Digital Commons Network^™

Effect Of Tricalcium Silicate Content On Expansion In Internal Sulfate Attack, Troy T. Whitfield

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to determine the cementitious parameters and placement temperature that impact internal sulfate attack in concrete. Concrete structures make up a large percentage of the infrastructure and multifamily housing. Durability is very important. Cements can be formulated to reduce the impact of external environmental exposure such as high salinity from marine environments or high sulfate levels from soils or surface waters. Concrete is also subject to internal attack such as alkali aggregate reaction, (AAR), and delayed ettringite formation, (DEF). This study focused on some of the cement chemistry issues that determine susceptibility of cement to …

Understanding Activity Engagement And Time Use Patterns In A Developing Country Context, Amlan Banerjee

USF Tampa Graduate Theses and Dissertations

Flourishing economy, rapid industrialization and increasing trend of motorization have been shaping societies in the developing countries like India in an unprecedented manner.Infrastructure backlog amid such rapid growth in all imaginable directions has heavily exacerbated the urban transport crisis in these countries by alarming increase in vehicular travel demand, road fatalities, and environmental pollution. To address urban transport challenges, the necessary development and implementation of effective transport planning and policies have generally lagged in the developing countries compared to that seen in the developed countries due to several constraints including resource constraints, knowledge constraints, institutional constraints and so on. However, …

Community Of Practice As Community Of Learners: How Foreign Language Teachers Understand Professional And Language Identities, Ruth Ban

USF Tampa Graduate Theses and Dissertations

This study seeks to understand the transmogrification of four Mexican foreign language teachers as they participate in a teaching exchange in American schools throughout the United States. Previous research into development of competent membership in given communities of practice points to the need for mutual engagement with other community members, an understanding of the community activity, and a shared repertoire among community members. Framed within an activity theory perspective, the present study examined how the teachers's socio-historical background, cultural tools and artifacts, along with other pedagogical activities, community rules, and division of labor mediated the teachers' understanding of their professional …

Adolescent Alcohol Use And Educational Outcomes, Wesley A. Austin

USF Tampa Graduate Theses and Dissertations

There is some controversy over whether adolescent alcohol use has deleterious causal effects on educational outcomes. In particular, does drinking reduce academic performance and school enrollment rates and increase truancy, or does the observed negative correlation between drinking and educational outcomes merely reflect common unobservable factors? This dissertation sheds further light on the issue by estimating the causal impacts of alcohol use on various educational outcomes. Specifically, an instrumental variables model is estimated to study the effects of several drinking measures on grades, school enrollment and absenteeism.

Study Of Laplace And Related Probability Distributions And Their Applications, Gokarna Raj Aryal

USF Tampa Graduate Theses and Dissertations

The aim of the present study is to investigate a probability distribution that can be derived from the laplace probability distribution and can be used to model various real world problems. In the last few decades, there has been a growing interest in the construction of flexible parametric classes of probability distributions. Various forms of the skewed and kurtotic distributions have appeared in the literature for data analysis and modeling. In particular, various forms of the skew laplace distribution have been introduced and applied in several areas including medical science, environmental science, communications, economics, engineering and finance, among others. In …

Arts In New Directions: The Development And Application Of A Construct That Uses The Arts To Promote Transformation And Self-Actualization In Health Care And Education/Therapy, Alexxis Avalon

USF Tampa Graduate Theses and Dissertations

Artistic methods to evoke relaxation, spark creativity, and change self-perceptions are already being used by therapists, educators, and scientists. Interdisciplinary collaborations among researchers are developing to create new paradigms that incorporate the use of arts to empower individuals. By describing various connections between the arts and participants, researchers are looking at the expressive arts (including dance, music, drama, poetry, and visual arts) for transformation and self-actualization.The problem is that no construct is available to describe the transformation, "the conscious move from one deep structure of knowledge to another" (Wilber, 2004), that occurs when using the arts in health care and …

Implications Of Sleep Disorders Symptoms On School Behavior, Academics, And Quality Of Life, Erin Elizabeth Ax

USF Tampa Graduate Theses and Dissertations

Pediatric sleep problems are among the most common yet significant pediatric health issues faced by families. Sleep problems can impact social-emotional and academic functioning of schoolchildren. Once identified, pediatric sleep problems and disorders are treatable with effective and rapid behavioral and medical interventions. The purpose of the current study was to determine the prevalence rates of symptoms of sleep disorders in a diverse school-based sample as well as the relationship between symptoms of sleep disorders and school behavior, academic achievement, and quality of life. The present study examined the relationship between the independent variables of No Sleep Disorders symptoms and …

Are Respiratory Behaviors Affected In Individuals With Adductor Spasmodic Dysphonia?, Katie Biedess

USF Tampa Graduate Theses and Dissertations

Adductor spasmodic dysphonia (ADSD) is a focal dystonia that is characterized by voice breaks due to involuntary contractions of the adductor muscles of the vocal folds. These spasms can interfere with the coordination and balance of the respiratory and phonatory systems interfering with normal voice production. Disruptions in normal respiratory behaviors are well documented in inviduals with laryngeal disorders, including ADSD. Previous research regarding respiratory processes in ADSD has focused on airflow and pressure; however, there are many other parameters that have not been considered and may shed new light on the respiratory behaviors of individuals with ADSD. Therefore, the …

Mathematical Model Of Arsenic Adsorption In A Modified Zeolite / Microfiltration System, Miles B. Beamguard

USF Tampa Graduate Theses and Dissertations

Carcinogenic health concerns over arsenic in drinking water caused the USEPA to reduce the maximum contaminant level (MCL) from 50 to 10 ppb, effective on January 23, 2006. This has forced many smaller utilities into expensive treatment or discontinuation of water distribution. Researchers throughout the world are working to develop an inexpensive method for arsenic removal to meet this MCL. Aluminum silicates, or zeolites, are naturally occurring ionic sorbents. Modification of a zeolite may enhance adsorption capacities and ion selectivity. This research investigates the arsenic adsorption capacities of a modified Chabazite. This adsorption, coupled with a hollow fiber, microfiltration membrane …

Crystal Engineering Of Organic Compounds Including Pharmaceuticals, Joanna A. Bis

USF Tampa Graduate Theses and Dissertations

Neutral or charge-assisted hydrogen bonds occurring between organic molecules represent strong and directional forces that mediate the molecular self-assembly into well defined supramolecular architectures. A proper understanding of hydrogen bonding interactions, their types, geometries, and occurrence in supramolecular motifs, is a prerequisite to crystal engineering, i.e. to the rational design of functional solid materials.Multiple-component organic crystals represent ideal systems to study the intermolecular interactions between the constituent molecules that can be pre-selected for their hydrogen bonding sites and geometrical capabilities. In particular, the systematic structural analysis of supramolecular systems that are comprised of simple molecules facilitates the development of strategies …

Development Of Ganglioside-Based Assays For The Identification Of Botulinum And Cholera Toxins Utilizing An Evanescent Wave Biosensor, Crystal M. Bedenbaugh

USF Tampa Graduate Theses and Dissertations

An evanescent wave fiber-optic biosensor was used in an effort to develop an assay for the rapid detection of two biological toxins: cholera toxin and botulinum toxin. The Analyte 2000 fiber-optic biosensor utilizes a sandwich immunoassay format. Gangliosides or liposomes are directly adsorbed to the surface of the fiber-optic waveguide through hydrophobic interactions. The waveguide is exposed to a sample containing the toxin of interest, then subsequently exposed to a polyclonal detection antibody conjugated to the fluorophore cyanine 5. Excitation light from a 635nm laser diode is propagated through the waveguide and fluorescent molecules within approximately 100nm of the waveguide …

The Role Of Mental Health Problems In Explaining Violent Behaviors In Children And Adolescents Over The Lifecourse: An Exploratory Study, Denise Paquette Boots

USF Tampa Graduate Theses and Dissertations

Juvenile violence is a phenomenon that consistently garners great attention in the media, the public, and across a multitude of academic disciplines. A growing body of literature in developmental and lifecourse criminology has called for innovative research to further investigate the causes and correlates of serious juvenile offenders. Toward this end, the present study uses prospective, longitudinal data from the Pittsburgh Youth Study (PYS) to gauge the temporal impact of childhood and adolescent mental health problems on the development of serious offending behaviors in boys. Borrowing largely from the work of Achenbach and colleagues (2001), data from parent and teacher …

Gene Expression Profiles And Clinical Parameters For Survival Prediction In Stage Ii And Iii Colorectal Cancer, Mubeena Begum

USF Tampa Graduate Theses and Dissertations

Prediction of outcome in colorectal cancer (CRC) is currently based on the TNM staging classification; however, histopathological classification alone is insufficient for accurately predicting survival in stage II and III patients. Studies indicate that microarray gene expression profiles can predict survival in CRC. We hypothesize that tumor gene expression in combination with clinical parameters, is a better predictor of outcome in stage II and III colorectal cancers than the TNM stage classification alone. Clinical records and follow-up data were retrospectively reviewed for 58 Stage II and Stage III patients with primary colorectal cancer, who did not receive any neoadjuvant therapy …

B-Raf Is An Essential Component Of The Mitotic Machinery Critical For Activation Of Mapk Signaling During Mitosis In Xenopus Egg Extracts, Sergiy I. Borysov

USF Tampa Graduate Theses and Dissertations

Activation of the MAPK cascade during mitosis is critical for spindle assembly and normal mitotic progression. The underlying regulatory mechanisms that control activation of the MEK/MAPK cascade during mitosis are poorly understood. The goal of my dissertation research is to identify the MEK kinase responsible for activation of the MAPK cascade during mitosis and to elucidate the biochemical mechanisms that regulate its activity. In the described herein work I purified and characterized the MEK kinase activity present in M-phase arrested Xenopus egg extracts. I demonstrate that B-Raf is the critical MEK kinase required for activation of the MAPK pathway at …

A Case Study Of A School Implementing A Constructivist Philosophy, Joseph C. Brown

USF Tampa Graduate Theses and Dissertations

Isaacson's (2004) dissertation chronicles the implementation of a constructivist instructional approach at Southwood Elementary School. Southwood's faculty experienced a change of principals, which the Tri-Partite Theory of Organizational Change and Succession, a theory of organizational entropy, predicts could lead to organizational entropy. This study examines the dynamics of the change in principal, as well as Isaacson's recommendation to study teachers' perceptions regarding the maintenance of the constructivist approach. This study answers three questions: 1) Are faculty still using constructivist strategies? 2) What are teacher perceptions regarding the maintenance and support of constructivist philosophy? 3) Is there congruence between what literature …

Teaching Strategies Of Successful College Trombone Professors For Undergradute Students, Matthew T. Buckmaster

USF Tampa Graduate Theses and Dissertations

This study identified teaching strategies of successful trombone professors for undergraduate trombone students. Participants were three professors at accredited colleges in the United States who had received international awards in the field of trombone pedagogy. A comprehensive interview instrument was administered to each participant in a multiple case studies research design. From the gathered data, a classical content analysis revealed 79 emergent themes from 375 coded passages, with 45 of the emergent themes being commonalities among the three participants. In addition to specific teaching strategies, three meta-themes emerged from an examination of these commonalities: Product Over Process, Individualized Teaching Approaches, …

Micronektonic Community Composition And Trophic Structure Within The Bathypelagic Zone In The Eastern Gulf Of Mexico, Scott E. Burghart

USF Tampa Graduate Theses and Dissertations

The Earth's most extensive living space is found in the bathypelagic zone of the oceans, yet research in these areas is scant. The micronekton of the bathypelagic zone in the eastern Gulf of Mexico (EGOM) was investigated with the goals of comparing its community structure and trophic interactions with those of the well-studied overlying mesopelagic micronekton. Significant changes in faunal structure were found, including shifts in dominant families as well as species. Compared to the mesopelagic zone, the bathypelagic community had increased abundance and biomass contributions from the Gonostomatidae, Oplophoridae,and Eucopiidae, with a simultaneous decrease in the importance of the …

Cue Reactivity And The Role Of Social Alcohol Expectancies In The College-Aged Drinking Population, Ashlee C. Carter

USF Tampa Graduate Theses and Dissertations

Research has shown alcohol expectancies to be critically important in understanding maladaptive drinking patterns within alcohol use disorders. Alcohol expectancies, thought to be automatically elicited in the presence of environmental alcohol-related cues, represent both cognitive and affective associations with drinking behavior. However, the automatic and affective properties of alcohol expectancies have not yet been thoroughly measured in the literature. Psychophysiological measures, including skin conductance, heart rate, and the acoustic startle response in particular, offer a uniquely powerful set of indices for the automatic affective processing of alcohol-related cues.

Therefore, the present study was designed to examine how alcohol expectancies moderate …

Folk Wiki: The Shared Traditions Of Folk Music And The Wiki Way, Phillip Mark Chamberlin

USF Tampa Graduate Theses and Dissertations

Wiki is often perceived as representing a revolutionary break from conventional notions of authorship, writing, and textual history. Dialogues concerning Wiki tend to ignore the characteristics that Wiki shares with earlier forms of collaboration, particularly folk music. In both Wiki and folk music, content is often collectively shared and authored, even if specific individuals create and change the content. Many collaborators are anonymous, quasi-anonymous, or pseudo-anonymous, but the perception of this anonymity is, in both genres, problematic. Second, both Wiki documents and folk songs exist in the "Eternal Now," a seemingly perpetual state that makes these texts available for addition, …

The Effects Of Multimedia Annotations On L2 Vocabulary Immediate Recall And Reading Comprehension: A Comparative Study Of Text-Picture And Audio-Picture Annotations Under Incidental And Intentional Learning Conditions, Zhaohui Chen

USF Tampa Graduate Theses and Dissertations

This dissertation investigated the effects of multimedia annotation on L2 vocabulary learning and reading comprehension. The overarching objective of this study was to compare the effects of text-picture annotation and audio-picture annotation on L2 vocabulary immediate recall and reading comprehension. This study also sought to examine the different effects under incidental and intentional learning conditions. The participants were 78 intermediate adult ESL learners from three universities in northwest U.S. The participants read an Internet-based English text. Twenty target words, annotated in either text-picture or audio-picture, were embedded in the reading text. The participants accessed the annotations by clicking on the …

Performance Based Design Of Degrading Structures, Mouchir Chenouda

USF Tampa Graduate Theses and Dissertations

Seismic code provisions are now adopting performance-based methodologies, where structures are designed to satisfy multiple performance objectives. Most codes rely on approximate methods to predict the desired seismic demand parameters. Most of these methods are based on simple SDOF models, and do not take into account neither MDOF nor degradation effects, which are major factors influencing structural behavior under earthquake excitations. More importantly, most of these models can not predict collapse explicitly under severe seismic loads. This research presents a newly developed model that incorporates degradation effects into seismic analysis of structures. A new energy-based approach is used to define …

Traumatic Loss And Transformative Life Experiences: The Lived Experience Of Green Cross Traumatologists Deployed To The New York City World Trade Center Disaster, Carron C. Cherrie

USF Tampa Graduate Theses and Dissertations

This exploratory study examines the lived experience of Green Cross traumatologists deployed to the New York City World Trade Center disaster. The deployment took place five days after the terrorist attacks on September 11, 2001. The author was a member of a ten member advance team that provided crisis stabilization services to an international union in Lower Manhattan. Disaster Mental Health Services and community outreach were provided for a month. The purpose of the study was to describe in an anthropologically holistic perspective the lived experience of traumatologists, who as Americans were also affected by the terrorist disaster. Thirty-one traumatologists …

Framing Requests For Parental Participation In Family Research, David Clay

USF Tampa Graduate Theses and Dissertations

This study focused on fathers and their willingness to participate in family related research studies. Traditional expectations of parental roles have hindered the inclusion of fathers in research studies despite gradual changes in cultural norms and research studies that indicate fathers have a significant influence on the developmental outcomes of children. Recent work in this area indicates that fathers are just as likely as mothers to participate in family related research. This study sought to shed light on this issue. Employees at three large Southeastern Universities were asked to participate in one of three different types of research: Academics, Athletics, …

Bacteriophage For The Elimination Of Methicillin-Resistant Staphylococcus Aureus (Mrsa) Colonization And Infection, Angela Clem

USF Tampa Graduate Theses and Dissertations

Methicillin-resistant Staphylococcus aureus (MRSA) is among the most important pathogens affecting the human race in our time. In spite of recent medical advances, our therapeutic choices for MRSA infections remain limited due to the propensity of this organism to develop resistance to antimicrobials. Therefore, there is a continuing need to develop newer methods of treating MRSA infections. This dissertation examines the effects of bacteriophages 88 and 92 on ten clinical isolates of MRSA from the central Florida area. . For the majority of the MRSA isolates, bacteriophages 88 and 92 were unable to induce lysis. However, bacteriophage 88 was found …

The Influence Of Performance Background On Instrumentalists' Ability To Discriminate And Label Cornet And Trumpet Timbre, Gary Compton

USF Tampa Graduate Theses and Dissertations

This study was an examination of timbre discrimination and labeling, with specific consideration of the soprano-brass timbres of cornets and trumpets. This study sought to determine whether instrumentalists differed in their ability to label and discriminate cornet and trumpet timbres, and whether these abilities were influenced by the instrumentalists' performing instrument and years of playing experience. Wind, brass and percussion players (n=100) from existing instrumental groups in the Tampa Bay area participated in the study. These groups were collegiate trumpet majors from a large public university school of music, a collegiate wind ensemble from a private university, and a brass …

The Effects Of Community-Based Service-Learning On Preservice Elementary Teachers' Self-Efficacy Beliefs About Equitable Science Teaching And Learning, Neporcha T. Cone

USF Tampa Graduate Theses and Dissertations

The National Science Education Standards (NRC, 1996) and Science for all Americans (AAAS, 1989) explicitly state that all students regardless of their age, cultural or ethnic backgrounds, gender, abilities, aspirations, or interest in science should have access to equitable educational resources in science. These equitable resources also include access to efficacious teachers of all students. However, the Standards fail to explicate what practices, if any, lead to the development of these teachers. The primary purpose of this study was to identify teacher education practices that positively influenced preservice elementary teachers' self-efficacy beliefs about equitable science teaching and learning. More specifically, …

Risk And Protective Factors Related To Resilience In Adolescents In An Alternative Education Program, Kelly M. Crawford

USF Tampa Graduate Theses and Dissertations

Using a multivariate correlational design, this study was designed to determine the degree to which selected risk and protective factors were related to resilience in an at-risk student population. A total of 12 individual, family and external risk and protective factors were identified and data were collected from 142 6th through 11th grade students in an alternative education program for individuals who had committed severe behavioral infractions. A series of multiple regression analyses were conducted using three outcome variables: a rating of students' resilient behavior, number of behavior referrals in the students' records, and standardized reading achievement scores. Five percent …

Some Problems On Products Of Random Matrices, Edgardo S. Cureg

USF Tampa Graduate Theses and Dissertations

We consider three problems in this dissertation, all under the unifying theme of random matrix products. The first and second problems are concerned with weak convergence in stochastic matrices and circulant matrices, respectively, and the third is concerned with the numerical calculation of the Lyapunov exponent associated with some random Fibonacci sequences. Stochastic matrices are nonnegative matrices whose row sums are all equal to 1. They are most commonly encountered as transition matrices of Markov chains. Circulant matrices, on the other hand, are matrices where each row after the first is just the previous row cyclically shifted to the right …

Resonance Ultrasonic Vibrations (Ruv) For Crack Detection In Silicon Wafers For Solar Cells, William Dallas

USF Tampa Graduate Theses and Dissertations

The photovoltaic industry provides a pathway to allow renewable energy to meet world wide consumer energy needs. Past and present research and development on silicon based solar cells have helped make them the dominant player in the photovoltaic industry accounting for over 75% in 2005 as accounted by the US Department of Energy. One of the current technological problems is to identify and eliminate sources of mechanical defects such as thermo-elastic stress and cracks leading to the loss of wafer integrity and ultimately breakage of as-grown and processed Si wafers and cells.The RUV method, developed at the University of South …

Reconstructing 20th Century Sst Variability In The Southwest Pacific: A Replication Study Using Multiple Coral Sr/Ca Records From New Caledonia, Kristine L. Delong

USF Tampa Graduate Theses and Dissertations

Coral-based climate reconstructions typically have not used multiple cores from a region to capture and replicate a climate signal largely because of concerns focused on coral conservation, analytical expense, and time constraints. Coral Sr/Ca reproducibility through the 20th century was investigated using three intra-colony and three inter-colony coral records, from the reefs offshore of Amédée Island, New Caledonia. Different sampling resolutions were examined in coral Sr/Ca (fortnightly and monthly) and delta 18O (fortnightly, monthly, and seasonally) as well as similar scale subsampling of the daily in situ SST record. The mean coral Sr/Ca, delta 18O, and daily SST values do …