Digital Commons Network^™

Substituting Failure Avoidance For Redundancy In Storage Fault Tolerance, Christopher David Brumgard

Doctoral Dissertations

The primary mechanism for overcoming faults in modern storage systems is to introduce redundancy in the form of replication and error correcting codes. The costs of such redundancy in hardware, system availability and overall complexity can be substantial, depending on the number and pattern of faults that are handled. This dissertation describes and analyzes, via simulation, a system that seeks to use disk failure avoidance to reduce the need for costly redundancy by using adaptive heuristics that anticipate such failures. While a number of predictive factors can be used, this research focuses on the three leading candidates of SMART errors, …

Understanding The Retail Investor: Technical And Fundamental Analysis, Ben Davis

Chancellor’s Honors Program Projects

No abstract provided.

Angiogenic Roles Of Vegfb And Vegfr1 In Vitro And In Vivo, Jacob Cecil

Chancellor’s Honors Program Projects

No abstract provided.

An Analysis Of Bystander Intervention Programs For Sorority Women, Elisabeth Callaghan Logan

Chancellor’s Honors Program Projects

No abstract provided.

Constrained Multi-Group Project Allocation Using Mahalanobis Distance, Abdulaziz Saud Alkabaa

Doctoral Dissertations

Optimal allocation is one of the most active research areas in operation research using binary integer variables. The allocation of multi constrained projects among several options available along a given planning horizon is an especially significant problem in the general area of item classification. The main goal of this dissertation is to develop an analytical approach for selecting projects that would be most attractive from an economic point of view to be developed or allocated among several options, such as in-house engineers and private contractors (in transportation projects). A relevant limiting resource in addition to the availability of funds is …

Academic Library Resources And Services For Online Distance Learners: An Exploratory Study, Roseanne Michele Sasso

Doctoral Dissertations

In this study distance learning library resources and services as provided by member institutions belonging to the Association of Research Libraries (ARL) were examined. The goals of this study were (a) to identify the types of distance learning library resources and services being provided, and (b) to gain insight into the experiences and perspectives of Association of Research Libraries’ library personnel in delivering library resources and services to their distance learning library patrons. This exploratory study consisted of two phases, where both quantitative and qualitative methods were used. Phase one involved a content analysis of member institution’s distance learning websites …

Assessing The Functional Similarity Of Native And Invasive Anolis Lizards In The Food Webs Of Structurally-Simple Habitats In Florida, Nathan W. Turnbough

Doctoral Dissertations

Invasive species often displace ecologically-similar native species, but the extent to which invading and displaced species function similarly in the food web processes of invaded communities is largely unknown. I investigated whether populations and individuals of an invasive Anolis lizard (the brown anole, Anolis sagrei) and the native congener it displaces in Florida (the green anole, Anolis carolinensis) are functionally equivalent in the food webs of open and structurally-simple habitats. In a system of invaded and uninvaded dredge-spoils islands, I found that both arthropod communities and winter bird communities covaried with brown anole abundance (and therefore the identity …

Patristic Precedent And Vernacular Innovation: The Practice And Theory Of Anglo-Saxon Translation, Andrew Timothy Eichel

Doctoral Dissertations

My dissertation investigates Anglo-Saxon translation and interpretation during the reign of King Alfred of Wessex in the ninth century, and the Benedictine Reform of the tenth and eleventh centuries. These two periods represent a time of renaissance in Anglo-Saxon England, when circumstance and ambition allowed for a number of impressive reformation enterprises, including increased dedication to education of both clerical orders and the laity, which therefore augmented the output of writing motivated by scholarly curiosity, ecclesiastical inquiry, and political strategizing. At these formative stages, translation emerged as perhaps the most critical task for the vernacular writers. The Latinate prestige culture …

Post-Concussion Experiences Of Collegiate Student-Athletes, Kaitlin Iris Singer

Doctoral Dissertations

Sports-related concussions are a major public health concern affecting a significant number of collegiate student-athletes. Medical and public health research has addressed every aspect of concussion management processes including concussion education, medical diagnosis, recovery, and returning to sport and classroom. This research has led to several best-practices for concussion management. Since 2010, the NCAA has mandated that its member institutions maintain concussion management policies and procedures. However, the current recommendations, based primarily on medical research, have been found in quantitative studies of the behaviors and practices of athletic trainers, coaches, and student-athletes to be ineffective. To date, no studies have …

Student And Instructor Experiences With Types Of Teaching And Learning In A Computer Course, Emily Carter Gray

Doctoral Dissertations

Research has shown that active classroom engagement increases the learning performance of students in higher education (Cross, 2000; Reese, 2013). This study sought to examine the experiences of students and instructor in a computer applications course in which the pedagogy was changed to encourage additional interaction among students and between students and the instructor. The goal of the study was to generate useful, practical knowledge (Reason & Bradbury, 2001) to help the instructor better understand her pedagogy with the intention of improving both her teaching practice and student learning outcomes, as well as to contribute to related literature in adult …

Language Learning Strategies Among Saudi Efl College Students And Their Relationship To Students’ Perceptual Learning Style, Gender, Academic Major And Proficiency Level, Saeed Saleh Alkahtani

Doctoral Dissertations

This study investigated the type and the frequency of language learning strategies and perceptual learning style preferences among Saudi EFL college students. It was conducted to examine the relationship between the students’ perceptual learning style preferences and their use of various types of language strategies. The study also examined the influence of genders, academic disciplines and language proficiency levels on the students’ preferences to employ different language learning strategies.

Participants in the study were 667 EFL college students studying at Yanbu English Language Institute (YELI). Participants included 440 male and 227 female students who enrolled in the preparatory English program. …

Characteristics Of Thick Concrete Neutron Reflection, Richard Gordon Taylor

Doctoral Dissertations

Water is considered as a neutron reflector in nuclear criticality safety evaluations because it is readily available and easily forms a close-fitting shape around fissile material. Concrete is commonly encountered industrial environments and can be a more effective reflector than water. Nuclear criticality safety literature reporting experimental and analytical studies involving concrete as a reflector from the 1950’s to the present was reviewed. Nuclear criticality safety community perspective on concrete reflection has evolved from acknowledgement that concrete is a reflector through recognition that concrete can be a more effective reflector than water to current interest in identifying which constituents are …

Social Exchange Between Destination Marketing Organizations And Stakeholders In Tennessee’S Rural Counties, Angela Gray Sebby

Doctoral Dissertations

Promoting local culture and heritage, natural resources, farm-to-table opportunities, and outdoor recreation, more visitors are now travelling to rural communities for these experiences.

The goal for rural areas interested in tourism is to create viable and sustainable tourism through destination-marketing strategies. These strategies require extensive research, appropriate planning, and allocated funding, often managed by a Destination Marketing Organization (DMO). With the creation of the Tennessee Rural Development Task Force, Tennessee’s strategy is to increase economic growth in rural communities.

While there is a need for the DMO to form an alliance with industry stakeholders, lack of incentives and strained relationships …

Multiscale Modeling Of Electrolytes For Energy Storage And Conversion, Fatemeh Sepehr

Doctoral Dissertations

Fuel cells, redox flow batteries, and secondary ion batteries are under active investigation to fulfill the requirements of efficient and sustainable energy storage and conversion technologies. The discovery of high-performance stable electrolytes that are relatively cheap and versatile is crucial to the commercialization of these electrochemical devices and necessitates a comprehensive understanding of the materials (i.e., from the atomistic to continuum levels). This dissertation is on multiscale modeling and simulations of several electrolytes under consideration in vanadium redox flow batteries (VRFBs), alkaline fuel cells (AFCs), or secondary magnesium batteries.

The hydrated structure and associated solvation Gibbs energies were determined for …

Viewing Power, Politics, And Loss: A Critical Discourse Analysis Of The Mass Media’S Representations Of Teacher Unions In The United States And The Consequences Concerning Policy, Melissa Ann Harness

Doctoral Dissertations

From 2011 to 2012, in Wisconsin, Governor Scott Walker and legislative republicans passed ACT- 10, a law severely limiting public sector/teachers union’s collective bargaining rights. This legislative effort shocked the nation with the bold move toward stricter regulations concerning the public sector, as Wisconsin is historically one of the most progressive states concerning labor within the United States. Teachers unions within the state took ACT-10 as an assault on their very profession. Shortly before the passing of the act, sit-ins and protests abounded within the capital of Madison that caught attention from both the local and national media.

To answer …

Synthesis, Reactivity, And Nmr Trends Of Early Transition Metal Compounds, Tabitha Marie Cook

Doctoral Dissertations

This dissertation focuses of three different subjects. The first is the synthesis and characterization of heptacoordinate amidinate compounds. Heptacoordinate compounds are not common, but their structures have been studied. Group 4 amidinate compounds have been used as precursors in the CVD/ ALD processes. Ancillary ligands, such as amidinates, have been used to reduce air-sensitivity of complexes. Reactions of these complexes with water have been used to make metal oxide thin films.

In the first study, the complexes Zr[MeC(NⁱPr)₂]₃Cl [zirconium trisamidinate chloride], Hf[MeC(NⁱPr)₂]₃Cl [hafnium trisamidinate chloride], Zr[MeC(NⁱPr) …

Microstructure Control And Correlation To Creep Properties In Grade 91 Steel Weldment After Thermo-Mechanical Treatments And An Fe-30cr-3al Alloy Strengthened By Fe2nb Laves Phase, Benjamin Allen Shassere

Doctoral Dissertations

Type IV cracking in weldments of steel pipes after creep deformation is a concern in modern fossil-fueled power plants. Two possible methods for minimizing or eliminating Type IV cracking will be discussed. The first method alters the initial microstructure of typical Grade 91 steel base metal before welding, while the second provides baseline microstructure characteristics and creep performance of a new alloy that is strengthened by the intermetallic Fe2Nb Laves phase. The initial microstructure of the Grade 91 steel can be controlled by Thermo-Mechanical Treatments, which aids in precipitation of fine (5-10 nm) MX particles in austenite before transformation to …

Factors Influencing Greenhouse Gas Emissions From Land Use, Land-Use Change, And Forest Activities, Pattarawan Watcharaanantapong

Doctoral Dissertations

Greenhouse gas (GHG) emissions are a major global issue because of their effects on climate and the resulting environmental and human impacts. The primary greenhouse gases (GHGs), carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), are emitted into the atmosphere from a myriad of human activities such as energy supply, manufacturing, transportation, commercial and residential buildings, and waste. Additionally, management activities on agricultural and forest lands can influence GHG emissions substantially. Even though GHGs can be released into the air via the sectors mentioned, GHGs, especially CO₂, can be removed from …

Deterministic Neutron Transport And Multiphysics Experimental Safety Analyses At The High Flux Isotope Reactor, Christopher James Hurt

Doctoral Dissertations

The computational ability to accurately predict the conditions in an experiment under irradiation is a valuable tool in the operation of a research reactor whose scientific mission includes isotope production, materials irradiation, and neutron activation analysis. Understanding of different governing physics is required to ascertain satisfactory conditions within the experiment: the neutron transport behavior throughout the reactor and the coupled behavior of heat transfer, structural mechanics and fluid flow. Computational methods and tools were developed for robust numerical analysis of experiment behavior at the Oak Ridge National Laboratory (ORNL) High Flux Isotope Reactor (HFIR), including fully-coupled thermo-mechanics in three plutonium-238 …

Development, Synthesis, And Analysis Of Surrogate Post-Detonation Nuclear Melt Glass, Andrew Vincent Giminaro

Doctoral Dissertations

With the threats facing the world today, there is an ever-increasing need for training the the fields of radiochemistry and nuclear forensics. Training and research in these fields requires reference materials that accurately represent materials that could potentially be encountered. Unfortunately, many of the historical samples of debris from nuclear weapons tests remains classified. Because of this, there is a need for realistic surrogates. This research focuses on the development of surrogates for the bulk and particulate nuclear melt glass that is expected to be found in an urban setting after a nuclear event.

A mathematical model for the creation …

Ecology Of Organohalide-Respiring Dehalococcoides Mccartyi: Corrinoid Cofactor-Related Community Interactions And Controls Over Strain Selection, Burcu Şimşir

Doctoral Dissertations

Organohalides such as tetrachloroethene (PCE) and trichloroethene (TCE) are among the most prevalent toxic groundwater contaminants. Remediation of organohalide-contaminated sites has high priority, and efficient and cost-effective remedies are needed to prevent environment and human exposure through contaminated water. Bacterial organohalide-respiration plays a major role in organohalide detoxification. Dehalococcoides mccartyi (Dhc) are key mediators in bioremediation, since only Dhc strains have been documented in complete detoxification of chlorinated ethenes to benign ethene. Dhc depends on other microorganisms in the environment for essential growth requirements (e.g., hydrogen and vitamins). For successful implementation of the reductive dechlorination to remediate contaminated …

Young Children’S Social Connections: Characteristics Of Social Networks And Types Of Support, Daniela Andrea Salinas Maturana

Doctoral Dissertations

Most researchers agree about the importance of having a rich network of relationships and adequate support system. However, a limited number of studies have focused on young children’s social support networks or have examined the role that culture plays in shaping these relationships. This dissertation includes three manuscripts that address distinct aspects of children’s social support networks, guided by Bronfenbrenner’s Bioecological perspective. The objectives of the first manuscript are twofold. First, a systematic literature review was conducted to determine the current state of knowledge related to children’s social support networks. The results from this review revealed that further examination of …

Antibacterial Activity And Chemical Characterization Of Resin From Sciadopitys Verticillata (Thunb.) Siebold And Zuccarini, David Ira Yates

Doctoral Dissertations

Sciadopitys verticillata produces white viscous resin that is unique among the conifers. This research investigated effects of resin on bacteria from different ecological niches and the chemical composition of the resin. Each bacterial species was evaluated separately for response to winter- and summer-collected resins. Exposure to winter-collected resin reduced numbers of colonies of Bacillus cereus, Erwinia amylovora, Agrobacterium tumefaciens, and Escherichia coli and increased numbers of Xanthomonascampestris, Pseudomonas fluorescens, and Pseudomonas syringae. Summer-collected resin affectedpopulation growth of two bacterial species; population counts of E. amylovora decreased and those of P. fluorescens increased. Selected strains of …

Bioremediation Of Chlorinated Ethenes: Ph Effects, Novel Dechlorinators And Decision-Making Tools, Yi Yang

Doctoral Dissertations

Chlorinated solvents have been widely used in different areas of modern society. Usage of these chlorinated solvents was not necessarily accompanied with proper handling and disposal of these hazardous compounds, which caused a variety of environmental problems and continues to affect human health. Remediation of chlorinated ethenes contaminated sites has high priority for state regulators and site owners. Among the available treatment technologies, bioremediation shows great promise as a cost-effective corrective strategy for a variety of environmental pollutants. Prerequisites are that the microbiology involved in contaminant degradation and geochemical factors, such as pH, are understood, so that bioremediation technologies can …

Stories Of Success: A Phenomenological Study Of Positive Transformative Learning Experiences Of Low-Socioeconomic Status Community College Mathematics Students, John Thomas Smith

Doctoral Dissertations

All too often education research focuses on academic disparities with under-served student populations. Frequently, both remedial and introductory college-level mathematics courses are cited as gatekeepers or insurmountable barriers for adult low-socioeconomic status (LSES) students. There has been a call from within the mathematics education community for less gap-gazing at disparities and more studies of success within marginalized groups. Many previously unsuccessful, under-prepared, under-served, and under-supported students persist and eventually succeed. In addition, there is a lack of research through the lens of the community college as a unique educational context, distinct from both K-12 and the four year colleges and …

Studies Of Uncertainties In Smart Grid: Wind Power Generation And Wide-Area Communication, Can Huang

Doctoral Dissertations

This research work investigates the uncertainties in Smart Grid, with special focus on the uncertain wind power generation in wind energy conversion systems (WECSs) and the uncertain wide-area communication in wide-area measurement systems (WAMSs).

For the uncertain wind power generation in WECSs, a new wind speed modeling method and an improved WECS control method are proposed, respectively. The modeling method considers the spatial and temporal distributions of wind speed disturbances and deploys a box uncertain set in wind speed models, which is more realistic for practicing engineers. The control method takes maximum power point tracking, wind speed forecasting, and wind …

Exploring The Professional Identity Development Of Counselors-In-Training Through Experiential Small Groups, Amanda Christine Dediego

Doctoral Dissertations

The concept of professional identity of counselors is a recent area of focus within the counseling profession. The Council for Accreditation of Counseling and Related Educational Programs standards for counselor education programs of all specialties reflect the trend towards establishing a strong professional identity for counselors. One factor shown to be influential in professional identity development has been experiential learning opportunities, which allow counselors-in-training to develop an individual professional identity through application of educational content in real-world scenarios. The literature suggests experiential learning is a pivotal opportunity for professional identity development for entry-level counseling students. One opportunity for experiential learning, …

Family Experiences With Standardized Assessments Leading To Participation In The Opt Out Movement, Christy Lee Evans

Doctoral Dissertations

With the hope of giving voice to individuals who are usually left out of conversations regarding standardized assessments—the families who live with the effects of those tests on their children—this study was designed to answer the following research questions:

1) Who are some of the individuals who are participating in the opt out movement?

2) How are some individuals making the decision to participate in the opt out movement?

a) What knowledge do these individuals who are participating in the opt out movement have regarding the standardized assessments that their children are being given in public schools?

b) How have …

Innovative Electrode Nanocomposites For Energy Storage And Conversion Systems, Yiran Wang

Doctoral Dissertations

Nanocomposites emerged as suitable alternatives for electrode materials, are defined as “two or more materials with different properties remain separate and distinct on a macroscopic level within one unity and with any dimension in any phase less than 100 nm”. Recently, polymer/carbon based nanocomposites have attracted significant research interests for energy applications due to their multi-functionalities, improved structure stability and ease of production. This dissertation work focusing on the development of innovative electrode nanocomposites for proton exchange membrane fuel cell, supercapacitor and electrochromic applications.

Chapter 1 is an introduction. Chapter 2 & 3 focus on the synthesis of Pd-based nanocatalysts …

Beta-Delayed Neutron Data And Models For Scale, Kemper Dyar Talley

Doctoral Dissertations

Recent advancements in experimental and theoretical nuclear physics have yielded new data and models that more accurately describe the decay of fission products compared to historical data currently used for many applications. This work examines the effect of the adopting the Effective Density Model theory for beta-delayed neutron emission probability on calculations of delayed-neutron production and fission product nuclide concentrations after fission bursts as well as the total delayed neutron fraction in comparison with the Keepin 6-group model. We use ORIGEN within the SCALE code package for these calculations. We show quantitative changes to the isotopic concentrations for fallout nuclides …