Digital Commons Network^™

Experimental Investigation Of Encapsulated Phase Change Materials For Thermal Energy Storage, Tanvir E. Alam

USF Tampa Graduate Theses and Dissertations

Thermal energy storage (TES) is one of the most attractive and cost effective solutions to the intermittent generation systems like solar, wind and other renewable sources, compared to alternatives. It creates a bridge between the power supply and demand during peak hours or at times of emergency to ensure the continuous supply of energy. Among all the TES systems, latent heat thermal energy storage (LHTES) draws lots of interests as it has high energy density and can store or retrieve energy isothermally. Two major technical challenges associated with the LHTES are low thermal conductivity of the phase change materials (PCMs), …

Sound Attenuation Performance Of Fiber-Reinforced Polymer Composite Circumaural Hearing Protection Devices, Steven Christopher Augustine

USF Tampa Graduate Theses and Dissertations

Personnel who work on the flight deck of an aircraft carrier are exposed to extreme levels of jet engine noise often in excess of 140 decibels (dB). The current circumaural hearing protective devices (CAHPD) employed by flight deck crewmen are inadequate for the level of protection required for these extreme levels of noise. Fiber-reinforced thermoset polymer composite (FRPC) materials such as aramid fibers used in body armor, have high theoretical values of acoustic impedance due to a fundamentally high modulus of elasticity and may offer a superior level of hearing protection over original equipment (OE) thermoplastic CAHPDs. The objective of …

Sigma Receptor Activation Mitigates Toxicity Evoked By The Convergence Of Ischemia, Acidosis And Amyloid-Beta, Adam Alexander Behensky

USF Tampa Graduate Theses and Dissertations

Stroke is the fifth leading cause of death in the United States and a major cause of long-term disability in industrialized countries. The core region of an ischemic stroke dies within minutes due to activation of necrotic pathways. Outside of this core region is the penumbral zone, where some perfusion is maintained via collateral arteries. Delayed cell death occurs in this area due to the triggering of apoptotic mechanisms, which expands the ischemic injury over time. The cellular and molecular events that produce the expansion of the ischemic core continue to be poorly understood. The increases in the amyloid precursor …

Regulation And Targeting Of The Fancd2 Activation In Dna Repair, Valentina Celeste Caceres

USF Tampa Graduate Theses and Dissertations

Fanconi anemia (FA) is a genome instability syndrome that is clinically manifested by bone marrow failure, congenital defects, and elevated cancer susceptibility. The FA pathway is known to regulate the repair of DNA interstrand crosslinks in part through DNA homologous recombination (HR) repair. Up to today 16 FA proteins have been discovered that may participate in the common pathway. Cells that have mutations in the FA genes are hypersensitive to DNA damaging agents and display chromosome instability. A key regulatory event in the FA pathway is monoubiquitination of FANCD2-FANCI heterodimer that is mediated by a multi-component E3 ubiquitin ligase complex …

Communication Of Lava Flow Hazards At The San Francisco Volcanic Field, Flagstaff, Arizona, Catherine St. John Carter

USF Tampa Graduate Theses and Dissertations

This thesis examines different methods of communicating volcanic hazards to the population of Flagstaff, Arizona using the results of a recent lava flow hazard assessment of the nearby San Francisco Volcanic Field (SFVF). Harburger (2014) determined that given a lava flow originating in the SFVF, there is a statistical probability that it will inundate the city of Flagstaff or even originate from a vent within the city limits. Based on the recurrence rates for the most recent eruptions (3 x 10-4/year), the probability of lava flow inundation in Flagstaff is 1.1 x 10-5 per year.

This study considers the effects …

Laboratory Evaluation Of Organic Soil Mixing, Spencer Dean Baker

USF Tampa Graduate Theses and Dissertations

Organic soils present a difficult challenge for roadway designers and construction due to the high compressibility of the soil structure, the often associated high water table, and the high moisture content. For other soft or loose soils (inorganic soils), stabilization via cement or similar binders (a method called soil mixing) has proven to be an effective solution. To this end, the Federal Highway Administration has published a comprehensive design manual for these techniques. Organic soils, however, are not addressed therein to a level of confidence for design, as organic soils do not follow the trends of inorganic soils. This has …

Two Essays On Ipos And Asset Prices, Gaole Chen

USF Tampa Graduate Theses and Dissertations

In the first essay we examine the effect of concurrent lending and underwriting on IPO withdrawal, we find that IPOs underwritten by the firms’ concurrent lending banks are significantly more likely to be withdrawn. The result is robust to controlling for the common factors that affect IPO withdrawal and also for endogeneity using a propensity score matching portfolio. Our evidence suggests a cost to IPO firms’ hiring concurrent lending banks as underwriters despite the potential benefit of informational scope economies such intermediaries may provide. It is consistent with an alternative argument that a current lending and underwriting bank has less …

An Experimental Evaluation Of The Relationship Between In-Vivo Stimuli And Attentional Bias To Smoking And Food Cues Among Female Smokers, John Bernard Correa

USF Tampa Graduate Theses and Dissertations

Background: Cross-sectional and experimental research has shown that female smokers more frequently report using cigarettes to control negative affect, manage dietary restraint, and suppress body image dissatisfaction. However, there has been little research to identify cognitive mechanisms that may underlie these effects. Cross-stimulus attentional bias is one such mechanism.

Aims and Hypotheses: We hypothesized that, when compared to neutral stimuli, in-vivo appetitive stimuli would enhance motivation to obtain a particular substance. More specifically, in-vivo smoking stimuli would increase attentional bias to smoking-related pictorial cues, whereas in-vivo food stimuli would increase attention to smoking-related and food-related pictorial cues. We also hypothesized …

Vulnerability Of Larval Fish Populations To Oil Well Blowouts In The Northern Gulf Of Mexico, Emily Chancellor

USF Tampa Graduate Theses and Dissertations

On April 20th, 2010, a fire broke out on the Deepwater Horizon (DWH) offshore oil drilling rig on the Macondo prospect located off the coast of the Gulf of Mexico (GOM). This fire and resulting explosions resulted in the sinking of the Deepwater Horizon rig and the largest marine oil spill in history. An estimated 4.9 million (+/- 10%) barrels were released into the Gulf of Mexico over the ensuing 87 days. Many economically important fish species spawn in northern Gulf of Mexico waters; the spawning seasons and pelagic larval phase of many of these species occur within the temporal …

Wrestling With Angels: Postsecular Contemporary American Poetry, Paul T. Corrigan

USF Tampa Graduate Theses and Dissertations

In the current “secular age,” more and more people find beliefs and behaviors associated with traditional religion intellectually and ethically untenable. At the same time, many “postsecular” writers, both believers and nonbelievers, continue to write with religious or religiously-inflected forms, themes, and purposes. In the United States, postsecular poets “wrestle with angels” by engaging constructively and deconstructively with matters traditionally considered the domain of religion and spirituality. While the recent work of Jürgen Habermas, Charles Taylor, John McClure and others puts the concept of the postsecular at the cutting edge of various fields of study, including religion, sociology, and literature, …

A Semiotic Phenomenology Of Homelessness And The Precarious Community: A Matter Of Boundary, Heather Renee Curry

USF Tampa Graduate Theses and Dissertations

My dissertation focuses on the articulation of the concepts of precarity —i.e., temporary, affective, creative, immaterial and insecure labor—and community in an overheating system. My site of inquiry is homelessness broadly, but more specifically the labor of panhandling and the identity of “the panhandler.” I recognize that primary theorizations of precarity have located it as a problem of labor and economy. Others have looked at it from the sociological domain. My work looks at precarity as diffuse across social, political, and communal systems, but primarily as an effect of the problem of overheating as it manifests at varying levels of …

Examining Endorsement And Viewership Effects On The Source Credibility Of Youtubers, Stephanie Fred

USF Tampa Graduate Theses and Dissertations

The growth of YouTube has resulted in the industrialization of a platform that redefines mainstream success. Success measures such as endorsements and viewership are serving as motivational factors for YouTubers. YouTubers and brands want more views, but are those motivations effecting perception? While much research has focused on the effects that YouTube has on the brand, this study focuses on the effects that the brand has on the YouTuber. It also determines whether viewership affects YouTuber perception and whether it‟s a success measure worth using. Using the constructs of the source credibility theory, this study assessed the main effect of …

Maternal Stress, Breastmilk Igf-1, And Offspring Growth Among Breastfeeding Mothers-Infant Pairs In The Tampa Bay Area, Lauren Michelle Gottfredson

USF Tampa Graduate Theses and Dissertations

Background: Maternal stress during utero has been shown to have negative health consequences on the offspring, including low birth weight and increased risk of adult disease. Variation in breastmilk may act as an environmental cue of maternal stress and continue to program the infant during early life. This research aimed to explore the role of breastmilk on developmental programming of the infant. Specifically, to examine how breastmilk may act as a medium for the exposure of stress between the mother and the offspring, and see if variation in insulin like growth factor-1 (IGF-1) a potential mechanism for the relationship.

Methods: …

Mindfulness Attributes As Predictors Of Treatment Outcomes In Children Who Stutter, Jenna Lee Graepel

USF Tampa Graduate Theses and Dissertations

A recent U.S.-based survey (Boyle et al,. 2011) estimated stuttering prevalence in American children ages 3-17 years at 1.6% or 1 in 63 children. In comparison to the reported 1 in 68 school age children living with Autism Spectrum Disorder (Centers for Disease Control and Prevention, 2010), stuttering affects nearly as many. These estimates suggest that Speech-Language Pathologist (SLPs) should increasingly develop their skill sets for identifying and providing interventions for children who stutter.

The evidence base for school-age fluency intervention, while promising, leaves much room for further development (Nippold, 2011). The majority of current interventions revolve around the traditional …

Theoretically Guided Examination Of Caregiver Strain And Its Relationship With School-Based Mental Health Services Utilization And Parent Engagement In Services, Amy Lynn Green

USF Tampa Graduate Theses and Dissertations

Broadly, the purpose of this study was to address the gaps in the knowledge base of caregiver strain through an examination of this and other theoretically related constructs in a sample of parents of high-risk youth. In the last two decades, a growing body of research has pointed to the significance of strain that can result from this caregiving experience, particularly as it relates to patterns of mental health services utilization. Despite the fact that the majority of children who receive mental health receive them from the school, few studies have examined caregiver strain in the context of school-based mental …

Neuroinflammatory Alterations Via Cd-36 In Traumatic Brain Injury, Diana G. Hernandez-Ontiveros

USF Tampa Graduate Theses and Dissertations

Traumatic brain injury (TBI) has become an increasingly unmet clinical need due to intense military conflicts worldwide. Directly impacted brain cells suffer massive death, with neighboring cells succumbing to progressive neurodegeneration accompanied by inflammatory and other secondary cell death events. Subsequent neurodegenerative events may extend to normal areas beyond the core of injury, thereby exacerbating the central nervous system’s inflammatory response to TBI. Recently CD-36 (cluster of differentiation 36/fatty acid translocase (FAT), a class B scavenger receptor of modified low-density lipoproteins (mLDLs) in macrophages, has been implicated in lipid metabolism, atherosclerosis, oxidative stress, and tissue injury in cerebral ischemia, and …

Situating Contraceptive Practices And Public Health Strategy In The Bronx: Perspectives From Female Youth, Healthcare Workers, And Reproductive Health Leaders, Hannah Louise Helmy

USF Tampa Graduate Theses and Dissertations

In the United States, concerns about adolescent childbearing and its perceived corollaries – negative health outcomes for mother and child, the disintegration of the nuclear family, and “over-dependence” on public resources – began to circulate widely in policy spheres and popular media in the 1970’s, resulting in a proliferation of policies, programs, and services designed to address its prevention. Although national birth rates among adolescents are currently at their lowest since peaking in the early 1990’s, this decline masks persistent and significant disparities between groups of young people by race, ethnicity, geography, and poverty level. The concomitant existence of social …

Use Of Anaerobic Adhesive For Prevailing Torque Locking Feature On Threaded Product, Alan Hernandez

USF Tampa Graduate Theses and Dissertations

The purpose of this research is to determine if anaerobic adhesive can be used as a prevailing torque locking feature. Maintaining preload in critical joints is the usual standard that anaerobic adhesives are held to in aerospace and other industry. To test if anaerobic adhesive can be used as a prevailing torque locking feature a test procedure was developed and implemented to measure the removal torque of threaded fasteners after an allotted cure time. In total, 191 threaded fasteners of different material and coatings were tested in the unseated and seated states with various strengths and varieties of anaerobic adhesive. …

Was It Something They Said? Stand-Up Comedy And Progressive Social Change, David M. Jenkins

USF Tampa Graduate Theses and Dissertations

From our earliest origins in every civilization across the globe, comic performances have fulfilled an important social function. Yet stand-up comedy has not attracted the serious academic inquiry one might expect. This dissertation argues that in the absence of public intellectuals stand-up comics are important to how we talk about and negotiate complicated issues like gender and race. These comic texts are sites of cultural critique, public discourse, tools for articulation, a means of persuasion, and serve to galvanize communities.

This dissertation argues that stand-up comedy performances are a vital part of modern American intellectual and social life and are …

Ucsmp Teachers’ Perspectives When Using Graphing Calculators In Advanced Mathematics, Ilyas Karadeniz

USF Tampa Graduate Theses and Dissertations

Nowadays, technology plays a fundamental role in education, in general, and in mathematics education in particular. The graphing calculator has been an important technological tool in mathematics classrooms since its invention and introduction in 1985 by Casio. As graphing calculators provided so many uses, their contribution to the teaching and learning process has been investigated by many researchers who have shown the use of such technology can have a significant effect on improving mathematics teaching and learning.

Investigating the impact of graphing calculators on student learning is important. It is also essential to research teachers’ perspectives on how using graphing …

Structure-Function Analysis Of The Dna Damage Repair Complex Str In Saccharomyces Cerevisiae, Jessica Ashley Kennedy

USF Tampa Graduate Theses and Dissertations

The RecQ family of helicases has been termed the “Caretakers of the Genome,” and rightfully so. These proteins are highly conserved from bacteria to humans and have been implicated in functions from homologous recombinatorial repair to damage checkpoint response to telomere maintenance and more. Mutant genes of three of the human RecQ helicases lead to syndromes characterized by a high incidence of cancer, premature aging and early death. Despite their implications in several biological functions and importance to the integrity of the human genome and suppression of cancer, many aspects of the RecQ family structure and function remain unknown. To …

Outcomes Of A Combined Mindfulness, Stuttering Modification, And Fluency Shaping Intervention For Children Who Stutter, Jennifer Kordell

USF Tampa Graduate Theses and Dissertations

A week-long intervention for five school-age children who stutter was implemented using techniques of fluency shaping, stuttering management, and mindfulness training. The purpose of this study was to investigate if children who stutter stuttered less frequently, stuttered with less struggle, and demonstrated changes in mindfulness measures after the completion of this week-long intervention. Pre- to post-treatment measures were analyzed by individual and group-level results. A comparative analysis between reading and narrative tasks was also performed. Findings indicate that three out of five children reduced the total number of disfluencies during the reading task, and two children reduced this total during …

Facilitating A Transdisciplinary Approach In Teacher Education Through Multimodal Literacy And Cognitive Neuroscience, Margaret Billings Krause

USF Tampa Graduate Theses and Dissertations

This dissertation is a compilation of research and theoretical papers based on the affordances of multimodal literacies for marginalized learners and for pre-service teachers’ developing conceptualizations of literacy. Through a transdisciplinary lens, the author considers complex issues presented in traditional, print-based learning environments that potentially marginalize learners in their developing abilities to become successful participants in the multiple literacies in the real world.

Three studies focus on pre-service teachers and their developing understanding of effective literacy-related classroom practices. Chapter Three explores potential affordances of a multimodal learning environment for pre-service teachers with self-identified reading difficulties. The phenomenological study highlights differing …

Investigation Of Post-Translational Modifications In Staphylococcus Aureus, Christina Nadia Krute

USF Tampa Graduate Theses and Dissertations

The work presented herein details post-translational modifications (PTMs) in Staphylococcus aureus that are involved in mediating the stress response and normal cellular processes. The first PTM that was investigated is regulated intramembrane proteolysis (RIP) for the activation of the ECF sigma factor σS. We achieved this by analyzing the role of the site-1 protease, which we termed “putative regulator of sigmaS” (PrsS), as it is predicted to be the first enzyme in the RIP cascade, leading to the activation of σS. It was determined that the putative site-1 protease, prsS, mimics transcriptional profiles of sigS; with expression low in all …

The Relationship Between Nurses' Emotional Intelligence And Patient Outcomes, Mary Kutash

USF Tampa Graduate Theses and Dissertations

Heart Failure readmissions (HFR) significantly contribute to all cause hospital readmissions rates. Current evidence on the effectiveness of interventions for reduction of HFR is inconclusive. Recent research suggests that nurses’ emotional intelligence (EI) may be associated with better patient outcomes.

The purpose of this study was to examine if nurses’ EI is significantly related to HFR and if that relationship is mediated through patient satisfaction with care. One hundred and thirty six Registered Nurses were recruited from 11 in-patient units at a large teaching hospital in the south eastern United States. Two surveys were mailed to eligible participants; the Bar-On …

The Meaning Of Stories Without Meaning: A Post-Holocaust Experiment, Tori Chambers Lockler

USF Tampa Graduate Theses and Dissertations

Dissonance exists in efforts to communicate about suffering and despair. Showcasing common societal flawed reactions to despair begs for discourse to create a more communicatively healthy response. Attempting to communicate the suffering of others and feeling like I was failing at that goal led to my own suffering. Using writing as a method of personal healing created an intersection of personal narratives of suffering and victim’s narratives (which can arguable only allow for the co-opting of the story and narcissism). Grappling with the limits of writing to heal provided a lens to see the victim’s narratives in such a way …

A Planar Pseudo-Rigid-Body Model For Cantilevers Experiencing Combined Endpoint Forces And Uniformly Distributed Loads Acting In Parallel, Philip James Logan

USF Tampa Graduate Theses and Dissertations

This dissertation describes the development and effectiveness of a mathematical model used to predict the behavior of cantilever beams whose loading conditions include parallel combinations of evenly distributed loads and endpoint forces. The large deflection of cantilever beams has been widely studied. A number of models and mathematical techniques have been utilized in predicting the endpoint path coordinates and load-deflection relationships of such beams. The Pseudo-Rigid-Body Model (PRBM) is one such method which replaces the elastic beam with rigid links of a parameterized pivot location and torsional spring stiffness. In this paper, the PRBM method is extended to include cases …

Effects Of Solids Retention Time And Feeding Frequency On Performance And Pathogen Fate In Semi-Continuous Mesophilic Anaerobic Digesters, Nathan Daniel Manser

USF Tampa Graduate Theses and Dissertations

Anaerobic digestion is a biochemical process in which organic carbon is biodegraded in an oxygen free environment through a microbial consortium. Engineered biological systems used for resource recovery often utilize anaerobic digestion to treat anthropogenic organic wastes by reclaiming the carbon as energy (methane gas) and a soil amendment (biosolids). Small-scale, or household, semi-continuous anaerobic digesters have been used in developed and developing countries for many decades to produce biogas from human and livestock waste, which is used for heating, lighting, and cooking. This application has been shown to improve the quality of life of the user. Although there is …

Fear Conditioning And Extinction In Childhood Obsessive-Compulsive Disorder, Joseph F. Mcguire

USF Tampa Graduate Theses and Dissertations

Fear conditioning and extinction are central in the cognitive behavioral model of obsessive-compulsive disorder (OCD), which underlies exposure-based cognitive behavioral therapy (CBT). Youth with OCD may have impairments in conditioning and extinction that carries treatment implications. The present study examined these processes using a differential conditioning paradigm. Forty-one youth (19 OCD, 22 community controls) and their parents completed a battery of clinical interviews, rating scales, and a differential conditioning task. Skin conductance response (SCR) served as the primary dependent measure across all three phases of the conditioning procedure (habituation, acquisition, and extinction). During habituation, no meaningful differences were observed between …

Half Empty/Half Full: Absence, Ethnicity, And The Question Of Identity In The United States, Ashley Josephine Martinez

USF Tampa Graduate Theses and Dissertations

This study helps us understand the complexities of transnational abandonment, and transnational abandonment in the context of Saudi heritage in particular. Based on a textual analysis of narratives on a blog by individuals abandoned by their Saudi fathers, my findings suggest that they discursively construct their identity in three ways: a) by negotiating their illegitimate status as perceived by many Saudis, and the validity of their search; b) by making sense of the absence of father and the cultural knowledge of the paternal side, while negotiating the inevitable presence of the father in many other ways and their ethnic difference; …