Digital Commons Network^™

Tracing Anthropogenic Wastes: Detection Of Fluorescent Optical Brighteners In A Gradient Of Natural Organic Matter Fluorescence, Laura Kellie Dixon

USF Tampa Graduate Theses and Dissertations

A dual wavelength method was developed for the field detection of optical brighteners

(OBs), fluorescent laundry additives used as indicators of anthropogenic wastes. The

method was quantitative for OBs under variable levels of fluorescent colored dissolved

organic matter (CDOM). Based on excitation at 300-400 nm and 440 and 550 nm

emission, the method assumed a constant ratio of fluorescence due to CDOM alone, even

if absolute amplitude varied. Concentrations of OBs were computed as the difference

between the observed 440 nm emission and the expected CDOM fluorescence at 440 nm,

as extrapolated from the 550 nm fluorescence and established CDOM …

Investigation Of The Factors Influencing Skid Resistance And The International Friction Index, Luis G. Fuentes

USF Tampa Graduate Theses and Dissertations

This dissertation is compiled of the findings of several phases of a detailed research study that was aimed at investigating the Skid Resistance phenomenon. In the first phase of the dissertation research a study was performed to evaluate the different factors that influence frictional measurements obtained using the Dynamic Friction Tester (DFT). A temperature calibration factor that would account for temperature effects on DFT readings and IFI computations was developed. In addition, other variables that also affect the friction measurements obtained using the DFT are identified. In the next phase of the dissertation research the effect of pavement roughness on …

The Development Of A Human Polyomavirus Quantitative Pcr Assay To Assess Viral Persistence, Water Quality, And Human Health Risks, Shannon M. Mcquaig

USF Tampa Graduate Theses and Dissertations

Microbial water quality is generally assessed using fecal indictor organisms; however host-specific microbial source tracking (MST) methodologies can be employed to differentiate sources of fecal pollution. The central goal of this research was to develop and validate a QPCR assay for the quantification of two human-specific polyomaviruses (HPyVs) in environmental water samples. These viruses are prevalent worldwide and produce lifelong, asymptomatic viruria in immunocompetent individuals.

A Taqman® quantitative PCR (QPCR) assay based on the conserved T-antigen of two HPyVs (JCV and BKV) was developed and optimized (Chapter 2). HPyVs were detected in a high proportion of human-associated waste samples (e.g. …

Self-Fashioning, Consumption, And Japonisme: The Power Of Collecting In Tissot’S Jeunes Femmes Regardant Des Objets Japonais, 1869, Catherine Elizabeth Turner

USF Tampa Graduate Theses and Dissertations

This study examines self-fashioning and the practice of collecting in Second Empire Paris as manifest in James Tissot's Jeunes femmes regardant des objets japonais (1869, Cincinnati Museum of Art). The painting, exhibited in the Salon of 1869, conspicuously portrays Tissot's own collection of exotic Asian collectibles and the artist's private luxe interior. When scholars investigate and interpret Jeunes femmes, it is regularly defined within the prescriptive realm of Tissot's later London paintings, or of his well known series, La Femme à Paris. I argue for a less circumspect engagement with the painting, by focusing on the portrayal of …

Communication, Consumption And Manipulation: The Body As Language In The Films Of Jan Švankmajer, Amanda Marie Dowd

USF Tampa Graduate Theses and Dissertations

In this thesis I will analyze and discuss the work of renowned director Jan Švankmajer. Specifically, I will examine how director Jan Švankmajer’s representation of the body creates a metaphorical language. In addition, I will address what meaning can be gathered from, or made apparent through the commentary of the body’s language and discuss the significance of the socio-political implications. Prior to my discussion of Švankmajer’s work I will give a concise socio-political history of the Czech Republic from 1968-1994; this discussion will provide a framework for the subsequent analyses. In order to provide support for my argument, I will …

Running Toward The Apocalypse: John Updike’S New America, Bob Batchelor

USF Tampa Graduate Theses and Dissertations

My dissertation explores two critical points in understanding John Updike's recent career. First, I examine him from a perspective outside the heavily-studied Rabbit tetralogy. Focusing on Updike's novel Terrorist, I attempt to counter the misperception that he offers little beyond the chronicling of middle-class, suburban America. Instead, this work digs for a deeper understanding of Updike.

Next, I consider Updike's role as an artist, professional writer, and celebrity to draw out a sense of the writer's life in the twentieth and twenty-first centuries. Using him as a case study enables the analysis to include his changing role as a …

Pulsed Power And Load-Pull Measurements For Microwave Transistors, Sivalingam Somasundaram Meena

USF Tampa Graduate Theses and Dissertations

A novel method is shown for fitting and/or validating electro-thermal models using pulsed I(V) measurements and pulsed I(V) simulations demonstrated using modifications of an available non-linear model for an LDMOS (Laterally Diffused Metal Oxide Semiconductor) device. After extracting the thermal time constant, good agreement is achieved between measured and simulated pulsed I(V) results under a wide range of different pulse conditions including DC, very short (<0.1%) duty cycles, and varied pulse widths between these extremes. A pulsed RF load-pull test bench was also assembled and demonstrated for a VDMOS (Vertically Diffused Metal Oxide Semiconductor) and an LDMOS power transistor. The basic technique should also be useful for GaAs and GaN transistors with suitable consideration for the complexity added by trapping mechanisms present in those types of transistors.

Handover Performance In The Mobile Wimax Netrworks, Yongxue Yu

USF Tampa Graduate Theses and Dissertations

Mobile terminals allow users to access service while on the move. This unique feature has driven the rapid growth in the mobile network industry, changing it from a new technology into a massive industry in less than two decades.

In this thesis, an in-depth study of the handover effects of mobile WiMAX networks is carried out. The mobile WiMAX technology is first presented as literature study and then the technologies of handovers for previous generations are introduced in detail. Further, the hard handover of the mobile WiMAX is simulated by Network Simulator-2 (NS-2). In addition, the "ping-pang" effect of handover …

Architectures And Algorithms For Mitigation Of Soft Errors In Nanoscale Vlsi Circuits, Koustav Bhattacharya

USF Tampa Graduate Theses and Dissertations

The occurrence of transient faults like soft errors in computer circuits poses a significant challenge to the reliability of computer systems. Soft error, which occurs when the energetic neutrons coming from space or the alpha particles arising out of packaging materials hit the transistors, may manifest themselves as a bit flip in the memory element or as a transient glitch generated at any internal node of combinational logic, which may subsequently propagate to and be captured in a latch. Although the problem of soft errors was earlier only a concern for space applications, aggressive technology scaling trends have exacerbated the …

Biomechanical Model Of Transhumeral Prostheses, Rebekah Freilich

USF Tampa Graduate Theses and Dissertations

It has been shown that the interface between the prosthetic socket and residual limb (S-RL) interface is an important factor in determining acceptance and outcomes of upper limb prostheses. [1] Among the most common complaint from amputees is that the prosthesis is uncomfortable due to developing skin irritation which is usually attributed to poor fit (Nielson 1990). In order to understand why skin irritations can and do occur it is imperative to examine the biomechanical properties of the S-RL interface. A primary reason behind the development of skin irritation is instability of the socket upon the residuum. Alley (2009) asserts …

A Data Link Layer In Support Of Swarming Of Autonomous Underwater Vehicles, Daladier Jabba Molinares

USF Tampa Graduate Theses and Dissertations

Communication underwater is challenging because of the inherent characteristics of the media. First, common radio frequency (RF) signals utilized in wireless communications cannot be used under water. RF signals are attenuated in such as way that RF communication underwater is restricted to very few meters. As a result, acoustic-based communication is utilized for underwater communications; however, acoustic communication has its own limitations. For example, the speed of sound is five orders of magnitude lower than the speed of light, meaning that communications under water experience long propagation delays, even in short distances. Long propagation delays impose strong challenges in the …

Medicare Part D Program: Prescription Drug Plan Copayment Structure And Premium Sensitivity, Rui Dai

USF Tampa Graduate Theses and Dissertations

Since January 2006 Medicare beneficiaries have the option to purchase prescription drug benefits from Medicare under the Part D program. The addition of outpatient drugs to the Medicare programs reflects Congress’ recognition of the fundamental change in recent years in how medical care is delivered in the U.S. It recognizes the vital role of prescription drugs in the health care delivery system and the need to modernize Medicare to assure their availability to Medicare beneficiaries. The Medicare Prescription Drug Improvement and Modernization Act of 2003 (MMA) created the Medicare drug benefit and specified a standard plan. The law also enables …

Evaluation Of A Self-Monitoring Program To Increase Treatment Integrity Of Behavior Intervention Plans, Lela E. Taylor

USF Tampa Graduate Theses and Dissertations

The growing number of school-aged children displaying challenging behavior has increased the need for effective interventions. School-based consultants (SBC) report using behavioral consultation to assist teachers in designing behavior intervention plans (BIP) that help students engage in appropriate behavior in the classroom. Research indicates that direct training methods increase teacher's implementation of the BIP. One commonly used direct training method, performance feedback (PF), is used to assess teachers' treatment integrity. Research also indicates that checklists (non-direct measures) are more cost efficient methods. The purpose of this paper was to evaluate a direct training method used to train teachers to self-monitor …

Goal Attainment On Long Tail Web Sites: An Information Foraging Approach, James A. Mccart

USF Tampa Graduate Theses and Dissertations

This dissertation sought to explain goal achievement at limited traffic “long tail” Web sites using

Information Foraging Theory (IFT). The central thesis of IFT is that individuals are driven by a

metaphorical sense of smell that guides them through patches of information in their environment.

An information patch is an area of the search environment with similar information. Information

scent is the driving force behind why a person makes a navigational selection amongst a group

of competing options. As foragers are assumed to be rational, scent is a mechanism by which to

reduce search costs by increasing the accuracy on …

The Effects Of Professional Development Efforts On Educator Beliefs And Perceptions Of Competency Within A School-Based Response To Intervention Model, Joshua Nadeau

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to identify and understand relationships between educators' perceived skills, observed practices, and stated beliefs - as well as the impact of evidence-based professional development upon those relationships - during the first year of ongoing school-based implementation for Florida's Statewide Problem- Solving/Response to Intervention (PS/RtI) Project. The PS/RtI model is conceptualized as providing a data-based template to drive student service delivery decisions; as providing a tiered framework of assessment and evaluation to maximize efficiency of allocated school funds; and as defining the determination of eligibility for special education services to be based solely upon a …

Myth Management: The Nature Of The Hero In Callimachus’ Hecale And Catullus’ Poem 64, Oraleze D. Byars

USF Tampa Graduate Theses and Dissertations

Two of the best known examples of the Hellenistic epyllion are the Hecale by Callimachus and poem 64 by Catullus. Both poems feature Theseus, a traditional hero whose mythology dates to Homer and Hesiod. Callimachus chose an episode from the Theseus tradition which highlighted his positive side, while Catullus picked a chapter from the mythic stores which put him in the worst possible light. This paper will examine the two poet's use of mythological material - how they suppressed, included and altered the earlier traditions - to make their very antithetical cases for Theseus. In addition to Theseus, I will …

An Exploratory Analysis Of The Ecological Validity Of A Performance-Based Assessment Of Attention, Eun- Yeop Lee

USF Tampa Graduate Theses and Dissertations

Executive functions impact everyday functioning. An individual’s ability to adapt

to and navigate their physical and social environments is largely determined by the ability

to organize oneself, to plan and to coordinate activities. Despite the wide variety of

cognitive tests that assess various aspects of executive function, there has been little work

to validate the use of these measures in predicting real world functioning (Sbordone,

Seyranian, & Ruff, 2000), particularly in children where characterization of executive

function is less specified. Evaluating the ecological validity of neuropsychological tests

has become an increasingly important topic over the past decade (Chaytor & Schmitter- …

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 …

Nursing Advocacy And The Accuracy Of Intravenous To Oral Opioid Conversion At Discharge In The Cancer Patient, Maria L. Gallo R.N., O.C.N.

USF Tampa Graduate Theses and Dissertations

Pain is a common problem for cancer patients at home and when hospitalized. Pain interferes with all aspects of a patient's life including sleep, appetite, sexual desire, emotion and productivity. The under-prescribing of opioids can lead to uncontrolled pain in cancer patients. This study examined nursing advocacy related to pain management and the accuracy of the intravenous (IV) to oral (PO) opioid conversion at discharge in cancer patients.

Retrospective chart audits were done on 50 cancer patients. The physicians in the charts surveyed who prescribed the discharge medications consisted of a mix of hematologist/oncologists, surgeons and internists/hospitalists in a southwest …

Factors Surrounding And Strategies To Reduce Recapping Used Needles By Nurses At A Venezuelan Public Hospital, Luis J. Galindez Araujo

USF Tampa Graduate Theses and Dissertations

Nurses as health care workers are at risk of biological agents such as bacteria, viruses and others. At health care settings exposure to bloodborne pathogens can cause infections through needlestick injuries. The objectives of this research were to determine factors surrounding recapping needles in hospital nurses and to implement an educational strategy to reduce the recapping practices.

It was a descriptive and exploratory approach where the PRECEDE component of the PRECEDE/PROCEDE Model was used as the framework to systematize and analyze the information obtained from the focus group sessions.

A total of 120 nurses participated from four different departments. The …

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 …

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 …

How Plastic Is Vendobionta Morphology? A Geometric Morphometric Study Of Two Groups Of Pteridinium From The Latest Neoproterozoic, Michael B. Meyer

USF Tampa Graduate Theses and Dissertations

The analysis and interpretation of Vendobionta morphology is critical to elucidating a range of issues about their ontogeny and evolution, as well as life habits. These analyses, however, are complicated because these organisms are often morphologically enigmatic and defy ready categorization within modern taxonomic schemes. This study delves into the morphology of one of these problematic groups: Pteridinium. Specimens were investigated from two localities, Namibia and North Carolina, using geometric morphometrics. The landmark data, which was analyzed to compare specimens based on locality, taphonomy, and preservation, were subjected to three statistical tests: Principle Components Analysis, Procrustes shape analyses, 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 …

Population Genetics Of Antarctic Seals, Caitlin Curtis

USF Tampa Graduate Theses and Dissertations

I developed and tested a protocol for determining the sex of individual pinnipeds using the sex-chromosome specific genes ZFX and ZFY. I screened a total of 368 seals (168 crabeater, Lobodon carcinophagus; 159 Weddell, Leptonychotes weddellii; and 41 Ross, Ommatophoca rossii) of known or unknown sex and compared the molecular sex to the sex assigned at the time of collection in the Ross and Amundsen seas, Antarctica. Discrepancies ranged from 0.0% - 6.7% among species. It is unclear, however, if mis-assignment of sex occurred in situ or in the laboratory. It also is possible, however, that …

Effects Of A Commercially Available Energy Drink On Anaerobic Performance, Jason J. Downing

USF Tampa Graduate Theses and Dissertations

In an attempt to improve aerobic and anaerobic performance, athletes and fitness enthusiasts consume a variety of supplements. Because of this, energy drinks are quickly becoming more and more popular every day. Despite its highly addictive nature, caffeine, which is the main active ingredient in energy drinks, is gaining recognition as an ergogenic aid. However, due to the many factors that affects the action of caffeine, and because the research on caffeine and anaerobic performance is limited, the potential for studying energy drinks and anaerobic performance is quite large. PURPOSE: To determine if a commercially available energy drink has any …

Evaluating Dissolved Oxygen Regimes Along A Gradient Of Human Disturbance For Lotic Systems In West-Central Florida, Daniel G. Hammond

USF Tampa Graduate Theses and Dissertations

Land uses dominated by human activity can have a significant effect on ecological processes. In Florida, oxygen depletion is the most common impairment in lake, stream, and coastal water bodies. The continual growth and development in Florida, along with a conversion to more human intense land uses warrants study and discussion on impacts to dissolved oxygen regimes along a gradient of human disturbance. This research study is designed to identify observable trends in dissolved oxygen regimes along a gradient of increasing human intensity.

Twenty-six stations in the Tampa Bay area were selected to represent lotic systems in west-central Florida. Data …