Digital Commons Network^™

Parenting Styles And Experiences Of Parents Of Children With Down Syndrome Displaying Aggressive Behaviors, Melanie Ray

Walden Dissertations and Doctoral Studies

No abstract provided.

Transformational Leadership And Financial Sustainability Of American Fastfood Nonfranchise Restaurants, Amar Verma

Walden Dissertations and Doctoral Studies

No abstract provided.

New Graduate Nurses' Experiences Of Leaving The Emergency Department, Gemma John

Walden Dissertations and Doctoral Studies

No abstract provided.

The Perspectives Of Parents On Barriers To Parental Involvement In Title I Schools, Beverly Pascal

Walden Dissertations and Doctoral Studies

No abstract provided.

Leadership Practices Contributing To Academic Success In High-Performing Elementary Title I Schools In Texas, Jowie Walker

Walden Dissertations and Doctoral Studies

No abstract provided.

Towards Efficient Continual Learning: From Memory Optimization To Foundation Models, Zilin Luo

Dissertations and Theses Collection (Open Access)

Continual learning, also termed lifelong learning, enables machine learning models to incrementally acquire new knowledge while mitigating the degradation of previously learned information—a capability essential for adapting to dynamic, real-world data environments. This dissertation investigates the core challenges of continual learning and extends its application to enhancing training efficiency in the era of foundation models. The first part of this dissertation addresses the constraints of few-shot exemplar storage with a novel compression framework. While leveraging class activation maps to downsample non-discriminative pixels, we introduce an adaptive masking model, optimized through bilevel optimization, to store more exemplars efficiently. The second part …

Foundation For A Digital Beamforming System Using Software Defined Radio, Daniel Cruz Guerrero, Shiron Bendrihem, Benjamin Tucker

Electrical Engineering

This report demonstrates a basis for the foundation of a software-defined radio (SDR)-based digital beam forming system. Specifically, a discussion of time, frequency, and phase synchronization is had in the absence of costly hardware like an OctoClock. Furthermore, this report digs deep into the design process and device characterization of a 4-way Wilkinson Power Divider, which is a necessary hardware component for phase calibration. SDR synchronization and calibration are critical in any digital beamforming system.

Design And Characterization Of A Pulsed Electric Field Chamber For Microalgae Lysis, Connor Strutin

Electrical Engineering

Microalgae are a promising renewable source of biofuel due to their high lipid content and rapid growth rates; however, algae cells must be electroporated (lysed) to release these lipids. The system developed in this project applies short (40 μs–10 ms), high-intensity (up to 33 kV/cm) pulsed electric fields (PEF) across cell membranes to enable electroporation.

Our lab-scale PEF chamber generates uniform, high-intensity electric fields using parallel-plate electrodes with sub-millimeter spacing. The system is designed to efficiently lyse microalgae cells for lipid extraction and biofuel production.

Maximum Power Point Tracking For Photovoltaic Cells, Rodrigo Menchaca-Ramirez, Jesus Martinez, Steven Rodriguez

Electrical Engineering

Unlike an ideal DC Power Supply, a solar panel does not operate with linear I-V Characteristics. The voltage and current characteristics of a solar panel change based on irradiance, temperature, weather conditions, and load demand. Because of these factors, solar panels do not always operate at their Maximum Power Point, which can lead to significant power losses. Maximum Power Point Tracking is used to adjust the panel operating point so that more usable power can be delivered to the load.This project developed a Maximum Power Point Tracking system using an STM32 Nucleo-L4A6ZG microcontroller and an LT8705A DC-DC converter stage. The …

Justice In Literary Examinations Of African American Incarceration And Death Row, Molly Kate Malone

ETDs from 2020-2029

In the United States justice system, the use of the death penalty has been the subject of major disputes. Some argue that the death penalty is a form of justice, while others believe it is the opposite of what justice should be. Those that disagree with the death penalty are more aligned with the concept of “true justice,” meaning that marginalized groups such as Black and/or poor people should be treated justly despite the systemic racism and classism present in the justice system. Because the death penalty disproportionately affects these marginalized groups, it is impossible for true justice to be …

From Transcriptome To Function: Multimodal Characterization Of Transcriptionally Defined Ventral Tegmental Area Dopamine Neurons, Natalie Dalton Fitzgerald

ETDs from 2020-2029

Substance use disorder is a complex neurobiological disease characterized by impaired control over drug taking and drug seeking. Drugs of abuse exert their reinforcing effects largely through dopaminergic (DAergic) projections from the ventral tegmental area (VTA) to the nucleus accumbens, where all drugs of abuse increase DA transmission. Beyond reward processing and reward learning, the VTA contributes to a range of psychiatric conditions, including schizophrenia and attention-related disorders. Although DA signaling has long been a major focus of addiction research, recent transcriptomic studies have revealed substantial heterogeneity of cell types within the VTA. Previous work from our lab identified two …

Advancing Telehealth Pulmonary Rehabilitation For Individuals With Copd: Integrating Scoping Review, Quantitative, And Qualitative Studies To Inform A Multidomain Telewellness Framework, Pooja Arora

ETDs from 2020-2029

Background Chronic obstructive pulmonary disease (COPD) is a heterogeneous, progressive respiratory condition and the third leading cause of death worldwide. It is associated with dyspnea, reduced exercise tolerance, significant psychological burden, and poor quality of life. Telehealth pulmonary rehabilitation (PR) has evolved as an effective approach to improve health outcomes and overcome barriers related to center based pulmonary rehabilitation. However, it is important to determine whether these programs are guided by intervention frameworks that effectively promote overall well-being in individuals with COPD. This dissertation examined current telehealth PR models and evaluated the effectiveness of a generic, comprehensive telewellness program (MENTOR: …

Advanced Mathematical Modeling And Data-Driven Techniques For The Diagnosis Of Diabetes Using Continuous Glucose Monitoring (Cgm) Data, Farah Morsi

Theses

Diabetes mellitus is a major and growing health challenge, particularly in the Middle East and North Africa (MENA) region. Continuous Glucose Monitoring (CGM) provides high-resolution time-series data that capture detailed glucose fluctuations over time. However, conventional CGM summary measures, such as mean glucose, standard deviation, and time-in-range, may not fully describe the nonlinear temporal structure of glucose dynamics.

This thesis investigates nonlinear dynamical approaches for analyzing CGM time series, with a focus on recurrence-based analysis and ordinal-network analysis. Recurrence-based methods, including recurrence quantification analysis (RQA), are used to characterize geometric and temporal patterns in reconstructed phase space, while ordinal networks …

استخدام تقنيات الذكاء الاصطناعي في إجراءات الاستدلال والتحقيق "دراسة مقارنة", حمد مصبح اليليلي

Theses

The Use of Artificial Intelligence Techniques in Reasoning and Investigation Procedures: Comparative Study

This research aims to analyze the role of artificial intelligence (AI) technologies in the stages of criminal investigation and inquiry through an applied analytical study. It focuses on the use of these technologies to support law enforcement and investigators with advanced scientific methods, particularly in analyzing digital evidence and accurately linking it to suspects. The study also explores the future development of these systems through their integration with AI technologies to enhance the efficiency of criminal investigation.

The United Arab Emirates has consistently been keen to develop …

On The Fractional Laplacian Type Operator, Maysam Abdulnaser Zain

Theses

In this thesis, we study analytical structures arising from Dunkl theory and their

applications to harmonic analysis and fractional Laplacian operators. Dunkl operators are differential–difference operators associated with finite reflection groups, providing a natural generalization of the classical Fourier analysis through the introduction of root systems and multiplicity functions. Within this framework, several classical transforms appear as special cases of the (k,a)-generalized Fourier transform. We study the generalized Fourier transform ��ₖ,ₐ, its kernel B_k,a (x,y), and the associated translation operator and convolution structures. Using these tools, we construct the corresponding heat …

Effects Of Led Light Spectra And 1-Mcp On Postharvest Quality And Bioactive Compounds Of Cucumber (Cucumis Sativus L.) During Cold Storage, Imad Eldin Abbas Yousif

Theses

Extending postharvest quality and maintaining the nutritional value of cucumber fruit requires specific storage conditions to postpone senescence and enhance marketability. The postharvest lighting environment is a main factor that influences quality preservation for harvested biomass. The objective of this study was to investigate the effects of different light emitting diodes (LED) spectra (green, red, blue, and white LED) alone or in combination with 1-Methylcyclopropene (1-MCP) on postharvest quality and bioactive compounds of cucumber fruit during cold storage for 16 days at 5°C, the control fruit were left in the dark. For combined treatment, the fruits were exposed to 1-MCP …

Control And Entrainment Of Oscillatory Dynamics In An Oncolytic Virus–Tumor Model Under Periodic Therapy Forcing, Aya Salaheddin Shujrawi

Theses

This thesis investigates the dynamics of a tumour–virus interaction model under sinusoidal periodic viral injection, using the three-compartment ordinary differential equation framework of Baabdulla and Hillen (2024). The aim is to characterise how the frequency and amplitude of periodic injection interact with the system's intrinsic oscillatory dynamics, and to identify conditions for stable frequency entrainment. Equilibrium and Hopf bifurcation analysis of the autonomous system yields a supercritical bifurcation at θ_H^auto ≈ 338.45 with intrinsic frequency Ω₀^auto ≈ 0.7552. Introducing a constant baseline injection u₀ = 0.05 raises the threshold to θ_H^forced ≈ 364.85 and shifts …

Sea-Ice Observation In The Arctic By The Arab Satellite 813, Simulated By The Radiative Transfer Model ‘Sciatran’, Tuqa Mohsin Al Hajri

Theses

The purpose of this research is to explore the spectral behavior of sea ice and to understand how Arctic sea ice surfaces appear when they are observed with a hyperspectral sensor. This is crucial because sea ice changes a lot during the melt season, and different surface types can sometimes look similar to a human eye, but physically they are different. It is thus essential to identify the spectral differences between these surfaces. The main objective of this study is to examine how the spectra of white ice and melt ponds change when their physical and optical properties are varied, …

Fractional Bernstein Polynomial Approximations For Nonlinear Timefractional Partial Differential Equations, Reem Abdul Quzli

Theses

This thesis studies the numerical approximation of nonlinear time-fractional partial differential equations using fractional Bernstein polynomials. The main model considered is the nonlinear time-fractional foam drainage equation, in which the classical time derivative is replaced by the Caputo fractional derivative. This formulation introduces memory effects into the model and allows the present drainage behavior to depend on the previous evolution of the liquid fraction.

The proposed method approximates the solution by a finite expansion of fractional Bernstein basis functions. After substituting this approximation into the governing equation, the residual is expanded in powers of t^�� . The unknown coefficient …

Impact Of Institutional Expected Practice Guidelines On Oral And Long-Acting Intravenous Antibiotic Use For Serious Bacterial Infections, William Bradford

ETDs from 2020-2029

Expected practice interventions are a type of antimicrobial stewardship intervention in which local guidelines regarding antimicrobial prescribing are developed and released at an institutional level to establish an institutional standard of care. An expected practice intervention to encourage use of oral and long-acting IV (PO/LAIV) antibiotics for serious infections was performed at the University of Alabama at Birmingham Hospitals in November of 2022. We conducted a quasi-experimental pre/post study using a difference in differences approach to evaluate the effect of these guidelines on a primary outcome of length of stay (LOS) and secondary outcomes of inpatient antibiotic days, 3-month readmission, …

Mapping Structural Mistrust In Medicine, Ashleigh Allgood

ETDs from 2020-2029

Much of the existing literature treats mistrust as resistance or noncompliance. A structural perspective reverses that logic. It views mistrust as a reflection of institutional behavior rather than individual belief. When systems repeatedly fail to protect or repair harm, withdrawal becomes a reasonable and protective response. Structural mistrust represents both an adaptation to inequality and a cumulative record of institutional unreliability. This dissertation develops and tests a theory of structural mistrust as a collective orientation that links institutional design to individual behavior and perceived health. It makes three contributions. First, it conceptualizes structural mistrust as a product of state institutions …

Investigating The Effects Of Increased O-Glcnaylation On Pathology In Alzheimer’S Disease, Melissa Louise Garcia

ETDs from 2020-2029

Alzheimer’s disease (AD) is currently the 7th leading cause of death, with few treatment options. It is known that AD pathology begins 20-30 years before clinical symptoms manifest. Some of the earliest pathological changes occur in glial cells of the hippocampus, causing them to become chronically reactive, as well as the accumulation of Amyloid-β (Aβ) in the hippocampus and hyperphosphorylated Tau (pTau) in the locus coeruleus, resulting in dysfunction of the noradrenergic (NA) system. Preclinical studies have shown promise in the abilities of the post-translational modification O-linked β-N-acetylglucosamine (O-GlcNAc). O-GlcNAc is a tightly regulated reversible enzymatic modification controlled by the …

The Impact Of Economic Stability On Diagnostic Timing Of Autism Spectrum Disorder In Children, Leslie Box Simms

ETDs from 2020-2029

Diagnosis of neurodevelopmental delays in children, including autism spectrum disorder, is an often lengthy and burdensome process, potentially placing children with economic instability at risk for diagnostic delay. The first aim of this dissertation was to explore the impact of economic stability on diagnostic timing of autism spectrum disorder via a scoping review of the literature. Papers were summarized by study design, data sourcing, handling of variables, statistical methodology, and the effect of economic stability factors on diagnostic timing of autism. Income and healthcare insurance were the most frequently employed measures of economic stability, with transportation, housing, and food security …

What If?, Jennifer Love

ETDs from 2020-2029

WHAT IF? JENNIFER LOVE MASTER OF ARTS IN ENGLISH – CREATIVE WRITING ABSTRACT What If? is a contemporary romance novel set in Birmingham, AL and Manhattan, NY. The story follows ex high school sweethearts, Liyah Mason and Max Thomas, who broke up shortly after their graduation. One night, while at the same restaurant, Max and Liyah reconnect. Their reconnection results in Liyah’s boyfriend, Owen, breaking up with her. Feeling the need for a reset, Liyah goes to New York. Due to a career ending injury, Max’s career as a major league baseball player is cut short. In the midst of …

Aging Like A Pro: Altering Health Behavior Motivation Through Community Education Programs, Susan Eva Fox-Rosellini

ETDs from 2020-2029

ABSTRACT Population aging presents significant public health challenges, particularly in preventing cognitive decline and maintaining functional independence among older adults. Today in the United States, the National Institutes of Health (NIH) estimates that about 40% of people aged 65 or older have age-associated memory issues. That number is expected to more than double by 2060. Community-based education programs can represent a scalable strategy to influence behavior modification that may be linked to successful cognitive aging. This dissertation evaluated the Aging Like A Pro (ALP) community education program that focused on key aspects of health: sleep, mindfulness, nutrition, and fitness, encouraging …

The American Revolution As America’S Civil War: Rethinking National Transformation, 1776-1877, Lucille Harlow

ETDs from 2020-2029

This thesis reinterprets the American Revolution by examining it not solely as a colonial rebellion against British authority but as a conflict that unfolded within American society itself. Long before independence was declared, political authority in British North America had already begun to fracture. Imperial institutions weakened, while revolutionary committees, militias, and local associations asserted competing claims to legitimacy. Rather than emerging from a unified population rising together in common purpose, the Revolution developed within communities already strained by suspicion, surveillance, and contested allegiance. Drawing on soldiers’ diaries and memoirs, including those of John Adlum, Jeremiah Greenman, Joseph Plumb Martin, …

Elucidating The Role Of The Rnf20 Histone Modifier In Pancreatic Beta Cells, Tanya Hans Pierre

ETDs from 2020-2029

Diabetes is defined as a loss of functional beta cell mass. It is classically categorized into Type 1 Diabetes (T1D), immune-mediated beta cell destruction and Type 2 Diabetes, which is characterized by whole body insulin resistance alongside beta cell dysregulation. The incidence of diabetes worldwide has risen annually. Despite the presence of therapeutic interventions, diabetes’ heterogeneity can prompt ineffective glycemic control and the development of diabetes-associated comorbidities. For that reason, new approaches to glycemic control for individuals with diabetes are required. One approach to restore glucose homeostasis is beta cell replacement therapy, in which stem cells are programmed into beta-like …

Exploring Medical Mistrust In A Higher Education Context: A Mixed Methods Study, Kiera Denise Walker

ETDs from 2020-2029

Medical mistrust, a type of institutional distrust, has been identified as a social determinant of health and a barrier to utilization of healthcare services. It has been negatively associated with preventive disease screenings, vaccine hesitancy, medication adherence, organ donation, research participation, and overall lower healthcare satisfaction. This can result in a widening of health disparities, an increase in prevalence of preventable diseases, and negative health outcomes despite accessibility to healthcare. The purpose of this study is to assess how medical mistrust manifests across the higher education context and explore what factors contribute to its existence among this population. An explanatory …

Emotion In Absence: Omission, World War I, And Masculine Vulnerability In Ernest Hemingway's In Our Time, Anna Murph

ETDs from 2020-2029

This thesis analyzes Ernest Hemingway’s depictions of male-male and male-female relationships in his collection of short stories, In Our Time. By comparing heterosexual and homosocial relationships, I explore how Hemingway’s depictions of male bonds are not only unique due to his famed terseness but also rooted in shared understanding, prompting a reconsideration of how male bonds are interpreted textually. I consider Hemingway’s use of omission and focus on how his minimalistic style lends to a reading of male-male relationships as more emotionally intimate than heterosexual relationships. When analyzing omission and relational dynamics through concepts such as gesture, touch, identity, and …

Characterizing The Role Of The Paraventricular Nucleus Of The Thalamus D2r+ Neurons In Interoceptive Predictions, Briana Machen

ETDs from 2020-2029

Interoceptive predictions are internal models through which the brain anticipates future bodily states based on past experiences and environmental cues. Under healthy conditions, these predictions allow organisms to anticipate physiological needs and proactively adjust behavior to maintain homeostasis. When these processes become dysregulated, however, environmental cues can trigger maladaptive physiological responses. Although interoceptive prediction is increasingly recognized as a key mechanism underlying adaptive behavior, the neuronal circuits responsible for generating these predictions remain poorly understood. The paraventricular nucleus of the thalamus (PVT) receives convergent inputs from brain regions involved in processing both interoceptive signals and exteroceptive cues, positioning it to …