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Title: The microprocessor design team assignment problem with a new multistage stochastic/Brownian motion model.
Creator: O'Grady, Thomas James., Florida Atlantic University, Han, Chingping (Jim), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The Microprocessor Design Team Assignment Problem models the microprocessor design efforts of Intel Corporation over a 29-year period from 1972 until 2001. The basic model is a Erlang queuing system based probability model of the individual programming-design team daily operations. After extensive research the Erlang Loss/Delay Blocked Multiserver Model is utilized throughout the dissertation The Erlang loss-delay model takes into account the Key Man Constraint for team leaders and...
Show moreThe Microprocessor Design Team Assignment Problem models the microprocessor design efforts of Intel Corporation over a 29-year period from 1972 until 2001. The basic model is a Erlang queuing system based probability model of the individual programming-design team daily operations. After extensive research the Erlang Loss/Delay Blocked Multiserver Model is utilized throughout the dissertation The Erlang loss-delay model takes into account the Key Man Constraint for team leaders and programming team personnel. The Microprocessor Design Team Assignment Problem Case Study and massive research effort, into Intel Corporations design efforts, is complicated by modeling a major programming-design team operation without any current data or assistance from Intel Corporation. However much of the lack of assistance and data was obtained by utilizing a critical managerial design team decomposition which answered most major questions about Intels lack of adequate personnel and overutilization of team leaders and asst. team leaders throughout the 48 months of most major design projects. The study-dissertation concludes that Intels and Hewlett Packards current positions in the computer industry are relatively secure because of extremely high entry level costs exceeding $850,000,000.00 million dollars. Many individual issues about programming-design team operations are analyzed in a great amount of detail. This is the first time that much of this design-programming team material and information is being made public for future research and continuing improvement upon large scale project managerial methods and techniques. The basic design-programming team effort is also modeled with Erlang probability models and stochastic Riccati differential equations. This modeling effort is discussed in great detail in chapter 5 and Appendix Alpha. It is believed that this fundamental research leads the way for more advanced efforts in manufacturing systems and possibly mechatronics for further models utilizing strong Markov properties. This research effort substantially advances the basic research and knowledge of Partially Observable Markov Decision Processes and Strong Brownian Motion with the basic unit being strong Markov properties.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/11962
Subject Headings: Brownian motion processes, Stochastic analysis, Microprocessors
Format: Document (PDF)

Title: Spontaneous pattern changes for bistable apparent motion stimuli: Perceptual satiation or memory attraction?.
Creator: Voss, Audrey A., Florida Atlantic University, Hock, Howard S.
Abstract/Description: Subjects judge motion direction for an apparent motion stimulus with competing perceptual organizations: Vertical vs. horizontal motion. The two patterns are coupled. When one is perceptually instantiated the other remains active in memory, resulting in sudden changes in perceived motion direction under constant stimulus conditions. The probability of change from an initially horizontal to a vertical pattern remains constant over time, showing that perceptual satiation is insufficient to...
Show moreSubjects judge motion direction for an apparent motion stimulus with competing perceptual organizations: Vertical vs. horizontal motion. The two patterns are coupled. When one is perceptually instantiated the other remains active in memory, resulting in sudden changes in perceived motion direction under constant stimulus conditions. The probability of change from an initially horizontal to a vertical pattern remains constant over time, showing that perceptual satiation is insufficient to explain the occurrence of spontaneous perceptual changes. It is proposed that spontaneous changes also occur because the pattern active in memory attracts the percept away from the currently instantiated pattern. The attraction hypothesis specifies that the activation of the memory pattern (and hence its attractive strength) increases as a result of previous experience. It is supported by evidence that the likelihood of changing, say from horizontal to vertical motion, is increased if the motion pattern was previously vertical.
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Date Issued: 1991
PURL: http://purl.flvc.org/fcla/dt/14721
Subject Headings: Motion perception (Vision), Perceptual-motor learning
Format: Document (PDF)

Title: Sound generated due to vortical flow past a forward facing step.
Creator: Gundlapalli, Ravishankar., Florida Atlantic University, Dhanak, Manhar R.
Abstract/Description: The sound field associated with the motion of 2-dimensional finite core vortex past a forward facing step is obtained. A numerical scheme using Contour Dynamics technique and incompressible, inviscid equations of motion is developed to determine the evolution of the structure of the vortex, its path over the step and the radiated sound. An appropriate low-frequency Green's function is derived and the expression for the far field acoustic pressure as formulated by Mohring is used. The vortex...
Show moreThe sound field associated with the motion of 2-dimensional finite core vortex past a forward facing step is obtained. A numerical scheme using Contour Dynamics technique and incompressible, inviscid equations of motion is developed to determine the evolution of the structure of the vortex, its path over the step and the radiated sound. An appropriate low-frequency Green's function is derived and the expression for the far field acoustic pressure as formulated by Mohring is used. The vortex structure evolves in the non-uniform flow in the vicinity of the step and under certain conditions is found to undergo significant deformation of its core structure. The far field acoustic pressure is found to be a strong function of vortex motion in the vicinity of the step. Results for the vortex trajectory and the associated acoustic pressure are presented for a variety of flow parameters.
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Date Issued: 1992
PURL: http://purl.flvc.org/fau/fd/FADT14825
Subject Headings: Underwater acoustics, Vortex-motion, Eddies, Hydrodynamics
Format: Document (PDF)

Title: The eyes of the movie.
Creator: Potamkin, Harry Alan, Lerner, Irving
Date Issued: 1934
PURL: http://purl.flvc.org/fcla/DT/352225
Subject Headings: Motion pictures --Moral and religious aspects., Motion pictures --Censorship., Propaganda., Film.
Format: Document (PDF)

Title: Punctuated Identities In Contemporary Italian Cinema.
Creator: Iadevaia, Vincenza, Serra, Haria, Guneratne, Anthony, Florida Atlantic University, Dorothy F. Schmidt College of Arts and Letters, Department of Languages, Linguistic and Comparative Literature
Abstract/Description: At a time of major political disruption in Italy, this dissertation aims to explore the landscape of contemporary Italian Cinema in connection with the nation’s new demographic trends and social configurations. Focusing on a selected, inherently representative group of filmmakers, the current study proposes a new form of film theory that sees the emergence and recognition of multi-ethnic filmmaking in a hitherto largely monocultural context as an indicator of a profound cultural...
Show moreAt a time of major political disruption in Italy, this dissertation aims to explore the landscape of contemporary Italian Cinema in connection with the nation’s new demographic trends and social configurations. Focusing on a selected, inherently representative group of filmmakers, the current study proposes a new form of film theory that sees the emergence and recognition of multi-ethnic filmmaking in a hitherto largely monocultural context as an indicator of a profound cultural transformation rather than a mere aesthetic tendency. The critical terminology I propose, “punctuated identitties,” document the characteristics of contemporary filmmakers, since they cannot be easily defined under the categories established by previous critical vocabularies. While these multi-ethnic filmmakers are part of a larger trend in European filmmaking as a whole, and hence constitute a case study of the evolution of a particular trend within individual national cinemas, my aim is to show how their punctuated identities complicate and color the Italian mediascape, and perhaps add a pluralistic dimension to the most recent chapter in the story of one of the most influential national cinemas. The filmmakers analyzed are selected according to specific elements and not on any categorization as first-and-second-generation immigrants. The present analysis includes two immigrants who have consciously chosen Italy as their homeland (Ferzan Özpetek and Jonas Carpignano), a migrant other who rejects nationality (Laura Halilovic), a political exile who relishes a certain sense of freedom in his Italian sojourn (Fariborz Kamkari), and a naturalized son of immigrants (Suranga Katugampala). All move in a fluid and conceptual space that creates a new path inside the traditional domain of national cinema, establishing the validity of others’s points of views and proving that coexistence can enrich even established and influential art forms.
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Date Issued: 2019
PURL: http://purl.flvc.org/fau/fd/FA00013219
Subject Headings: Cinema, Motion pictures, Italian, Contemporary filmmakers, Motion picture producers and directors--Italy
Format: Document (PDF)

Title: A cultural analysis of children and parenting as portrayed in Hollywood films of the 1990's.
Creator: Wahlberg, Katherine E., Florida Atlantic University, Brown, Susan Love
Abstract/Description: Because the film genre categorized as "family" has become a larger segment of the film industry in the last decade, family films have become an abundant source of cultural information about children and family structure. This study examines from a cognitive perspective how preadolescent children and their parents are portrayed in mainstream Hollywood films during the 1990's, how these film narratives reflect the durability of core cultural models, and elements of negotiation and change. The...
Show moreBecause the film genre categorized as "family" has become a larger segment of the film industry in the last decade, family films have become an abundant source of cultural information about children and family structure. This study examines from a cognitive perspective how preadolescent children and their parents are portrayed in mainstream Hollywood films during the 1990's, how these film narratives reflect the durability of core cultural models, and elements of negotiation and change. The portrayal of family relationships and the conceptualization of a child are affected by cultural models surrounding nurturance, self-reliance, success, nostalgia and the future orientation of our culture. Salient issues include the perceived disintegration of the family and the nature of the relationship between fathers and their children. A significant number of films focus on the family from the father's perspective, emphasizing his need to enrich his life beyond the workplace and develop close familial relationships.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12864
Subject Headings: Children in motion pictures--United States, Family in motion pictures--United States
Format: Document (PDF)

Title: Simulation of autonomous knowledge-based navigation in unknown two-dimensional environment with polygonal obstacles.
Creator: McKendrick, John DeMilly., Florida Atlantic University, Cheng, Linfu, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
Abstract/Description: The problem of finding optimal paths for a robot navigating in an environment where the position of each obstacle is precisely known has received much attention in the literature, however, the majority of applications problems for a robot would require it to navigate in a completely unknown. This paper focuses on an approach to solving the problem of robot navigation in an unknown, unstructured, two-dimensional environment where the positions of the polygonal obstacles were fixed in time. Few...
Show moreThe problem of finding optimal paths for a robot navigating in an environment where the position of each obstacle is precisely known has received much attention in the literature, however, the majority of applications problems for a robot would require it to navigate in a completely unknown. This paper focuses on an approach to solving the problem of robot navigation in an unknown, unstructured, two-dimensional environment where the positions of the polygonal obstacles were fixed in time. Few studies have reported on the utilization of an expert system to govern robot motion. This study relied on a knowledge-based expert system that interacted with lower-level procedures to carry out path finding and exploration functions. The expert-system shell used was OPS5 which ran on top of Lisp.
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Date Issued: 1988
PURL: http://purl.flvc.org/fcla/dt/14496
Subject Headings: Robots--Motion, Expert systems (Computer science), Robots--Motion--Computer simulation
Format: Document (PDF)

Title: THERE’S SOMETHING IN THE WATER: JAWS AND THE ENVIRONMENT.
Creator: Carr, William, Charbonneau, Stephen, Florida Atlantic University, School of Communication and Multimedia Studies, Dorothy F. Schmidt College of Arts and Letters
Abstract/Description: This thesis presents an analysis of Steven Spielberg’s Jaws and the film’s depiction of nature. This analysis will show that the film derives horror from the depiction of nature encroaching on human spaces. Through the film’s depictions of shark attacks, it forces viewers to confront their own edibility. The filmmaking techniques place humans on the other side of the eater/eaten binary, and present humans a prey. Similarly, the depictions of environments show the presence of nature as a...
Show moreThis thesis presents an analysis of Steven Spielberg’s Jaws and the film’s depiction of nature. This analysis will show that the film derives horror from the depiction of nature encroaching on human spaces. Through the film’s depictions of shark attacks, it forces viewers to confront their own edibility. The filmmaking techniques place humans on the other side of the eater/eaten binary, and present humans a prey. Similarly, the depictions of environments show the presence of nature as a disruption to the film’s established visual style. This thesis asserts film analysis as a necessary tool in understanding the nature/culture binary and how film narratives can contribute to this division.
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Date Issued: 2023
PURL: http://purl.flvc.org/fau/fd/FA00014175
Subject Headings: Nature in motion pictures, Motion pictures--Study and teaching, Media studies
Format: Document (PDF)

Title: The Meryl Streep mystique: a study of gender, aging, Hollywood and a female star.
Creator: Allerton, Tracy., Dorothy F. Schmidt College of Arts and Letters, School of Communication and Multimedia Studies
Abstract/Description: This thesis employs a star study of Meryl Streep, incorporating pertinent feminist, reception and culture-studies theories, to investigate biases within the Hollywood film industry. The actress has enjoyed a resurgence as a leading lady at age 61. Streep's star persona, acting prowess and career arc are examined across three theoretical platforms - production of culture, textual analysis, and audience analysis - or clues as to why she has been singled out among her peers. This thesis posits...
Show moreThis thesis employs a star study of Meryl Streep, incorporating pertinent feminist, reception and culture-studies theories, to investigate biases within the Hollywood film industry. The actress has enjoyed a resurgence as a leading lady at age 61. Streep's star persona, acting prowess and career arc are examined across three theoretical platforms - production of culture, textual analysis, and audience analysis - or clues as to why she has been singled out among her peers. This thesis posits that Streep's unique star image and surge in popularity have helped her break out of hegemonic articulations of gender and aging that privilege youthful beauty, putting female stars at a disadvantage within the capitalistic film industry. Also considered is the cultural significance of Streep's late-life success: Does she represent new openings for older actresses (and concomitantly, an increase in film representations of aging women), or is she merely an anomaly within the entrenched patriarchal system?
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2867329
Subject Headings: Criticism and interpretation, Sex role in motion pictures, Women in motion pictures, Middle age in motion pictures, Women in popular culture
Format: Document (PDF)

Title: Effect of wind on near-shore breaking waves.
Creator: Schaffer, Faydra., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The aim of this project is to identify the effect of wind on near-shore breaking waves. A breaking wave was created using a simulated beach slope configuration. Testing was done on two different beach slope configurations. The effect of offshore winds of varying speeds was considered. Waves of various frequencies and heights were considered. A parametric study was carried out. The experiments took place in the Hydrodynamics lab at FAU Boca Raton campus. The experimental data validates the...
Show moreThe aim of this project is to identify the effect of wind on near-shore breaking waves. A breaking wave was created using a simulated beach slope configuration. Testing was done on two different beach slope configurations. The effect of offshore winds of varying speeds was considered. Waves of various frequencies and heights were considered. A parametric study was carried out. The experiments took place in the Hydrodynamics lab at FAU Boca Raton campus. The experimental data validates the knowledge we currently know about breaking waves. Offshore winds effect is known to increase the breaking height of a plunging wave, while also decreasing the breaking water depth, causing the wave to break further inland. Offshore winds cause spilling waves to react more like plunging waves, therefore increasing the height of the spilling wave while consequently decreasing the breaking water depth.
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Date Issued: 2010
PURL: http://purl.flvc.org/FAU/2979378
Subject Headings: Wave motion, Theory of, Ocean waves, Climatology, Computational fluid dynamics
Format: Document (PDF)

Title: Jugular Region: The Triangle of Verisimilitude.
Creator: Laflamme, Bénédicte, Charbonneau, Stephen, Florida Atlantic University, School of Communication & Multimedia Studies, Dorothy F. Schmidt College of Arts and Letters
Abstract/Description: With the short film, Jugular Region, I intended to cross over to the narrative world of filmmaking by developing an idea in sync with experimental filmmaking, special effect makeup and the body-horror genre. Therefore, the purpose of this paper is to expose how, by using an original body-horror genre screenplay as a platform to gather imagery, I was able to fully develop the verisimilitude of the film through SFX makeup and a surrealist editing style. This paper is also dedicated to the step...
Show moreWith the short film, Jugular Region, I intended to cross over to the narrative world of filmmaking by developing an idea in sync with experimental filmmaking, special effect makeup and the body-horror genre. Therefore, the purpose of this paper is to expose how, by using an original body-horror genre screenplay as a platform to gather imagery, I was able to fully develop the verisimilitude of the film through SFX makeup and a surrealist editing style. This paper is also dedicated to the step-by-step thought process and my artistic practice that led to the creation of this unique filmic universe.
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Date Issued: 2019
PURL: http://purl.flvc.org/fau/fd/FA00013385
Subject Headings: Filmmaking (Motion pictures), Experimental films, Film makeup, Horror
Format: Document (PDF)

Title: Seakeeping response of a Surface Effect Ship in near-shore transforming seas.
Creator: Kindel, Michael., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Scale model tests are conducted of a Surface Effect Ship in a near-shore developing sea. A beach is built and installed in a wave tank, and a wavemaker is built and installed in the same wave tank. This arrangement is used to simulate developing sea conditions and a 1:30 scale model SES is used for a series of experiments. Pitch and heave measurements are used to investigate the seakeaping response of the vessel in developing seas. The air-cushion pressure and the vessel speed are varied, and...
Show moreScale model tests are conducted of a Surface Effect Ship in a near-shore developing sea. A beach is built and installed in a wave tank, and a wavemaker is built and installed in the same wave tank. This arrangement is used to simulate developing sea conditions and a 1:30 scale model SES is used for a series of experiments. Pitch and heave measurements are used to investigate the seakeaping response of the vessel in developing seas. The air-cushion pressure and the vessel speed are varied, and the seakeeping results are compared as functions of these two parameters. The experiment results show a distinct correlation between the air-cushion pressure and the response amplitude of both pitch and heave. The results of these experiments are compared against results of a computer model of a Surface Effect Ship (SES).
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Date Issued: 2012
PURL: http://purl.flvc.org/FAU/3355563
Subject Headings: Naval architecture, Fluid dynamics, Wave motion, Theory of, Ships, Hydrodynamics
Format: Document (PDF)

Title: Children attend to intrinsic motions when learning nouns.
Creator: Iglesias, Adam, Florida Atlantic University, Kersten, Alan, Charles E. Schmidt College of Science, Department of Psychology
Abstract/Description: The present research was designed to test whether 3-year-old-English-speaking children preferentially associate novel nouns with intrinsic motion rather than extrinsic motion, as predicted by the theory of Kersten (1998). Intrinsic motion refers to the ways the parts of an object move in relation to one another. In contrast, extrinsic motion refers to the motion of an object as a whole with respect to an external reference point (e.g. another object). In two separate experiments, we...
Show moreThe present research was designed to test whether 3-year-old-English-speaking children preferentially associate novel nouns with intrinsic motion rather than extrinsic motion, as predicted by the theory of Kersten (1998). Intrinsic motion refers to the ways the parts of an object move in relation to one another. In contrast, extrinsic motion refers to the motion of an object as a whole with respect to an external reference point (e.g. another object). In two separate experiments, we demonstrated that nouns are associated with intrinsic motion and verbs are associated with extrinsic motion. Specifically, children were able to detect differences between stimuli paired with novel nouns based on intrinsic motion and stimuli paired with novel verbs based on extrinsic motion. In other words, we shed light on the different motion cues children attend to when learning nouns and verbs. Thus, children utilize motion cues in addition to static characteristics when learning nouns and verbs. Therefore, distinct types of motion information play an important role in the learning of nouns and verbs.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/13270
Subject Headings: Motion, Vocabulary--Study and teaching (Primary), Language acquisition
Format: Document (PDF)

Title: Effect of applied periodic strain on coherent structures in a turbulent boundary layer.
Creator: Neravetla, Bharath Reddy, Florida Atlantic University, Dhanak, Manhar R., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The effect of applied periodic straining field on the behavior of coherent vortical structures in the turbulent boundary layer is studied. In particular, the coherent vortical longitudinal structures in the turbulent boundary layer in the form of isolated vortices or in the form of pairs of counter-rotating vortices is considered. The effect on the pressure fluctuations on the wall due to the applied periodic strain is studied. A numerical method using Contour Dynamics technique and...
Show moreThe effect of applied periodic straining field on the behavior of coherent vortical structures in the turbulent boundary layer is studied. In particular, the coherent vortical longitudinal structures in the turbulent boundary layer in the form of isolated vortices or in the form of pairs of counter-rotating vortices is considered. The effect on the pressure fluctuations on the wall due to the applied periodic strain is studied. A numerical method using Contour Dynamics technique and incompressible, inviscid equations of motion is developed to determine the evolution of these structures in time. The pressure fluctuations on the wall are calculated making use of the unsteady Bernoulli's equation. The various parameters associated with the coherent structures in the turbulent boundary layer such as the strength of the vortices, their distance from the wall, separation distance between counter-rotating vortices, the frequency of the applied straining field, the magnitude of the straining field and the stretching rate are varied to study the resultant pressure fluctuations. It is observed that at low applied frequencies, there are high modulations in the surface pressure fluctuations, and at higher applied frequencies of straining field there is reduction in surface pressure fluctuations in the boundary layer.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15020
Subject Headings: Vortex-motion, Turbulent boundary layer, Pressure--Measurement
Format: Document (PDF)

Title: Experimental study of flow over a bundle of cylinders.
Creator: Khuc, Hiep Hieu., Florida Atlantic University, Su, Tsung-Chow, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The drag reduction by vortex fusion was investigated. A comparison of flow over a bundle of cylinders in uniform and in disturbed currents was performed in a water channel. The model was subjected to cross flow. A thin cylindrical wire located nearby upstream and leveled at half the height of the test model was used as a source of disturbance. A hydrogen bubble technique was utilized to observe the flow pattern. The accumulation of vortices at stagnating regions in front of a bundle of...
Show moreThe drag reduction by vortex fusion was investigated. A comparison of flow over a bundle of cylinders in uniform and in disturbed currents was performed in a water channel. The model was subjected to cross flow. A thin cylindrical wire located nearby upstream and leveled at half the height of the test model was used as a source of disturbance. A hydrogen bubble technique was utilized to observe the flow pattern. The accumulation of vortices at stagnating regions in front of a bundle of cylinders transformed into a counter-rotated curl at leading edges of each leading cylinder in the bundle. Measurements were carried out by a computerized data acquisition system. Drag coefficient measurements, digital spectral and fourier analyses were also performed. Results have shown that a drag reduction can be obtained by introducing a thin cylindrical wire in front of the stagnation.
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Date Issued: 1994
PURL: http://purl.flvc.org/fcla/dt/15026
Subject Headings: Vortex-motion, Fluid dynamics, Cylinders, Fourier transformations, Hydrodynamics
Format: Document (PDF)

Title: Non-linear convection of a vortex sheet past a cascade of airfoils.
Creator: van den Berg, Stanislas Franck., Florida Atlantic University, Glegg, Stewart A. L.
Abstract/Description: The interaction of rotor turbulence with the stator is currently believed to be the predominant mechanism of noise radiation from turbofans in aircraft engines. This thesis presents a general method to compute unsteady 2-D potential flows past a cascade of airfoils. The procedure uses source and vortex distributions on the surface of the airfoils, creation of wakes downstream of the airfoils and non-linear convection of the perturbed flow. These features are designed to satisfy a condition of...
Show moreThe interaction of rotor turbulence with the stator is currently believed to be the predominant mechanism of noise radiation from turbofans in aircraft engines. This thesis presents a general method to compute unsteady 2-D potential flows past a cascade of airfoils. The procedure uses source and vortex distributions on the surface of the airfoils, creation of wakes downstream of the airfoils and non-linear convection of the perturbed flow. These features are designed to satisfy a condition of no-flow through the surface of the airfoils and the Kutta condition at the trailing edge of each of these airfoils. The investigation proves the importance of applying the Kutta condition. It was also shown that an infinite cascade is well approximated by a small number of airfoils and that the non-linear rather than linear convection of vorticity has a large effect on the spectrum of the unsteady lift of an airfoil.
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Date Issued: 1998
PURL: http://purl.flvc.org/fcla/dt/15586
Subject Headings: Vortex-motion, Cascades (Fluid dynamics), Unsteady flow (Fluid dynamics)
Format: Document (PDF)

Title: Tearing of an aligned vortex by a current difference in two-layer quasi-geostrophic flow.
Creator: Parthasarathy, Balaji., Florida Atlantic University, Marshall, Jeffrey S., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A study of two-layer quasi-geostrophic vortex flow is performed to determine the effect of a current difference between the layers on a vortex initially extending through both the layers. In particular, the conditions under which the current difference can 'tear' the vortex are examined. In the first set of flows studied, the current difference is generated by a (stronger) third vortex in the upper layer located at a large distance from the (weaker) vortex under study. A set of flows are also...
Show moreA study of two-layer quasi-geostrophic vortex flow is performed to determine the effect of a current difference between the layers on a vortex initially extending through both the layers. In particular, the conditions under which the current difference can 'tear' the vortex are examined. In the first set of flows studied, the current difference is generated by a (stronger) third vortex in the upper layer located at a large distance from the (weaker) vortex under study. A set of flows are also considered in which an ambient geostrophic current difference is produced by a non-uniform background potential vorticity field. The results of the study will be useful in determining the conditions under which large geophysical vortex structures, such as cyclones and ocean rings, can extend to large depths even though the mean currents in the ambient flow change significantly along the vortex length.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14909
Subject Headings: Vortex-motion, Fluid dynamics, Boundary layer control, Flow visualization
Format: Document (PDF)

Title: Computer Simulation of Charged Particle Trajectories.
Creator: Hogan, William A., Lamborn, Bjorn, Florida Atlantic University
Abstract/Description: A computer analysis is made of the trajectories of charged particles injected tangentially into the mid-plane of a static mirror field. Conditions necessary for the non-adiabatic transfer of particle energy from the plane perpendicular to the field to the direction parallel to the field are discussed. Two distinct mechanisms are observed: (1) When the requirements for parametric resonance are satisfied, energy is absorbed into longitudinal motion; and (2) When the particle exhibits the...
Show moreA computer analysis is made of the trajectories of charged particles injected tangentially into the mid-plane of a static mirror field. Conditions necessary for the non-adiabatic transfer of particle energy from the plane perpendicular to the field to the direction parallel to the field are discussed. Two distinct mechanisms are observed: (1) When the requirements for parametric resonance are satisfied, energy is absorbed into longitudinal motion; and (2) When the particle exhibits the characteristic looping behavior, energy may be transferred between the longitudinal and transverse degrees of freedom. Various numerical methods are employed to integrate the equations of motion. The fourthorder Runge-Kutta Method is found to be the most accurate.
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Date Issued: 1970
PURL: http://purl.flvc.org/fau/fd/FA00000753
Subject Headings: Magnetic fields--Computer programs, Plasma confinement, Equations of motion
Format: Document (PDF)

Title: Computations of normal vortex interaction with blades and circular cylinders.
Creator: Yalamanchili, Ramakrishna., Florida Atlantic University, Marshall, Jeffrey S., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: A numerical model for the simulation of three-dimensional normal blade-vortex interaction has been developed to study the bending and variation of core radius of the vortex due to the influence of the blade and the subsequent unsteady force on the blade. For thin blades, a procedure to enable instantaneous cutting of the vortex has been employed to study the vortex response to cutting. The vortex is represented by a filament model which includes axial flow within the core and non-uniform core...
Show moreA numerical model for the simulation of three-dimensional normal blade-vortex interaction has been developed to study the bending and variation of core radius of the vortex due to the influence of the blade and the subsequent unsteady force on the blade. For thin blades, a procedure to enable instantaneous cutting of the vortex has been employed to study the vortex response to cutting. The vortex is represented by a filament model which includes axial flow within the core and non-uniform core area. The vortex is convected with self-induced velocities given by the Biot-Savart line integral, and the effect of the cylinder is obtained using a vortex sheet panel method. The governing equations for the vortex axial velocity have a form similar to that of the one-dimensional gas dynamics equations and admit "shock-like" discontinuities. The results indicate that the amount of vortex bending due to interaction with the blade is primarily dependent on the ratio of blade thickness T to ambient vortex core radius sigma o, although for a given amount of bending of the vortex axis, increase in cylinder forward speed results in a decrease in vortex core radius. For blades with T/sigma o < 0(1), very little bending is observed for attack angles under the stall limit. In the case of vortex cutting by a blade, vortex shocks and expansion waves are observed to propagate on the vortex axis away from the blade.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14985
Subject Headings: Helicopters, Blades--Noise, Rotors (Helicopters), Vortex-motion
Format: Document (PDF)

Title: Competing mechanisms in the perception of apparent motion: Effects of zero-hertz and time-varying energy.
Creator: Kogan, Kristine Marie, Florida Atlantic University, Hock, Howard S., Charles E. Schmidt College of Science, Department of Psychology
Abstract/Description: Anstis, et al. (1985) have reported that under certain conditions the visual system adapts and the perception of apparent motion breaks down. The present research indicates that breakdown is actually a result of same-place mechanisms successfully competing with motion-detecting mechanisms. Thus, the perception of stationarity (with flicker) can occur at the start of a trial and spontaneously switch to the perception of motion, or vice versa. The response of same-place mechanisms depends on...
Show moreAnstis, et al. (1985) have reported that under certain conditions the visual system adapts and the perception of apparent motion breaks down. The present research indicates that breakdown is actually a result of same-place mechanisms successfully competing with motion-detecting mechanisms. Thus, the perception of stationarity (with flicker) can occur at the start of a trial and spontaneously switch to the perception of motion, or vice versa. The response of same-place mechanisms depends on the zero-hertz energy at each location of an apparent motion stimulus, whereas the response of motion mechanisms depends on the time-varying energy. Average luminance, luminance contrast, the temporal symmetry of the apparent motion display, and relative phase are manipulated to investigate competition between same-place and motion-detecting mechanisms.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15234
Subject Headings: Motion perception (Vision), Perceptual-motor processes, Visual perception
Format: Document (PDF)

FAU Theses and Dissertations (103)	+ -
Honors Student Theses (1)	+ -
Political & Rights Issues & Social Movements Collection (1)	+ -
FAU Undergraduate Student Research (1)	+ -

Vortex-motion (14)	+ -
Motion perception (Vision) (11)	+ -
Criticism and interpretation (10)	+ -
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