Digital Commons Network^™

Corrosion Performance Of Carbon And Galvanized Steel In Calcium Silicate Cement, Maria Cardoso

USF Tampa Graduate Theses and Dissertations

The concrete manufacturing industry has faced challenges with reducing carbon dioxide emissions as it currently produces about 8% of the world’s anthropogenic carbon dioxide emissions. With global atmospheric carbon dioxide concentrations being higher than ever, the solution is urgent. Due to this, a more sustainable type of concrete has been proposed.Calcium silicate cement (CSC) composed of essentially the same raw materials as ordinary portland cement (OPC) cures through the consumption of carbon dioxide rather than hydration like OPC. CSC is being explored as a potential alternative to OPC, however, there is little to no information on its corrosion related durability. …

Orthogonal Saw Biosensor Fem Simulation Based On St-Quartz With Crystalline Zno Guiding Layer, Saurabh Patwardhan

USF Tampa Graduate Theses and Dissertations

Detection of trace amounts of biomarkers is a critical requirement in sensing the presence of conditions such as early-stage cancer. The ST cut of the Quartz crystal (ST-Quartz) supports two fundamental surface acoustic waves (SAWs) in mutually perpendicular, or orthogonal, directions: the Rayleigh wave and the shear-horizontal wave (RSAW and SH-SAW, respectively). The orthogonality enables the use of ST-Quartz in biofouling removal by the RSAW and mass sensing via the SH-SAW simultaneously. The purpose of this study is to find an ideal guiding layer and wavelength configuration that can enhance the sensing capability without sacrificing the biofouling removal ability for …

Community Heritage: A Source Of Health/Medical Aspirational Capital For Black Males, Lafrance Clarke Jr.

USF Tampa Graduate Theses and Dissertations

There is a recognized need for more Black male healers who pursue careers in medical fields.Thus, the purpose of this study was twofold: to explore historical documents to tell the histories of men of African descent who practiced healing in Florida and, from those histories, create a virtual heritage tour to support teaching about leadership through African American history and narratives of healing. The research questions were: How does the heritage curriculum history about Black men healers of FL provide a historical counter-narrative about Black men and their leadership in connection to health/medicine?How do historical counter-narratives about Black men support …

The Effects Of Motivationally Enhanced Digital Game-Based Learning On Undergraduate Students’ Learning Motivation, Mathematics Achievement, And Learning Retention In College Algebra, Dennis Ward

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to design, develop, and test the effects of digital game-based learning on undergraduate students’ learning motivation, mathematics achievement, and learning retention in a college algebra course. Digital games utilize interactive digital media that offer rules-based challenges and react to the individual’s choices. Digital games have been used in preschool, K-12, higher education, and workplace environments in a wide range of subject areas, including language arts, secondary language acquisition, social studies, science, and math. Specifically, the effectiveness of digital game-based learning on students’ learning and motivation has been studied in college-level mathematics courses. However, previous …

Farmer Adoption Of Advanced Technology In Agribusiness, Justin W. Belcher

USF Tampa Graduate Theses and Dissertations

Normally, family-owned farms are slow to adopt advanced technologies though these technologies can provide several benefits to the farm and have the potential to increase farm production volumes to help meet future population growth. The goal of this study was to document the factors that influence the adoption decision of advanced technologies by family-owned farms and what strategies can be used to motivate adoption. Case study research was conducted to gather data in a more structured way from family-owned farms typically excluded from past research for the purpose of comparing similarities across similar and dissimilar farms. For generalizing similarities, a …

Plasma Treatment Of Polyethylene And Polydimethylsiloxane By Air, Oxygen, And Carbon Tetrafluoride And Their Characterization, Osman Polat

USF Tampa Graduate Theses and Dissertations

In this thesis, low density polyethylene (LDPE) and polydimethylsiloxane (silicone/PDMS) were treated with oxygen (O2) , air and carbon tetrafluoride (CF4) low pressure 13.56 MHz radiofrequency plasma. An experimental setup was used to determine process power and irradiation time for improved modification, the validation was done by measuring the contact angle of the treated samples immediately after treatment. The modification used commercially available sheets to imitate its use in the industry and various applications. The treatment aims to increase/decrease the surface free energy, making it possible to modify the intrinsic inert materials without affecting the bulk. Increased wettability, adhesion, and …

Surviving A Broken System: Synergies Between Solidarity Economies And Sustainable Development Goals, Julie Beach

USF Tampa Graduate Theses and Dissertations

Capitalism has created problems including wealth polarization, rapid depletion of natural resources, and pervasive systemic societal issues. Hard work is not enough to solve the unequal distribution and barriers preventing access to necessities. Sustainable Development Goals (SDGs) were created to remedy the harsh reality of global inequities and negative environmental impacts by working towards a more just and equitable future for all. Solidarity Economies (SE) offer an alternative framework to achieve these goals.

This research used multiple qualitative methods to investigate the synergies between SE and SDGs in a growing urban environment. St. Petersburg, FL struggles with affordable housing, food …

Development Of An Automated Platform For Sensing And Differentiating Vapor-Phase Btex Constituents, Jonathan Samuelson

USF Tampa Graduate Theses and Dissertations

Light aromatic hydrocarbons are an inevitable byproduct of fossil fuel extraction, refinement, distribution, and use. The four lightest and most prevalent of these are benzene, toluene, ethylbenzene, and xylene, which are known collectively as BTEX. In spite of their chemical similarity these species have markedly different effects on human health and substantially different concentrations are permitted by OSHA in workplaces and by the EPA in ambient air and groundwater. Real-time detection, identification, and quantification of these species is therefore of great importance wherever they see industrial use.This work represents the continuation and advancement of a line of research in which …

Saudi Pre-Service Teachers’ Beliefs And Practices Regarding Digital Technology In Early Years Education: A Qualitative Case Study, May Mohammed Alyaeesh

USF Tampa Graduate Theses and Dissertations

This study investigated Saudi pre-service teachers’ beliefs and practices regarding digital technology in early years classrooms. It sought to determine whether participants were prepared to employ such technology to meet the objectives of the Saudi Vision 2030 national development program. This topic was viewed through the lens of the TPACK framework. The study found that the student teachers were not sufficiently prepared to infuse digital technology. They held positive beliefs about digital technology infusion but were concerned about young children’s use of this technology. There was an absence of effective practices, participants’ technical competence was very basic, and their recognition …

Statistical Methods For Reliability Test Planning And Data Analysis, Oluwaseun Elizabeth Otunuga

USF Tampa Graduate Theses and Dissertations

This dissertation develops several statistical methods to advance the techniques and applications in the fields of reliability test planning and data analysis as well as statistical modeling and analysis in survival analysis.

The first project focuses on developing new demonstration test plans for lifetime data based on considering multiple objectives. Reliability demonstration tests have been broadly used for assuring reliability performance at the desired confidence level. We consider lifetime data that follows a Weibull distribution which has been broadly used for modeling a variety of shapes of lifetime distributions. When planning a demonstration test, there are often multiple aspects to …

Minecraft In Language Teacher Education: Acceptance And Integration In Practice, Kristen E. Fung

USF Tampa Graduate Theses and Dissertations

In today’s technological era, understanding if and how teachers’ acceptance and integration of technology evolves is critical to understanding their needs. Technology creates complicated demands on educators and research shows various factors may contribute to their limited success at integrating it (Bustos & Nussbaum, 2009). Research also shows that teachers’ perceptions and attitudes towards pedagogical innovations and information and communication technologies are prominent factors that impact adoption and integration (Tejedor & Muñoz-Repiso, 2006), and the perceptions teachers develop as pre-service teachers influence their classroom performance as in-service teachers (Moon et al., 2016). While research shows plentiful evidence of the educational …

Comparison Study Of Consumer’S Perception Toward Urban Air Mobility In The United States And Rest Of The World Using Social Media Information, S M Toki Tahmid

USF Tampa Graduate Theses and Dissertations

Urban Air Mobility (UAM) is a wide concept that will enable access to on-demand air mobility, cargo delivery, medical applications, and emergency services that is run through a connected and integrated transportation system. This study aims to investigate social media data to compare the major topics discussed in the United States and rest of the world and perform a sentiment analysis to see if the comments are positive, negative, or neutral. Twitter was the primary source of information that was used in this thesis, as it is a place where people interact, create, and share information and ideas online. In …

Beyond Health And Animal Rights: A Study In Black Veganism, Wendy J. Rib

USF Tampa Graduate Theses and Dissertations

Veganism, or the avoidance of animal products, has been recognized by nutritionists and food scientists as a lifestyle choice associated with good health and lower prevalence of diabetes, obesity, hypertension, and heart disease. However, the choice to eschew all animal products is frequently more than just a diet. Many people practice veganism as part of a larger reformative social movement, seeking permanent change in food structures, advancing policies in animal welfare and transforming their everyday lives in the quest for cultural acceptance. Although the number of people who identify as vegans appears to be growing, it is often assumed that …

Health Effects Of Oil Spills And Dispersal Of Oil Droplets And Zooplankton By Langmuir Cells, Sanjib Gurung

USF Tampa Graduate Theses and Dissertations

This Ph.D. dissertation deals with the study of the health effects of crude oil vapors from oil spills, the effect of Langmuir circulation on the dispersion of oil droplets during oil spill events, and the biological significance of Langmuir circulation. The introduction to areas of three major research projects undertaken during my Ph.D. is included in chapter 1 and the relevant literature review is included in chapter 2. The first research project described in chapter 3 involves the quantification of health effects on embryonic Gulf killifish due to exposure to crude oil vapors. The second research project described in chapter …

African American Males' Perception Of Factors That Contribute To Success In Higher Education, Gary D. Oliver

USF Tampa Graduate Theses and Dissertations

Over the past decades, many studies have concluded that African American students' college completion rate and success lag far behind other students attending college in the United States (The JBHE Foundation, Inc., 2006). More specifically, these studies have confirmed that African American male students' success rates remain disproportionally low compared to other ethnic male groups. Unfortunately, few notable studies identifying African American males achieving higher education or completing their academic pursuits have been presented as part of the Black male student narrative.

This study aimed to understand better the resources and experiences that positively affect African American males who completed …

Coarse-Grained Modeling Studies Of Entangled Semiflexible Polymers: Melts, Glasses, And Granular Media, Joseph Fox D. Dietz

USF Tampa Graduate Theses and Dissertations

This dissertation is devoted to the computational study of model semiflexible polymers using a coarse-grained bead-spring approach and molecular dynamics (MD) simulations. Much of the work presented here is motivated by the need to derive predictive models for describing polymeric materials’ macroscopic mechanical response from the underlying local structure or local chain parameters. This dissertation describes polymeric materials in the context of granular media, melts, and glasses with a focus on relating characteristics such as chain stiffness and local structure to systems’ solidification, rheology, and fracture mechanisms.

Chain stiffness κ and structural properties like chains’ characteristic bond angle θ0 are …

Using Online Reviews To Identify How Hotels Can Satisfy Travelers With Pets While Making Money, Sonia Weinhaus

USF Tampa Graduate Theses and Dissertations

A Qualitative Content Analysis of user generated content in the form of online reviews reveals an opportunity for hotels to better serve Travelers With Pets and collect partitioned fees. Examining more than 3,000 reviews of 92 hotels from five geographical regions of the United States identifies how to close the gap between what customers want and what hotels offer. This study derives the Minimum and Maximum Typologies of pet policy structures from the coding of online reviews. Travelers With Pets are willing to pay partitioned fees if the fee is viewed as fair. Improving saliency of pet fees is revenue …

Reviving The Christian Left: A Thematic Analysis Of Progressive Christian Identity In American Politics, Adam Blake Arledge

USF Tampa Graduate Theses and Dissertations

While Christianity in American politics today is mostly dominated by the voice of the Religious Right, many are unaware that there also exists a significant number of progressive Christians throughout the country. This diverse group, often referred to as the Christian Left, is not as organized or outspoken as conservative Christians and tends to shy away from the restrictive influence of identity labels. However, members all share in common a passion for social justice issues. This study aims to gain a deeper understanding of the identity of Christian Left individuals through a thematic analysis of interviews. By interrogating participants’ identity …

Communicating Breast Cancer Awareness: Using The Health Belief Model To Develop Mass Communication Themes To Influence Early Detection Behaviors, Srisai Kamakshi Ramya Harika Pucha

USF Tampa Graduate Theses and Dissertations

Breast cancer (BC) is the most fatal cancer in India and has affected more than 1.3 million people in the year 2020 alone, making it a national public health priority. The reason for this alarming increase in BC incidences and mortality rates stems from a severe lack of awareness and the absence of targeted interventions. Considering the absence of a national level breast cancer awareness program, the following study sought to understand Indian women’s preconceived notions about the disease and the available screening methods to contribute to future mass communication campaigns in India. The study used a pre-designed interview guide …

To Be Or Not To Be: A Tale Of Staphylococcal Gpsb, Lauren R. Hammond

USF Tampa Graduate Theses and Dissertations

There are two big drivers motivating studies into bacterial cell division. The first is a desire to understand life around us. One of the defining characteristics of life is the ability for a cell to grow and divide, and without in-depth knowledge of this process, we cannot truly understand the complexities that allow for life on this planet. The second motivator is to identify new drug targets in the ongoing fight against antimicrobial resistance. Many infectious organisms have become resistant to commonly used antibiotics, and the bacterial cell division machinery is a largely untapped essential process with many potential therapeutic …

Lord Of The Z-Rings: Uncovering The Role Of Mraz And Ftsl In Bacillus Subtilis Cell Division, Maria Louise White

USF Tampa Graduate Theses and Dissertations

Cell division is a complex and highly orchestrated process that requires careful coordination. The process of cell division in prokaryotes primarily occurs via binary fission, where one mother cell becomes two genetically identically and equally sized daughter cells. In most bacteria a key protein, FtsZ, forms a FtsZ ring (Z-ring) to mark the division site and recruit proteins involved in cytokinesis. Whilst much has been learned about the contents and assembly of the divisome in model organisms such as Escherichia coli and Bacillus subtilis factors governing the regulation of divisome are much more poorly understood. …

The Weekly Challenger, October 27, 2022, The Weekly Challenger, Et Al

Weekly Challenger Newspaper Collection

The October 27, 2022, issue of The Weekly Challenger.

Ec Expression Of Activated K-Ras Leads To Capillary Deficiency Due To Excessive Lumen Formation, Reduced Pericyte Recruitment, And An Increased Susceptibility To Mmp-1-Dependent Vascular Regression, Zheying Sun

USF Tampa Graduate Theses and Dissertations

Activated k-Ras mutations play a role in a variety of pathological conditions, such as arteriovenous malformations (AVMs). To study the effect of activated k-Ras mutation on lumen formation, we engineered human ECs to simultaneously express the activated k-Ras (G12V) mutation and compared their ability to form lumens with control ECs. We demonstrated that ECs with k-RasV12 lead to marked stimulation of EC lumen formation due to dramatic increases in intracellular vacuole formation and fusion, signaling changes including accelerated Src kinase activation, and MT1-MMP-dependent lumen expansion, all of which drive the process of lumen formation. The markedly accentuated lumen formation is …

Identifying Significant Factors Affecting The Likelihood And Severity Level Of Shared E-Scooter Crashes, Recep Can Cakici

USF Tampa Graduate Theses and Dissertations

• Objective: To identify significant factors that affect the possibility of shared e-scooter related crashes in Tampa and St. Petersburg, FL, and also to capture determinants contributing to the level of injury of shared e-scooter related crashes in Tampa, FL.
• Background: Over the past few years, shared e-scooters have become a common form of micromobility; however, safety concerns have been raised due to the increased number of injury accidents involving e-scooters.
• Data and data sources: Survey questionnaires were designed to collect data from the general public on e-scooter sharing programs in Tampa and St. Petersburg, FL. The collected data include respondents’ …

Evaluation Of Response Modality In Online Discussion Boards, Tatiyanna A. Dunn

USF Tampa Graduate Theses and Dissertations

Since 2020, over 3 million students have enrolled in a postsecondary distance learning course (National Center for Education Statistics, 2020). One challenge in distant learning is fostering student engagement. Student engagement is a broad construct that refers to increasing contact between three pillars of education. Students, teachers, and course material. Past research has shown increasing engagement leads to improved student performance and instructor evaluations. Unsurprisingly, promoting student engagement is desirable for both students and instructors (Cobb, 2009). Discussion boards allow student engagement between themselves and Instructors while knowledge can still be tested. Few studies have evaluated the modality of student …

Ambient Athleticism: Politicizing Akira’S Accelerationist Olympiad, Thomas G. Chaplin

USF Tampa Graduate Theses and Dissertations

This thesis politicizes Katsuhiro Otomo’s 1988 animated cyberpunk film, Akira, specifically through how it stages its myriad neoliberal crises as opportunities for accelerationist solutions mediated by the Tokyo Olympics. Akira’s display of fully animated and intense action physics produces an aesthetic relation to its own athletes that contracts around their bodies in an attempt to transgress classical and oppressive compositions. Akira’s vague utopic promise receives broad acceptance and affirmation by extant scholarship, often relying on the accelerative impulses found in the works of Gilles Deleuze to substantiate Akira’s hopeful ending. Invoking Gilles Deleuze’s notion of athleticism, this thesis critically rereads …

5-Aminolevulinate Synthase Inhibitors And Methods Of Use Thereof, Roman Manetsch, Gloria C. Ferreira, Bosko M. Stojanovski, Katya Pavlova Nacheva

USF Patents

Disclosed herein, are 5-Aminolevulinate synthase inhibitors and methods for their use in the treatment of porphyria. In at least one specific embodiment, the 5-Aminolevulinate synthase inhibitors can include compounds or salts thereof of Formulas (I-V)

An Object For Sexual Pleasure: Does Viewing Sexualized Media Predict Increases In Self And Partner Objectification Impacting Feelings Of Sexual And Romantic Closeness?, Kaitlyn Ligman

USF Tampa Graduate Theses and Dissertations

Exposure to sexually objectifying media has been linked to the objectification of the self and of one’s romantic partner (e.g., partner-objectification); yet the implications of this for romantic relationships have remained relatively unexamined. There is, however, reason to suspect that exposure to sexually objectifying media and engaging in objectification may have implications for romantic couples. When a woman frequently monitors her appearance this may undermine her ability to sexually connect with her partner and when a man views his partner as an object for sexual pleasure it may impede his ability to develop intimate feelings of relational closeness to his …

Organizing For Here And There: Exploring The Grassroots Organizing Of The Puerto Rican Diaspora In The Tampa Bay Area, Dominique Rivera

USF Tampa Graduate Theses and Dissertations

Drawing upon participant observations and semi-structure interviews with 10 Puerto Rican grassroots organizers from the Tampa Bay area of Florida, this project examines the processes by which Puerto Rican diaspora members build, maintain, and utilize social and symbolic ties as resources for organizing and executing grassroot projects and campaigns with a dual focus on the Puerto Rican community in the Tampa Bay area and in Puerto Rico. Complex webs of interlocking social and symbolic ties that transcend region of origin and regions of destination constitute a transnational social field, within which exchanges of ideas, practices, and resources are organized among …

Social Media Time Series Forecasting And User-Level Activity Prediction With Gradient Boosting, Deep Learning, And Data Augmentation, Fred Mubang

USF Tampa Graduate Theses and Dissertations

In the overall history of technological innovations, social media has only existed for a brief time, however its influence is undeniable. Researchers have found that it can be used to influence elections, spread health misinformation, and aid with financial pump-and-dump schemes. Keeping all this in mind, it is clear that more research is needed to predict the spread of information on social media in order to combat its malicious use.

To that end, in this dissertation, we explore the use of Machine Learning algorithms to perform time series forecasting and user-level activity prediction in social media. We address the different …