combined with maleated styrene-ethylene-butylene-styrene (SEBS-g-MA), acrylonitrile butadiene styrene (ABS) combined with maleated styrene-ethylene-butylene-styrene (SEBS-g-MA), and polylactic …

Outlier Detection In Multivariate And High-Dimensional Datasets, Yuanhong Wu

Open Access Theses & Dissertations

Accurate detection of outliers is crucial in the field of statistical analysis. Using classical statisticalmodels without considering the presence of outliers in the data can lead to misleading outcomes. There exist a myriad of procedures to detect outliers in statistics. We concentrate on the statistical techniques that can robustly identify outliers in data sets. To this end, we pursue two aims. First, we give an extensive overview of robust statistical methods which are still popular in recent years for outlier detection. We provide the definitions, algorithms and also discuss some important properties of these methods. Second, two real examples are …

Examining The Role Of Pretrial Detention On The Juvenile Plea Process, Isabelle May Clough

Open Access Theses & Dissertations

Plea bargains are a necessary part of the criminal justice system as a whole, and the juvenile justice system more specifically. However, juveniles may be at a particular disadvantage when entering into a plea bargain as a result of their developmental capacities. Pretrial detention in particular might influence the quality of the final plea agreement that a juvenile accepts, as adolescents would be motivated towards the short-term goal of being released from detention. The current study aimed to examine the relationship between juvenile pretrial detention and plea discounts through mediating relationships with number of attorneys and time to plea. Data …

Long-Term Effects Of Juvenile Ketamine And/Or Social Stress Exposure On Spatial Memory Performance In C57bl/6 Mice, Israel Garcia Carachure

Open Access Theses & Dissertations

Ketamine is administered to manage major depressive disorder in adolescent patients. However, the long-term effects of juvenile ketamine exposure on memory-related tasks have not been thoroughly assessed. Thus, we examined whether exposure to ketamine, psychological stress, or both, results in long-lasting alterations in spatial memory in C57BL/6 mice. Furthermore, we evaluated how ketamine and/or psychological stress history influenced hippocampal protein kinase b¬–mammalian target of rapamycin (AKT-mTOR)-related signaling, since this molecular cascade is associated with ketamine’s acute/fast-acting antidepressant properties. Male and female postnatal day (PD)-35 mice underwent 10-days of vicarious defeat stress (VDS), a form of psychological stress, with or without …

Structure Study Of Small Heat Shock Protein 27, Zhaobo Li

Open Access Theses & Dissertations

Molecular chaperones are a class of oligomeric proteins that play a critical role inpreventing the aggregation of non-native protein so that these proteins can later be refolded. Chaperones are ubiquitously expressed in all the kingdoms of life where their function is to counteract cellular stress and to maintain protein homeostasis. One subgroup of molecular chaperones is characterized by low molecular weight and are termed small heat shock proteins. The focus of the proposed research is the small heat shock protein 27 (Hsp27). Hsp27 is an ATP independent chaperone that is overexpressed in response to heat shock, radiation damage, oxidative damage, …

Re-Rhetoricizing Global Souths Contrapuntally: Borderless Transnational Feminist Design Justice, Bibhushana Poudyal

Open Access Theses & Dissertations

I intend this multimodal dissertation to function as a hypertextual and intertextual documentation of theories, practices, examples, methods, digital, and multimodal techniques for re-writing and re-rhetoricizing the differently situated Global Souths from the ground-up. I acknowledge the Global South as not only those geographies previously known as the Third World but also those spaces and communities within the Global North undergoing various forms of colonial, racist, neoliberal, and heteropatriarchal exploitations. Transnational feminist solidarities put the intersectional analysis of gender construction at the heart of its bottom-up resistance against global capitalism, environmental injustice, corporate violence, and imperialism. My dissertation includes several …

A Novel Neuroinvasive Infection Modality For Francisella Tularensis Elicits Neuroinflammation Resulting In Cellular Damage, Mireya Griselle Ramos-Muniz

Open Access Theses & Dissertations

Francisella tularensis (Ft.) is a gram-negative coccobacillus bacterium that causes the zoonotic disease tularemia in humans. Ft. causes the most severe, often fatal, form of the disease through inhalation. However, Ft. is most commonly transmitted through direct contact with infected animal carcasses such as rodents and rabbits, consumption of contaminated food or water, or through arthropod bites, particularly ticks. Due to its extremely low infectious dose, high mortality rate, and potential use as a biological warfare agent, Ft. is classified by the CDC as a "Tier 1 select agent". Ft. infection triggers an overactive inflammatory response, termed a "cytokine storm", …

Cyber-Physical Production Systems And Their Practical Integration And Application With Simio Software, Jose Carlos Garcia Marquez Basaldua

Open Access Theses & Dissertations

Industry 4.0 comprises a diverse array of technologies and components that are revolutionizing the manufacturing industry, from Digital Twins, Cyber-Physical Systems and Augmented Reality. The elements that englobe Industry 4.0 vary from framework to framework. Nevertheless, there are similarities in the available literature on what constitutes Industry 4.0. Some of the most critical components specified by the available literature include Digital Twins and Cyber-Physical Systems. A Factory Digital Twin is a virtual representation of a production system that can mimic the behavior of the physical asset. Moreover, a digital twin must have synchronization with its physical twin (i.e., production floor), …

Enhancing Earthquake Detection Through Machine Learning- An Application To The 2017 Mw 8.2 Tehuantepec Earthquake In Mexico, Marc Adrian Garcia

Open Access Theses & Dissertations

The Tehuantepec seismic gap, located off the southern shore of Oaxaca and Chiapas, Mexico, was previously thought to be an aseismic zone due to no significant event in 100 years. The September 8, 2017 (M8.2) Tehuantepec earthquake disproved this idea and added many questions surrounding the Mexican subduction zone. Specifically, the earthquake did not occur at the subduction megathrust. It ruptured the subducting plate below the megathrust and appeared to stop at the megathrust. Following this event, as well as the September 19, 2017 (M7.1) Morelos-Puebla earthquake, researchers from the University of Texas at El Paso (UTEP), Universidad Autónoma Cuidad …

A Systematic Compilation Of The Diversity, Equity, And Social Justice In Education (Desje) Program, Cynthia Ochoa

Open Access Theses & Dissertations

Exceling in formal education is one way to improve a personâ??s social mobility and life chances (McMahaon & Oketch, 2013). However, there is a long line of educational inequity in the United States from the founding of the nation to the present. People of color and minorities have fought long and hard for educational equity, with the most effective approaches being grassroots mobilization and court battles (Lopez & Burciaga, 2014). This includes examples such as California schools denying entrance to Chinese American children to enter schools based on their ancestry in the 1800s; the arrest of Margaret Douglass for teaching …

Nonlinear Propagation Of Quasiplanar Shear Wave Beams In Soft Elastic Media With Transverse Isotropy, John M Cormack, Mark F Hamilton

Faculty, Staff and Student Publications

Model equations are developed for shear wave propagation in a soft elastic material that include effects of nonlinearity, diffraction, and transverse isotropy. A theory for plane wave propagation by Cormack [J. Acoust. Soc. Am. 150, 2566 (2021)] is extended to include leading order effects of wavefront curvature by assuming that the motion is quasiplanar, which is consistent with other paraxial model equations in nonlinear acoustics. The material is modeled using a general expansion of the strain energy density to fourth order in strain that comprises thirteen terms defining the elastic moduli. Equations of motion for the transverse displacement components are …

A Translation Quality Assessment Of Two Translations Of Mahfouz’S Midaq Alley, M M Kullab Randa

Student Works (2020-2029)

Translation quality assessment (TQA) has been recently considered a productive research line and a fast-growing subfield of translation research. Reviewing the literature, TQA has been tackled either theoretically, applying a TQA model whereby the target text (TT) readers are completely ignored, or empirically, surveying the TT reader reception of the texts wherein the theory is marginalized. However, relying on a TQA model, in assessing the translation quality (TQ) without considering the TT readers concerns scholars since the major problem with whatever TQA model is lacking the empirical evidence from the TT readers. By contrast, TQA empirical studies are mainly inclined …

Microbial Associations With Metcalf's Tryonia, Tryonia Metcalfi (Gastropoda: Cochliopidae), An Imperiled Ciénega Endemic, Russell L. Minton, Kathryn E. Perez

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

The Chihuahuan Desert swamps are a hotspot for imperiled organisms including freshwater springsnails and bacteria. Many of these taxa are endemic to the desert and to the individual waterbodies where they occur. Efforts to conserve diversity in these threatened areas must account for the life history of the organisms, but also interactions between organisms including microbes. We documented the microbial assemblage associated with Tryonia metcalfi, a critically imperiled freshwater snail endemic to a ciénega system in western Texas. We identified 14 bacterial families in our snail samples and determined a core assemblage of 19 bacterial taxa (4 of which …

A Proof Of Concept For Detection Of Palato-Lingual Contact Without Intraoral Electrodes In A Human Participant, Amitava Biswas

Master's Theses

The author of this thesis conceived and investigated an unexpected electrical signal that may not be noticed during regular electroglottography (EGG) when electrodes are conventionally placed on the anterior surface of the throat. It appears that there is a measurable electrical signal from the EGG equipment when electrodes are placed over the frontal cheek (belly of zygomatic muscle), and the tongue is elevated to contact the hard palate, or the tongue is lowered to break the contact. Therefore, this phenomenon is designated as unconventional electroglottography (UEGG, Dr. Steven Cloud, private communication, July 17, 2022).

Two distinctive patterns of waveforms were …

Electrical Characterization Of Cementitious Composites, Abbas Ali

Theses and Dissertations

Multifunctional concrete using electrical conductivity gains attention for various nonstructural applications. Particularly, conductive concrete enables monitoring internal damages in concrete, which has been impossible by conventional nondestructive methods. On the other hand, most of on-going investigations on multifunctional concrete uses conductive additives to impart electrical conductivity into concrete, but this limits the multifunctional application to predesigned structures. Finding multifunctionality embedded in conventional concrete can open various possibilities for smart concrete. Aiming to finding the feasibility of using conventional concrete for multifunctional application, this study investigates the electrical properties of plain cementitious composites including cement paste, mortar, and concrete, but not …

An Investigative Study Of Potential Factors That Contribute To High Under-Five Mortality Rate In Africa, David Banahene

Theses and Dissertations

Under-Five Mortality remains a significant challenge in developing countries, especially in Africa. The United Nations has implemented various measures, such as the Millennium Development Goals (MDGs) and Sustainable Development Goals (SDGs), to combat this issue. However, the success of these initiatives is uncertain. Our study investigates the social, economic, and environmental factors contributing to high Under-Five Mortality rates in African countries, using data from 1985 to 2020.We analyzed 53 African countries, partitioning them into training (45 countries) and testing data (8 countries). We conducted Multiple Linear Regression analysis and assessed the model performance using R-squared values and Root-Mean-Squared-Error (RMSE) values. …

Dopamine Dysregulation In Antiretroviral Drugs Treated Neuronal Cells, Andrea S. Bustos

Theses and Dissertations

According to the world health organization (WHO), 37.7 million people worldwide in 2020 were living with the human immunodeficiency virus (HIV-1). In the US, combination antiretroviral therapy (cART) drugs have shown effectiveness in combating HIV-1 infection. As a result, cART has prolonged the lifespan of people with HIV aiding these patients to age with the virus. Clinical evidence has established the long-term effects of cART in the aging population causing neuropsychiatric disorders such as depression. However, the underline molecular mechanism that cART induces depression-related neurodegeneration has not been established. This study will pursue a dopamine (DA) dysregulation marker in cART …

A Machine Learning Approach To Evaluate The Effect Of Sodium-Glucose Cotransporter-2 Inhibitors On Chronic Kidney Disease In Diabetes Patients, Solomon Eshun

Theses and Dissertations

Chronic kidney disease (CKD) is a significant complication that contributes to diabetes-related mortality in the United States, and there is growing evidence that sodium-glucose cotransporter 2 inhibitors (SGLT2i) can slow its progression. However, observational studies may suffer from confounding by indication, where patient characteristics and disease severity influence the decision to prescribe SGLT2i. This study utilized electronic health records of individuals with diabetes (from TriNetX) to investigate the effectiveness of SGLT2i on CKD progression. The database provided detailed information on patients’ CKD status, demographics, diagnosis, procedures, and medications, along with corresponding dates of diagnosis and prescription. The study comprised of …

Essays On Behavioral Decision Making In Crowdfunding Environments, Bright Frimpong

Theses and Dissertations

Crowdfunding has revolutionized the world of financing. From entrepreneurs to financially excluded individuals seeking funding for essential projects, crowdfunding provides an expansive platform for project founders to raise needed capital for pending or ongoing projects. In addition to raising capital, founders also use crowdfunding to test market an idea, gain exposure for future funding, gain validation, and build trusting relationships with backers (Zhou et al., 2018). However, the success of crowdfunding is dependent on crowd participation- backer support and funding. The importance of crowd participation in crowdfunding is not limited to project funding, but also building public involvement and support …

An Examination Of Factors Impacting Student Decisions To Engage In Physical Activity At A Hispanic-Serving Institution, Glenn R. Gray

Theses and Dissertations

College students at a large south Texas university have proven consistently that they have a higher-than-average Body Mass Index (BMI), spend less time per week engaged in physical activity, and in general feel that they are less healthy than students in a national cross-sectional survey of college students by the American College Health Association (ACHA, 2021). This project investigates the barriers to activity and the motivators to engage in activity. In this cross-sectional study, the Exercise Motivations Inventory-2 and the Barriers to Being Active instruments along with a demographic survey have identified motivators and barriers. The collection of basic demographic …

Understanding The Developmental Regulation Of Opa1 Processing In C2c12 Myoblasts, Harpreet Kaur

Theses and Dissertations

Mitochondria is an energy-producing organelle in the cell that accept electrons from the Krebs cycle to generate energy in the form of ATP by oxidative phosphorylation. Two mitochondrial aspects, bioenergetics and dynamics are critical for energy balance and cellular stress responses. Mitochondrial dynamics refers to the balance between mitochondrial fusion (mitochondrial biogenesis) and mitochondrial fission (mitochondrial fragmentation). Cellular stress conditions that lead to dissipation of transmembrane potential (Δψm) trigger the activation of an IMM protein, OMA1, a metalloprotease that leads to processing of another IMM protein, optic atrophy-1 (OPA1) that mediates IMM fusion. Persistent stress primes the mitochondria to mitophagy …

From “Cowardice” To “Shellshock”: The Definition And Treatment Of Mental Health In The United States Marine Corps During The Age Of The Great War, Itzel Marquez

Theses and Dissertations

The aim of my master’s thesis is to study how the United States’ Marine Corps recognized, defined, and treated mental health issues during the Great War and how this translated into the treatment of Marines by their peers and commanding officers. Similar to other countries that fought in the Great War, also referred to as World War I, the United States witnessed intense discussions about the psychological effects of war. The question of whether and how modern warfare affected troops’ mental health was addressed by all branches of the United States’ military. Yet, the issue of mental health in the …

Effects Of Missing Data Imputation Methods On Univariate Time Series Forecasting With Arima And Lstm, Nicholas Niako

Theses and Dissertations

Missing data are common in real-life studies and missing observations within the univariate time series cause analytical problems in the flow of the analysis. Imputation of missing values is an inevitable step in the analysis of every incomplete univariate time series data. The reviewed literature has shown that the focus of existing studies is on comparing the distribution of imputed data. There is a gap of knowledge on how different imputation methods for univariate time series data affect the fit and prediction performance of time series models. In this work, we evaluated the predictive performance of autoregressive integrated moving average …

An Exploration Of Online Doctoral Students And The Ways They Cultivate Connections, Shannon Reynolds

Theses and Dissertations

According to the United States Department of Education, 42.4% of postbaccalaureate students participated in online distance education during Fall of 2019. These numbers increased because of the Covid-19 pandemic of March 2020. The pandemic not only created a severe social and economic disruption, but it also disrupted all levels of education. This study examines exclusively online students enrolled with traditional face-to-face students and faculty. Understanding the impact of the pandemic, faculty and administrators can gain insights into how online learning can be adapted to meet the unique needs of advanced learners. The pandemic has forced many universities to move their …

Problems In Algorithmic Self-Assembly And A Genetic Approach To Patterns, Andrew Rodriguez

Theses and Dissertations

As it becomes increasingly harder to make transistors smaller, replacements for traditional silicon computers become sought after. To study the computing power of these potential computers, various theoretical models have been proposed, such as the abstract Tile Assembly Model (aTAM) and chemical reaction networks (CRNs). This thesis compiles research in various models such as the aTAM, Tile Automata, and CRNs. This work shows an investigation of covert computation in the aTAM and an evolutionary algorithm to approximate solutions to the pattern self-assembly tile set synthesis (PATS) problem. Next, optimal state complexity for building squares in Tile Automata is shown along …

Disaster Risk Perception, Climate Change Awareness, And Disaster Preparedness Among University Of Texas Rio Grande Valley Students, Anandita Roy

Theses and Dissertations

University students are usually young and have low-income resources, live in dormitories or low-rent housing near the university, and have little to no disaster experience. Therefore, they are vulnerable to disasters due to a lack of resources for preparation. To better understand the vulnerability of students to disasters, the study aims to assess the perceptions of disaster risk, climate change awareness, and the level of disaster preparedness of students at the University of Texas Rio Grande Valley (UTRGV). In this study, we collected data from 320 students who participated in an online survey. The study’s findings provide an understanding of …

The Synthesis And Characterization Of Metal Oxide Nanomaterial-Based Composites And Their Use As Antibacterial Agents, Jo A. Sanchez

Theses and Dissertations

The work presented in this thesis discusses the antibacterial properties of various metal oxides and metal oxide/polymer composite fibers. Polyvinylpyrrolidone (PVP) fibers embedded with Zinc Oxide nanoparticles (ZnO NPs) were prepared by centrifugal spinning from PVP aqueous solutions) and ZnO NPs. The ZnO NPs were synthesized and coated with different surfactants, cetyltrimethylammonium bromide (CTAB) and hexadecyltrimethylammonium bromide (HTAB). The effect of surfactant coating on the antibacterial activity of ZnO NPs and PVP/ZnO nanocomposite fibers against escherichia coli (e. coli) and bacillus megaterium (b. megaterium) bacteria was systematically investigated. The results showed that coating the ZnO NPs …

How Can Increased Parental Involvement Facilitate Greater Student Engagement And Academic Success Within One Rgv Middle School, Jaime H. Serna

Theses and Dissertations

The purpose of this study is to explore how can increased parental involvement be encouraged in the K-12 school in the Rio Grande Valley in order to facilitate greater student engagement and academic success. An action research project will be done to explore middle school teachers’ perspectives on parental involvement and the effect it has on student academics. Research will take place in Sunview Middle School were interviews, observations will be conducted to teachers, parental involvement assistant and administrator. Data will assist to improve and promote the parental involvement program to assist all stakeholders and better assist our students.

A Descriptive Case Study Of Students’ Lived Experiences In A Dyslexia Lab – Before, During, And After The Covid-19 Pandemic, Gladys M. Suarez

Theses and Dissertations

The purpose of this study is to investigate the lived experiences of three students who have received Structured Literacy instruction in a Dyslexia Lab while delivered through remote learning or face-to-face. It addresses the following question: In a Dyslexia Lab where teachers have used Structured Literacy in both virtual and face-to-face environments, what are students’ experiences? To better understand the experiences, I draw on the conceptual framework of individual student development through theoretical perspectives. The Bronfenbrenner’s Ecological Systems Theory was utilized to conceptualize this case study. This theory helped analyze the data, guide the research, and evaluate the findings. Data …

Artistic, Artworld, And Aesthetic Disobedience, Adam Burgos, Sheila Lintott

Faculty Journal Articles

Jonathan Neufeld proposes a concept of aesthetic disobedience that parallels the political concept of civil disobedience articulated by John Rawls in A Theory of Justice. The artistic transgressions he calls aesthetic disobedience are distinctive in being public and deliberative in their aim to bring about specific changes in accepted artworld norms. We argue that Neufeld has offered us valuable insight into the dynamic and potent nature of art and the artworld; however, we contend that Neufeld errs by constraining aesthetic disobedience to the artworld. Through a reconsideration of the parallel between aesthetic and civil disobedience, we illustrate how aesthetic disobedience …