Digital Commons Network^™

Automatic User Profile Construction For A Personalized News Recommender System Using Twitter, Shiva Theja Reddy Gopidi

Graduate Theses and Dissertations

Modern society has now grown accustomed to reading online or digital news. However, the huge corpus of information available online poses a challenge to users when trying to find relevant articles. A hybrid system “Personalized News Recommender Using Twitter’ has been developed to recommend articles to a user based on the popularity of the articles and also the profile of the user. The hybrid system is a fusion of a collaborative recommender system developed using tweets from the “Twitter” public timeline and a content recommender system based the user’s past interests summarized in their conceptual user profile. In previous work, …

The Impact Of Knowledge And Gender On Young Adults' Perceptions Regarding Beer And Food Pairings, Dylan Conrad Martinez

Graduate Theses and Dissertations

Food and wine pairings are commonly seen among empirical research. Minimal research exists concerning beer and food pairings, yet food analysts are taking note of higher rates of beer and food pairings occurring. As such, these exploratory studies examine young adults’, experts’ and novices’ knowledge of beer and food pairings along with gender differences and sensory pairing of beer and chocolate. A survey was used to identify both subjective and objective knowledge along with a test to determine appropriateness of expert and novice choices. It was found that males had greater objective knowledge of beer and food pairing than females, …

Effects Of Food Label Education On Consumers' Sensory Perception And Awareness In Chicken Meat, Shilpa Samant

Graduate Theses and Dissertations

Recently, sustainability and process-related label claims have gained immense popularity especially for meat products like chicken. Apart from providing consumers with required product information, these labels have an impact on consumer perception and purchase behavior. The objective of this study was to determine whether providing label information affects consumers’ awareness and attitude toward the claims found on chicken products. Additionally, it was analyzed if enhanced label understanding affects consumers’ sensory and quality perceptions along with purchase intent. A total of 110 participants were randomly distributed into 1 of 3 types of education sessions: (1) reading a flyer (passive learning), (2) …

Fret Study Of Ligand Binding And Exchange Kinetics On The Surface Of Cdse/Zns Quantum Dots, Randee Jean Mcbride

Graduate Theses and Dissertations

Quantum dots are a valuable tool in many research applications and commercial development. Their applications are far reaching and as such have become a topic of great interest. One of their greatest assets is the ability to utilize them as water soluble fluorescent labels. Rendering the nanocrystals water soluble can be accomplished in several ways, but one very popular method is by capping them with water-soluble multi-functional organic ligands. However, these ligands, when attached to the quantum dot surface, are labile and can be exchanged which can be problematic when using the quantum dots in research applications. This projects investigates …

Spatiotemporal Fluctuations Of Olfactory Stimuli And Its Detection By An Optical Method, Mitu Chandra Acharjee

Graduate Theses and Dissertations

Olfactory processing in the mammalian brain is a highly dynamic process, yet most of the olfaction experiments have been studied primarily with static stimuli. Odors in the natural environment are transported by turbulent flow of air or water. Natural odorants have fluctuations in concentration and it changes rapidly with time. These rapid fluctuations may pose some challenges to identifying an odor; on the other hand, the variation itself may provide important clues about the odor source. The goal of this thesis project was to create a similar odorant environment like the rapid odor fluctuations encountered in nature – to meet …

Immigrant Cosmopolitanism: Jewish-American Immigrant Narratives And Modernist Cosmopolitan Aesthetics, Mindy Renee Trenary

Graduate Theses and Dissertations

I propose to show in this study how Jewish-American authors of mass media immigrant works from the first three decades of the 20th century utilize a form of modernist cosmopolitan aesthetics to challenge notions that these works are unworthy of study and appreciation. These authors, not happy with the classifications and aesthetics available to them as immigrant authors, borrow from other ideologies and aesthetic schools to create an aesthetic system meeting the needs of immigrant individuals. In theory, this system, which I have termed 'immigrant cosmopolitanism,' meets the needs of these individuals and capitalizes on the authors' diverse backgrounds and …

Principals' Perceptions Of Technology Implementation In High Schools And Their Effects On Leadership, Mary Valerie Perkins-Jacobs

Graduate Theses and Dissertations

School administrators who are able to implement technology in their schools must see themselves as technology leaders; they are enthusiastic when it comes to using technology in professional development. This research study investigated how high school principals’ attitudes and perceptions of effectively organizing, utilizing, and implementing technology in order to support the mission and vision of the school by using the National Educational Technology Standards for Administrators (NETS-A) and Performance Indicators for Administrators (ISTE/NETS-A). For school administrators to provide effective leadership in their schools in the 21st century, they must possess knowledge and understanding of the issues and the capabilities …

A Light In Darkness, Oscar Micheaux: Entrepreneur Intellectual Agitator, Airic Hughes

Graduate Theses and Dissertations

Oscar Micheaux was a luminary who served as an agent of racial uplift, with a unique message to share with the world on behalf of the culturally marginalized African Americans. He produced projects that conveyed the complexity of the true black experience with passion and creative courage. His films empowered black audiences and challenged conventional stereotypes of black culture and potential. The legacy of Oscar Micheaux is historically unparalleled among his contemporaries. He transcended traditionally held perspectives about what black people could accomplish. The consciousness within his work still heavily influences black entertainment today. This study seeks to add to …

Novel Azole-Based Rearrangements, Kolawole Folayele Ayinuola

Graduate Theses and Dissertations

This work describes efforts targeted at the development of novel reactivity modes for the Breslow intermediate, which was proposed by Breslow to explain the mechanism of action of thiamine-dependent enzymes. By employing this intermediate as a hydroxy-substituted N,S-ketene acetal, we successfully captured it via Claisen rearrangement towards the preparation of diaryl tertiary alcohol products that are isomers of the hitherto elusive intermediate. This strategy also constitutes an unusual disconnection for a Claisen rearrangement precursor.

We have also uncovered an unprecedented radical C-N bond scission of a Breslow intermediate when a fluorenyl group is installed on the azolium nitrogen atom. This …

Understanding The Experiences Of African-American Relatives Who Serve As Care Providers To Custodial Children In Arkansas: An Intersectional Case Study, Carmen Johnson-Hardin

Graduate Theses and Dissertations

An increase in the provision of long-term care by relative caregivers to custodial children has brought attention to the physical, emotional, and Social challenges of this complex caregiving experience. Prior studies have examined separate structural identities that focus on comparing the quality of life, educational status, Social status, and income of grandparent custodial caregivers. To extend this research, it is important to explore the gaps in service provisions to relative caregivers; comparative viewpoints of relative caregivers and service providers regarding policies and practices; and heterogeneity among Black relative caregivers utilizing an intersectional framework. Face-to-face or telephone interviews were conducted with …

Comparison Of Different Modulators That Affect Macrophage Activation In Vitro, Alda Alexa Díaz Pérez

Graduate Theses and Dissertations

Inflammation is known as a mechanism to regulate and control infections as well as promote tissue repair. Macrophages (Mф) are known to be a major cell type in the initiation, sustainability and resolution of inflammation. Moreover, Mф are essential for the remodeling process that is also known as the wound healing response. The objective of this research was to compare five modulators (acetylsalicylic acid (ASA), dexamethasone (DEX), prostaglandin E2 (PGE2), iloprost, and resolvin D1 (RvD1) for their anti-inflammatory effects on macrophages in vitro. Then, Mф phenotype in terms of gene expression and secreted cytokine response was determined. Our study compared …

Production And Characterization Of Islet Amyloid Polypeptide Using Recombinant Technology, Emilio Duverna

Graduate Theses and Dissertations

Islet amyloid polypeptide (IAPP) also called amylin is an amyloid-forming protein; IAPP is a proteinaceous hormone that comprises 37 amino acid residues. It is secreted along with insulin from the pancreatic β-cells to help it regulate the uptake and removal of glucose in the bloodstream. IAPP has been observed in the amyloid deposits found in pancreatic β-cells of most patients suffering from type II diabetes mellitus. This research project aims at producing recombinant amylin peptide. To achieve this goal, we used the pBAD plasmid vector which we introduced into Escherichia coli to express the peptide. Although the vector was successfully …

Dramatizing Power And Resistance: Images Of Women In Pakistani And Indian Alternative Theater, Sobia Mubarak

Graduate Theses and Dissertations

This dissertation analyzes Pakistani and Indian plays that illustrate the nexus of power relations that operate in Pakistan and India to disempower women and the way women resist by creating dialogic spaces or fissures in the exploitative system. I have selected plays by Ajoka Theater in Pakistan and plays dealing with the similar thematic concerns by notable Indian playwrights to explore common grounds and points of departure. I have chosen four images of women depicting diverse modes of oppression associated with women’s bodies that are dealt with in these plays.

Chapter 1 examines Barri/The Acquittal by Ajoka theater, and Mother …

Effect Of Nitrogen Fertilizer Rates And Two-Spotted Spider Mite Incidence On 'Strawberry Festival' Strawberry Cultivar Performance, Megan E. Mcgovern

Graduate Theses and Dissertations

The decline in strawberry (Fragaria x ananassa Duch.) production in Arkansas over the last 50 years has sparked an interest in the use of season extension techniques to improve yield and fruit quality. High tunnel strawberry production has the potential to become a profitable and sustainable production system; however, information on nutrient and pest management is limited.

The overall objective of this study was to determine the response of ‘St. Festival’ strawberry cultivar to different nitrogen fertilizer rates in order to develop a fertilization program for strawberries grown under high tunnel production systems. Experiments were conducted at the University of …

An Adaptive Large Neighborhood Search Heuristic For The Inventory Routing Problem With Time Windows, Mina Hadianniasar

Graduate Theses and Dissertations

This research addresses an integrated distribution and inventory control problem which is faced by a large retail chain in the United States. In their current distribution network, a direct shipping policy is used to keep stores stocked with products. The shipping policy specifies that a dedicated trailer should be sent from the warehouse to a store when the trailer is full or after five business days, whichever comes first. Stores can only receive deliveries during a window of time (6 am to 6 pm). The retail chain is seeking more efficient alternatives to this policy, as measured by total transportation, …

Design, Fabrication, And Measurement Of A Multiple-Input Multiple-Output (Mimo) Antenna For Mobile Communication, Christopher Charles Arnold

Graduate Theses and Dissertations

This thesis presents the design, fabrication and characterization of a multiband uniplanar MIMO antenna for hand-held mobile communication devices on LTE, WLAN, and WMAN networks. The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled to a meander line element and parasitic structures. The 115×55×1.54 mm antenna was fabricated using an FR4 composite material and occupies only a fractional volume within the size of an average cellular phone allowing ample space to integrate with existing hardware. Characterization of the MIMO antenna included input impedance, scattering parameters and radiation pattern cross sections …

Shiga Toxin-Producing Escherichia Coli (Stec) Detection Strategies With Formalin-Fixed Stec Cells, Christopher Adam Baker

Graduate Theses and Dissertations

Certain pathogenic Escherichia coli known as Shiga toxin (Stx)-producing Escherichia coli (STEC) are commensals in cattle, and typically cause bloody diarrhea in humans once the Stx toxin is secreted in invaded intestinal epithelial cells. Infections with STEC cells can lead to hemolytic uremic syndrome, which is commonly associated with kidney failure. Several STEC serogroups have been declared adulterants in raw, non-intact ground meat, and future regulations could potentially lead to a higher number of STEC serogroup detection strategies for these pathogenic microorganisms. Microbiological research laboratories may benefit from formalin-fixed STEC cells for periodic (daily, weekly, monthly, among others) instrument validation/calibration …

Economic Literacy: Measuring The Economic Human Capital Of Arkansas K-12 Teachers, June Marie Freund

Graduate Theses and Dissertations

Economic literacy is recognized as a deficit quality in the United States, no more prevalent than during the last great recession. It is paramount the K-12 educational system lead the movement to educate the public on economic content and issues, as it is the one institution that has direct contact with all citizens. The question then must be asked, how economic literate are teachers entrusted with the responsibility of imparting economic knowledge to his/her K-12 grade level student. A sample of Arkansas teachers at each grade level K – 12 were tested using national normed economic literacy tests designed to …

Reducing Nutrient Runoff From Poultry Production Facilities Using Locally-Sourced Iron And Aluminum Byproducts, Sheri Lynn Herron

Graduate Theses and Dissertations

Phosphorus (P) inputs to fresh waters can accelerate the eutrophication process. Agricultural nutrient runoff has been shown to be a contributor of P and nitrogen (N). Broiler production areas were evaluated for their potential to contribute P and N to runoff. Broiler house dust (BHD) samples were analyzed and compared to broiler litter (BL), rainfall simulations were conducted on plots adjacent to broiler house fans to evaluate nutrient enrichment in runoff from deposited dust, and runoff was automatically sampled at two culverts draining the land around broiler houses. Following this, an on-farm byproduct containment and nutrient removal structure was designed …

Temperature In The Cotton (Gossypium Hirsutum L.) Canopy And Effects On Cotton Leaf And Boll Growth, Maria Soledad Berlangieri Costa

Graduate Theses and Dissertations

Cotton development and yield are negatively influenced by extremes temperatures, mainly during reproductive stage. Ambient air temperature is used to evaluate temperature stress effect on yield under field conditions; however, there is evidence that actual temperatures in the canopy where bolls develop are different. In terms of cotton responses, there is limited research about the effects of elevated day and night temperatures upon boll carbohydrate content, size, and boll respiration. Field and growth chamber experiments were performed during 2014-2015 using the cotton (Gossypium hirsutum L.) cultivar DP0912B2RF. Field studies for determining temperature gradients through the canopy consisted of two planting …

The Ability Of Select Probiotics To Reduce Enteric Campylobacter Colonization In Broiler Chickens, Sandip Shrestha

Graduate Theses and Dissertations

Campylobacter is the leading cause of foodborne illness worldwide and is often associated with consumption and/or mishandling of contaminated poultry products. Probiotic use in poultry has been an effective strategy in reducing other enteric foodborne pathogens but not consistently for Campylobacter. As Campylobacter resides and utilizes intestinal mucin for growth, isolates selected on the basis of mucin utilization might be a strategy to screen for efficacious probiotic bacterium. In this study, bacterial isolates demonstrating increased growth rates in mucin, in vitro (trials 1 or 2), or isolates demonstrating a reduction of Campylobacter counts when co-incubated with mucin, in vitro (trials …

Volkswagen And Volkswagen: The Concept, The Car And The Company In Four Germanies And The United States, Stuart Treavor Bailey

Graduate Theses and Dissertations

This thesis explores the changing cultural meanings that the Volkswagen took in Germany in an attempt to understand the cultural exchange between the United States and Germany. In sum, it establishes that the car takes a distinct cultural form in the two countries governed by unique and particular historical developments. Over the last decade researchers working with car cultures have realized the long standing error of taking American values associated with the car as a normative marker of global car cultures, yet no one has suggested a working methodology to ensure that non-normative meanings are captured in analysis. I suggest …

The Life You've Seen: The Search For Feminine Identity Ruined My Life, Cambry Lace Pierce

Graduate Theses and Dissertations

The Life You've Seen: The Search For Feminine Identity Ruined My Life is a video installation created through the exploration for the search for identity, specifically female, in my personal work and in the art world for over sixty years. The videos, depicting myself in costume, display twenty different personas and scenarios created to expose the futility of this ongoing search through exposing the traditional ways in which forces such as nature, biology, heredity, and cultural constructs have been used in attempts to define "self." The installation format of the work, a wall of decades old television sets, and the …

Biofilm-Related Materials As Total N-Nitrosamine (Tono) Precursors And Hydroxylamine-Based Interferences In Tono And N-Nitrosodimethylamine (Ndma) Measurements, David Allen Meints

Graduate Theses and Dissertations

In this study, a chemiluminescence-based total N-nitrosamine (TONO) assay was adapted to include a solid-phase extraction (SPE) step to assess the role of biologically derived materials as N-nitrosamine precursors. Methanol was determined to be a suitable solvent for the SPE-TONO assay, with N-nitrosodimethylamine (NDMA) losses estimated to be 30% by SPE alone and an additional 15% from concentration of the methanol extracts by N2-gas blowdown. Three biofilm-derived materials - poly-N-acetylglucosamine (PNAG), Pseudomonas aeruginosa, and tryptophan - were individually chloraminated and dose-response relationships were observed with the SPE-TONO assay, indicating biofilm are potential N-nitrosamine precursors. The role of hydroxylamine - a …

Noise., Laura Katherine Polaski

Graduate Theses and Dissertations

My research is in the realm of the psychological, the emotional and way these drives manifest physically. The works in Noise. aims to give a physical representation to the non-physical. Research on Affect Theory and the teachings of Silvan Tomkins were paramount to understanding emotional drives and the ways in which they manifest.

The purpose of this research is to understand how emotions are generated and communicated and to ask if specific emotions can be generated upon viewing inanimate objects. I create abstract figurative sculpture, which imitate emotion that has no specific physicality. These works exist with one foot in …

Poultry Production Messaging: A Content Analysis Of Three National Newspapers From 1994 To 2014, Stuart Estes

Graduate Theses and Dissertations

Consumers are increasingly concerned with the use of antibiotics and hormones in poultry production, and the news media is the primary way consumers gain knowledge about this subject. This study assessed articles about antibiotic and hormone use in poultry production from the New York Times, USA Today, and the Wall Street Journal from 1994 to 2014. This study employed a content analysis methodology to assess selected articles (n = 139) for key messaging about antibiotic and hormone use in poultry production, article tone, article framing, and article journalistic quality. Data gathered from key messages were assessed for emergent themes that …

Using The Triple Bottom Line To Select Sustainable Suppliers For A Major Oil And Gas Company, Pandarinath Adarsh Sunkari

Graduate Theses and Dissertations

Companies have primarily been focusing on the financial bottom line i.e., on increasing profits by increasing revenues and reducing costs. With high energy usage and environmental change posing threats to the environment and business operations, companies are now considering sustainability. Since some global suppliers have low cost labor, Social well-being and human development has also emerged as major goals of a company performing global operations. Focusing on these three goals is termed the "Triple Bottom Line" (TBL). We study and explore the TBL benefits that could be realized by an oil and gas company by focusing on sustainable suppliers. A …

Aerial Thermography In Archaeological Prospection: Applications & Processing, Autumn Chrysantha Cool

Graduate Theses and Dissertations

Aerial thermography is one of the least utilized archaeological prospection methods, yet it has great potential for detecting anthropogenic anomalies. Thermal infrared radiation is absorbed and reemitted at varying rates by all objects on and within the ground depending upon their density, composition, and moisture content. If an area containing archaeological features is recorded at the moment when their thermal signatures most strongly contrast with that of the surrounding matrix, they can be visually identified in thermal images.

Research conducted in the 1960s and 1970s established a few basic rules for conducting thermal survey, but the expense associated with the …

The Ballistics Of Archaic North American Atlatls And Darts, Devin Brent Pettigrew

Graduate Theses and Dissertations

Preserved atlatls and darts, commonly of small size, have been found across North America from the Early to Late Archaic. Close replications of these systems were employed in a naturalistic experiment on a fresh hog carcass. The use of high-speed cameras, a radar gun, and a video analysis program to measure dart velocity and view impacts in slow motion allowed a detailed analysis of the results. The experiment captured several details about atlatl and dart ballistics, including killing potential, the effects of point beveling on dart flight and impact, traceable impact damage on bones and stone points, and the effectiveness …

A Promise Kept In El Dorado? An Evaluation Of The Impact Of A Universal, Place-Based College Scholarship On K-12 Achievement And High School Graduation, Jennifer W. Ash

Graduate Theses and Dissertations

The El Dorado Promise is a scholarship program that provides approximately $7,818 per year toward college tuition - for up to five years - to public high school graduates in El Dorado, Arkansas who have attended El Dorado schools since at least the ninth grade. The program was announced in January 2007, and students were able to use the college scholarships in the fall of 2007. School leaders in El Dorado hoped that the enhanced access to college would increase student interest, engagement, and achievement throughout the school district. In this study, I use one-to-one student-level matching to estimate the …