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Modeling The Momentum And Mass Transfer Within A Micro-Scale Polymer Electrolyte Membrane Fuel Cell For Flows Within The Slip Flow Regime, Sean Tamarun Goudy

Dissertations

Polymer Electrolyte Membrane (PEM) fuel cell systems are heterogeneous catalytic systems. Although there are many computational models that describe the behavior of PEM fuel cells, few simulate the catalyst surface concentration of reactant gases at the catalyst layer-membrane layer inteface. Most PEM fuel cell models make no distinction between the bulk concentration of reactants and the catalyst surface concentration of reactants. It is the surface concentration that is key when studying PEM fuel cell systems: the reactions occur at the surface of the catalyst.

In addition, few model the dynamics within the non-continuum flow region near the solid surfaces of …

The Cognitive Load Impacts Of Assistive Technology Devices Used By Sighted Teachers In Training During Literary Braille Instruction, Charles Redden Farnsworth

Dissertations

The purpose of this study was to explore differences in perceived cognitive load experienced by sighted teachers-in-training using manual or electronic braille assistive technology devices to learn literary braille. Ninety-four participants from 18 personnel preparation programs across the United States and Canada participated in this study. Data were collected between August 2008 and June 2009 using the NASA-Task Load Index, the National Literary Braille Competency Test, and semi-structured interviews.

There were no statistically significant differences found between the technology groups in the quantitative measures of cognitive load or in literary braille proficiency according to the National Literary Braille Competency Test …

Competing Formal And Informal Institutions In A Democratizing Setting: An Institutional Analysis Of Corruption In Romania, Mihaiela Ristei

Dissertations

This dissertation explores the interaction between formal institutions and the informal institution of corruption in Romania from 1997 until 2006. I argue that corruption is an informal institution that creates incentives incompatible with the formal rules, alters the effectiveness of formal institutions, undermines the rule of law, and threatens democratic consolidation. Specifically, I test the capacity of formal institutions to counteract the informal institution of corruption and thus to reduce corruption in four sectors: the judiciary, customs, health care, and public procurement. The research project investigates the methods to restructure incentives and increase the effectiveness of formal institutions, the factors …

Libel In Mississippi, 1798-1832, Muriel Ann Everton

Dissertations

The Mississippi Territory officially became part of the United States in 1798. The territory was to be governed under the rules of the Northwest Ordinance, but those who went to govern the area found a culture that required the use of common law to settle the disputes arising from prior governments under other nations. With no precedents on which to rely, disputes led, at first, to dueling and then to libel cases. Both common law and common sense prevailed while many of the disagreements were aired publicly in newspapers. Mississippi’s first printer, Andrew Marschalk, using his First Amendment rights, wrote …

What Role For Ethnicity? Political Behavior And Mobilization In Post-Conflict Sierra Leone And Liberia, Fodei Joseph Batty

Dissertations

This dissertation examines political behavior in Sierra Leone and Liberia following the end of their civil wars. Dominant theories on politics in African societies suggest that ethnic interests underpin political behavior and elections are mere censuses of ethnic support for co-ethnic party elites. Yet, while using a proportional representation electoral system that is expected to result in splintered vote shares for multiple political parties, Sierra Leone's elections in 2002 concentrated votes around one presidential candidate and political party. Conversely Liberia's elections in 2005, held using a first-past-the-post electoral system that expectedly discourages multiple vote shares, diffused votes among several political …

The Lipid Acyl-Chain Dynamics In Giant Liposomes And Characterization Of Domain 4 Of The Wilson Disease Protein, Wilson Okumu

Dissertations

Steady-state and nanosecond time-resolved fluorescence of the nitro-2, 1, 3- benzoxadiazol-4-yl (NBD) probe and line tension force were determined in phospholipids acyl-chain dynamics in giant liposomes made from a homologous series of phosphatidylcholines (PC). The fluorescence spectroscopy of a NBD probe attached to the headgroup (NBD PE) or the tail (NBD PC) of the phospholipid were used to determine the rate of dithionite quenching in a homologous series of phospholipids. Similar experiments were performed in the gel and the fluid phases of the l,2-dimyristoyl-s«-glycero-3-phosphocholine (DMPC ). Nanosecond time scale lifetimes and anisotropy measurements were obtained by a 470 nm LED …

Optimizing Green Sand Properties Of Fluidized Sand From Aeration And Developing New Green Sand Testing Technique, Ananda Mani Paudel

Dissertations

Aeration sand filling is a new molding technique in foundry. Using this technique, sand with smooth flow can be filled in any orientation and shape using low-pressure air. This is not possible by conventional gravity and high-pressure blow filling techniques. Aeration was introduced as an energy-efficient and environmentally- friendly sand molding technique. In addition, aeration has its niche on quality of molds it could produce. Friability, one of the crucial green properties for the quality mold was significantly low in aeration in comparison to the gravity and high-pressure blow filling. The fluidization action in aeration acted upon the sand clay …

The In-Situ Removal Of Menthofuran From Peppermint Oil And Subsequent Reactions Of The Solid-Supported Adduct, Robert Joseph Justice Ii

Dissertations

Menthofuran is an aromatic heterocyclic compound found naturally in the essential oil of Mentha piperita L. or peppermint. Natural peppermint oil may contain between approximately 2 to 8% menthofuran.

Peppermint oil is a complex mixture of over 350 identified chemical compounds; market demands dictate the extent of processing the oil undergoes prior to being introduced into consumer goods. Menthofuran has long been known to readily autoxidize, either alone or within the peppermint oil matrix, leading to a discolored oil with negative organoleptic consequences that adversely affects its commercial viability. Therefore, a facile method for selective removal of menthofuran was developed …

Job Satisfaction Of University Chief Student Conduct Administrators And Their Intent To Stay Or Leave The Position, Suzie Nagel-Bennett

Dissertations

Chief student conduct administrators within higher education are responsible for administering and enforcing standards of student conduct, and navigating the vast legal, political and developmental components to fortify the ethical climate and academic integrity of institutions. Although some previous research regarding these individuals and their role does exist, no research to date could be found regarding their job satisfaction at four year public institutions in the United States. This study serves as the first research to examine overall job satisfaction, the level of satisfaction on stated intrinsic and extrinsic variables within the framework of Herzberg's (1966) dual-factor theory, and the …

Examining The Relationship Between Standard Tests, Experiential Learning Strategies, Student-Centered Teaching Attitudes, And Student Achievement In Communication Arts, Joann Clay

Dissertations

The purpose of this collaborative research study was to examine the relationship between standard tests, experiential learning strategies, student-centered teaching attitudes, and student achievement in Communication Arts. Each researcher took primary responsibility for the quantitative data (survey responses based on a Likert Scale and Missouri Assessment Program [MAP] and the qualitative data [open-ended questions, responses, and classroom observations of teachers]). This study was based on a collaborative effort in identifying the existence of teaching factors which could increase student achievement on the MAP test. The MAP test is one of several educational reforms mandated by the No Child Left Behind …

Opt Out: Women With Children Leaving Mid-Level Student Affairs Positions, Dana Hebreard

Dissertations

This phenomenological study is about the decision-making process of women with young children at the mid-level student affairs position who decide to opt out of their career for a minimum of one year, and for some, return to higher education. The study is based on interviews with 17 mid-level college administrators and mothers of young children, infant to pre-teen, who chose to opt out of their careers rather than continuing to balance family and career. Though the individuals interviewed were each unique in their socioeconomic status, education, and career path, their issues and concerns were similar. They openly revealed the …

A History Of The American Film Institute, Deborah Jae Alexander

Dissertations

The American Film Institute (AFI) is a highly politicized, powerful organization. To date, most historical documentation and recording of AFI events and activities has been disseminated to the mass media from within the organization through its own publications or in other historical documentation as incidental history in relation to another topic. This dissertation, written as an overview, is the first comprehensive, independent historical examination of the AFI. The examination begins with an exploration of the development, activities and decline of the American Council on Education‟s original AFI and other film organizations that existed prior to the present day AFI. It …

High-Stakes Testing And Its Relationship To Stress Levels Of Secondary Teachers, Sonya Colman Christian

Dissertations

This study investigated the relationship between high-stakes testing and the stress levels of secondary teachers in Jackson’s Jackson Public School District. The independent variables of age, gender, subject taught, teaching experience, degree and school level were used to determine the differences of the various groups. A survey was piloted and used to determine teachers’ levels of stress. There was not a statistically significant difference between the stress levels of teachers who teach subjects that are measured by high-stakes testing and those who do not. There also was not a statistically significant difference between the stress levels of veteran teachers and …

Cryptid, Phillip Jarett Underwood

Dissertations

Cryptid is a term from the field of cryptozoology, which ostensibly presents itself as the study of creatures that may or may not exist, such as – but not limited to – Bigfoot, the Loch Ness Monster, and the Jersey Devil. The term itself, cryptid, refers to one of these unknown creatures. The novella presented here concerns a half-Native American man and his struggle to know not only his dead parents, but himself and his place in the world. While cryptids play a minor role within the boundaries of the narrative itself, the novella concerns itself more with the ways …

Comparison Of Teaching Strategies On Teaching Drug Dosage Calculation Skills In Fundamental Nursing Students, Jaclynn Suzanne Huse

Dissertations

No abstract provided.

`You Know I Hate It When People Half Ass Things': A Case Study Of A High School Science Student And The Role Of Pre-Instructional Activities, Goal Orientation, And Self-Efficacy In Learning With Simulations, Samuel Arthur Helms

Dissertations

No abstract provided.

Process Evaluation Of The Instant Word Notebook, Jeannie Ellen Roberts

Dissertations

This program evaluation of The Instant Word Notebook was conducted by two educators who created an instructional tool to teach and assess the most frequently occurring words in written text, commonly known as Instant Words. In an effort to increase the reading scores of first and second grade students, teachers were instructed to teach Instant Words. It was observed that teachers exposed students to Instant Words, but had no systematic process to teach and assess Instant Words for mastery. The purpose of The Instant Word Notebook was to teach and assess mastery of Instant Words to first and second grade …

Towards Multiplexed Electrogenerated Chemiluminescent Detection, Shijun Wang

Dissertations

The main objective of this dissertation is to understand and study the principle of electrogenerated chemiluminescence (ECL) and its applications to detect biomolecules simultaneously. Four aspects of ECL were studied. In order to carry out multiplexed ECL detection, both classical and several novel ECL systems have been investigated.

In the first aspect, significant effect of chloride ions on the ECL behavior of the tris(2,2′-bipyridyl) ruthenium(II) (Ru(bpy)3 2+)/tri-n-propylamine (TPrA) system at Au electrode was investigated. At low concentrations (e.g., [Cl-] < 5 mM), the ECL was enhanced; at relatively high concentrations, however, the ECL intensity decreased with the increase of the [Cl-]. At [Cl-] = 90 mM, ~ 50% and 100% ECL inhibition was observed for the first and the second ECL wave, respectively. The electrogenerated chloroaurate anions (AuCl2 - and AuCl4 -) which were verified using an electrochemical quartz-crystal microbalance (EQCM) method were found to be responsible for the ECL inhibition. This study suggests that care must be taken when Au working electrode is used for ECL studies in chloride-containing buffer solutions (widely used in DNA probes) and/or with the commonly used chloride-containing reference electrodes since in these cases the ECL behavior may significantly disagree with that obtained using other electrodes and reaction media.

In the second aspect, the electrochemical behavior of a trinuclear ruthenium(II)- containing complex, [((phen)2Ru(dpp))2RhCl2]5+ (where phen = 1,10-phenanthroline, dpp = 2,3-bis-2-pyridylpyrazine), …

Soccer Penalty Kick Pre-Impact Cues Of Male Right-Footed High School Soccer Players, Jason Ryan Jones

Dissertations

The purpose of this study was to use direct observation methods to collect evidence of pre-impact cues in a soccer penalty kick and to analyze their predictive powers in determining shot direction. The five pre-impact cues were position of the approachru n, alignmento f the hips,leano ftrunk, placemenot f non-kickingf oot, and actiono f the non-kickings idea rm.V ideo wasc ollecteda ndt hena nalyzedu singa Dartfishrn tagging panel. There were a total of fifty male high school right-footed participants.C oachesfr om areah igh schools occert eamsp rovidedt heir top penaltyk ick takerst o participatein the study.V ideo wasc ollectedo n …

Self-Assembly And Gold Nanoparticle Cross-Linking Of Stimuliresponsive Block Copolymers Synthesized Bt Reversible Addition-Fragmentation Chain Transfer Polymerization, Adam Eugene Smith

Dissertations

The ability of amphiphilic block copolymers to self-assemble into various morphologies in aqueous solution in response to specific stimuli has attracted widespread interest for potential applications as targeted drug delivery and diagnostic vehicles. Stimuli-responsive block copolymers afford a facile method for tuning the hydrophilic mass fraction to provide access to various solution morphologies. Reversible additionfragmentation chain transfer (RAFT) polymerization provides the ability to prepare stimuli-responsive block copolymers while maintaining precise control over the macromolecular characteristics (molecular weight, copolymer composition, functionality, etc.) that dictate nanostructure morphology.

This work may be divided into four sections. In the first section the synthesis and …

Synthesis Of Functional Copolymers Via Aqueous Raft Polymerization For Bioconjugation And Targeted Delivery Of Small Interfering Rna, Adam Wesley York

Dissertations

The versatility of reversible addition-fragmentation chain transfer (RAFT) polymerization has moved this controlled radical technique to the forefront of copolymer construction for bioapplications including polymeric drug/gene delivery vehicles. Strengths of the RAFT process include the capacity to control the polymerization of a wide variety of vinyl monomers under mild conditions, its tolerance to numerous chemical groups that allow the preparation of functional copolymers for facile modification, and the range of copolymer architectures with predetermined end group functionalities which may be synthesized. Given these strengths, RAFT polymerization was utilized in this research to synthesize functional/reactive copolymers for bioconjugation and targeted delivery …

Impact Of Golf Video Games On Teaching Golf In Physical Education, Ann Pohira-Vieth

Dissertations

Although technology has become an integral part of many classrooms across the country, the incorporation of technology through the use of video games in physical education is also becoming a mainstay in multiple school districts. In West Virginia public schools, Dance Dance Revolution (DDR) has entered the physical education classrooms as a way to help curb obesity (“Study Shows Video,” 2008). Schools in Arkansas, Missouri and Hawaii have also followed suit by adding DDR to the physical education curriculum (Gallaway & Lauson, 2006). Even though the incorporation of video games into educational programs is becoming more prevalent, there is a …

The Quality Of Student Experiences In Traditionally Scheduled Courses Versus Block Scheduled Courses At Pearl River Community College, David Scott Alsobrooks

Dissertations

The purpose of this study was to determine if students at Pearl River Community College (PRCC) achieve significantly different self-reported Quality of Effort levels when enrolled in block scheduled programs than students enrolled in traditionally scheduled programs. This study focuses on Career and Technical Education (CTE) programs at PRCC in the spring of 2009. The Community College Student Experiences Questionnaire was completed by 294 (192 traditional and 97 block) students of the 672 (514 traditional and 143 block) total students enrolled in CTE programs during the term. No significant differences were found in the students’ self-reported Quality of Effort levels …

Preservice Teachers’ Attitudes, Familiarity, Use, And Perceived Applicability Of Content Area Reading Strategies, Bridgette Ladonna Davis

Dissertations

The influence of field based-experiences in K-12 classroom and grade level licensure area on preservice teachers’ attitudes, familiarity, use, and perceived applicability of content area reading instruction was examined for 597 participants from three state-supported universities in a southeastern state in the United States. These participants who were seeking either K-6 or 7-12 licensures represented three levels of field-based classroom experience: (a) no field-based experience, (b) some non-sustained field-based experience, and (c) a full-semester of field-based experience. Data were collected using a demographic questionnaire and two instruments, the Attitudes toward Content Area Reading (ATCAR) questionnaire and the Content Area Reading …

Later Life Decision-Making: Experiential Adult Learning And Successful Aging, Shauna Pearce Breland

Dissertations

The focus of this study was on how aging adults make critical life decisions such as those involving health care and health care benefits, living arrangements for later life, and organizing personal affairs. The participant group consisted of 8 sexagenarians and 4 septuagenarians who had recently made or were currently making these critical life decisions.

The study employed both qualitative and quantitative methods. A qualitative phenomenological approach was used to allow the researcher to examine the phenomena of decision-making and aging within the context of the life experiences of the individuals being studied. Each subject participated in a single in-depth …

Aqueous Raft Synthesis Of Stimuli-Responsive, Amphiphilic Block Copolymers And Self-Assembly Behavior In Solution And Incorporation Into Lbl Films, Matthew Grady Kellum

Dissertations

Of all the living radical polymerization techniques, reversible addition– fragmentation chain transfer (RAFT) polymerization is arguably the most versatile in terms of the reaction conditions (e.g. temperature and solvent selection), monomer selection (e.g. neutral, anionic, cationic, and zwitterionic), and purification. Since the introduction of RAFT in 1998, the McCormick research group and others including the Lowe, Sumerlin, and Davis research groups have synthesized a wide range of (co)polymers with predetermined molecular weights, low polydispersities, and advanced architectures utilizing aqueous RAFT (ARAFT) polymerization. These research groups have also studied how various block copolymers exhibit stimuli-responsive behavior due to a change in …

Rational Design Of Self-Assembled Nanostructures Based On Polymers Synthesized Via Aqueous Reversible Addition-Fragmentation Chain Transfer Polymerization, Stacey Kirkland York

Dissertations

Recent advances in reversible addition-fragmentation chain transfer (RAFT) polymerization have allowed the rational, bottom-up design of biorelevant assemblies. Utilizing foresight, polymers can be tailored to self-assemble into nano-, micro-, and macroscopic structures. Given the size scale on which rationally-designed polymers can be tailored, they hold significant promise in the biomedical field. For example, nanoscale materials can be designed to carry small-molecule and gene therapeutics while macroscopic structures can be tailored for cell growth scaffolds. The design process begins by selecting monomers, chain transfer agents, and reaction conditions which will yield the desired polymer architecture and composition.

The work herein builds …

Developing A Biosensor For The Detection Of Bacteria: A Comparison Of Methods For Isolating Bacteria-Specific Antibodies, Scott Allen Walper

Dissertations

The antigen-antibody interaction is known to be a high affinity and highly specific interaction that can readily be used for the detection and identification of biological and chemical agents. These studies were conducted to develop an efficient and cost-effective method of obtaining bacteria-specific antibody molecules for integration into a fielddeployable biosensor. Antigen-binding molecules were obtained both as full-length IgG molecules from a hybridoma cell line and as recombinant single-chain Fv (scFv) antibodies isolated from naïve and immunize libraries. Monoclonal and recombinant antibody systems were compared on the effectiveness of producing new, target-specific molecules; the efficiency of production and purification of …

The Relative Value Of Online Learning Environments As Perceived By High School Teachers, Daryl Joe Scoggin

Dissertations

Online learning environments have become more popular for use in education from year to year. This medium for teaching and learning has been successfully used in higher education for years. Only within the past decade has this instructional platform made its way into the P-12 arena. With the expansion of online learning environments becoming more popular, this type of lesson delivery may eventually make its way to the building or site level. As in a face-to-face classroom, teachers have an effect on the success of the students. The perceptions of teachers regarding dimensions of implementation and use of online learning …

Perceived Reliable Sources Of Reading Instruction Information Selected By Kindergarten, First, Second, Third, Fourth, And Fifth Grade Teacher-Practitioners, Janet Kimberly Biglane-Hodges

Dissertations

The teacher is considered the most important factor in student success. With increased emphasis on research-based information through federal legislation, teachers struggle selecting credible methods and procedures among available reading instruction sources confounding the possibility of student achievement. Teacher self-knowledge, peer teachers, administrators, professional development, and the Internet are accessible sources for educators in regard to obtaining reading instruction information. Research in the field of education suggests teacher-practitioners procure and implement retrieved reading instruction information based on two factors: existing teacher beliefs regarding reading instruction and support of implementation of the method or practice within the school climate. This study …