Arts and Humanities Commons^™

Resonance Ultrasonic Vibrations And Photoluminescence Mapping For Crack Detection In Crystalline Silicon Wafers And Solar Cells, Andrii Monastyrskyi

USF Tampa Graduate Theses and Dissertations

The solar energy, or photovoltaic (PV) industry, driven by economic competition with traditional fossil energy sources, strives to produce solar panels of the highest conversion efficiency and best reliability at the lowest production cost. Solar cells based on crystalline silicon are currently the dominant commercial PV technology by a large margin, and they are likely to remain dominant for at least one decade. The problem of improvement mechanical stability of silicon wafers and finished solar cell is one of the most critical for entire PV industry. Mechanical defects in wafer and cells in the form of periphery or internal cracks …

Two Essays On Financial Condition Of Firms, Sanjay Kudrimoti

USF Tampa Graduate Theses and Dissertations

This dissertation includes two related chapters that analyze financial condition of firms. In the first chapter, I examine the relationship between the firms' level of cash holdings and governance. The findings show that higher levels of cash holdings are significantly related to strong governance. The results also show that firms with strong governance hold asymmetrically higher levels of cash than firms with weak governance when they have high growth opportunities. Furthermore, I also test the impact of financial constraint status of the firm on the level of cash holdings for both good and poorly governed firms separately. The results suggest …

The Class Of ’65: Boomers At Sixty Recall Turning Points That Shaped Their Lives A Narrative Approach, Mary C. Poole

USF Tampa Graduate Theses and Dissertations

This dissertation explores the lives of baby boomers turning sixty as they use narrative to review their past by focusing on turning points. They reflect upon their present, and anticipate their future. The story begins at the St. Pius X High School Class of 1965's fortieth reunion, and proceeds to a class sixtieth birthday celebration and focus group. In addition, five members of the class record their life stories retrospectively. This research explores issues of identity, both personal and generational; the social construction of aging; grief, loss and death; and resilience, meaning, and spirituality. Methods used are autoethnography, narrative, participant …

A Molecular-Dynamics Study Of The Frictional Anisotropy On The 2-Fold Surface Of A D-Alnico Quasicrystalline Approximant, Heather Mcrae Harper

USF Tampa Graduate Theses and Dissertations

In 2005, Park et al. demonstrated that the 2-fold surface of a d-AlNiCo quasicrystal exhibits an 8-fold frictional anisotropy, as measured by atomic-force microscopy, between the periodic and aperiodic directions [40, 41]. It has been well known that quasicrystals exhibit lower friction than their crystalline counterparts [38, 18, 51, 30, 12, 54]; however, the discovery of the frictional anisotropy allows for a unique opportunity to study the effect of periodicity on friction when chemical composition, oxidation, and wear are no longer variables.

The work presented herein is focused on obtaining an understanding of the mechanisms of friction and the …

Three-Dimensional Microscopy By Laser Scanning And Multi-Wavelength Digital Holography, Alexander Khmaladze

USF Tampa Graduate Theses and Dissertations

This dissertation presents techniques of three-dimensional microscopy. First, an economical method of microscopic image formation that employs a raster-scanning laser beam focused on a sample, while non-imaging detector receives the scattered light is presented. The images produced by this method are analogous to the scanning electron microscopy with visible effects of shadowing and reflection. Compared to a conventional wide-field imaging system, the system allows for a greater flexibility, as the variety of optical detectors, such as PMT and position-sensitive quadrant photodiode can be used to acquire images. The system demonstrates a simple, low-cost method of achieving the resolution on the …

The Relationship Between Childhood And Adolescent Family Environment And Adult Psychological Functioning In Females Who Experienced Childhood Sexual Abuse, Ross Krawczyk

USF Tampa Graduate Theses and Dissertations

Research has shown childhood sexual abuse (CSA) to be related to many negative outcomes in adulthood including psychopathology. Findings in this area, however, are very inconsistent, with the relationship between CSA and adult outcomes varying greatly across studies. This relationship is further complicated by the co-occurrence with CSA of other risk factors in childhood. The present study examines the prediction of adult psychopathology, measured by the Brief Symptom Inventory (BSI; Derogatis, 1982), made by CSA, measured by the Early Sexual Experiences Survey (ESE; Bartoi & Kinder, 1998), childhood SES (Hollingshead, 1975), parental bonding, as measured by the Parental Bonding Instrument …

Dynamic Assessment: Towards A Model Of Dialogic Engagement, Robert Summers

USF Tampa Graduate Theses and Dissertations

This study investigated the effects of Dynamic Assessment (DA) training on the mediational strategies of experienced teachers of French as a foreign language. Moreover the strategies that mediators used for students at different levels of language experience were investigated. Last the ways in which mediators manifested mediational sensitivity, reciprocity and management was examined.

Four mediators underwent DA training that exposed them to the theoretical underpinnings of DA as well as sound DA procedures. To determine the effect of this training, the way in which the mediators conducted their mediation was compared from pre-DA training to post-DA training. Three of these …

Spray Deposition Of Biomolecular Thin Films, Mihir K. Rayan

USF Tampa Graduate Theses and Dissertations

In this paper, a parametric study of the airbrush deposition technique was investigated for the deposition biomolecular thin films. The airbrush parameters under investigation were intake valve opening, carrier gas pressure, distance between the airbrush and substrate, concentration of solution, vapor pressure of solvent, and hydrophobic/hydrophilic substrate surface. This study was assessed through the characterization of dried droplet residues of Bovine Serum Albumin (BSA) and of complete films of BSA by means of scanning electron microscopy (SEM) and atomic force microscopy (AFM). It was determined that droplet size was mainly affected by carrier gas pressure and vapor pressure. The parameters …

Statistical Profile Generation Of Real-Time Uav-Based Traffic Data, Anuj Puri

USF Tampa Graduate Theses and Dissertations

Small unmanned vehicles are used to provide the eye-in-the-sky alternative to monitoring and regulating traffic dynamically. Spatial-temporal visual data are collected in real-time and they are used to generate traffic-related statistical profiles, serving as inputs to traffic simulation models. Generated profiles, which are continuously updated, are used to calibrate traffic model parameters, to obtain more accurate and reliable simulation models, and for model modifications. This method overcomes limitations of existing traffic simulation models, which suffer from outdated data, poorly calibrated parameters, questionable accuracy and poor predictions of traffic patterns.

A Longitudinal Study: The Impact Of A Comprehensive Emergency Management System On Disaster Response In The Commonwealth Of The Bahamas, Erin P. Hughey

USF Tampa Graduate Theses and Dissertations

Global trends show increasing losses from disasters as the number of people at risk grows by 70 to 80 million per year (United Nations, 2004). Although the frequency of natural disasters may be constant the human interaction with the given hazard has shifted through changes in development practices, environmental protection as well as the distribution of population and wealth. In an effort to combat the negative social, economic, and environmental impacts of hazards, strategies for identifying vulnerable populations and implementing mitigation measures is a high priority in hazards research. However despite our best efforts disasters have and will continue to …

Control Of Autonomous Robot Teams In Industrial Applications, Athanasios Tsalatsanis

USF Tampa Graduate Theses and Dissertations

The use of teams of coordinated mobile robots in industrial settings such as underground mining, toxic waste cleanup and material storage and handling, is a viable and reliable approach to solving such problems that require or involve automation. In this thesis, abilities a team of mobile robots should demonstrate in order to successfully perform a mission in industrial settings are identified as a set of functional components. These components are related to navigation and obstacle avoidance, localization, task achieving behaviors and mission planning. The thesis focuses on designing and developing functional components applicable to diverse missions involving teams of mobile …

Regulation Of Bax Activation And Apoptosis By Src And Acetylated Mutant P53, Nicholas Taylor Woods

USF Tampa Graduate Theses and Dissertations

Apoptosis is an inherent suicide mechanism that cells invoke for a variety of reasons including embryo cavitation, tissue homeostasis, excessive DNA damage and aberrant oncogene activation. Apoptosis is regulated by a diverse set of proteins including, but not limited to, the Bcl-2 family. This family set is comprised of both pro-death and pro-survival proteins whose relative expression, localization and/or modifications regulate the balance between life and death for each cell. The keystones to this system are the proapoptotic proteins Bax and Bak, which are regulated by their conformation and localization. However, the exact mechanisms by which Bax and Bak become …

Relationship Of Anger Trait And Anger Expression To C-Reactive Protein In Post-Menopausal Women, Rosalyn Gross

USF Tampa Graduate Theses and Dissertations

Coronary heart disease is the leading cause of death in American women, accounting for one in six deaths in 2004. One third of women over the age of forty will develop coronary heart disease in their lifetime. The role of chronic and excessive inflammation and risk factors, such as smoking and high cholesterol, are now well-established factors contributing to coronary heart disease pathology. A knowledge gap exists in that little is known about the mechanisms by which psychosocial factors, such as anger, may be associated with pro-inflammatory processes that contribute to cardiovascular morbidity and mortality in women. The purpose of …

The Effect Of Hydrogen On The Optical, Structural Properties And The Crystallization Of Gete2 Thin Films Prepared By Rf Magnetron Sputtering, Ke Cao

USF Tampa Graduate Theses and Dissertations

Thin films of GeTe₂ were deposited on glass substrates using RF magnetron sputtering with various hydrogen flow rates in the growth chamber. Transmission data of deposited films were taken and used to determine optical constants: refractive index (n), extinction coefficient (κ), and absorption coefficient (α)) and the energies: E₀₄, E₀₃, Tauc band gap E[subscript]Tauc and Urbach energy E[subscript]U. An increase of these energies was observed with increasing hydrogen flow rate. This increase is interpreted on the basis of the density of state model proposed by Mott and Davis. An increase of network disorder due to the inclusion of hydrogen into …

Flavonoids As Modulators Of Amyloid Precursor Protein Metabolism And Alzheimer Disease Pathology, Kavon Rezai-Zadeh

USF Tampa Graduate Theses and Dissertations

Alzheimer disease (AD) is a progressive neurodegenerative disorder pathologically characterized by deposition of ß-amyloid (Aß) peptides as plaques in the brain. Central to this AD pathology is mismetabolism of the amyloid precursor protein (APP). Recent studies suggest that flavonoids, a class of secondary plant metabolites, may be useful for the prevention and treatment of a variety of neurodegenerative diseases. The studies detailed herein, investigate the ability of two such classes of flavonoids, green tea derived catechins and 5,7-dihydroxyflavones, to modulate APP metabolism in "Swedish" mutant APP (APP_sw) models of AD. Studies showed that green tea derived (-)-epigallocatechin-3-gallate (EGCG) …

Quantitative Phase Imaging Microscopy With Multi-Wavelength Optical Phase Unwrapping, Nilanthi Warnasooriya

USF Tampa Graduate Theses and Dissertations

This dissertation presents a quantitative phase imaging microscopy technique that combines phase-shifting interferometry with multi-wavelength optical phase unwrapping. The technique consists of a Michelson-type interferometer illuminated with any of three types of light sources; light emitting diodes, laser diodes and a ring dye laser. Interference images are obtained by using a 4-frame phase shifting method, and are combined to calculate the phase of the object surface. The 2π ambiguities are removed by repeating the experiment combining two and three different wavelengths, which yields phase images of effective wavelength much longer than the original. The resulting image is a profile of …

Evaluating The Efficacy Of The Developing Algebraic Literacy Model: Preparing Special Educators To Implement Effective Mathematics Practices, Sharon N. E. Ray

USF Tampa Graduate Theses and Dissertations

For students with learning disabilities, positive academic achievement outcomes are a chief area of concern for educators across the country. This achievement emphasis has become particularly important over the last several years because of the No Child Left Behind legislation. The content area of mathematics, especially in the higher order thinking arena of algebra, has been of particular concern for student progress. While most educational research in algebra has been targeted towards remedial efforts at the high school level, early intervention in the foundational skills of algebraic thinking at the elementary level needs consideration for students who would benefit from …

Three Wittgensteins: Interpreting The Tractatus Logico-Philosophicus, Thomas J. Brommage Jr.

USF Tampa Graduate Theses and Dissertations

There are historically three main trends in understanding Wittgenstein's Tractatus. The first is the interpretation offered by the Vienna Circle. They read Wittgenstein as arguing that neither metaphysical nor normative propositions have any cognitive meaning, and thus are to be considered nonsense. This interpretation understands Wittgenstein as setting the limits of sense, and prescribing that nothing of substantive philosophical importance lies beyond that line. The second way of reading the Tractatus, which has became popular since the 1950s, is the interpretation which most currently accept as the early Wittgenstein's view; for this reason I refer to it …

Minding The Gap: What It Is To Pay Attention Following The Collapse Of The Subject-Object Distinction, S West Gurley

USF Tampa Graduate Theses and Dissertations

Contemporary studies of the phenomenon of attention uncritically suppose that the only way to go about observing attention is as a modification of consciousness. Consciousness is taken to be always intentional, i.e., distinguished by reference to an object-whether physical or not-toward which it is directed. Observers of attention therefore assume that attention is an intentional modification of consciousness. Such practices of observation, in virtue of the kinds of practices that they are, take for granted that the fundamental constituents of reality are subjects and objects. Edmund Husserl and Martin Heidegger (and Maurice Merleau-Ponty after them) discovered that belief in the …

Resiliency In Academically Successful Latina Doctoral Students: Implications For Advocacy, Katherine M. Fuerth

USF Tampa Graduate Theses and Dissertations

Research indicates that the Latina/o population is growing in the United States, and more Latina/os are attending college, many do not continue their education beyond the undergraduate level, much less beyond the Master's level. Latinas in particular continue to be underrepresented in professional roles due to the small number of Latinas who obtain doctoral degrees. Although many Latinas do not continue their education or drop-out throughout their graduate schooling, some Latinas do thrive forward and are academically successful. This study aimed at identifying elements that fostered resiliency in academically successful Latina doctoral students, as well as identifying challenges or barriers …

Luminex Microsphere Immunoassay Offers An Improved Method In Testing For Antibodies To Eastern Equine Encephalitis Virus In Sentinel Chicken Sera, Kelly Ann Fitzpatrick

USF Tampa Graduate Theses and Dissertations

Eastern Equine Encephalitis virus has a human mortality rate of 30% of those cases diagnosed, while 30% of those surviving infection remain with neurological sequelae for life (CDC.gov, 2007).

The use of sentinel chickens for surveillance of arboviruses that are known to use birds as a reservoir host, such as St. Louis Encephalitis (SLE), West Nile (WN) virus, Eastern Equine Encephalitis (EEE) and Highlands J (HJ) virus, in Florida began with the Sentinel Chicken Arboviral Surveillance Network in 1978 (Day and Stark, 1996). This network enables the activation of an early warning system for citizens, as well as, county epidemiologists …

Multilocus Virulence Typing Of Clinical And Environmental Vibrio Vulnificus Isolates, Katrina V. Gordon

USF Tampa Graduate Theses and Dissertations

The bacterium Vibrio vulnificus is an autochthonous inhabitant of estuarine waters and also found in shellfish such as oysters. It is a human pathogen of importance in the seafood industry, and can also infect recreational water users. Currently, recognized methods of detection rely upon isolation of pure cultures which requires at least 24 hours. To reduce the time needed for identification of the pathogen and simultaneously ascertain the virulence potential of the strains present, real-time PCR assays and sample processing procedures were developed (Chapter 1). These assays discriminate between type A (environmental, generally lower virulence) and type B (clinical, higher …

Regards Sur L’Être Et Le Paraitre Dans Trois Portraits Du Xviie Siècle, Martine J. Landis

USF Tampa Graduate Theses and Dissertations

Introduced in French Salons as a parlor game, the literary portrait appears in mid Seventeenth-Century. It is similar to the literary portraits inserted in Roman à clé but it does not hide the identity of the subject behind a pseudonym, it depicts the individual as is. In a self-portrait subjects look at, observe, evaluate then describe themselves. They offer themselves to the gaze of others and propose a true reading of what they are. The self-portrait attempts to harmonize the appearance and the inner being, to render visible the essence of the person. However, in the Seventeenth Century, people reinvent …

Factors Affecting Message Intelligibility Of Cued Speech Transliterators, Katherine Pelley

USF Tampa Graduate Theses and Dissertations

While a majority of deaf students mainstreamed in public schools rely on interpreters, little research has investigated interpreter skills and no research to date has focused on interpreter intelligibility (Kluwin & Stewart, 2001). This thesis is the second in a series of experiments designed to quantify the contribution of various factors affecting the intelligibility of interpreters (transliterators) who use English-based communication modes. In the first experiment, 12 Cued Speech transliterators were asked to transliterate an audio lecture. Two aspects of these transliterated performances were then analyzed: 1) accuracy, as measured as the percent-correct cues produced, and 2) lag time, the …

Active And Passive Microwave Radiometry For Transcutaneous Measurements Of Temperature And Oxygen Saturation, Thomas A. Ricard

USF Tampa Graduate Theses and Dissertations

In this work we explore two novel uses of microwave technology in biomedical applications. Introductory material on the electrical properties of biological tissues is presented to form the groundwork for the basic theory behind both techniques.

First, we develop a technique that uses 60 GHz signals to detect changes in blood oxidation levels. Several atmospheric propagation models are adapted to predict oxygen resonance spectra near this frequency. We are able to predict and observe the changes in these levels as the blood ages up to 48 hours. Identical testing procedures performed using arterial blood gas (ABG) calibration samples with controlled …

The Acceptability Of Treatments For Adolescent Depression To A Multi-Ethnic Sample Of Girls, Nicole Caporino

USF Tampa Graduate Theses and Dissertations

An efficacious treatment is diminished in value if clients will not seek it out and adhere to it (Kazdin, 1978). Thus, the acceptability of a treatment to consumers is an important indicator of the quality/effectiveness of the treatment (APA, 2002). The purpose of this study was to examine acceptability of treatments for depression to adolescent females and to explore factors that might be associated with acceptability. Sixty-seven high school students (36 Hispanic and 31 non-Hispanic White) were recruited from communities in New Jersey and Florida, and interviewed by telephone. Participants were presented with a vignette describing a depressed adolescent and …

Fate Of Volatile Chemicals During Accretion On Wet-Growing Hail, Ryan A. Michael

USF Tampa Graduate Theses and Dissertations

Phase partitioning during freezing of hydrometeors affects the transport and distribution of volatile chemical species in convective clouds. Here, the development, evaluation, and application of a mechanistic model for the study and prediction of partitioning of volatile chemical during steady-state hailstone growth are discussed. The model estimates the fraction of a chemical species retained in a two-phase growing hailstone. It is based upon mass rate balances over water and solute for constant accretion under wet-growth conditions. Expressions for the calculation of model components, including the rates of super-cooled drop collection, shedding, evaporation, and hail growth were developed and implemented based …

Performance And Perception: An Experimental Investigation Of The Impact Of Continuous Reporting And Continuous Assurance On Individual Investors, Anita Reed

USF Tampa Graduate Theses and Dissertations

This study was designed to examine the impact of different levels of reporting frequency (periodic versus continuous) of financial information, both with and without assurance, on individual investors in a stock price prediction task. Reporting was manipulated at two levels: periodic and continuous. Assurance was manipulated at two levels: no assurance and with assurance. In addition, a base level condition was included. The experiment was designed to collect data regarding both the investors' performance and their perceptions. Period one of the experiment consisted of the base level condition for all participants. Independent variable manipulation was implemented in period two, using …

Benzene Related Hematological Disorders: Evidence For A Threshold In Animals And Humans, James Mccluskey

USF Tampa Graduate Theses and Dissertations

Significant benzene exposure has historically been associated with the development of a host of hematological disorders in humans and animals. In particular, benzene is known to cause disturbances of the peripheral blood, aplastic anemia and cancer of the lymphohematopoietic system. In 1928, the first modern report of an association between cancer and benzene exposure was published. This case report was followed by additional reports from around the world. In most instances, ailments resulted from long term, high level exposure to benzene found in glues, and through accidental industrial spills. Throughout the 1960's and 1970's, case reports accumulated linking benzene exposure …

Stable Carbon Isotope Discrimination By Form Ic Rubisco From Rhodobacter Sphaeroides, Phaedra Thomas

USF Tampa Graduate Theses and Dissertations

Variations in the relative amounts of ¹²C and ¹³C in microbial biomass can be used to infer the pathway(s) autotrophs use to fix and assimilate dissolved inorganic carbon. Discrimination against ¹³C by the enzymes catalyzing autotrophic carbon fixation is a major factor dictating the stable carbon isotopic composition (δ¹³C = {[¹³C/¹²C_sample/¹³C/¹²C_standard] - 1} X 1000) of biomass. Six different forms of ribulose 1,5-bisphosphate carboxylase/oxygenase or RubisCO (IA, IB, IC, ID, II, and III), the carboxylase of the Calvin-Benson-Bassham cycle (CBB), are utilized by algae and autotrophic bacteria that rely on the CBB cycle for carbon fixation. …