Digital Commons Network^™

Survival, Biofilm Formation, And Control Of Foodborne Pathogens In Hydroponic Systems, Sai Rithin Reddy Kothur Thirupathi

Theses and Dissertations

The growing global population and increasingly unpredictable weather patterns have intensified the demand for sustainable food production methods. Hydroponics, a form of Controlled Environment Agriculture (CEA), has gained attention as a viable solution due to its efficient use of resources such as land and water. Although hydroponic systems are perceived as safer alternatives to conventional farming, recent foodborne outbreaks associated with these systems have raised significant public health concerns. This thesis research investigated the food safety risk in hydroponic, particularly the survival and persistence of foodborne pathogens. Chapters I and II provide a comprehensive overview of hydroponics and the microbial …

Unveiling Perspectives: Young Adults Banned Books Critical Content Analysis, Tiffany Ladonna Jarebica

Theses and Dissertations

This dissertation conducts a critical content analysis of seven banned young adult novels—All Boys Aren’t Blue, All the Things We Do in the Dark, Almost Perfect, Ask the Passengers, The Bluest Eyes, The Hate U Give, and The Kite Runner—within one Texas school district. Using intersectionality theory as a lens, the study explores how intersecting identities such as race, gender, sexuality, and trauma are portrayed in these narratives and examines the role these portrayals play in the censorship process. The analysis investigates the socio-cultural, political, and institutional factors that influenced the removal of these texts, considering how their …

Implementing And Evaluating An Ai-Powered Visual Decision Support System To Improve Antibiotic Usage Among Physicians With A Built-In Early Warning System, Akua Sekyiwaa Osei-Nkwantabisa

Theses and Dissertations

The widespread misuse and excessive prescription of antibiotics have played a pivotal role in the emergence and proliferation of antibiotic-resistant bacteria, posing a critical global public health crisis. Addressing this challenge necessitates innovative solutions that enhance antimicrobial stewardship. This study presents the development and implementation of a visual decision support system designed to monitor and optimize antibiotic usage among healthcare providers. The proposed system integrates advanced machine learning algorithms with real-time data analytics to provide a dynamic, evidence-based decision support tool. Specifically, a neural network model was developed after evaluating multiple machine learning approaches, including Random Forest, Logistic Regression and …

Evaluating The Impact Of Reflex Math On Mathematics Achievement In Elementary Schools: A Quasi-Experimental Study In South Texas, Kasey Juarez

Theses and Dissertations

This quantitative, quasi-experimental study examined the impact of Reflex Math, a gamebased instructional program focused on building math fact automaticity, on the achievement of Grade 3-5 students in a South Texas public school district. The study compared a 2023 intervention group that used the program from August to December with a 2022 comparison group that did not. The intervention’s effectiveness varied by grade level, with Grade 3 students showing the most positive gains, no significant effect in Grade 4, and a slight negative difference in Grade 5. Results showed statistically significant, though modest, gains in mathematics achievement among students who …

Other Others At The Border: An Autoethnographic Inquiry, Clover Johnson

Theses and Dissertations

This dissertation critically examines the concept of multiple otherness in online learning environments in Hispanic Serving Institutions. Hispanic Serving Institutions may unintentionally perpetuate practices and curricula that exclude and decenter the needs of older, disabled, or geographically diverse black women who may not identify within the university’s focus. Despite their missions to servingness of a stated population, Hispanic serving institutions must examine existing curricula that primarily cater to the dominant minority group they have tasked themselves to serve. By investigating existing curricular practices, this research seeks to maintain the integrity of minority-serving institutions while encouraging inclusivity for all students. By …

Family-Centered Organization Creating “Lazos” To Affix Families And Their Students To Education: A Case Study, Erica Gonzalez

Theses and Dissertations

Historically, parental involvement has alternatively shifted from being a central participant within the United States’ education reform to being a secondary input stakeholder primarily due to the constant attempts to align its purpose, presence, and effects in education initiatives. Additionally, the varied constructs considered by multiple researchers and federal or state education agencies to define ‘parental involvement’, the variety of ‘population descriptors’, and ‘types of communication’ have increased the complexity to address the needs diverse family structures have to successfully build “lazos” to affix themselves and their students to education. This case study explores the perspectives low socioeconomic Hispanic families …

Perceptions Of Special Education Teachers On The Transition Planning Process: Examining Practices That Predict A Positive Post-Secondary Outcome For Students With Disabilities In The Lower Rio Grande Valley School Districts, Mayra Lorena Martinez

Theses and Dissertations

This study explored the significance of the transition planning process for students with disabilities, particularly from the perspectives of the special education teachers. Grounded in Social Cognitive Career Theory (SCCT), this research examined the role of the student, parent, work related experiences and teacher involvement in the transition process, and the relationship between these factors and College, Career, and Military Readiness (CCMR) measures. Using a quantitative approach, that included special education teachers’ responses to the Secondary Education Transition Questionnaire adapted version and a cross analysis with 2022-2023 Texas Academic Performance Report (TAPR) CCMR indicators, the study identified critical gaps between …

Exploring Secondary Content And Career And Technical Education (Cte) Teacher Self-Efficacy In Supporting The Literacy Needs Of Long-Termed Emergent Bilinguals: A Mixed-Methods Inquiry, Jennifer Louise Burden

Theses and Dissertations

This dissertation employed a mixed-methods convergent design, incorporating survey data and semi-structured interviews to investigate the self-efficacy of high school teachers in content areas and Career and Technical Education (CTE) towards their perceived abilities to support emergent bilingual students, particularly in content-specific literacy.

Grounded in the theoretical frameworks of Bandura's (1977) self-efficacy theory and Dweck's (2008) growth mindset, this study explores how educators' perceptions of their abilities impact their instructional practices and student outcomes.

Findings reveal a need for more training and resources to increase student engagement, which impacts academic outcomes and attendance and calls for comprehensive reforms in teacher …

¿Puedo Decirlo En Español?: Teacher Views On Utilizing Translanguaging Pedagogies To Bridge The Language Gap In Secondary Classrooms, Luis Carlos Bocanegra

Theses and Dissertations

Translanguaging disrupts the notion of language as a fixed, separate system, offering a deeper insight into how individuals fluidly navigate and construct meaning across linguistic boundaries. This research study uses narrative research and participatory action research to employ translanguaging as a pedagogical framework to create inclusive spaces where emergent bilinguals could fully utilize their linguistic repertoire in secondary schools in the borderlands of the Rio Grande Vally in deep South Texas.

The findings of this study are organized into two overarching themes: cultural relevance and inclusivity in borderland schools, which brings to light the importance of culture, inclusivity, and supportive …

A Comparative Study Of Urban And Natural Nesting Gray Hawks In The Lower Rio Grande Valley Of South Texas, Evan Farese

Theses and Dissertations

Urbanization can negatively impact birds of prey, which occupy higher trophic levels. The Gray Hawk (Buteo plagiatus) is a neotropical raptor inhabiting the Lower Rio Grande Valley (LRGV) of Texas, where it is threatened. The species’ ecology has been little studied and it is unclear how urbanization may affect population viability. I studied Gray Hawk reproductive success, diet, and thermal ecology at nests in urban and natural habitats in the LRGV. Camera trap data showed adults at urban nests delivered mostly avian prey, while mammalian prey was most frequently brought to natural nests. Data from temperature loggers showed …

Early Breast Cancer Detection With Ultrasound Data Using Nmf, Rutvi Khamar

Theses and Dissertations

Early detection of breast cancer significantly influences patient outcomes. Dynamic Contrast-Enhanced Ultrasound (DCE-US) has shown promise in early detection by visualizing tumor vascularity and perfusion dynamics in real-time. This study evaluates the efficacy of DCE-US in distinguishing four stages of cancer progression: normal, hyperplasia, ductal carcinoma in situ (DCIS), and invasive cancer, using a transgenic mouse model that mimics human breast cancer. Ultrasound burst pulses, while commonly used to remove unbound contrast agents, can potentially damage human tissues. Using the pre-pulse data helps mitigate this risk, ensuring safer and more reliable measurements. A VEGFR2-targeted microbubble contrast agent was injected, and …

Blink-Related Brainwaves As Digital Biomarkers For Cognition Assessment During Complex Tasks, Lexine Carmlixa Sibert-Jolissaint

Theses and Dissertations

Blink-related oscillations (BROs) are neurophysiological responses observed in electroencephalography (EEG) following spontaneous blinking, reflecting the brain processing of new visual information. Prior research has demonstrated BRO responses across various cognitive states, such as resting, cognitive loading, and sensory stimulation, highlighting their potential as a non-invasive biomarker of brain function. We conducted the first investigation of BRO responses during a verbal fluency (VF) task, which is a complex, dynamic task state combining memory, visual perception, executive function, and language processing. Using publicly available EEG data from 22 healthy adults, we measured BRO responses over the left anterior frontal region corresponding to …

Tracing Wave Induced Flow Field Surrounding Reef Balls, Alexis Scheele

Theses and Dissertations

This study aims to explore the wave-induced flow dynamics around Reef Ball models using dye tracing techniques. Reef Balls are hemispherical artificial reefs with a hollow center and cavities throughout each face, they are designed in this manner to enhance coral reef restoration. Reef Balls rely on wave energy and current motion to facilitate water circulation and nutrient exchange within and surrounding their structure. To understand how wave action influences flow patterns around these artificial reefs, a scaled model experiment was designed to simulate real-world conditions. The experiments were conducted in the wave flume at Florida Institute of Technology’s Surf …

Transcription Factor Y- Box Binding Protein 1 (Ybx1) Enhances Sorafenib Resistance And Tumorigenic Capacities In Hepatocellular Carcinoma (Hcc), Dennis Kwabiah

Theses and Dissertations

Hepatocellular carcinoma (HCC) is the most common liver cancer, with early-stage cases potentially benefiting from surgical treatments like liver transplantation and hepatectomy. However, advanced HCC stages have poor prognosis due to resistance to therapies, especially sorafenib, a tyrosine kinase inhibitor approved for late-stage HCC. Despite its clinical use, sorafenib has limited efficacy in prolonging survival, and the mechanisms of resistance remain unclear. Analysis of The Cancer Genome Atlas (TCGA) HCC dataset shows elevated Y-box binding protein 1 (YBX1) expression in HCC tumors compared to normal liver tissues. Previous studies have indicated that YBX1 is involved in drug resistance in various …

#Helpplz: Mental Health Representation In Theatre For Young Audiences, Kate Elizabeth Dirrigl

Theses and Dissertations

#HELPPLZ is a play for young theater audiences that depicts four teenagers with various mental health challenges. It’s target audience is for children ages ten to fifteen and should be performed by actors of similar ages. #HELPPLZ is an immersive theatre experience, as a audience members watch four actors perform from four different lifestyles and point of views, all while broadcast on screens behind the actors. Every seat is a good seat in the house. This play follows a shift in trends of mental health depiction in contemporary theatre. No longer demonized and much more accessible, plays such as Dear …

The Effects Of Placing Students In Special Education In A Disciplinary Alternative Education Program, Daniel Garza

Theses and Dissertations

Educating students with special needs can be very challenging especially when their academic challenges are compounded with behavioral challenges. Disciplining students with special needs can create additional challenges and often the use of punishment can have little to no effect in deterring undesirable behavior. As behaviors escalate, so does the form of punishment and students with special needs are often sent to a Disciplinary Alternative Education Program. This study aimed to uncover the effects of placing students who receive special education services in a Disciplinary Alternative Education Program focusing on the impact of placements on academic outcomes and behavioral changes. …

Climate Change And The Field Of Farm Labor In The Lower Rio Grande Valley, Texas, Cody Richard Mortell

Theses and Dissertations

Farm workers in the United States are often vulnerable to adverse impacts of climate change, particularly extreme heat. This study explores farm workers’ climate change perceptions (CCP) as a mediating force in climate adaptation. Using latent class analysis, in-person survey data (n=404) from Lower Rio Grande Valley, TX (2024) and NOAA data were analyzed. Results were interpreted using Bourdieu’s field analysis framework and his notions of capital and symbolic power. Findings include: a social hierarchy with three latent classes of workers based on economic, cultural, social, and symbolic capital, which statistically significantly affected CCP. Workers in higher structural positions were …

Art And Effort, Saul Gabriel Dominguez Ii

Theses and Dissertations

Since childhood I questioned living and my life itself. I wondered the extent of our own free will since people live to cry, to hate, to think they’ve been born simply to die. I use philosophers and some contemporary fiction to portray a lens of living where we must romanticize the present, rather than an uncertain future, and remove the idea that there is a reason for our living. This method of present thinking is a characteristic of a life-well lived. The manuscript will largely be told from my point of view, a young aspiring author with limited experience, through …

Ama, Juan Gabriel Mendoza

Theses and Dissertations

This collection of interconnected testimonios - essays - follows the life of Socorro Benitez Celedon, an immigrant grandmother who spent decades laboring in the agricultural fields across the United States. After crossing the border from Mexico to Texas at the age of 12, Socorro navigates the harsh realities of migrant farm work low low-paying jobs, discrimination, segregation, and cruel realities, while nurturing dreams for her family's future. The stories shift between her early years in her small town in northern Mexico, San Jose De Raices Nuevo Leon, to her migrant life planting, picking, and harvesting fruits and vegetables, to her …

Developing A Small Molecule To Inhibit Hsf1 Expression In Cancer And Evaluating Natural Genetic Variation In Small Molecule Toxicity., Michaela Kendal Foley

Theses and Dissertations

Each year cancer affects nearly 20 million people worldwide and genetic differences across populations can impact cancer onset and progression. Specifically, tumors with high levels of HSF1, the master regulator of the cytoprotective heat shock response (HSR), are correlated with poor patient outcomes in multiple cancers such as prostate, breast, and melanoma. Subsequently, the development of pharmacological inhibitors of HSF1 represents a promising strategy for anticancer therapeutics. Using a luciferase-based transcriptional reporter, two small molecule libraries were screened for inhibitors of HSF1 expression in human embryonic kidney cells, yielding ten compounds that decrease HSF1 expression. To identify if cancer lines …

Stochastic Analysis With Operational Calculus In Reliability, Hend Hamdan Al-Jahani

Theses and Dissertations

Our dissertation models several reliability systems subject to occasional random shocks of random magnitudes W1,W2,..occurring at times tau0, tau2,..In Model 1, the underlying system becomes inoperational if it wears out due to aging specified by a monotone increasing continuous function Delta identifying system's wear at any time t>=0 . The system is deemed inoperational if delta crosses a sustainability threshold at some moment T=(delta )^-1(D). The precise time T is difficult to identify making the realistic failure time randomly delayed and thus identified at some opportune observation epoch. The system can also fail due to damages by external shocks, …

Trends In And Factors Associated With Science Achievement Among Fourth Graders In Saudi Arabia: A Secondary Analysis Of Timss Data, Reda Massawe

Theses and Dissertations

This secondary analysis examined trends and factors associated with science achievement among fourth-grade students in Saudi Arabia using data from the Trends in International Mathematics and Science Study (TIMSS). Between 2007 and 2019, Saudi students consistently scored below the international average in science, with female students outperforming males by more than 30 points. The study addressed two issues: (1) reasons behind Saudi students’ underperformance and (2) limited research on contributing factors. TIMSS data from 2011, 2015, and 2019 were analyzed using descriptive, correlational, and regression methods. While trends across the years were explored, only 2019 data were used for detailed …

Exploration, Exploitation, And Financial Performance: The Long-Term Advantages Of Ambidextrous Companies, Georgi Aleksandrov Kirov

Theses and Dissertations

Researchers have advanced ambidexterity as an effective organizational strategy to cope with environmental and technological change. The use of divergent and incompatible core construct conceptualizations, overreliance on cross-sectional and perceptual performance measures, and persistent scarcity of longitudinal examinations have undermined empirical conclusions that ambidexterity works. This study seeks to ascertain whether ambidexterity enhances long-term financial performance under environmental conditions of munificence, dynamism, and external potential slack.

The study deploys a novel operationalization of the ambidexterity concept and develops company portfolios to compare the financial results of ambidextrous firms and their rivals. Based on a 25-year data set, the research finds …

Effects & Buffering Of Ai-Induced Career Insecurity Among University Students, Skyler Grunberg

Theses and Dissertations

This research examines how artificial intelligence (AI) development psychologically impacts students' perception of their future careers. Adopting a cross-sectional design, 137 university students were surveyed to investigate the relationship between AI-induced future career insecurity, well-being, work engagement, and career decision-making self- efficacy (CDMSE). AI-induced career insecurity (AICI) was found to be significantly below the neutral midpoint in university students. Confirmatory factor analysis was used to assess the item structure of AICI, finding a hierarchical model incorporating both core and wording factors was best fit. Findings indicate AICI is significantly negatively related to well-being, work engagement, and CDMSE. Though insignificant, resilience …

The Impact Of System Transparency On Perceived System Reliability, Perceived System Usability, And Information Clarity In Self-Driving Car Systems, Uditkumar Nair

Theses and Dissertations

In human-computer interaction (HCI), the development of autonomous vehicle (AV) technology has created new difficulties, especially in building user confidence as well as understanding of system functioning. The effect of system transparency on user- centered outcomes, such as perceived usability, perceived system reliability, and information clarity, is examined in this thesis. In order to evaluate their experiences in both ordinary and high-stakes driving situations, participants engaged with both system- transparent user interfaces (TUIs) and non-transparent user interfaces (NTUIs) across a number of experimental scenarios. In order to assess how well each interface conveyed system logic and actions, the study included …

Bridging The Gap: Enhancing Devops Security Through Comprehensive Threat Modeling, Ashutosh Jagdish Sonar

Theses and Dissertations

Today, security is an essential component of software development, especially in DevOps environments where rapid and continuous product release cycles are common. Systems are vulnerable to new attacks because traditional security approaches often cannot keep up with the pace of change. The threat modeling approaches used in DevOps are examined in this thesis, along with their advantages, disadvantages, and suitability for use in current software development processes. Well-known frameworks including STRIDE (Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service (DoS), and Elevation of Privilege), Attack Trees, LINDDUN (Linking, Identifying, Non-Repudiation, Detecting, Data Disclosure, Unawareness, and Non-Compliance.), Practical Threat Analysis (PTA), …

C-Band Air To Ground Communication System For Uav, Mubark Alghamdi

Theses and Dissertations

C band spectrum 5030-5091 MHz is allocated for command-and-control communication services with unmanned aircraft systems. This document evaluates the possibility of using 3GPP 5G standards for provisioning of such services. Channelization of the spectrum and major system parameters are proposed. The performance of the proposed system in channel fading environment is evaluated using MATLAB based simulations. The evaluations examine SINR, and average throughput of the proposed system at different altitudes of the unmanned aircraft system. MATLAB simulations are used to evaluate system performance in free-space environments. Signal-to-Interference-plus-Noise Ratio (SINR) and Reference Signal Received Power (RSRP) are predicted at different UAS …

Characterizing Human Mobility Patterns In Saudi Arabia Using Cellular Data, Meshal Alnefaie

Theses and Dissertations

The study analyzes human mobility in Saudi Arabia. Using crowd-source data, Riyadh mobility is analyzed to find trends and highlight mobility patterns of individuals in Riyadh. Then, the mobility of Riyadh is compared with that of Jeddah and Dammam in a similar data collection and analysis. Four mobility metrics are utilized: Number of Visited Locations (NLOC), Number of Unique Locations (NULOC), Radius of Gyration (RGYR), and Distance Traveled (DTRV). The results show interesting outcomes about individuals in the three cities. Although these cities are far from each other, they observe the same mobility patterns. These findings have the potential to …

Towards Visual Inertial Navigation With Fixed Tetrahedral Targets, Joao Leonardo Silva Cotta

Theses and Dissertations

This dissertation presents a robust method for 6DoF position estimation under impaired visual conditions utilizing a minimum 4-point Perspective-n-Point (P4P) solver designed for tetrahedral targets. Using SO(3) × R 3 instead of SE(3), the method uses a Lie group-based formulation to discriminate between rotation and translation, thereby enabling computationally efficient, resource-conscious op- optimization while preserving correct geometric behavior. Designed using the contemporary C++17 library ShomerTarget, the solver is analytically formulated and assessed under pragmatic robotic conditions. Particularly in low-light and high-dynamic environments, experiments on embedded systems, UAVs, and NASA’s Astrobee show that the proposed solver attains enhanced accuracy compared to …

Development Of A 3-Dof Contactless Magnetic Joint Actuator, Elle Whitney

Theses and Dissertations

The magnetic joint actuator is a relatively recent research technology that expands on the brushless DC motor to encompass rotation in three degrees-of-freedom. These actuators involve a stator with a series of electromagnetic coils oriented normal to a spherical permanent magnet rotor which can be controlled by modulating the current of the stator coils. The development of a magnetic joint actuator that operates without a physical connection between the stator and the rotor has wide applications for robotics in dust-sensitive environments, where a device with bearings would otherwise falter. This work details the design, sensing, and control of such a …