Digital Commons Network^™

Toward A Better Understanding Of Social Network Site Engagement In Influencing Health Behaviors: An Examination Of The Relationship Between Message Framing, Endorsement Cues, And User Engagement, Shawn Chunhsien Chiang

Graduate Theses and Dissertations

The use of social network sites (SNS) to deliver health interventions has been on the rise in recent years due to their popularity among the general population and functionalities that facilitate interactions with the content, or with other users of SNS. Despite that, scholars have noted challenges, including low engagement, associated with SNS-delivered interventions. This dissertation’s overall purpose is 1) to document the current state of measuring engagement within SNS-delivered health interventions, and 2) to empirically examine the interplay between message framing, social endorsement and engagement in a randomized experiment using Instagram. Results from the scoping review showed that a …

Evaluation Of The Effect Of Enterococcus Cecorum Exposure During Late Embryogenesis On Systemic Disease And Early Performance In Broiler Chickens, Marcela Arango

Graduate Theses and Dissertations

The objective of this thesis was to investigate the effects of Enterococcus cecorum (EC) administration into the amnion at day 18 of embryogenesis on performance and septicemia development in broiler chickens. Chapter I consists of a brief overview of the thesis. Chapter II provides a literature review on EC-related disease in broiler chickens and methods to isolate, detect, and differentiate between commensal and pathogenic strains of EC. Chapter III consists of a study conducted to determine if different EC strains isolated from field cases that exhibited septicemia and high mortality impacted hatchability, livability, organ colonization, and early performance in broiler …

Perceptions Of Mentoring Among High-Achieving, First-Generation College Students, Michelle Janeen King

Graduate Theses and Dissertations

The purpose of this study was to explore how high-achieving first-generation college students perceived their mentoring experiences at a public research university in the midsouth and examined what role mentoring played in their persistence. Using the narrative inquiry, the study captured mentoring perceptions and experiences of 13 high-achieving first-generation college students. Data collection included one pre-interview activity, one semi-structured interview, and a follow-up meeting with the participants if needed. Participants provided insight on five areas related to mentoring: perceptions of mentoring, development of mentoring relationships, experiences that fostered mentoring relationships, the most influential mentors, and the influence of mentoring on …

Equity And Access To Care: Barriers To Diagnostic And Treatment Services For Black Families Of Autistic Youth, Harlee Onovbiona

Graduate Theses and Dissertations

Numerous barriers to diagnostic and treatment access are present for families concerned their child might have autism spectrum disorder (ASD; e.g., long waitlists, limited specialized providers). However, Black families of autistic youth may experience additional racial barriers (e.g.., racial microaggressions, perceived stigma) due to the intersectionality of their child's disorder and their identity as Black Americans, a group that is systematically minoritized in the United States. Despite the importance of early identification and intervention, little research has documented how these barriers to treatment participation may impact perceived treatment effectiveness, treatment satisfaction, and stress among Black families of autistic youth. This …

Characterizing The Utility Of Atonik On Improving Rice Response To Herbicides, Srikanth Kumar Karaikal

Graduate Theses and Dissertations

Biostimulants can improve plant tolerance to abiotic stress by improving plant growth and development. Herbicides cause abiotic stress to crops shortly after application, which may affect yield. Preliminary tests showed that rice yield benefits from Atonik seed treatment or tank-mixture of Atonik with foliar herbicides. Experiments were conducted in the field and greenhouse to: (1) determine if seed treatment with Atonik improves rice tolerance to pre-plant herbicides; (2 and 3) evaluate the effect of Atonik seed treatment on rice response to pre-emergence and delayed pre-emergence herbicides; and (4) determine if Atonik improves crop safety of foliar-applied herbicides. Field studies were …

A Podcast - Inspirando El Futuro: Stories About Latina Leaders In Northwest Arkansas, Wendy Echeverria

Graduate Theses and Dissertations

This project aims to showcase the Latina leaders in Northwest Arkansas and empower other Latinas to dream and achieve more. With the Latin American and Hispanic communities growing rapidly, it’s essential to highlight research and changes being done in local communities. The project is a five-episode podcast. Each episode features a Latina leader and experts, and it takes a deep dive into who Latinas are, their challenges, successes, and so much more.

Ecological, Evolutionary, And Temporal Dynamics Of Animal Mortality Events, Simon Patrick Tye

Graduate Theses and Dissertations

Global declines of animal abundances are emblematic of the Anthropocene. Recent animal declines have increasingly involved more frequent and intense die-offs within populations, or mass mortality events (MMEs). These extreme demographic events can lead to rapid changes in biological communities, either by imperiling the affected population or influencing populations remaining within communities. To date, there is still limited information about the effects of predator MMEs on immediate ecological dynamics within communities and rapid evolutionary dynamics within remaining populations that may ensue. Moreover, few approaches exist to predict future occurrences of predator MMEs across broad spatial scales. To address these gaps, …

Cartographic Analysis Of Earth-Sun Relationships In Ancient Amazonia, Jackson Bennett Critser

Graduate Theses and Dissertations

The alignments of ancient man-made earthworks across the Amazon Basin, known as geoglyphs, have recently been discovered to predate early societal dates. Although much research indicated that the Amazon was uninhabitable until the last 1000 years (Meggers 1971), new evidence suggests this is not the case. The application of advanced cartographic and GIS technologies were implemented to link solar ‘marker’ days (e.g. solstices, equinoxes) with the alignment of geoglyphs, megaliths, stone architecture, and broader city forms to discover and analyze previously unknown Earth-Sun relationships across the Amazon Basin to conceivably sophisticated urban and architectural plans. The study of these geoglyphs …

The Role Of Partisan Politics On Support For Public Institutions Of Higher Education, Jason G. Ramage

Graduate Theses and Dissertations

Over several decades, a greater share of the expense of earning a college degree has shifted to students and their families as appropriations to public institutions of higher education have declined as a percentage of the overall cost to educate a student. Tuition has greatly outpaced inflation during this period, while inflation-adjusted household income has remained relatively flat. Despite all the benefits that accrue to both the college graduate and society as a whole, for the less affluent, a college education is becoming increasingly difficult to attain. Many decide the financial barriers are simply too great and elect not to …

Achieving Causal Fairness In Recommendation, Wen Huang

Graduate Theses and Dissertations

Recommender systems provide personalized services for users seeking information and play an increasingly important role in online applications. While most research papers focus on inventing machine learning algorithms to fit user behavior data and maximizing predictive performance in recommendation, it is also very important to develop fairness-aware machine learning algorithms such that the decisions made by them are not only accurate but also meet desired fairness requirements. In personalized recommendation, although there are many works focusing on fairness and discrimination, how to achieve user-side fairness in bandit recommendation from a causal perspective still remains a challenging task. Besides, the deployed …

Dpd Guided Insight On The Formation Process Of Polyethersulfone Membranes By Nonsolvent Induced Phase Separation And The Effects Of Additives, Eric Ledieu

Graduate Theses and Dissertations

Dissipative particle dynamics (DPD), a coarse grain simulation method, was applied to the membrane formation process of non-solvent induced phase separation (NIPS) to gain further insight on the mechanism of certain variables and how they affect the final morphology. NIPS involves two solutions, an organic polymer dissolved in an organic solvent colloquially called the dope and an aqueous coagulation bath, brought into contact with one another. The solvents then mix, causing the polymer to fall out of solution as an asymmetric membrane with a dense surface layer and a more open subsurface layer in response to the decreasing solubility. Polyethersulfone …

The Terroir Of Swiss Cheese: A Temporal And Geomorphological Investigation Of The Martian Co2 Sublimation Pits, Racine D. Cleveland

Graduate Theses and Dissertations

Observations by NASA Mars Global Surveyor showed evidence of rough topography on the South Pole of Mars. The topography is the result of CO2 sublimation processes that occur through the changing seasons on the red planet. These sublimation areas are known to scientists as Swiss Cheese Features (SCF). SCF are erosional degradation pits that have been studied for over two decades. Studies show that these SCF increase in area over time, but these values are collected by hand on a per feature basis. Models for the pit evolution have also played a part in understanding these SCF. This work is …

Asymptotic Properties And Separation Rates For Navier-Stokes Flows, Patrick Michael Phelps

Graduate Theses and Dissertations

In this dissertation, we investigate asymptotic properties of local energy solutions to the Navier-Stokes equations and develop an application which controls the separation of non-unique solutions in this class. Specifically, we quantify the rate at which two, possibly unique solutions evolving from the same data may separate pointwise away from a singularity. This is motivated by recent results on non-uniqueness for forced and unforced Navier-Stokes and analytical and numerical evidence suggesting non-uniqueness in the Leray class. Our investigation begins with discretely self-similar solutions known to exist globally in time and to be regular outside a space-time paraboloid. We prove decay …

A Public Policy Approach To Life After Service For U.S. Military Veterans: Mental Health, Homelessness, And Reintegration, Eric D. Button

Graduate Theses and Dissertations

This dissertation, through a public policy lens, examines life after U.S. military service as it relates to reintegration, the ability of state-level veteran-specific mental health programs to address veterans’ mental health challenges, and states’ ability to address veteran homelessness. First, I use 2019 Centers for Disease Control and Prevention (CDC) Behavioral Risk Factors Surveillance Survey data, along with various measures of state-level characteristics, to examine the influence of relevant state-level policies on veterans’ mental health outcomes. Based on multi-level modeling results, findings suggest that the presence of at least one state-level veteran specific mental health program may be a mitigating …

The Autistic Perspective: Interviewing Autistic Adults On Lived Experiences With Behavior Modification And How It Has Shaped Their Communication, Lighla R. Whitson

Graduate Theses and Dissertations

The use of behavior modification (BM) based treatment, the best-known example being Applied Behavior Analysis (ABA), is established as an evidence-based practice for promoting communication and other outcomes for Autistic individuals. As such, many Speech Language Pathologists (SLPs) use it in their practice to target various forms of communication. Among many autistic advocacy groups, however, ABA and other BM informed therapies are often described as a detriment to mental and emotional health. Organizations such as the Autistic Self Advocacy Network (ASAN) have come out against the practices and recommend finding different approaches to teaching communication skills. Much research is needed …

Analysis Of An Isolated Bidirectional Ćuk Converter, Yeny Hau Chen

Graduate Theses and Dissertations

The objective of this thesis is to perform an analysis of the isolated bidirectional Ćuk dc-dc converter topology and demonstrate the advantages and operation of this configuration through simulations using MATLAB/SimulinkTM and measurements collected from a 1.5-kW prototype tested at the Engineering Research Center (ENRC) laboratory of the University of Arkansas. The idea of integrating an active-clamp snubber circuit on each side of the converter, proposed by Dr. Sudip Mazumder from the University of Illinois, Chicago, limits the additional voltage stresses on the components due to the energy from the transformer’s leakage inductance. This is studied in this thesis to …

An Ecological Perspective Of American Rodent-Borne Orthohantavirus Surveillance, Nathaniel Mull

Graduate Theses and Dissertations

Orthohantaviruses are a global group of viruses found primarily in rodents, though several viruses have also been found in shrews and moles. Many rodent-borne orthohantaviruses are capable of causing one of several diseases in humans, and the mortality associated with these diseases ranges from < 0.1% - 50% depending on the specific etiological virus. In North and South America, orthohantavirus research was ignited by an outbreak of severe disease in the Four Corners region of the United States in 1993. However, despite the discovery of over 20 orthohantaviruses in the Americas, our understanding of orthohantavirus ecology and virus-host dynamics in this region is still limited, and orthohantavirus surveillance is generally restricted in scope to select regions and small portions of host distributional ranges. In Chapter I, I present a literature review on the current understanding of American rodent-borne orthohantavirus ecology. This review focused on under-studied orthohantaviruses, addressing gaps in knowledge by extrapolating information from well-studied orthohantaviruses, general rodent ecology, and occassionally from Eurasian orthohantavirus-host ecology. There were several key conclusions generated from this review that warrant further research: 1) the large number of putative orthohantaviruses and gaps in orthohantavirus evolution necessitate further surveillance and characterization, 2) orthohantavirus traits differ and are more generalizable based on host taxonomy rather than geography, and 3) orthohantavirus host species are disproportionately found in grasslands and disturbed habitats. In Chapter II, I present a prioritized list of rodent species to target for orthohantavirus surveillance based on predictive modeling using machine learning. Probable orthohantavirus hosts were predicted based on traits of known orthohantavirus hosts using two different types of evidence: RT-PCR and virus isolation. Predicted host distributions were also mapped to identify geographic hotspots to spatially guide future surveillance efforts. In Chapter III, I present a framework for understanding and predicting orthohantavirus traits based on reservoir host phylogeny, as opposed to the traditional geographic dichotomy used to group orthohantaviruses. This framework establishes three distinct orthohantavirus groups: murid-borne orthohantaviruses, arvicoline-borne orthohantaviruses, and non-arvicoline cricetid-borne orthohantaviruses, which differ in several key traits, including the human disease they cause, transmission routes, and virus-host fidelity. In Chapter IV, I compare rodent communities and orthohantavirus prevalence among grassland management regimes. Sites that were periodically burned had high rodent diversity and a high proportion of grassland species. However, rodent seroprevalence for orthohantavirus was also highest in burned sites, representing a trade-off in habitat management outcomes. The high seroprevalence in burned sites is likely due to the robust populations supported by the high quality habitat resulting from prescribed burning. In Chapters V and VI, I describe Ozark virus and Sager Creek virus, two novel orthohantaviruses discovered from specimens collected during Chapter IV. Both chapters report full genome sequences of the respective viruses and compare both nucleotide and protein phylogenies with related orthohantaviruses. Additionally in Chapter VI, I support the genetic analyses with molecular and ecological characterizations, including seasonal fluctuations in host abundance, correlates of prevalence, evidence of virus shedding, and information on host cell susceptibility to Sager Creek virus.

Factors That Affect Home Range Of Timber Rattlesnakes (Crotalus Horridus) In Northwest Arkansas, Bannon Gallaher

Graduate Theses and Dissertations

Conservation of animal populations requires knowledge of their habitat and spatial needs. Quantifying spatial requirements involves the analysis of home range. We examined the effects of sex, body size (SVL), body condition (log mass/log SVL), and year on home range in Timber Rattlesnakes (Crotalus horridus) in Northwest Arkansas. Individual locality data from an ongoing, 22+ year radio-telemetry study in Madison Co., Arkansas were analyzed using both minimum convex polygon (MCP) and Kernel Density Estimates (KDE). Plots of the number of sequential observations versus home range (MCP and KDE) determined that a minimum of 25 locations per individual per active season …

Readiness To Lead: Novice School Leaders' Perceptions Of The Impact Arkansas Fellowship Experience On Their Preparedness To Assume School Leadership Roles, Allison Prewitt

Graduate Theses and Dissertations

Research provides increasing evidence that school leadership correlates with school performance (Herman et al., 2016). The leadership skills of K-12 school administrators are linked with student achievement. Evidence indicates that school leaders’ roles continue to evolve as accountability measures change (Grissom et al., 2021). Historically, principal preparation programs emphasized developing management skills. According to research, this is insufficient to prepare instructional leaders for the complex social context of contemporary education (Hernandez et al., 2012; Kerston, 2010; Levine, 2005; Lynch, 2012; Miller, 2013; Zubnzycki, 2013). Unfortunately, most principal preparation programs (PPPs) have not kept pace with the expanding role of principals …

Experienced Nonnative English-Speaking Teachers’ Nonnativeness-Related Challenges, Coping Strategies, And Identity Construction, Roseli Marqueti Matos Franco

Graduate Theses and Dissertations

Kamhi-Stein (1999) declares that little is known about nonnative English-speaking teachers (NNEST) who work in ESL settings also known as Inner Circle countries. Twenty years later, Fan and de Jong (2019) have echoed that view by stating that traditionally research on NNESTs focuses on Teaching English to Speakers of Other Languages (TESOL) international graduate students and that little is known about professional nonnative English-speaking teachers in English-dominant environments such as the U.S.A. Therefore, to try to help fill this gap in the literature, I investigated the lived experiences of English teachers who speak English as an additional language, often called …

Freedom, Abortion, And Hypocrisy: The Effect Of Hypocrisy On Pro-Life Abortion Attitudes, Emily M. Vance

Graduate Theses and Dissertations

Previous research suggests that highlighting the gap between inconsistent values can result in long-term attitude change (Rokeach, 1971), that feeling hypocritical might prompt pro-attitudinal behavior (e.g., Dickerson et al., 1992), and that a reactance decoy makes participants more receptive to subsequent persuasive messages (Schumpe et al., 2020). Drawing from these findings, the purpose of the present study was to investigate whether the impact of induced hypocrisy on pro-life abortion attitudes, an attitude commonly grounded in the value of freedom, depended on a reactance decoy. Consistent with Aronson et al.’s paradigm (1991), participants first publicly advocated for the importance of personal …

Automation Of Life Cycle Assessment, Jacob Hickman

Graduate Theses and Dissertations

An automation program, named Jacob LCA, was created to help perform life cycle assessment (LCA). The program uses a template file to perform controlled and consistently ordered actions with the LCA program, SimaPro, and effectively removes the need for manual user input. It can be set to run using data from one or more life cycle inventory (LCI) files, which allows for rapid iteration and testing of data. It also partially addresses some of the limitations of LCA by establishing a procedure through which temporal and spatial variations in data can be integrated into LCI files and then passed to …

“From An Elephant Into A Ballerina:” The Future Of Higher Education From Senior Leaders At Public Very High Research Institutions, Sarah Cathleen Rice Denison

Graduate Theses and Dissertations

The purpose for conducting the study was to identify how Very High Research university senior leaders at public institutions in the United States described their vision of the future of higher education over the next 25 years. Specifically, the study provided an opportunity for university chancellors and presidents to describe their versions of what the future holds for higher education and how they are preparing for that future. A vision for the future included senior leader’s perspectives on three elements of the university: the university’s mission and purpose, academics, and student services. Their experience in higher education combined with their …

Effects Of Landscape And Yard Features On Mammals In Residential Yards In Northwest Arkansas, Emily Johansson

Graduate Theses and Dissertations

The human footprint is rapidly expanding, and wildlife habitat is continuously being converted to human residential properties. Most wildlife residing in developing areas are displaced to nearby undeveloped areas. However, some animals can coexist with humans and acquire the necessary resources (food, water, shelter) within the human environment. This may be particularly true when development is low intensity, as in suburban yards. Due to the wide variety in how homeowners utilize their yards, they can be considered individually managed “greenspaces.” These yards can provide a range of food (e.g., bird feeders, compost, gardens), water (bird baths and garden ponds), and …

Autonomy And Self-Motivation Among K-12 Learners: An Examination Of Best Practice Research, Current Classroom Practices, And Teacher & Administrator Perspectives, Meghan Scales

Graduate Theses and Dissertations

Are our schools doing enough to create environments where learners are motivated to learn, and can problem solve and be autonomous in their learning? The purpose of this mixed methods study was to examine a sample of schools in Indiana and determine to what extent they are utilizing research-based methods to ensure an environment where learners are motivated and autonomous. Additionally, in school where these methods were identified as lacking, I investigated some of the reasons teachers struggle to implement these practices. Data was collected using classroom observations and teacher focus groups from four participating schools. The results were then …

A Narrative Research Study On How Brazilian Women Executives Build A Sense Of Community And Belonging When Transferred To The United States, Silvia Regina Siqueira

Graduate Theses and Dissertations

According to the American Immigration Council (2021), 14 percent of the United States population is foreign-born. Immigrants have enriched American culture and enhanced our influence in the world. People feel a need to belong and have an inherent desire for deep, lasting, and meaningful connections (Baumeister & Leary, 1995). Research suggests that humans are fundamentally and pervasively motivated by a need to belong and the desire to form and maintain enduring interpersonal attachments (Allen, Kern, Rozek, McInerney & George, 2021). These authors also define immigrants’ sense of belonging in terms of how they make sense of their social identification with …

Improving Classification In Single And Multi-View Images, Hadi Kanaan Hadi Salman

Graduate Theses and Dissertations

Image classification is a sub-field of computer vision that focuses on identifying objects within digital images. In order to improve image classification we must address the following areas of improvement: 1) Single and Multi-View data quality using data pre-processing techniques. 2) Enhancing deep feature learning to extract alternative representation of the data. 3) Improving decision or prediction of labels. This dissertation presents a series of four published papers that explore different improvements of image classification. In our first paper, we explore the Siamese network architecture to create a Convolution Neural Network based similarity metric. We learn the priority features that …

Ecology, Evolution, And Gene Transfer Between Diatoms And Bacteria, Cory B. Gargas

Graduate Theses and Dissertations

Although photosynthetic macro-eukaryotes (i.e., plants) make up the majority of organic biomass on earth, bacteria are the second largest taxonomic group, by biomass. Bacteria are ubiquitous in our environment, living on, and within, man-made surfaces, natural environments, and eukaryotes themselves. The relationship between bacteria and eukaryotes has existed from the very beginning of eukaryotic life in the form of bacterial endosymbioses that resulted in mitochondria and plastids. Other eukaryote–bacteria relationships have evolved since then, ranging from the beneficial (e.g., mutualistic) to harmful (e.g., parasitic or pathogenic). Understanding these eukaryote–bacteria relationships is key to understanding both the evolution of important ecosystem …

Development Of Medical Device For Volume Status Assessment Using Peripheral Venous Pressure, Audra Beneux

Graduate Theses and Dissertations

The severe side effects of acute dehydration and blood loss may be prevented if assessed and treated quickly. As amplifier technology has improved, small peripheral venous pressure (PVP) signals collected using a transducer on an intravenous catheter can be analyzed to monitor patient volume status. This thesis details the development of an embedded system prototype that quickly and accurately assesses volume status using PVP analysis. The volume prediction algorithm classified 10 seconds of PVP data as “dehydrated” or “resuscitated”. The hardware design consisted of four primary areas: analog signal conditioning, processing, user interaction, and power. After data collection, the signal …

Dynamic Risk Trajectories, Community Context, And Juvenile Recidivism, Kevin T. Wolff, Michael T. Baglivio, Jonathan Intravia

Publications and Research

Purpose

While the implementation of risk assessment has expanded, the extent to which there are different trajectories of risk/protective factors among adjudicated youth during supervision in the community remains unanswered. The goal of the current study is to identify the distinct trajectories in dynamic risk and protective factors among youth on probation and assess whether different patterns in risk over time are associated with continued offending.

Method

Group-based trajectory modeling is used to identify distinct trajectories across multiple domains of risk/need. The individual- and neighborhood-level factors associated with these trajectories are then explored, prior to examining their relationship to continued …