Digital Commons Network^™

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, …

Teaching Philosophy And Practices Among Chemistry Faculty Attending Mid Project Workshops : Implications For Reform In Chemistry, Beverly Dee Barker

USF Tampa Graduate Theses and Dissertations

Over the past decade over 600M in funding has been devoted to bringing about reform in science education, but little is known about who is implementing reform, the extent of reform implementation and how educational contexts differentially impact reform innovations. This dissertation explores the results of the Multi-Initiative Dissemination Project (MID Project), a national curriculum reform program that was designed to propagate reform pedagogy among undergraduate chemistry faculty in faculty development workshops. We analyzed data from surveys, in-class observations and faculty interviews to explore the relationships between the participant faculty demographic features and their pedagogy and teaching philosophy before and …

Rsvp: An Investigation Of The Effects Of Remote Shared Visual Presence On Team Process And Performance In Urban Search & Rescue Teams, Jennifer L. Burke

USF Tampa Graduate Theses and Dissertations

This field study presents mobile rescue robots as a way of augmenting communication in distributed teams through a remote shared visual presence (RSVP) consisting of the robot's view. It examines the effects of RSVP on team mental models, team processes, and team performance in collocated and distributed Urban Search & Rescue (US&R) technical search teams, and tests two models of team performance.

Participants (n=50) were US&R task force personnel drawn from high-fidelity training exercises held in California (2004) and New Jersey (2005). Data were collected from the 25 dyadic teams as they performed a 2 x 2 repeated measures search …

Estimation Of The Particle And Gas Scavenging Contributions To Wet Deposition Of Organic And Inorganic Nitrogen, Silvia Margarita Calderã³N

USF Tampa Graduate Theses and Dissertations

Atmospheric deposition of nitrogen species represents an additional nutrient source to natural environments, and can alter the nitrogen cycle by increasing nutrient levels beyond the requirements of organisms. In Tampa Bay, atmospheric deposition of dissolved inorganic nitrogen species (DIN) has been found to be the second largest nitrogen source, but little is known about dissolved organic nitrogen species (DON). The research goal was to improve the dry and wet deposition estimates by inclusion of the DON contribution. In the atmospheric chemistry field a standard method to measure DON in atmospheric samples has not been agreed upon. This research proposes the …

Investigation Of Normalized Streamflow In West Central Florida And Extrapolation To Ungaged Coastal Fringe Tributaries, Kim Beth Clayback

USF Tampa Graduate Theses and Dissertations

Deriving accurate streamflow estimates for ungaged watersheds provides a challenging task for water resource engineers. Traditional methods include correlation to the nearest USGS streamflow station or numeric simulation of watershed rainfall-runoff processes. Mean annual flow, ten percent exceedance and other streamflow indices can be normalized and non-dimensionalized by dividing by the watershed drainage area and the mean annual precipitation rate. Obtaining non-dimensional parameters can be especially useful for extrapolation of flows to downstream, ungaged, coastal fringe regions. Florida and other states along the Gulf Coast exhibit strong variability in the magnitude of streamflow fraction of precipitation. The irregular patterns created …

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, …

Biomechanical Evaluation Of Independent Transfers And Pressure Relief Tasks In Persons With Sci: Pilot Study, Tony J. Cresta

USF Tampa Graduate Theses and Dissertations

Persons with paraplegia who use a manual wheelchair for mobility are at high risk for overuse injuries in the upper extremities. Years of shoulder overuse performing transfers, wheelchair propulsion, dressing, bathing, and household chores, (activities of daily living or ADL) leads to an increased incidence of cumulative trauma to the shoulders. Few studies have addressed the stressful task of wheelchair transfers among SCI individuals. The goal of this pilot study is to develop valid and reliable measurement technologies to quantify shoulder musculoskeletal stressors during wheelchair transfers and pressure relief tasks among individuals with SCI. Using a standard wheelchair, 10 participants …

Evaluation Of The Long-Term Effect Of Inorganic Leachate On Geosynthetic Clay Liners, Darwish El-Hajji

USF Tampa Graduate Theses and Dissertations

Because of its low permeability and high swelling characteristics, bentonite is used in various hydraulic barrier systems and in the manufacturing of Geosynthetic Clay Liners (GCLs). Exposure to inorganic solutions containing elevated concentrations of electrolyte can significantly increase their permeability. To enhance the bentonite's chemical resistance to inorganic solutions, the manufacturers of GCL materials introduced propriety soluble polymeric compounds as an additive to bentonite. The resulting materials are referred to as polymer-treated, chemically-enhanced, or contaminant-resistant clays, and are arguably resistant to a host of inorganic chemicals. In this study, the response of both regular and polymer treated bentonite clays to …

Storm-Influenced Sediment Transport Gradients On A Nourished Beach, Nicole A. Elko

USF Tampa Graduate Theses and Dissertations

Beach nourishment provides an excellent opportunity for the study of intensified sediment transport gradients and associated morphological changes in a natural setting. The objectives of this study are to quantify and predict longshore and cross-shore transport gradients induced by 1) beach nourishment, 2) different storm wave conditions, and 3) the annual wave climate and long-term sediment supply. The details of sediment transport rates and gradients induced by gradual processes and high-energy events are analyzed on a macro-scale. Well-planned monitoring of the 2004 Upham Beach nourishment project in west-central Florida collected high-spatial and -temporal resolution field data. Three hurricanes passed by …

Investigation Into The Hydrogen Gas Sensing Mechanism Of 3c-Sic Resistive Gas Sensors, Timothy J. Fawcett

USF Tampa Graduate Theses and Dissertations

The hydrogen (H2) gas sensing mechanism driving 3C-SiC resistive gas sensors is investigated in this work in which two hypotheses are proposed. One hypothesis involves the surface adsorption of H2 on the sensor surface with the adsorbed molecules influencing the flow of current in a resistive gas sensor, termed the surface adsorption detection mechanism. The second hypothesis includes the transfer of heat from the sensor to the gas, producing a change in the temperature of the device when the heat transfer characteristics of the gas change, termed the thermal detection mechanism. The heat transfer characteristics of the gas are dependent …

Effectiveness Of Environmental Regulations: Monitoring By The Regulated Community Under Clean Water Act Industrial Stormwater Runoff Requirements, Kelly L. Gleaton

USF Tampa Graduate Theses and Dissertations

This research identified and evaluated possible uses of environmental monitoring data collected and reported by industrial facilities under the Clean Water Act requirements and determined whether the current regulatory system supported any of those uses. Federal policies and state-level policies in the United States, Florida, and California were evaluated in order to determine whether the current regulatory system supported any of the identified uses. Monitoring programs and currently available monitoring data were evaluated from Hillsborough County, Florida, and Los Angeles County, California, from the perspective of 1) the current implementation of the monitoring program, and 2) perfect implementation under full …

The Use Of Mini-Pile Anchors To Resist Uplift Forces In Lightweight Structures, Julio Aguilar

USF Tampa Graduate Theses and Dissertations

In the state of Florida one of the primary factors which influences design of structures is the effect of hurricane force winds on structures. These forces can be greater than any other force encountered throughout the lifetime of said structure. For this reason, designing a structure to resist such forces can greatly increase the cost and time required for completing construction projects. Traditionally, large concrete footings have been utilized to resist wind-induced uplift forces. These footings do little more than act as large reaction masses to weigh down the building. An alternative and little-used method for resisting these large uplift …

Detection Of Pathogenic Bacteria And Fecal Enterococci In Recreational Water With An Evanescent Wave Fiber Optic Biosensor, Maria Theresa Trindade

USF Tampa Graduate Theses and Dissertations

Development of a rapid method for the detection of fecal enterococci and pathogenic microorganisms in beach water was attempted utilizing an evanescent wave fiber optic biosensor. Various assay formats including a sandwich immunoassay were tested in the development of a rapid assay. Fluorophore labeled antibodies were used for specific detection of bacteria captured or adsorbed directly to the surface of a polystyrene fiber optic waveguide. Binding of the fluorescent labeled antibody to its specific target or binding of a fluorescent labeled anti-IgG within 100-1000 nm of the waveguide surface caused excitation of the fluorescent conjugate resulting in a quantifiable signal. …

The Solubility Of Triton X-114 And Tergitol 15-S-9 In High-Pressure Carbon Dioxide Solutions, Brandon Smeltzer

USF Tampa Graduate Theses and Dissertations

In the sol gel production of high surface area catalyst, the template, a surfactant, is

the key component of the process. A template too soluble in the supercritical dryingextraction

process can yield a catalyst with a lower surface area. A template completely

insoluble in the supercritical drying-extraction process can lead to a longer calcinations

step and lower catalyst surface area. Template recovery also enhances the economic

feasibility of plant scale production of high surface area catalyst. For these reasons

knowing surfactant solubility in supercritical media is important.

The solubility of surfactants tert-octylphenoxypolyethoxyethanol (commercially

available and hereafter referred to as Triton …

Metacognitive Strategies In A Web-Enhanced Environment: The Effects On Achievement In Problem-Solving For Engineering Undergraduates, Sally A. Zabel

USF Tampa Graduate Theses and Dissertations

This study focused on the effects of using metacognitive strategy cuing integrated into problem-solving activities in a web-based learning environment. Purposes of the study were to investigate: (a) differences in posttest achievement between students who received metacognitive strategies embedded as cues in engineering problem sets and students who did not receive the treatment; (b) differences in perceptions of problem-solving skills between students who received metacognitive strategies embedded as cues in engineering problem set and students who did not receive the treatment; (c) differences in thermodynamics knowledge; (d) problem-solving steps students reported using across problem sets; (e) characteristics of sampled students, …

Historical Morphodynamics Of John’S Pass, West-Central Florida, Jennifer Rose Krock

USF Tampa Graduate Theses and Dissertations

John’s Pass is a stable mixed-energy inlet located on a microtidal coast in Pinellas County, Florida. It is hydraulically connected to the northern portion of Boca Ciega Bay. Morphological analysis using a time-series of aerial photographs indicated that anthropogenic activities have influenced the evolution of the tidal deltas and adjacent shorelines at John’s Pass. Previous studies have documented the channel dimensions at the location of the existing bridge and calculated the tidal prism. A chronological analysis of these data yielded an increasing trend in the cross-sectional area at John’s Pass from 1873 to 2001. Anthropogenic activities occurring in Boca …

Adsorption Studies For Arsenic Removal Using Modified Chabazite, Ashutosh S. Vakharkar

USF Tampa Graduate Theses and Dissertations

Arsenic contamination in drinking water has been a cause of serious concerns across the United States as well as throughout the world. Over 70 million people in Eastern India, Bangladesh, Vietnam, Taiwan, and Northern China have been victims of arsenic poisoning. The USEPA has classified arsenic as a Class A carcinogen and recently reduced the Maximum Contaminant Level (MCL) in drinking water from 50ppb to 10ppb. The deadline for all the water utilities to meet this level is 23rd January 2006. To meet those drinking water standards, small water utilities need low cost and effective arsenic removal techniques.

Natural zeolites …

The Relationship Between Plasticity Ratio And Hydraulic Conductivity For Bentonite Clay During Exposure To Synthetic Landfill Leachate, Whitney M. Allen

USF Tampa Graduate Theses and Dissertations

In landfill design, the containment of solid and liquid contaminant is essential. Leachate is produced from the biodegradation of the waste with the migration of liquid including rain-water through the heap. This liquid can become a health hazard if it leaches into the groundwater. Liners are placed beneath leachate collection systems to prevent leachate from seeping into the soil underneath the landfill.

Compacted clay liners, usually containing bentonite clay, are widely used. Bentonite can be characterized by its low hydraulic conductivity and high swell potential. With a low hydraulic conductivity, the liner can serve as a barrier. The high swell …

A Methodology For Developing A Nursing Education Minimum Dataset, Aziza A. Rajab

USF Tampa Graduate Theses and Dissertations

Globally, health care professionals, administrators, educators, researchers, and informatics experts have found that minimum dataset and taxonomies can solve the problem of data standardization required in building an information system to advance disciplines body of knowledge. Disciplines continuously gather complex data, but data collected without an organizational context does not increase the knowledge-base. Therefore, a demand exists for developing minimum dataset, controlled vocabularies, taxonomies, and classification systems. To fulfill nursings needs for standardized comparable data, two minimum dataset are used in nursing for organizing, classifying, processing, and managing information for decision-making and advancing clinical nursing knowledge.

No minimum dataset in …

A Study In The Relationships Between Organizational Structures And Public Relations Practitioner Roles, Allison Stokes

USF Tampa Graduate Theses and Dissertations

While there exists extensive research in the area of public relations roles, as well as the arena of organizational structure, little research focuses on the relationship between organizational structure and the role of the public relations practitioner in the organization.

This study will provide a review of the different types of organizational structures, as well as a review of public relations practitioner roles. Organization theory literature supplies information on the characteristics of each structure, including levels of complexity and decentralization involved in each organizational type. Public relations literature includes research that aids in formulation of role classifications that may be …

Comparison Of The Use Of Single And Multiple Oxidants On The Generation Of Particulate Matter In Water Distribution Systems Derived From Groundwater Sources Containing Hydrogen Sulfide And Dissolved Organics, Rochelle J. Minnis

USF Tampa Graduate Theses and Dissertations

Due to increasingly stringent regulations, concerns about disinfection byproduct formation, and the need for improved control of distribution system water quality, there has been a shift towards the use of alternative disinfectants and oxidants in the production of drinking water. Technologies that modify water chemistry, such as hydrogen peroxide, UV irradiation, chlorine and/or chloramines may result in the generation of mineral and organic precipitates. Turbidity provides an indirect measure of the presence of particles by evaluating the light scattering properties of water. Turbidity levels are currently not monitored or regulated in treated groundwater.

An important water quality parameter that influences …

Practical Behavioral Modeling Technique Of Power Amplifiers Based On Loadpull Measurements, Jiang Liu

USF Tampa Graduate Theses and Dissertations

Accurate linear and nonlinear models for devices and components are essential for successful RF/microwave computer aided engineering (CAE). The modeling techniques can be categorized in different levels based on the abstraction of the model as well as the application of the models at various design phases. This dissertation deals with behavioral modeling techniques for nonlinear RF components, especially amplifiers.

There is an increasing demand for accurate behavioral models of RF and microwave components, or integrated circuit (IC) blocks used in wireless system designs. Accurate behavioral models help designers evaluate and select the appropriate components at simulation phase, thereby cutting development …

Safety Effects Of Left Turn Overflow At Signalized Intersections, Isaac Kwamena Sankah

USF Tampa Graduate Theses and Dissertations

Signalized Intersections on the State Roads in Hillsborough and Pinellas County, Florida with observed left turn lane overflow (spill) were selected for a safety and operational study. The study analyzed the crash data for safety hazards that the situation presents. Crashes within 100 feet from the center line of the crossroad of intersections under study to distances 200 feet beyond the end of the turn lane were chosen for the analysis. Left turn overflow is the situation at the approach of an intersection where left turning vehicles back up from the turn lane into the through traffic lane.

Crashes within …

Arterial Perfusion Detection Method By Synchronous Detection, Yohan Prevot

USF Tampa Graduate Theses and Dissertations

The pressure ulcer is a well-known clinical problem that has plagued many patients in acute-care hospitals and chronic-care facilities. The pressure ulcer has the potential to diminish the quality of a patient's life by hindering the person's physical and emotional well-being. In addition, pressure ulcers are a high-cost problem. Past studies have shown that costs related to the treatment of pressure ulcers have reached 1.335 billion dollars a year in the United States alone.

A pressure ulcer is defined as a lesion created by unrelieved pressure, which causes tissue ischemia and subsequently damages the underlying tissue. This sequence of events …

Development And Implementation Of A Dsp Based Air Detector System To Prevent Embolism During Hemodialysis Therapy, Nhat Nguyen

USF Tampa Graduate Theses and Dissertations

This thesis describes the design of a DSP based air detector system to prevent air embolism during Hemodialysis, which is a treatment option for kidney failure disease. Hemodialysis consists of removing blood from the body, filtering and treating the blood to remove toxic substances such as wastes and fluids, reestablishing proper chemical levels in the blood and returning the processed blood to the body. The functions of hemodialysis are performed through the use of a dialyzer, which is also known as an artificial kidney. During hemodialysis small air bubbles may infiltrate the tubing used during the therapy and combine to …

Use Of Random Subspace Ensembles On Gene Expression Profiles In Survival Prediction For Colon Cancer Patients, Vidya Kamath

USF Tampa Graduate Theses and Dissertations

Cancer is a disease process that emerges out of a series of genetic mutations that cause seemingly uncontrolled multiplication of cells. The molecular genetics of cells indicates that different combinations of genetic events or alternative pathways in cells may lead to cancer. A study of the gene expressions of cancer cells, in combination with the external influential factors, can greatly aid in cancer management such as understanding the initiation and etiology of cancer, as well as detection, assessment and prediction of the progression of cancer.

Gene expression analysis of cells yields a very large number of features that can be …

A Measurement-Based Admission Control Mechanism For Wireless Local Area Networks, Srinivas Bandi Ramesh Babu

USF Tampa Graduate Theses and Dissertations

As users become more comfortable using IEEE 802.11 Wireless Local Area Networks, the need for quality of service is becoming more important because of the lack of support in current standards and the increase of multimedia traffic over the Internet. The IEEE 802.11 working group has recognized this fact proposing the Enhanced Distributed Channel Access (EDCA), a priority-based distributed scheme meant to provide service differentiation. EDCA relies on either different Arbitrary Interframe Space (AIFS), or Contention Window (CW) parameters, or both to provide service differentiation. In this thesis, a performance evaluation of the EDCA using five different combinations of the …

Scalable Energy-Efficient Location-Aided Routing (Selar) Protocol For Wireless Sensor Networks, George Lukachan

USF Tampa Graduate Theses and Dissertations

Large-scale wireless sensor networks consist of thousands of tiny and low cost nodes with very limited energy, computing power and communication capabilities. They have a myriad of possible applications. They can be used in hazardous and hostile environments to sense for deadly gases and high temperatures, in personal area networks to monitor vital signs, in military and civilian environments for intrusion detection and tracking, emergency operations, etc. In large scale wireless sensor networks the protocols need to be scalable and energy-efficient. Further, new strategies are needed to address the well-known energy depletion problem that nodes close to the sink node …

Bulk Silicon Based Temperature Sensor, Bharath Bethala Kishanlal Premchand

USF Tampa Graduate Theses and Dissertations

A bulk silicon temperature sensor is fabricated in this work. The objective is to develop a low-cost high resolution temperature sensor. The target applications are a Conductivity-Temperature-Depth (CTD) sensor for oceanic applications and a magnetocaloric microcooler.

The properties of silicon are modified by thermal diffusion of gold. Gold is a fast diffuser in silicon and its diffusion contributes to the increase in resistivity of silicon. The addition of gold to n-type silicon creates a negative temperature coefficient device. The effect of the diffusing environment was investigated by diffusing in oxygen and nitrogen ambient at various temperatures. The influence of area …

Reducing Pollutants In Industrial Stormwater Runoff: Improved Water Quality Protection Using Prioritized Facility Regulation, Lindsay M. Griffen

USF Tampa Graduate Theses and Dissertations

Stormwater pollutants originating from industrial facilities can lead to degraded water quality, even in residentially dominated regions of the country. The National Pollutant Discharge Elimination System permit program regulates stormwater pollutants generated at industrial sites using Multi-Sector General Permits (Generic permits) for industrial facilities and a permit requirement for Municipal Separate Storm Sewer System (MS4) operators. All industrial facilities within 11 broad categories of industry are responsible for self-identifying the need to comply with the Generic permit, and subsequently, implementing self-selected pollution prevention strategies. MS4 operators are required to identify and inspect “high risk” industrial and commercial facilities that may …