Digital Commons Network^™

Influence Of Solution And Surface Chemistry On Yttrium And Rare Earth Element Sorption, Kelly Ann Quinn

USF Tampa Graduate Theses and Dissertations

The sorption behavior of yttrium and the rare earth elements (YREEs) was investigated using a variety of hydroxide precipitates over a range of solution conditions. Experiments with amorphous hydroxides of Al, Ga, and In were conducted at constant pH (~6.0) and constant ionic strength (I = 0.01 M), while YREE sorption by amorphous ferric hydroxide was examined over a range of ionic strength (0.01 M < ̲ I < ̲ 0.09 M), pH (3.9 < ̲ pH < ̲ 7.1), carbonate concentration (0 M < ̲ [CO32-]T < ̲ 150 micro-M), and temperature (10°C < ̲ T < ̲ 40°C). Sorption results were quantified via distribution coefficients, expressed as ratios of YREE concentrations between the solid and the solution, and normalized to concentrations of the sorptive solid substrate. Distribution coefficient patterns for Al, Ga, and In hydroxides were well correlated with the pattern for YREE hydrolysis.

In contrast, amorphous ferric hydroxide developed a distinct pattern that was different than those for Al, Ga, and In precipitates but similar to the pattern predicted for natural marine particles. YREE sorption was shown to …

Group Fission-Fusion Dynamics And Communication In The Bottlenose Dolphin (Tursiops Truncatus), Ester Quintana-Rizzo

USF Tampa Graduate Theses and Dissertations

The bottlenose dolphin exhibits a fission-fusion social structure characterized by temporary associations lasting from minutes to hours. Although social structure has been described for some dolphin communities, the selective pressures affecting fission-fusion patterns and their consequences on dolphin communication are not well understood. The goals of the present study were three-fold: 1) to quantify the rate with which fission-fusion occurred and identify the selective pressures influencing an individual's decision to leave and join a temporary group; 2) to examine the communication signals produced during temporary separations; and 3) to estimate the distances over which dolphins could remain in acoustic contact …

Leadership Predictors Of Proactive Organizational Behavior: Facilitating Personal Initiative, Voice Behavior, And Exceptional Service Performance, Johannes Rank

USF Tampa Graduate Theses and Dissertations

Proactive organizational behavior is characterized by self-started and long-term oriented activities involving forward thinking and the intention to effect change in one's work environment. The primary objective of this research was to investigate relationships of supervisory behaviors with subordinates' personal initiative, voice behavior, and proactive service performance and to reveal moderators and mediators of these associations. Whereas personal initiative represents a wide range of proactive behaviors, voice behavior specifically reflects challenging and constructive forms of change-oriented communication. Drawing on the proactivity, service, and performance literatures, the proactive service performance construct was newly conceptualized as self-started and long-term oriented service behavior …

Estimation Of Evapotranspiration Using Continuous Soil Moisture Measurement, Mandana Seyed Rahgozar

USF Tampa Graduate Theses and Dissertations

A new methodology is proposed for estimation of evapotranspiration (ET) flux at small spatial and temporal scales. The method involves simultaneous measurement of soil moisture (SM) profiles and water table heads along transects flow paths. The method has been applied in a shallow water table field site in West-Central Florida for data collected from January 2002 through June 2004. Capacitance shift type moisture sensors were used for this research, placed at variable depth intervals starting at approximately 4 in. (10 cm) below land surface and extending well below the seasonal low water table depth of 59 in. (1.5 m). Vegetation …

Mode Of Action And Structure­Activity Studies Of N­Alkylthio B­Lactams And N­Alkylthio­2­Oxazolidinones, And Synthesis Of Second­Generation Disulfide Inhibitors Of B­Ketoacyl­ Acyl Carrier Protein Synthase Iii (Fabh) As Potent Antibacterial Agents, Kevin David Revell

USF Tampa Graduate Theses and Dissertations

Work in the Turos group over the past five years has focused on the development of N-alkylthio beta-lactams, which show antibacterial activity against Staphylococcus (including MRSA), Bacillus, and others. These compounds do not function in the manner of the traditional beta-lactam antibiotics, but were thought to undergo an intracellular thiol-transfer to coenzyme A. In expanding the SAR of these novel compounds, it was found that N-alkylthio-2-oxazolidinones also exhibit antibacterial activity. Although CoA acts as the thiol-redox buffer in the genera most susceptible to the N-alkylthio beta-lactams, studies on Coenzyme A disulfide reductase (CoADR) show that the redox buffer is not …

Menendez Versus Mickey: A Study Of Heritage Tourism In Florida, Monica Rowland

USF Tampa Graduate Theses and Dissertations

The National Trust for Historic Preservation defines heritage tourism as: "traveling to experience the places and activities that authentically represent the stories and peoples of the past and present. It includes irreplaceable historic, cultural, and natural resources." Heritage tourism is a lucrative industry in the United States. On average, heritage tourists spend $623 per trip compared to $457 for all U.S. travelers. The rise of heritage tourism is inextricably linked with several trends in American society, namely: the historic preservation movement, the desire for a sense of place, and nostalgia. These motivating tendencies often inspire problems of authenticity, commodification, and …

Structure And Dynamics Of Heterogeneous Molecular Systems, Alfred B. Roney

USF Tampa Graduate Theses and Dissertations

Although current classical force fields describe homogeneous single-componentsystems fairly well, they do not represent the response of an individual molecule's electronic structure to its local environment with enough detail to reliably predict atomic motions in interfacial regions such as a solvation structure or liquid surface.Since most chemical processes of non-trivial interest involve two or more dissimilar molecules interacting at a short distance, molecular models must accurately simulate the interactions between different molecular species as well as bulk behavior in order to provide useful information. Results from two simulation studies are presented to illustrate both the utility of current point-charge electrostatics …

Detecting Publication Bias In Random Effects Meta-Analysis: An Empirical Comparison Of Statistical Methods, Gianna Rendina-Gobioff

USF Tampa Graduate Theses and Dissertations

Publication bias is one threat to validity that researchers conducting meta-analysis studies confront. Two primary goals of this research were to examine the degree to which publication bias impacts the results of a random effects meta-analysis and to investigate the performance of five statistical methods for detecting publication bias in random effects meta-analysis. Specifically, the difference between the population effect size and the estimated meta-analysis effect size, as well as the difference between the population effect size variance and the meta-analysis effect size variance, provided an indication of the impact of publication bias. In addition, the performance of five statistical …

How To Hear The Unspoken: Engaging Cross-Cultural Communication Through The Latin American Testimonial Narrative, Elena Flores Ruiz-Aho

USF Tampa Graduate Theses and Dissertations

This project seeks to address issues in cultural politics brought on by difficulties in cross-cultural communication, particularly as these problems manifest themselves in twentieth century Latin American testimonial narratives. By developing a critical line of questioning drawn from Gayatri Spivak's influential article "Can the Subaltern Speak," one aim herein is to analyze and describe the ways in which the narrative, Me Llamo Rigoberta Menchú Me Nació la Conciencia, translated into English as I, Rigoberta Menchú: An Indian Woman in Guatemala, exemplifies the incommensurable nature of cross-cultural discursive attempts. This is done through a twofold method: one, by placing heavy emphasis …

Archival Evaluation Of A Proactive School-Wide Discipline Plan, Beth Rutz-Beynart

USF Tampa Graduate Theses and Dissertations

The study conducted was an archival review of school detailed incident discipline records and description of the school-wide proactive discipline plan developed at an elementary school. The study examined the effects of sequential changes in a proactive school-wide discipline plan. Initially, the baseline data consisted of a full year of school without a proactive school-wide discipline plan. This allowed an assessment of the variation in referrals that occurred across a school year. Subsequent years were assessed in relation to this baseline, and the effects from year to year compared to other years. After the baseline year, substantial changes were made …

A Study On The Calibration And Accuracy Of The One-Step Tdr Method, Brian David Runkles

USF Tampa Graduate Theses and Dissertations

Traditional in-situ soil compaction monitoring methods are often limited in their application, thus quality control of compacted fills and roadway embankments remains a challenging problem. As a result, new methods are being developed to more accurately measure in-situ compaction parameters. Time domain reflectometry (TDR) is one such method. Several advances have been made over the past few years to further the use of TDR technology in water content and density measurement of compacted fill. The one-step method relies on the measurement of the apparent dielectric constant in conjunction with the bulk electrical conductivity, and correlates them through two soil-specific constants, …

The Social Construction Of School Refusal: An Exploratory Study Of School Personnel’S Perceptions, Anna Marie Torrens Salemi

USF Tampa Graduate Theses and Dissertations

Despite a multi-disciplinary, international literature, little research has drawn attention to the phenomenon of school refusal within the school. Most research on school refusal follows a positivist paradigm, focusing on the student, instead of examining the role of schools. Using a qualitative design and a social constructionist framework, this study explored how school personnel perceive school refusal, focusing on the social interactions, processes, and perceptions that construct their understanding. The study was conducted in a large school district in the Southeastern United States.Semi-structured in-depth interviews were conducted with school personnel at the middle school (N=42), high school (N=40), and district …

Zeolite Synthesis From Municipal Solid Waste Ash Using Fusion And Hydrothermal Treatment, Maysson Sallam

USF Tampa Graduate Theses and Dissertations

This dissertation investigates the possibility of producing zeolites from municipal solid waste ash, MSW ash, by using hydrothermal treatment alone and by introducing fusion at 550 °C prior to hydrothermal treatment. The study was performed at different treatment conditions where silica/aluminum ratio of 13.9 and 2.5, hydroxide concentrations of 1.5N, 2.5N and 3.5N, temperatures at 100°C and 60 °C and time at 6, 24 and 72 hours were the major variables used to study zeolites synthesis process. The possibility of forming zeolites A, P1 and X was of particular interest in the present study. Factors, mechanism and modeling of zeolite …

Using Fuzzy Logic To Enhance Control Performance Of Sliding Mode Control And Dynamic Matrix Control, Edinzo J. Iglesias Sanchez

USF Tampa Graduate Theses and Dissertations

Two application applications of Fuzzy Logic to improve the performance of two controllers are presented. The first application takes a Sliding Mode Controller designed for chemical process to reject disturbances. A fuzzy element is added to the sliding surface to improve the controller performance when set point change affects the control loop; especially for process showing highly nonlinear behavior. This fuzzy element, , is calculated by means of a set of fuzzy rules designed based on expert knowledge and experience. The addition of improved the controller response because accelerate or smooth the controller as the control loop requires. The Fuzzy …

Assessment Of Biogeochemical Deposits In Landfill Leachate Drainage Systems Phase Ii, Abdul R. Mulla Saleh

USF Tampa Graduate Theses and Dissertations

Land disposal of solid waste is a vital component of any solid waste management system. Design, operation and closure of municipal solid waste (MSW) landfills are required by regulations to control leachate and gases generated during the life, closure,and post-closure of the facility. Clogging of leachate drainage and removal systems in landfills is a common phenomenon and has been acknowledged in several landfills throughout the United States and abroad. This project was conducted in two phases. Phase I was completed in February of 2005 and Phase II was completed in August of 2006. Leachate characteristics data obtained in Phase I …

Intelligibility Of Clear Speech At Normal Rates For Older Adults With Hearing Loss, Billie Jo Shaw

USF Tampa Graduate Theses and Dissertations

Clear speech refers to a speaking style that is more intelligible than typical, conversational speaking styles. It is usually produced at a slower rate compared to conversational speech. Clear speech has been shown to be more intelligible than conversational speech for a large variety of populations, including both hearing impaired (Schum, 1996; Picheny, Durlach, & Braida, 1985; and Payton, Uchanski, & Braida, 1994) and normal hearing individuals (e.g. Uchanski, Choi, Braida, Reed, & Durlach, 1996) under a variety of conditions, including those in which presentation level, speaker, and environment are varied. Although clear speech is typically slower than normally produced …

Correlates Of Weight In Adolescents: A Path Analysis, Angela T. Sheble

USF Tampa Graduate Theses and Dissertations

This study examined the interrelationships between adolescent weight and several other variables thought to impact weight and obesity: physical activity, depressive symptoms, binge-eating symptoms, dieting, socio-economic status, special education status, gender, and ethnicity. The sample consisted of 251 high school students in rural Florida who completed measures of depression, binge-eating, dieting, and physical activity. Measurement instruments included the Reynolds Adolescent Depression Scale-2nd Edition (RADS-2), the bulimia scale of the Eating Disorder Inventory-2 (EDI-2), the dieting scale of the Dutch Eating Behavior Questionnaire (DEBQ), and a physical activity questionnaire derived from the Youth Risk Behavior Scale for Students (YRBSS). The study …

Heme Biosynthesis: Structure–Activity Studies Of Murine Ferrochelatase, Zhen Shi

USF Tampa Graduate Theses and Dissertations

Ferrochelatase catalyzes the terminal step of heme biosynthesis by inserting ferrous iron into protoporphyrin IX. The current study is aimed at understanding the structural basis of porphyrin binding and distortion in ferrochelatase-catalyzed reaction by functional analysis of a highly conserved active site loop motif. The loop was shown to contact bound porphyrin based on crystallographic and molecular modelling observations, and its role in murine ferrochelatase was assessed by random mutagenesis and steady-state kinetic analysis. To overcome the limitations of conventional kinetic assay methods for ferrochelatase, a continuous assay was developed by monitoring porphyrin fluorescence decrease using natural substrates ferrous iron …

Crossing Locations, Light Conditions, And Pedestrian Injury Severity, Naved Alam Siddiqui

USF Tampa Graduate Theses and Dissertations

This study assesses the role of crossing locations and light conditions in pedestrian injury severity through a multivariate regression analysis to control for many other factors that also may influence pedestrian injury severity. Crossing locations include midblock and intersections, and light conditions include daylight, dark with street lighting, and dark without street lighting. The study formulates a theoretical framework on the determinants of pedestrian injury severity, and specifies an empirical model accordingly. An ordered probit model is then applied to the KABCO severity scale of pedestrian injuries which occurred while attempting street crossing in the years 1986 to 2003 in …

Maternal Interaction Style, Reported Experiences Of Care, And Pediatric Health Care Utilization, Wendy Lauran Struchen Shellhorn

USF Tampa Graduate Theses and Dissertations

U.S. immunization and well child-care rates are below desired levels with lower income individuals being at higher risk for receiving inadequate care. To enhance the understanding of motivating factors to health care utilization, this study explored relationships between a mother's interaction style (secure, anxious, avoidant), her reported experiences with pediatric health care and her child's utilization of pediatric health care. Participants included 126 US-born, English-speaking women with an infant 12 to18 months of age. Linear regression analyses found no bivariate associations between maternal interaction style and reported experiences of care. Poisson regression analyses measured associations of maternal interaction style, reported …

Regulation Of Transcription And Analysis Of Drug Targets In Lymphoma And Myeloma Cells, Noah L. Silverman

USF Tampa Graduate Theses and Dissertations

The passage of two major hurricanes across southwest Florida (Category 5, Labor Day Hurricane of 1935; Category 4, Hurricane Donna 1960) resulted in fragmentation of mangrove forest at Big Sable Creek, Everglades National Park. Over time forest fragmentation led to forest loss and patchy conversion to unvegetated mudflats. My goal was to determine the consequence of forest fragmentation on nekton (i.e., fish and decapod crustaceans) inhabiting the intertidal zone. I used block nets across intertidal rivulets to compare nekton leaving replicate forest and unvegetated mudflat sites from October, 2002 through April 2004. Overall nekton density (individuals per 100 m3) was …

Effects Of A Multi-Component Interdependent Group Contingency Game On The Classroom Behaviors Of Typically Developing Elementary School Children, Stacey D. Simonds

USF Tampa Graduate Theses and Dissertations

Research in the field of applied behavior analysis indicates that all group-contingency programs have been effective in both increasing academic and behavior success in the classroom environment. Among the three types of group-contingency programs, this study investigated the effects of a multiple component interdependent group-oriented contingency program on the behavior of typically developing elementary students. The purpose of this study was to develop and analyze the effects of a classroom management system that teachers or educators could utilize to minimize problematic classroom behaviors while increasing adaptive classroom behaviors. The study was conducted within two third-grade classrooms from a local school …

Selling St. Petersburg: John Lodwick And The Promotion Of A Florida Paradise, Nevin D. Sitler

USF Tampa Graduate Theses and Dissertations

For over a century Florida's Tampa Bay area has been extolled for its abundant seashores and moderate climate. The success of early twentieth-century St. Petersburg as a tourist destination was due to a consistent method of self-promotion highlighting the natural and physical features of peninsular Pinellas County. Warmed by balmy Tampa Bay breezes, St. Petersburg had been dubbed the "Health City." This tiny 1890 coastal town of less than three hundred inhabitants, now blessed with a slogan, new train tracks, and a railway pier, was an ideal setting for tourism. By 1902, boosters declared St. Petersburg a city second to …

Geochemical Signatures In The Coral Montastraea: Modern And Mid-Holocene Perspectives, Jennifer Mae Smith

USF Tampa Graduate Theses and Dissertations

In the first phase of this project, four decades of monthly resolved geochemical variations from two massive heads of Montastraea were used to explore the reproducibility of the geochemical signal in these two corals from Looe Key, Florida. The coral d18O and d13C records of the two corals have statistically indistinguishable mean values, which is not the case for the coral Sr/Ca records implying that nonenvironmental factors are influencing coral Sr/Ca. Calibration equations relating coral geochemistry variations to environmental variations at Looe Key are different from previously published equations for Montastraea. These calibration differences are not related to growth-related kinetic …

Multiple Voices And The Single Individual: Kierkegaard’S Concept Of Irony As A Tool For Reading The Great Gatsby, The Sun Also Rises, Mrs. Dalloway, And Ulysses, Thomas P. Smith

USF Tampa Graduate Theses and Dissertations

The central issue in the works of Danish philosopher and religious thinker Soren Kierkegaard (1813-1855) takes the form of a question: "What does it mean to become a Christian?" However, Kierkegaard's ideas exerted influence well beyond Christian circles and have been important to many notable philosophical and literary figures, some of whom chose not to concern themselves primarily with this question (Sartre, Camus, Heidegger, Buber), and some of whom did choose to concern themselves primarily with this question (Tillich, Bonhoeffer, Berdyaev, Marcel). Even though Kierkegaard died in relative obscurity, thanks to posthumous translation of his works into German and to …

A Novel Air Sampling And Analytical Method For Determination Of Airborne Bronopol, John Charles Smyth

USF Tampa Graduate Theses and Dissertations

Bronopol has been used as a preservative in drugs and cosmetics since 1964. Bronopol has low dermal irritancy at levels commonly used in cosmetics and pharmaceuticals but it is significantly irritating at higher concentrations. Laboratory testing of bronopol indicates a low potential for dermal sensitization; however, a number of case reports demonstrate human allergenic reactions. No reports were identified on the allergenic properties of bronopol for the inhalation route of exposure. In 1983 approximately 5,200 people in the United States were occupationally exposed to bronopol. Current novel uses of bronopol include mold remediation and the sanitizing of ventilation system components. …

Environmental Variability In The Florida Keys: Impacts On Coral Reef Health, Inia M. Soto

USF Tampa Graduate Theses and Dissertations

I examined the hypothesis that high variability in Sea Surface Temperature (SST) and ocean color are associated with higher coral cover and slower rates of decline of coral cover within the Florida Keys National Marine Sanctuary (FKNMS). Synoptic SST time series maps, covering the period 1994-2005, were constructed for the FKNMS with data collected using the National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR) satellite sensors. The SST data were compared with coral cover time series assessments at 36 sites conducted by the Coral Reef and Evaluation Monitoring Program (CREMP; 1996-2005), sponsored by the Environmental Protection …

Advanced Registered Nurse Practitioners’ Judgments Of Coronary Heart Disease Risk, Kelly D. Stamp

USF Tampa Graduate Theses and Dissertations

Coronary heart disease (CHD) is the single largest killer of American males and females in the United States. According to the American Heart Association, (2005) approximately 41% of Americans that experience a coronary attack in a given year will die from it (AHA, 2005). To combat this growing problem, strategies need to be evaluated to assess how the identification of actual and potential CHD risks are made. This study utilized the Social Judgment Theory to gain insight into nurse practitioner's decision-making strategies. Sixty family or adult specialty nurse practitioners affiliated with the University of South Florida (USF) College of Nursing …

Preservice Teachers’ Responses To An Interactive Constructivist Model For Web-Based Learning, Cherry O. Steffen

USF Tampa Graduate Theses and Dissertations

College and university teacher education programs are not, and should not be, exempt from the growing demand for distance education opportunities. Science teacher education is no exception to this growing demand. While there are some distance-learning courses and even complete programs for teacher education, the majority of these are offered as continuing education or post-graduate education opportunities. The number of programs offered specifically in science teacher education (either undergraduate or post-graduate) is extremely limited. Those distance-learning classes that are available for teacher education rarely reflect the instruction expected from teachers by the National Science Education Standards when they enter the …

Considering Security In Florida’S Transportation Project Development Process, Phillip W. Stevens

USF Tampa Graduate Theses and Dissertations

The transportation decision-making process takes on different forms in different states. The purpose of this study was to include and move considerations for national, state, and local security needs into the transportation project development arenas with a focus on Florida. A thorough and updated literature review was completed to determine the current state of the industry regarding incorporating security considerations into the transportation planning process. A review of current Federal, State, and Local laws and regulations concerning planning requirements was conducted to outline planning parameters and limitations. An information request letter was mailed to the key planning staff members for …