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Analysis Of Flow In A Spray Nozzle With Emphasis On Exiting Jet Free Surface, Ryan M. Mead Jun 2003

Analysis Of Flow In A Spray Nozzle With Emphasis On Exiting Jet Free Surface, Ryan M. Mead

Graduate Theses and Dissertations

A conical nozzle with two separate inlets within its top plate is analyzed. One of the inlets is in the center of the top plate, which is free to rotate, whereas the other inlet is positioned away from the center. The fluid entering through the outer inlet slot causes the top plate of the nozzle to spin. Several fluids including FC-77, FC-72, FC-87, and Methanol running at different flow rates were investigated to observe the effect that their particular properties have on the geometry of the fluid's free surface exiting the nozzle. Another variation performed was the geometry of ...


Energy And Transient Power Minimization During Behavioral Synthesis, Saraju P. Mohanty Jun 2003

Energy And Transient Power Minimization During Behavioral Synthesis, Saraju P. Mohanty

Graduate Theses and Dissertations

The proliferation of portable systems and mobile computing platforms has increased the need for the design of low power consuming integrated circuits. The increase in chip density and clock frequencies due to technology advances has made low power design a critical issue. Low power design is further driven by several other factors such as thermal considerations and environmental concerns. In low-power design for battery driven portable applications, the reduction of peak power, peak power differential, average power and energy are equally important. In this dissertation, we propose a framework for the reduction of these parameters through datapath scheduling at behavioral ...


A Natural Analogue For Long-Term Passivity, Raymond E. Monson Jun 2003

A Natural Analogue For Long-Term Passivity, Raymond E. Monson

Graduate Theses and Dissertations

Monson ABSTRACT The U.S. Department of Energy (DOE) has been engaged in a viability study for a potential underground geological repository in Yucca Mountain, Nevada. The repository is being designed for disposal of high level nuclear waste. A reference design for the repository has focused on the use of natural and manmade barriers to assure that radionucleide release will not be significant though an extended time period on the order of 10,000 years. The reference design utilizes manmade metallic components that are expected to last for this time period.

The specified metallic materials depend on a phenomenon known ...


Crystal Engineering Of Binary Compounds Containing Pharmaceutical Molecules, Leslie Ann Morales Jun 2003

Crystal Engineering Of Binary Compounds Containing Pharmaceutical Molecules, Leslie Ann Morales

Graduate Theses and Dissertations

The synthesis or the interaction between two or more molecules is known as supramolecular chemistry. The concept of supramolecular chemistry can be applied to the design of new pharmaceutical materials affording new compositions of matter with desirable composition, structure and properties. The design of a two-molecule, or binary, compound using complementary molecules represents an example of an application of crystal engineering. Crystal engineering is the understanding of intermolecular interactions, in the context of crystal packing, in the design of new solid materials. By identifying reliable connectors through molecular recognition or self-assembly, one can build predictable architectures.

The study of supramolecular ...


Brand Loyalty In The Automotive Community: A Case Study On The Chevrolet Corvette, Michele Ann Motichka Jun 2003

Brand Loyalty In The Automotive Community: A Case Study On The Chevrolet Corvette, Michele Ann Motichka

Graduate Theses and Dissertations

This is a qualitative case study conducted to investigate the relationship between consumers who are brand loyal to a certain product and the groups that are formed to bring these enthusiasts together, using the Chevrolet Corvette and its community as a model. Qualitative research lends itself to studying relationships and social situations, in being able to observe and participate in a social context, rather than analyzing it from the outside looking in. By approaching this subject as a case study, an element of flexibility was allowed. This study primarily focuses on one main phenomena, the social groups formed by loyal ...


"Intelligent" Design Of Molecular Materials: Understanding The Concepts Of Design In Supramolecular Synthesis Of Network Solids, Brian D. Moulton Jun 2003

"Intelligent" Design Of Molecular Materials: Understanding The Concepts Of Design In Supramolecular Synthesis Of Network Solids, Brian D. Moulton

Graduate Theses and Dissertations

This work endeavors to delineate modern paradigms for crystal engineering, i.e. the design and supramolecular synthesis of functional molecular materials. Paradigms predicated on an understanding of the geometry of polygons and polyhedra are developed. The primary focus is on structural determination by single crystal x-ray crystallography, structural interpretation using a suite of graphical visualization and molecular modeling software, and on the importance of proper graphical representation in the presentation and explanation of crystal structures. A detailed analysis of a selected series of crystal structures is presented. The reduction of these molecular networks to schematic representations that illustrate their fundamental ...


Dry Sliding Tribological Characteristics Of Hard, Flat Materials With Low Surface Roughness, Subrahmanya Mudhivarthi Jun 2003

Dry Sliding Tribological Characteristics Of Hard, Flat Materials With Low Surface Roughness, Subrahmanya Mudhivarthi

Graduate Theses and Dissertations

This thesis focuses on identifying hard material pairs with low roughness, high coefficient of static friction, high wear resistance and high modulus of elasticity, suitable for sliding in dry friction conditions under a normal load. A wide range of materials including various steels, various coatings on tool steels deposited by various deposition techniques and different ceramics were examined and considered for tribological testing. Procedures and sequences were developed for conducting tribology tests on the material pairs. High endurance - low cycle tests were conducted and based on the performance of material pairs with respect to friction, wear and surface roughness a ...


The Association Of Maternal Pregnancy Complications And Sudden Infant Death Syndrome, Patricia D. Myers Jun 2003

The Association Of Maternal Pregnancy Complications And Sudden Infant Death Syndrome, Patricia D. Myers

Graduate Theses and Dissertations

Sudden Infant Death Syndrome (SIDS) is the third leading cause of infant mortality between birth and the first year of life in the United States. Along with the identification of various maternal risk factors, the role of fetal hypoxia has been hypothesized to be one of many causal factors associated with SIDS. The purpose of this study was to develop a profile of the SIDS infant and assess whether six pregnancy complications consistent with fetal hypoxia were associated with the increased outcome of SIDS. The secondary data analysis of Florida linked birth to death certificate data specific to Hillsborough County ...


Learning Average Reward Irreducible Stochastic Games: Analysis And Applications, Jun, Li Jun 2003

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

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 ...


Evaluation Of A Presentation And Measurement Method For Assessing Activity Preference, Tara L. Lieblein Jun 2003

Evaluation Of A Presentation And Measurement Method For Assessing Activity Preference, Tara L. Lieblein

Graduate Theses and Dissertations

Much research has focused on the development of methods of measuring preference for stimuli. These methods have shown to be an accurate and valid way to identify potential reinforcers. However, these methods have only been conducted with tangible stimuli and have not been extended to non-tangible stimuli or activities, potentially because these types of stimuli are not appropriate for current preference assessment presentation methodologies. This study used a single stimulus presentation preference assessment to identify preferred activities for two adults with developmental disabilities. Two measures (duration of engagement and indices of happiness) were collected to identify preferred stimuli. For both ...


N-Thiolated β-Lactams: Chemistry And Biology Of A Novel Class Of Antimicrobial Agents For Mrsa, Timothy E. Long Jun 2003

N-Thiolated β-Lactams: Chemistry And Biology Of A Novel Class Of Antimicrobial Agents For Mrsa, Timothy E. Long

Graduate Theses and Dissertations

N-Methylthio beta-lactams represent a promising new family of antibacterial agents whose in vitro activity is confined largely to Staphylococcus species, including multidrug-resistant forms of S. aureus. Originally developed in the 1980's for use as synthetic intermediates, N-methylthio beta-lactams have recently been shown in these laboratories to possess intriguing biological properties which are addressed in Chapters I-IV. In terms of the antibacterial activities, the structural features and species specificities exhibited by these compounds are unlike those of any existing family of beta-lactam drugs. The lactams seem to exert their effects intracellularly, requiring passage of the bioactive species through the cellular ...


Semiparametric Estimation Of Unimodal Distributions, Jason K. Looper Jun 2003

Semiparametric Estimation Of Unimodal Distributions, Jason K. Looper

Graduate Theses and Dissertations

One often wishes to understand the probability distribution of stochastic data from experiment or computer simulations. However, where no model is given, practitioners must resort to parametric or non-parametric methods in order to gain information about the underlying distribution. Others have used initially a nonparametric estimator in order to understand the underlying shape of a set of data, and then later returned with a parametric method to locate the peaks. However they are interested in estimating spectra, which may have multiple peaks, where in this work we are interested in approximating the peak position of a single-peak probability distribution. One ...


Inhibitory Effects Of Food Matrices On Inhibition Real-Time Reverse Transcription Polymerase Chain Reaction Detection Of Foodborne Viruses, Kevin Patrick Mcmullen Jun 2003

Inhibitory Effects Of Food Matrices On Inhibition Real-Time Reverse Transcription Polymerase Chain Reaction Detection Of Foodborne Viruses, Kevin Patrick Mcmullen

Graduate Theses and Dissertations

The Centers for Disease Control and Prevention estimated 23,000,000 cases of viral gastroenteritis caused by Norovirus in 2000, 40% of which were transmitted by food including: a variety of fresh produce, cake, deli meats, fruit salad, cheeses and ice. (CDC, 2003). An estimated 83,391 cases of Hepatitis A virus was reported in 2000, of which 5% was attributed to foodborne transmission (CDC, 2003). These figures underscore an urgent need for a method that can isolate virus from a variety of food matrices. The aim of this study was to develop an overall assessment of the inhibitory effects ...


Kinematic Analysis And Evaluation Of Wheelchair Mounted Robotic Arms, Edward Jacob Mccaffrey Jun 2003

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

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 ...


A Comparison Of Meta-Analytic Approaches To The Analysis Of Reliability Estimates, Denise Corinne Mason Jun 2003

A Comparison Of Meta-Analytic Approaches To The Analysis Of Reliability Estimates, Denise Corinne Mason

Graduate Theses and Dissertations

In the last few years, several studies have attempted to meta-analyze reliability estimates. The initial study, to outline a methodology for meta-analyzing reliability coefficients, was published by Vacha-Haase in 1998. Vacha-Haase used a very basic meta-analytic model to find a mean effect size (reliability) across studies. There are two main reasons for meta-analyzing reliability coefficients. First, recent research has shown that many studies fail to report the appropriate reliability for the measure and population of the actual study (Vacha-Haase, Ness, Nilsson and Reetz, 1999; Whittington, 1998; Yin and Fan, 2000). Second, very little research has been published describing the way ...


Chess: A Tool For Cdfg Extraction And High-Level Synthesis Of Vlsi Systems, Ravi K. Namballa Jun 2003

Chess: A Tool For Cdfg Extraction And High-Level Synthesis Of Vlsi Systems, Ravi K. Namballa

Graduate Theses and Dissertations

In this thesis, a new tool, named CHESS, is designed and developed for control and data-flow graph (CDFG) extraction and the high-level synthesis of VLSI systems. The tool consists of three individual modules for:(i) CDFG extraction, (ii) scheduling and allocation of the CDFG, and (iii) binding, which are integrated to form a comprehensive high-level synthesis system. The first module for CDFG extraction includes a new algorithm in which certain compiler-level transformations are applied first, followed by a series of behavioral-preserving transformations on the given VHDL description. Experimental results indicate that the proposed conversion tool is quite accurate and fast ...


Design And Characterization Of Multi-Layer Coplanar Waveguid[E] Baluns And Inductors, Khaled Obeidat Jun 2003

Design And Characterization Of Multi-Layer Coplanar Waveguid[E] Baluns And Inductors, Khaled Obeidat

Graduate Theses and Dissertations

This work examined the design and characterization of multilayer coplanar waveguide baluns and inductors. This work derives a design procedure that helps RF engineers design cost effective multilayer coplanar waveguide (CPW) spiral balun that works in the frequency range 1-8 GHz. The accuracy of the developed procedure has been proven by designing two balun circuits of different dimensions and simulating them using available commercial software, Momentum (MoM) and Empire (FDTD). The simulation results have shown good balun performance over the desired frequency range. Furthermore some of the designed balun circuits have been fabricated and measured and the results agree with ...


An Examination Of Modulation Of Feeding Behavior In The Nurse Shark Ginglymostoma Cirratum (Bonaterre 1788), Michael Matott Jun 2003

An Examination Of Modulation Of Feeding Behavior In The Nurse Shark Ginglymostoma Cirratum (Bonaterre 1788), Michael Matott

Graduate Theses and Dissertations

The ability of an organism to modulate its feeding behavior is an important focus of feeding ecology studies. Modulation is the ability to distinctly and consistently alter a behavior to accommodate different stimuli. The goal of this study was to examine the ability of the nurse shark Ginglymostoma cirratum to modulate its food capture behavior with different sizes and types of food items. This was carried out through kinematic and electromyographic analysis. Eight sub-adult specimens of G. cirratum were filmed feeding on two different food types (squid and fish) and sizes (gape size and larger than gape size). Filming consisted ...


Optimizing Long-Term Retention Of Abstract Learning, Danielle Mazur Jun 2003

Optimizing Long-Term Retention Of Abstract Learning, Danielle Mazur

Graduate Theses and Dissertations

In a distributed learning strategy, study time is spread across multiple study sessions, without increasing total study time. The benefits of distributed practice, also known as spaced practice, on learning of rote-memory tasks (e.g., spelling, addition, and cued-recall of word pairs) are well known. However, few researchers have looked at the effects of distributed practice on the learning of abstract materials (e.g., physics problems, logical deductions, and algebra). We examined the effects of distributed practice on learning the abstract task of matrix multiplication. In Experiment 1, we taught participants matrix multiplication in either a massed (i.e., 0-day ...


Count Or Pointcount: Is Percent Octocoral Cover An Adequate Proxy For Octocoral Abundance?, Matthew J. Lybolt Jun 2003

Count Or Pointcount: Is Percent Octocoral Cover An Adequate Proxy For Octocoral Abundance?, Matthew J. Lybolt

Graduate Theses and Dissertations

The Florida Keys Coral Reef Monitoring Project (CRMP) began video transect sampling in 1996 and has continuously monitored 107 Florida Keys stations through 2002. The video was downward pointing and produced images from which planar projection data were calculated to determine percent cover of living benthic organisms. An absence of data assessing correlation between octocoral percent cover and octocoral abundance motivated a study to compare octocoral percent cover with abundance data acquired from the same video transects. The methods employed to extract octocoral abundance data from videotape were validated. Temporal changes in octocoral abundance, size and taxonomic group were determined ...


Silhouette Based Gait Recognition: Research Resource And Limits, Laura Helena Malavã© Jun 2003

Silhouette Based Gait Recognition: Research Resource And Limits, Laura Helena Malavã©

Graduate Theses and Dissertations

As is seen from the work on gait recognition, there is a de-facto consensus about the silhouette of a person being the low-level representation of choice. It has been hypothesized that the performance degradation that is observed when one compares sequences taken on different surfaces, hence against different backgrounds, or when one considers outdoor sequences is due to the low silhouette quality and its variation. If only one can get better silhouettes the perfomance of gait recognition would be high. This thesis challenges that hypothesis. In the context of the HumanID Gait Challenge problem, we constructed a set of ground ...


Cvd Growth Of Sic On Novel Si Substrates, Rachael L. Myers Jun 2003

Cvd Growth Of Sic On Novel Si Substrates, Rachael L. Myers

Graduate Theses and Dissertations

Silicon Carbide has been a semiconductor material of interest as a high power and temperature replacement for Silicon (Si) in harsh environments due to the higher thermal conductivity and chemical stability of SiC. The cost, however, to produce this material is quite high. There are also defects in the substrate material (SiC) that penetrate into the active devices layers which are known device killers. Silicon is a material that provides a low cost substrate material for epitaxial growth and does not contain the defects that SiC substrates have. However, the large (~22%) lattice mismatch between Si and SiC creates dislocations ...


The Bases Of Opposition To Affirmative Action: An Attitude Change Effort, Meisha-Ann Martin Jun 2003

The Bases Of Opposition To Affirmative Action: An Attitude Change Effort, Meisha-Ann Martin

Graduate Theses and Dissertations

The present study examined the effects of perceptions of fairness, prejudice and collective self-interest on the affirmative action attitudes of 85 White undergraduate students. Participants were classified as non-racists, modern racists or old-fashioned racists based on their scores on the Implicit Association Test and Attitudes Toward Blacks scale. In the first phase of the study, participants read affirmative action information preceded by either high or low attention instructions. In the second phase, fairness, status of position and race of the target of an affirmative action plan were manipulated using vignettes. No significant differences were found in the first phase of ...


A Model For The Benefits Of Electronic Toll Collection System, Rajesh H. Chaudhary Jun 2003

A Model For The Benefits Of Electronic Toll Collection System, Rajesh H. Chaudhary

Graduate Theses and Dissertations

Due to the degree of complexity related to measuring the advantage of establishing Electronic Toll Collection (ETC) systems, literature generally stops short of modeling an all-inclusive set of benefits of the system. In this research, a model that incorporates the impact on both the users and the society as a whole and evaluates the financial benefits over the lifespan of the ETC investment is developed. Most of the values for the parameters used for calculating the benefits are taken from Federal Highway Administration (FHWA) and from similar studies conducted by transportation agencies, which is the setting that has motivated the ...


The Experience Of Loss Of Voice In Adolescent Girls: An Existential-Phenomenological Study, Deborah Ann Cihonski Jun 2003

The Experience Of Loss Of Voice In Adolescent Girls: An Existential-Phenomenological Study, Deborah Ann Cihonski

Graduate Theses and Dissertations

ABSTRACT The purpose of this study was to examine the meaning of the Loss of Voice experience in adolescent girls using an existential-phenomenological interview approach. An open-ended interview was conducted and participants were asked to "Please think of a specific time when you had something important to say, but did not say it. In as much detail as possible, describe that experience."

Each interview was tape-recorded, transcribed by the investigator, and then independently thematized (Jones, 1984) by the author and a doctoral colleague trained in Jones' (1984) analysis method. Interrater reliability of the themes reached 96% agreement for the overall ...


Empirical Mass Balance Calibration Of Analytical Hydrograph Separation Techniques Using Electrical Conductivity, Joseph A. Cimino Jun 2003

Empirical Mass Balance Calibration Of Analytical Hydrograph Separation Techniques Using Electrical Conductivity, Joseph A. Cimino

Graduate Theses and Dissertations

Analytical baseflow separation techniques such as those used in the automated hydrograph separation program HYSEP rely on a single input parameter that defines the period of time after which surface runoff ceases and all streamflow is considered baseflow. In HYSEP, this input parameter is solely a function of drainage basin contributing area. This method cannot be applied universally since in most regions the time of surface runoff cessation is a function of a number of different hydrologic and hydrogeologic basin characteristics, not just contributing drainage area. This study demonstrates that streamflow conductivity can be used as a natural tracer that ...


The Effect Of Digital Technology On Late 20th Century And Early 21st Century Culture, Jennifer, Clarke Jun 2003

The Effect Of Digital Technology On Late 20th Century And Early 21st Century Culture, Jennifer, Clarke

Graduate Theses and Dissertations

Recently, artists have begun using digital technology to create new cultural forms in the fields of art, literature, and music, and a new cultural form known as interactive digital multimedia has emerged, which combines elements from the new artistic, literary, and musical forms. Many of these artists have produced works that explore the interactive capabilities of digital technology. These interactive digital cultural forms have encouraged collaborative efforts that would have otherwise been difficult or even impossible to achieve before the advent of digital technology. In addition, this element of interactivity has redefined the traditional relationship between artist and audience. As ...


Congurence Among Mathematics Skills Used On The Job By Practical Nurses Vs. The Prerequisite Skills Required For Admission Into The Practical Nursing Program, G H. Clary Jun 2003

Congurence Among Mathematics Skills Used On The Job By Practical Nurses Vs. The Prerequisite Skills Required For Admission Into The Practical Nursing Program, G H. Clary

Graduate Theses and Dissertations

The standard for evaluating a student's mathematic ability (grade level) for admission to many vocational-technical programs is through the administration of the Tests of Adult Basic Education (TABE). There has come forth a concern from vocational educators, that students entering programs may not be prepared for the mathematics required by the curriculum, even though the student has met the criteria for entry as established by the state curriculum frameworks as evidenced by their scores on a TABE which had recently been administered. Furthermore, questions raised among instructional, administrative and guidance personnel about the congruence of math skills required on ...


Small And Large Signal Modeling Of Mm-Wave Mhemt Devices, William, Clausen Jun 2003

Small And Large Signal Modeling Of Mm-Wave Mhemt Devices, William, Clausen

Graduate Theses and Dissertations

ABSTRACT This research effort advances millimeter-wave transistor modeling in a current RF/Microwave circuit simulator (Agilent's Advanced Design System-ADS) for small-signal noise and large signal simulations. The device modeled is a metamorphic High Electron Mobility Transistor (mHEMT) supplied by Raytheon RF components. Because of their structure, these new low noise devices are used in this work to test the abilities to accurately model in the sub 0.5dB noise figure territory and to study model prediction into W-band (75-110 GHz). New modeling issues discussed in this thesis involve the effects of noise modeling in relation to the small-signal model ...


A Novel Normal-To-Plane Space Efficient Micro Corner Cube Retroreflector With Improved Fill Factor, Rahul Agarwal Jun 2003

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

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 ...