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Understanding The Role Of Magnetic Field Evolution In The Initiation And Development Of Solar Eruptions, Nian Liu

Dissertations

This dissertation aims to understand the initiation and evolution of solar eruptions. The essential science questions to answer include: What is the role of magnetohydro dynamic (MHD) instabilities and magnetic reconnection in triggering and driving eruptions? What are the role of Kink Instability (KI) and Torus Instability (TI) in determining the successful and failed eruptions? What is the thermal behavior of flare precursors in the initiation stage of solar eruptions? Finally, how does the corona magnetic field respond to the flare eruptions? The dissertation mainly includes the following studies.

First, this dissertation presents a multi-instrument study of the two precursor …

Digital Image Forensics Via Meta-Learning And Few-Shot Learning, Yuxi Shi

Dissertations

Digital images are a substantial portion of the information conveyed by social media, the Internet, and television in our daily life. In recent years, digital images have become not only one of the public information carriers, but also a crucial piece of evidence. The widespread availability of low-cost, user-friendly, and potent image editing software and mobile phone applications facilitates altering images without professional expertise. Consequently, safeguarding the originality and integrity of digital images has become a difficulty. Forgers commonly use digital image manipulation to transmit misleading information. Digital image forensics investigates the irregular patterns that might result from image alteration. …

Effect Of Current Density Ramping On The Anodic Reaction And Morphology Of Aerospace Aluminum Alloys, Peter Totaro Jr.

Dissertations

Aluminum anodizing has been experimented with and studied over the last century because of its ability to form uniform, well ordered cellular coatings on aluminum alloys. Anodizing aerospace alloys has been problematic, due to the alloying elements used to add strength and resistance to stress cracking corrosion. These intermetallic compounds, i.e., copper and zinc, promote oxygen evolution and stress as they accumulate in and on the surface of the forming aluminum oxide. These inclusions lead to increased electrical resistance that forms porous and flawed coating, which can lead to industrial and field failures. The amount of voltage placed on the …

Flexibility Vs Consistency: Quantifying Differences In Neuromodulatory Elicited Patterns Of Activity, Elizabeth M. Cronin

Dissertations

Central pattern generating circuits underly fundamental behaviors such as respiration or locomotion and are under the influence of neuromodulators. The presence of neuromodulators is thought to confer flexibility to these circuits to generate distinct patterns of activity to meet distinct behavioral needs. Network output flexibility can be achieved by distinct classes of neuromodulators, those which have convergent cellular actions but divergent circuit actions or by those which have divergent cellular actions but convergent circuit actions.

Both classes of neuromodulator exist in the stomatogastric nervous system of the crab Cancer borealis and influence the activity of a central pattern generating circuit …

Sensorimotor Content Of Multi-Unit Activity In The Paramedian Lobule Of The Cerebellum, Esma Cetinkaya

Dissertations

Based on Center for Disease Control and Prevention report 2016, around 39.5 million people in the United States suffer from motor disabilities. These disabilities are due to traumatic conditions like traumatic brain injury (TBI), neurological diseases such as amyotrophic lateral sclerosis (ALS), or congenital conditions. One of the approaches for restoring the lost motor function is to extract the volitional information from the central nervous system (CNS) and control a mechanical device that can replace the function of a paralyzed limb through systems called Brain-Computer Interfaces (BCI).

One of the major challenges being faced in BCIs and also in general …

Resource Allocation, User Association And Placement For Uav-Assisted Communications, Shuai Zhang

Dissertations

In the past few years, unmanned aerial vehicle (UAV)-assisted heterogeneous network has attracted significant attention due to its wide range of applications, such as disaster rescue and recovery, ground macro base station (MBS) traffic offloading, communications for temporary events, and data collection for further processing in Internet of Things (IoT). A UAV can act as a flying base station (BS) to quickly recover the communication coverage in the disaster area when the regular terrestrial infrastructure is malfunctioned. The UAV-assisted heterogeneous network can effectively provision line of sight (LoS) communication links and therefore can mitigate potential signal shadowing and blockage. The …

Development And Evaluation Of A Hand Exoskeleton For Neurorehabilitation Post Stroke, Ashley Joyce Mont

Dissertations

Stroke affects approximately 800,000 people in the United States each year, and due to its chronic effects, it is one of the leading causes of disability. Many individuals with stroke suffer the loss of motor function in their paretic upper extremity, and longitudinal studies show that 30 — 66% of individuals with hemiplegia fail to regain arm function six months post stroke. After a stroke, the brain undergoes neuroplasticity which will promote recovery of function. Investigators and clinicians are trying to develop rehabilitation interventions that can be designed to promote neuroplasticity, enhancing the recovery outcomes of therapy.

For individuals with …

Modeling Of Two-Dimensional And Biological Materials Towards Diverse Nano-Systems Applications, Jatin Kashyap

Dissertations

This dissertation studies the demonstration of materials ranging from two-dimensional (2D) materials to small bio-molecules using various atomistic/molecular and sub-atomic particles (electron, hole, excitons) modeling techniques for multi-domain applications. Three categories of materials/systems are investigated as follows: 2D materials, biological materials, and complexes of 2D and biological materials.

The first problem demonstrates wrinkles' ubiquitous presence in two-dimensional materials significantly alters their properties. It is observed that water molecules, sourced from ambient humidity or transfer method, can get diffused in between Graphene and the substrate during the Graphene growth. The water diffusion causes/assists wrinkle formation in Graphene, which influences its properties. …

Towards Ensuring Integrity And Authenticity Of Software Repositories, Sangat Vaidya

Dissertations

The software development process comprises a series of steps known as a software supply chain. These steps include managing the source code, testing, building and packaging it into a final product, and distributing the product to end users. Along this chain, software repositories are used for different purposes such as source code management (Git, SVN, mercurial), software distribution (PyPI, RubyGems, NPM) or for deploying software based on container images (Harbor, DockerHub, Artifact Hub). In the recent past, different types of repositories have increasingly been the target of attacks. As such, there is a need for mechanisms to ensure integrity and …

Decoding Human Movement Through Experiments And Simulation, Vishnu Deep Chandran

Dissertations

The ability to walk or move independently plays a decisive role in one's quality of life. This human ability requires complex coordination with several systems, such as the nervous, muscular, skeletal, and sensory organs, to execute movement tasks. Hence, any disorder of these systems from injury, disease, or aging severely affects the ability to walk or move independently. Disabilities that impair movement severely affect the quality of life. Therefore, studying the changes affecting human movement is necessary to improve the lives of individuals with impaired movement. Since human movement is complex and many systems interact in non-intuitive ways, the overarching …

Formation Of Oil Particle Aggregates And The Impact On The Fate Of Oil, Wen Ji

Dissertations

Spilled oil slicks are likely to break into droplets offshore due to wave energy. The fate and transport of such droplets are affected by suspended particles in local marine environment, through forming oil particle aggregates (OPAs). OPA formation is affected by various factors, including the properties of the particles and oil, the mixing energy and duration, etc. To investigate the impact of these factors, lab scale experiments are conducted by using seawater (both artificial and natural) and kaolinite and silica to simulate the formation of OPAs in baffled flasks. In the first experiment, 9 gm and 3 gm spherical silica …

Passive Interpretable Deep Learning From Cell Phone Activity For Optimal Patient Care, Pelin Ayranci

Dissertations

The majority of individuals in need of mental healthcare fail to seek it, and the diagnosis of those who do is driven predominantly by the patient's subjective self-assessment. There is a need for mental illnesses trackers that measure psychological and physiological symptoms and provide alerts and interpretable data for therapeutic interventions. We present a system that complements existing protocols to detect distress in mental health, passively monitor patients, and quickly alert authorized parties on possible mental health distress. We evaluate modeling a person's mental health from the sensors and activity logs of her/his cell phone using logistic regressions, LSTM, and …

Critical Mass Of Women On Biotech Corporate Boards And Its Implication For Firm Performance: A Mixed Method Explanatory Sequential Study, Shesh Sharma

Dissertations

This study examined the influence of demographic, functional, and cognitive diversities on firm performance of North American Biotech companies using a mixed method explanatory sequential approach. One-year cross-sectional data of 100 companies was analyzed followed by purposeful semistructured interviews with eight board members from the dataset. The combined results resolved several ambiguities present in the literature regarding board selection, composition, and the correlation of board diversity with firm performance. This study used the well-known market-based financial metric Tobin’s Q to measure firm performance.

The quantitative results showed a dichotomous relationship between gender ratio and Tobin’s Q based on a theoretically …

Parameter Selection In Fully Homomorphic Encryption Schemes And Fhe Applications, Cavidan Yakupoglu

Dissertations

Quantum computing has been gaining momentum as a result of recent technological advances. Existing cryptographic systems rely on the difficult problems that can be solved by sufficiently powerful quantum computers. As the quantum age approaches, the desire to discover new difficult problems that cannot be solved by quantum systems has increased. Lattice-based cryptography is a prominent tool for the post-quantum era that facilitates the implementation of encryption systems for practical applications.

The Learning with Error (LWE) and Ring-LWE problems introduce new lattice hardness assumptions that have been incorporated into public-key cryptosystems to facilitate the implementation of numerous privacy-enhancing applications. Fully …

The Relationship Among Menopausal Knowledge, Stress, And Symptom Management In Southern Rural African American Women: A Developmental Perspective, Susan L. Prather

Dissertations

More than 12.9 million African American women are between the ages of 45 and 54, which is the perimenopausal period. Regardless of the millions of African American women transitioning to menopause yearly, very little information is available about their experiences, and even less is known about how they manage their symptoms.

The purpose of this study was to examine the relationship between menopausal knowledge, stress, and symptom management among rural southern African American women. Researchers have examined menopausal experiences over the last two decades; the majority of health information about menopause is based on studies of middle-toupper-class Caucasian women. Hence, …

Patient Perception Of Intensive Care Unit Discomfort, Essa Hakamy

Dissertations

Background: Discomfort has a significant effect on patient health and well-being; however, the symptoms are often difficult to address in ICU. Most patients in ICU are unable to communicate, making it difficult for physicians and nurses to distinguish between pain and discomfort. For example, artificial airways and assisted ventilation prevent patients from communicating. Patients may also have difficulty communicating due to delirium, fatigue, sedation, or neurological disease. Rationale: Discomfort has a considerable influence on patient health outcomes and well-being if not identified and addressed. Researchers have not explicitly explored discomfort apart from pain, which underscores the importance of studying the …

Importance Of Alkyl Substitution On The Molecular Architecture And Thermomechanical Performance Of Glassy Polybenzoxazine Networks, Bernardo L. Barea-López

Dissertations

This dissertation aims to elucidate different aspects of network formation in different thermosetting polybenzoxazines and the implications on the final morphology, free volume, solvent ingress, and thermomechanical properties. This research is divided into five distinct fragments 1) benzoxazine monomer synthesis, 2) implications of the meta-substitution of the aniline species in the cured benzoxazine network, 3) effect of the cure protocol on meta-substituted aniline based benzoxazine matrices, 4) investigation of the utilization of different bisphenol species for the formation of novel and known benzoxazine networks, and 5) the elucidation of the cure-induced shrinkage of benzoxazine networks utilizing an improved method developed …

Cultural Intelligence Practices Community College Presidents Use To Lead Their Organization, Jennifer Marta

Dissertations

Purpose: The purpose of this qualitative multicase study was to discover and describe the cultural intelligence practices California community college presidents use to lead their organization through the four dimensions of Ang et al. (2007) cultural intelligence (CQ) framework. Lastly, this study will examine the CQ practices of California community college presidents through the four dimensions of Ang et al.’s (2007) CQ framework.

Methodology: This qualitative multicase study was conducted through semistructured interviews of four California community college presidents to discover their use of CQ practices. Artifact collection and review was used to further describe how they use CQ practices …

A Structured Orientation Development System For Nursing Faculty, Dana R. Mangum

Dissertations

A national nursing shortage is nearing its crest. The Baby Boomer generation is begining to retire in record numbers. Healthcare technology is continually evolving and the topography of nursing education is changing. In order to aquire, develop, and retain excellent nursing faculty to meet the ever changing demands, nursing faculty need to be streamlined into the world of academia. A Structured Orientation Development System (SODS) was developed to aid nursing faculty into the transition from expert bedside nurse to expert nursing faculty. A literature review found no evidence of a structured type nursing faculty orientation system. The purpose of this …

An Examination Of The Effects Of Workgroup Characteristics On Criminal Case Processing & Case Outcomes, Luis Torres

Dissertations

The court communities and inhabited institutions perspectives posit that courts should be examined through a lens that considers the complex and collaborative process that court actors (e.g., judges, prosecutors, and defense counsels), collectively referred to as the courtroom workgroup, engage in during case processing. However, empirical research infrequently examines such intricacies and devotes little attention to how the characteristics of workgroup members influence courtroom interactions, the efficiency they process cases, and ultimately case decisions. This omission is notable because theory asserts that the dynamics of the workgroup are at least in part driven by the characteristics of its members.

This …

A Crisis Should Not Be Wasted: A Phenomenological Study On How Female Leaders From Military Academic Institutions Find Common Ground During Crisis, Diana Molodilo

Dissertations

Purpose: The purpose of this phenomenological study was to identify and describe the lived experience of female leaders from military academic institutions in finding common ground during crisis situations.

Methodology: This phenomenological study identified and described how female mid-level leaders from Defense Language Institute Foreign Language Center and Naval Postgraduate School found common ground during crisis. The population for this study includes all female leaders from military academic institutions in California, which is estimated at 60 to 100, of which 16 were sampled.

Findings: The findings from this research illustrate that female leaders found common ground when they (a) consistently …

A Study Of Red Snapper (Lutjanus Campechanus) Ecology In The Northern Gulf Of Mexico And The Effect Of Variable River Outflow Using Stable Isotope Analysis Of The Food Web And Eye Lenses, Caitlin C. Slife

Dissertations

In the Mississippi Bight and surrounding waters, river outflow impacts the basal resources of the Red Snapper food web, altering carbon sources and impacting prey and predator isotopes. In this study, the impact of riverine outflow on nutrients, particulate organic matter (POM), and physical water parameters on Red Snapper and their food web was analyzed using stable isotope and stomach content analysis over 5 years. The Mississippi, Pearl, Pascagoula, and Mobile rivers were included in the analysis of river impact. The Mississippi and Mobile rivers were found to significantly impact nutrients and POM in the region. River outflow was also …

A Phenomenological Exploration Of The Lived Experience Of Military Spouses Of Veterans With Combat-Related Post-Traumatic Stress Disorder, Teresa W. Yambo

Dissertations

A phenomenological study was conducted to explore the essence of the experience of military spouses living with veterans with combat-related Post-traumatic Stress Disorder (PTSD). Husserlian phenomenology was chosen as the theoretical framework because it allowed a deeper understanding of the unfolding o f the spouses' day-to-day experience. A purposive sample of 14 spouses living with veterans with symptoms of PTSD participated in unstructured interviews. Data were analyzed using a modification of Colaizzi's method. Four major themes were identified from data analysis: Recognizing Life is No Longer the Same, Living with Unpredictability, Bearing the Burden, and Creating a New Life. Spouses …

The Effects Of Prescribed Fire On Ant-Mediated Seed Dispersal In Missouri, Eva M. Colberg

Dissertations

Many aspects of animal-mediated seed dispersal are vulnerable to disturbance, including partner identity and dispersal quantity and quality. This dissertation explores ant-mediated seed dispersal of the herb Sanguinaria canadensis in Missouri Ozark oak forests, where prescribed fire is a common land management tool. In Chapter 1, I test the definition of a keystone seed disperser using absolute and relative contributions of different ant species to the quantity and distance of seed dispersal, based on field observations of S. canadensis seed dispersal. I demonstrate that the ant Aphaenogaster rudis is better described as a numerically dominant rather than keystone seed disperser, …

Agenda Setting On The Supreme Court Of The United States In 1960, 1977, And 1992, Jessica L. Curtis

Dissertations

This dissertation adds to Supreme Court of the United States agenda-setting research by exploring the following overarching research question: How does the Supreme Court of the United States decide which cases it will review? In addition, this study addresses three gaps in the agenda-setting research by considering types of petitions for writ of certiorari that are often ignored by other studies, analyzing the Court’s case-selection process as a two-step process, and studying the Court’s agenda-setting trends over time. To explore these gaps in the research, an original dataset was created by collecting data on a random sample of petitions for …

Stress, Bullying, Cortisol, And Depressive Symptoms In 9th Grade Adolescents, Susan G. Williams

Dissertations

Stress and bullying are known contributors to depressive symptoms in adolescents. Prevalence of depressive symptoms in adolescents is estimated to range from 13% to 34% in recent studies. Ninth graders are in a transitional period developmentally, biologically, physically, and psychosocially. Few studies have examined the relationship between stress, bullying, and depressive symptoms from a biobehavioral perspective in 9th graders. The purpose of this study was to examine stress, bullying, and depressive symptoms including a biomarker of stress, salivary cortisol diurnal rhythm, to determine if there is mediation between the individual variables of stressful life events, perceived stress, bullying, and depressive …

Virtual Reality Simulation's Influence On Nursing Students' Anxiety And Communication Skills With Anxious Patients, Tanae A. Traister

Dissertations

The incidence of medical-surgical patients with a secondary anxiety diagnosis is increasing, and nurses' feelings of inadequacy in communicating with anxious patients have hindered the therapeutic nurse-patient relationship, negatively impacting patient outcomes. Simulation methods such as high fidelity simulation and standardized patients have decreased nursing students' anxiety levels in caring for anxious patients. However, they face maintenance costs, availability, and consistency barriers. Full immersion virtual reality simulation has demonstrated
success in nonhealthcare and medical education but is limited in nursing education. Nursing students from an associate and bachelor's degree nursing program participated in a full immersion virtual reality simulation anxious …

Student Nurses' Senior Practicum Experience And Its Role In Transition To Practice, Trilla A. Mays

Dissertations

Newly graduated nurses (NGNs) are not prepared to transition to practice, often leaving practice within the first year. The purpose of this descriptive qualitative study, guided by Meleis' transition theory, was to explore the NGN's perceptions of their senior practicum experience and how the experience prepared them for transition to practice. The Covid-19 pandemic limited recruitment of participants. After extended recruitment efforts, three NGNs were recruited, interviewed using a semistructured interview guide, and recorded using Zoom, which was verified while listening to the recording. The Ravitch and Carl three-pronged coding approach and NVivo was used to assist with the manual …

Family Rejection Predicting Suicidal Thoughts And Behaviors Among Sexual Minority Males: Indirect Effects Through Internalized Homophobia And The Interpersonal Theory Of Suicide Constructs, Brian Bulla

Dissertations

Past research has identified sexual minority males as presenting with more suicidal thoughts and behaviors in comparison to the general population, possibly due to additional stressors (e.g., family rejection, internalized homophobia) encountered throughout their lives that are specific to minority identities (Meyer, 2003). Extant literature has also examined constructs from the Interpersonal Theory of Suicide (ITS; Joiner, 2005; Van Orden et al., 2008) with mixed support for each (e.g., perceived burdensomeness, thwarted belongingness, capability) predicting suicidal thoughts and behaviors among sexual minority males. The current study, therefore, sought to further existing literature by examining indirect effects of family rejection on …

Adults With Preexisting Diagnosis Of Heart Failure In The Environment Of Coronavirus Disease 2019, Ronald Phillips

Dissertations

Background: Heart disease continues to be the leading cause of death among adults in the United States and other industrialized countries. Heart failure (HF) is a form of heart disease and has become an epidemic with complications and medical care costs increasing at an alarming rate. HF affects more than 5.7 million adults in the United States with an incidence between 550,000 to 670,000 annually, primarily affecting females, African Americans, and adults aged 55 years and older. HF is also associated with a high rate of mortality, estimated to increase, with a risk rate of 13%, 32%, and 64% among …