Digital Commons Network^™

Airport Security Investment Model, Joshua Daniel Bolton

Graduate Theses and Dissertations

In an increasingly mobile and diverse world, it is difficult to quantify the risk, or danger, associated with traveling. Airports have suffered greatly for being unable to define potential risks and protect against them. Intelligent adversary risk is a complicated high-level issue for many airports. Airports are targeted because of the large amount of people in a confined space and the social, economic, and psychological impact of terrorist attacks on the American people. In the months following September 11th, 2001, the airline industry in the United States lost $1.1 billion in revenue. The American people stayed grounded, for fear of …

Experimental Approaches To Understand And Control Salmonella Infection In Poultry, Yichao Yang

Graduate Theses and Dissertations

Salmonella is a major foodborne pathogen around the world and chickens are the major reservoir to transmit Salmonella into the human food chain. For decreasing the infection of Salmonella, we developed six attenuated live vaccines based on Salmonella Enteritidis (SE) and Typhimurium (ST) for testing the cross-serovar and cross-serogroup protection from the challenge of Salmonella Heidelberg and Campylobacter jejuni. One of the constructed vaccine strain showed ability to protect against challenge from Salmonella Heidelberg. Even though some preventive approaches are able to decrease Salmonella colonization in the gastrointestinal tract of chickens or other farm animals, Salmonella transmission mechanisms remain unclear. …

Peptoid-Modified Bicelles As Surrogate Cell Membranes For Membrane Protein Sensors And Analytics, Helya Najafi

Graduate Theses and Dissertations

Membrane-affiliated interactions are significant in understanding cell function, detecting biomarkers to diagnose disease, and in testing the efficiency of new therapeutic targets. Model membrane systems have been developed to study membrane proteins, allowing for stable protein structure and maintaining native activity. Bicelles, disc-shaped lipid bilayers created by combining long- and short-chain phospholipids, are the model membrane system of focus in this study. Bicelles are accessible from both sides and have a wide size range, which make them attractive for studying membrane proteins without affecting function. In this work, bicelles were functionalized with two peptoids to alter the edge and face …

Role Of Incompatibility Group 1 (Inci1) Plasmid-Encoded Factors On Salmonella Enterica Antimicrobial Resistance And Virulence, Pravin Raghunath Kaldhone

Graduate Theses and Dissertations

Foodborne illnesses are a leading cause of infectious diseases in the world. Among enteric organisms Salmonella is a key pathogen. It’s high prevalence in poultry and other food-animal sources make it imperative to study. Salmonella has the ability to modify its genetic content with help of mobile genetic elements such as plasmids. Incompatibiltiy group 1 (IncI1) plasmids are commonly reported in Salmonella. This study evaluates role on IncI1 plasmids in antimicrobial resistance and virulence in Salmonella. Genetic determinants of resistance and virulence are noted among our IncI1-containing Salmonella isolates. These genetic elements are also transferable and reported to carry respective …

An Analysis Of Scholarship Distribution By Division I Softball Coaches, Donovan James Nelson

Graduate Theses and Dissertations

The purpose of this study was to explore fairness factors used by NCAA Division I head softball coaches in scholarship distribution. Research by Hums & Chelladurai introduced Distributive Justice principles to intercollegiate athletics; indicating need was a popular distribution principle. Continued research by Mahony, Hums, & Riemer determined need as a common distribution principle in athletics. Prior to this study, no research has been done to examine distribution principles by NCAA Division I softball coaches based on distributive justice principles. This study used a single scenario of grant-in-aid distribution with six possible decisions coaches make to determine fairness of grant-in-aid …

Developing Methods Of Obtaining Quality Failure Information From Complex Systems, Oladapo Olalekan Bello

Graduate Theses and Dissertations

The complexity in most engineering systems is constantly growing due to ever-increasing technological advancements. This result in a corresponding need for methods that adequately account for the reliability of such systems based on failure information from components that make up these systems.

This dissertation presents an approach to validating qualitative function failure results from model abstraction details. The impact of the level of detail available to a system designer during conceptual stages of design is considered for failure space exploration in a complex system. Specifically, the study develops an efficient approach towards detailed function and behavior modeling required for complex …

Development Of Deep Site Specific And Reference Shear Wave Velocity Profiles In The Canterbury Plains, New Zealand, Michael Ryan Deschenes

Graduate Theses and Dissertations

Deep (typically >1000 m) shear wave velocity profiles were developed across the Canterbury basin at nine strong motion stations using a combination of active and passive surface wave methods and horizontal to vertical spectral ratio measurements. A multi-mode, multi-method joint inversion process, which included Rayleigh and Love wave dispersion and horizontal to vertical spectral ratio data, was used to estimate the shear wave velocity profiles at each site. A-priori geologic information was utilized in defining preliminary constraints on the complex geologic layering of the Canterbury basin. At sites where interbedded layers were present, velocity reversals were considered in the inversion. …

Testing An Integrated Model Of Help Seeking With Ethnically Diverse Primary Care Patients, Bianca Teresa Villalobos

Graduate Theses and Dissertations

Structural and attitudinal barriers prevent many individuals from accessing professional mental health services and often times lead to the premature termination of treatment. Although research findings suggest that the integration of mental health services in primary care can increase access to services and reduce stigma for typically underserved populations, dropout occurs at high rates. The current study aims to: (1) identify correlates of attitudinal and structural barriers in a primary care setting, and (2) test the ability of the Integrated Model of Seeking Help (IMoSH) to predict follow-up for behavioral health visits. In particular, it was hypothesized that attitudinal barriers …

Membranes For Food And Bioproduct Processing, Alexandru Marius Avram

Graduate Theses and Dissertations

Modified membranes for process intensification in biomass hydrolysis

Production of biofuels and chemicals from lignocellulosic biomass is one of the leading candidates for replacement of petroleum based fuels and chemicals. However, conversion of lignocellulosic biomass into fuels and chemicals is not cost effective compared to the production of fuels and chemicals from crude oil reserves. Some novel and economically feasible approaches involve the use of ionic liquids as solvents or co-solvents, since these show improved solvation capability of cellulose over simple aqueous systems. Membranes offer unique opportunities for process intensification which involves fractionation of the resulting biomass hydrolysate leading to …

Removal Of Endocrine Disrupting Compounds Using Membrane Bioreactor, Mohanad Ali Abdulsahib Kamaz

Graduate Theses and Dissertations

The presence of endocrine disrupting compounds (EDCs) and pharmaceutically active compounds (PhAC) such as pesticides, personal care products, antibiotics and pharmaceutical compounds, in sewage, industrial, and domestic waters has extensively become the major concern for health and environmental organizations. These compounds have the ability to interact with mammalian endocrine system and disrupting their functions. The traditional activated sludge processes are designed to degrade solids, organic carbon and nitrogen loading. Although several treatment steps in a wastewater treatment plant can contribute to partial removal of EDCs, effective removal has been a challenge due to their resistant chemical and biological degradation and …

The Role Of Attention And Memory In Prospective Person Memory, Kara Nicole Moore

Graduate Theses and Dissertations

I examined the role of memory and attention in prospective person memory. Prospective person memory involves being on the lookout for a person with the goal of completing some task (i.e., contacting the authorities) upon encountering the person. Success at prospective person memory tasks in lab and field based studies is rather low (i.e., less than 10% of people report encountering the person). In the current study the prospective person memory task involved a simulated search for a missing person. I manipulated attention to the missing person and strategic monitoring, which involves being in retrieval mode and searching for cues. …

A Social Marketing Plan For The Children's Safety Center, Morganne Kaylyn Rhodes

Graduate Theses and Dissertations

The Children’s Safety Center (CSC) is a nonprofit organization in Springdale, Arkansas, that advocates for child abuse victims in Northwest Arkansas. This thesis project includes a social marketing plan that aims to increase the overall awareness of the CSC and its new prevention programs used to decrease the number of child abuse victims in Northwest Arkansas. The social marketing plan also aims to create behavioral changes that increase participation in prevention programs and social media engagement, in addition to volunteers and donors. The plan was developed based on research on effective nonprofit social marketing plans, research on efficient communication efforts …

Peptide-Directed Nanoparticle Synthesis With A Denovo Pd-Binding Sequence Fused To A Reporter Protein, Rita Eloisa Tejada Vaprio

Graduate Theses and Dissertations

There is a need for low-cost nanoparticle materials in the context of new technologies for catalyst development. The purpose of this work was to recombinantly produce a 45- amino acid long metal binding peptide that is useful for nanoparticle synthesis. Using splicing by overlap extension PCR, a synthetic gene containing the fusion of the metal binding peptide with Green Fluorescent Protein (GFPUV) was constructed. The metal binding peptide, fused to reporter protein GFPUV, was expressed using high cell density fermentation. Palladium nanoparticles of an average diameter of 1.18 0.45 nm were synthesized by using the crude cell extract containing the …

Attitudes Of Students With And Without Disabilities Toward Physical Education And Their Sports And Activities Preferences In Saudi Arabia, Zuhair Abdaladeem Al Salim

Graduate Theses and Dissertations

Saudi Arabia is one of the biggest countries in the Middle East, and it has paid particular attention to public education to prepare students to become good citizens. Physical education (PE) can have a vital influence on all children and adolescents’ lifestyles, including those with disabilities. The purpose of this study was to examine attitudes of Saudi Arabian students with and without disabilities toward PE as well as their sport and activities preferences. A second purpose was to investigate the effect of school levels and student participation in physical activity after school on students’ attitudes in PE. A final purpose …

And They Entered As Ladies: When Race, Class And Black Femininity Clashed At Central High School, Misti Nicole Harper

Graduate Theses and Dissertations

“And They Entered as Ladies: When Race, Class and Black Femininity Clashed at Central High School,” explores the intersectionality of race, gender and class status as middle-class black women led the integration movement and were the focal point of white backlash during the 1957 Little Rock Central High School crisis. Six of the nine black students chosen to integrate Central High School were carefully selected girls from middle-class homes, whose mothers and female family members played active parts in keeping their daughters enrolled at Central, while Daisy Gatson Bates orchestrated the integration of the capital’s school system. Nevertheless, these women …

The Impact Of Social Situations On College Students’ Perceptions Of Sexual Consent, Casey Jane Ward

Graduate Theses and Dissertations

The majority of research examining sexual consent among college students focuses on how young adults communicate sexual consent during interactions immediately preceding a sexual encounter. However, preliminary research suggests that college students perceive that individuals begin to communicate sexual consent within social settings (e.g., at a bar) and through nonsexual interactions (e.g., text messaging); this has been labeled “outside the bedroom” consent. In order to further explore “outside the bedroom” consent, college students (n= 789) were randomly assigned to read four of sixteen vignettes. Within each vignette, four variables were manipulated: gender of the initiator (male or female), the social …

Effects Of Upward Football Reclassification On Revenues, Football Attendance, And Enrollment, Charles Bell

Graduate Theses and Dissertations

With an ever increasing chasm between the have and have nots in college athletics, athletic directors and university administrators view reclassification as a way to increase financial standing and gain valuable exposure for their school despite mixed findings by recent studies. The process of reclassification costs schools sizable financial and labor investments detracting from their academic endeavors. The schools at the highest level of collegiate football competition enjoy constant national television exposure for their school resulting in many direct and indirect benefits. A repeated measures ANOVA was utilized to assess the change in athletic department revenues, student enrollment and football …

Mechanisms And Implications Of Identity Hybridization In Online Advertorials, Christopher Lee Borntrager

Graduate Theses and Dissertations

This study analyzes the ways corporate-sponsored image advertorials published in online platforms construct identities for their sponsor. By analyzing 6 advertorials from The Guardian Online as well as a user comment thread on the same website using critical linguistic analysis and conversation analysis, respectively, this study suggests that the identities constructed in corporate-sponsored advertorials are a hybridized form, claiming both the goals of a corporation and the social legitimacy of a professional activist. To construct these hybrid identities, the advertorials in this sampling used specific linguistic strategies to demonstrate agency with regard to a specific social issue while seeming to …

Experiment-Based Quantitative Modeling For The Antibacterial Activity Of Silver Nanoparticles, Mohammad Aminul Haque

Graduate Theses and Dissertations

Silver (Ag) has been well known for its antimicrobial activity for a long time. Recent research showed the potential of Ag nanoparticles as emerging antimicrobial agents. However, little quantitative analysis has been performed so far to decipher the mechanism of interaction between nanoparticles and bacteria. Here, a detailed analysis based on kinetic growth assay and colony forming unit assay has been carried out to study the antimicrobial effect of Ag nanoparticles against Escherichia coli (E. coli) bacteria. It was observed that the presence of Ag nanoparticles increased the lag time of bacterial growth while not affecting the maximum growth rate …

Investigating The Impact Of Corporate Social Responsibility On Conative Loyalty In Collegiate Sports, Sunyoong Kim

Graduate Theses and Dissertations

Corporate social responsibility (CSR) has been an important topic in business and other disciplines due to its various benefits for both society (e.g., contributing to public health, safety, education, human rights, community well-being, environment) and organizations (e.g., attracting new customers, enhancing sales of products, developing positive brand image or reputation) (Inoue, 2011; Kim, 2015; Kotler & Lee, 2005; Smith & Westerbeek, 2007). Many consumers expect corporate organizations to demonstrate their commitments and contributions to the community (Marin, Ruiz, & Rubio, 2009; Walker & Heere, 2011). Thus, it is important to satisfy their expectations through social activities since consumers are considered …

Growth And Survivability Of Microorganisms At Martian Temperatures And Pressures, Rebecca Lynne Mickol

Graduate Theses and Dissertations

The discovery of methane in the martian atmosphere via numerous ground- and space-based sources has prompted the study of methanogens as models for life on Mars. Methanogens are microorganisms within the domain Archaea, many of which utilize carbon dioxide (CO2) and hydrogen to produce methane. The non-photosynthetic nature of methanogens indicates that they could exist in sub-surface environments, protected from harmful UV and ionizing radiation on the surface of Mars. These organisms also do not require organics, which are sparse on the planet.

Additionally, the wide variety of environments we find life in on Earth, as well as evidence for …

Curricular Analysis Of The University Of Arkansas Composition I Pilot Course: Engl 1013, Community Ethnography, Morgan Lindsay Scholz

Graduate Theses and Dissertations

This thesis analyzes a new first-year writing course that is under consideration for implementation as the standard Composition I course at the University of Arkansas. The course utilizes an ethnographic approach to teaching critical writing skills to students. This thesis presents evaluation through a metacognitive lens and explores the course through a case study approach. This thesis also examines the expectations and concluding reflections of three stakeholder groups: students, instructors, and administrators.

An Investigation Of Sport Sponsorship Antecedents And Outcomes Through Levels Of Sponsor Prominence, Benjamin Colin Cork

Graduate Theses and Dissertations

Currently, global sport sponsorship is a multi-billion dollar industry that continues to show strong year-to-year growth (IEG, 2016). Additionally, the current body of sport sponsorship literature has reported the effects of salient attitudinal and behavioral constructs on sponsorship effectiveness. For example, previous studies have indicated that the perceived sincerity and attitude toward a sponsor do positively effect a consumer's behavioral intentions toward a sponsor (Speed & Thompson, 2000; Biscaia, Correia, Rosado, Ross, & Maroco, 2013). Therefore, the purpose of this study is to measure consumer attitudes and behavioral intent toward sponsor, through experimental design, when exposed to one of three …

A Mixed-Methods Study Of Sexual Assault In Lesbian, Gay, And Bisexual Adults In The U.S., Sasha Nichole Canan

Graduate Theses and Dissertations

Background. Previous research finds that (1) lesbian and bisexual (LB) women as well as gay and bisexual (GB) men have higher rates of rape victimization compared to their heterosexual (H) peers and (2) perceived familial support reduces the impact of some of rape’s negative health outcomes in heterosexual victims. However, specific contextual factors regarding rape and assessment of familial support for LGB victims are severely lacking. Also, measurements of sexual assault victimization have yet to be validated in this population.

Methodology. The current study used a mixed-methods design that included two phases of data collection. Phase 1 was a national …

Optimization Of Miniaturized Resonant Microwave Cavities For Use In Q-Thrusters, Joshua Steven Pennington

Graduate Theses and Dissertations

A gedankenexperiment was considered to compare a hypothetical thruster that used no reaction mass to propulsion methods currently in use. A brief discussion of previous research work done on closed resonant cavity thrust devices was conducted. Using the previous work as a template, a simulation plan was devised. Computational models of resonant microwave cavities were constructed and investigated using COMSOL software. These COMSOL simulations were verified against known analytical solutions using Matlab software as a computational tool. Multiphysics simulations were created to study the microwave heating environment of the resonant cavities. From the COMSOL study outputs, the electromagnetic field magnitude, …

Job Satisfaction In The Digital Age: A Qualitative Study Of Social Responsibility And Burnout In Local Television News Reporters, Christi Welter

Graduate Theses and Dissertations

This is an exploratory study of job satisfaction, burnout, and social responsibility among local television news reporters with three years of experience or less. Through in-depth qualitative interviews, this study applied existing theory while exploring the factors that influence job satisfaction and burnout in local television news reporters. This study explored whether local television journalists feel they are able to meet the normative professional standards outlined in the social responsibility theory as their work demands increase with rise of digital media and one-man band expectations. The job satisfaction levels of the participants in this study varied. Those with higher job …

Phylogenetic Diversity Of The Bacterial Communities In Craft Beer, Lindsey Rodhouse

Graduate Theses and Dissertations

The craft beer industry is increasing in popularity in the United States. The craft brewing process typically does not use a pasteurization step, therefore the boiling process is the primary critical control step. Any microorganisms introduced after boiling, or those that are not killed during boiling, are likely to participate in fermentation and persist in the final product. Previous culture-based studies have isolated bacteria and yeast from craft beers at specific time points, but little research has been done on the process as a whole. The objectives of this research are to (1) track bacteria development throughout the brewing process …

Membrane Surface Engineering For Biochemical Applications, Anh T. Vu

Graduate Theses and Dissertations

Synthetic membranes have been frequently used for many fields, such as, the food and beverage, biopharmaceutical, and biofuel industries. In the beer industry, microfiltration frequently suffers from fouling due to the interaction between different species. It is shown that polyphenols can form cross-links with protein molecules, forming insoluble aggregates. However, by adding an optimal amount of polysaccharides these aggregates can be disrupted thus reducing fouling by the aggregates. Confocal laser scanning microscopy (CLSM) is a powerful technique to locate the foulants inside the wet membrane in order to understand more about the behavior of fouling in microfiltration.

Membrane surface modification …

Improvement In Simple Artificial Insemination In Sheep Using Chilled Extended Semen And Consideration Of Fertility In Ewes, Mohan Acharya

Graduate Theses and Dissertations

Three studies were conducted to improve simple artificial insemination in sheep using chilled extended semen and evaluate methods to predict fertility in ewes. The first study evaluated the effect of semen extenders and storage temperature on motility parameters of ram semen stored for up to 72 h. Single semen collected from each ram was divided into four parts and extended using four extenders: milk, TRIS, TEST, and CJ-2, diluted to 600 million sperm/ml and loaded into 0.25 ml straws for storage at 4 and 15° C. Most of the CASA motility parameters were higher after extension and storage at 4 …

Studies In Blackberry: Development And Implementation Of A Phenotyping Protocol For Blackberry Seedling Populations And Impact Of Time Of Day Of Harvest On Red Drupelet Reversion For University Of Arkansas Blackberry Genotypes, Melinda Yin

Graduate Theses and Dissertations

There are two major public blackberry (Rubus L. subgenus rubus Watson) breeding programs in the United States: one at the University of Arkansas (UA) and another at the U.S. Department of Agriculture Agricultural Research Service Horticultural Crops Research Unit (USDA-ARS HCRU) based in Corvallis, OR. The germplasm and breeding objectives of these two breeding programs are diverse, but frequent collaboration necessitated a standardized method of characterizing plant and fruit traits. A phenotyping protocol for blackberry was developed at UA and implemented for two years on UA seedling populations. The protocol included plant traits (health, vigor, estimated crop load, peak bloom …