Digital Commons Network^™

Systems Approach To Producing Electrospun Polyvinylidene Difluoride Fiber Webs With Controlled Fiber Structure And Functionality, Brian D. Bell

USF Tampa Graduate Theses and Dissertations

Polyvinylidene difluoride (PVDF) is a functional polymeric material that can be used for a wide variety of applications. There are many new future applications that were recently suggested for electrospun PVDF fibers. Electrospinning is a process capable of producing nano to micro sized PVDF fibers in a web. It is important to control the structure of the web during electrospinning because by controlling the structure of the web it is possible for the PVDF fiber web to have increased performance in comparison to other common forms of PVDF.

While past scientific literature focused on applications of PVDF fibers, little was …

A Framework For Determining Building Water Cycle Resilience Using A Dynamic Water Resilience Assessment Model (Wram), Caryssa Joustra

USF Tampa Graduate Theses and Dissertations

The aim of this project was to quantitatively measure the resilience of the building water cycle. In order to accomplish this goal, a framework was developed that outlines how building water resilience can be evaluated. The framework presented assumed that resilience describes the fulfillment of system functions; in this case, the system functions considered are those actualized by the building water system. A building water resilience assessment model (WRAM) was developed with the ability to simulate different building water cycles and resilience scenarios. Resilience is dependent on the type and magnitude of a disturbance. Therefore, unique disruption scenarios were developed …

Glaciological Applications Of Terrestrial Radar Interferometry, Denis Voytenko

USF Tampa Graduate Theses and Dissertations

Terrestrial Radar Interferometry (TRI) is a relatively new ground-based technique that combines the precision and spatial resolution of satellite interferometry with the temporal resolution of GPS. Although TRI has been applied to a variety of fields including bridge and landslide monitoring, it is ideal for studies of the highly-dynamic terminal zones of marine-terminating glaciers, some of which are known to have variable velocities related to calving and/or ocean-forced melting. My TRI instrument is the Gamma Portable Radar Interferometer, which operates at 17.2 GHz (1.74 cm wavelength), has two receiving antennas for DEM (digital elevation model) generation, and images the scenes …

A Composite Spatial Model Incorporating Groundwater Vulnerability And Environmental Disturbance To Guide Land Management, Johanna L. Kovarik

USF Tampa Graduate Theses and Dissertations

Research has long recognized and studied the dynamics of groundwater processes. More recently, groundwater dependent ecosystems (GDEs) are being recognized for their diversity and vulnerability to anthropogenic impact. Groundwater in karst landscapes presents a distinctive situation where flow through the subsurface often moves rapidly on the scale of days and weeks as opposed to years or millennia in other systems. This distinctive situation of karst systems and their vulnerability to human impacts necessitate an integrated and multifaceted approach for the management of these important resources. However, development of such an approach is complicated by the difficulty of obtaining detailed data …

Statistical Learning With Artificial Neural Network Applied To Health And Environmental Data, Taysseer Sharaf

USF Tampa Graduate Theses and Dissertations

The current study illustrates the utilization of artificial neural network in statistical methodology. More specifically in survival analysis and time series analysis, where both holds an important and wide use in many applications in our real life. We start our discussion by utilizing artificial neural network in survival analysis. In literature there exist two important methodology of utilizing artificial neural network in survival analysis based on discrete survival time method. We illustrate the idea of discrete survival time method and show how one can estimate the discrete model using artificial neural network. We present a comparison between the two methodology …

Pathogenic Policy: Health-Related Consequences Of Immigrant Policing In Atlanta, Ga, Nolan Sean Kline

USF Tampa Graduate Theses and Dissertations

Multilayered immigration enforcement regimes comprising state and federal statutes and local police practices demand research on their social and health-related consequences. This dissertation explores the multiple impacts of immigrant policing: sets of laws and police activities that make undocumented immigrants more visible to authorities and increase their risk of deportation. Examining immigrant policing through a multi-sited framework and drawing from principles of engaged anthropology, findings from this dissertation suggest how immigrant policing impacts undocumented immigrants' overall wellbeing, health providers' professional practice, and reveals troubles with safety net medical care. Interviews and participant observation experiences suggest how immigrant policing perpetuates a …

Metal Organic Frameworks (Mofs) And Porous Organic Polymers (Pops) For Heterogeneous Asymmetric Catalysis, Youngran Ji

USF Tampa Graduate Theses and Dissertations

The administration of enantiopure drugs brings advantages such as improved efficacy, more predictable pharmacokinetics and reduced toxicity from the point of view of the pharmaceutical area.[1] For this reason, a tremendous amount of supply and demand for enantiomeric pure compounds has been shown not only in market, but industry and academia.[^2-4] According to the industry publication Genetic Engineering and Biotechnology News (GEN) in 2014, 22 billion dollars were accounted for enantiopure form of drugs such as Sovaldi® (Sofosbuvir), Crestor® (Rosuvastatin), and Advair® (fluticasone/salmeterol).

The fact that one enantiomer can be pharmacologically effective whereas the other enantiomer can be …

Altered Intraerythrocytic Development Phenotypes Of Artemisinin-Resistant Plasmodium Falciparum Confer A Fitness Advantage, Amanda Hott

USF Tampa Graduate Theses and Dissertations

Resistance to artemisinin combination therapies (ACTs) has emerged in southeast Asia threatening the most widely used treatment against antimalarial-resistant Plasmodium falciparum worldwide. Artemisinin resistance has been associated with a reduced rate of parasite clearance following treatment with an ACT and is attributed to increased survival of ring-stage parasites. Single nucleotide polymorphisms (SNPs) in kelch gene (K13) has been associated with delayed in vivo clearance half-life of artemisinin-resistant P. falciparum and is the only known molecular marker of resistance. The absence of reliable in vitro phenotypes for artemisinin resistance has limited our understanding of the resistance mechanism(s) and fitness costs, therefore …

Enhanced Magnetoimpedance And Microwave Absorption Responses Of Soft Ferromagnetic Materials For Biodetection And Energy Sensing, Jagannath Devkota

USF Tampa Graduate Theses and Dissertations

A combination of magnetic sensors with magnetic nanoparticles offers a promising approach for highly sensitive, simple, and rapid detection of cancer cells and biomolecules. The challenge facing the field of magnetic biosensing is the development of low-cost devices capable of superconducting quantum interference device (SQUID)-like field sensitivity at room temperature. In another area of interest, improving the sensitivity of existing electromagnetic field sensors for microwave energy sensing applications is an important and challenging task. In this dissertation, we have explored the excellent magnetoimpedance and microwave absorption responses of soft ferromagnetic amorphous ribbons and microwires for the development of high-performance magnetic …

Impacts Of Agrochemical Pollution On Aquatic Communities And Human Disease, Neal T. Halstead

USF Tampa Graduate Theses and Dissertations

The global human population is expected to exceed 9 billion individuals by 2050, putting greater strain on the natural resources needed to sustain such a population. To feed this many people, some expect agricultural production will have to double and agrochemical use will have to increase anywhere from two- to five-fold relative to the turn of the century. Although industrial agriculture has provided many benefits to society, it has caused declines in biodiversity, both directly (e.g., through conversion of habitat) and indirectly (e.g., through contamination of adjacent natural habitats). Agricultural activity has also been linked to increased prevalence and intensity …

Analytics And Healthcare Costs (A Three Essay Dissertation), Lina Bouayad

USF Tampa Graduate Theses and Dissertations

Both literature and practice have looked at different strategies to diminish healthcare associated costs. As an extension to this stream of research, the present three paper dissertation addresses the issue of reducing elevated healthcare costs using analytics. The first paper looks at extending the benefits of auditing algorithms from mere detection of fraudulent providers to maximizing the deterrence from inappropriate behavior. Using the structure of the physicians' network, a new auditing algorithm is developed. Evaluation of the algorithm is performed using an agent-based simulation and an analytical model. A case study is also included to illustrate the application of the …

Hpv Vaccine Decision-Making Among Male Sexual Minorities: An Integrative Theoretical Framework For Vaccine Promotion, Christopher W. Wheldon

USF Tampa Graduate Theses and Dissertations

Men who have sex with men (MSM) are at increased risk of anal cancer as a result of anal HPV infection. Routine HPV vaccination is recommended for all MSM up through age 26; however, vaccine uptake among this population is low. The Integrative Model of Behavioral Prediction (IM) was used to identify, describe, and explain psychosocial factors related to HPV vaccine decision-making for young MSM. A sequential mixed-methods approach consisting of semi-structured interviews, a quantitative survey, and a qualitative open-ended survey was used to address the following aims: (1) Determine salient outcome, normative, efficacy, and control beliefs related to HPV-vaccination …

Development Of Orally Bioavailable 4(1H)-Quinolones And 1,2,3,4-Tetrahydroacridin-9(10H)-Ones With Potent Anti-Malarial Activity, Jordany Richarlson Maignan

USF Tampa Graduate Theses and Dissertations

Although Malaria rates are on the decline due to the efforts of the World Health Organization and other organizations dedicated to the eradication of this disease, a relaxed attitude towards the development of new antimalarial entities would be flawed. Due to the emergence of resistance in the parasite, the almost 50% world-wide reduction in malarial death rates that have been produced over the past 15 years are threatening to be lost

New drugs are urgently needed and our approach focuses on the re-evaluation and optimization of the historic antimalarial ICI 56,780. Due to its causal prophylactic activity, along with its …

Assessment Of The Impact Of Attention Deficit Hyperactivity Disorder On Type 1 Diabetes, Kellee Miller

USF Tampa Graduate Theses and Dissertations

Individual day-to-day management and effective control of type 1 diabetes (T1D) is ultimately driven by decisions made by the individual. Individuals with attention deficit hyperactivity disorder (ADHD) have a higher tendency to be inattentive, impulsive, and hyperactive. Attention deficits and impulsivity among adolescents and adults with T1D could result in poor diabetes management through infrequent self-monitoring of blood glucose and inadequate insulin dosing – key components of achieving optimal glycemic control.

This study included 7,380 adolescents and young adults, ages 13-25 years, participating in the T1D Exchange clinic registry (median age 17.4 years, duration 7.7 yrs, 50% female, 81% white). …

Additives For Heat Transfer Enhancement In High Temperature Thermal Energy Storage Media: Selection And Characterization, Philip D. Myers Jr.

USF Tampa Graduate Theses and Dissertations

Inorganic salts are very promising as high-temperature heat transfer fluids and thermal storage media in solar thermal power production. The dual-tank molten salt storage system, for example, has been demonstrated to be effective for continuous operation in solar power tower plants. In this particular storage regime, however, much of the thermal storage potential of the salts is ignored. Most inorganic salts are characterized by high heats of fusion, so their use as phase-change materials (PCMs) allows for substantially higher energy storage density than their use as sensible heat storage alone. For instance, use of molten sodium-potassium eutectic salt over a …

Women’S Use Of And Decision‐Making Regarding Geo‐Social Networking Applications To Arrange Sexual Experiences, Shireen Mary Noble

USF Tampa Graduate Theses and Dissertations

The purpose of this thesis was to learn more about geo-social networking applications and how they are used by women to meet sexual partners. Currently, there are no known studies that have looked at heterosexually-oriented geo-social networking applications or at the way women have used these apps for heterosexual sexual encounters. This thesis attempts to begin to bridge this gap in the literature.

For the first study, apps were selected based on their appearance in popular media articles about dating applications. Results generally related to online safety concerns, while occasional features were related to sexual safety concerns. Communication options were …

The Triumvirate Of Intersectionality: A Case Study On The Mobilization Of Domésticas In Brazil, Kristen Lei Nash

USF Tampa Graduate Theses and Dissertations

In this thesis, I look at the mobilization of the domestic workers in Brazil as a social movement. In Brazil, the domestic workers have managed to organize continuously for over eight decades using both informal and formal mechanisms to connect workers all over the country in unique ways. By viewing these women and the ways in which they have organized in the framework of a social movement, we can begin to identify their repertoires of contention and how those repertoires have contributed to the successes of the movement. In order to guide this investigation, I ask, how has the doméstica …

Evaluation Of School Vip Latrines And User Preferences And Motivations For Adopting Communal Sanitation Technologies In Zwedru, Liberia, Sarah J. Ness

USF Tampa Graduate Theses and Dissertations

This thesis has three objectives as follows: 1) to investigate VIP latrine design and establish if the communal school VIP latrines located on the shared campus of Tubman Wilson Institute (TWI) Junior and Senior High School and J.C. Barlee Elementary School were properly designed and constructed, 2) to explore the user preferences and motivations impacting the adoption of these school latrines, and 3) to develop a framework for factors that influence latrine adoption. These goals were formed by the author in response to her Peace Corps experience working at a high school in Zwedru, Liberia from August 2012 to August …

Undergraduate College Students’ Attitudes About Internet-Based Mental Health Interventions, Kathleen Palmer

USF Tampa Graduate Theses and Dissertations

Millennial-aged young adults, often referred to as “digital natives,” comprise the typical college-age population, and there has been a growing number college students at risk for mental health problems (Mowbray, Mandiberg, Stein, Kopels, Curlin, Megivern, Strauss, Collins & Lett, 2006; Eisenberg, Gollust, Golberstein & Hefner, 2007). Suicide is the second leading cause of death among college students (Suicide Statistics, 2014); however, their rate of utilizing mental heath counseling is decreasing. Providing the types of mental health services college students are likely to use can mitigate factors thought to impede their use (e.g., stigma, anonymity, confidentiality), as well as help improve …

Attentional Allocation In Language Processing In Adults Who Stutter: Erp Evidence, Wendy Lorraine Olsen

USF Tampa Graduate Theses and Dissertations

The aim of this study was to investigate how young adults who stutterer allocate attentional resources during two linguistic stages in picture naming, specifically lemma and lexeme retrieval. This study reports on behavioral and brain electrophysiological data collected during a simple auditory oddball task and a Dual Picture-Word Interference/Tone Monitoring Task.

Effects Of Nicotine Withdrawal On Motivation, Reward Sensitivity And Reward-Learning, Jason A. Oliver

USF Tampa Graduate Theses and Dissertations

Research on addictive behavior has traditionally emphasized the role that primary reinforcing effects of drugs of abuse plays in the development and maintenance of dependence. However, contemporary behavioral economic theory and animal models of nicotine dependence suggest the need for greater attention to the impact that response to alternative rewards may have on smoking behavior. The present study sought to investigate the impact of nicotine withdrawal on self-report, behavioral and neural indices of motivation, immediate response to rewards and the capacity to learn and modify behavior in response to positive and negative feedback. Heavy smokers (n = 48) completed two …

Feeling At Home With Grief: An Ethnography Of Continuing Bonds And Re-Membering The Deceased, Blake Paxton

USF Tampa Graduate Theses and Dissertations

Bereavement scholars Silverman, Nickman, and Klass (1996) have argued that rituals to continue a relationship with the deceased do not have to be considered pathological in nature. Since their work, scholars have offered specific strategies for the bereaved to actively construct a bond after death, including telling stories about those who have died, having imagined conversations with the deceased, celebrating their birthdays and anniversaries, and reviewing artifacts that represent or once belonged to them (among other strategies). Hedtke and Winslade (2004) call these “re-membering” processes by which the deceased can regain active membership in their loved ones lives. This dissertation …

Assessment Of Public Health Risks Associated With Petrochemical Emissions Surrounding An Oil Refinery, Erin L. Pulster

USF Tampa Graduate Theses and Dissertations

Refinery operations have been associated with a wide variety of atmospheric emissions consisting of criteria air pollutants, volatile organic components, hazardous air pollutants as well as other pollutants. With approximately 100 oil refineries in the Wider Caribbean region (WCR), hydrocarbons in this region pose significant environmental and human health risks. One of the oldest and largest refineries in the WCR is the Isla Refineriá, which is located on the island of Curaçao, and has been the basis of historical debates and conflict between the public and the local government over the environmental and human health risks. This research aims to …

Ikaros Deficiency Leads To An Imbalance In Effector And Regulatory T Cell Homeostasis In Murine Pancreatic Cancer, Nadine D. Nelson

USF Tampa Graduate Theses and Dissertations

Pancreatic cancer is one of the deadliest cancers with a five-year survival rate of 6%. Pancreatic cancer is resistant to conventional chemotherapy and is usually diagnosed at late stages. Current treatment options have minimal effects in extending patients' lives beyond 10 months. One significant limitation in developing treatments to combat pancreatic cancer is its immunosuppressive microenvironment. Pancreatic cancer secretes factors that activate immunosuppressive cells, such as regulatory T cells (Tregs). These Tregs suppress effector CD4⁺ and CD8⁺ T cell anti-tumor immune responses. Therefore, novel treatment options to reduce Treg-mediated immune suppression and increase the numbers and functions of …

Ground-Coupled Air Waves: A Seismological Case Study Of The Explosion Quakes Of The 2007 Eruption Of Pavlof Volcano, Alaska, Cassandra Marie Smith

USF Tampa Graduate Theses and Dissertations

An abnormally high number of explosion quakes were noted during the monitoring effort for the 2007 eruption of Pavlof Volcano on the Alaskan Peninsula. In this study we manually counted the explosion quakes from their characteristic ground-coupled air waves. This study makes an effort at better quantifying the number of explosion quakes and how the characteristic ground-coupled air waves are affected by wind direction and wind speed. Additionally this study investigates how the ground coupled air waves might be used in a monitoring or analysis effort by calculating energy release and gas mass release. Over 3.2x10⁴ quakes were recorded. …

Genetic Moderation Of Phenotypic And Neural Indicators Of Peer Influenced Risk-Taking Behavior: An Experimental Investigation, Troy Alan Webber

USF Tampa Graduate Theses and Dissertations

Risk-taking behavior (RTB) is defined as behavior involving the probability of reward with concurrent probability of some negative outcome. Peer influence is among the most robust predictors of RTB, such that greater peer influence, particularly deviant or delinquent peer influence, is associated with increased RTB. Evidence suggests that those with genetic predispositions for RTB may also be more susceptible to peer influence as a function of genotype. Given that genetic polymorphisms within the dopaminergic system have evidenced associations with various forms of RTB and delinquent peer affiliation, it is possible that these genes may interact with peer influence to predict …

Southern Chivalry: Perception Of Health & Environmental Justice In A Small Southern Neighborhood, Brian S. Brijbag

USF Tampa Graduate Theses and Dissertations

This paper analyzes heath risk and how it is communicated to, and understood within, a predominantly African American neighborhood in central Florida. Residents accuse the county department of public works of purposeful contamination and discrimination over a period of 30 years. I raise the questions of how risk is perceived and what roles race or class may play. I also developed a model for risk communication that includes all stakeholders. Finally, I expand the conversation of health disparities to include issues of widening gaps in perceptions of health.

This was examined by looking at the following:

1. The lack of …

Population Dynamics Of The Little Gulper Shark (Centrophorus Uyato) And Community Analyses Of Elasmobranch Species In The Northern Gulf Of Mexico, Jacquelin Joye Hipes

USF Tampa Graduate Theses and Dissertations

In chapter 1 I describe the population dynamics of an understudied species of gulper shark, Centrophorus uyato (common name, the Little Gulper), found in the Northern Gulf of Mexico. Sharks in the family Centrophoridae are mid-sized, demersal fish, with seven species identified in North American waters. These deepwater species can be difficult to study due to the extreme depths at which they occur. During four longlining cruises from 2012-2014, 593 sharks were landed, predominantly in the Mississippi Canyon off the Louisiana coast. Mean depth of capture was 290 m. Supplementing these data are catch records for C. uyato from a …

A Multilevel Examination Of Cultural Moderators Of The Job Demands-Resources Model, Seulki Jang

USF Tampa Graduate Theses and Dissertations

Although the Job Demands-Resources Model (JD-R) is the dominant theoretical framework used to understand the relationship between workplace factors and employee well-being, the cross-cultural generalizability of this model has seldom been directly tested. Therefore, this study examined whether and to what extent relationships between: 1) job demands (i.e., organizational constraints) and strain (i.e., job satisfaction, and turnover intentions) and 2) job resources (i.e., job control, participation in decision-making, direct supervisor support, senior leader support, and clear goals and performance feedback) and strain were moderated by cultural dimensions (i.e., individualism-collectivism and uncertainty avoidance). Survey data from workers in 28 countries were …

Personality As A Predictor Of Occupational Safety: Does It Really Matter?, Stephanie Anne Andel

USF Tampa Graduate Theses and Dissertations

Past research demonstrates the high prevalence of occupational accidents and injuries, and therefore much work has gone into examining potential antecedents to such incidences. However, while some research has examined personality as a potential antecedent, results suggesting personality as a significant predictor of occupational safety remain inconclusive. Therefore, the purpose of the current work is to conduct a cross-sectional multi-source survey study that will take a closer look at the relationships between various personality variables and occupational safety. Essentially, the purpose of the current study is threefold: (1) to examine the relationships between two Big Five personality factors, safety locus …