Digital Commons Network^™

Gaas Growth On Sapphire Substrates (C And R Plane) For Integrated Microwave Photonics (Imwp), Samir Kumar Saha

Graduate Theses and Dissertations

The microwave signal processing in the optical domain creates new opportunities for information and communication technology (ICT) and networks by increasing speed, bandwidth, and processing capability. IMWP incorporates the functions of microwave photonics components/subsystems in monolithic or hybrid photonic circuits to meet future needs. Sapphire platforms have the potential to integrate all-in-one, for instance, light source, analog signal processing, light detection, CMOS control circuit, silicon on sapphire to achieve high-performance, low-cost mixed-signal optical links etc. Molecular beam epitaxy (MBE) has been used to grow GaAs on sapphire substrates to integrate optoelectronic devices in the same platform.

The initial stage of …

Symbolism Or Substance: Factors Influencing Campus Messaging Decisions And Their Alignment With Institutional Values, Laura Herzog Jacobs

Graduate Theses and Dissertations

Historically, institutions of higher education (IHE) have been cautious and slow in making changes. Yet in today’s fast-paced and dynamic world of content availability and information flow generated by 24-hour news cycles and the ubiquity of social media present a challenging reality for colleges and universities in their public relations and communications approaches (Sands & Smith, 2000). Creating a harmonious and agile approach to managing these responsibilities against the backdrop of an incessant flow and public demand for information, including responses to national events often with seemingly little or no connection to the institution, suggested a need to examine the …

The Effects Of Watching Text-Relevant Video Segments On Reading Comprehension Of Culturally Unfamiliar Texts With Adult English Language Learners Supported By The Schematic Information-Processing (Sip) Model Of Reading Comprehension, Amirreza Karami

Graduate Theses and Dissertations

The purpose of this mixed-methods sequential explanatory study was to investigate the effects of watching text-relevant video segments on reading comprehension of a culturally unfamiliar text when technical words are present or absent. Therefore, 44 adult English Language Learners (ELLs) with higher-intermediate to advanced English language proficiency levels from the Universidad Autónoma de Santo Domingo (UASD) School of Languages located in the Dominican Republic were chosen and randomly assigned to two different groups: control vs. experimental.

First, the researcher compared two different types of reading instruction—traditional text-based vs. video-based reading instruction supported by the Schematic Information-Processing (SIP) model of reading …

Teacher And Staff Perception Of School Climate: A Case Study, Michael Shane Hampton

Graduate Theses and Dissertations

The purpose of this study is to determine how different public-school teachers and staff perceive school climate at an achieving public middle school. The research sought to find relationships between teacher sub-groups and other staff members, and how they perceived the school climate, either negatively or positively. The researcher believed that there would be a positive perception of school climate, which coincided with high student achievement. Additionally, it was believed that there would be no relationship between teacher types or demographics, and how the climate would be perceived among the different groups. This paper also presents a review of the …

Site-Specific Effects Of Lysine Acetylation On Aminoacyl-Trna Synthetase, Hao Chen

Graduate Theses and Dissertations

Aminoacyl-tRNA synthetases (AARSs) are an ancient and highly conserved family of enzymes which can catalyze a two-steps aminoacylation reaction to charge tRNAs with their cognate amino acids, thus playing crucial roles in ribosomal protein synthesis. Naturally, the accurate amino acids and tRNA recognition of these synthetases are essential to the fidelity of translation process. To assure the correct recognition, some of these synthetases have evolved with an editing function to help remove the mischarged tRNAs. In addition to these functions, AARSs are also involved in various biological processes ranging from transcription to translation. Currently, a series of proteomic studies have …

Analysis Of Bacteriorhodopsin Suspended In A Bilayer Lipid Membrane, Moath Alhejji

Graduate Theses and Dissertations

The bacteriorhodopsin protein’s unique characteristic of proton pumping can convert light energy to electric energy. The aim of this research was to generate photocurrent using bacteriorhodopsin in a bi-layer lipid membrane. Lipid monolayer and bilayer were formed using painting and folding methods, respectively. Capacitance and resistance of the lipid membranes were measured and used to validate the best methodology. My results show that the folding method is more efficient in incorporating Bacteriorhodopsin. The photocurrent was generated by illuminating a green laser (532 nm) on the bilayer lipid membranes. The patch clamp electrophysiology technique was used to apply voltage across the …

Stress Among Ncaa Division Ii Head Coaches, Dee Gerlach

Graduate Theses and Dissertations

The purpose of this quantitative study was to identify factors that create stress among head coaches at the National Association Athletic Association Division II level. Data was collected through a demographic questionnaire and the Coaching Issues Survey (CIS), a tool used to measure specific factors that may create stress among coaches. The factors of the CIS include four subscales: Athlete-Concerns, Time-Role, Program-Success, and Win-Loss. Participants (N=416) consisted of head coaches representing the following sports: baseball, men’s basketball, women’s basketball, men’s golf, women’s golf, men’s and women’s golf, softball, women’s tennis, and men’s and women’s tennis. The independent variables for this …

Investigation Of Iron-Nickel Films Based Catalysts: Controlling Hydrogen Evolution Reaction (Her) Through An Electrode-Electrolyte Engineering Approach, Sergio Ivan Perez Bakovic

Graduate Theses and Dissertations

Electrochemical energy conversion technologies need to be economically viable in order to be adopted. Earth-abundant transition metals (i.e., Fe, Co, and Ni) have attracted attention due to their high availability, low cost, and catalytic characteristics that are in many cases found in and exploited by nature. Herein, we synthesize FexNi100-xOy electrocatalyst films and study how the electrocatalyst-electrolyte interactions alter the hydrogen evolution reaction (HER).In this work, FexNi100-xOy films were synthesized to study the composition, chemical state, and morphology. Characterization results provided a well-established electrocatalyst film platform to then proceed with electrochemical evaluations. The effects of the electrode composition and electrochemically …

A Case Study Of Eastern Region Arkansas Promise Participants And Their Expectations For The Future, Robin Freeman

Graduate Theses and Dissertations

The purpose of this study was to develop an in-depth understanding of how Eastern Arkansas youth with disabilities and their parents describe their expectations for the future, after participating in the Arkansas PROMISE program. The study sought an understanding of how participants viewed themselves and their expectations for the future, for employment, for participation in higher education, for independent living, and for future financial support. The research used a case study approach, interviewing five students and five parent participants. Participants were asked a series of questions to get an understanding of their experiences, their expectations for the future, and their …

Catalytic Activity Of Molybdenum-Dioxo Complexes, Randy Tran

Graduate Theses and Dissertations

This dissertation details the development of rationally designed dioxomolybdenum catalyst active for deoxydehydration (DODH), the net reduction of diols and polyols into alkenes and dienes. Catalyst design involved variations on dioxomolybdenum(VI) supported by a dianionic meridional pincer ligand. Rational substrate scope was explored using aliphatic diols, aromatic diols, and biomass derived diols. Various reductants were tested for ability to catalyze the reaction. The substrate specific mechanism of DODH was explored utilizing NMR and in-situ infrared spectroscopy and important rate constants and rate determining steps were found to aid in the optimization of ideal reaction conditions. Catalytic activity was observed to …

How Are Agricultural Research Projects Conceiving Innovation? An Assessment Of The European Union Multi-Actor Projects, Samuel Brea Martinez-Collado

Graduate Theses and Dissertations

Horizon research programs are the European Union’s lighthouse for innovation and research concerning the agri-food chain, the management of natural resources, and the bioeconomy. Their innovation strategy approach is one that pursues the practical application of the research via the collaboration of all actors involved. Such strategy is the reflection of a Multi-Actor Approach as their procedure to enhance innovation. This paper presents the main trends and directions 101 Multi-Actor Projects (MAPs) are following on said approach towards innovation. The analysis is based on the use of well-defined “pathways” and “measures” proposed in the Guidelines for Evaluation of Innovation in …

Examining The Relationship Between Library Services Use And Fall-To-Fall Retention In Community College Libraries, Eric Deatherage

Graduate Theses and Dissertations

Community college libraries exist to support institutional outcomes. One such outcome is student retention. This study’s purpose was to fill the gap in the literature at the community college level, proposing that a model including all library service use types would explain variance in student retention beyond that explained by total library financial expenditure. Services included were numbers of physical materials circulated, digital books circulated, e-serials used, reference transactions, library presentations, attendees at presentations, gate counts, and interlibrary loan materials borrowed. Additionally, it was proposed that the relationship between gate counts of physical entry into the library and student retention …

A Focused Evaluation Of Sales Employees' Ethics Training And Its Effect On The Diffusion Of Ethics In A Financial Organization, Justin Luebker

Graduate Theses and Dissertations

Ethical scandals have continued to batter corporate America into the twenty-first century. Companies such as Enron and MCI WorldCom became household names overnight because of ethical issues that shuttered the organizations’ operations and stunned shareholders. Training has served as a primary mechanism for companies to impart ethical values in employees and leadership teams. However, despite the ongoing focus and resources dedicated to education and associate development in this area, historically there appears to be no diffusion of ethical standards within organizations. There is a lack of consensus in current research regarding the effectiveness of organizational ethics training and its ability …

Component Damage Source Identification For Critical Infrastructure Systems, Nathan Davis

Graduate Theses and Dissertations

Cyber-Physical Systems (CPS) are becoming increasingly prevalent for both Critical Infrastructure and the Industry 4.0 initiative. Bad values within components of the software portion of CPS, or the computer systems, have the potential to cause major damage if left unchecked, and so detection and locating of where these occur is vital. We further define features of these computer systems and create a use-based system topology. We then introduce a function to monitor system integrity and the presence of bad values as well as an algorithm to locate them. We then show an improved version, taking advantage of several system properties …

Sigesn Light-Emitting Devices: From Optical To Electrical Injection, Yiyin Zhou

Graduate Theses and Dissertations

Si photonics is a fast-developing technology that impacts many applications such as data centers, 5G, Lidar, and biological/chemical sensing. One of the merits of Si photonics is to integrate electronic and photonic components on a single chip to form a complex functional system that features compact, low-cost, high-performance, and reliability. Among all building blocks, the monolithic integration of lasers on Si encountered substantial challenges. Si and Ge, conventional epitaxial material on Si, are incompetent for light emission due to the indirect bandgap. The current solution compromises the hybrid integration of III-V lasers, which requires growing on separate smaller size substrates …

Material Detection With Thermal Imaging And Computer Vision: Potentials And Limitations, Jared Poe

Graduate Theses and Dissertations

The goal of my masters thesis research is to develop an affordable and mobile infraredbased environmental sensoring system for the control of a servo motor based on material identification. While this sensing could be oriented towards different applications, my thesis is particularly interested in material detection due to the wide range of possible applications in mechanical engineering. Material detection using a thermal mobile camera could be used in manufacturing, recycling or autonomous robotics. For my research, the application that will be focused on is using this material detection to control a servo motor by identifying and sending control inputs based …

Systematics Of Eastern North American Podothrombium (Parasitengona: Podothrombiidae), Kelsey Lynn Cline

Graduate Theses and Dissertations

Velvet mites of the genus Podothrombium Berlese, 1910 are found worldwide with only two described species known from North America, both occurring on the west coast. The present study describes five new species occurring in the east, from both larval and post-larval stages. Species hypotheses are supported with morphology and analysis of mitochondrial (barcoding region of COI) and nuclear genes (D2-3 expansion regions of 28S rDNA). Specimens are incorporated from the Barcode of Life Data Systems (BOLD), allowing our dataset to span most of North America. Therefore, we were able to raise the number of Podothrombium in North America from …

The Systemic Punches: Displacement Experience Of Vulnerable Immigrants, Eric Andre

Graduate Theses and Dissertations

"The Systemic Punches: Displacement Experience of Vulnerable Immigrants" focuses on the impact of systems of state control such as immigration laws, policies, and practices that have been institutionalized and that have marginalized immigrants. In my thesis, I pay specific attention to inhuman acts of exclusion and discrimination resulting from the systemic barriers perpetuated by xenophobic and nationalist ideologies.

From this standpoint, my thesis exhibition employs interactive space, which includes visual art (drawing, sculpture ceramics), projection, video, and sound, as a means to explore the effects of the exclusive and discriminatory immigration policies and practices. Furthermore, it is designed to explore …

2+2=Cake: A Book Of Conversations About Possibilities In Business And Art, Elizabeth Ann Alspach

Graduate Theses and Dissertations

2+2=CAKE is a toolkit for people interested in creating their own economic container to support their livelihood. Calling upon the entrepreneurial experience of artists and creatives who founded or run organizations, the book and accompanying workbook and motivational posters serve as an incubator, buoy, and affirming resource for those looking to build the economic container in which they make their livelihood.

Computational Frameworks For Multi-Robot Cooperative 3d Printing And Planning, Laxmi Prasad Poudel

Graduate Theses and Dissertations

This dissertation proposes a novel cooperative 3D printing (C3DP) approach for multi-robot additive manufacturing (AM) and presents scheduling and planning strategies that enable multi-robot cooperation in the manufacturing environment. C3DP is the first step towards achieving the overarching goal of swarm manufacturing (SM). SM is a paradigm for distributed manufacturing that envisions networks of micro-factories, each of which employs thousands of mobile robots that can manufacture different products on demand. SM breaks down the complicated supply chain used to deliver a product from a large production facility from one part of the world to another. Instead, it establishes a network …

Data-Driven Methods To Address Truck Parking Shortages For Long-Haul Commercial Truck Drivers, Sharif Mahmud

Graduate Theses and Dissertations

Truck parking is a critical concern for both the trucking industry and the truck drivers. Long-haul commercial truck drivers rely on safe and adequate parking to support interstate commerce, which has become a challenge due to parking shortages. The recent electronic logging device (ELD) mandate, forcing a strict compliance to hours of service (HOS) regulations, are leading to higher demand for parking. A number of federal, regional, and local studies reveal that truck activity will increase and truck parking demand will outpace parking supply in the coming years. Such parking shortages likely disrupt freight flows and pose risks to truck …

Mitigating Calcium Oxychloride Damage In Cementitious Paste And Concrete Utilizing Supplementary Cementitious Materials, Casey Jones

Graduate Theses and Dissertations

It is understood among engineers in the United States (U.S.) that improvement is needed throughout the transportation infrastructure. In the 2021 Infrastructure Report Card produced by the American Society of Civil Engineers, the roadways of this nation merit a D. This leaves room for improvement in order to provide durable pavements throughout this nation. Areas with significant winter weather may have exacerbated effects in decreased roadway longevity due to freezing/thawing cycles and the use of chemical deicers to mitigate gelid roadway conditions. Much research focuses on surface scaling and reinforcement corrosion using these materials; however, joint deterioration, due to chemical …

The Plexiglass Ceiling: Exploring Systemic Racism And Sexism In Public Leadership Positions, Kaylin Oliver

Graduate Theses and Dissertations

The numbers of black women who hold leadership positions within public institutions are not correspondingly reflective of their overall numbers within public institutions. The focus of this study is to examine how race and gender discrimination prohibits black women from obtaining leadership positions in public institutions.. I propose a new theory Workplace Intersectional Infringement Theory (WIIT) to increase the efficacy of the study on black women in Public Institutions. Using snowball sampling, I conduct interviews with 11 black women who hold leadership positions across a variety of public institutions within the United States. I found a majority of the participants …

Preferred Methods Of Communication Of Millennial Alumni Of The University Of Arkansas’ Agricultural Education, Communications And Technology Department And The Impact Of Brand Community On Potential Philanthropy, Wells William Clark

Graduate Theses and Dissertations

Higher education institutions depend upon alumni support (Gaier, 2005). Understanding how those institutions communicate with alumni about methods of financial giving is necessary in securing their support. The concept of brand community, an idea formed through social relationships amongst consumers of a common brand, regardless of location, who acknowledge their overlapping interests and share traditions and a sense of duty related to the brand (McAlexander et al., 2006; Muniz & O’Guinn, 2001), can contribute to desired behaviors such as donations and engagement in alumni groups. Exploration of this concept was conducted in relation to young alumni (those graduating from 2008-2018).The …

Evaluating Bioenergetics And Mitochondrial Dynamics In Patient Fibroblasts With Pathogenic Mitochondrial Dna Mutations Causing Leigh Syndrome, Ajibola Bakare

Graduate Theses and Dissertations

Leigh syndrome (LS) is a rare fatal mitochondrial disorder of infants caused by pathogenic mutations in the nuclear (nDNA) or mitochondrial DNA (mtDNA) leading to mitochondrial dysfunction. The extent to which pathogenic mtDNA variants regulate disease severity in LS is not well understood. The heterogeneous nature of this disorder, based in part by complex mitochondrial genetics, and the nuclear and mitochondrial cross-talk has made it particularly challenging to investigate and develop therapies for treating LS . While the prognosis is poor, several studies are underway to understand the pathophysiology of LS. This dissertation provides a comprehensive structural and functional analysis …

Child-Centered Play Therapy’S Impact On Externalized Behaviors Of Children Who Have Experienced Trauma: A Single-Case Research Design, Timothy "T.J." Schoonover

Graduate Theses and Dissertations

Adverse childhood experiences (ACEs) are defined as exposure to emotional abuse, physical abuse, sexual abuse, emotional neglect, physical neglect, loss of a parent, domestic violence, family member with addiction, family member with depression or mental illness, and family member incarcerated (Felitti et al., 1998). ACEs have been studied for many years and have shown to have long term negative health and social-emotional outcomes and costs the world over $1 trillion a year (Bellis et al., 2019; Felitti et al., 1998; Hughes et al., 2017). Due to the emotional, physical, and dollar amount cost to not addressing the impact of ACEs …

Signal Processing And Data Analysis For Real-Time Intermodal Freight Classification Through A Multimodal Sensor System., Enrique J. Sanchez Headley

Graduate Theses and Dissertations

Identifying freight patterns in transit is a common need among commercial and municipal entities. For example, the allocation of resources among Departments of Transportation is often predicated on an understanding of freight patterns along major highways. There exist multiple sensor systems to detect and count vehicles at areas of interest. Many of these sensors are limited in their ability to detect more specific features of vehicles in traffic or are unable to perform well in adverse weather conditions. Despite this limitation, to date there is little comparative analysis among Laser Imaging and Detection and Ranging (LIDAR) sensors for freight detection …

Understanding The Importance Of Ambition In The Workplace, Jeff Bean

Graduate Theses and Dissertations

Though a common term, ambition is a multifaceted concept that is vastly under researched despite it being labeled necessary for success in the workplace. Of even greater irony is that several sources indicate a significant majority of the reason that employees leave organizations is due to a perceived lack of career development or opportunity, a problem that speaks directly to talent management practices. In light the costly nature of this problem and the presence of sophisticated talent management professionals in large and medium-sized organizations which comprise half or more of the workforce, it causes one to question the assumptions that …

Nanomaterial-Based Biosensors For Detection Of Salmonella Typhimurium And Avian Influenza Virus H5n1 In Poultry, Xinge Xi

Graduate Theses and Dissertations

This research focused on developing biosensing method and biosensing device for rapid detection of pathogens in poultry: Salmonella Typhimurium and avian influenza virus H5N1. The first part of the dissertation reports an original research on the development of a portable biosensing device for Salmonella detection. The device was designed and constructed based on a previously developed optical biosensing method, using immuno-magnetic nanoparticles to specifically capture target bacteria, and immuno-quantum dot beads to label the target bacteria for fluorescence detection. All the actions of sample mixing, magnetic separation, and fluorescence detection were controlled automatically in a disposable microfluidic chip in the …

Essays On Spatial Econometrics Application In Study Of Conflict And Economic Activity, Ahmed Sadek Yousuf

Graduate Theses and Dissertations

Spatial interaction and the locational structure between observations as well as availability of satellite derived data has meant a richer and more exhaustive exploration of topics relevant in development topics, particularly in areas of subnational economic activity and conflict. This research leverages thus spatial econometric techniques to dynamically decompose impacts from socio-economic determinants on conflict incidence (with setting in Sub-Saharan Africa). Later I also present a statistical framework (based on extension of Henderson’s approach (2012)) to augment official income figures at district / county level with multiple satellite derived signals, with specific context given to developing countries.

In the first …