Digital Commons Network^™

Has Electricity Deregulation Eliminated The Nuclear Option?: Rethinking The Coasian Ios For Project-Finance Investments, Stephen Dansky

Theses and Dissertations

Installed electric generation capacity in the United States is expected to grow significantly over the next two decades. This raises concern about climate change as several common methods of electricity generation emit greenhouse gases. Nuclear power, which doesn’t create greenhouse gases while generating electricity, has been heavily promoted by the nuclear industry and a segment of the environmental community ever since it was codified by the United Nation’s 26^th Climate Change Conference of the Parties as an acceptable energy source to fight climate change. However, this dissertation establishes that the increased revenue risk and uncertainty created by the deregulation …

Deep Learning In Indus Valley Script Digitization, Deva Munikanta Reddy Atturu

Theses and Dissertations

This research introduces ASR-net(Ancient Script Recognition), a groundbreaking system that automatically digitizes ancient Indus seals by converting them into coded text, similar to Optical Character Recognition for modern languages. ASR-net, with an 95% success rate in identifying individual symbols, aims to address the crucial need for automated techniques in deciphering the enigmatic Indus script. Initially Yolov3 is utilized to create the bounding boxes around each graphemes present in the Indus Valley Seal. In addition to that we created M-net(Mahadevan) model to encode the graphemes. Beyond digitization, the paper proposes a new research challenge called the Motif Identification Problem (MIP) related …

The Role Of Self In Self-Control Dilemmas: Self-Concept, Conflict, And Self-Conscious Emotions, Jasmina (Mina) Milosevic

Theses and Dissertations

Self-control dilemmas, typically defined as an internal conflict between short-term allurements and long-term goals, are a common feature of everyday life. How such dilemmas are handled is often viewed as a measure of one’s self-control, thus carrying significant implications for an individual. Despite a large body of research that has been amassed on this topic, a complete picture of how self-control dilemmas are processed and resolved still eludes us. In the present research, we bring attention to a largely unexplored aspect of self-control, the role of self-concept in shaping self-control efforts. We combined surveys, hypothetical scenarios, and experience sampling data …

The Effect Of Weather On Atc Complexity And Traffic Volume In Washington Air Route Traffic Control Center (Zdc) High Sectors, Amber Mccraw

Theses and Dissertations

The purpose of this study was to investigate the effect of weather on ATC complexity and traffic volume in ZDC high sectors in clear vs. convective weather using the AS&T Complexity Tool. This relationship was examined from a combined sector and individual sector perspective using both raw data and daily means for ATC complexity and traffic volume. This study employed an ex post facto effects-type design that used flight trajectory data from the FAA’s System-Wide Information Management (SWIM) Flight Data Publication Service (SFDPS) and weather data from NOAA spanning the year of 2019.

The primary analysis involved raw ATC complexity …

Genetics Of Lrg1 And Its Association With The Cardiometabolic Risk Traits In Mexican American Children And Adolescents, Aaron Rene Reyna

Theses and Dissertations

Leucine-rich alpha-2-glycoprotein 1 (LRG1) has become a major topic of research due to an increasing number of studies demonstrating its unique role in the pathogenesis of multiple human diseases including diabetes and cardiovascular disease. LRG1 has recently been identified as an adipokine, a signaling molecule secreted by adipose tissue. Furthermore, it has been correlated with intercellular signaling that promotes diet-induced hepatosteatosis and insulin resistance in mice. In this study, LRG1 serum concentrations were measured in a family-based cohort of 571 non-diabetic Mexican American children and adolescents aged 6-17 years old (mean age = 11.76 years and females = 48.2%) to …

Foxo4 Impacts Akt In Glioblastoma Multiforme, David Uribe

Theses and Dissertations

Glioblastoma Multiforme (GBM) is an aggressive cancer with patients surviving 13 months on average after diagnosis. The PI3K-PKB/AKT pathway is conserved from flies to mammals. The PI3K signaling pathway aids in the growth and survival of tumor cells. Forkhead box transcription factors subclass O (FOXO1, FOXO3, and FOXO4) act as tumor suppressors in some contexts. In GBM, our group and others showed that FOXO transcription factors drive stem gene expression to promote growth and survival. We disrupted the FOXO4 gene in U87MG cells using CRISPR Cas9 genome editing and performed RNA-seq to identify targets of this …

Development And Application Of Environmental Dna (Edna) Techniques To Detect Rough-Footed And Yellow Mud Turtles: A Seasonal Field Study To Detect Turtle Edna, Sakib Tahmid Rishan

Theses and Dissertations

The application of environmental DNA (eDNA) has improved the ability of humans to detect the existence and geographical distribution of aquatic organisms. The present study highlights the development and application of eDNA techniques to detect rough-footed mud turtles and yellow mud turtles in different areas in Texas. Both mud turtle species were successfully detected in lakes/resacas using direct eDNA sampling techniques. Moreover, passive eDNA sampling techniques were conducted using different membrane filters to detect mud turtle species. The findings indicated that only the mixed cellulose esters (MCE) filter membranes effectively identified eDNA of yellow mud turtles in the fall, but …

Utilizing Nanodiamond For Antiretroviral Drug Delivery To Hiv Infected Microglial Cells, Ebenezer Owusu

Theses and Dissertations

Combination antiretroviral therapy (cART) is widely used to treat HIV infection, but it fails to eradicate viral reservoirs, such as microglia in the brain, leading to HIV-associated neurological disorders (HAND). Advances in nanomedicine have enabled the development of targeted drug delivery systems, and nanodiamonds (NDs) and fluorescent nanodiamonds (FNDs) have emerged as a potential solution due to their biocompatibility, non-toxic nature, and efficiency as drug carriers. Our study builds on previous findings that NDs can cross the blood-brain barrier (BBB), aiming to utilize NDs and FNDs for their added traceability. We propose a multifunctional nanodrug platform that leverages NDs and …

Effects Of Nitrogen Or Phosphorus Depletion On Lipid Production In Bracteacoccus Sp. And Tetrastrum Sp., Cassandra J. Po

Theses and Dissertations

As global energy demands have risen in the past decades, various species of microalgae have been chosen and used as sources of lipids for third-generation biofuel. I selected two species of green microalgae, Bracteacoccus sp. and Tetrastrum sp., from isolates from South Texas to determine their potential as sources of biofuel. For comparison, Chlamydomonas reinhardtii was used as a model organism. To evaluate lipid productivity under different nutrient regimens, the microalgae were grown in nutrient-replete growth media until the population had reached the end of the logarithmic phase (roughly 14 days), and then transferred into growth media depleted of nitrogen …

Development Of A More Sustainable High And Ultra-High-Performance Concrete, Enrique Chirino Andalco

Theses and Dissertations

The urgent need to address climate change and environmental damage presents humanity with significant challenges that must be tackled quickly, not acting promptly will result in irreversible consequences, such as extreme weather events, public health risks, and water shortages, among other impacts.

Due to its enormous size and variety of uses, the construction industry is a key factor in addressing the climate challenge. Specifically, concrete as the most used construction material in the world is a good target for developing innovative and Sustainable improvements to reduce environmental impacts.

Using by-products from other industries in concrete manufacturing is a common and …

Care-Teach: Proposing An Open-Source Approach To Personalized Learning, Jaime Augusto Alvarez Perez

Theses and Dissertations

Care-Teach is an algorithmic educational model that provides teachers and educators with the tools to create interactive, text-based lessons that address a student’s need for continuity and reinforcement. Care-Teach is built around two core components: a Student Behavior Profile and the Skill Tree. These models work together to give each student a personalized learning experience that reinforces their pre-existing strengths and inclinations. The Student Behavior Profile model keeps track of a learner’s inclinations and mood, utilizing metrics such as average response time and accuracy to categorize opportunities for educator involvement. The Skill Tree is an organizational …

Electrocatalytic Degradation Of Bisphenol A Using Nickel Sulfide Supported On Graphene Oxide And Cobalt Sulfide Supported On Graphene Oxide Composite Materials, Katherine Ellynn Wright

Theses and Dissertations

The degradation of bisphenol A (BPA) by nickel sulfide supported on graphene oxide (NiS/GO) and cobalt sulfide supported on graphene oxide (CoS/GO) composite materials was investigated. The catalysts were studied to determine the optimal conditions for BPA degradation using electrocatalysis. Electrocatalytic trials were performed using varying parameters, which included electrolyte concentrations of 1.0 g/L, 2.0 g/L, and 4.0 g/L Na2SO4, pHs of 2, 4, and 6, and constant currents of either 0.100 A or 0.200 A. During the reaction samples were taken before the current was applied and 30 minutes and 60 minute intervals to observe the degradation of …

Role Of Interferon-Induced Protein With Tetratricopeptide Repeats 3 (Ifit3) In Hiv-1 Associated Neurodegenerative Disorder And Alzheimer’S Disease, Ranjit Kumar Das

Theses and Dissertations

The advent of cART has revolutionized the management of HIV-1 infection and saved the lives of millions of people worldwide. Yet, HAND continues to be clinically relevant with aging people with HIV-1 (PWH). The underlying mechanism of HAND remains poorly understood. In this regard. Signal transducer and activator of transcription 1(STAT1) and IFIT3 genes have been shown to induce neuroinflammation and neuronal cell death. However, the role of IFIT3 in HAND pathology has not been well established. Therefore, the present work investigated the significant role of IFIT3 gene in development of HAND. In the current study, …

The Impact Of Culture On Firm Performance: A Study On The Effect Of Respect, Teamwork, Innovation, Quality And Integrity On Corporate Profitability, Raphael Mwangi Wambugu

Theses and Dissertations

This thesis investigates the intricate relationship between organizational culture and firm performance, focusing on specific cultural dimensions of respect, teamwork, innovation, quality, and integrity as possible determinants of firm performance. The main objective is to find out the impact of these cultural elements on the dependent variable, return on assets (ROA).

As organizations strive for sustained success and competitive advantage, understanding the interplay between culture and financial performance becomes important. The cultural variable of respect is examined as a catalyst for fostering diverse perspectives and collaborative interactions within the organization. Teamwork is analyzed for …

Machine Learning Predictive Models For Load Identification Of Railroad Bridges Subjected To Train-Induced Vibration, Md Masnun Rahman

Theses and Dissertations

The U.S. rail network is among the world's largest, safest, and most efficient. However, many its railway bridges, which play an essential role in its connectivity, are over 100 years old, showing signs of structural deterioration exceeding their practical service life. The increased weight and speed of modern trains also pose a risk to these bridges. Traditional load identification and monitoring technologies like Weigh-in-Motion (WIM) systems are rarely used on railway bridges due to their cost and practical limits. This thesis explores a cost-effective approach to utilize vibration sensors on railway bridges to identify and predict train load features (speed …

Numerical Study Of New Tuned Mass Friction Damper For Seismic Protection Of Civil Structures, Syed Muhammad Bilal Haider

Theses and Dissertations

Tuned Mass Friction Dampers (TMFDs) are passive control systems designed to mitigate vibrations in civil structures subjected to extreme lateral forces such as windstorms and earthquakes. The objective of this thesis is to propose a new TMFDs with enhanced energy dissipation capability for seismic protection of multi-story frame buildings. This new TMFD is termed as “Tuned Mass Multi-Sliding Friction Damper” (TMMSFD) consisting of multiple masses connected to the primary structure through linear springs and while sliding relative to each other at multiple sliding surfaces. TMMSFD offers an improved damping mechanism with reduced stick-slip motion effects compared to standard TMFDs which …

Cultural Norms And The Expression Of Affection In Nigerian Yoruba Families, Tolulope G. Banjo

Theses and Dissertations

Affectionate behaviors have biological and physiological implications for humans. Affectionate communication encompasses behaviors that convey affection to the senders and receivers. The purpose of this qualitative study was to investigate the role of culture and cultural traditions in the expression of affectionate behaviors among members of the Nigerian Yoruba family. Two focus groups were conducted in which participants (18-39 years of age) identified the affectionate behaviors they use in their families. Participants also shared how they perceived their culture playing a role in their affectionate communication. The findings revealed 18 categories of affectionate behaviors used by Nigerian Yoruba …

Corre Y Se Va: A Collection Of Ramblings, Daniella Arredondo

Theses and Dissertations

This thesis explores womanhood, death, and life writings. Through various pieces of nonfiction writings and poetic writings, this thesis reacts to each theme by making a personal connection to certain moments in the narrator’s life. From the Me-Too moment to a tonsil removal, the narrator situates the thesis as a reactive piece to works like “Borderlands/La Frontera” by Gloria Anzaldúa, nonfiction works, like Chanel Miller’s “Know My Name,” and various news articles around events that relate to each theme. The selections of the themes stem from Loteria, a popular bingo-like game within Hispanic culture. The use of these images creates …

In Absentia, Noreen M. Graf

Theses and Dissertations

In Absentia is a collection of short creative pieces that includes short stories, flash fiction, essay, and comics. The critical introduction aims to place my work into the ongoing dialog surrounding the accelerated portrayal of unlikable female protagonists in contemporary literary fiction.

Model-Based And Model-Free Control Approaches In Subgrids: A Conceptual Review Of Control Strategies In Microgrids, Omobolade H. Abioye

Theses and Dissertations

Increased reliance on the power grid and concerns over climate change issues have resulted in the rapid adoption of renewable energy technologies. Consequently, it is necessary to consider how renewable energy resources are combined and controlled. The microgrid serves as the control center for distributed energy resources. This thesis paper introduces the microgrid elements and framework, its control strategies highlighting frequency and voltage control, and the prospects of artificial intelligence for control, considering two significant approaches. Key components of sub grids like the energy management system (EMS) and energy storage systems (ESSs) are discussed, and lastly, the …

Particle Swarm Optimization For Training Quadrotor Pid Controller, Eric Xavier Rodriguez

Theses and Dissertations

The objective of this research is to establish a fundamental approach to tuning PID (Proportional-Integral-Derivative) parameters for a simulated quadrotor drone. Implementing a PID controller for autonomous flight provides a straightforward and efficient method for monitoring and correcting robotic movement based on the robot's current state. However, applying a PID approach to a quadrotor's flight controller poses challenges, such as assigning multiple parameters to control an inherently under-actuated system. This includes the need to find optimal parameter values that reduce the likelihood of large overshoots and lengthy adjustment times. Ineffectively tuning PID parameters can have detrimental effects on autonomously …

The Impracticality Of Silk, Jo A. Reyes

Theses and Dissertations

In the impracticality of silk, the author examines and critiques the world through poetry and prose poetry, specifically addressing gender, sexuality, relationships, the borderlands, and canonized art as they view it to foment a new understanding and voice during a time of societal and personal shifts. Further complicating the author’s understanding are questions around desire both within reclaimed sensuality and within Audre Lorde’s larger understanding of desire as foundational and necessary in creation and liberation, and Gloria E. Anzaldúa’s use of autohistoria-teoria and her work within borderlands as ways toward reevaluating and reclaiming identity and place in the larger world. …

Developing Resilient Defense Strategies Against Pheromone-Based Attacks In Foraging Robot Swarms, Ryan A. Luna

Theses and Dissertations

This thesis delves into the security of stochastic pheromone-based foraging algorithms within swarm robotic systems, a subset of foraging algorithms distinguished by their reliance on probabilistic decision-making mechanisms inspired by the natural world. Such algorithms face vulnerabilities in stigmergic communication that threaten to disrupt swarm operations. This research investigates these vulnerabilities, presenting two distinct contributions.

The first contribution examines the implementation of quarantine strategies as a defensive measure to isolate and mitigate the impact of fake resource attacks. By simulating these attacks, this study quantitatively assesses their detrimental effects on swarm efficiency and explores the efficacy …

Rsm For The Optimization Of Selective Laser Melting Process Parameters For Manufacturing Initial Layers Of Horizontal Overhang Structures, Prince Yaw Asamani

Theses and Dissertations

While prevalent in 3D printed objects, overhang features are difficult to print with selective laser melting due to the limitation of a purely vertical laser. To address this issue, overhang features are typically built on temporary supports, which are removed following printing. However, this results in wasted material and longer production time. Several authors have studied printing overhangs without support structures. However, there has not been a systematic approach to studying the effect of multiple process parameters on the quality of a printed overhang. This thesis investigates the effect of laser power, scanning speed, and hatch distance on the surface …

A Phenomenological Study Of Latina Poets As Leaders At Higher Education Institutions, Rodney Gomez

Theses and Dissertations

This interpretive phenomenological study addresses the underrepresentation of Latinas in higher education leadership roles by focusing on the lived experiences of Latina poets who have served as higher education leaders. Data, collected through semi-structured participant interviews and participant writing samples, was analyzed through a standard method of thematic analysis. Latin American and U.S. theories of decoloniality and Yosso’s community cultural capital guided interpretation of participant experiences. Five themes emerged from the analysis: border negation, foundational values, othered leadership, importance of community, and writing as necessity. Discussion of participation experiences suggests that ways that poetry and creative writing can be used …

At Risk, Punished, And Pushed Out Of School: Leadership Practices Utilized By School Administrators For Discipline Consequences In South Texas Schools, Beulah San Juanita Rangel

Theses and Dissertations

The purpose of this study was to examine leadership practices utilized by school administrators for discretionary discipline consequences that feed the school-to-prison pipeline. The researcher utilized a hermeneutic phenomenological approach to investigate factors that influence campus administrators’ decision to use of exclusionary discipline through a series of semi-structured interviews. Through data analysis, three themes emerged: (1) Principals’ Impact on Student Discipline (2) Principals’ Considerations Before Using Exclusionary Discipline (3) Principals Lack of Training.

Teachers’ Perceptions Of Their Principals’ Leadership Attributes In A Lower Rio Grande Valley (Rgv) School District And The Influence On Their Leaders’ Attributes To Their Self-Efficacy, Arely Rios Tamez

Theses and Dissertations

The purpose of this non-experimental quantitative study is to obtain middle school teachers’ perceptions of their principals’ leadership attributes and analyze how their perceptions of those leadership attributes relate to their sense of self-efficacy. Teacher participants from five middle schools in a lower Rio Grande Valley (RGV) school district in South Texas will be asked to complete two surveys: one survey based on their perceptions of their principals’ leadership attributes (TPPAQ) and another survey measuring teacher efficacy (TEBS-Self). Data analysis using multiple regression will examine if there is a relationship between teacher perceived school leadership attributes of their principals and …

Bayesian Estimation Of Reproduction Numbers From Distributions Of Outbreaks Sizes: Branching Process Approach, Alberta Araba Johnson

Theses and Dissertations

The Generalized Poisson distribution is useful in modeling epidemiological processes as a branching stochastic processes problem. Our goal is to construct accurate and reliable estimators for the reproduction number (R0) (i.e., the number of secondary infections), particularly in the context of disease outbreaks modeled by a Galton-Watson process. Towards this goal, we construct the classical Bayes estimator, the Maximum Likelihood estimator, and the Empirical Bayes (EB) estimator under the Square Error Loss function in Chapter II. We prove that the Empirical Bayes estimator is asymptotically optimal and estimate the rate of convergence. We then proceed to monotonize the Empirical Bayes …

A Dedicated Lane Analysis For Supply Chain Resilience In The U.S.-Mexico Border: Cost-Comparison And Simulation Models, Carlo A. Zorola Gonzalez

Theses and Dissertations

Supply chains have been actively developing and implementing strategies to enhance resilience in response to various disruptive events like the COVID-19 pandemic, hurricanes, geopolitical tensions, and climate change. These strategies aim to address demand and supply imbalances, logistical challenges, and policy restrictions encountered in transborder commerce. One area significantly impacted by such disruptions is cross-border trade between the US and Mexico. Understanding these strategies is crucial for achieving supply chain resilience, defined as the ability of a supply chain to quickly adapt to sudden disruptions without affecting the flow of goods. In both the US-Mexico and US-Canada borders …

An Investigation Into The Enoughness Mindset, Ai Nhan Thi Ngo

Theses and Dissertations

The concept of enoughness was an old but forgotten concept in human history. This research reintroduced the concept to our contemporary culture as a means to deal with consumers' endless desires by exploring the enoughness concept. Contemporarily suppressed under the development of modern capitalism, an extensive mythological trace of the enoughness concept showed its existence through more than 25 centuries across cultures with four key components: reining in desires, knowing contentment, knowing when to stop, and consideration of harmony. Building upon theories of desires, this research positioned enoughness as a means to help tame consumers' endless desires that can be …