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- Title
- Differences in Nurses’ Perceptions of Safety Culture, Nurse-Physician Collaboration, and Level of Job Satisfaction Related to the Type of Obstetrical Physician Service Delivery Model Utilized.
- Creator
- Abiri, Olga, Sherman, Rose O., Florida Atlantic University, Christine E. Lynn College of Nursing
- Abstract/Description
-
Creating a safety culture is the focus in the current healthcare environment. An inhouse, around-the-clock laborist service delivery model has been associated with positive outcomes, but little is known about the laborist structure’s contribution to the labor-anddelivery working environment. The purpose of this descriptive correlational study was to explore the effects of physician service delivery model on safety culture, nurse-physician collaboration, and nurses’ job satisfaction. An...
Show moreCreating a safety culture is the focus in the current healthcare environment. An inhouse, around-the-clock laborist service delivery model has been associated with positive outcomes, but little is known about the laborist structure’s contribution to the labor-anddelivery working environment. The purpose of this descriptive correlational study was to explore the effects of physician service delivery model on safety culture, nurse-physician collaboration, and nurses’ job satisfaction. An additional purpose was to examine associations between nurses’ perceptions of safety culture, nurse-physician collaboration, and job satisfaction. Ray’s (1981, 1989) Theory of Bureaucratic Caring and Homan’s (1974) Social Exchange Theory guided this study. A survey consisting of demographic questions, the Collaborative Practice Scale (Weiss & Davis, 1985), the Hospital Survey on Patient Safety Culture (Agency for Healthcare Research and Quality, 2015; HSOPSC), and the McCloskey and Mueller Satisfaction Scale (McCloskey & Mueller, 1990) was distributed to registered nurses (RNs) nationwide. The results indicated that nurses in facilities using the around-the-clock model had higher perceptions of nursephysician collaboration, but not of safety culture or job satisfaction in relation to the physician service-delivery model. Significant moderate-to-strong correlations between nurses’ perceptions of patient safety and job satisfaction, and a weak correlation between bedside nurses’ perceptions of nurse-physician collaboration and job satisfaction were demonstrated. Additional significant correlations were found between the instrument subscales. Control/responsibility in the MMSS scale was positively associated with both management support for patient safety, supervisors’ and managers’ expectations and actions promoting patient safety, and overall perceptions of safety in the HSOPSC scale. Praise and recognition in the MMSS scale were positively associated with supervisor/manager expectations and actions promoting patient safety in the HSOPSC scale. Further appraisal is needed to understand the mechanism by which the laborist model affects patient care and work environment. Recommendations for future research include replicating the study with a larger sample sizes in specific groups based on the role and scheduled shift, conducting the study in a single system or location to mitigate the effects of other variables; and exploring physicians’ perspectives on the variables being studied.
Show less - Date Issued
- 2017
- PURL
- http://purl.flvc.org/fau/fd/FA00004969, http://purl.flvc.org/fau/fd/FA00004959
- Subject Headings
- Dissertations, Academic -- Florida Atlantic University, Obstetrics--Practice., Medical care--Safety measures., Nurse-physician collaboration., Nurses--Job satisfaction., Labor and delivery.
- Format
- Document (PDF)
- Title
- Temporal and spatial variation in habitat characteristics of tilefish (Lopholatilus chamaeleonticeps) off the east coast of Florida.
- Creator
- Able, Kenneth W., Grimes, Churchill B., Jones, Robert S., Twichell, David C., Harbor Branch Oceanographic Institute
- Date Issued
- 1993
- PURL
- http://purl.flvc.org/FCLA/DT/3172857
- Subject Headings
- Tilefish, Marine sediments --Florida, Carbonates, Sidescan sonar, Oceanographic submersibles
- Format
- Document (PDF)
- Title
- Object-oriented design of flexible manufacturing systems.
- Creator
- Abou-Haidar, Bassam., Florida Atlantic University, Fernandez, Eduardo B.
- Abstract/Description
-
This thesis presents a systematic method for the design and modeling of flexible manufacturing systems, using object-oriented concepts and Petri nets. In the method proposed, we first define the system components in terms of an object model consisting of hierarchical sets of classes and operations. Secondly, we model the dynamic aspects of the system using statecharts, including exceptions. As a third step, we derive Petri nets from those statecharts to realize the concurrency present in the...
Show moreThis thesis presents a systematic method for the design and modeling of flexible manufacturing systems, using object-oriented concepts and Petri nets. In the method proposed, we first define the system components in terms of an object model consisting of hierarchical sets of classes and operations. Secondly, we model the dynamic aspects of the system using statecharts, including exceptions. As a third step, we derive Petri nets from those statecharts to realize the concurrency present in the system. Finally we develop a hierarchy of controllers, corresponding to the layers of the object model, for the independent components of the system based on the Petri nets obtained in the previous step.
Show less - Date Issued
- 1993
- PURL
- http://purl.flvc.org/fcla/dt/14989
- Subject Headings
- Petri nets, Flexible manufacturing systems, Object-oriented programming (Computer science), Real-time control
- Format
- Document (PDF)
- Title
- Bayesian approach to an exponential hazard regression model with a change point.
- Creator
- Abraha, Yonas Kidane, Qian, Lianfen, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Mathematical Sciences
- Abstract/Description
-
This thesis contains two parts. The first part derives the Bayesian estimator of the parameters in a piecewise exponential Cox proportional hazard regression model, with one unknown change point for a right censored survival data. The second part surveys the applications of change point problems to various types of data, such as long-term survival data, longitudinal data and time series data. Furthermore, the proposed method is then used to analyse a real survival data.
- Date Issued
- 2014
- PURL
- http://purl.flvc.org/fau/fd/FA00004013
- Subject Headings
- Bayesian statistical decision theory, Mathematical statistics, Multivariate analysis -- Data processing
- Format
- Document (PDF)
- Title
- American lookback options: Early exercise.
- Creator
- Abramov, Viatcheslav Alexander., Florida Atlantic University, Yuhn, Ky-hyang, College of Business, Department of Economics
- Abstract/Description
-
Lookback options are path dependent contingent claims whose payoff depend on the extrema of a given security's price over a given period. Some of these options are already traded on specialized markets (such as foreign exchange) and mostly in over-the-counter market alongside with other path dependent options (knock-ins, knock-outs, etc.). This thesis examines the existing pricing models of conventional options as well as standard European lookback options and provides some results about...
Show moreLookback options are path dependent contingent claims whose payoff depend on the extrema of a given security's price over a given period. Some of these options are already traded on specialized markets (such as foreign exchange) and mostly in over-the-counter market alongside with other path dependent options (knock-ins, knock-outs, etc.). This thesis examines the existing pricing models of conventional options as well as standard European lookback options and provides some results about early exercise of their American counterparts with the use of notions from the theory of optimal stopping.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/15177
- Subject Headings
- Options (Finance), Derivative securities
- Format
- Document (PDF)
- Title
- Malkes_Malkes: Malkes Malkes.
- Creator
- Abramovitch, Max
- Abstract/Description
-
FAU Libraries Print Music Collection dates from circa 1890-present and includes original manuscripts from renowned, non-living Jewish composers, handwritten music from American and European-born cantors, and rare scores from major American Jewish publishing houses no longer in existence. It also houses one of the nation's largest collections of American Yiddish theater music, comprised of piano-vocal scores spanning the years 1890-1960. This digital collection contains select pieces from the...
Show moreFAU Libraries Print Music Collection dates from circa 1890-present and includes original manuscripts from renowned, non-living Jewish composers, handwritten music from American and European-born cantors, and rare scores from major American Jewish publishing houses no longer in existence. It also houses one of the nation's largest collections of American Yiddish theater music, comprised of piano-vocal scores spanning the years 1890-1960. This digital collection contains select pieces from the FAU Libraries Sheet Music Collection.
Show less - Date Issued
- 1907
- PURL
- http://purl.flvc.org/fau/fd/faupsm000086
- Subject Headings
- Sheet music, Yiddish songs
- Format
- Document (PDF)
- Title
- Malkes-Malkes.
- Creator
- Abramowitz, Max, Russotto, Henry A.
- Date Issued
- 1907
- PURL
- http://purl.flvc.org/fcla/dt/70757
- Subject Headings
- Piano, Voice
- Format
- Document (PDF)
- Title
- A case study of planning and implementing whole-school reform at a middle school.
- Creator
- Abramowitz, Rochelle., Florida Atlantic University, Maslin-Ostrowski, Patricia
- Abstract/Description
-
The purpose of this study was to investigate the dilemmas of planning and implementing whole-school reform in a middle school from the perception of administrators, teachers and parents. A qualitative case study approach was used. Data collection included interviews, observations, and document analysis. Interviews with 28 participants were divided into three consecutive sessions conducted from the bottom up in terms of the hierarchy of power in the organization. Data were transcribed, coded,...
Show moreThe purpose of this study was to investigate the dilemmas of planning and implementing whole-school reform in a middle school from the perception of administrators, teachers and parents. A qualitative case study approach was used. Data collection included interviews, observations, and document analysis. Interviews with 28 participants were divided into three consecutive sessions conducted from the bottom up in terms of the hierarchy of power in the organization. Data were transcribed, coded, triangulated, and analyzed to understand the views of participants. The study resulted in three major findings: (a) The principal enhanced the learning organization's capacity for whole-school reform by balancing tensions and conflicts; (b) Implementing a high-stakes testing regime and reform design simultaneously contributed to teacher overload, and reduced the capacity of teachers to implement whole-school reform; and, (c) Learning communities had a pivotal role in fostering collaboration for whole-school reform. The study concluded that: (a) Principal leadership is vital to successful whole-school reform implementation; (b) The crucial challenge of principals in whole-school reform is forging a network of strong relationships within and across staff work teams and the community through the development of learning communities and professional development; and, (c) Whole-school reform must be balanced with and adapted to accountability system if it is to have a chance of succeeding.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/12080
- Subject Headings
- Middle school education, Educational change, Educational leadership, School management and organization
- Format
- Document (PDF)
- Title
- Out with the “I” and In with the “Kin”: Environmental Activism Through Speculative Fiction.
- Creator
- Abreu Toribio, Mailyn, MacDonald, Ian P., Florida Atlantic University, Dorothy F. Schmidt College of Arts and Letters, Department of English
- Abstract/Description
-
Non-Anglophone voices in literature can lead to a better understanding of the intricate relationships shown by Ashley Dawson tying capitalism, slow violence, and uneven development to climate change. There is skepticism that science fiction (sf) in particular can properly present climate issues in the anthropocentric era that we live in today, but scholars such as Shelley Streeby argue against such perceptions. Science fiction writers that use magical realism, such as Ngugi wa Thiong’o and...
Show moreNon-Anglophone voices in literature can lead to a better understanding of the intricate relationships shown by Ashley Dawson tying capitalism, slow violence, and uneven development to climate change. There is skepticism that science fiction (sf) in particular can properly present climate issues in the anthropocentric era that we live in today, but scholars such as Shelley Streeby argue against such perceptions. Science fiction writers that use magical realism, such as Ngugi wa Thiong’o and Nalo Hopkinson, as ecological sf have already accomplished the task of creating speculative works that fit in perfectly under the umbrella of “serious fictions.” These writers work from a non-Anglophone perspective or from a minority group within a Western society, allowing for different modes of thinking to play a part in these bigger discourses. Writers, educators, and other scholars need to reestablish humanity’s kinship with nature.
Show less - Date Issued
- 2019
- PURL
- http://purl.flvc.org/fau/fd/FA00013178
- Subject Headings
- Speculative fiction, Dawson, Ashley, 1965-, Activists, Anthropogenic effects on nature
- Format
- Document (PDF)
- Title
- Some graph connectivity conditions and their implications.
- Creator
- Abreu, Marien, Florida Atlantic University, Locke, Stephen C.
- Abstract/Description
-
This dissertation studies two independent problems, each related to a special connectivity condition in a simple graph. The first is a distance-degree condition called cohesion. Given a tree T with n vertices, we analyze the minimum integer f(T) = k, in terms of n, for which any connected k-cohesive graph G contains a copy of T, such that G-V(T) is connected. The problem comes from a generalization of an exercise by Lovasz [L7] in which it is shown that f(K2) = 5. Locke, Tracy and Voss [L5]...
Show moreThis dissertation studies two independent problems, each related to a special connectivity condition in a simple graph. The first is a distance-degree condition called cohesion. Given a tree T with n vertices, we analyze the minimum integer f(T) = k, in terms of n, for which any connected k-cohesive graph G contains a copy of T, such that G-V(T) is connected. The problem comes from a generalization of an exercise by Lovasz [L7] in which it is shown that f(K2) = 5. Locke, Tracy and Voss [L5] have proved that in general f(T) > 2n, and in the case in which T is a path, equality is attained. Also Locke [L5.1] proved that f(T) < 4n. Here we improve the upper bound to 4n-6 when T is not a path and to 2n + 2 when T has diameter at most 4. In the particular case of K1,3 we show that f(K1,3) = 2n = 8 is attained. The conjecture that remains open is whether f(T) = 2n for any tree T on n vertices. The second problem studied here is a particular case of the well known relation between the path-connectivity and a set of long cycles, which generate the cycle space of a simple graph. The main conjecture in this topic is by Bondy [B1], and states that if G is a 3-connected graph, with minimum degree at least d and with at least 2d vertices, then every cycle of G can be written as the symmetric difference of an odd number of cycles, each of whose lengths are at least 2d-1. Hartman [H2], Locke [L1, L2, L3], Barovich [BL] and Teng [L6] have proved results related to this conjecture. Here we show that 2-connected, 6-path-connected graphs with at least 9 vertices and minimum degree at least 3 are 6-generated. And more generally, we prove that if a graph G is 2-connected, k-path-connected, and contains a long cycle, then G is (k + 1)-generated, up to some cases which are characterized. The conjecture [L3] of whether, for some constant m, 1/2 < m < 1, every k-path-connected graph is mk-generated, remains open.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fcla/dt/12030
- Subject Headings
- Trees (Graph theory), Paths and cycles (Graph theory)
- Format
- Document (PDF)
- Title
- Remote labs: Active element IV characteristics.
- Creator
- Abu-El Humos, Ali M., Florida Atlantic University, Alhalabi, Bassem A.
- Abstract/Description
-
This thesis proposes the use of remote laboratory experiments in distance education. Remote labs combine both the convenience of distance education and the effectiveness of the traditional physical campus labs. Moreover, this research studies the different hardware and software technologies that would make remote lab experimentation feasible in terms of cost and quality. The focus in this thesis is how to use BS2 with Microsoft ASP and COM technologies to build a remote lab experiment with...
Show moreThis thesis proposes the use of remote laboratory experiments in distance education. Remote labs combine both the convenience of distance education and the effectiveness of the traditional physical campus labs. Moreover, this research studies the different hardware and software technologies that would make remote lab experimentation feasible in terms of cost and quality. The focus in this thesis is how to use BS2 with Microsoft ASP and COM technologies to build a remote lab experiment with minimum hardware and software cost, while maintaining satisfactory on-line experiment quality. Remote labs is a creative innovation in the world of distance education. This thesis is based on the pioneering work of Dr. Alhalabi and Dr. Hamza.
Show less - Date Issued
- 2002
- PURL
- http://purl.flvc.org/fcla/dt/12939
- Subject Headings
- Distance education, Internet in higher education, Scientific apparatus and instruments--Computer simulation
- Format
- Document (PDF)
- Title
- Low latency and energy efficient MAC protocols for wireless sensor networks.
- Creator
- Abu-El Humos, Ali M., Florida Atlantic University, Alhalabi, Bassem A., Cardei, Mihaela, College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
Energy consumption is a critical design issue in Wireless Sensor Networks (WSNs), since sensor nodes are battery operated, and replacing or recharging the battery is usually infeasible. Energy efficient solutions are sought at all network levels, especially at the medium access level. The IEEE 802.11 MAC protocol is optimized for Ad hoc Wireless Networks, but cannot be adopted for WSNs because it has the idle listening problem, which is a major source of energy waste. Several Medium Access...
Show moreEnergy consumption is a critical design issue in Wireless Sensor Networks (WSNs), since sensor nodes are battery operated, and replacing or recharging the battery is usually infeasible. Energy efficient solutions are sought at all network levels, especially at the medium access level. The IEEE 802.11 MAC protocol is optimized for Ad hoc Wireless Networks, but cannot be adopted for WSNs because it has the idle listening problem, which is a major source of energy waste. Several Medium Access Control (MAC) protocols have been proposed for WSNs to save the transceiver energy by introducing periodic listen/sleep cycles, and thus overcome the idle listing problem. The periodic listen sleep cycles, however, will increase the network latency and require extra overhead to establish and maintain synchronization among nodes in the network. This dissertation introduces a new MAC protocol for WSNs based on the SMAC protocol to improve its latency performance without compromising its energy consumption. The original SMAC provides an efficient solution for the energy consumption problem due to idle listening, but it increases latency especially in low duty cycle applications. TMAC was proposed to further reduce the energy consumption in SMAC and introduced the Forward Request-To-Send (FRTS) packet to solve the early sleep problem observed in TMAC. Later, Adaptive SMAC was proposed to reduce the latency problem in SMAC by at least 50% at light traffic load. Our new protocol, FASMAC, combines the advantages of both adaptive listening and the usage of FRTS packet in TMAC to further reduce the latency of SMAC. In FASMAC, a packet can travel at least three hops away from its source node within one time cycle. This results in at least 67% reduction in latency at light traffic when compared with the original SMAC. We also propose an energy model for performance evaluation of WSNs protocols using the network simulator NS2. The current energy model of NS2 was designed to handle Ad hoc Wireless Networks where the low power consumption sleep mode was not an issue. However, this is not the case in WSNs. We show that NS2 energy model is not suitable to evaluate the performance of WSNs protocols because it does not account for the low power sleep mode. This dissertation proposes a solution to this deficiency and provides simulation results that match real experimental results performed on the actual sensor motes.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/12149
- Subject Headings
- Wireless communication systems, Sensor networks, Power resources--Efficiency
- Format
- Document (PDF)
- Title
- Selected TLR Agonists Act in Synergy to Reprogram DC-NK Cross-talk and Generate Effector T cells in Nicotinic Environment.
- Creator
- Abu-Nuwar, Emily, Tamjidi, Saba, Nouri-Shirazi, Mahyar, Office of Undergraduate Research and Inquiry
- Abstract/Description
-
The magnitude of immune responses to vaccination is a critical factor in determining protection from diseases. We reported that nicotine disrupts the properties of DCs that are pivotal in the initiation of immune response to vaccines. Here we investigated whether TLR agonist(s) could overcome the effects of nicotine on human DC and DC-NK cross-talk essential for effector T cell generation. nicDC, nicDC-NK, and nicDC-NK-T cultures exposed to TLR agonists were evaluated for expression of...
Show moreThe magnitude of immune responses to vaccination is a critical factor in determining protection from diseases. We reported that nicotine disrupts the properties of DCs that are pivotal in the initiation of immune response to vaccines. Here we investigated whether TLR agonist(s) could overcome the effects of nicotine on human DC and DC-NK cross-talk essential for effector T cell generation. nicDC, nicDC-NK, and nicDC-NK-T cultures exposed to TLR agonists were evaluated for expression of costimulatory molecules, cytokines, and intracellular cytokine IFN-g using ELISA and flow cytometry. Our data shows that among the TLR agonists, TLR3 and TLR8/7 synergistically optimized nicDC maturation co-cultured NK cell activation. Importantly, similar to DC-NK, nicDC-NK treated with TLR3 and TLR8/7 and co-cultured with naïve T cells promoted a comparable number of effector T cells. Our data suggest that the addition of appropriate TLR agonist(s) to vaccine formulation could potentially improve the smokers’ immune response to vaccination.
Show less - Date Issued
- 2016
- PURL
- http://purl.flvc.org/fau/fd/FA00005554
- Subject Headings
- College students --Research --United States.
- Format
- Document (PDF)
- Title
- Studies on nonlinear activity and cross-entropy considerations in neural networks.
- Creator
- Abusalah, Salahalddin Tawfiq., Florida Atlantic University, Neelakanta, Perambur S., College of Engineering and Computer Science, Department of Computer and Electrical Engineering and Computer Science
- Abstract/Description
-
The objectives of this research as deliberated in this dissertation are two-folded: (i) To study the nonlinear activity in the neural complex (real and artificial) and (ii) to analyze the learning processe(s) pertinent to an artificial neural network in the information-theoretic plane using cross-entropy error-metrics. The research efforts envisaged enclave the following specific tasks: (i) Obtaining a general solution for the Bernoulli-Riccati equation to represent a single parameter family...
Show moreThe objectives of this research as deliberated in this dissertation are two-folded: (i) To study the nonlinear activity in the neural complex (real and artificial) and (ii) to analyze the learning processe(s) pertinent to an artificial neural network in the information-theoretic plane using cross-entropy error-metrics. The research efforts envisaged enclave the following specific tasks: (i) Obtaining a general solution for the Bernoulli-Riccati equation to represent a single parameter family of S-shaped (sigmoidal) curves depicting the nonlinear activity in the neural network. (ii) Analysis of the logistic growth of output versus input values in the neural complex (real and artificial) under the consideration that the boundaries of the sets constituting the input and output entities are crisp and/or fuzzy. (iii) Construction of a set of cross-entropy error-metrics (known as Csiszar's measures) deduced in terms of the parameters pertinent to a perceptron topology and elucidation of their relative effectiveness in training the network optimally towards convergence. (iv) Presenting the methods of symmetrizing and balancing the aforesaid error-entropy measures (in the information-theoretic plane) so as to make them usable as error-metrics in the test domain. (v) Description and analysis of the dynamics of neural learning process in the information-theoretic plane for both crisp and fuzzy attributes of input values. Relevant to these topics portraying the studies on nonlinear activity and cross-entropy considerations vis-a-vis neural networks, newer and/or exploratory inferences are made, logical conclusions are enumerated and relative discussions are presented along with the scope for future research to be pursued.
Show less - Date Issued
- 1996
- PURL
- http://purl.flvc.org/fcla/dt/12447
- Subject Headings
- Neural networks (Computer science), Entropy (Information theory), Nonlinear control theory
- Format
- Document (PDF)
- Title
- Resource-sensitive intrusion detection models for network traffic.
- Creator
- Abushadi, Mohamed E., Florida Atlantic University, Khoshgoftaar, Taghi M.
- Abstract/Description
-
Network security is an important subject in today's extensively interconnected computer world. The industry, academic institutions, small and large businesses and even residences are now greatly at risk from the increasing onslaught of computer attacks. Such malicious efforts cause damage ranging from mere violation of confidentiality and issues of privacy up to actual financial loss if business operations are compromised, or even further, loss of human lives in the case of mission-critical...
Show moreNetwork security is an important subject in today's extensively interconnected computer world. The industry, academic institutions, small and large businesses and even residences are now greatly at risk from the increasing onslaught of computer attacks. Such malicious efforts cause damage ranging from mere violation of confidentiality and issues of privacy up to actual financial loss if business operations are compromised, or even further, loss of human lives in the case of mission-critical networked computer applications. Intrusion Detection Systems (IDS) have been used along with the help of data mining modeling efforts to detect intruders, yet with the limitation of organizational resources it is unreasonable to inspect every network alarm raised by the IDS. Modified Expected Cost of Misclassification ( MECM) is a model selection measure that is resource-aware and cost-sensitive at the same time, and has proven to be effective for the identification of the best resource-based intrusion detection model.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fcla/dt/13054
- Subject Headings
- Computer networks--Security measures--Automation, Computers--Access control, Data mining, Computer security
- Format
- Document (PDF)
- Title
- Trim analysis by shooting and finite elements and Floquet eigenanalysis by QR and subspace iterations in helicopter dynamics.
- Creator
- Achar, Nagari Shriranga., Florida Atlantic University, Gaonkar, Gopal H., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
The trim analysis for the initial state and control inputs that satisfy response periodicity and flight conditions, and the Floquet eigenanalysis for a few largest eigenvalues of the Floquet transition matrix (FTM) are investigated. In the trim analysis, the convergence of Newton iteration is investigated in computing the periodic initial state and control inputs sequentially and in parallel. The trim analysis uses the shooting method and two h-versions of temporal finite element methods, one...
Show moreThe trim analysis for the initial state and control inputs that satisfy response periodicity and flight conditions, and the Floquet eigenanalysis for a few largest eigenvalues of the Floquet transition matrix (FTM) are investigated. In the trim analysis, the convergence of Newton iteration is investigated in computing the periodic initial state and control inputs sequentially and in parallel. The trim analysis uses the shooting method and two h-versions of temporal finite element methods, one based on displacement formulation and the other on mixed formulation of displacements and momenta. In each method, both the sequential and in-parallel schemes are used, and the resulting nonlinear equations are solved by damped Newton iteration with an optimally selected damping parameter. The reliability of damped Newton iteration, including earlier-observed divergence problems, is quantified by the maximum condition number of the Jacobian matrices of the iterative scheme. For illustrative purposes, rigid flap-lag and flap-lag-torsion models based on quasisteady aerodynamics are selected. Demanding trim analysis conditions are included by considering advance ratios or dimensionless flight speeds twice as high as those of current helicopters. Concerning the Floquet eigenanalysis, the feasibility of using the Arnoldi-Saad method, one of the emerging subspace iteration methods, is explored as an alternative to the currently used QR method, which is not economical for partial eigenanalysis. The reliability of the Arnoldi-Saad method is quantified by the eigenvalue condition numbers and the residual errors of the eigenpairs. In the three trim analysis methods, while the optimally selected damping parameter provides almost global convergence, the in-parallel scheme requires much less machine time than the conventional sequential scheme; both schemes have comparable reliability of the Newton iteration without and with damping. The Arnoldi-Saad method takes much less machine time than the QR method with comparable reliability.
Show less - Date Issued
- 1992
- PURL
- http://purl.flvc.org/fcla/dt/12297
- Subject Headings
- Helicopters--Dynamics, Helicopters--Handling characteristics, Stability of helicopters--Mathematical models
- Format
- Document (PDF)
- Title
- On the spectrum of positive operators.
- Creator
- Acharya, Cheban P., Charles E. Schmidt College of Science, Department of Mathematical Sciences
- Abstract/Description
-
Spectral theory, mathematical system theory, evolution equations, differential and difference equations [electronic resource] : 21st International Workshop on Operator Theory and Applications, Berlin, July 2010.It is known that lattice homomorphisms and G-solvable positive operators on Banach lattices have cyclic peripheral spectrum (See [17]). In my thesis I prove that positive contractions whose spectral radius is 1 on Banach lattices with increasing norm have cyclic peripheral point...
Show moreSpectral theory, mathematical system theory, evolution equations, differential and difference equations [electronic resource] : 21st International Workshop on Operator Theory and Applications, Berlin, July 2010.It is known that lattice homomorphisms and G-solvable positive operators on Banach lattices have cyclic peripheral spectrum (See [17]). In my thesis I prove that positive contractions whose spectral radius is 1 on Banach lattices with increasing norm have cyclic peripheral point spectrum. I also prove that if the Banach lattice is a K B space satisfying the growth conditon and º is an eigenvalue of a positive contraction T such that [º] = 1, then 1 is also an eigenvalue of T as well as an eigenvalue of T¨, the dual of T. I also investigate the conditions on contraction operators on Hilbert lattices and AL-spaces which guanantee that 1 is an eigenvalue. As we know from [17], if T : E-E is a positive ideal irreducible operator on E such the r (T) = 1 is a pole of the resolvent R(º, T), then r (T) is simple pole with dimN (T -r(T)I) and ºper(T) is cyclic. Also all points of ºper(T) are simple poles of the resolvent R(º,T). SInce band irreducibility and º-order continuity do not imply ideal irreducibility [2], we prove the analogous results for band irreducible, º-order continuous operators.
Show less - Date Issued
- 2012
- PURL
- http://purl.flvc.org/FAU/3359288
- Subject Headings
- Operator theory, Evolution equations, Banach spaces, Linear topological spaces, Functional analysis
- Format
- Document (PDF)
- Title
- Fluctuation and correlation effects in a charged surface immersed in an asymmetric electrolyte solution.
- Creator
- Acharya, Pramod, Lau, Andy W. C., Graduate College
- Date Issued
- 2013-04-12
- PURL
- http://purl.flvc.org/fcla/dt/3361263
- Subject Headings
- Green's functions, Field theory (Physics), Electrostatics
- Format
- Document (PDF)
- Title
- Charge Regulation of a Surface Immersed in an Electrolyte Solution.
- Creator
- Acharya, Pramod, Lau, Andy W. C., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Physics
- Abstract/Description
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In this thesis, we investigate theoretically a new model of charge regulation of a single charged planar surface immersed in an aqueous electrolyte solution. Assuming that the adsorbed ions are mobile in the charged plane, we formulate a field theory of charge regulation where the numbers of adsorbed ions can be determined consistently by equating the chemical potentials of the adsorbed ions to that of the ions in the bulk. We analyze the mean-field treatment of the model for electrolyte of...
Show moreIn this thesis, we investigate theoretically a new model of charge regulation of a single charged planar surface immersed in an aqueous electrolyte solution. Assuming that the adsorbed ions are mobile in the charged plane, we formulate a field theory of charge regulation where the numbers of adsorbed ions can be determined consistently by equating the chemical potentials of the adsorbed ions to that of the ions in the bulk. We analyze the mean-field treatment of the model for electrolyte of arbitrary valences, and then beyond, where correlation effects are systematically taken into account in a loop expansion. In particular, we compute exactly various one-loop quantities, including electrostatic potentials, ion distributions, and chemical potentials, not only for symmetric (1, 1) electrolyte but also for asymmetric (2, 1) electrolyte, and make use of these quantities to address charge regulation at the one-loop level. We find that correlation effects give rise to various phase transitions in the adsorption of ions, and present phase diagrams for (1, 1) and (2, 1) electrolytes, whose distinct behaviors suggest that charge regulation, at the one-loop level, is no longer universal but depends crucially on the valency of the ions.
Show less - Date Issued
- 2016
- PURL
- http://purl.flvc.org/fau/fd/FA00004560, http://purl.flvc.org/fau/fd/FA00004560
- Subject Headings
- Surface chemistry., Intermolecular forces., Electrodynamics., Quantum field theory.
- Format
- Document (PDF)
- Title
- Critical Sexual Theory and Postcolonial Studies: Assessing Disability Policies and Narratives of Women with Disabilities in Nepal.
- Creator
- Acharya, Tulasi, Sementelli, Arthur, Florida Atlantic University, College for Design and Social Inquiry, School of Public Administration
- Abstract/Description
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This dissertation explored the lives of women with disabilities who have to suffer more than men with disabilities despite prevailing disability policies in Nepal that emphasize nondiscrimination against people with disabilities. The study explored the idea that there are policy gaps between disability policies and the narratives of women with disabilities. This dissertation used critical sexual theory and postcolonialism as critical frameworks and narrative analysis as a method to analyze...
Show moreThis dissertation explored the lives of women with disabilities who have to suffer more than men with disabilities despite prevailing disability policies in Nepal that emphasize nondiscrimination against people with disabilities. The study explored the idea that there are policy gaps between disability policies and the narratives of women with disabilities. This dissertation used critical sexual theory and postcolonialism as critical frameworks and narrative analysis as a method to analyze the disability policies and narratives of women with disabilities to explore policy gaps and the need for supportive gender policies. The researcher analyzed the literary works of five female Nepali authors with disabilities: Radhika Dahal, Jhamak Ghimire, Sabitri Karki, Parijaat, and Mira Sahi, in Nepal. With the support of NVivo qualitative research software, and the use of the frameworks and methodology, the researcher discovered the policy gaps and underscored the need for supportive gender policies to address the emotional and psychological needs of women with disabilities.
Show less - Date Issued
- 2019
- PURL
- http://purl.flvc.org/fau/fd/FA00013179
- Subject Headings
- Nepal, Women with disabilities, Disabilities--Government policy, Narratives
- Format
- Document (PDF)