Digital Commons Network^™

Large Area Projection Sintering Of Semicrystalline Polymers And Part Analysis Of The Printed Specimens, Taranjot Kaur

USF Tampa Graduate Theses and Dissertations

As the requirements posed to products have increased in recent years. The trend towards individualized serial products steps up the need for respective manufacturing techniques to be more and more flexible. Conventional techniques of serial production, such as injection molding, are unable to fully meet the requirements of this trend. Additive manufacturing techniques generate components directly from a CAD data set while requiring no specific mold, producing minimal waste, and reaching satisfactory geometric accuracy. This is how, as opposed to conventional techniques, they comply with these increased demands to processing technology. Over the last two decades, the research community has …

Examining The Social Validity Of Parent Training: Post-Participation Parent Perceptions And Reflections Of Group Triple P, Nycole C. Kauk

USF Tampa Graduate Theses and Dissertations

Child behavior problems are highly prevalent and impactful on the child and their family system, bringing both short-term and long-term consequences (Sanders, 2012). Many risk factors for child behavior problems are modifiable via the use of Behavioral Family Interventions, such as behavioral parent training programs (Kazdin, 1991). Behavioral Family Interventions (BFI) modify factors within the family system to minimize modifiable risk factors and engineer protective factors to produce behavior change (Kazdin, 1991). While several manualized behavioral parenting interventions exist, the Triple P parenting program is one of the most researched and effective programs used internationally, particularly the Level 4 package; …

Aqueous Humor Dynamics And Compound Action Potentials In The Anesthetized And Conscious Freely Moving Rat, Youssef Mohamed

USF Tampa Graduate Theses and Dissertations

Vision is dependent on the proper functioning of many intricate components of the eye. Aqueous humor dynamics function to keep the eye inflated at the right pressures and nourish avascular tissue in the eye while properties of the corneoscleral shell dictate how dynamic changes in volume and pressure affect tissue at the optic nerve head. Retinal ganglion cells exit the globe at the optic nerve head and carry all of the visual information to the brain for perception of visual stimulus. In this dissertation, we aim to present a lumped parameter model of the eye that can accurately describe the …

A Protein-Based Therapeutic Combination For The Treatment Of Hard-To-Heal Wounds, Graham L. Strauss

USF Tampa Graduate Theses and Dissertations

Chronic wounds present many clinical challenges in relation to the successful treatment and closure of the damaged tissue. Most current treatment methods focused on one or two aspects to drive wound closure, while most chronic wounds are multifactorial environments with many of those dependencies relying on the termination of one another to effectively gain tissue construction, closure, and full skin thickness and composition. Natural wound healing processes allude to potential biologics that can impede the chronic breakdown of tissue, while restoring deposition of new tissue, and effectively leading to a healed wound. Proteases secreted by the body’s immune system lay …

First-Generation Female Doctoral Students’ Perceptions Of The Doctoral Experience, Nancy Carol Carr

USF Tampa Graduate Theses and Dissertations

The purpose of my study was to understand the perceptions of first-generation female doctoral students (FGFDS) and what factors may impact first-generation female doctoral students’ completion of their doctoral program. As the researcher, I collected data through: (a) interviews, (b) participant generated photographs, (c) the group meeting, and (d) the researcher’s personal reflexive journal. Two research questions guided this exploratory qualitative study: In what ways do first-generation female doctoral students in the College of Education perceive their experiences impact their progress during their doctoral program at a large research university in Central Florida?; and what factors do first-generation female doctoral …

Modified Biosand Filtration Using Aluminum Hydroxide Filter Media To Enhance Fluoride Removal, Joshelyn Guimaray

USF Tampa Graduate Theses and Dissertations

There are over 20 countries whose citizens consume groundwater containing high levels of fluoride, including Nigeria, Mexico, India, China, and Ghana, which all have major health crises when it comes to the safety of their drinking water. Minerals like fluorite contain fluoride which is often found in groundwater aquifers. The minerals release fluoride into the groundwater. Per the World Health Organization (WHO) standard, the maximum contaminant limit for fluoride consumption should be less than 1.5 mg/L. Chronic exposure of elevated levels of fluoride can cause people to suffer debilitating health effects, such as dental and skeletal fluorosis. Dental fluorosis causes …

Mm-Wave Reconfigurable Antenna Arrays, Phase Shifters And Beamforming Networks With Reduced Hardware Complexity Using Integrated Microfluidic Actuation, Jonas J. Mendoza Sandoval

USF Tampa Graduate Theses and Dissertations

Microfluidically reconfigurable radio-frequency (RF) devices, in general, are found attractive for low-loss, wide-frequency tunability, low hardware complexity, and high-power-handling capabilities. More recently, microfluidic actuation has also been proposed as an alternative to semiconductors and micro-electromechanical systems-based approaches to realize new and compact reconfigurable devices operating in mm-Wave bands. This research expands the knowledge base on low-loss and compact mm-Wave reconfigurable devices. The reconfiguration approach relies on utilizing a microfluidically actuated selectively metalized plate (SMP) within proximity of the RF device to alleviate the practical issues arising from the traditional usage of liquid metals in microfluidically reconfigurable devices.

The first novel …

Florida Punks: Punk, Performance, And Community At Gainesville’S Fest, Michael Anthony Mcdowell Ii

USF Tampa Graduate Theses and Dissertations

Fest is an annual punk rock music festival held in Gainesville, Florida. At Fest, participants engage in aesthetic creation and participation, negotiate identities, participate in political discourse, and forge communities. In this dissertation, I use theories of performance, framing, and culture to understand Fest. To do so, I theorize Fest using three approaches to performance: performance as an object of study, performance as a metaphor for everyday life and identity, and performance as a method of inquiry. Using these three approaches to performance, I understand Fest as performance, as a site that permits and constrains performances of self, identity, and …

A Convergent Approach To Aqueous Lead (Pb) Mitigation Of A Supplemental Self-Supply Shallow Groundwater Source Accessed By Handpumps In Madagascar, Adaline Marie Buerck

USF Tampa Graduate Theses and Dissertations

The World Health Organization (WHO) has consistently listed lead (Pb) as one of the ten chemicals of major public health concern. Though the toxic nature of lead has been known since the 20th century it is still utilized in a wide variety of products due to its favorable properties. Exposure to lead still accounts for approximately 900,000 deaths annually and disproportionately impacts those in low- and middle-income countries (LMIC) due to a variety of reasons such as poverty, malnutrition, and lack of knowledge on the toxic nature of lead. Lead exposure routes include air, soil, dust, diet, and water. Though …

English Language Learners’ Perceptions Of Employing A Social Annotation Tool To Promote Peer Support, Engagement With The Text, And Reading Comprehension, Inanc Karagoz

USF Tampa Graduate Theses and Dissertations

International students in English-medium higher-education programs read various texts from different fields in English throughout their studies. Many students find reading for academic purposes less enjoyable which, in turn, has a negative effect on their engagement and reading comprehension. Collaboration through social annotation tools may transform the process of meaning-making into a social activity. The extant literature focuses on its impact on comprehension and learners’ attitudes. To add to the literature and understand remote learners’ experiences, I explored international students’ perceptions of employing a social annotation tool on promoting their peer interactions, reading engagement, and comprehension in a hybrid EAP …

An Integrated Approach For Dynamic Process Modeling And Optimization Of Wastewater Treatment Facilities, Komal Rathore

USF Tampa Graduate Theses and Dissertations

The subareas of process systems engineering including process modeling, simulation, and optimization are becoming progressively substantial for understanding processes, making decisions, improving efficiency, and complying with stricter environmental and safety legislation. Additionally, the availability of user-friendly flowsheet simulators and computational resources with the current trend of data collection and analysis has allowed for a more accurate representation of complex processes such as wastewater treatment systems. Despite all the progress in the areas of process modeling and simulation, the first-principle mechanistic models for wastewater treatment processes are at best employed during the design stage, and therefore, not used optimally for day-to-day …

Passive Radiative Cooling By Spectrally Selective Nanoparticles In Thick Film Nanocomposites, David Allen Young

USF Tampa Graduate Theses and Dissertations

Passive cooling of buildings is a benefit to society since no energy input is required for space cooling which reduces electricity consumption, fossil fuel burning, and greenhouse gas emissions. When a passive cooling technology radiates heat from the earth through the atmospheric windows to space higher levels of cooling power are possible -- this phenomenon is classified as passive “radiative” cooling. Spectrally selective surface coatings provide radiative cooling to lower surface temperatures by reflecting most solar radiation, while emitting infrared radiation at wavelengths between 8-13 μm through the primary atmospheric window to the cold of space. Multiple applications of radiative …

Explainable And Cooperative Autonomy Across Networks Of Distributed Systems, Peter Joseph Jorgensen

USF Tampa Graduate Theses and Dissertations

Large networks of complex systems-of-systems are commonplace and evermore present in both mundane and extraordinary facets of human existence. From the exponential growth of connectivity via the internet and other information networks, to the miniaturization of computers and sensors, to cross-domain sensor and communication networks, these networks of distributed systems-of-systems (NDSS) present incredible benefits and challenges. Autonomy is perhaps the most important and most difficult to achieve enabling technology for efficient performance of the NDSS. Giving each individual agent in a network the ability to manage its internal state in dynamic operating environments and in pursuit of multiple complex and …

Nanophotonics And Nanomaterials For Microbial Inactivation, Sharad Ambardar

USF Tampa Graduate Theses and Dissertations

The study of light-matter interaction at nanoscale, also termed as nanophotonics, has gained vast attention due to its multidisciplinary application in the field of chemical engineering for the synthesis of nanomaterials, in the field of physics to study non-linear optical processes and optical phenomena in nanocavities and in the field of biology, biomedicine to study and develop novel optical nanoprobes for diagnostics, nanobiosensing and near-field imaging.

We studied UV-irradiation-based inactivation of SARS-CoV-2 and other respiratory viruses. In this work, we fabricated a device comprising a pulsed nanosecond 266 nm UV laser coupled to an integrating cavity (LIC), composed of a …

Multiple Solar Receivers Arrangement For High-Temperature Power Generation And Applications, Diego Jesus Guillen Perez

USF Tampa Graduate Theses and Dissertations

This dissertation presents an investigation of the specification and operation of multiple central solar receivers (CSR) sharing a heliostat field and an analysis of the receiver's thermal performance. A heliostat field was modeled in which different parts of the field aimed at different external or cavity receivers located on the same tower. Optical and thermal performance are analyzed, including the receivers' heat flux, solar thermal efficiency, and annual energy output. Some of the contributions of this research are:

1. Propose a novel configuration for a CSP power generation system using two receivers in a single central tower suitable …

Development And Analysis Of Green Pathways For Biphasic Extraction At High Pressure, Kyle L. Cogswell

USF Tampa Graduate Theses and Dissertations

Technological advancements over the last century have allowed for advancements not only in science and engineering but medicine as well. The use of supercritical fluids for processing continues today after its initial boom in the latter part of the last century; often being paired with co-solvents to extend the range of use for this technique. Supercritical fluid extraction may be paired with pressurized warm water extraction to yield a new intensified process for biphasic extractions that improves efficiency and reduces waste. This combination may be used to replace sequential extraction processes or supercritical extraction processes that make use of organic …

Fragmentation Of Chemically Herded Oil Slicks By Obstacles: Visualizations, Flow Measurements, And Spatial Distributions, Ali Alshamrani

USF Tampa Graduate Theses and Dissertations

Chemical herders are a promising technique for treatment of oil spills in icy waters at high latitudes. However, obstacles on the water surface such as floating ice affects or interferes with all spill response countermeasures including chemical herder operations by fracturing the contracting oil slick and trapping small oil patches. Chemical herders are likely to be especially useful in containing oil spills in remote, ice-infested Arctic waters, where using booms to contain an oil slick is difficult. Much of the previous research into chemical herder has focused on the effectiveness of different types of chemical herder agents to thicken oil …

A Descriptive Exploratory Case Study Of University Of Central Riyadh Collaboration With Public Schools In Preparing Teachers, Arwa Alazwari

USF Tampa Graduate Theses and Dissertations

The purpose of this descriptive exploratory case study is to explore the collaboration between the University of Central Riyadh (UCR) (pseudonym) teacher preparation program and public schools in preparing teachers. This study was framed using the theory of social constructivism. Qualitative methodology was used to collect data by using semi-structured interviews with three university supervisors (USs), three cooperating teachers (CTs), and three preservice teachers (PSTs). All the participants were from the curriculum and instructor department at UCR. The qualitative data were thematically analyzed using NVivo software. This study found that UCR and public schools collaboration was one-directional, meaning the collaboration …

Evaluation Of Aluminum Dissolution, Current Density, And Pitting Patterns During Electrocoagulation, Monica Castro Carias

USF Tampa Graduate Theses and Dissertations

Electrocoagulation (EC) is a sustainable water treatment process involving the generation of coagulants on-site through the application of a voltage on metal (usually aluminum or iron alloys). The factors that impact EC system performance have been well researched, however further research is needed on the factors that impact anodic dissolution of aluminum electrodes, especially when the technology is transferred to full-scale applications. Electrode fouling is one of the factors that can impact dissolution of the anode during EC due to the formation of a protective oxide/hydroxide layer on the electrode surface. Previous studies have addressed electrode fouling by reversing polarity, …

The Tesla Brake Failure Protestor Scandal: A Case Study Of Situational Crisis Communication Theory On Chinese Media, Jiajun Liu

USF Tampa Graduate Theses and Dissertations

The aim of this thesis is to test how Tesla handles a protestor in Tesla’s booth in Shanghai. This thesis evaluated the effectiveness and acceptance of Tesla’s public relations and crisis communication through analyzing domestic Chinese official news articles and consumers’ attitude on China’s most used social media platform, Weibo. The electric vehicle industry is relatively a newer industry than traditional automobile manufacturing industries. Therefore, the immaturity of the industry could bring different types of crises, and traditional vehicle problems could also be the problems of electric vehicles, such as engine failure, brake failure, safety concerns and security threats, and …

Improved Performance Of Silica-Supported La0.5Ba0.5Feo3 In The Reverse Water Gas Shift - Chemical Looping Process For Carbon Dioxide Reduction – A Density Functional Theory Study, Jiawei Guo

USF Tampa Graduate Theses and Dissertations

Global warming is increasingly obvious, and the reduction of greenhouse gases is an effective way to heal. Increasing the efficiency of catalysts that is applied in the industry can significantly reduce the emission of greenhouse gases. Reverse water gas shift chemical looping (RWGS-CL) is a promising reaction to convert CO2 to CO. La0.5Ba0.5FeO3 (LBF) is a good candidate for RWGS-CL, which shows increased conversion yield when supported on silica. This research focuses on identifying the mechanism of RWGS-CL via silica-supported LBF by exploring the oxygen vacancy formation energy (EO-vac). Density Functional Theory (DFT) is a powerful computational method to solve …

Degradation Performance Modeling And Optimal Maintenance Planning Of Deteriorating Critical Infrastructures, Hung Q. Nguyen

USF Tampa Graduate Theses and Dissertations

Serving as the backbone of the nation’s economy, a large and growing number of deteriorating critical infrastructures, such as transportation and water infrastructures, are underperforming, aging, becoming structurally deficient, and must be repaired or replaced. Due to the influence of a variety of factors (e.g., material structure, design, operation, and environmental conditions) at different phases of lifecycle and the costly data acquisition process, field degradation of deteriorating infrastructures is highly uncertain with limited degradation data. The co-location and spatial proximity between many infrastructures, such as road and water infrastructures, further makes them physically and operationally interdependent. The sheer deterioration of …

Simulating Flood Control In Progress Village, Florida Using Storm Water Management Model (Swmm), Azize Minaz

USF Tampa Graduate Theses and Dissertations

Flooding is a natural event caused by heavy rains, melting snow, high tides, and anthropogenic impacts such as channel clogging, improper land use, and deforestation. In this study, the strategies for controlling flooding seek to establish flood prevention systems by implementing grey infrastructure and green infrastructure practices. The main objective of this thesis is to analyze the study area, Progress Village Neighborhood in Delaney Creek Watershed, regarding flood risk and flood mitigation techniques. The analysis was performed using EPA SWMM 5.1 and Arcmap 10.7.1. The study used design storms,10-years 24 hours and 25-years 24 hours, to analyze flood risk in …

Hybrid Rans-Les Hemolytic Power Law Modeling Of The Fda Blood Pump, Joseph Tarriela

USF Tampa Graduate Theses and Dissertations

This study applies the SBES and IDDES hybrid RANS-LES turbulence models along with the K-ω SST model to four flow conditions of the FDA blood pump. Validation of all three turbulence models show good agreement with experimental pressure and velocity fields. Evaluation of turbulent kinetic energy fields for the hybrid models show 80-90+% of kinetic energy is resolved in the rotor and diffuser regions of the pump. Hemolysis power law models were evaluated using the commonly used von Mises stress and additional energy dissipation stress (EDS). Results show viscous and Reynolds stresses computed with the K-ω SST under predict and …

Impedance Analysis Of Anodized Aluminum And Structural Bridge Tendons, Justin Silnutzer

USF Tampa Graduate Theses and Dissertations

This is a two-part thesis with the overall investigation technique being electrochemical impedance spectroscopy (EIS). In the first part, EIS is used to estimate the layer thickness of anodized aluminum oxide. This required the development of an appropriate electrical circuit model; that with parameters that correspond to physical properties of the oxide. In this work, it was found that for thicker oxides of which the outer porous layer is greater than 12 microns, impedance may be used to estimate the outer layer thickness. However, further research is required to understand the role of outer porous layer structure on the impedance …

Computational Methods For Solving The Combinatorial Optimization Problems In Transportation, Xufei Liu

USF Tampa Graduate Theses and Dissertations

This dissertation discusses three transportation problems. The first problem is a bi-level optimization problem that simultaneously optimizes facility locations and network design in hazardous materials transportation. In the upper level, the leader intends to reduce the facility setup cost and the hazmat exposure risk, by choosing facility locations and road segments to close for hazmat transportation. When making such decisions, the leader anticipates the response of the followers who want to minimize the transportation costs. A robust optimization approach with multiplicative uncertain parameters and polyhedral uncertainty sets is applied to deal with the uncertain risk and demand.

The second problem …

Exploration Of Energy Efficient Computing For Data-Intensive Applications, Md Adnan Zaman

USF Tampa Graduate Theses and Dissertations

The recent surge of data-intensive applications has stretched the performance and energy limit of today’s traditional computing system. The massive amount of data generated by data-intensive applications is not processed at the same speed due to bandwidth mismatch between the faster processing unit and slower memory. Memory access and communication bandwidth can be identified as the primary bottlenecks. Consequently, these two bottlenecks make up most of the total energy consumption. In light of this, we explore energy-efficient computing for data-intensive applications. We examine different aspects of two computing systems, such as in-memory computing and AI-enabled edge computing, more popularly known …

Security And Privacy Enhancing Technologies In The Deep Learning Era, Gamage Dumindu Samaraweera

USF Tampa Graduate Theses and Dissertations

Our search queries, online purchase transactions, the videos we watch, and our movie preferences are a few types of information collected and stored daily. This private data collection happens within our mobile devices and computers, on the streets, and in our homes, most of the time even without our consent. Nevertheless, advances in artificial intelligence (AI) in the big data era have increased the capability to capitalize on and benefit from the collection of this private data. Such private data is being used for various machine learning (ML) applications in different domains, such as marketing, insurance, financial services, mobility, social …

A Technique-Based Approach To Structure-From-Motion: Applications To Human-Coastal Environments, Robert Van Alphen

USF Tampa Graduate Theses and Dissertations

Photogrammetry is a method by which physical information can be extracted from thecorrespondence of 2-dimensional images. In the geosciences, Structure-from-Motion (SfM) photogrammetry is a technique that has seen considerable interest in the past decade of research. Here I present three case studies of various scope and methodologies which can inform the use of SfM in the geosciences. First, I discuss the theoretical and algorithmic basis of SfM photogrammetry and its uses thus far in the geosciences. Chapters two through four show specific studies which highlight several approaches to SfM and the data which can be produced. Chapter five then concludes …

New Developments In Statistical Optimal Designs For Physical And Computer Experiments, Damola M. Akinlana

USF Tampa Graduate Theses and Dissertations

Statistical design of experiments allows for multiple factors influencing a process to be systematically manipulated in an experiment, and their effects on the output of the process to be studied via statistical modeling and analysis. Classical designs offer general nice performance but have limited applications due to restricted design size, region, and randomization structure. Computer generated optimal designs become more popular in recent decades due to the rapid growth in computing power. Most existing work in optimal design of experiments involves designing experiments with optimal performance on a single chosen objective or a single response. However, with the increasing limitation …