View All Items

Title: INVESTIGATION OF CORROSION OF REINFORCING STEEL BY USING ULTRASONIC TECHNIQUES AND SPECTRAL ANALYSIS.
Creator: WANG, YUN YU, Florida Atlantic University
Abstract/Description: In this investigation an ultrasonic technique and spectral analysis were employed to detect corrosion of reinforcing steel in concrete under conditions of accelerated testing. Various properties of a transmitted ultrasonic pulse were determined, and it was concluded that the transfer function provided the most realistic possibility for detection of corrosion and cracking. The most meaningful correlations of the transfer function with corrosion and cracking events were for situations where the...
Show moreIn this investigation an ultrasonic technique and spectral analysis were employed to detect corrosion of reinforcing steel in concrete under conditions of accelerated testing. Various properties of a transmitted ultrasonic pulse were determined, and it was concluded that the transfer function provided the most realistic possibility for detection of corrosion and cracking. The most meaningful correlations of the transfer function with corrosion and cracking events were for situations where the temporal variation of the transfer function at the particular frequency was small. The appropriateness of ultrasonic parameters with regard to problems involving corrosion of reinforcing steel is discussed.
Show less
Date Issued: 1979
PURL: http://purl.flvc.org/fcla/dt/14006
Subject Headings: Concrete--Corrosion, Seawater Corrosion
Format: Document (PDF)

Title: PREPARING FOR SMOOTH TRANSITION TO ISDN (INTEGRATED SERVICES DIGITAL NETWORK).
Creator: EHLEY, GLENN A., Florida Atlantic University
Abstract/Description: This thesis deals with the major issues concerning a smooth transition into the Integrated Services Digital Network (ISDN). The goals of technology improvements, cost/performance effectiveness, user acceptance of ISDN services, converting the network to an all digital network, and standardization are essential for the economic acceptance by the ISDN user. The uses of ISDN are not completely known, it is therefore very difficult to accurately plan the ISDN network. Because of this uncertainty,...
Show moreThis thesis deals with the major issues concerning a smooth transition into the Integrated Services Digital Network (ISDN). The goals of technology improvements, cost/performance effectiveness, user acceptance of ISDN services, converting the network to an all digital network, and standardization are essential for the economic acceptance by the ISDN user. The uses of ISDN are not completely known, it is therefore very difficult to accurately plan the ISDN network. Because of this uncertainty, the call holding time is difficult to determine. This thesis shows the effects on the D channel occupancy by varying both the call holding time along with varying the packet data over the signaling channel. It is shown that a low call holding time drastically increases the traffic load over the D channel.
Show less
Date Issued: 1987
PURL: http://purl.flvc.org/fcla/dt/14414
Subject Headings: Integrated services digital networks
Format: Document (PDF)

Title: STRUCTURAL INTEGRITY OF CALCAREOUS DEPOSIT - REHABILITATED MARINE REINFORCED CONCRETE.
Creator: DOHLEN, STENER., Florida Atlantic University
Abstract/Description: Corrosion-induced spalling of reinforced concrete and prestressed concrete is a major problem in coastal structures. Statistics on the rehabilitation and replacement of damaged concrete in the U.S.A. indicates substantial expenditure. This study is an investigation of the use of electro-deposited minerals for in-situ concrete repair in a cost-effective manner to extend the service life for marine reinforced concrete structures. During the first phase of this investigation, the reinforcing...
Show moreCorrosion-induced spalling of reinforced concrete and prestressed concrete is a major problem in coastal structures. Statistics on the rehabilitation and replacement of damaged concrete in the U.S.A. indicates substantial expenditure. This study is an investigation of the use of electro-deposited minerals for in-situ concrete repair in a cost-effective manner to extend the service life for marine reinforced concrete structures. During the first phase of this investigation, the reinforcing steel in specimens was corroded by an impressed voltage technique to a point where concrete cracking occurred. The second phase addressed the rehabilitation in which the calcareous deposits were precipitated in the cracks by an impressed cathodic current. This investigation included both laboratory testing with once-through circulating seawater and field testing in the ocean environment. The findings indicate that the structural strength of the concrete specimens decreased as a result of the impressed voltage.
Show less
Date Issued: 1988
PURL: http://purl.flvc.org/fcla/dt/14407
Subject Headings: Reinforced concrete--Cracking, Seawater
Format: Document (PDF)

Title: MICROPROCESSOR SONAR SYSTEM.
Creator: SHABIB, HASSAN MARWAN, Florida Atlantic University
Abstract/Description: This thesis presents the development of a microprocessor based navigational system. The integrated system is capable of determining depth to the bottom, distance to the surface, and velocity of a deep towed submersible. The system also alerts the user to any reduction to forward safe distance limit. A discussion of the hardware used to gather the data is presented. Software development is discussed in great detail. The system utilizes the Sixty Five Hundred microprocessor family. Advantages...
Show moreThis thesis presents the development of a microprocessor based navigational system. The integrated system is capable of determining depth to the bottom, distance to the surface, and velocity of a deep towed submersible. The system also alerts the user to any reduction to forward safe distance limit. A discussion of the hardware used to gather the data is presented. Software development is discussed in great detail. The system utilizes the Sixty Five Hundred microprocessor family. Advantages include cost effectiveness and application versatility.
Show less
Date Issued: 1980
PURL: http://purl.flvc.org/fcla/dt/14008
Subject Headings: Microprocessors--Programming, Sonar
Format: Document (PDF)

Title: THE INFLUENCE OF CATHODIC PROTECTION UPON CONSTANT DEFLECTION FATIGUE TESTS ON NOTCHED 1018 STEEL IN SEA WATER.
Creator: MARTIN, PHILIP EDWARD, Florida Atlantic University
Abstract/Description: Constant deflection fatigue experiments performed on cathodically protected, notched steel bars in natural sea water produced stresses which caused short cracks to appear soon after the beginning of testing . At stresses above 22 ksi (152 MN/m^2), cracks grew continuously across the bars. At stresses below 22 ksi (152 MN/m^2), and at potentials of -1.20 volts , saturated calomel electrode SCE, cracks did not grow, or arrested part way across the bar. At potentials other than - 1.20 volts ,...
Show moreConstant deflection fatigue experiments performed on cathodically protected, notched steel bars in natural sea water produced stresses which caused short cracks to appear soon after the beginning of testing . At stresses above 22 ksi (152 MN/m^2), cracks grew continuously across the bars. At stresses below 22 ksi (152 MN/m^2), and at potentials of -1.20 volts , saturated calomel electrode SCE, cracks did not grow, or arrested part way across the bar. At potentials other than - 1.20 volts , SCE, stress levels had to be less than 19 ksi (131 MN/m^2), before crack growth could be arrested. Strain gage readings suggest calcareous material may be forming on the fracture surfaces of cracks in which growth was arrested. Examination of these surfaces shows a pattern of calcareous deposit and corrosion product which suggests a potential gradient within the crack electrolyte. A mathematical model is presented which describes this potential gradient.
Show less
Date Issued: 1979
PURL: http://purl.flvc.org/fcla/dt/13986
Subject Headings: Steel--Fatigue
Format: Document (PDF)

Title: FREQUENCY DEPENDENCE OF SEA WATER CORROSION FATIGUE OF NOTCHED 1018 STEEL.
Creator: HENKE, THOMAS ELMER, Florida Atlantic University
Abstract/Description: Experiments were conducted to investigate frequency dependence of sea water corrosion fatigue of notched 1018 steel under constant deflection, reverse bend test conditions. Frequencies of 1850, 1200, and 600 cycles per minute (CPM) were studied. Results indicate that frequency effects are not observed at high stresses, apparently due to the mechanical damage component of the fatigue process dominating over corrosion considerations. At low stresses reduced frequency resulted in decreased...
Show moreExperiments were conducted to investigate frequency dependence of sea water corrosion fatigue of notched 1018 steel under constant deflection, reverse bend test conditions. Frequencies of 1850, 1200, and 600 cycles per minute (CPM) were studied. Results indicate that frequency effects are not observed at high stresses, apparently due to the mechanical damage component of the fatigue process dominating over corrosion considerations. At low stresses reduced frequency resulted in decreased cycles to failure. Acidification of the crack tip solution is proposed as possibly responsible for this behavior. For specimens subjected to equal stress levels in the frequency dependent region, greater cathodic protection is required to mitigate corrosion fatigue for 600 CPM specimens (-0.86 volts standard calomel electrode) (V SCE) than for 1850 CPM specimens (-079V SCE).
Show less
Date Issued: 1975
PURL: http://purl.flvc.org/fcla/dt/13731
Subject Headings: Steel--Corrosion, Seawater
Format: Document (PDF)

Title: AN ANALYTICAL STUDY OF THE DYNAMIC CHARACTERISTICS OF TOWED FLEXIBLE CYLINDERS.
Creator: KOMROWER, JEFFREY MARC, Florida Atlantic University
Abstract/Description: A linear differential equation of motion to describe the fluid-induced vibrations of a towed flexible cylinder, with applications toward towed array system, is developed. The equation is explored for its free vibration characteristics with the aid of a computer program. The behavior of the locus of the several lowest eigenfrequencies, as system parameters were varied revealed the basic dependence of the system on these parameters. It is shown that for various combinations of system parameters...
Show moreA linear differential equation of motion to describe the fluid-induced vibrations of a towed flexible cylinder, with applications toward towed array system, is developed. The equation is explored for its free vibration characteristics with the aid of a computer program. The behavior of the locus of the several lowest eigenfrequencies, as system parameters were varied revealed the basic dependence of the system on these parameters. It is shown that for various combinations of system parameters, the system may be subject to buckling or oscillatory instabilities in its lower flexural modes. It was found that (1) longer cylinders are more susceptible to oscillatory instabilities than are shorter cylinders but are less susceptible to buckling, (2) tension due to skin friction drag stabilizes the system, and (3) the tail of the cylinder acts as an initiator of unstable motions. Nomographs are presented to predict natural frequencies for various combinations of system parameters.
Show less
Date Issued: 1979
PURL: http://purl.flvc.org/fcla/dt/13978
Subject Headings: Cylinders--Testing
Format: Document (PDF)

Title: A new approach to the inverse kinematic analysis of redundant robots.
Creator: Dutta, Partha Sarathi., Florida Atlantic University
Abstract/Description: A new approach has been developed for inverse kinematic analysis of redundant robots. In case of redundant robots inverse kinematics is complicated by the non-square nature of the Jacobian. In this method the Jacobian and inverse kinematic equation are reduced based on the rank of the Jacobian and the constraints specified. This process automatically locks some joints of the robot at various trajectory points. The reduced inverse kinematic equation is solved by an iterative procedure to find...
Show moreA new approach has been developed for inverse kinematic analysis of redundant robots. In case of redundant robots inverse kinematics is complicated by the non-square nature of the Jacobian. In this method the Jacobian and inverse kinematic equation are reduced based on the rank of the Jacobian and the constraints specified. This process automatically locks some joints of the robot at various trajectory points. The reduced inverse kinematic equation is solved by an iterative procedure to find joint variable values for known task description. The results of computer simulation of the inverse kinematics applied on a redundant planar robot and a redundant moving base robot proved the method to be efficient, and the results can be found within a few iterations with excellent accuracy.
Show less
Date Issued: 1988
PURL: http://purl.flvc.org/fcla/dt/14433
Subject Headings: Parallel processing (Electronic computers), Computer programs, coding theory, Supercomputers
Format: Document (PDF)

Title: Boundary Layer Control on a Circular Cylindrical Body through Oscillating Lorentz Forcing.
Creator: Seltzer, Ryan K., Dhanak, Manhar R., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Boundary layer control on a circular cylindrical body through oscillating Lorentz forcing is studied by means of numerical simulation of the vorticity-stream function formulation of the Navier-Stokes equations. The model problem considers axisymmetric seawater flow along an infinite cylinder controlled by an idealized radially directed Lorentz force oscillating spatially and temporally. Under optimum forcing parameters, it is shown that sustainable Lorentz induced vortex rings can travel...
Show moreBoundary layer control on a circular cylindrical body through oscillating Lorentz forcing is studied by means of numerical simulation of the vorticity-stream function formulation of the Navier-Stokes equations. The model problem considers axisymmetric seawater flow along an infinite cylinder controlled by an idealized radially directed Lorentz force oscillating spatially and temporally. Under optimum forcing parameters, it is shown that sustainable Lorentz induced vortex rings can travel along the cylinder at a speed equivalent to the phase speed of forcing . Wall stress is shown to locally change sign in the region adjacent to the vortex, considerably decreasing net viscous drag . Adverse flow behaviors are revealed as a result of studying the effects of the Reynolds numbers, strength of the Lorentz force, and phase speed of forcing for boundary layer control. Adverse flow behaviors inc I ude complex vortex configurations found for suboptimal forcing resulting in a considerable increase in wall stress.
Show less
Date Issued: 2007
PURL: http://purl.flvc.org/fau/fd/FA00012549
Subject Headings: Mathematical physics, Lorentz transformations, Boundary layer control, Fluid dynamics
Format: Document (PDF)

Title: Effects of POSS Fiber Sizing on the Mechanical and Thermal Properties of CarbonNinyl Ester Composites.
Creator: Powell, Felicia M., Mahfuz, Hassan, Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The degradation of polymer composites in moist environments is a limiting factor in the advancement of composite technology. The key to mitigate this degradation is to maintain the integrity of the fiber/matrix (F/M) interface. In this study, the F/M interface of carbon/vinyl ester composites has been modified by treating the carbon fiber with polyhedral oligomeric silsesquioxane (POSS). Two POSS systems, namely octaisobutyl and trisilanolphenyl, have been investigated. A set of chemical and...
Show moreThe degradation of polymer composites in moist environments is a limiting factor in the advancement of composite technology. The key to mitigate this degradation is to maintain the integrity of the fiber/matrix (F/M) interface. In this study, the F/M interface of carbon/vinyl ester composites has been modified by treating the carbon fiber with polyhedral oligomeric silsesquioxane (POSS). Two POSS systems, namely octaisobutyl and trisilanolphenyl, have been investigated. A set of chemical and mechanical procedures has been developed to coat carbon fibers with POSS, and fabricate layered composites using vinyl ester resin. lnterlaminar shear, transverse tension, and low velocity impact tests on composites have indicated around 10-38% improvement in mechanical properties with respect to control samples. Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) tests have also shown significant improvement in glass transition temperature (T9). Hygrothermal tests, under various environments, have demonstrated that POSS reduces water absorption by 20-30%.
Show less
Date Issued: 2009
PURL: http://purl.flvc.org/fau/fd/FA00012540
Subject Headings: Surface chemistry, Composite materials--Biodegradation, Carbon compounds--Testing, Thermodynamics, Fibrous compounds--Testing
Format: Document (PDF)

Title: Dynamic analysis of single- and multi-module platforms in waves.
Creator: Kling, Kaylie Ann., Florida Atlantic University, Ananthakrishnan, Palaniswamy, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The response of single- and multi-module floating platforms to surface waves is investigated theoretically. Wave exciting forces are computed using methods based on the Morrison equation and Froude-Krylov hypothesis. The radiation forces are obtained from experimental results of Vugt and where possible diffraction forces using the Haskind reciprocity relation. Heave and pitch response of a one-module platform and hinge-connected two-module platform are determined by integrating the...
Show moreThe response of single- and multi-module floating platforms to surface waves is investigated theoretically. Wave exciting forces are computed using methods based on the Morrison equation and Froude-Krylov hypothesis. The radiation forces are obtained from experimental results of Vugt and where possible diffraction forces using the Haskind reciprocity relation. Heave and pitch response of a one-module platform and hinge-connected two-module platform are determined by integrating the corresponding equations of rigid-body motion. A structural dynamic analysis is also carried out using the Green's function method to determine the elastic flexural response of the platform to waves. The results are compared with the experimental and numerical findings of others. The thesis contributes to a better understanding of rigid-body and elastic response of large ocean platforms subject to wave forces. The methodology is computationally less intensive and therefore can be effectively used for the design of platforms and the validation of numerical algorithms.
Show less
Date Issued: 2006
PURL: http://purl.flvc.org/fcla/dt/13399
Subject Headings: Ocean engineering, Wave motion, Theory of, Water waves--Mathematical models, Drilling platforms, Extreme value theory
Format: Document (PDF)

Title: Evaluation of Water Degradation ofPolymer Matrix Composites by Micromechanical and Macromechanical Tests.
Creator: Ramirez, Felipe A., Carlsson, Leif A., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: Degradation of the critical components of polymer matrix composites in marine environments had been experimentally investigated. Water absorption behavior of neat resin and composite specimens was examined. The tensile strength of fibers was monitored using the single filament test. The mechanical properties of the resins were monitored by tensile, flexure, and dynamic-mechanical tests. In addition, matrix shrinkage during cure and matrix swelling after immersion in water were monitored. The...
Show moreDegradation of the critical components of polymer matrix composites in marine environments had been experimentally investigated. Water absorption behavior of neat resin and composite specimens was examined. The tensile strength of fibers was monitored using the single filament test. The mechanical properties of the resins were monitored by tensile, flexure, and dynamic-mechanical tests. In addition, matrix shrinkage during cure and matrix swelling after immersion in water were monitored. The integrity of the fiber/matrix (F/M) interface of the composite systems was studied using the single fiber fragmentation test (SFFT). Macroscopic composites were examined using transverse tensile and transverse flexure tests to study the influence of the integrity of the matrix and F/M interface on the macroscopic response. In addition, for characterization of F/M debonding in the SFFT, a fracture mechanics model and modified test procedure were developed.
Show less
Date Issued: 2008
PURL: http://purl.flvc.org/fau/fd/FA00012543
Subject Headings: Composite materials--Mechanical properties, Polymeric composites--Testing, Fibrous composites--Testing, Polymers--Deterioration
Format: Document (PDF)

Title: 2006-2007 Program Review Computer Science and Engineering.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2006-2007
PURL: http://purl.flvc.org/fau/fd/FA00007722
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2006-2007 Program Review Electrical Engineering.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2006-2007
PURL: http://purl.flvc.org/fau/fd/FA00007723
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2013-2014
PURL: http://purl.flvc.org/fau/fd/FA00007736
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2014-2015
PURL: http://purl.flvc.org/fau/fd/FA00007739
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2012-2013
PURL: http://purl.flvc.org/fau/fd/FA00007733
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2010-2011
PURL: http://purl.flvc.org/fau/fd/FA00007730
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2009-2010
PURL: http://purl.flvc.org/fau/fd/FA00007727
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

Title: 2009-2010 Program Review Computer and Electrical Engineering and Computer Science.
Creator: Florida Atlantic University, Department of Computer and Electrical Engineering and Computer Science, College of Engineering and Computer Science
Abstract/Description: Florida Atlantic University Departmental Dashboard Indicators. Department program reviews for College of Engineering and Computer Science, Florida Atlantic University.
Date Issued: 2016-2017
PURL: http://purl.flvc.org/fau/fd/FA00007745
Subject Headings: Florida Atlantic University -- History
Format: Document (PDF)

FAU Theses and Dissertations (1718)	+ -
FAU College Collections (27)	+ -

Neural networks (Computer science) (60)	+ -
Wireless communication systems (50)	+ -
Machine learning (45)	+ -
Computer software--Quality control (40)	+ -
Underwater acoustics (36)	+ -

Computer network protocols (34)	+ -
Algorithms (29)	+ -
Robotics (29)	+ -
Computer algorithms (27)	+ -
Software engineering (27)	+ -
Artificial intelligence (26)	+ -
Florida Atlantic University -- History (26)	+ -
Software measurement (26)	+ -
Finite element method (25)	+ -
Fault-tolerant computing (24)	+ -
Computer networks (23)	+ -
Computer architecture (21)	+ -
Deep learning (Machine learning) (21)	+ -
Computer security (20)	+ -
Fluid dynamics (20)	+ -
Image processing--Digital techniques (20)	+ -
Steel--Corrosion (20)	+ -
Mobile computing (19)	+ -
Cathodic protection (18)	+ -
Expert systems (Computer science) (18)	+ -
Hydrodynamics (18)	+ -
Signal processing--Digital techniques (18)	+ -
Computer software--Development (17)	+ -
Fracture mechanics (17)	+ -
Reinforced concrete--Corrosion (17)	+ -

Electronic Thesis or Dissertation (1718)	+ -
Program Review (26)	+ -
conference publication (12)	+ -

Florida Atlantic University (1744)	+ -
College of Engineering and Computer Science (1361)	+ -
Department of Computer and Electrical Engineering and Computer Science (653)	+ -
Department of Ocean and Mechanical Engineering (565)	+ -
Department of Civil, Environmental and Geomatics Engineering (142)	+ -

Search In

Pages

Pages

Sort Results By:

Narrow results by:

Collection

Topical Subject

Genre

Type of Resource

Language

Creator

Format

Owner

Document (PDF) (1756)	+ -
Serial (1)	+ -