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Title: Remote laboratories for distance education.
Creator: Anandapuram, Sudeep Hari., Florida Atlantic University, Alhalabi, Bassem A.
Abstract/Description: In the past few years many US institutions of higher education have established virtual classrooms where learners pursue higher education via the Internet. The true challenge in Distance Education however remains; how do students perform real lab experiments--such as electronics over the Internet? To examine this challenge, a survey was conducted on over fifty Web-based educational environments, to assess the shortcomings of laboratory facilities currently available on the Internet. The...
Show moreIn the past few years many US institutions of higher education have established virtual classrooms where learners pursue higher education via the Internet. The true challenge in Distance Education however remains; how do students perform real lab experiments--such as electronics over the Internet? To examine this challenge, a survey was conducted on over fifty Web-based educational environments, to assess the shortcomings of laboratory facilities currently available on the Internet. The survey revealed that contemporary labs touted to be virtual environments are merely software simulations. Hence the new idea of a facility that will realistically provide lab experiments over the Internet. With this aim, an innovative system is designed using object-oriented methodologies in Unified Modeling Language to include all aspects of software and hardware. Java/RMI is used as the system's development tool. An experiment to measure the "VI characteristics of a Resistor" is built using National Instruments' DAQ systems. The students can logon through the Internet, register, and perform experiments by sending various current values, and measure the corresponding voltages across a resistor. The results are submitted for grade and the teaching assistant can grade the student after observing the input and output values over the Internet.
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Date Issued: 1999
PURL: http://purl.flvc.org/fcla/dt/15636
Subject Headings: Distance education, Virtual reality
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.
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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: A STUDY OF FRICTION DAMPING AS APPLIED TO VIBRATING STRUCTURES.
Creator: DESAI, VIJAY R., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description: Of the many methods of introducing damping in vibrating structures, the dissipation of energy due to interfacial slip can significantly increase the damping loss factor. However, because of the lack of understanding and other phenomena such as fretting corrosion and loss of structural rigidity, friction damping is rarely used. A study was thus undertaken to investigate this complex phenomenon, with emphasis on trying to gain a better understanding of friction damping with certain parameters...
Show moreOf the many methods of introducing damping in vibrating structures, the dissipation of energy due to interfacial slip can significantly increase the damping loss factor. However, because of the lack of understanding and other phenomena such as fretting corrosion and loss of structural rigidity, friction damping is rarely used. A study was thus undertaken to investigate this complex phenomenon, with emphasis on trying to gain a better understanding of friction damping with certain parameters such as clamping pressure, frequency, magnitude of excitation and surface finish. Although the non-linearities associated with friction makes this mechanism difficult to model mathematically, finite element (FE) analysis shows some promise. Although the results obtained using an FE model were not exactly comparable to the experimental results, these analytical results did show the same general trends as observed in the experiments.
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Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14369
Subject Headings: Damping (Mechanics), Vibration
Format: Document (PDF)

Title: A STUDY OF STRESS CORROSION CRACKING IN 7079-T651 ALUMINUM.
Creator: FINNEGAN, JOHN EDMUND., Florida Atlantic University, Hartt, William H.
Abstract/Description: This study investigated the stress corrosion cracking behavior of aluminum alloy 7079 - T651 in two corrosive environments, sea water and a 3% NaCl-distilled water solution. Self stressing, double cantilever beam specimens were employed; and these were stressed at various levels, exposed in one of the two test environments and crack extension monitored as a function of time. Equations for the plane strain stress intensity factor (K1) were compared and evaluated, with respect to stress...
Show moreThis study investigated the stress corrosion cracking behavior of aluminum alloy 7079 - T651 in two corrosive environments, sea water and a 3% NaCl-distilled water solution. Self stressing, double cantilever beam specimens were employed; and these were stressed at various levels, exposed in one of the two test environments and crack extension monitored as a function of time. Equations for the plane strain stress intensity factor (K1) were compared and evaluated, with respect to stress intensities calculated from compliance measurements. Results suggest that stress intensity is not the only important variable controlling crack growth rate and a time dependent cracking mechanism may govern a portion of crack growth.
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Date Issued: 1975
PURL: http://purl.flvc.org/fcla/dt/13730
Subject Headings: Aluminum--Corrosion, Stress corrosion
Format: Document (PDF)

Title: Sediment classification of the sea floor using the Chirp Sonar and the Biot model.
Creator: Beaujean, Pierre-Philippe, Florida Atlantic University, LeBlanc, Lester R.
Abstract/Description: A new method is proposed to infer the geotechnical properties of the sea floor from its response to the frequency-modulated pulses emitted by the subbottom profiler called Chirp Sonar. The environment is assumed to be a multilayered medium, composed of homogeneous layers, or an inhomogeneous half-space with depth-dependent properties. The acoustic response of the sediment is computed using the Biot-Stoll theory. The Levenberg-Marquardt method is applied to fit the synthetic response to the...
Show moreA new method is proposed to infer the geotechnical properties of the sea floor from its response to the frequency-modulated pulses emitted by the subbottom profiler called Chirp Sonar. The environment is assumed to be a multilayered medium, composed of homogeneous layers, or an inhomogeneous half-space with depth-dependent properties. The acoustic response of the sediment is computed using the Biot-Stoll theory. The Levenberg-Marquardt method is applied to fit the synthetic response to the experimental response of an homogeneous layer overlying the sea floor. The porosity, the permeability, the mean grain diameter, the mass density, the bulk modulus and the shear modulus within this sediment layer can be estimated. A multilayered medium with depth-dependent properties could be applied to this inversion technique in the future.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15208
Subject Headings: Marine sediments--Acoustic properties, Underwater acoustics--Measurement, Ocean bottom, Sonar
Format: Document (PDF)

Title: Sediment layer tracking using neural networks.
Creator: Freyermuth, Vincent Nicolas., Florida Atlantic University, Schock, Steven G.
Abstract/Description: The detection of sediment layer interfaces in normal incidence acoustic reflection data is a requirement for automatic classification and geologic mapping of subsurface layers. The detection is difficult because of the constructive and destructive interference caused by the impedance changes in the sediment column and high scattering noise levels. The purpose of this work is to implement a procedure using neural networks that automatically detects the sediment layers from the envelope of...
Show moreThe detection of sediment layer interfaces in normal incidence acoustic reflection data is a requirement for automatic classification and geologic mapping of subsurface layers. The detection is difficult because of the constructive and destructive interference caused by the impedance changes in the sediment column and high scattering noise levels. The purpose of this work is to implement a procedure using neural networks that automatically detects the sediment layers from the envelope of acoustic reflections. The data was collected using a sub-bottom profiler that transmits a 2 to 10 kHz FM pulse. The detection procedure is a three step method: a first neural network removes most of the reflections due to random scatterers, a second neural network tracks the layers and a third algorithm recognizes the segments of detected layers corresponding to the same sediment interface Applied on different sub-bottom images, the procedure detects more than 80% of the layers correctly.
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Date Issued: 1998
PURL: http://purl.flvc.org/fcla/dt/15561
Subject Headings: Neural networks (Computer science), Marine sediments--Acoustic properties
Format: Document (PDF)

Title: RESPONSE OF 1018 STEEL TO CONCURRENT CYCLIC LOADING AND CATHODIC POLARIZATION IN NATURAL SEA WATER.
Creator: HOOPER, WILLIAM CLARENCE., Florida Atlantic University, Hartt, William H.
Abstract/Description: Reverse bend, constant deflection fatigue experiments were conducted in natural sea water at 1850 cycles per minute (cpm) to investigate the response of 1018 notched steel to concurrent cyclic loading and cathodic polarization. For comparison purposes S-log N curves were also determined in air and high purity argon. These indicate that the endurance limit established in sea water by cathodic polarization at -0.85 volts, Saturated Calomel Electrode (SCE), is greater than in either air or argon...
Show moreReverse bend, constant deflection fatigue experiments were conducted in natural sea water at 1850 cycles per minute (cpm) to investigate the response of 1018 notched steel to concurrent cyclic loading and cathodic polarization. For comparison purposes S-log N curves were also determined in air and high purity argon. These indicate that the endurance limit established in sea water by cathodic polarization at -0.85 volts, Saturated Calomel Electrode (SCE), is greater than in either air or argon. Two mechanisms are considered as responsible for this behavior. 1. Presence of carbonate and hydroxide deposits coupled with increased alkalinity at non-propagating crack tips. 2. Adsorbed OH- layer at non-propagating crack tips.
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Date Issued: 1976
PURL: http://purl.flvc.org/fcla/dt/13781
Subject Headings: Steel--Testing
Format: Document (PDF)

Title: STUDY OF BANDWIDTH ALLOCATION STRATEGIES FOR NETWORKS INTEGRATING VOICE AND DATA.
Creator: IZQUIERDO, MICHAEL ROBERT., Florida Atlantic University, Ilyas, Mohammad
Abstract/Description: The purpose of this thesis is to study three types of bandwidth allocation strategies for a network integrating voice and data, commonly referred to as Integrated Services Digital Network or ISDN, using GPSS V simulati ons. The strategies are Non-Boundary, Movable-Boundary, and Non- and Movable- Boundary with Digital Speech Interpolation. The theoretical behavior of each strategy is discussed. Exact solutions for small systems with one or two slots is shown along with approximations for...
Show moreThe purpose of this thesis is to study three types of bandwidth allocation strategies for a network integrating voice and data, commonly referred to as Integrated Services Digital Network or ISDN, using GPSS V simulati ons. The strategies are Non-Boundary, Movable-Boundary, and Non- and Movable- Boundary with Digital Speech Interpolation. The theoretical behavior of each strategy is discussed. Exact solutions for small systems with one or two slots is shown along with approximations for larger systems. General descriptions of the GPSS models for each strategy is provided. The GPSS model source code for each strategy is presented in the Appendix. Simulation is used to explore the effects of the service time ratio a of voice and data on system performance. Also, the performance of Time Division Multiplex or TDM systems with 24 channels, commonly referred to as Tl, is shown.
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Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14355
Subject Headings: Integrated services digital networks, Time management
Format: Document (PDF)

Title: Reputation-based system for encouraging cooperation of nodes in mobile ad hoc networks.
Creator: Anantvalee, Tiranuch., Florida Atlantic University, Wu, Jie
Abstract/Description: In a mobile ad hoc network, node cooperation in packet forwarding is required for the network to function properly. However, since nodes in this network usually have limited resources, some selfish nodes might intend not to forward packets to save resources for their own use. To discourage such behavior, we propose RMS, a reputation-based system, to detect selfish nodes and respond to them by showing that being cooperative will benefit there more than being selfish. We also detect, to some...
Show moreIn a mobile ad hoc network, node cooperation in packet forwarding is required for the network to function properly. However, since nodes in this network usually have limited resources, some selfish nodes might intend not to forward packets to save resources for their own use. To discourage such behavior, we propose RMS, a reputation-based system, to detect selfish nodes and respond to them by showing that being cooperative will benefit there more than being selfish. We also detect, to some degree, nodes who forward only the necessary amount of packets to avoid being detected as selfish. We introduce the use of a state model to decide what we should do or respond to nodes in each state. In addition, we introduce the use of a timing period to control when the reputation should be updated and to use as a timeout for each state. The simulation results show that RMS can identify selfish nodes and punish them accordingly, which provide selfish nodes with an incentive to behave more cooperatively.
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Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13406
Subject Headings: Computer networks--Security measures, Wireless communication systems, Routers (Computer networks), Computer network architectures
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.
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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: Response of a cascade of blades to an incoming turbulent flow.
Creator: Bocquillion, Olivier Christophe., Florida Atlantic University, Glegg, Stewart A. L.
Abstract/Description: The purpose of this research is to study the modification of a turbulent flow as it passes through a cascade of flat plates. The results will then be compared with experimental results obtained in a companion experimental study being conducted at Virginia Tech. In a typical marine propulsor turbulent flow passes through a set of inlet guide vanes (IGVs) and then interacts with the propeller blades: this process creates unwanted vibration and sound. The purpose of this research is to determine...
Show moreThe purpose of this research is to study the modification of a turbulent flow as it passes through a cascade of flat plates. The results will then be compared with experimental results obtained in a companion experimental study being conducted at Virginia Tech. In a typical marine propulsor turbulent flow passes through a set of inlet guide vanes (IGVs) and then interacts with the propeller blades: this process creates unwanted vibration and sound. The purpose of this research is to determine if the arrangement of the IGVs can be used to reduce the propulsor noise generation. In this study the incoming flow to the propeller is modeled as homogeneous turbulence and the IGVs are represented by a cascade of flat plates. We will consider the equations, which describe the blade response to an incoming harmonic gust, and we will represent the turbulent flow using a modal description.
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Date Issued: 2003
PURL: http://purl.flvc.org/fcla/dt/12971
Subject Headings: Blades, Turbulence, Cascades (Fluid dynamics)
Format: Document (PDF)

Title: STUDY OF THE WIDE-BAND SPECTRUM FATIGUE ON WELDED OFFSHORE STRUCTURES.
Creator: CHU, ZIN-HON., Florida Atlantic University, Hartt, William H.
Abstract/Description: In the present research butt welded ABS DH-32 steel specimens were fatigue tested under freely corroding and cathodic protection conditions by a time-series simulated wide-band spectra of a North Sea wave climate. Previous research pertaining to the probabilistic features of wave dynamics, wave force models, Markov-Chain sea state evolution and time-series simulation of wide-band spectra are addressed as a background review. The resulting freely corroding data are discussed on the basis of...
Show moreIn the present research butt welded ABS DH-32 steel specimens were fatigue tested under freely corroding and cathodic protection conditions by a time-series simulated wide-band spectra of a North Sea wave climate. Previous research pertaining to the probabilistic features of wave dynamics, wave force models, Markov-Chain sea state evolution and time-series simulation of wide-band spectra are addressed as a background review. The resulting freely corroding data are discussed on the basis of the SN plot which developed from the previous investigations at FAU. Calculation of the damage of failed specimens by employing the "Equivalent Narrow-Band Approach" resulted in excellent agreement with the linear damage summation assumption.
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Date Issued: 1985
PURL: http://purl.flvc.org/fcla/dt/14266
Subject Headings: Steel--Fatigue, Steel--Corrosion
Format: Document (PDF)

Title: Non-separable two dimensional wavelets and their filter banks in polar coordinates.
Creator: Andric, Oleg., Florida Atlantic University, Erdol, Nurgun
Abstract/Description: The problems encountered in development and implementation of orthonormal two dimensional wavelet bases and their filter banks in polar coordinates are addressed. These wavelets and filter banks have possible applications in processing signals that are collected by sensors working in the polar coordinate system, such as biomedical and radar generated signals. The relationship between the space of measurable, square-integrable functions on the punctured polar coordinate system L^2(P) and space...
Show moreThe problems encountered in development and implementation of orthonormal two dimensional wavelet bases and their filter banks in polar coordinates are addressed. These wavelets and filter banks have possible applications in processing signals that are collected by sensors working in the polar coordinate system, such as biomedical and radar generated signals. The relationship between the space of measurable, square-integrable functions on the punctured polar coordinate system L^2(P) and space of measurable, square-integrable functions on the rectangular plane L^2(R^2) is developed. This allows us to develop complete wavelet bases in a more convenient and familiar surrounding of L^2(R^2) and to transport this theory to L^2(P). Corresponding filter banks are also developed. The implementation of wavelet analysis of punctured polar plane is discussed. An example of wavelet bases, filter banks, and implementation is provided.
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Date Issued: 1995
PURL: http://purl.flvc.org/fcla/dt/15190
Subject Headings: Wavelets (Mathematics), Coordinates, Polar, Signal processing--Mathematical models
Format: Document (PDF)

Title: Novel multiplexer-based architectures for full adder design.
Creator: Al-Sheraidah, Abdulkarim K., Florida Atlantic University, Wang, Yuke
Abstract/Description: We propose five new Multiplexer-Based architectures for 1-bit full adder design. Using a 2-transistors multiplexer gate to implement the first architecture, we are able to produce a 12-transistor full adder cell, Comparing it to four different 10-transistors low-power full adder cells reported previously in literature, the new adder cell named MBA1-12T out performs all of them in power consumption and speed. By implementing those architectures using the 2-input CMOS multiplexer with pass...
Show moreWe propose five new Multiplexer-Based architectures for 1-bit full adder design. Using a 2-transistors multiplexer gate to implement the first architecture, we are able to produce a 12-transistor full adder cell, Comparing it to four different 10-transistors low-power full adder cells reported previously in literature, the new adder cell named MBA1-12T out performs all of them in power consumption and speed. By implementing those architectures using the 2-input CMOS multiplexer with pass-gates, five new high-performance full adder cells are obtained. Those new adder cells are tested along with the conventional 28-transistor CMOS adder cell. Testing results shows that the new adder cells have higher speed and lower power delay product values than the conventional 28-transistor CMOS adder cell.
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Date Issued: 2000
PURL: http://purl.flvc.org/fcla/dt/12667
Subject Headings: Metal oxide semiconductors, Complementary, Digital integrated circuits
Format: Document (PDF)

Title: TRANSMISSION-LINE-MATRIX MODELING OF INHOMOGENEOUS RECTANGULAR WAVEGUIDES AND CAVITIES.
Creator: Agba, Lawrence C., Florida Atlantic University, Sadiku, Matthew
Abstract/Description: Fortran algorithms were developed to analyze inhomogeneous rectangular waveguides and cavities using the method of transmission-line-matrix. These algorithms were used specifically to determine the field components, impedances, modes, and power decay rates. The computations were done in one, two or three space dimensions and time. Results obtained were compared with analytical results, where possible. In general, the results were found to be in better agreement with the analytical results...
Show moreFortran algorithms were developed to analyze inhomogeneous rectangular waveguides and cavities using the method of transmission-line-matrix. These algorithms were used specifically to determine the field components, impedances, modes, and power decay rates. The computations were done in one, two or three space dimensions and time. Results obtained were compared with analytical results, where possible. In general, the results were found to be in better agreement with the analytical results than the results obtained using other numerical method.
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Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14378
Subject Headings: Electromagnetic waves--Mathematical models
Format: Document (PDF)

Title: Target signature for a periodic structure using a low-frequency broadband side-scan simulator.
Creator: Dietz, Jerrold Edward Gilbert., Florida Atlantic University, LeBlanc, Lester R.
Abstract/Description: Many acoustic targets of interest contain features that are periodic in space. This thesis demonstrates that a chirp waveform, 2 kHz to 12 kHz, can detect repetitive structures with periods in the range of 0.125 m to 0.75 m. As aspect angle increases from 0 deg to 90 deg, a frequency shift in the range of 830 Hz to 4800 Hz will occur as the period decreases from 0.75 to 0.125 m. It follows that, spectral analysis can aid in target identification. A sonar propagation model has been developed...
Show moreMany acoustic targets of interest contain features that are periodic in space. This thesis demonstrates that a chirp waveform, 2 kHz to 12 kHz, can detect repetitive structures with periods in the range of 0.125 m to 0.75 m. As aspect angle increases from 0 deg to 90 deg, a frequency shift in the range of 830 Hz to 4800 Hz will occur as the period decreases from 0.75 to 0.125 m. It follows that, spectral analysis can aid in target identification. A sonar propagation model has been developed to simulate the acoustic backscattered energy of a target with periodic characteristics in the presence of seafloor scattering. Examining the spectral components, with appropriate time gating, can achieve a gain of 7 dB at 3100 m.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12788
Subject Headings: Sidescan sonar, Underwater acoustics, Scattering (Physics)
Format: Document (PDF)

Title: TWO-DIMENSIONAL MODELING OF A SOLAR POND.
Creator: CANCIO, GUILLERMO LEOPOLDO., Florida Atlantic University, Duyar, Ahmet
Abstract/Description: A two-dimensional mathematical model is developed to analyze the thermal behavior of salt gradient solar ponds. This model can be used to evaluate the suitability of solar ponds for space heating and power generation as well as the thermal storage capability of the ground. The solar pond model adopted consists of an upper nonconvective zone and a lower convective zone. This model incorporates detailed representation of surface and ground heat losses. Solutions to the energy equation are...
Show moreA two-dimensional mathematical model is developed to analyze the thermal behavior of salt gradient solar ponds. This model can be used to evaluate the suitability of solar ponds for space heating and power generation as well as the thermal storage capability of the ground. The solar pond model adopted consists of an upper nonconvective zone and a lower convective zone. This model incorporates detailed representation of surface and ground heat losses. Solutions to the energy equation are obtained for both the pond and the ground. The energy equation for the lower convective zone is used to determine the energy that can be extracted from the pond.
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Date Issued: 1984
PURL: http://purl.flvc.org/fcla/dt/14174
Subject Headings: Solar ponds, Energy storage
Format: Document (PDF)

Title: Theory of and a novel approach to high-stability frequency control circuits.
Creator: Brunell, David J., Florida Atlantic University, Bagby, Jonathan S.
Abstract/Description: Portable, wireless devices have become ubiquitous, and ever-increasing requirements of functionality and reliability are being placed upon these devices. There is a need to accommodate the oft-conflicting requirements of small size, low power consumption, low cost, and extremely accurate control of frequency. To address these RF design requirements, a comprehensive survey of existing frequency-control methods is presented, followed by a novel design which accomplishes a high degree of...
Show morePortable, wireless devices have become ubiquitous, and ever-increasing requirements of functionality and reliability are being placed upon these devices. There is a need to accommodate the oft-conflicting requirements of small size, low power consumption, low cost, and extremely accurate control of frequency. To address these RF design requirements, a comprehensive survey of existing frequency-control methods is presented, followed by a novel design which accomplishes a high degree of frequency accuracy through the use of direct digital synthesis and a software seeking algorithm. The proposed design can be implemented pursuant to the requirements of current and future portable wireless devices.
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Date Issued: 2001
PURL: http://purl.flvc.org/fcla/dt/12819
Subject Headings: Frequency synthesizers, Automatic frequency control, Oscillators, Crystal
Format: Document (PDF)

Title: Varactors, crystals, and their use in voltage controlled oscillators.
Creator: Fenton, Eliot Darrel., Florida Atlantic University, Ungvichian, Vichate
Abstract/Description: This thesis investigates the characteristics of varactors and crystals that affect Q and therefore the frequency stability of a voltage controlled oscillator (vco) when employed in a one MHz to three hundred MHz frequency synthesizer. A low noise VHF crystal oscillator, a low noise common base UHF oscillator, and a low noise test set-up are described, built, and tested.
Date Issued: 1991
PURL: http://purl.flvc.org/fcla/dt/14676
Subject Headings: Oscillators, Electric, Oscillators, Crystal
Format: Document (PDF)

Title: VIBRATION ANALYSIS OF RECTANGULAR PLATES WITH COMPLETE AND PARTIAL CONSTRAINED-LAYER DAMPING TREATMENTS.
Creator: HSU, HONG-YUAN., Florida Atlantic University, Stevens, Karl K.
Abstract/Description: A theoretical analysis for predicting the system loss factors and natural frequencies of rectangular plates with complete and partial constrained-layer damping treatments has been presented. This analysis is based upon an energy approach to the free vibration of plates. Results predicted were compared with those from experiments. Satisfactory agreement has been reached. Both the theoretical and the experimental results presented in this thesis indicate clearly that partial constrained-layer...
Show moreA theoretical analysis for predicting the system loss factors and natural frequencies of rectangular plates with complete and partial constrained-layer damping treatments has been presented. This analysis is based upon an energy approach to the free vibration of plates. Results predicted were compared with those from experiments. Satisfactory agreement has been reached. Both the theoretical and the experimental results presented in this thesis indicate clearly that partial constrained-layer damping treatments can provide effective, or even superior, amounts of damping, and that their use can lead to significant savings in material costs and weight.
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Date Issued: 1983
PURL: http://purl.flvc.org/fcla/dt/14160
Subject Headings: Damping (Mechanics), Vibration, Plates (Engineering)--Vibration
Format: Document (PDF)

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