Digital Commons Network^™

Enhanced Co2 Storage In Confined Geologic Formations, Roland Tenjoh Okwen

USF Tampa Graduate Theses and Dissertations

Many geoscientists endorse Carbon Capture and Storage (CCS) as a potential strategy

for mitigating emissions of greenhouse gases. Deep saline aquifers have been reported to

have larger CO

2 storage capacity than other formation types because of their availability

worldwide and less competitive usage. This work proposes an analytical model for screening

potential CO

2 storage sites and investigates injection strategies that can be employed to

enhance CO

2 storage.

The analytical model provides of estimates CO

2

storage efficiency, formation pressure

profiles, and CO

2

–brine interface location. The results from the analytical model were

compared to those from …

Theoretical And Experimental Study Of Solid State Complex Borohydride Hydrogen Storage Materials, Pabitra Choudhury

USF Tampa Graduate Theses and Dissertations

Materials that are light weight, low cost and have high hydrogen storage capacity are essential for on-board vehicular applications. Some reversible complex hydrides are alanates and amides but they have lower capacity than the DOE target (6.0 wt %) for 2010. High capacity, light weight, reversibility and fast kinetics at lower temperature are the primary desirable aspects for any type of hydrogen storage material. Borohydride complexes as hydrogen storage materials have recently attracted great interest.

Understanding the above parameters for designing efficient complex borohydride materials requires modeling across different length and time scales. A direct method lattice dynamics approach using …

Martian Modules: Design Of A Programmable Martian Settlement, Craig A. Trover

USF Tampa Graduate Theses and Dissertations

The evolution of human beings is marked

by adaptation. The ability to adapt to and

manipulate our environment is one definer of

intelligence, and ours is unique among life

on Earth. Since moving off of the African

Continent, humans have migrated to inhabit

every part of the Earth. Human existence

and perpetuity in the universe depends upon

the success of this adaptation, and inevitably,

migrating off of this planet. The technological

advances being developed today will change

our way of life, and enable people to travel to

and live permanently on the Moon and Mars.

This study involves the architectural …

Motion Analysis Of Fluid Flow In A Spinning Disk Reactor, Valentina N. Korzhova

USF Tampa Graduate Theses and Dissertations

The flow of a liquid film over a rapidly rotating horizontal disk has numerous industrial applications including pharmaceuticals, chemical engineering, bioengineering, etc. The analysis and control of complex fluid flows over a rapidly rotating horizontal disk is an important issue in the experimental fluid mechanics. The spinning disk reactor exploits the benefits of centrifugal force, which produces thin highly sheared films due to radial acceleration. The hydrodynamics of the film results in excellent fluid mixing and high heat or mass transfer rates.

This work focuses on developing a novel approach for fluid flow tracking and analysis. Specifically, the developed algorithm …

Density Functional Theory Studies Of Energetic Materials, Michael W. Conroy

USF Tampa Graduate Theses and Dissertations

First-principles calculations employing density functional theory (DFT) were

performed on the energetic materials PETN, HMX, RDX, nitromethane, and a recently

discovered material, nitrate ester 1 (NEST-1). The aims of the study were to accurately

predict the isothermal equation of state for each material, improve the description of these

molecular crystals in DFT by introducing a correction for dispersion interactions, and

perform uniaxial compressions to investigate physical properties that might contribute to

anisotropic sensitivity.

For each system, hydrostatic-compression simulations were performed. Important

properties calculated from the simulations such as the equilibrium structure, isothermal

equation of state, and bulk moduli were compared …

Sustainable Design Analysis Of Waterjet Cutting Through Exergy/Energy And Lca Analysis, Matthew Johnson

USF Tampa Graduate Theses and Dissertations

A broad scope analysis of waterjet cutting systems has been developed using thermodynamics, life cycle analysis, and biological system comparison. The typical assessments associated with mechanical design include measures for performance and thermodynamic efficiency. Further analysis has been conducted using exergy, which is not typically incorporated into design practices.

Exergy measures the effectiveness of a process with respect to a base state, usually that of the systems surroundings. Comparing Gibbs free energy of biological processes to exergy efficiency has served to illustrate the need for various levels of comparison. Each biological process used in this comparison correlates to a different …

Boundary Profile Representation For Objects And Their Surroundings In Outdoor Videos, Joshua Candamo

USF Tampa Graduate Theses and Dissertations

A novel approach to represent the profile of objects using Gaussian models is presented. The profile is a representation of the object and its surrounding regions. The object profile can be viewed as a comprehensive feature of that object and its surrounding regions. Different algorithms to estimate the profile are described. Geometric descriptors of the model are also proposed. The profile model is empirically shown to be effective and easily applicable to certain object recognition and segmentation tasks. Application experiments include modeling thin and thick objects as straight-lines, curves, and blobs using different primitives such as gray-level intensities, RGB, and …

Autonomous Vertical Autorotation For Unmanned Helicopters, Konstantinos Dalamagkidis

USF Tampa Graduate Theses and Dissertations

Small Unmanned Aircraft Systems (UAS) are considered the stepping stone for the integration of civil unmanned vehicles in the National Airspace System (NAS) because of their low cost and risk. Such systems are aimed at a variety of applications including search and rescue, surveillance, communications, traffic monitoring and inspection of buildings, power lines and bridges. Amidst these systems, small helicopters play an important role because of their capability to hold a position, to maneuver in tight spaces and to take off and land from virtually anywhere. Nevertheless civil adoption of such systems is minimal, mostly because of regulatory problems that …

Enhancing Nature Of Science Understanding, Reflective Judgment, And Argumentation Through Socioscientific Issues, Brendan E. Callahan

USF Tampa Graduate Theses and Dissertations

There is a distinct divide between theory and practice in American science education. Research indicates that a constructivist philosophy, in which students construct their own knowledge, is conductive to learning, while in many cases teachers continue to present science in a more traditional manner. This study sought to explore possible relationships between a socioscientific issues based curriculum and three outcome variables: nature of science understanding, reflective judgment, and argumentation skill. Both quantitative and qualitative methods were used to examine both whole class differences as well as individual differences between the beginning and end of a semester of high school Biology …

College Students' Use Of Science Content During Socioscientific Issues Negotiation: Impact Of Evolution Understanding And Acceptance, Samantha R. Fowler

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to explore the evolution science content used during college students' negotiation of biology-based socioscientific issues (SSI) and examine how it related to students' conceptual understanding and acceptance of biological evolution. Specific research questions were, (1a) what specific evolutionary science content do college students evoke during SSI negotiation, (1b) what is the depth of the evolutionary science content reflected in college students' SSI negotiation, and (2) what is the nature of the interaction between evolution understanding and evolution acceptance as they relate to depth of use of evolution content during SSI negotiation? The Socioscientific Issues …

Crystal Engineering Of Nutraceutical Cocrystals, Dalia A. Aboarayes

USF Tampa Graduate Theses and Dissertations

The work presented herein focus upon crystal engineering of nutraceutical cocrystals. Cocrystals are considered unique solid dosage form which has many advantages over other traditionally known solid forms. Furthermore, cocrystals have proven to improve stability, solubility and bioavailability of Active Pharmaceutical Ingredient (API) as shown in the case of carbamazepine and other APIs in previous studies.

Crystal engineering is commonly used to design new solid forms based on the bases of supramolecular chemistry. In this study, crystal engineering based on intensive Cambridge Structural Database (CSD) analysis used to predict and design new cocrystals of targeted nutraceuticals. Two nutraceuticals were selected …

Development Of A Mangrove Quality Index In Tampa Bay, Florida, Monetta S. Wilson

USF Tampa Graduate Theses and Dissertations

Mangroves are an important resource. They provide a breeding ground for commercially and recreationally important fish, protect shorelines from erosion and improve coastal water quality. Historically, mangroves were undervalued, leading to a loss of 35% of mangroves worldwide and 44% in Tampa Bay due to anthropogenic stressors. Efforts to protect and restore mangroves have led to a variety of management programs. In Tampa Bay the main management program is the Tampa Bay Estuary Program (TBEP). The program has identified the need for simple and easy to use assessment tools to track mangrove quality and aid in mangrove quality. There are …

Physical And Statistical Analysis Of Functional Process Variables For Process Control In Semiconductor Manufacturing, Xi Zhang

USF Tampa Graduate Theses and Dissertations

The research aims at modeling and analyzing the interactions among functional process variables (FPVs) for process control in semiconductor manufacturing. Interaction is a universal phenomenon and different interaction patterns among system components might characterize the system conditions. To monitor and control the system, process variables are normally collected for observation which could vary with time and present in a functional form. These FPVs interact with each other and contain rich information regarding the process conditions. As an example in one of the semiconductor manufacturing processes, changes of interactions among FPVs like temperature and coefficient of friction (COF) might characterize different …

Environmental Remediation Of Tnt Using Nanoscale Zero-Valent Iron Metal, Erica Echols

USF Tampa Graduate Theses and Dissertations

This research focused on the use of nanoscale zero-valent iron (NZVI) to remediate trinitrotoluene (TNT). Zero-valent iron has demonstrated effective degradation of TNT, however, these particles themselves have significant problems in treating sorbed phase TNT in the aerobic environment. This research was comprised of four areas: degradation studies of neat nano-iron with aqueous TNT, degradation studies of nanoiron emulsion with aqueous TNT, characterization of TNT in Vieques, Puerto Rico sediment, and Solid Phase Microextraction (SPME) technique interface with HPLC. Both neat and emulsion NZVI studies showed TNT degradation. More degradation was seen in studies using fresher iron. The results from …

Integrating Rural Cambodian Villagers’ Perspectives Into Monitoring And Evaluation Protocols For An Ngo’S Water And Sanitation Program, Elizabeth Churchill

USF Tampa Graduate Theses and Dissertations

Bridges Across Borders (BAB), a non-governmental organization (NGO) in Cambodia, directs diverse and complementary projects to improve the lives of Cambodians living in poverty. The Hand In Hand project (HIH) is one of these projects, implemented in the rural community of Chamcar Bei. This project started in 2006 and is designed to be completely sustained by the villagers after 5 years. One of the four components of HIH is a health component, whose goal is to improve the health of the community. In 2007 and 2008, through these health initiatives, BAB provided the community with 280 ceramic water filters, 20 …

Speech Recognition Software For Language Learning: Toward An Evaluation Of Validity And Student Perceptions, Deborah Cordier

USF Tampa Graduate Theses and Dissertations

A renewed focus on foreign language (FL) learning and speech for communication has resulted in computer-assisted language learning (CALL) software developed with Automatic Speech Recognition (ASR). ASR features for FL pronunciation (Lafford, 2004) are functional components of CALL designs used for FL teaching and learning. The ASR features available with the TeLL me More French software provides pronunciation, intonation and speaking practice and feedback. ASR features are examined quantitatively through French student performance of recorded ASR-scored speech and compared with human raters of the same produced speech samples. A comparison of ASR scores to human raters considers the validity of …

Improving Ad-Hoc Team Performance Using Video Games, Jeff David Craighead

USF Tampa Graduate Theses and Dissertations

This dissertation examined the effects of distributed, multiplayer training video games on the performance of distributed teams of robot operators. Two hypotheses were tested, the first hypothesis stated that online, game-based team training will improve the performance of an ad-hoc team versus an ad-hoc team formed of individually trained teammates. The second hypothesis stated that the fractal dimension of a robot's path can be used as an indicator of its operator's skill. Forty-one volunteers participated in an experiment in which they played a distributed, online training game which showed them the basics of operating an Inuktun Extreme VGTV for a …

Thiomicrospira Crunogena: A Chemoautotroph With A Carbon Concentrating Mechanism, Kimberly P. Dobrinski

USF Tampa Graduate Theses and Dissertations

Gammaproteobacterium Thiomicrospira crunogena thrives at deep-sea vents despite extreme oscillations in the environmental supply of dissolved inorganic carbon (DIC; =CO₂ + HCO₃^- + _CO3^-2). Survival in this habitat is likely aided by the presence of a carbon concentrating mechanism (CCM). Though CCMs are well-documented in cyanobacteria, based on this study T. crunogena is the first chemolithoautotroph to have a physiologically characterized CCM. T. crunogena is capable of rapid growth in the presence of 20 micrometers DIC, has the ability to use both extracellular HCO₃^- and CO₂, and generates intracellular DIC concentrations …

Removing Arsenic From Landfill Leachate In Batch Reactors With Kemiron Adsorbent, A Commercially Available Iron Oxide, Douglas Oti

USF Tampa Graduate Theses and Dissertations

This research evaluated the effectiveness of a commercially available adsorbent, Kemiron, to remove arsenic from conditions representative of landfill leachate. Kemiron was identified as an iron oxide of 39.8 m

^{2/g surface area, 44 % of which resided in the less than 3 nm pore size range. Batch experiments of As(V) and As(III) were conducted with particle sizes either ≤38 μm and in the range 500 – 600 μm with equilibrium being reached in the smaller particles in ~ 36 hours and estimated at 374 hrs for the larger particles. Ionic strength did not affect the mass loadings of As(V) …}

Glycosylation Modulates Cardiac Excitability By Altering Voltage-Gated Potassium Currents, Tara A. Schwetz

USF Tampa Graduate Theses and Dissertations

Neuronal, cardiac, and skeletal muscle electrical signaling is achieved through the highly regulated activity of several types of voltage-gated ion channels to produce an action potential (AP). Voltage-gated potassium (K_v) channels are responsible for repolarization of the AP. K_v channels are uniquely and heavily glycosylated proteins. Previous reports indicate glycosylation modulates gating of some K_v channel isoforms; often, terminal sialic acid residues alter K_v channel gating. Here, we questioned whether alterations in glycosylation impact K_v channel gating, thus altering APs and cardiac excitability. ST3Gal-IV, a sialyltransferase expressed at uniform levels throughout the heart, adds …

Establishing Creative Writing Studies As An Academic Discipline, Dianne J. Donnelly

USF Tampa Graduate Theses and Dissertations

The discipline of creative writing is charged "as the most untheorized, and in that respect, anachronistic area in the entire constellation of English studies (Haake What Our Speech Disrupts 49). We need only look at its historical precedents to understand these intimations. It is a discipline which is unaware of the histories that informs its practice. It relies on the tradition of the workshop model as its signature pedagogy, and it is part of a fractured community signaled by its long history of subordination to literary studies, its lack of status and sustaining lore, and its own resistance to reform. …

Gulliver’S Travels To The Screen, Giant And Tiny, Mark Dekle

USF Tampa Graduate Theses and Dissertations

Gulliver's Travels, by Jonathan Swift, has captured readers' imaginations for almost three hundred years, spawning countless adaptations over several different mediums. As different means of communicating and transforming art have been invented, these adaptations have grown to fill the new mediums and make use of the various possibilities each form has created. Film in particular has created an enormous opportunity to re-imagine Gulliver's Travels, since it can directly show the audience the fictional foreign locations in which Gulliver finds himself.

In this study, I examine seven screen adaptations of Swift's novel to determine what our current culture views as …

Power-Performance Tradeoffs In Database Systems, Zichen Xu

USF Tampa Graduate Theses and Dissertations

With the total energy consumption of computing systems increasing at a steep rate, much attention had been paid to the design of energy-efficient computing systems and applications. So far, database system design has focused on improving the performance of query processing. The objective of this study is to explore the potential of energy conservation in relational database management systems. The hypothesis is: by modifying the query optimizer in a Database management system (DBMS) to take the energy cost of query plans into consideration, we will be able to reduce the energy usage of database servers and control the tradeoffs between …

The Biomechanics Of Reverse Shoulder Arthroplasty, Sergio Gutiérrez

USF Tampa Graduate Theses and Dissertations

Rotator cuff deficiency with glenohumeral arthritis presents a unique challenge to the orthopaedic surgeon. Under these conditions, total shoulder replacement has yielded poor results as a result of eccentric loading of the glenoid leading to loosening and early failure. Multiple procedures have been recommended to resolve this problem including total shoulder arthroplasty, shoulder arthrodesis, and hemiarthroplasty. Hemiarthroplasty, the current standard of care for this condition, offers only limited goals for functional improvement and only a modest improvement in pain.

Recently, there has been renewed interest in reverse shoulder arthroplasty. The main concept behind the reverse shoulder implant is the stabilization …

Opportunities For Nutrient Recovery From Post-Digestion Sludge Handling: Analysis And Feasibility Study Using Municipal Scale Aerobic And Anaerobic Digesters, David Starman

USF Tampa Graduate Theses and Dissertations

The wastewater treatment process has developed with the primary goals of protecting receiving water ecosystems and human health. Over time, there have been continuous innovations in process efficiencies, energy recovery, and nutrient removal. Wastewater offers opportunity for recovery of resources of various economic values, and recent research aims at process innovation to optimize resource recovery while still achieving the primary goals of the treatment process. The objective of this study is to assess the logistical and economic feasibility of recovery of nitrogen and phosphorus at two municipal treatment plants in the Tampa Bay area, one employing aerobic digestion and the …

Sequential Afterglow Processing And Non-Contact Corona-Kelvin Metrology Of 4h-Sic, Eugene L. Short Iii

USF Tampa Graduate Theses and Dissertations

Silicon carbide (SiC) is a wide band-gap semiconductor with advantageous electrical and thermal properties making it attractive for high temperature and power applications. However, difficulties with oxide/SiC structures have posed challenges to the development of practical MOS-type devices. Surface conditioning and oxidation of 4H-SiC were investigated using a novel sequential afterglow processing approach combined with the unique capabilities of non-contact corona-Kelvin metrology. The use of remote plasma assisted thermal oxidation facilitated film growth at low temperature and pressure with the flexibility of sequential in-situ processing options including pre-oxidation surface conditioning. Corona-Kelvin metrology (C-KM) provided a fast, non-destructive method for electrical …

An Inconsistency-Based Approach For Sensing Assessment In Unknown Environments, Jennifer Diane Gage

USF Tampa Graduate Theses and Dissertations

While exploring an unknown environment, an intelligent agent has only its sensors to guide its actions. Each sensor's ability to provide accurate information depends on the environment's characteristics. If the agent does not know these characteristics, how can it determine which sensors to rely on? This problem is exacerbated by sensing anomalies: cases where sensor(s) are working but the readings lead to an incorrect interpretation of the environment, e.g. laser sensors cannot detect glass. This work addresses the following research question: Can an inconsistency-based sensing accuracy indicator, which relies solely on fused sensor readings, be used to detect and …

Evaluation Of Advanced Materials To Protect Against Fall-Related Head Injuries, Michael V. Kerrigan

USF Tampa Graduate Theses and Dissertations

Falls among the elderly population continue to be a growing concern in the healthcare industry and are marked by staggeringly high social and economic costs. The incidence of falls is known to increase with age, and currently the elderly population is growing at an astounding rate as baby-boomers are now entering this age group. Also, recovery following fall-related injuries decreases with increased age. These confounding factors currently make falls a very important area of research. Of the injuries typically seen in falls among the elderly, head injuries are one of the most debilitating. Death due to head trauma among the …

Software Automation For Measurement-Based Behavioral Models Of Microwave, Daniel Sosa Martin

USF Tampa Graduate Theses and Dissertations

This thesis presents a study and implementation of several measurement procedures used to efficiently generate non-linear measurement-based behavioral models primary for microwave amplifiers. Behavioral models are a solution for representing devices that can present linear and/or non-linear behavior when little or no information about the internal structure is known. Measurement-based behavioral models are an advantage since they can be extracted from a direct measurement of the device. This work addresses some of the challenges of these types of measurements. A set of software modules has been produced that combine several modern techniques to efficiently generate practical models using equipment commonly …

Robots Without Faces: Non-Verbal Social Human-Robot Interaction, Cindy L. Bethel

USF Tampa Graduate Theses and Dissertations

Non-facial and non-verbal methods of affective expression are essential for naturalistic social interaction in robots that are designed to be functional and lack expressive faces (appearance-constrained)such as those used in search and rescue, law enforcement, and military applications. This research identifies five main methods of non-facial and non-verbal affective expression (body movement, posture, orientation, color, and sound). From the psychology, computer science, and robotics literature a set of prescriptive recommendations was distilled for the appropriate non-facial and non-verbal affective expression methods for each of three proximity zones of interest(intimate: contact - 0.46 m, personal: 0.46 - 1.22 m, and social: …