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Evolution And Functional Morphology Of The Cephalic Lobes In Batoids, Samantha Lynn Mulvany

USF Tampa Graduate Theses and Dissertations

Cephalic lobes are unique structures derived from the anterior pectoral fins, found in select myliobatid stingrays. Many benthic batoids utilize undulatory locomotion and use their pectoral fins for both locomotion and prey capture. Pelagic myliobatids that possess cephalic lobes utilize oscillatory locomotion, using their pectoral fins to locomote and their cephalic lobes for prey capture. Despite differences in habitat usage and locomotor modes, these batoids feed on very similar benthic organisms. The purpose of this study was to 1.) compare the morphology of the cephalic lobes and anterior pectoral fins in lobed and lobeless species, looking at skeletal elements, musculature …

Using Habit Reversal To Decrease Filled Pauses And Nervous Habits In Public Speaking, Carolyn Joanne Mancuso

USF Tampa Graduate Theses and Dissertations

ABSTRACT

Public speaking is a challenge faced by people from all walks of life. Research in the area of public speaking has focused on examining techniques to reduce public speaking anxiety. Very little research, however, has focused on the acquisition of public speaking skills. While presenting speeches, many people engage in nervous habits that have the potential to decrease the effectiveness of the speech and their credibility as a speaker. This study evaluated the effectiveness of simplified habit reversal in reducing three of these nervous habits: filled pauses, tongue clicking, and inappropriate use of the word like. Following baseline, participants …

An Exploration Of Threatened Harm As A Type Of Maltreatment And Its Relation To Recurrence Of Maltreatment, Roxann Mcneish

USF Tampa Graduate Theses and Dissertations

There were no studies found in the literature that primarily focused on threatened harm as type of maltreatment. This study utilized Florida's child welfare administrative data to explore threatened harm as a type of maltreatment, particularly as a predictor of recurrence of maltreatment within six and 12 months for children who had a verified report of maltreatment in FY2005-2006. Threatened harm was examined in three ways; when it was reported as the only maltreatment, the initial maltreatment, and in situations where there was a prior report. The most prevalent acts of threatened harm were examined separately. It was examined as …

Gay, Straight, Or Slightly Bent? The Interaction Of Leader Sexual Orientation And Gender On Leadership Evaluations, Fred George Macoukji

USF Tampa Graduate Theses and Dissertations

Abstract

Existing research has shown that gender stereotypes regarding characteristics of men and women influence others' perceptions of their fit with organizational roles, including leadership roles (cf. Eagly & Karau, 2002). However, little research has examined stereotypes regarding other demographic characteristics (e.g., race, sexual orientation) and how they may interact with gender stereotypes to influence leadership evaluations. The current study examined whether leader gender and sexual orientation interact to influence subordinates' evaluations of leader effectiveness, likability, and boss desirability using an experimental design. In addition to examining whether leader gender and sexual orientation interacted to predict leader evaluations, the present …

Assessing Competing Demands And Charting A Course: A Phenomenological Study Of Advanced Placement U.S. History Teachers' Decision Making And Course Planning, Kerry Dean Poole

USF Tampa Graduate Theses and Dissertations

Florida has experienced some of the greatest growth of Advanced Placement (AP) programs in recent years and student scores on the AP exams have evolved into a highly significant metric in evaluating student proficiency and teacher and school effectiveness. Despite this growth, it is not well known how AP teachers make decisions about the content they teach, what learning activities they select, how much the AP exam influences their decision making, how they modify learning opportunities for diverse learners, and how they prepare their students for the College Board AP exam. This interpretive, phenomenological study examines the lived experiences of …

Unanswered Occupational Calling: The Development And Validation Of A New Measure, Michele Wilk Gazica

USF Tampa Graduate Theses and Dissertations

There is a limited body of research that illuminates the various positive life-, health-, and work-related outcomes that an individual may experience through the pursuit of his or her occupational calling. An occupational calling is defined as an occupation that a person feels drawn to, finds intrinsically enjoyable and meaningful, and identifies as a central part of his or her identity. The extant literature on occupational callings, however, rarely considers the possible detrimental effects of having an occupational calling other than to explain unexpected study results. These unexpected study results hint at adverse psychological and job-related outcomes when an individual …

Contrast Adaptation In The Lateral Eye Of Limulus Polyphemus, Tchoudomira Valtcheva

USF Tampa Graduate Theses and Dissertations

Luminance and contrast adaptation are neuronal mechanisms that the retina applies for continuous adjustment to light sensitivity though a collection of cellular and synaptic mechanisms distributed across the retinal network, thus accommodating the wide input range of the visual system within the constricted output range of retinal ganglion cells. Luminance mean adaptation has been demonstrated in the output neurons of the invertebrate eye (eccentric cells), and the aim of the study was to investigate whether the homology in visual processing extends to luminance variance (contrast) adaptation as well. The spike trains of individual eccentric cells were recorded from live horseshoe …

Timely Doctoral Completion Rates In Five Fields: A Two-Part Study, Angela Miller

USF Tampa Graduate Theses and Dissertations

Roughly half of all doctoral students who begin a program do not continue through graduation, and many of them face significant financial losses and emotional burdens as a result. Although this completion rate has stayed fairly constant for the past few decades, it has recently gained attention on a national level. In 2011, the National Research Council published the Assessment of Research Doctorate Programs in the United States, and provided a wealth of data on over 5,000 programs in 212 universities. This study used that dataset to examine the relationship between timely doctoral completion rates and 22 Program, Faculty and …

A Study On The Depiction Of Drug Usage, Alcohol Consumption And Cigarette Smoking In Movies And Its Perceived Effect On A Young Audience. A Comparative Study Of American And Indian Cinema And Their Respective Audiences., Zain Farook Merchant

USF Tampa Graduate Theses and Dissertations

This study analyzes the depiction of drug usage, cigarette smoking and alcohol consumption in

movies in terms of character stereotyping and typecasting. Because movies are focused on making money they are being used as marketing tools by alcohol and cigarette conglomerates (Grube, 2004). The study also explores youth perception of such content and tries to determine the behavioral implications or influence of such content on young children. The goal of this research is to analyze the social cognitive influence of movies on the youth and the effects of censorship in movies today. The research compares this effect in the two …

Skeletal Muscle Contraction Simulation: A Comparison In Modeling, Jonathan M. Ford

USF Tampa Graduate Theses and Dissertations

Computer generated three-dimensional (3-D) models are being used at increasing rates in the fields of entertainment, education, research, and engineering. One of the aspects of interest includes the behavior and function of the musculoskeletal system. One such tool used by engineers is the finite element method (FEM) to simulate the physics behind muscle mechanics. There are several ways to represent 3-D muscle geometry, namely a bulk, a central line of action and a spline model. The purpose of this study is to exmine how these three representations affect the overall outcome of muscle movement. This is examined in a series …

Factors Influencing Vaccination Decisions In African American Mothers Of Preschool Age Children, Chauntel Mckenzie Mcnair

USF Tampa Graduate Theses and Dissertations

Rates and coverage levels of immunizations of African-American children are reduced compared to other races. Few studies have identified factors that influence vaccination decisions of African-American mothers. This study assessed the mothers' vaccination decisions using a self-administered questionnaire and a screening instrument for determining health literacy. This instrument is called Rapid Estimate of Adult Literacy in Medicine (REALM). The sample was 92 African American mothers, recruited from a large metropolitan church in Jacksonville, Florida, who had at least one child under the age of seven. A cross-sectional research design was used to administer survey instruments to identify and interpret parental …

Theory, Synthesis, And Application Of Adiabatic And Reversible Logic Circuits For Security Applications, Matthew Arthur Morrison

USF Tampa Graduate Theses and Dissertations

Programmable reversible logic is emerging as a prospective logic design style for implementation in modern nanotechnology and quantum computing with minimal impact on circuit heat generation. Adiabatic logic is a design methodology for reversible logic in CMOS where the current flow through the circuit is controlled such that the energy dissipation due to switching and capacitor dissipation is minimized. Recent advances in reversible logic using and quantum computer algorithms allow for improved computer architectures. Production of cost-effective Secure Integrated Chips, such as Smart Cards, requires hardware designers to consider tradeoffs in size, security, and power consumption. In order to design …

How Individual Differences In Self- And Other-Focused Co-Rumination Relate To Internalizing Symptoms And Friendship Quality, Heather Smith-Schrandt

USF Tampa Graduate Theses and Dissertations

Co-rumination involves friends spending a great deal of time encouraging each other to excessively discuss problems, with content being largely negative (Rose, 2002). Co-rumination appears to strengthen the bonds between best friends, while ironically exacerbating internalizing symptoms. Co-rumination is conceptualized as a mutual dyadic process, but little is known about the reciprocity of excessive problem discussion. The balance of college students' (N = 601) self- and other-focused co-rumination with their best friend was assessed via an online survey. Contrary to expectations, inconsistent and weak evidence was obtained for differentiating self- and other-focused co-rumination, and their balance. Specifically, self- and other-focused …

An Examination Of The Impact Of Hoarding Parent-Adult Child Relationships And Family Functioning, Jennifer M. Park

USF Tampa Graduate Theses and Dissertations

Compulsive hoarding is characterized by difficulty discarding unneeded items and the accumulation of items within living spaces and is associated with significant functional impairment and distress. Along with the negative impact on the individual, previous reports have indicated that compulsive hoarding is not only impairing and substantially burdensome for family members, but also linked to disruptions in family functioning. The present study utilized a path model analysis to examine the associations between an array of hoarding variables hypothesized to impact family functioning and parent-adult child relationships in 199 adult children of hoarders. Results revealed that family functioning mediated the relationship …

Testing Individual Differences In Negative Affect Related To Smoking: The Role Of Emotional Clarity, Nicole Marquinez

USF Tampa Graduate Theses and Dissertations

Negative affect plays a critical role in nicotine dependence. Smokers report feeling that negative affect is a primary motivation to keep smoking. This study examined the relationship between individual differences in emotional experience, in particular emotional clarity and differentiation (individuals' ability to understand, describe, and differentiate between emotions), and smoking motivation. We hypothesized that emotional clarity would be related to affect, craving, and smoking satisfaction. A second goal was to test the ability of an emotional-labeling intervention to reduce negative affect and smoking motivation resulting from a negative emotion induction. We also tested whether emotional clarity moderated the effect of …

Future Engineering Professors' Conceptions Of Learning And Teaching Engineering, Ana Teresa Torres Ayala

USF Tampa Graduate Theses and Dissertations

Conceptions of learning and teaching shape teaching practices and are, therefore, important to understanding how engineering professors learn to teach. There is abundant research about professors' conceptions of teaching; however, research on the conceptions of teaching of doctoral students, the future professors, is scarce. Furthermore, there is a need to understand not just future engineering professors' conceptions of teaching but also their conceptions of learning. The purpose of this study was to explore qualitative variations in future engineering professors' conceptions of learning and teaching as well as understanding how they came to these conceptions.

The research questions that guided this …

Students' Perceptions On Issues Related To Globalization At A Four-Year Community College In Florida, Vickie Hall Stevens

USF Tampa Graduate Theses and Dissertations

The purpose of this dissertation was to survey community college students in order to evaluate their perceptions of the awareness and significance of global-mindedness or worldview of interconnectedness to the global community. The sample of participants included students at a 4-year community college in Florida. The results can be valuable and informative as a needs assessment in curriculum reforms to provide more globally minded courses and programs; consequently, better prepare graduates to compete in the global job market.

Hydraulic Evaluation Of A Community Managed Wastewater Stabilization Pond System In Bolivia, Louis Lizima

USF Tampa Graduate Theses and Dissertations

This work explores the hydraulic performance of a wastewater lagoon system located in San Antonio, Bolivia. The system consists of one facultative pond and two maturation ponds in series and is managed through a locally elected water committee. A tracer study was performed on the primary facultative pond and an analysis of the solids accumulation on the bottom of the facultative lagoon was also performed. The results were used to generate residence time distribution curves and provide an estimate of mean residence time in the system. The data was used to examine hydraulic efficiency as it relates to short-circuiting and …

Environmental And Energy Saving Technologies Of Vinyl Chloride Production, Mykola Kurta

USF Tampa Graduate Theses and Dissertations

Recently, because of the increase of environmental concerns in process design, the need to enhance conversion to product and prevent generation of wasteful byproducts in the reactor network has become urgent. This prevents high cost treatment and separation costs downstream in the process. Therefore, in this thesis I focus on making production of vinyl chloride monomer (VCM) more efficient and on possible ways of industrial organochlorine waste (OCW) recycling. In particular, in the first experiment, we investigate how catalyst and its structure can affect product output.

Infrared spectroscopy and X-ray diffraction analysis were utilized to investigate the structure of the …

Do Changing Reference Levels Affect The Long-Term Effectiveness Of Incentive Contracts?, Lee Michael Kersting

USF Tampa Graduate Theses and Dissertations

This study examines whether reference levels change over time and the impact on individuals' risk-taking behavior. I apply expectations-based reference-dependent preferences theory to analyze whether individuals' reference levels change over time in an economic setting. The theory suggests that individuals develop reference levels based on expectations of future outcomes (Koszegi and Rabin 2006). Therefore, this study examines whether individuals' expectations affect the setting of their reference level and how possible changes in reference levels affect subsequent risk-taking behavior. This study also provides evidence on how budget-based contracts impact individual risk taking behavior in a single period setting. Prior research has …

The End Of Anarchy: Weapons Of Mass Destruction And The States System, Gregory Edward Johnson

USF Tampa Graduate Theses and Dissertations

The basis of this thesis is that weapons of mass destruction will continue to proliferate and will inevitably - given enough time- be used against civilian populations repeatedly.

As this occurs the opposition between support for international law and the power of the state will intensify. This will go on for some time and will, in all probability, become extremely destructive. Eventually, however, the states (and individual people) of the world will realize that the simultaneous existence of international anarchy and weapons of mass destruction runs counter to long term human survival. This realization will , very likely, lead people …

Location And Capacity Modeling Of Network Interchanges, Aldo D. Fabregas

USF Tampa Graduate Theses and Dissertations

Network design decisions, especially those pertaining to urban infrastructure, are made by a central authority or network leader, and taking into consideration the network users or followers. These network decision problems are formulated as non-linear bi-level programming problems. In this work, a continuous network design problem (CNDP) and discrete network design problem (DNDP) bi-level optimization programs are proposed and solved in the context of transportation planning. The solution strategy involved reformulation and linearization as a single-level program by introducing the optimality conditions of the lower level problem into the upper level problem. For the CNDP, an alternative linearization algorithm (modified …

Memory And Truth In Human Rights: The Argentina Case. The Issue Of Truth And Memory In The Aftermath Of Gross Human Rights Violations In Argentina., Andres Delgado

USF Tampa Graduate Theses and Dissertations

This thesis focuses on the importance of truth and memory in the process of transitional justice, within the context of the aftermath of gross violations of human rights that occurred during the military dictatorship of 1976 to 1983 in Argentina. The military junta that ruled Argentina took power under the pretext of national security, arguing that an enemy threatened to destabilize and destroy Argentine society. During the period of the military dictatorship an estimated 30,000 people "disappeared"; relatives of those disappeared mobilized and formed human rights organizations to confront the military regime for its abuses. Once the dictatorship collapsed and …

The Relationship Between Rating Scales Used To Evaluate Tasks From Task Inventories For Licensure And Certification Examinations, Adrienne W. Cadle

USF Tampa Graduate Theses and Dissertations

The first step in developing or updating a licensure or certification examination is to conduct a job or task analysis. Following completion of the job analysis, a survey validation study is performed to validate the results of the job analysis and to obtain task ratings so that an examination blueprint may be created. Psychometricians and job analysts have spent years arguing over the choice of scales that should be used to evaluate job tasks, as well as how those scales should be combined to create an examination blueprint. The purpose of this study was to determine the relationship between individual …

Cuba's Chords Of Change: Music, Race, Class & Motherhood At The Turn Of The 21st Century, Saundra Marie Amrhein

USF Tampa Graduate Theses and Dissertations

This thesis is an ethnography and biographical study that examines the impact of the immense socioeconomic changes underway in Cuba at the turn of the 21st century and the flexible identity categories through which individuals navigate a social crisis.

The biography and ethnography in this thesis are centered on the life of Violeta Aldama, an aging revolutionary and Afro-Cuban mother who struggles to make ends meet while fighting to steer her son, Brian, through a classical music education and into a music career. Amid growing racial inequalities when many Afro-Cubans are locked out of the most lucrative jobs in the …

Climate, Neo-Spinozism, And The Ecological Worldview, Nancy M. Kettle

USF Tampa Graduate Theses and Dissertations

The global community faces ecological problems with the natural environment and cultural impediments to solving them. Natural systems are constantly changing and so are cultural practices. Humans need to address both: the interaction between those dynamic systems, the natural and cultural, because what happens in one system changes things in the other. The changes to the ecosystems are rapid and sometimes irreversible while dealing with them has been inadequate. Environmental movements, including deep ecology, have been at the forefront of the efforts to engage the public, various groups, politicians, and world governments to address environmental problems on a coordinated large …

Media That Objectify Women: The Influence On Individuals' Body Image And Perceptions Of Others, Ross Krawczyk

USF Tampa Graduate Theses and Dissertations

Past research has examined body image and eating-related outcomes of exposure to mass media. This research has generally found that such exposure is a significant risk factor for body image disturbance and disordered eating. However, a causal relationship has not yet been firmly established. Several theories, including objectification theory (Fredrickson & Roberts, 1997), have attempted to explain this relationship with some success. The current study had two primary goals. First, it was designed to further explore the potential causal relationship between mass media exposure and body image and affect disturbance. Second, it attempted to go beyond individuals' body image and …

Crossing Cultural Boundaries: Explorations In Multilingual Teaching And Learning, Patriann Smith

USF Tampa Graduate Theses and Dissertations

A transdisciplinary notion of learning considers what is between, above, and beyond the disciplines. Adherence to such a perspective warrants examination of any research endeavor from multiple entry points and from openness to the changing nature and infinity of knowledge. In this dissertation, "Crossing Cultural Boundaries: Explorations in Multilingual Teaching and Learning," I approached the study of language and literacy teaching and learning across multilingual and multicultural contexts via an optional dissertation process that required completion of multiple studies. This dissertation option allowed me three entry points: (a) an understanding of literacy and language policy in relation to language learners …

The Influence Of Campus Culture On Mental Health Help-Seeking Intentions, Jason I. Chen

USF Tampa Graduate Theses and Dissertations

Mental health issues are widespread on college campuses. However, the majority of these individuals do not seek help. Prior research suggests many factors which may be related to mental health help-seeking including age, gender, and prior treatment experience. There has however been little work considering the context of the college campus on mental health help-seeking, specifically the influence of campus culture. Accounting for the context of mental health help-seeking may help to determine which social groups have the greatest influence on mental health treatment processes.

The purpose of this study was to explore the relationship between perceived peer, student body, …

The Assessment Of An In-Vitro Model For Evaluating The Role Of Parp In Ethanol-Mediated Hepatotoxicity, Jayme Coyle

USF Tampa Graduate Theses and Dissertations

This investigation assesses the role of poly(ADP-ribose) polymerase in ethanol-mediated hepatotoxicity using the untransfected HepG2 hepatocellular carcinoma line, an established, well-characterized toxicological model. HepG2 cells were treated with ethanol at concentrations between 100 mM and 800 mM, and assessed for markers of cytotoxicity. PARP-1 activity in total cell protein lysates was quantified as a proxy of apoptotic induction at six hours. Our results demonstrated a 1.43-fold AST activity increase in culture medium isolates of cells exposed to 800 mM without significant effect on cellular viability. PARP-1 activity varied greatly and results for enzyme activity remained inconclusive. The results suggest a …