View All Items

Title: The Effect of Flexibility and Aspect Ratios on Ribbon-Fin-Propulsion.
Creator: Liu, Hanlin, Taylor, Bevan, Lashaw, Evan, Graduate College, Curet, Oscar M.
Abstract/Description: Ribbon-fin-based propulsion has the potential to improve the maneuverability of underwater vehicles in complex environments. In this type of propulsion a series of rays are used to send traveling waves along an elongated fin, which is referred to as ribbon fin. In this work, in order to know the effect of flexural rigidities and aspect ratios on undulating ribbon fin propulsion; we built a robotic ribbon fin, and tested the physical model in a water flume. In a series of experiments we...
Show moreRibbon-fin-based propulsion has the potential to improve the maneuverability of underwater vehicles in complex environments. In this type of propulsion a series of rays are used to send traveling waves along an elongated fin, which is referred to as ribbon fin. In this work, in order to know the effect of flexural rigidities and aspect ratios on undulating ribbon fin propulsion; we built a robotic ribbon fin, and tested the physical model in a water flume. In a series of experiments we measured the propulsive force, power consumption and the free-swimming speed of the robotic fin as a function of wave frequency for fins with different ray stiffness and aspect ratios. The propulsive performance of the robotic ribbon fin was based on the propulsive force generated and power consumption. A series of kinematic experiments were performed using a high-speed camera. Based on the fin kinematics, the natural frequencies of the ribbon fin with different stiffness were determined. We found that the flexible rays would improve or worsen the propulsive performance compared to a rigid counterpart depending on the actuation parameters. For the aspect ratios considered, the propulsive efficiency improves with increase in the fin height. Our data suggest that, the ribbon fin can yield best propulsive behavior close to its natural frequency.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005881
Format: Document (PDF)

Title: Revisiting Bresse-Timoshenko theory for beams.
Creator: Hache, Florian, Elishakoff, Isaac, Challamel, Noël, Graduate College
Abstract/Description: In this study, a variational derivation of the simpler and more consistent version of Bresse-Timoshenko beams equations, taking into account both shear deformation and rotary inertia in vibrating beams, is presented. Whereas Timoshenko gets his beam equations in terms of the equilibrium, the governing equations and the boundary conditions are here derived using the Hamilton’s principle. First, a list of the different energy contributions is established, including the shear effect and the...
Show moreIn this study, a variational derivation of the simpler and more consistent version of Bresse-Timoshenko beams equations, taking into account both shear deformation and rotary inertia in vibrating beams, is presented. Whereas Timoshenko gets his beam equations in terms of the equilibrium, the governing equations and the boundary conditions are here derived using the Hamilton’s principle. First, a list of the different energy contributions is established, including the shear effect and the rotary inertia. Second, the Hamilton’s principle is applied demanding the stationary of an appropriate functional, leading to two different equations of motion. The resolution of these equations provides the governing differential equation. It turns out that an additional term appears. The derived equations are intended for dynamic stability applications. Specifically, the parametric vibrations will be studied when the axial force varies periodically. This problem has important aerospace applications.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005880
Format: Document (PDF)

Title: Paleoenvironmental Reconstruction at the Jupiter Inlet I Site: An Archaeomalacological Approach.
Creator: Green, Jennifer, Graduate College
Abstract/Description: For several decades, archaeologists have studied the utilization of marine, estuarine, and riverine resources by Florida’s prehistoric people. Looking into the past to see how prehistoric people utilized their environment helps to lend insight into the effects on human and non-human populations. My research aims to reconstruct the environmental habitat zones present at the Jupiter Inlet I Site at the time of occupation based upon the molluscan, or shellfish, species identified. Furthermore, I...
Show moreFor several decades, archaeologists have studied the utilization of marine, estuarine, and riverine resources by Florida’s prehistoric people. Looking into the past to see how prehistoric people utilized their environment helps to lend insight into the effects on human and non-human populations. My research aims to reconstruct the environmental habitat zones present at the Jupiter Inlet I Site at the time of occupation based upon the molluscan, or shellfish, species identified. Furthermore, I will show preliminary data from archaeological excavations in order to determine whether there are changes in the kinds and quantities of molluscan species through time at this archaeological site.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005879
Format: Document (PDF)

Title: A Robust Converse Lyapunov Theorem for Systems with Disturbances Taking Values in a Banach Space.
Creator: Gallolu Kankanamalage, Hasala Senpathy, Wang, Yuan, Graduate College
Abstract/Description: This paper presents a converse Lyapunov theorem for robust global asymptotic stability. The main result extends previous converse Lyapunov theorems to systems with disturbances taking bounded values in an arbitrary Banach space.
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005878
Format: Document (PDF)

Title: Summary of Findings from a Case Study of Policy Entrepreneurship in Higher Education: A Descriptive Portrait.
Creator: Felsher, Rivka A., Graduate College
Abstract/Description: The call for higher education reform in the U.S. intensifies as the gap between the haves and have-nots widens. Policy actors from across the political spectrum advocate for various policy solutions creating a policy environment that is complex and often contentious. In such environments, policy entrepreneurs— those individuals who advocate for policy innovation from within and without government—try to break through the barriers of incremental politics to create reform. As important as this...
Show moreThe call for higher education reform in the U.S. intensifies as the gap between the haves and have-nots widens. Policy actors from across the political spectrum advocate for various policy solutions creating a policy environment that is complex and often contentious. In such environments, policy entrepreneurs— those individuals who advocate for policy innovation from within and without government—try to break through the barriers of incremental politics to create reform. As important as this role is in structuring higher education policy, it has not yet been explored. This study fills a gap in the extant literature by cataloging the traits, values, motivation, skills, and strategies that enable higher education policy entrepreneurs at state and national levels to accomplish sustainable and innovative higher education reform. This study employed a descriptive, revelatory, singlecase study research design interpreted from the postpositivist paradigm. Data drawn from interviews with 23 policy entrepreneurs from across the U.S. were triangulated with document reviews and a multi-level coding strategy. Data were then juxtaposed against nine propositions extracted from the extant literature to derive the findings. Policy entrepreneurs in this study are creative political leaders with a passion for improving educational opportunity. They are pragmatic, resourceful, perseverant, strategic, and influential actors who don’t work in isolation; rather, they are network dependent and value collaboration, compromise, and listening. They reach across the aisle, work hard to build credibility and trust, recognize windows of opportunity, create opportunities to advocate for policy innovation, take calculated risks, and make sacrifices for their cause.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005877
Format: Document (PDF)

Title: Impact of Vitamin C on Genistein induced apoptosis in treatment of prostate cancer cells.
Creator: Famuyiwa, Toluleke, Boe, Andrew, Esiobu, Nwadiuto, Graduate College, Kumi-Diaka, James
Abstract/Description: Background: Prostate Cancer, in the absence of skin cancer, is the most prevalent type of cancer found in the male population. Reactive Oxygen Species (ROS) can promote cancer cell proliferation when they are at elevated levels. Vitamin C is a water-soluble antioxidant capable of inhibiting the formation of ROS. Genistein, an isoflavone found in plants, also possesses the ability to inhibit ROS formation. Objective To determine the potential therapeutic synergy between genistein and vitamin C...
Show moreBackground: Prostate Cancer, in the absence of skin cancer, is the most prevalent type of cancer found in the male population. Reactive Oxygen Species (ROS) can promote cancer cell proliferation when they are at elevated levels. Vitamin C is a water-soluble antioxidant capable of inhibiting the formation of ROS. Genistein, an isoflavone found in plants, also possesses the ability to inhibit ROS formation. Objective To determine the potential therapeutic synergy between genistein and vitamin C and investigate mechanism of action of genistein and/or vitamin C. Methods: Trypan blue assay was carried out to know the % of viable cells. Varying concentrations of genistein with a constant concentration of Vitamin C was used to treat LNCaP cells. After treatment of the cells with genistein and Vitamin C, MTT assay of the cancer cells was performed and absorbance read through an ELISA reader. This gives the values needed for interpreting cell viability after treatment. A statistical analysis performed to determine whether the obtained results are statistically significant. Results: The results obtained from our experiments are inconclusive with regards to the impact of Vitamin C on apoptotic cancer cell death following genistein treatment. However the combination of genistein and vitamin C was more efficient in tumor suppression than when the drugs were given separately. Conclusion: This study suggests that treatment of prostate cancer using genistein can be enhanced by adjuvant treatment with vitamin C. This study is of potential clinical success in reducing the cell death by necrosis.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005876
Format: Document (PDF)

Title: Repairing spherical aberration during in vivo two-photon imaging.
Creator: Estrada, Gerardo, Schummers, James, Graduate College
Abstract/Description: In vivo two photon microscopy generally requires a cranial window implant to aid in stabilization of the brain. These windows introduce aberration into the optical excitation, due to the use of glass coverslips and other media with different refractive index than that for which the microscope objective is designed. These mismatches introduce spherical aberration which can have dramatic effects on the axial pointspread function psf. We have developed a framework for computational simulations...
Show moreIn vivo two photon microscopy generally requires a cranial window implant to aid in stabilization of the brain. These windows introduce aberration into the optical excitation, due to the use of glass coverslips and other media with different refractive index than that for which the microscope objective is designed. These mismatches introduce spherical aberration which can have dramatic effects on the axial pointspread function psf. We have developed a framework for computational simulations of typically used configurations including up to five media interfaces, as a means to understand the impact of spherical aberration, and to search for experimental solutions to correct for it. Our simulations suggest that spherical aberration even from a single glass coverslip ~170 microns can introduce a substantial loss of z-axis resolution, and blurring of signals from neighboring neural elements. We propose the use of opposite refractive index mismatch to correct for spherical aberration. Our simulations suggest that an appropriate magnitude of opposite refractive index can almost fully recover the ideal psf, and our experimental tests support these simulations.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005875
Format: Document (PDF)

Title: Covering Small Alternating Groups with Proper Subgroups.
Creator: Epstein, Michael, Kappe, Luise-Charlotte, Magliveras, Spyros S., Graduate College, Popova, Daniela
Abstract/Description: Any group with a finite noncyclic homomorphic image is a finite union of proper subgroups. Given such a group G, we define the covering number of G to be the least positive integer m such that G is the union of m proper subgroups. We present recent results on the determination of the covering numbers of the alternating groups on nine and eleven letters.
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005874
Format: Document (PDF)

Title: Use Of Molecular Techniques To Understand The Spatial And Temporal Features Of The Oceanic Stage In Hawksbill Sea Turtles, Eretmochelys Imbricata; A Thesis Proposal.
Creator: Coppenrath, Christina, Salmon, Michael, Graduate College
Abstract/Description: For highly migratory species, it is important to understand what habitats are used and what requirements are essential for growth and development. These migrations often span different political and regulatory boundaries, complicating conservation strategies. The hatchlings and post-hatchlings of most sea turtle species migrate to oceanic habitats where they remain for several years before returning to shallow developmental habitats. For critically endangered hawksbill turtle, Eretmochelys...
Show moreFor highly migratory species, it is important to understand what habitats are used and what requirements are essential for growth and development. These migrations often span different political and regulatory boundaries, complicating conservation strategies. The hatchlings and post-hatchlings of most sea turtle species migrate to oceanic habitats where they remain for several years before returning to shallow developmental habitats. For critically endangered hawksbill turtle, Eretmochelys imbricata, most research has concentrated on nesting ecology and very little is known about the posthatchling migration. Many sea turtles then spend years in different foraging habitats before reaching sexual maturity, and such foraging grounds typically represent a mixed stock of turtles from different nesting beaches. Mitochondrial DNA analysis can be used to estimate genetic stock structure of mixedstock foraging populations for sea turtles, and the duration of the post-hatchling oceanic stage can be estimated using stable isotope analysis and satellite telemetry. Our objectives are to determine the duration of the post-hatchling oceanic stage of development, to determine if the turtles sampled in a particular foraging habitat represent a biased or unbiased assortment of matrilineages, and to infer potential migratory pathways by investigating ocean currents between nesting beaches and the foraging site. Here we discuss our methods, to determine the duration of the post-hatchling oceanic stage and stock structure for immature hawksbills at a developmental foraging ground.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005873
Format: Document (PDF)

Title: Dosimetric Consequences From Minimal Displacements In Abpi With Savi Applicators.
Creator: Chandrasekara, Shereen, Pella, Silvia, Leventouri, Theodora, Graduate College
Abstract/Description: Purpose: To highlight the importance of provide proper solid immobilization initially and in every treatment in ABPI with brachytherapy. Materials and Methods: 100 patients receiving brachytherapy treatments in ABPI using the Savi applicators were considered for the study. The CT scans used in the initial plan was compared with every scan obtained before each treatment. Each of these scans were exported in the planning system and registered with the initial plan. Dosimetric evaluations were...
Show morePurpose: To highlight the importance of provide proper solid immobilization initially and in every treatment in ABPI with brachytherapy. Materials and Methods: 100 patients receiving brachytherapy treatments in ABPI using the Savi applicators were considered for the study. The CT scans used in the initial plan was compared with every scan obtained before each treatment. Each of these scans were exported in the planning system and registered with the initial plan. Dosimetric evaluations were performed with their consequences to the ribs and the skin surface. Results: Making the dosimetric comparison for the critical points on the ribs and skin due to very small changes in the interfractionation position revealed dramatic differences in the maximum dose to these critical organs. The cavity's volume manifested changes between fractions as well as the distances to the two critical organs. Therefore the maximum dose manifested variance between 10 and 32 in both of the sites Conclusions: This study demonstrates that using CT scan before each treatment will minimize the risk of delivering undesired high doses to the critical organs. This reveals the urgent need of increasing and improving the immobilization methods when treating ABPI with Savi. In 30 of the cases re-planning was necessary between fractions therefore we conclude that in each case the treatment and planning teams must be prepared for re-plan as needed.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005872
Format: Document (PDF)

Title: Engaging Eats: The Impact of Cuisine on the Tourist Immersion Experience in a Theme Park Setting.
Creator: Broemel, Erin T., Graduate College
Abstract/Description: Each year over 300 million people visit theme parks, making them the major vacation destination worldwide. Theme parks are known for their elaborate spectacle, the creation of artificial realities through intricate immersive experiences including costumed characters, stage shows, and extravagant decor. A unique avenue of research, themed spaces are becoming of greater interest to scholars particularly in regards to the authenticity of the experience and the creation of a hyperreality. Though...
Show moreEach year over 300 million people visit theme parks, making them the major vacation destination worldwide. Theme parks are known for their elaborate spectacle, the creation of artificial realities through intricate immersive experiences including costumed characters, stage shows, and extravagant decor. A unique avenue of research, themed spaces are becoming of greater interest to scholars particularly in regards to the authenticity of the experience and the creation of a hyperreality. Though many aspects of the theme park experience have been reviewed, little focus has been given to the role of food in the overall immersion, particularly how food extends the spectacle theme into a created reality. This study examines the function of food within a highly immersive theme park setting, and how it contributes to the spectacle. Research was conducted from December 2014 to February 2015 at The Wizarding World of Harry Potter, Universal Orlando Resort. A total of 363 survey responses and 21 semi-structured interviews were collected. Themed food was found to further immerse the guest in the themed experience, though visual cues remained the primary sensory stimulus. However, guests considered the location to be more authentic when coupled with a themed food item, as opposed to a generic food choice. This study determined that themed food functions as an extension of the spectacle by means of maintaining the illusion, and contributes to the overall exhibition of the themed space. Further research is needed to understand the overall function theme parks serve to society.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005871
Format: Document (PDF)

Title: Are Attachment Strategy and the Quality of infant care Moderated by Cortisol? A study on the attachment strategies from the Dynamic Maturation Model to attachment development.
Creator: Boklaga, Susan, Frain, Michael, Sperry, Len, Graduate College, Jones, Nancy Aaron
Abstract/Description: Attachment strategies are patterns of attachment that develop over the lifespan, and provide a description of interpersonal behavior along with a functional system for diagnosing psychopathology. Genetic factors, in the context of development and the environment regulate the maturation process. As the brain matures, it synthesizes past memories with present experiences in order to judge the behavior of others in future relationships. This is significant because the purpose of the attachment...
Show moreAttachment strategies are patterns of attachment that develop over the lifespan, and provide a description of interpersonal behavior along with a functional system for diagnosing psychopathology. Genetic factors, in the context of development and the environment regulate the maturation process. As the brain matures, it synthesizes past memories with present experiences in order to judge the behavior of others in future relationships. This is significant because the purpose of the attachment figure is to provide protection and aid the child in “making sense” of information made available to them. Research in adult psychopathology continues to show a correlation between adult psychopathology, cortisol, and disruptions in the childhood attachment system. This study will examine how the Dynamic Maturation Model theory of attachment strategies influence care that mothers give to their infants, and if cortisol serves as a moderator. The Adult Attachment Interview and Infant Care Index will be administered to mother/infant dyads. Attachment strategies and quality of infant care indicated by both measurements will be coded , correlated, and cortisol measured. If findings indicate a correlation, treatment interventions can be designed for post- postpartum mothers to prevent long term child and adult mental health psychopathology and associated social problems that may have their etiology in childhood.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005870
Format: Document (PDF)

Title: Heat Transfer Characterization of Shell and Tube Heat Exchangers.
Creator: Betancourt, Arturo, Curet, Oscar M., Graduate College
Abstract/Description: Shell-and-tube heat exchangers (STHXs) are a popular choice in the petroleum refining industry, chemical industry, food processing industry and in power generation plants. This kind of heat exchanger is made up of an array of baffles that redirects the working fluid to increase heat transfer. The objective of this work is to understand the underlying physics of the heat transfer in a shell-and-tube heat exchanger and its interconnection to the fluid structure associated with their design....
Show moreShell-and-tube heat exchangers (STHXs) are a popular choice in the petroleum refining industry, chemical industry, food processing industry and in power generation plants. This kind of heat exchanger is made up of an array of baffles that redirects the working fluid to increase heat transfer. The objective of this work is to understand the underlying physics of the heat transfer in a shell-and-tube heat exchanger and its interconnection to the fluid structure associated with their design. This research focuses on the steady state three dimensional analysis of the time averaged turbulent flow and heat transfer characterization of the shell side of a small scale single segmented baffle heat exchanger. The study is carried out using the computational fluid dynamics (CFD) software package ANSYS: FLUENT 15.0 on a hybrid unstructured mesh. The CFD results are then compared against experimental results. The Reynolds averaged-Navier-stokes (RANS) based turbulent model realizable is used to model the turbulence inside the heat exchanger. The results obtained from CFD and experiment from the shell side wall outlet temperature differ by 5 %. Based on the computational results it is found that the regions of highest velocity at the inlet and in the core flow lead to a higher local heat transfer enhancement. A better understanding of the complex flow and heat transfer regimes inside a shell and tube heat exchanger given by this work would aid to further the development of more cost efficient and effective heat exchanger designs.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005869
Format: Document (PDF)

Title: Inhibition of Emotions as a Moderator of the Relationship Between Victimization Experiences and Aggression in Preadolescence.
Creator: Aults, Christopher D., Pauletti, Rachel E., Cooper, Patrick J., Graduate College, Perry, David G.
Abstract/Description: Chronic victimization by peers sometimes fosters aggression in children (Dodge, 2011; Hodges & Perry, 1999). Recent data suggest that cross-gender victimization is more common in girls during middle childhood (Benbenishty, & Astor, 2005). That is, girls are picked on by boys at a proportionally higher rate than boys are picked on by girls. However, the possibility that enduring cognitive structures moderate effects of victimization on aggression—by serving as processing filters through which...
Show moreChronic victimization by peers sometimes fosters aggression in children (Dodge, 2011; Hodges & Perry, 1999). Recent data suggest that cross-gender victimization is more common in girls during middle childhood (Benbenishty, & Astor, 2005). That is, girls are picked on by boys at a proportionally higher rate than boys are picked on by girls. However, the possibility that enduring cognitive structures moderate effects of victimization on aggression—by serving as processing filters through which children perceive, interpret, and respond to the adverse experiences—remains unexplored. In this study, we assessed whether victimization experiences at the hands of the other sex increased aggression over the school year. We measured peer-nominated aggression toward the other sex and victimization by the other sex in 195 children (94 girls, 101 boys; M age 10.1 years). We also examined self-reported inhibition of emotions as a possible moderator. Results suggest that aggression did not increase over time if boys were victimized by other boys, but the more that boys were victimized by girls, the more their aggression increased girls’ aggression was unaffected by victimization by peers of either sex as a main effect. However, inhibition of emotions moderated the effect of victimization on aggression in both sexes. Thus, the experience of being victimized by the other sex led to an increase in aggression toward the other sex only when inhibition of emotions was high, rather than low. These findings highlight the importance of examining interactive models that contribute to aggression in children.
Show less
Date Issued: 2015
PURL: http://purl.flvc.org/fau/fd/FA00005868
Format: Document (PDF)

Title: Evacuation Preparedness Rating System: Evacuation Planning for Vulnerable Poulations.
Creator: Mayorga, Estefania, Renne, John L., Center for Urban and Environmental Solutions
Abstract/Description: Historically, vulnerable populations are disproportionately affected by ineffective evacuation planning. The Evacuation Preparedness Rating System includes five dimensions to assess the evacuation plans of the 50 largest US cities.
Date Issued: 2017
PURL: http://purl.flvc.org/fau/fd/FA00003469
Format: Document (PDF)

Title: Community Breast Screening “Treasure Your Chest”.
Creator: Joji, Lovely, Love, Tamara, Kinlaw, Nakisha, Florida Atlantic University, Christine E. Lynn College of Nursing
Date Issued: 2019
PURL: http://purl.flvc.org/fau/fd/FA00007538
Format: Document (PDF)

Title: Pathogenic Vibrio Bacteria in Mangrove Snapper Meat.
Creator: Brandon McHenry, Gabby Barbarite, Peter J. McCarthy
Abstract/Description: Vibrio have been isolated from the guts and skin of fish from many environments as well as commercial fish products, however it is unknown if these pathogens naturally exist in the meat of foodfish. This study first investigated the association of Vibrio with Mangrove Snapper collected from the Indian River Lagoon to determine if its presence in their meat is natural or a product of contamination. The second part of this study was to identify Vibrio reservoirs within Mangrove Snapper to...
Show moreVibrio have been isolated from the guts and skin of fish from many environments as well as commercial fish products, however it is unknown if these pathogens naturally exist in the meat of foodfish. This study first investigated the association of Vibrio with Mangrove Snapper collected from the Indian River Lagoon to determine if its presence in their meat is natural or a product of contamination. The second part of this study was to identify Vibrio reservoirs within Mangrove Snapper to better understand how they can contaminate the meat during the filleting process. In addition, the effects of temperature abuse (a common food handling issue) and its duration, on Vibrio abundance, were also tested.
Show less
PURL: http://purl.flvc.org/fau/fd/FAUIR000478
Format: Document (PDF)

FAU Graduate Student Research (93)	+ -
FAU College Collections (4)	+ -

Learning and scholarship (1)	+ -
Open access (1)	+ -
Psychology (1)	+ -
Research (1)	+ -
Scholarly communication (1)	+ -

Situations (1)	+ -
Teaching (1)	+ -

text (96)	+ -
poster (1)	+ -

Graduate College (93)	+ -
Leventouri, Theodora (4)	+ -
Wyneken, Jeanette (4)	+ -
Broemel, Erin T. (3)	+ -
Detwiler, Kate M. (3)	+ -

Search In

Pages

Pages

Sort Results By:

Narrow results by:

Collection

Topical Subject

Type of Resource

Language

Creator

Format

Owner