Digital Commons Network^™

Development Of Novel Protein Digestion And Quantitation Methods For Mass Spectrometic Analysis, Yongling Ai

Dissertations

Proteins are the workhorses of biology, playing multifaceted roles in maintaining cellular function, signaling, and response to environmental cues. Understanding their abundance and dynamics is pivotal for unraveling the complexities of biological processes, which underpins the foundations of molecular and cellular biology. Accurate measurement of protein quantities provides insights into cellular homeostasis, facilitates the discovery of biomarkers, and sheds light on the molecular mechanisms of diseases, bridging the gap between the molecular intricacies of proteins and their functional consequences in health and disease. The evolution of protein quantitation methodologies, from classical colorimetric assays to sophisticated mass spectrometry-based approaches, has expanded …

Depressurization Characteristics Of Steam-Based Reciprocating Vacuum Pump, Hongling Deng

Dissertations

This dissertation introduces a novel vacuum technology that leverages low-pressure saturated steam and cooling-controlled condensation, offering an efficient way to utilize low-grade thermal energy sources like waste heat, steam, or solar energy. At the heart of this technology is a unique duo-chamber vacuum pump system, featuring a reciprocating piston and a heat-conductive wall, designed to generate a vacuum through steam-condensation and cooling processes.

The core of this research lies in developing and validating mechanistic models for the steam-condensation depressurization process, a complex phenomenon involving phase change and transport mechanisms. Prior to this work, these mechanisms were not sufficiently modeled or …

The Role Of Semaphorins In Response To Injury In C. Elegans Neurons, Maria Belen Harreguy Alfonso

Dissertations

When neural tissue is injured by trauma, delicate neuronal processes such as axons and dendrites are prone to lesion damage and often disconnect. The molecular, cellular, and circuit mechanisms that underlie the regrowth and reconnection of these processes and the recovery of behavior are major challenges in the fields of neuroscience, regeneration, and resilience. At the molecular and cellular levels, signaling pathways that mediate neuronal growth cone guidance during development can play a role in neuronal regeneration and recovery from injury. One family of signaling proteins involved in this process comprises the highly conserved semaphorins and their receptors, the plexins. …

5g New Radio Access And Core Network Slicing For Next-Generation Network Services And Management, Abdullah Ridwan Hossain

Dissertations

In recent years, fifth-generation New Radio (5G NR) has attracted much attention owing to its potential in enhancing mobile access networks and enabling better support for heterogeneous services and applications. Network slicing has garnered substantial focus as it promises to offer a higher degree of isolation between subscribers with diverse quality-of-service requirements. Integrating 5G NR technologies, specifically the mmWave waveform and numerology schemes, with network slicing can unlock unparalleled performance so crucial to meeting the demands of high throughput and sub-millisecond latency constraints.

While conceding that optimizing next-generation access network performance is extremely important, it needs to be acknowledged that …

Model-Based Deep Autoencoders For Clustering Single-Cell Rna Sequencing Data With Side Information, Xiang Lin

Dissertations

Clustering analysis has been conducted extensively in single-cell RNA sequencing (scRNA-seq) studies. scRNA-seq can profile tens of thousands of genes' activities within a single cell. Thousands or tens of thousands of cells can be captured simultaneously in a typical scRNA-seq experiment. Biologists would like to cluster these cells for exploring and elucidating cell types or subtypes. Numerous methods have been designed for clustering scRNA-seq data. Yet, single-cell technologies develop so fast in the past few years that those existing methods do not catch up with these rapid changes and fail to fully fulfil their potential. For instance, besides profiling transcription …

Assessing The Feasibility And Mechanism Of Destructive Removal Of Per- And Polyfluoroalkyl Substances (Pfas) From Water, Kaushik Vinaykumar Londhe

Dissertations

One of the most pertinent challenges faced by the drinking water community is the widespread contamination of per- and polyfluoroalkyl substances (PFAS). These anthropogenic chemicals have been ubiquitously used in everyday products such as carpets, stain repellents, dyes, shampoos, non-stick cookware as well as in aqueous firefighting foams. PFAS are linked with adverse health effects in humans such as thyroid disease, obesity, immunological and reproductive disorders and linked to cancer in adults and low birth weight and developmental defects in infants.

Conventional water treatment technologies have proven to be largely ineffective in PFAS remediation, due to their extreme stability and …

Novel Photobase Generators For Photoinduced Polymerization And Ph Regulation, Shupei Yu

Dissertations

Photochemistry encompasses the investigation of chemical processes instigated by light absorption. As important branches of photochemistry, photosensitive and optical materials have attracted extensive research interests in both academia and industry. Photosensitive and optical materials are composed of polymers / small molecules with photo-responsive properties. These materials not only can absorb light in the desired energy spectrum, but also exhibit chemical / physical reactions, which can be applied to different fields such as photoredox, photo-heat, phototherapy, solar cells, diodes, etc. Among them, photobase generators (PBGs) are a series of photosensitive compounds, which absorb the incident light, then release the basic species …

Homeless Barriers: A Phenomenological Study Of Service Providers In Thurston County, Washington State, Michael Meredith

Dissertations

Purpose: This qualitative phenomenological study aims to describe the perceptions of homeless service providers in Thurston County, Washington State, and describe barriers to the homeless seeking assistance. This study interviewed ten Thurston County service providers about their perception of the barriers preventing the unsheltered homeless from using available services. Identifying barriers and developing strategies to reduce or remove them is expected to reduce or eliminate homelessness.

Methodology: This qualitative phenomenological study describes the homeless service providers' perceptions of the homeless and the barriers to the homeless seeking assistance. The researcher conducted interviews with a sample of ten service providers to …

Villa-Lobos Choros No. 1: A Study Of The Recordings, Andrei Jan Hoffmann Uller

Dissertations

This dissertation explores changing perspectives on performance practice for the well-known solo guitar work Choros No.1 composed in 1920 by Heitor Villa-Lobos (1887-1959), by documenting different interpretations heard on selected recordings from across the 20th century and into the 21st century. The methodology considers the recordings as the main object of study. Choros No. 1 features a hybrid style that makes it especially interesting for a research method that captures performance details such as articulations, dynamic and agogic accents, timbre, and tempo flexibility. This dissertation will consider performance decisions that are not often discussed in the research. For example, the …

Coworkers And Leaders: The Relationship Between Trustworthiness, Trust, And Employee Engagement, Lianne Young

Dissertations

A highly engaged workforce provides numerous organizational and individual benefits (Shuck et al., 2016), the culmination of which leads to a competitive advantage difficult to emulate (Burke et al., 2013). It remains challenging to understand how engagement develops, with little research available explaining the process (Shuck, 2020). High employee engagement levels provide a competitive advantage, but stagnant engagement levels remain a significant obstacle (Shuck, 2020).

Shuck (2020) recommends further research focusing on methods to increase engagement. Trustworthiness and trust are antecedents and drivers of engagement (Chughtai & Buckley, 2008; Federman, 2010; SHRM, 2017). A lack of trust has negative impacts …

Exploring Local Elected Officials' Capacity To Govern Effectively, Mario King

Dissertations

A successful local government exemplifies inclusivity, innovation, and deliberate decision-making, all advancing responsible management of taxpayers' resources. In this qualitative investigation, a phenomenological approach is employed to delve into the lived experiences of local elected officials. The aim of this study was to gain insights into the capacity of these local elected officials for success in governance. Subsequently, the insights from these local elected officials' experiences are harnessed to evaluate their influence and impact on municipal performance.

The management of municipal performance encompasses the provision of social services, the maintenance of fiscal operations, and adherence to statutory obligations (Avellaneda, 2008). …

Relationship Between School-Wide Positive Behavior Interventions And Supports, Student Achievement, And Teacher Efficacy In High Poverty Rural Alabama Elementary Schools, William Combs

Dissertations

The purpose of this research study is to determine if relationships exist between the level of School-wide Positive Behavior Interventions and Supports implementation, student academic achievement, and teacher self-efficacy in high-poverty rural Alabama elementary schools. The research encompassed a comprehensive analysis of existing literature, incorporating historical and policy-related context, theoretical underpinnings, relevant studies, and expert viewpoints. Additionally, the research involved the gathering and examination of data, presentation of findings, establishment of conclusions, and suggestions for prospective research directions. The primary objective of this study is to investigate potential correlations between the extent of SWPBIS (School-Wide Positive Behavior Interventions and Supports) …

Revitalizing The Middle-Skill Talent Pipeline: Exploring The Decision To Enroll In A Postsecondary Career And Technical Education Program, Felicia Hall

Dissertations

A workforce shortage exists within occupations requiring educational training beyond high school but less than a 4-year degree, known as middle-skill occupations. Career and Technical Education (CTE) programs offered at community colleges throughout the United States equip graduates at the middle-skill level. Although affordable CTE programs are readily available, little is currently known about what makes students consider and ultimately enroll in postsecondary CTE programs. This qualitative phenomenological study investigated the decision to enroll in a postsecondary CTE program as experienced by current students at a North Alabama community college to identify enablers and barriers faced during the decision to …

Mentor Teacher And Administrator Attitudes And Beliefs Toward Mentoring Programs In K-12 Education In South Mississippi, Krystle Womack

Dissertations

The teaching profession relies heavily on mentor programs to promote teacher retention, to reduce attrition and to increase the quality of new teachers. Teachers grow professionally through gaining knowledge. Mentor teachers show professional growth through knowledge gained from mentoring programs and serving as mentor teachers.

There is a significant gap in mentoring research in that the mentoring literature is limited in perspective. Research focuses solely on the perspectives of the beginning teacher or the person being mentored, but the perspective of more than one stakeholder is needed to give the full picture of induction and mentoring. This study uses a …

"Innumerable Small Crafts": Maritime Work In The Estuarian Gulf, 1865-1900, Kevin Grubbs

Dissertations

Maritime historians have argued for a highpoint in maritime activity during the antebellum years. This peak was fed by Americans travelling on tall wooden sailing ships in international trade, in the whaling industries, and as members of the US Navy. The prowess of the American Merchant Marine faded quickly in the middle of the nineteenth century due to military losses during the American Civil War and due to the rise of steamships and steel hulls. This peak was followed by another lesser peak in the Twentieth Century as American ships caught up with technological changes. World War One provided a …

Spatial Visualization Of High School Geometry Students, Jennifer Crissey

Dissertations

Spatial ability has been defined as “the innate ability to visualize that a person has before any formal training has occurred, i.e., a person is born with ability” (Sorby, 1999, p. 21) and is comprised of spatial orientation and spatial skills.Each of these facets are used in everyday life. High school students can enhance their spatial visualization skills through experiences and instruction. The purpose of this study was to test an intervention with the aim of increasing high school geometry students’ spatial visualization skills. The participants in this study were high school geometry students who were randomly placed in either …

Power-Up With Emotional Intelligence: Exploring Flight Attendant Leadership And Crew Resource Management In A Dynamic Post-Pandemic Travel Environment, Carlin Laviolet Clarke

Dissertations

In the post-pandemic travel environment, disruptive passengers fail to accept flight attendants’ leadership and cause unruly incidents that compromise flight safety, damage airlines, and present behavioral challenges that can lead to physical harm (Al-Arshani, 2021; Albert, 2016; Araiza, 2022; Albert, 2016; FAA, 2021; Inspire Academy, n.d.-a.; International Air Transport Association [IATA], n.d.-b; James, 2022; Pederson et al., 2021; Ramona & Anbro, 2017; Timmis et al., 2018; TSA, 2021; Wong & Neustaedter, 2017). Flight attendants rely on Crew Resource Management (CRM) skills to manage inflight incidents; however, CRM promotes team effectiveness and flight attendants are often dispersed throughout the cabin and …

Perceived Power By Nurse Managers In Dialysis Units: A Qualitative Case Study, Janie Griner

Dissertations

Nurses comprise the largest workforce in health care but lack power despite their numbers. Nurses have suffered short-staffing, burnout, job dissatisfaction, unsafe work settings, and cumbersome technology for decades. The dialysis nurse manager is an important component of the dialysis unit and plays a role in the retention and recruitment of nurses. Using a case study approach this qualitative, thematic analysis described dialysis nurse managers’ perception of power in dialysis units. A review of the current research revealed a gap involving dialysis nurse managers’ perception of power in the dialysis unit. The following research question was developed: • How do …

Teacher Evaluations, Pbis Implementation, And Student Outcomes, Kasey Catherine Keith Boyd

Dissertations

This study explored the relationship between the Mississippi Department of Education’s (MDE) Professional Growth System school-wide Teacher Growth Rubric (TGR) score averages by standard and student academic and behavioral outcomes (i.e. state assessment scores, discipline referrals, suspensions, attendance.). The study also examined the relationship among Schoolwide Positive Behavior Interventions and Supports (SWPBIS) implementation fidelity, MDE TGR scores, and student outcomes. Twenty-seven schools were selected to participate in the study. Fifteen of the schools were implementing with fidelity during the 2021-2022 school year, as measured by the Tiered Fidelity Inventory (TFI), and twelve schools were not implementing SWPBIS during the 2021-2022 …

Perceptions Of Stress In Community Clinic Nurses During The Covid-19 Pandemic, Jomeka Smith

Dissertations

The COVID-19 pandemic is one of the largest healthcare crises that has affected the entire healthcare industry. Community health nurses in the front-line roles are greatly threatened by the COVID-19 pandemic that has decimated healthcare systems. The well-being of nurses is vital to perform their full potential of adequate patient care. Increased demands and pandemic related stressors can increase the risk of mental health problems. Nurses work in a variety of healthcare settings, however, the expectations, the fear of the unknown, and changes in demands have largely contributed to the unprecedented stressors that accompany nurses in clinical settings. Stress among …

The Leadership Experience Of Academic Chief Nurse Administrators In The State Of Georgia During The Covid-19 Pandemic Upon Return To Campus After Full Virtual Instruction: A Qualitative Study, Susie Jonassen

Dissertations

The impact of the COVID-19 global pandemic has been rated as the highest factor of intent to leave the profession in nurses serving in a leadership role. During the pandemic, crisis leadership swept across academia partly because nursing academia was not prepared for the rapid transition to virtual instruction. The reopening of nursing programs, while pandemic restrictions were still required, caused unprecedented disruptions and stress for academic leaders. One-third of nursing faculty anticipate retirement within the next two years. With the present burnout and shortage of nursing academia leaders, there was a need to explore the lived experience of academic …

Arturo Rodriguez: A Mexican Mosaic. A Discussion Of His Life And Selected Works, Jorge Gonzalez

Dissertations

Arturo Rodríguez (b. 1976) is a Mexican composer living in Los Angeles, California. His music has gained tremendous popularity in México within the last ten years and is being performed regularly by some of the most prestigious professional orchestras in México and abroad. One of the most interesting aspects of his career is that he writes music for both the concert hall and motion pictures. His compositional output is abundant and covers a variety of genres including music for symphony orchestra, chamber orchestra, chamber music, and piano. Rodríguez has focused on the art of symphonic composition for the past fifteen …

Thermally Rearranging Polyimide Networks For High-Temperature Applications, William Guzman

Dissertations

High-performance polymers can retain functional properties when exposed to long-term or short-term durations of harsh conditions, such as mechanical action, at elevated temperatures (>177 °C). A mixture of intramolecular and intermolecular forces of and between polymer chains provide excellent property retention at elevated temperatures. Specifically, the highly aromatic nature of high-performance polymer backbones provides outstanding thermal stability, which is typically attributed to π-π stacking. However, the interrelationship between thermal stability and high aromaticity creates a challenging structure-processing relationship paradigm, which causes poor polymer processability in most high-performance polymers. Herein, it was demonstrated that rationally designing a crosslinking phenylethynyl imide …

An Analysis Of The Factors That Affect Self-Employment, Stefani Broome

Dissertations

This dissertation research identifies the factors that affect self-employment in a three-essay format. Essay one builds a foundation on analyzing the determinants that affect self-employment in the United States through a country-level time-series analysis. Essay two includes a time-series panel analysis and comparative analysis between the United States and United Kingdom by expanding on Meager’s (1992) study of the relationship between unemployment and self-employment. This analysis focuses on the United Kingdom, an outlier in Meager’s (1992) study, which included a structural change to the motivation to enter self-employment after an economic shock in the late 1970s. Essay three utilizes a …

Using Afm-Ir To Study Nanoscopic Phase Behavior Of Polymer Blends And Photovoltaic Bulk Heterojunctions, Nathaniel L. Prine

Dissertations

Conjugated polymers (CPs) and polymer blends harbor the potential for high-performance organic solar cells (OSCs) due to their short energy payback time, low cost, solution processability, lightweight attributes, and flexibility. However, OSCs suffer from poor thermal stability compared to their inorganic equivalents. This study explores the thermal instability of OSCs, focusing on phase separation of the photoactive layer under heat, resulting in morphology changes and degradation of power conversion efficiency (PCE). Utilizing atomic-force microscopy coupled with infrared spectroscopy (AFM-IR) and differential scanning calorimetry (DSC), we delve into thermal stability-morphology relationships to devise strategies to improve OSC blend durability under thermal …

Biophysical Factors Affecting Habitat Suitability For Crassostrea Virginica, Jason D. Tilley

Dissertations

Oyster reefs provide a variety of important ecosystem services. However, the mortality rate of eastern oyster, Crassostrea virginica, the dominant species that produces oyster reefs in the northern Gulf of Mexico, is increasing at an alarming rate due to a variety of abiotic and biological factors. I examined how biophysical factors, including the less-studied fatty acid profiles of the suspended particulate matter on which oysters feed, influenced morphometric condition of C. virginica.

I sampled suspended particulate matter (SPM) and oysters in-situ in the western Mississippi Sound, which historically supported the majority of oyster production in Mississippi waters. Sampling …

A Qualitative Study Of Redemptive Intelligence And The Leader’S Opportunity To Grow Performance Through Failure, Jonathan Eastman

Dissertations

This is a qualitative study about the redemptive intelligence of successful leaders and their opportunity to grow their personal and team performance through failure. Leaders who have a strong ability to leverage failures for improved performance for self and team, exhibit high levels of redemptive intelligence. Leaders who have a weak ability to leverage failures for improved performance for self and team, exhibit low levels of redemptive intelligence. After failure happens there are one of three paths that everyone will follow. They are first, a path to improved performance than what was experienced before the failure. Second, a return to …

Using Mindfulness Through Doodling In Interactive Notebooking To Increase Student Achievement, Michelle Brown

Dissertations

The SARS-CoV-2 pandemic, which unfolded from 2019 to 2021, disrupted education systems worldwide, leading to significant learning loss and inequities. The shift to digital learning, necessitated by the pandemic, presented challenges such as learning loss and social-emotional impacts. This study investigates the incorporation of Social Emotional Learning(SEL), with mindfulness, into the school curriculum to address these challenges.

The focus of the study is on the implementation of Mindful Doodling as a component of SEL within an interactive notebook in a middle school science curriculum to enhance student achievement. The study aimed to analyze how different amounts of Mindful Doodling in …

A New Approach To Synthetic Image Evaluation, Majid Memari

Dissertations

This study is dedicated to enhancing the effectiveness of Optical Character Recognition (OCR) systems, with a special emphasis on Arabic handwritten digit recognition. The choice to focus on Arabic handwritten digits is twofold: first, there has been relatively less research conducted in this area compared to its English counterparts; second, the recognition of Arabic handwritten digits presents more challenges due to the inherent similarities between different Arabic digits.OCR systems, engineered to decipher both printed and handwritten text, often face difficulties in accurately identifying low-quality or distorted handwritten text. The quality of the input image and the complexity of the text …

Investigating The Critical Literacy Practices Of Adult Learners: A Case Study Of Four Leveled Reading Courses At A Community College, Anna Fontaine

Dissertations

This study investigates the critical literacy practices of adult learners at a community college. Student participants were selected from four different leveled reading courses. In this study, four guiding questions were adopted from Klenner and Sandretto (2011): (1) How do students make personal connections to text?; (2) In what ways do students identify multiple points of view in the text?; (3) In what ways do students identify where people in the text and included or excluded from social situations?; (4) In what ways do students discuss the influences the text has had on their views of society? These four questions …