Digital Commons Network^™

The United States And Portuguese Angola: Space, Race, And The Cold War In Africa, Alex J. Marino

Graduate Theses and Dissertations

This dissertation is an international history of the role of the United States in the process of decolonization in Angola, a former colony of Portugal. I argue that the United States embraced Portugal, Angola, and neighboring Democratic Republic of Congo as irreplaceable Cold War allies. Decolonization in Africa challenged America’s relationship with all three countries, as competing forces within the American public called for Washington to adopt an anti-colonial, anti- racist ideology, while others demanded their government to support white supremacy at home and abroad. Decolonization in Angola, a protracted liberation struggle that started in 1961 and lasted until 1974, …

The Impact Of Media Algorithms On The Habermassian Public Sphere And Discourse, Kendal Heavner

Graduate Theses and Dissertations

Media algorithms are increasing in use among popular social networking sites (Geiger, 2009).Algorithms are used to sort a users’ social media feed based on relevance and interest rather than content publish time (Geiger, 2009). Widely accepted and recognized as influential in the media sector, algorithms create a highly personalized experience for the individual viewer. However, some scholars argue the specified curation of media based on a user’s personal preferences leads to a “filter bubble,” an online-based self-fulfilling prophecy in which users’ pre-existing opinions are continually reaffirmed. Because of this, this thesis will examine the intersection of algorithms and media theory. …

Artistry In Air: The Story Of The Younkins, Beth Lewis

Graduate Theses and Dissertations

For sixty years, a Northwest Arkansas family has dominated the world of general aviation by drawing upon its wealth of expertise, innovation and exceptional talent. Jim Younkin, an electrical engineer, invented an autopilot series that revolutionized the industry. His son, Bobby became one of the top aerobatic pilots in the world and Jim’s grandchildren, Matt and Amanda, also became critically acclaimed performers in the air show business. Like his father, Matt is ranked among the best of pilots in the industry. Jim also received national recognition for his stunning recreations of and restorations of historical aircraft. Bobby operated Younkin Airshows, …

Self-Deceive And Conquer: A Rhetoric Of Cunning, David Manuel Cajias

Graduate Theses and Dissertations

The purpose of this investigation is to determine the role that self-deception plays in helping demagogues deceive or manipulate their audiences while remaining unaccountable. I will examine the ways in which self-deception aids demagogues and other unethical rhetoricians compellingly present their deceptive belief systems. This is done in a way that their beliefs are only unconsciously known to be false, inaccurate, or incomplete. As this knowledge is subconsciously stored and concealed from the demagogue’s conscience, I will argue that self-deception is the missing piece in the puzzle that is demagoguery.

Demagogic rhetoric has recently experienced a revival due to the …

Community And Idolatry: San Francisco Cajonos, Yalalag, And Betaza Through The Criminal Court Of Villa Alta, 1700-1704, Jessica Mitchell

Graduate Theses and Dissertations

The trials of San Francisco Cajonos and Betaza and Yalálag heard in Villa Alta’s criminal court depict many important facets of life in Colonial Oaxaca, and they especially paint the picture of community, how it was defined and how it operated in reality. Looking specifically at these two rich examples in Villa Alta’s criminal court, at the time, idolatry – native religion, rituals, and devotions defined by Catholics as idolatrous -- helped shape the lines of community and defined who belonged in which space. It also highlights how betrayal and revenge were construed by a community and the response for …

Electrochemical Oxidation Of Individual Silver Nanoparticles: Exploring The Effect Of Particle Shape, Capping Ligand, Electrolyte, And Potential On The Signal, Jazlynn Sikes

Graduate Theses and Dissertations

Nanomaterials have revolutionized science and technology. Their unique properties can be exploited, and nanoparticles are being used as catalysts, antimicrobials, drug delivery vehicles, sensors, and more. However, the fundamental properties of nanomaterials and their interactions with their surrounding environments are still poorly understood. In this work, a single-particle approach was used to observe the effects of capping ligand, surrounding solution, and particle shape on the oxidative process to gain deeper understanding of silver nanoparticle properties. When allowed the opportunity, the particles will adsorb to the electrode surface then oxidize in rapid succession upon electrode activation, regardless of capping ligand as …

Recovering From Substance Abuse In Arkansas: The Accessibility And Affordability Of Drug Treatment Programs, Whitney King

Graduate Theses and Dissertations

This thesis is going to examine how people recover from drug addiction and see if there are any similarities due to their socioeconomic statuses at the time of recovery. This research addresses the following questions: How accessible and affordable are drug addiction recovery programs and rehabilitation facilities in Arkansas for mid- to low-income individuals? What are the social costs for people who can’t obtain drug rehabilitation services? The goal of this research is to explore whether there is a lack of affordable recovery programs in the state of Arkansas. This project utilizes survey responses as well as in-depth interviews with …

Developing A Microdialysis Sampling-Based Biofilm/Macrophage Co-Culture Model, Alda Diaz Perez

Graduate Theses and Dissertations

The host immune system and bacterial cells are known to interact during the human lifetime. Bacteria secrete a wide variety of signaling molecules, known as quorum sensing (QSC) molecules, that modulate the host immune system. While immune-biofilm interactions involve this chemical signaling network, the mechanisms through which this occurs are not well understood. This work aimed to develop a new method that can be used not only in vitro settings but also in vivo. The microdialysis sampling technique has widely been used in in vitro and in vivo settings in humans, mice, and rats for the collection of neuropeptides, cytokines, …

Achieving Differential Privacy And Fairness In Machine Learning, Depeng Xu

Graduate Theses and Dissertations

Machine learning algorithms are used to make decisions in various applications, such as recruiting, lending and policing. These algorithms rely on large amounts of sensitive individual information to work properly. Hence, there are sociological concerns about machine learning algorithms on matters like privacy and fairness. Currently, many studies only focus on protecting individual privacy or ensuring fairness of algorithms separately without taking consideration of their connection. However, there are new challenges arising in privacy preserving and fairness-aware machine learning. On one hand, there is fairness within the private model, i.e., how to meet both privacy and fairness requirements simultaneously in …

Sex-Based Differences In Acvr2b And Grb10 Expression In Skeletal Muscle During Induced Cancer Cachexia And Disuse, Lauren Martinez

Graduate Theses and Dissertations

Background: Muscle atrophy is the shrinkage of muscle fibers that are largely maintained by a balance of protein synthesis and degradation. Imbalances in protein synthesis and degradation are observed in different muscle atrophy disorders such as cancer cachexia and disuse. These forms of muscle atrophy produce distinct wasting pathologies that are influenced by biological sex. Activin receptor type-2B (ACVR2B) and Growth factor receptor-bound protein 10 (GRB10) have been identified as genes that potentially regulate muscle mass while also displaying sexually dimorphic differences. Purpose: To examine the influence of ACVR2B and GRB10 throughout the development of cancer cachexia and disuse-induced atrophy …

Design And Assembly Of High-Temperature Signal Conditioning System On Ltcc With Silicon Carbide Cmos Circuits, Sajib Roy

Graduate Theses and Dissertations

The objective of the work described in this dissertation paper is to develop a prototype electronic module on a low-temperature co-fired ceramic (LTCC) material. The electronic module would perform signal conditioning of sensor signals (thermocouples) operating under extreme conditions for applications like gas turbines to collect data on the health of the turbine blades during operation so that the turbines do not require shutdown for inspection to determine if maintenance is required. The collected data can indicate when such shutdowns, which cost $1M per day, should be scheduled and maintenance actually performed. The circuits for the signal conditioning system within …

Biopolymeric Materials For Tissue Regeneration, Cell Manufacturing, And Drug Delivery, David Alfonso Castilla-Casadiego

Graduate Theses and Dissertations

The development of materials for tissue regeneration, cell manufacturing, and drug delivery is possible by the manipulation of polymer properties and the use of three different techniques including layer-by-layer, electrospinning, and molding technique.

By applying the layer-by-layer technique over biomaterials, it is possible to develop polymeric multilayers that promote a more favorable environment for cellular functionality, increasing the possibility of improving their acceptance in the area of implantation. IRVASE demonstrated being a powerful technique that allows for a reliable characterization of the physical-chemical and thermal properties of the fabricated surfaces. This opens the possibility to monitor the design of surfaces …

Network-Based Detection And Prevention System Against Dns-Based Attacks, Yasir Faraj Mohammed

Graduate Theses and Dissertations

Individuals and organizations rely on the Internet as an essential environment for personal or business transactions. However, individuals and organizations have been primary targets for attacks that steal sensitive data. Adversaries can use different approaches to hide their activities inside the compromised network and communicate covertly between the malicious servers and the victims. The domain name system (DNS) protocol is one of these approaches that adversaries use to transfer stolen data outside the organization's network using various forms of DNS tunneling attacks. The main reason for targeting the DNS protocol is because DNS is available in almost every network, ignored, …

In His Name: White Evangelicals, The Republican Party, And Their Support And Endorsement Of Donald Trump – Documentary Podcast, Matthew Moore

Graduate Theses and Dissertations

The purpose of this project is to provide historical context to the rise of White Evangelicals political involvement in the United States and how it evolved to support and endorse Donald Trump for president in the 2016 election. Three major factors led to this: White Christian Nationalism, traditional family values, and racial resentment. The podcast is a story told in three parts, addressing the history of these elements starting before America was even a nation to today. This project seeks to address the past, acknowledge what led to Donald Trump’s election in 2016, and reckon with White Evangelicals ought to …

The Impact Of Funds Of Knowledge Instruction In Career And Technical Education Among Junior High Students: A Mixed Methods Study, Sheri D. Deaton

Graduate Theses and Dissertations

The purpose of this mixed methods study was to investigate students’ perceptions of their own Funds of Knowledge (FOK) and the impact that these funds have as students prepare for careers. This purpose was achieved through an embedded mixed methods design with qualitative data collection and analysis embedded within the quantitative research design. Analysis of data collected in a Career and Technical Education (CTE) classroom from the pre and post assessment instrument reveal that while direct instruction regarding FOK did not result in a statistically significant difference between the control and treatment groups, post assessment scores for participants in the …

Quantifying The Leaching Of Nutrients And Metals In A Pasture Soil As Affected By Excreta Of Ruminants Fed Alternative Diets, Ian Kennedy

Graduate Theses and Dissertations

The leaching of nitrate through the soil profile and into adjacent water systems has been a leading cause of water pollution and results in the loss of a valuable nutrient from animal production systems. Forage-based animal production systems may be improved through manipulation of animal diets that incorporate tannins and total polyphenolic compounds with feed, increasing the amount of nitrogen (N) retained by an animal/decreasing rates of digestion and altering the N-containing compounds that are excreted and deposited onto soil. Incorporating the forage legumes sericea lespedeza (Lespedeza cuneate [Dumont de Courset] G. Don) and lablab (Lablab purpurues L.) into the …

Characteristic Reassignment For Hardware Trojan Detection, Noah Waller

Graduate Theses and Dissertations

With the current business model and increasing complexity of hardware designs, third-party Intellectual Properties (IPs) are prevalently incorporated into first-party designs. However, the use of third-party IPs increases security concerns related to hardware Trojans inserted by attackers. A core threat posed by Hardware Trojans is the difficulty in detecting such malicious insertions/alternations in order to prevent the damage. This thesis work provides major improvements on a soft IP analysis methodology and tool known as the Structural Checking tool, which analyzes Register-Transfer Level (RTL) soft IPs for determining their functionalities and screening for hardware Trojans. This is done by breaking down …

Adhesion And Deformation Mechanisms Of Polydopamine And Polytetrafluoroethylene: A Multiscale Computational Study, Matthew Brownell

Graduate Theses and Dissertations

Polydopamine (PDA) has been shown to bond via covalent bonding, van der Waals forces, and hydrogen bonding and is known to adhere strongly to almost any material. The application of PDA between a substrate and a PTFE surface coating has resulted in low friction and a greatly reduced wear rate. Previous research probing the capabilities and limitations of PDA/PTFE films have studied the wear and mechanical properties of the film, but the overall adhesive and deformation mechanisms remain unclear.

In this research, we investigate the tribological properties of PDA and PTFE molecules and composites from the atomic to the microscale …

Parallel Strategies To Control Bacterial Panicle Blight Of Rice, Laura Ortega

Graduate Theses and Dissertations

Bacterial Panicle Blight (BPB) of rice is a seed-borne disease caused by the bacterium Burkholderia glumae. This disease has affected rice production worldwide and its effects are likely to become more devastating with the continuous increase in global temperatures especially during the growing season. Field data has shown that the disease has been more prevalent in years when the temperatures have been unusually high especially at night possibly due to the bacterial adaptation to grow at temperatures higher than 40oC. With the continuous rise in global temperatures, it is likely that this disease will be more problematic. The bacterium can …

Numerical Simulations Of Directed Self-Assembly Methods In Di-Block Copolymer Films For Efficient Manufacturing Of Nanoscale Patterns With Long-Range Order, Joseph Hill

Graduate Theses and Dissertations

Directed self-assembly (DSA) of block copolymers (BCPs) has been shown as a viable method to achieve bulk fabrication of surface patterns with feature sizes smaller than those available through traditional photolithography. Under appropriate thermodynamic conditions, BCPs will self-assemble into ordered micro-domain morphologies, a desirable feature for many applications. One of the primary interests in this field of research is the application of thin-film BCPs to existing photolithography techniques. This “bottom-up” approach utilizes the self-assembled BCP nanostructures as a sacrificial templating layer in the lithographic process.

While self-assembly occurs spontaneously, extending orientational uniformity over centimeter-length scales remains a critical challenge. A …

A Methodological Framework To Evaluate Community Perceptions Of Economic And Safety Impacts Attributed To Highway Bypass And Widening Projects, Karla Diaz-Corro

Graduate Theses and Dissertations

Transportation practitioners have proposed the construction of highway bypass and widening projects in rural communities to address traffic-related problems that include noise pollution and congestion, among others. In the past, the construction of bypass projects has led community residents to raise concerns about potential decreases in business activity for businesses located along the bypassed road. For transportation organizations, it is essential to understand the economic, social, and safety impacts of transportation projects in terms of public perceptions as public input is a required part of the project planning phase. Moreover, it is recommended that agencies perform retrospective analyses of project …

Resistance To Herbicides Conferred By Amaranthus Palmeri Protoporphyrinogen Ix Oxidase Mutations, Pamela Carvalho De Lima

Graduate Theses and Dissertations

Palmer amaranth (Amaranthus palmeri S. Wats.) is one of the most problematic agronomic weeds to control in fields across Arkansas. Thus far, this species has evolved resistance to several herbicides, including protoporphyrinogen IX oxidase (PPO) inhibitors. The majority of PPO-resistant Palmer amaranth populations harbor a target-site mutation (substitution or deletion of amino acids). The objective of this thesis was to identify the level of fomesafen resistance conferred by PPO2 mutations from Palmer amaranth. The experiments conducted aimed to (1) characterize the level of resistance conferred by the transgene Palmer amaranth ppo2 carrying ΔG210 mutation into the wild type rice (Oryza …

A Snapshot Semester: Students’ Reflections Of Performance And Mental State Throughout A Graduate Course, Bradley D. Borges

Graduate Theses and Dissertations

Graduate students are anecdotally reputed to be among the most stressed groups of young adults. Common sources of stress for graduate students have included coursework, assistantships, finances, career preparation, and family (Wyatt & Oswalt, 2013; Mazzola, Walker, Shockley & Spector, 2011; Oswalt & Riddock, 2007). Guided reflection can be used by educators to assist students in both learning (Boud, Keogh & Walker, 2013; Kolb, 1984) and managing stress (Shoulders, Whitehead, & Morrison, 2018). By understanding how students’ progress through a semester in terms of both their learning and their management of stress, instructors and academic advisors can better anticipate times …

Implications Of Lysine Acetylation On The Enzymes Of The Tca Cycle, Sumana Venkat

Graduate Theses and Dissertations

The tricarboxylic acid (TCA) cycle is a central route for the energy production via oxidative phosphorylation and is ubiquitous throughout nature. Apart from playing a major role in energy provision, it is also essential for a wide range of physiological functions in any organism. Although an increasing emphasis is laid on the interlinking role of the cycle, its regulation and control are less very less understood. As the field progresses, the consequences of TCA cycle anomalies are shown to be tied to various cancers and other disorders. The matter becomes more complex when considering the varying functions of the isozymes …

Conditional Distance Correlation Test For Gene Expression Level, Dna Methylation Level And Copy Number, Shanshan Zhang

Graduate Theses and Dissertations

Over the past years, efforts have been devoted to the genome-wide analysis of genetic and epigenetic profiles to better understand the underlying biological mechanisms of complex diseases such as cancer. It is of great importance to unravel the complex dependence structure between biological factors, and many conditional dependence tests have been developed to meet this need. The traditional partial correlation method can only capture the linear partial correlation, but not the nonlinear correlation. To overcome this limitation, we propose to use the innovative conditional distance correlation (CDC), which measures the conditional dependence between random vectors and detect nonlinear relations. In …

Insider Trading Enforcement And The Private Information Environment: Evidence From The Newman Ruling, Andrew T. Pierce

Graduate Theses and Dissertations

I exploit a shock to U.S. insider trading law to investigate whether a reduction in the enforceability of tipper-tippee insider trading restrictions leads to changes in information parity among investors and the efficiency of price discovery. The December 2014 Federal Second Circuit Court of Appeals ruling in US v. Newman constrained enforcement by restricting the types of exchanges between managers and investors that trigger tipper-tippee insider trading liability. Following Newman, I find that Second Circuit hedge funds experienced a significant increase in their stock picking ability of Second Circuit stocks in terms of preempting future earnings announcement returns and future …

Development And Characterization Of Metal Contacts For Graded Composition Ingan Solar Cells, Reem E. Alhelais

Graduate Theses and Dissertations

There is an increasing demand for high-power electronic components and optoelectronic devices with low-loss and high efficiency. III-nitride semiconductor materials have demonstrated great potential for high-power, high-frequency, and high-temperature applications because of their remarkable and wide-ranging electronic and physical properties. These material systems, including alloys of AlN, GaN, and InN, are currently being explored for their potential to develop efficient photovoltaic cells. They can potentially achieve higher efficiency because of their very high direct wide band edge, absorption coefficients, and resistance to defects. The compositionally graded Group III-nitride alloy allows access to a large range of energies by varying the …

A Peaceful End? Exploring The Correlates Of When Terrorist Groups Negotiate, William Berry

Graduate Theses and Dissertations

Despite significant advances in the terrorism literature since the September 11th attacks, there remains very little research into the processes by which terrorism might come to a peaceful end. The present study addresses this gap in the literature by investigating politicization, a process by which terrorist organizations negotiate with authorities and the two parties enter a peace agreement or otherwise agree to cease hostilities. The study explores the politicization outcome as predicted by important organizational and behavioral characteristics that prior literature identifies as affecting how terrorist groups end, including group size, organization lifespan, target type for terroristic activities, and the …

The Effects Of Implementing The National Guard Tuition Assistance Program On Accessing Higher Education Funds For Arkansas National Guardsmen At The University Of Arkansas, Erika Gamboa

Graduate Theses and Dissertations

The Arkansas National Guard Tuition Assistance (NGTA) program was created to recruit and retain Arkansas National Guardsmen by providing college funding regardless of Armed Services Vocational Aptitude Battery (ASVAB) test scores. The funding provided up to 100% of tuition costs at any Arkansas public college or university and was effective between Fall 2017 to Fall 2019. The approval process included collaboration between the Arkansas National Guard Education Office, the Arkansas Department of Higher Education, and the institution of higher education Guardsmen attended.

The study focused on the effects the NGTA had on Guardsmen who attended the University of Arkansas during …

Baby Boomers In Technology-Rich Environments: Using Piaac To Study The Association Of Workplace Learning With Technology Competency, Julie M. Galliart

Graduate Theses and Dissertations

A skill gap in Problem Solving in Technology-Rich Environments (PS-TRE) between U.S. Baby Boomers and younger generations has been documented in previous studies using the Programme for the International Assessment of Adult Competencies (PIAAC) Survey of Adult Skills (Rampey et al., 2016). Bringing this generation of workers up to speed in this competency area is important because older workers are a growing segment of the U.S. workforce with 13 million employees expected to be age 65 or older by 2024 (Toossi & Torpey, 2017). Workplace learning may be a solution, but few studies in adult learning document outcomes of training …