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MODE COUPLING IN A BEAM PLASMA
Title
MODE COUPLING IN A BEAM PLASMA.
Creator
FREDERICK, LAWRENCE WILLIAM, Florida Atlantic University
Abstract/Description
The collective coordinate treatment of mode coupling in a beam plasma is investigated by computer simulation. Two methods are derived generalized and programmed. The programming is done for a two mode, one species, stationary plasma. The first method integrates the second order collective Lagrangian equations for the mode amplitudes. This method neglects the plasma temperature and coupling is not observed. The second method integrates the first order Hamiltonian equations for the mode...
Show moreThe collective coordinate treatment of mode coupling in a beam plasma is investigated by computer simulation. Two methods are derived generalized and programmed. The programming is done for a two mode, one species, stationary plasma. The first method integrates the second order collective Lagrangian equations for the mode amplitudes. This method neglects the plasma temperature and coupling is not observed. The second method integrates the first order Hamiltonian equations for the mode amplitudes and their canonical momentum. This takes account of the plasma temperature and coupling is observed. A perturbation theory approach is then suggested which would smooth out the detail of the mode interactions and shorten the calculation time.
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Date Issued
1972
PURL
http://purl.flvc.org/fcla/dt/13485
Subject Headings
Coupled mode theory
Format
Document (PDF)
VALIDATING THE EFFECTIVENESS OF A GOTTMAN METHOD COUPLES THERAPY INTERVENTION, THE TRUST REVIVAL METHOD, FOR AFFAIR RECOVERY: A RANDOMIZED CONTROL TRIAL
Title
VALIDATING THE EFFECTIVENESS OF A GOTTMAN METHOD COUPLES THERAPY INTERVENTION, THE TRUST REVIVAL METHOD, FOR AFFAIR RECOVERY: A RANDOMIZED CONTROL TRIAL.
Creator
Irvine, Taylor J., Peluso, Paul, Florida Atlantic University, Department of Counselor Education, College of Education
Abstract/Description
The present study applies a Gottman Method Couples Therapy (GMCT) intervention, the Trust Revival Method (TRM), to couples' relationships following an affair, using a randomized control waitlist design. Couples (n= 84) were recruited nationally and internationally and subsequently randomized to either an immediate treatment group or a 3-week waitlist group. A 6-month post-trial follow-up was conducted for couples that completed treatment. The revised Specific Affect Coding System (Coan &...
Show moreThe present study applies a Gottman Method Couples Therapy (GMCT) intervention, the Trust Revival Method (TRM), to couples' relationships following an affair, using a randomized control waitlist design. Couples (n= 84) were recruited nationally and internationally and subsequently randomized to either an immediate treatment group or a 3-week waitlist group. A 6-month post-trial follow-up was conducted for couples that completed treatment. The revised Specific Affect Coding System (Coan & Gottman, 2007) was used to code couples' interactions during a 10–15-minute conflict discussion. Significant effects were found when comparing couples' codes against treatment retention and later relationship functioning. Couples also completed various assessments three times during the study, including the 480-question Gottman Connect (GC) assessment tool. Couples on the 3-week waitlist completed one additional pre-treatment assessment before their 3-week wait commenced. Multivariate statistics with appropriate univariate follow-up procedures were employed to determine group differences between the control and experimental groups. Follow-up procedures were also conducted to investigate any differential rates of symptom reduction or treatment success. The researcher used path analysis procedures following Actor Partner Interdependence Model (APIM- Kenny et al., 2020) assumptions to examine the effects of the intervention on overall relationship satisfaction and subsequent affair recovery, revealing significant effects between assessment scores and coded behaviors. Clinical significance testing also showed significant effects in specific relationship domains. The results add to the current research literature, validating GMCT as an effective broad-based couple therapy approach to repair relationships following infidelity. Implications for clinical practice, graduate training, and research are discussed.
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Date Issued
2022
PURL
http://purl.flvc.org/fau/fd/FA00013994
Subject Headings
Couples therapy, Extramarital Relations, Adultery, Couples Therapy--methods
Format
Document (PDF)
MODE-MODE COUPLING IN AN ELECTRON BEAM PLASMA
Title
MODE-MODE COUPLING IN AN ELECTRON BEAM PLASMA.
Creator
ELKMAN, WILLIAM ROBERT., Florida Atlantic University
Abstract/Description
A coherent nonlinear wave-wave coupling effect which is consistent with a more complete description of damping effects of a plane wave disturbance of a finite plasma initially spatially uniform and Maxwellian in velocity space is considered. A smeared out ion background is assumed and the coupling between the ions and electrons is neglected. A self consistent field and collective coordinate approach is used to obtain a dispersion relation for mode coupling in a plasma. The equations for the...
Show moreA coherent nonlinear wave-wave coupling effect which is consistent with a more complete description of damping effects of a plane wave disturbance of a finite plasma initially spatially uniform and Maxwellian in velocity space is considered. A smeared out ion background is assumed and the coupling between the ions and electrons is neglected. A self consistent field and collective coordinate approach is used to obtain a dispersion relation for mode coupling in a plasma. The equations for the amplitudes and the frequencies are solved numerically both by direct time integration and by a perturbation method for two and three modes. The perturbation method solutions are obtained for the n mode equations. The perturbation equations for two modes are solved analytically. For the two mode case the resulting coupling shows that the energy oscillates between the modes and that the periodicity of the amplitudes and the frequencies is associated with the initial parameters. Energy feeding between the modes is also observed for three or more modes. However, phase mixing occurs for more than two modes.
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Date Issued
1973
PURL
http://purl.flvc.org/fcla/dt/13593
Subject Headings
Coupled mode theory, Electron beams
Format
Document (PDF)
MODE-MODE COUPLING OF PLASMA WAVES IN SYSTEMS WITH STRONG NON-LINEARITIES
Title
MODE-MODE COUPLING OF PLASMA WAVES IN SYSTEMS WITH STRONG NON-LINEARITIES.
Creator
LODDEN, JAMES ALAN, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Physics
Abstract/Description
The coupled equations of motion describing electrostatic plasma oscillations are derived using a collective coordinate approach. The boundary between the physical and nonphysical regions of phase space is discussed. The two mode case is studied in detail for both small and large initial disturbances. For small initial disturbances the motion was found to be periodic. For large initial disturbances, non-periodic growing solutions were found that approached one of two asymptotic limits. For...
Show moreThe coupled equations of motion describing electrostatic plasma oscillations are derived using a collective coordinate approach. The boundary between the physical and nonphysical regions of phase space is discussed. The two mode case is studied in detail for both small and large initial disturbances. For small initial disturbances the motion was found to be periodic. For large initial disturbances, non-periodic growing solutions were found that approached one of two asymptotic limits. For these solutions, the variables became infinitely large in a finite time.
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Date Issued
1976
PURL
http://purl.flvc.org/fcla/dt/13828
Subject Headings
Coupled mode theory, Plasma waves
Format
Document (PDF)
Vibrational analysis of a journal bearing
Title
Vibrational analysis of a journal bearing.
Creator
Journeau, Franck Daniel., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description
A Statistical Energy Analysis (SEA) approach is used to investigate the vibrational behavior of a journal bearing. In developing the SEA model, consideration is given to the determination of coupling loss factors between non-conservatively coupled substructures. In the case of the journal bearing, the oil film between the rotating shaft and the bearing liner represents non-conservative coupling. The coupling loss factors are estimated using experimentally measured point mobility functions....
Show moreA Statistical Energy Analysis (SEA) approach is used to investigate the vibrational behavior of a journal bearing. In developing the SEA model, consideration is given to the determination of coupling loss factors between non-conservatively coupled substructures. In the case of the journal bearing, the oil film between the rotating shaft and the bearing liner represents non-conservative coupling. The coupling loss factors are estimated using experimentally measured point mobility functions. The internal loss factors are directly measured with the bearing structure disassembled. Additionally, estimates for the coupling and internal loss factors are obtained in-situ using an energy ratio approach. Using the determined coupling and internal loss factors in an SEA model, estimates for the average mean square velocities on the surface of the bearing subcomponents are obtained for both static and dynamics conditions. The SEA estimates match well with directly measured results for the spatial average surface velocities at medium to high frequencies.
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Date Issued
1992
PURL
http://purl.flvc.org/fcla/dt/14786
Subject Headings
Journal bearings, Machinery--Noise, Couplings, Vibration
Format
Document (PDF)
AN EXPLORATION OF BARRIERS THAT PREVENT USING COUPLE THERAPY TO TREAT SUBSTANCE USE DISORDER
Title
AN EXPLORATION OF BARRIERS THAT PREVENT USING COUPLE THERAPY TO TREAT SUBSTANCE USE DISORDER.
Creator
McNamee, Erin, Spadola, Christine, Florida Atlantic University, School of Social Work, College of Social Work and Criminal Justice
Abstract/Description
Substance Use Disorder (SUD) is a chronic relapsing disease that afflicts 10% of the US population. Recidivism rates for SUD treatment in the United States (US) remain high. Couple therapy has be shown to be an effective treatment modality for SUD, and research consistently indicates that couple therapy is more effective than individual therapy in treating SUD. Still, most US treatment centers do not use couple therapy as a primary treatment modality. To explore the underuse of couple therapy...
Show moreSubstance Use Disorder (SUD) is a chronic relapsing disease that afflicts 10% of the US population. Recidivism rates for SUD treatment in the United States (US) remain high. Couple therapy has be shown to be an effective treatment modality for SUD, and research consistently indicates that couple therapy is more effective than individual therapy in treating SUD. Still, most US treatment centers do not use couple therapy as a primary treatment modality. To explore the underuse of couple therapy and the barriers that prevent its use, individual, semi-structured interviews were conducted with twenty (N = 20) clinical directors of SUD treatment centers across the US. A theoretical thematic analysis was used incorporating Everett Rogers’ diffusion of innovations theory to assess barriers that hinder the use of couple therapy to treat SUD in addiction treatment centers. Issues related to observability, compatibility, and complexity of couple treatment were found to severely impede the implementation of couple therapy in addiction treatment centers. Recommendations include ongoing research to determine influences on agency programming, fostering pro-research environments in universities and agencies, removing barriers to access to evidence-based practice information, and promoting the federal initiative of technology transfer in SUD treatment.
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Date Issued
2020
PURL
http://purl.flvc.org/fau/fd/FA00013548
Subject Headings
Substance Use Disorders, Substance Use Disorders--therapy, Couples Therapy
Format
Document (PDF)
A neuronal G protein-coupled receptor mediates the effect of diet on lifespan and development in Caenorhabditis elegans through autophagy
Title
A neuronal G protein-coupled receptor mediates the effect of diet on lifespan and development in Caenorhabditis elegans through autophagy.
Creator
Parker, Thomas A., Jia, Kailiang, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Animals rely on the integration of a variety of external cues to understand and respond appropriately to their environment. The relative amounts of food and constitutively secreted pheromone detected by the nematode C. elegans determines how it will develop and grow. Starvation conditions cause the animal to enter a protective stage, termed dauer. Dauer animals are non-eating, long-lived and stress resistant. Yet, when these animals are introduced to food replete conditions they will recover...
Show moreAnimals rely on the integration of a variety of external cues to understand and respond appropriately to their environment. The relative amounts of food and constitutively secreted pheromone detected by the nematode C. elegans determines how it will develop and grow. Starvation conditions cause the animal to enter a protective stage, termed dauer. Dauer animals are non-eating, long-lived and stress resistant. Yet, when these animals are introduced to food replete conditions they will recover from dauer and proceed into normal development. Furthermore, food restriction has been demonstrated to extend the lifespan of a wide-range of species including C. elegans. However, the exact mechanism by which food signals are detected and transduced by C. elegans to influence development and longevity remains unknown. Here, we identify a G protein-coupled receptor (GPCR) DCAR-1 that acts in two chemosensory neurons to mediate food signaling in an autophagy-related manner. The DCAR-1 ligand Dihydrocaffeic acid (DHCA) competes with dauer-inducing pheromone to promote growth. DHCA is a key intermediate in the shikimate pathway, which is required to synthesize folate and aromatic amino acids. We report that dcar-1 mutations influence dauer formation and extend wildtype lifespan via a mechanism of dietary restriction. Moreover, we show that the lifespan extension of dcar-1 mutants is completely dependent on autophagy gene atg- 18. Furthermore, our data suggests metabolites derived from shikimate are food signals that control aging and dauer development through GPCR signaling in C. elegans. These studies will contribute to the delineation of mechanisms behind the beneficial effects of dietary restriction in eukaryotic organisms.
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Date Issued
2019
PURL
http://purl.flvc.org/fau/fd/FA00013338
Subject Headings
Caenorhabditis elegans, Autophagy, Receptors, G-Protein-Coupled, Longevity, Diet
Format
Document (PDF)
idee de l'amour dans le couple chez Beauvoir
Title
L' idee de l'amour dans le couple chez Beauvoir.
Creator
Grosjean, Marie-Pierre., Florida Atlantic University, Hokenson, Jan W.
Abstract/Description
One of the constants in Beauvoir's work is her lifelong attention to the phenomenon of love and the idea of the couple. In her philosophy as well as in her fiction, she develops a binary concept of love. On the one hand is "authentic love," connoting respect and reciprocity; on the other is "inauthentic love," a function of conquest and annexation. Because of her adherence to the tenets of Existentialism, Beauvoir, the feminist, skillfully negotiates between the notions of love and freedom.
Date Issued
2004
PURL
http://purl.flvc.org/fcla/dt/13137
Subject Headings
Beauvoir, Simone de,--1908---Criticism and interpretation., Couples in literature., Love in literature.
Format
Document (PDF)
The influence of connectivity on the global dynamics of nonlinear oscillator ensembles
Title
The influence of connectivity on the global dynamics of nonlinear oscillator ensembles.
Creator
Rogers, Jeffrey L., Florida Atlantic University, Wille, Luc T.
Abstract/Description
In this thesis we have studied the global dynamics which spontaneously emerge in ensembles of interacting disparate nonlinear oscillators. Collective phenomena exhibited in these systems include synchronization, quasiperiodicity, chaos, and death. Exact analytical solutions are presented for two and three coupled oscillators with phase and amplitude variations. A phenomenon analogous to a phase-transition is found as a function of interaction-range in a one-dimensional lattice: for coupling...
Show moreIn this thesis we have studied the global dynamics which spontaneously emerge in ensembles of interacting disparate nonlinear oscillators. Collective phenomena exhibited in these systems include synchronization, quasiperiodicity, chaos, and death. Exact analytical solutions are presented for two and three coupled oscillators with phase and amplitude variations. A phenomenon analogous to a phase-transition is found as a function of interaction-range in a one-dimensional lattice: for coupling exponents larger than some critical value, alpha c, synchronization is shown to be impossible. Massively parallel computer simulations in conjunction with finite-size scaling were used to extrapolate to the infinite-size limit.
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Date Issued
1994
PURL
http://purl.flvc.org/fcla/dt/15031
Subject Headings
Nonlinear oscillators, Coupled mode theory, Physics--Data processing, Parallel processing (Electronic computers)
Format
Document (PDF)