Digital Commons Network^™

Earth Abundant Thin Film Technology For Next Generation Photovoltaic Modules, Githin Alapatt

All Dissertations

With a cumulative generation capacity of over 100 GW, Photovoltaics (PV) technology is uniquely poised to become increasingly popular in the coming decades. Although, several breakthroughs have propelled PV technology, it accounts for only less than 1% of the energy produced worldwide. This aspect of the PV technology is primarily due to the somewhat high cost per watt, which is dependent on the efficiency of the PV cells as well as the cost of manufacturing and installing them. Currently, the efficiency of the PV conversion process is limited to about 25% for commercial terrestrial cells; improving this efficiency can increase …

Spatial Distribution And Genetic Variability Of Reniform And Lance Nematodes In Cotton Agroecosystems, Claudia Holguin

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Rotylenchulus reniformis (reniform nematode) and Hoplolaimus columbus (Columbia lance nematode) are two of the main plant-pathogenic nematode species affecting cotton production in the United States. For the selection and implementation of effective management practices it is important to understand distribution patterns and population genetic structure of these two nematodes in cotton agroecosystems. In a three-year field study, the spatial distribution of reniform nematode was characterized in two commercial fields in South Carolina to determine the effects of relations with soil texture and crop rotation on reniform nematode distribution (Chapter 1). Results of this project suggest that population densities of reniform …

Numerical Decoding, Johnson-Lindenstrauss Transforms, And Linear Codes, Yue Mao

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Many computational problems are related to the model y = Ax + e, including compressive sensing, coding theory, dimensionality reduction, etc. The related algorithms are extremely useful in practical applications for high performance computing, for example, digital communications, biological imaging and data streaming, etc. This thesis studies two important problems. One problem is related to efficient decoding for Reed-Solomon codes over complex numbers. In this case, A and y are given, and the goal is to find an efficient stable algorithm to compute x. This is related to magnetic resonance imaging (MRI). The other problem is related to fast algorithms …

The Emotional Impact Of Teaching In A High Poverty School On First-Year, Early Childhood Teachers In Rural South Carolina: A Photo Elicitation Study, Kimberly Jedlicka

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The purpose of this research study was to understand the emotional impact of teaching in a high poverty school on first-year, early childhood teachers in rural South Carolina. The research also explored the extent to which these emotions either empowered or constrained the teachers in their work. The study used photo-elicitation with interviews to generate data. Participants in this study took photographs that represented emotional experiences, wrote captions and discussed their images in an interview session. The data analysis focused on honoring the participants' voices and included first and second cycle coding strategies. In Vivo coding and Emotion coding were …

The Depressing Of China's Economy: The Effect Of Rural---Urban Educational Inequality And Absence Of Land Market, Huayong Zhou

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This paper argues that too many workers were placed in traditional agricultural sector in China's economy after 1978. I investigate two factors which hindered the labor mobility from agricultural and non-agricultural sector: (1) human capital dierence between rural and urban workers brought by China's urban oriented public educational policy; (2) absence of land property rights and a well functioning land market. I incorporate those two frictions into a two-sector dynamic macro model. I calibrate the model and show that it provides a good fit for the evolution of GDP per-capita and employment share in agriculture in the Chinese economy. I …

The Black Baptist Denomination Of South Carolina: A Social Capital Analysis, Sheila Snoddy

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The question of the Black church's relevancy, power, and influence has been at the forefront of theological and social debates since the Civil Rights era. The continuation of these debates in the 21st century has postulated that today's Black church has become less theologically grounded and less vision-driven in initiatives and movements and is becoming ineffective advocates in addressing the social ills and challenges that cripple the upward mobility of individuals and communities. This study attempts to support the hypothesis that the Black church still possesses the relevancy, power, and influence as a vital and progressive community institution for positive …

Gender And Ethnicity Classification Using Partial Face In Biometric Applications, Jamie Lyle

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As the number of biometric applications increases, the use of non-ideal information such as images which are not strictly controlled, images taken covertly, or images where the main interest is partially occluded, also increases. Face images are a specific example of this. In these non-ideal instances, other information, such as gender and ethnicity, can be determined to narrow the search space and/or improve the recognition results. Some research exists for gender classification using partial-face images, but there is little research involving ethnic classifications on such images. Few datasets have had the ethnic diversity needed and sufficient subjects for each ethnicity …

Toward Understanding The Thermodynamics And Mechanisms Of Actinide Sorption Reactions, Shanna Estes

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The environmental fate of actinides is greatly influenced by interfacial reactions, including sorption onto solid surfaces. Because changes in the primary hydration sphere of the actinide are expected to greatly influence the thermodynamics (i.e., reaction enthalpy and entropy) of these reactions, examining actinide sorption thermodynamics may provide insight into actinide sorption mechanisms. Additionally, examining actinide sorption thermodynamics may enhance the ability to model or predict these reactions in environmental or engineered systems where variable or elevated temperatures are expected. However, few researchers have studied actinide sorption thermodynamics. Therefore, this research examined the thermodynamics of Eu(III) (a trivalent actinide analog), Th(IV), …

Sustainable Heritage Tourism: A Tourist-Oriented Approach For Managing Petra Archaeological Park, Jordan, Mohammad Alazaizeh

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Although sustainability of heritage tourism has become a major concern from the perspectives of both academics and practitioners, the majority of research and studies have tended to understand the cultural and educational issues of heritage tourism rather than focusing on the application of sustainability in a practical context. To achieve sustainability in heritage tourism, heritage sites should be managed effectively in a way that ensures preservation of heritage resources and provides quality experiences to the tourists. Traditionally, heritage tourism planning and management relied on a top-down, professional-led approach that ignores the interests of different stakeholders (e.g., heritage tourists) in heritage …

Assessment Of The Effect Of Sustainability Practices On Financial Leakage In The Hotel Industry In Jordan, Nidal Alzboun

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ABSTRACT Tourism revenues are not an accurate indication of the financial impact of this industry because in some cases a proportion of the profits leaves the host country for various reasons, resulting in what is referred to as leakage. The research reported here investigates this issue in connection with the sustainability practices of hotels in Jordan, one of the strategies firms and governments can adopt to enhance performance and to address problems related to environmental, community, and economic development adding a novel contribution to the tourism literature. A mixed method approach was used to collect and analyze the data obtained …

Ahr-Related Activities In A Creosote-Adapted Population Of Adult Atlantic Killifish, Fundulus Heteroclitus, Two Decades Post-Epa Superfund Status, Josephine Wojdylo

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Atlantic killifish, Fundulus heteroclitus, have adapted to, or at least developed a level of resistance to creosote-based polycyclic aromatic hydrocarbons (PAHs) found at the Atlantic Wood (AW) superfund site in the southern branch of the Elizabeth River, VA USA. Historically, 90+% of the mummichogs at this site have hepatic lesions of varying severity, and 30+% of these fish have tumors of various origin. Many xenobiotics, including select PAHs found at the Atlantic Wood site, are ligands for the aryl hydrocarbon receptor (AhR), which is a promiscuous ligand-dependent transcription factor involved in developmental regulation, environmental sensing, and induction of a suite …

Effects Of Transportation Hazards On Package Performance And Food Product Shelf Life, Kyle Dunno

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This research studied the effect of transportation hazards on food product shelf life and package performance. Studies were conducted to determine the effect of package headspace volume, product viscosity and storage temperature on package integrity. Finally, accelerated shelf life testing (ASLT) was utilized to determine how simulated transportation hazards affected the shelf life of a specific food product. Institutional retort pouches containing either water or 5% starch solution were filled with varying amounts of headspace volume to determine if package headspace volume could aid in package performance during simulated engineering tests for packaged products. Fixed displacement vibration testing and compression …

Synthesis And Characterization Of Chemically Functionalized Shape Memory Nanofoams For Unattended Sensing Applications, Anna Paola Soliani

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The work in this dissertation is devoted to the synthesis and characterization of novel materials for off-line unattended sensing: shape-memory grafted nanofoams. The fabrication process and characterization of highly efficient, polymeric nanosensor element with the ability to selectively detect analytes and retain memory of specific exposure events is reported. These shape memory nanofoams could potentially act as efficient and highly sensitive coatings for evanescent waveguide-based optical monitoring systems. On exposure to specific analytes, the polymeric coatings locally change their internal structure irreversibly at the nanolevel, affecting the local optical properties such as refractive index. Currently, enrichment polymer layers (EPLs) are …

Trust In Self, Trust In Others: The Impact Of Emotions On Advice Behavior, Benjamin Slade

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This dissertation proposes that task-specific self-confidence, trust in motives, and trust in competency are the three main drivers for advice use and willingness to pay for advice. After developing this general argument, the paper then focuses on how emotions influence advice use and willingness to pay for advice. Furthermore, this paper argues that the influence of emotions on advice is partially mediated by task specific self-confidence, trust in motives, and trust in competency. This model elaborates on the underlying emotional mechanisms which may guide the mediation paths, and then tests this expected pattern with four different incidental emotions; regret, pride, …

Neutron Study Of Structure And Dynamics Of Rigid Polymers, Naresh Osti

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The structure and the dynamics in two different classes of rigid polymers; ionomers and rigid luminescent polymers, have been investigated predominantly by neutron techniques. Rigidity of the backbones of both polymers affects their properties. For ionomers, it affects transport pathways, therefore, their applications for energy and separation membranes. In luminescent polymers, it determines the conformations of the chains and their electro-optical response. One group of the polymers consists of rigid hydrophobic para-phenylene backbone decorated with pendant phenyl side chains functionalized with sulfonic acid (SPP). The other family of polymers consists of poly para-phenyleneethynylene (PPE) backbone that becomes conjugated upon conformational …

Efficient And Reliable Simulation, Memory Protection, And Driver Generation In Embedded Network Systems, Jiannan Zhai

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Embedded systems are widely used, from consumer electronics, to industrial equipment, to spacecraft. With embedded systems becoming more complex, new challenges are presented to application developers. In this dissertation, we focus on three of the most important: (i) Network simulation tools are widely used for sensor network testing and evaluation. Simulation performance affects the efficiency of the application developers who use these tools. The performance of a single host system represents a performance bottleneck for large-scale network simulation. A distributed simulator offering higher performance is needed to support fast, large-scale network simulation. (ii) Single event upsets (SEUs), which occur when …

The Influence Of Mindfulness During The Travel Anticipation Phase On Search And Choice Behaviors, Search And Choice Outcomes, And Trip Evaluations, Lorraine Taylor

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Anticipation is the first travel phase (Clawson & Knetsch, 1966) and consists of the vacation planning process. Tourists may exhibit varying levels of mindfulness during this phase. Mindfulness is associated with analytic decision making through a heightened sensitivity to one's environment and openness to new information (Langer & Moldoveanu, 2000). This study considered the influence that mindfulness during the travel anticipation phase has on: search and choice behaviors, search and choice outcomes, and trip evaluations. Analysis was also conducted to determine if there was a significant influence on the relationships based on the mediating effect of the amount of the …

Surface Modifications Of Capillary-Channeled Polymer (C-Cp) Fiber Stationary Phases: Improving The Efficiency Of Highly Selective Analyte Separations, Abby Schadock-Hewitt

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High performance liquid chromatography (HPLC) is a fundamental methodology for the characterization and purification of macromolecules. Since its development in the 1970's, HPLC has significantly advanced its instrumentation and column technology to become a powerful analytical technique. A considerable amount of research focuses on advancements to the stationary phase, or solid support, on which molecules interact and separate. To overcome limitations of other phases that lead to poor mass transfer, slow speeds, and low efficiency, nonporous and superficially porous phases have been developed. Specifically, fiber based polymer stationary phases show great promise as stationary phases for protein separations. The Marcus …

Allosteric Regulation Of Bacterial And Fungal Xylulose 5-Phosphate/ Fructose 6-Phosphate Phosphoketolases (Xfps), Katie Glenn

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Acetate is excreted as a metabolic end product in many microbes. Acetate production has primarily been studied in bacteria and archaea but is known to occur in eukaryotic organisms as well. For example, acetate is one of the most abundant metabolites excreted by the fungal pathogen Cryptococcus neoformans during cryptococcosis suggesting that acetate production may be important during pathogenesis. One possible pathway for acetate production in C. neoformans involves the enzymes xylulose 5-phosphate/ fructose 6-phosphate phosphoketolase (Xfp), which can generate acetyl phosphate from either fructose 6-phosphate (F6P) or xylulose 5-phosphate (X5P), and acetate kinase (Ack), which can then convert acetyl …

Biology And Control Of The Bed Bug Cimex Lectularius L., Kevin Hinson

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After vanishing from the public eye for more than 50 years, bed bugs have resurged to become one of the most widely discussed and heavily researched insect pests in the westernized world. Our inability to prevent and successfully treat infestations has been the driving force behind this wave of research. I addressed gaps in our understanding of bed bugs by examining behavioral and life history characteristics, as well as insecticide application responses. I showed that natural-based products are generally ineffective against bed bugs, particularly when used as a residual treatment. I also found that bed bugs may be killed through …

High Frequency Devices And Circuit Modules For Biochemical Microsystems, Jiwei Sun

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This dissertation investigates high frequency devices and circuit modules for biochemical microsystems. These modules are designed towards replacing external bulky laboratory instruments and integrating with biochemical microsystems to generate and analyze signals in frequency and time domain. The first is a charge pump circuit with modified triple well diodes, which is used as an on-chip power supply. The second is an on-chip pulse generation circuit to generate high voltage short pulses. It includes a pulse-forming-line (PFL) based pulse generation circuit, a Marx generator and a Blumlein generator. The third is a six-port circuit based on four quadrature hybrids with 2.0~6.0 …

Thermally Responsive Polymer Electrolytes For Inherently Safe Electrochemical Energy Storage, Jesse Kelly

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Electrochemical double layer capacitors (EDLCs), supercapacitors and Li-ion batteries have emerged as premier candidates to meet the rising demands in energy storage; however, such systems are limited by thermal hazards, thermal runaway, fires and explosions, all of which become increasingly more dangerous in large-format devices. To prevent such scenarios, thermally-responsive polymer electrolytes (RPEs) that alter properties in electrochemical energy storage devices were designed and tested. These RPEs will be used to limit or halt device operation when temperatures increase beyond a predetermined threshold, therefore limiting further heating. The development of these responsive systems will offer an inherent safety mechanism in …

A Comprehensive Assessment Methodology Based On Life Cycle Analysis For On-Board Photovoltaic Solar Modules In Vehicles, Mahmoud Abdelhamid

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This dissertation presents a novel comprehensive assessment methodology for using on-board photovoltaic (PV) solar technologies in vehicle applications. A well-to-wheels life cycle analysis based on a unique energy, greenhouse gas (GHG) emission, and economic perspective is carried out in the context of meeting corporate average fuel economy (CAFE) standards through 2025 along with providing an alternative energy path for the purpose of sustainable transportation. The study includes 14 different vehicles, 3 different travel patterns, in 12 U.S. states and 16 nations using 19 different cost analysis scenarios for determining the challenges and benefits of using on-board photovoltaic (PV) solar technologies …

Elastically Mismatched Interfaces As Related To Glass-To-Metal Seals, William Horton

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The mechanical performance of Glass-to-Metal seals is largely dependent upon the morphology of the oxide interfaces. The interfaces of the glass-to-metal region are transition zones consisting of a metallically bonded base metal with its reduced oxide and progress to interatomic bonds which are a mixture of ionic and covalent in a glass or ceramic base material. Differences in coefficient of thermal expansion, interatomic bonding and overall physical chemistry cause a number of issues in design, manufacture and lifetime serviceability of a G/M seal. To date the primary dimensions of interface assessment are microscopy and analytical chemistry. The purpose of this …

Development Of An In Vitro Three-Dimensional Breast Tissue Model To Decipher The Effects Of Stromal Heterogeneity On Normal And Cancerous Mammary Epithelial Cells, Erin Mccave

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A goal of breast cancer research is to develop a detailed understanding of the underlying mechanisms of disease progression and to generate approaches to improve early detection, monitoring, and treatment of breast cancerous lesions. Current breast cancer therapies are not successful for all cases as they were developed as a standard of care for 'average' breast cancer condition. To further current clinical success, the characteristics of each tumor mass must be considered. Such an individualized or personalized approach is incompatible with current understanding of 'average' breast cancer tumors and responses to treatments. The long-term objective of the present research is …

Phylogenomics And Historical Biogeography Of The Gooseneck Barnacle Pollicipes Elegans, Sergio Andres Marchant Rojas

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This dissertation explores the systematics, biogeography, and genomics of the gooseneck barnacle Pollicipes elegans, a marine crustacean of the tropical Eastern Pacific. In Chapter 1, I provide a broad framework for my research by introducing and focusing on the long-­‐standing debate of the mechanisms behind the latitudinal gradient in species diversity, which provided the initial motivation for using Pollicipes elegans as a model system to study the mechanisms leading to genetic differentiation and speciation in tropical regions. In Chapter 2, I examine the genetic structure, infer patterns of connectivity across the warm tropical waters of the eastern Pacific, and reconstruct …

The Bg News December 01, 2014, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. December 01, 2014. Volume 94-Issue 42.

Development Of A Transport System For Advancing Tissue Engineering And Cell Identification, Suzanne Mae Tabbaa

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This work centers on the development of a novel passive transport system for two tissue engineering applications – cell distribution and cell separation. This approach relies on a wicking fiber-based system, derived from the textile field that functions by directing and maintaining transport of cells as well as fluids and biomolecules. This system has the ability to enhance cell movement for both the purpose of cell seeding distribution as well as to isolate specific cell types from heterogeneous cell populations.

The success of spinal fusions and large bone defects is often limited by the decreased surrounding vasculature and the ability …

Investigation Of Electrical Component Failures Affecting Vehicle Electronics, Dexin Zhang

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This dissertation describes three independent studies related to electrical component failures affecting vehicle electronics. The topics covered are: comparison of the accelerator-pedal-to-engine-control module (AP-to-ECM), the effect of electrical fast transients on multi-layer ceramic (MLC) capacitors, and electrical behavior of MLC capacitors damaged by electrostatic discharge.

The first chapter examines the AP-to-ECM interfaces of five vehicles equipped with electronic throttle control systems. All five vehicles employ simple voltage level sensing from two or three sensors in the accelerator pedal assembly. The purpose of the study is to identify any differences in the AP-to-ECM interfaces of vehicles with high reported rates of …

Fault Tolerance In Distributed Systems Using Self-Stabilization, Yihua Ding

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Self-stabilization is an optimistic paradigm to provide autonomous resilience against an un-limited number of transient faults in distributed systems. A self-stabilizing system guarantees an eventual return to a legitimate operating state beginning with an unknown initial state, including a state that arises as the result of an unanticipated transient fault (e.g., node failure, state corruption, or node mobility in mobile systems). This thesis focuses on the fault tolerance in distributed sys-tems using self-stabilization, and presents a collection of self-stabilizing algorithms for well-known problems in distributed systems.

Two variants of dominating set (i.e., weakly connected dominating set and positive influence dominating …