American Studies Commons^™

Physiological Responses Of Thalassia Testudinum And Ruppia Maritima To Experimental Salinity Levels, Donna M. Berns

USF Tampa Graduate Theses and Dissertations

Thalassia testudinum, a stenohaline seagrass species, and Ruppia maritima, a euryhaline submerged aquatic vegetation species, were subjected to the same seven salinity levels (0 - 60) in a controlled environment. The response variables examined were the occurrence of leaf discoloration, plant growth rates, photosynthetic characteristics of blade segments (P_max, respiration, alpha, and I_k), and osmolality changes within the plant tissues. These response variables were measured at exposure times of one, seven, and 28 days.

Greater than 75% leaf discoloration occurred in Thalassia testudinum blades placed in 0, and 60 psu, while Ruppia maritima blades …

Design And Fabrication Of Multi – Dimensional Rf Mems Variable Capacitors, Hariharasudhan T. Kannan

USF Tampa Graduate Theses and Dissertations

In this work, a multi dimensional RF MEMS variable capacitor that utilizes electrostatic actuation is designed and fabricated on a 425um thick silicon substrate. Electrostatic actuation is preferred over other actuation mechanisms due to low power consumption. The RF MEMS variable capacitor is designed in a CPW topology, with multiple beams supported (1 - 7 beams) on a single pedestal. The varactors are fabricated using surface micromachining techniques. A 1um thick silicon monoxide (Er - 6) is used as a dielectric layer for the varactor. The movable membrane is suspended on a 2.5um thick electroplated gold pedestal. The capacitance between …

Comida Sin Frijoles No Es Comida: Evaluation Of A Type 2 Diabetes Education Program For Latinos, Danielle R. O'Connor

USF Tampa Graduate Theses and Dissertations

This thesis describes an internship for the Department of Anthropology that was part of the Florida Health Literacy Study (FHLS) conducted at the University of South Florida College of Public Health, Department of Community and Family Health in the spring and summer of 2003. The FHLS implemented Pfizer Inc.'s For Your Health program, a type 2 diabetes and hypertension education programs, at 14 community health clinics across the state of Florida. The internship was designed to elicit the experiences of 10 bilingual health educators about their experiences and their perceptions of the experiences of their Latino patients with type 2 …

Vibrofluidized Bed Drying Of Citrus Processing Residue For Byproduct Recovery, Eric A. Roe

USF Tampa Graduate Theses and Dissertations

Approximately 44% of the citrus that is processed becomes processing residue. The residue consists of the non-juice components of a citrus fruit, primarily peel and pulp, and is recovered by conversion to animal feed. The material is hygroscopic, agglomerating, has a wide particle size distribution, and must be carefully dried to avoid thermal damage to nutrients and flavors. This dissertation evaluates the possibility of utilizing a vibrofluidized bed dryer for citrus processing residue. Results demonstrate that it is possible to overcome the agglomeration difficulties associated with this material, offering an economically viable alternative processing methodology.

To properly analyze this proposed …

Self-Interference Handling In Ofdm Based Wireless Communication Systems, Tevfik Yücek

USF Tampa Graduate Theses and Dissertations

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that provides efficient bandwidth utilization and robustness against time dispersive channels. This thesis deals with self-interference, or the corruption of desired signal by itself, in OFDM systems. Inter-symbol Interference (ISI) and Inter-carrier Interference (ICI) are two types of self-interference in OFDM systems. Cyclic prefix is one method to prevent the ISI which is the interference of the echoes of a transmitted signal with the original transmitted signal. The length of cyclic prefix required to remove ISI depends on the channel conditions, and usually it is chosen according to the worst …

Learning Average Reward Irreducible Stochastic Games: Analysis And Applications, Jun, Li

USF Tampa Graduate Theses and Dissertations

A large class of sequential decision making problems under uncertainty with multiple competing decision makers/agents can be modeled as stochastic games. Stochastic games having Markov properties are called Markov games or competitive Markov decision processes. This dissertation presents an approach to solve non cooperative stochastic games, in which each decision maker makes her/his own decision independently and each has an individual payoff function. In stochastic games, the environment is nonstationary and each agent's payoff is affected by joint decisions of all agents, which results in the conflict of interest among the decision makers.

In this research, the theory of Markov …

Using The Ablls With English Language Learners: Implications For Students And Teachers, Lorie G. Schultz

USF Tampa Graduate Theses and Dissertations

English language learners are traditionally behind in academics such as reading, math and science. Hispanics, who make up the vast majority of English language learners, tend to not enroll in pre-school or higher education, have higher dropout rates and as adults earn less than whites. Common instructional strategies used in public schools are not meeting the needs of these students. The field of TESOL (Teachers of English to Speakers of Other Languages) has typically offered a wide variety of poorly defined teaching strategies that are not based on empirical research. Within public schools, assessment tends to serve the purpose of …

Toward An Integrated Communication Theory For Celebrity Endorsement In Fund Raising, Tracie M. Domino

USF Tampa Graduate Theses and Dissertations

Throughout the history of the United States, Americans customarily have given away their money, as well as their time to serve the common good. Americans will give "to build something, to fight something, or to save something" (Fink, 1990, p. 136). They make gifts to causes, or the societal problems represented by organizational missions, that are important to them. Individuals give not only to advance a common good, but also to receive private goods, or benefits that are internal, intangible, and in some cases, tangible (Steinberg, 1989).

To create this feeling of reciprocity for prospective donors who have not actually …

Distributed Supervisory Control Of Workflows, Pranav Deshpande

USF Tampa Graduate Theses and Dissertations

The need for redesigning existing business processes to improve their efficiency makes it essential to adequately represent, study, and automate them. The WFMC defines "workflow" as computerized facilitation or automation of a business process in whole or part. It is actually a representation of the given process, which is made up of well-defined collection of activities called tasks.

Modeling and specification of a workflow involves the following steps: 1) Provide formalism for modeling and specification of workflow 2) specify the tasks together with the associated information and 3) enter the applicable business rules in form of inter-task dependencies.

Earlier …

A Vlsi Architecture For Rijndael, The Advanced Encryption Standard, Naga M. Kosaraju

USF Tampa Graduate Theses and Dissertations

The increasing application of cryptographic algorithms to ensure secure communications across virtual networks has led to an ever-growing demand for high performance hardware implementations of the encryption/decryption methods. The inevitable inclusion of the cryptographic algorithms in network communications has led to the development of several encryption standards, one of the prominent ones among which, is the Rijndael, the Advanced Encryption Standard. Rijndael was chosen as the Advanced Encryption Standard (AES) by the National Institute of Standard and Technology (NIST), in October 2000, as a replacement for the Data Encryption Standard (DES). This thesis presents the architecture for the VLSI implementation …

Kinematic Analysis And Evaluation Of Wheelchair Mounted Robotic Arms, Edward Jacob Mccaffrey

USF Tampa Graduate Theses and Dissertations

The goal of this thesis is the kinematic analysis and evaluation of wheelchair mounted robotic arms. More specifically, to address the kinematics of the wheelchair mounted robotic arm (WMRA) with respect to its ability to reach positions commonly required by an assistive device in activities of daily living (ADL).

A robotic manipulator attached to a power wheelchair could enhance the manipulation functions of an individual with a disability. In this thesis, a procedure is developed for the kinematic analysis and evaluation of a wheelchair mounted robotic arm. In addition to developing the analytical procedure, the manipulator is evaluated, and design …

The Fleeting Effects Of Retrieval Cue Attributes In The Pier2 Memory Model, Amie L. Wilbanks

USF Tampa Graduate Theses and Dissertations

Processing Implicit and Explicit Representations (PIER2) is a model of memory that makes predictions about memory performance based on the interaction of known and newly acquired information by studying how implicitly activated associates affect episodic memory. Nelson and Zhang (2000) found a significant effect of cue connectivity in a multiple regression analysis of the variables known to affect cued recall, but at that time no manipulational experiments had studied the cue connectivity effect in the laboratory. The present paper presents a series of three experiments designed to investigate the effect of cue connectivity in the context of the PIER2 memory …

Simple Models For Predicting Dune Erosion Hazards Along The Outer Banks Of North Carolina, Lauren Mckinnon Wetzell

USF Tampa Graduate Theses and Dissertations

Hurricane hazards result from the combined processes of wind, waves, storm surge, and overwash (Lennon et al., 1996). Predicting the severity of these hazards requires immense effort to quantify the processes and then predict how different coastal regions respond to them. A somewhat simpler, but no less daunting task is to begin to predict the hazards due to potential erosion of barrier islands. A four-part scale has been developed by Sallenger (2000) to provide a framework for understanding how barrier islands might respond during extreme storm events. These four regimes describe how beach and dune elevations interact with surge and …

Characterization Of Large Area Cadmium Telluride Films And Solar Cells Deposited On Moving Substrates By Close Spaced Sublimation, Vishwanath Kumar

USF Tampa Graduate Theses and Dissertations

With CdTe based photovoltaics developed by close spaced sublimation reaching efficiencies of over 16%, commercialization of this technology draws serious attention. Today large area industrial modules have not been able to produce the same performance of their laboratory counterparts. This work provides a means for understanding the various technical challenges in developing an effective deposition technology for large area processing.

The submodule process investigated provides a model for continuous and sequential processing of subsequent films. The system has a unique design and constructed with the provision for a moving transport module for the substrate transport. The process was developed to …

Characterization Of Cadmium Zinc Telluride Solar Cells, Gowri Sivaraman

USF Tampa Graduate Theses and Dissertations

Currently thin film solar cells have efficiencies in the range of 16-18%. Higher efficiencies of 20% or more can be achieved by two junction solar cells in which two p-n junctions are connected in series one on top of the other in a tandem structure. The ideal bandgaps for optimum efficiency in a tandem structure are about 1eV for the top cell and 1.7 eV for the bottom cell. Copper Indium Gallium di-Selenide (CIGS) with a bandgap of 1 eV is a suitable candidate for the bottom cell and Cadmium Zinc Telluride (CZT) with a tunable bandgap of 1.44-2.26 eV …

An Assessment Of Paired Similarities And Card Sorting, Theodore James Dwyer

USF Tampa Graduate Theses and Dissertations

Alcohol expectancies have been shown to be predictive of risk for alcohol problems. Experimental research studies have challenged participants' expectancies with the end result demonstrating a mediational effect on participant drinking. Cognitive research using priming and word recognition tasks have led to the theory that expectancies operate in an associative network. Using dissimilarities information this network has been mapped using multidimensional scaling. The current techniques for collecting dissimilarities information directly in alcohol expectancy research has been limited to the use of the paired comparisons tasks. In order to investigate the utility of a different similarities task a comparison was made …

A Mathematical Model For Colloidal Aggregation, Colleen S. O'Brien

USF Tampa Graduate Theses and Dissertations

The characterization of fine particles is an area of immense significance to many industrial endeavors. It has been estimated that 70% of all industrial processes deal with fine particles at some point in the process. A natural phenomenon occurring in these processes is colloidal aggregation. This study examines aggregation in colloidal systems in order to characterize, examine, and control this occurrence in industrial processes. The study of particle aggregation has been broken into many different areas, such as collision mechanisms, interaction energy etc, but a complete model that integrates these different aspects has never been fully realized. A new model …

Development And Testing Of A Haptic Interface To Assist And Improve The Manipulation Functions In Virtual Environments For Persons With Disabilities, Rohit Tammana

USF Tampa Graduate Theses and Dissertations

Robotics in rehabilitation provides considerable opportunities to improve the quality of life for persons with disabilities. Computerized and Virtual Environment (VE) training systems for persons with disabilities, many of which utilize the haptic feedback, have gained increasing acceptance in the recent years. Our methodology here is based on creating virtual environments connected to a haptic interface as an input device. This robotic setup introduces the advantages of the haptic rendering features in the environment and also provides tactile feedback to the patients.

This thesis aims to demonstrate the efficacy of assistance function algorithms in rehabilitation robotics in virtual environments. Assist …

Fishing-Dependent Communities On The Gulf Coast Of Florida: Their Identification, Recent Decline And Present Resilience, Yu, Huang

USF Tampa Graduate Theses and Dissertations

U.S. fisheries legislation requires National Marine Fisheries Service (NMFS) to attend to the critical social and economic issues surrounding the definition and identification of fishing communities, and to the effects that changes to the physical environment and regulatory decisions can have on such communities. To fulfil their mandate, National Marine Fisheries Service (NMFS) sponsored the research entitled "Identifying Fishing Communities in the Gulf of Mexico" to study the economic, social and cultural status of potential fishing communities along the Gulf of Mexico.

NMFS contracted the research project to Impact Assessment, Inc. to study 80 plus potential fishing communities in the …

Three Dimensional Finite Element Model For Lesion Correspondence In Breast Imaging, Yan Qiu

USF Tampa Graduate Theses and Dissertations

Predicting breast tissue deformation is of great significance in several medical applications such as surgery, biopsy and imaging. In breast surgery, surgeons are often concerned with a specific portion of the breast, e.g., tumor, which must be located accurately beforehand. Also clinically it is important for combining the information provided by images from several modalities or at different times, for the planning and guidance of interventions. Multi-modality imaging of the breast obtained by mammography, MRI and PET is thought to be best achieved through some form of data fusion technique. However, images taken by these various techniques are often obtained …

Transport And Survival Of Water Quality Indicator Microorganisms In The Ground Water Environment Of Florida: Implications For Aquifer Storage And Waste Disposal, David E. John

USF Tampa Graduate Theses and Dissertations

Ground water resources are heavily used for drinking water supply and often as a receptacle for waste water. One concern is the possible contamination of wetland areas by ground water receiving septic system infiltration. To investigate this, two tracer studies were performed using the bacteriophage PRD-1 by seeding septic systems adjacent to wetlands with the phage and monitoring migration towards wetland areas. Transport velocities were evaluated based on appearance of tracer in sampling wells at various distances from the injection point. Velocities were estimated to be 0.25 m/d and 0.4 m/d at the two sites. Some retardation with respect to …

Homosocial, Homoerotic, Bisexual, And Androgynous Bonds In Shakespeare’S Comedies, Klarisa Sokolovic-Cizmek

USF Tampa Graduate Theses and Dissertations

In the thesis I inquire into the nature of the same-sex bonds in Shakespeare’s comedies. I discuss seven pairs of characters and demonstrate how in his comedies, Shakespeare first created homosocial relationships, later homoerotic relationships, then bisexual relationships, and, finally, a couple that may be described as androgynous. I demonstrate that in the early comedies the relationships are primarily homosocial and serve the purpose of self-realization. The self-realization includes reaching of a balance between a “feminine,” and a “masculine” self, with the goal of becoming a mature, androgynous human being. Although there are some homoerotic undercurrents in both the male …

Workflow Modeling Using Finite Automata, Atul Ravi Khemuka

USF Tampa Graduate Theses and Dissertations

A Workflow is an automation of a business process. In general, it consists of processes and activities, which are represented by well-defined tasks. These include 'Office Automation,' 'Health Care' and service-oriented processes such as 'Online Reservations,' 'Online Bookstores' and 'Insurance Claims,' etc. The entities that execute these tasks are humans, application programs or database management systems. These tasks are related and dependent on one another based on business policies and rules.

With rapid increases in application domains that use workflow management systems, there is a need for a framework that can be used to implement these applications. In particular, it …

Computer-Aided Diagnosis For Mammographic Microcalcification Clusters, Mugdha Tembey

USF Tampa Graduate Theses and Dissertations

Breast cancer is the second leading cause of cancer deaths among women in the United States and microcalcifications clusters are one of the most important indicators of breast disease. Computer methodologies help in the detection and differentiation between benign and malignant lesions and have the potential to improve radiologists' performance and breast cancer diagnosis significantly.

A Computer-Aided Diagnosis (CAD-Dx) algorithm has been previously developed to assist radiologists in the diagnosis of mammographic clusters of calcifications with the modules: (a) detection of all calcification-like areas, (b) false-positive reduction and segmentation of the detected calcifications, (c) selection of morphological and distributional features …

A Novel Normal-To-Plane Space Efficient Micro Corner Cube Retroreflector With Improved Fill Factor, Rahul Agarwal

USF Tampa Graduate Theses and Dissertations

A Corner Cube Retro-reflector (CCR) is a device that can be used as transmitters in wireless free space optical communication systems, or remote sensing instruments. A novel approach to fabricate the CCR is developed, where almost 100% of the planar chip area acts as the CCR compared to the maximum of 33% in the prior MEMS CCRs. Unlike the conventional micro machined CCRs that have two planes (mirrors of the CCR) normal to the surface of the wafer, our approach yields all the mirrors within the bulk of the wafer, ensuring very high packing densities and wide acceptance angles. The …

Feasibility And Emissions Of Compression Ignition Engines Fueled With Waste Vegetable Oil, Morgan H. Crawford

USF Tampa Graduate Theses and Dissertations

Research and experience has shown that vegetable oil can be processed, by transesterification, into a useable fuel for compression ignition engines. Earlier research examined using straight vegetable oil as a fuel, but found it to cause detrimental engine problems. Trial and error has shown that heating the vegetable oil prior to injection, is a viable option. A diesel vehicle engine was operated for over 188 hours or approximately 7,000 miles, using waste cooking oil as fuel. The longevity of the vehicle engine was limited by an undetermined engine failure.

Using stationary testing, with no engine load and various power settings, …

Design And Development Of A Silicon Carbide Chemical Vapor Deposition Reactor, Matthew T. Smith

USF Tampa Graduate Theses and Dissertations

The goal of this thesis is to present the design and development of a chemical vapor deposition reactor for the growth of high quality homoepitaxy silicon carbide films for electronic device applications. The work was performed in the Nanomaterials and Nanomanufacturing Research Center at the University of South Florida from 8/2001-5/2003.

Chemical vapor deposition (CVD) is the technique of choice for SiC epitaxial growth. Epitaxial layers are the building blocks for use in various semiconductor device applications. This thesis reports on a SiC epitaxy process where a carrier gas (hydrogen) is saturated with reactive precursors (silane and propane) which are …

Optimizing Cost And Data Entry For Assignment Of Patients To Clinical Trials Using Analytical And Probabilistic Web-Based Agents, Bhavesh Dineshbhai Goswami

USF Tampa Graduate Theses and Dissertations

A clinical trial is defined as a study conducted on a group of patients to determine the effect of a treatment. Assignment of patients to clinical trials is a data and labor intensive task. Usually, medical personnel manually check the eligibility of a patient for a clinical trial based on the patient's medical history and current medical condition. According to studies, most clinical trials are under-enrolled which negatively affects their effectiveness. We have developed web-based agents that can test the eligibility of patients for many clinical trials at once. We have tested various heuristics for optimizing cost and data entry …

Characterization And Formation Of Particulate Nitrate In A Coastal Area, Melissa Cheryl Foster Evans

USF Tampa Graduate Theses and Dissertations

Particulate nitrates play important roles in the atmosphere. They consist mainly of NH₄NO₃ and NaNO₃, products from the reactions of gaseous HNO₃ with gaseous NH₃ and sea salt, respectively. The gas-to-particle phase conversion of nitrate changes its deposition characteristics and ultimately changes the transport and deposition rates of the locally produced species. Studies were conducted to develop background information on the particle concentrations and size distributions and the chemistry and kinetics behind the interactions.

The predominant nitrate species in the Tampa Bay area was identified as coarse mode NaNO₃. NH_{4 …}

Assessing The Reproducibility Of Coral-Based Climate Records: A Multi-Proxy Replication Test Using Three Porites Lutea Coral Heads From New Caledonia, Christie L. Stephans

USF Tampa Graduate Theses and Dissertations

Coral-based climate studies commonly use elemental ratios and stable isotopes of coral skeletons to address seawater temperature and hydrologic balance issues in the tropical surface oceans. Replication, or cross-checking, a standard technique used to assess the fidelity of proxy records in paleoclimatology has not been widely applied in coral-based climate studies, primarily because of the time and cost associated with generating multiple records from a single reef site. Modern and paleoclimate reconstructions based on a single proxy-coral record from a site may contain errors if individual corals from the same reef record different geochemical signals. In this study we perform …