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Articles 1 - 30 of 36
Full-Text Articles in Engineering
Sediment Resuspension Due To Waves Generated By Recreational Motorboats In Shallow Lakes, Carl R. Larrabee
Sediment Resuspension Due To Waves Generated By Recreational Motorboats In Shallow Lakes, Carl R. Larrabee
Retrospective Theses and Dissertations
Sediment resuspension due to the operation of recreational motorboats in shallow lakes was investigated. Boats equipped with 28, 50, 85, 120, and 165 horsepower engines were used for this study on Lake Claire, Florida Technological University campus, and Lake Mizell, the City of Winter Park, located in Orange County, Central Florida. Grasshopper Lake was also a test site due to its clarity for underwater photography. These motorboats were run at different speeds and water depths and the induced pressure waves on the lake bottom were measured using a hydrophone and recording system. Primary and secondary wave amplitudes and frequencies were …
The Application Of Limit Analysis To Shell Structures Using Existing Finite Element Analysis Codes, George G. Myers
The Application Of Limit Analysis To Shell Structures Using Existing Finite Element Analysis Codes, George G. Myers
Retrospective Theses and Dissertations
A ramjet inlet duct structure has been designed using nonlinear structural analysis to allow local plastic deformations which result in structural weight reduction. To establish the feasibility of reduced shell thickness, the Lower-Bound Theorem of limit analysis has been applied using an existing finite element analysis computer code intended for elastic analysis. The results of the analysis were verified by structural testing. Predicted stresses and deflections showed good correlation with measured values up to the point of failure. This work was supported by the U.S. Air Force Aero Propulsion Laboratory, Wright-Patterson Air Force Base, Ohio, under Contract No. F33615-72-C-1366.
The Design And Analysis Of A Rare Earth Iron Magnetostrictive Underwater Sound Transducer, Steven Wayne Meeks
The Design And Analysis Of A Rare Earth Iron Magnetostrictive Underwater Sound Transducer, Steven Wayne Meeks
Retrospective Theses and Dissertations
The design and analysis of a low-frequency, resonant, tonpilz type, rare earth iron underwater sound transducer using rods of Tb.27Dy.73Fe1.95 are described. An equivalent circuit is presented which predicts the performance of the transducer in the presence of eddy currents and demagnetization. The effect of eddy currents on the impedance of a rod is discussed. The predicted performance of a laminated transducer is compared with that of an unlaminated transducer. The performance of the rare earth iron transducer is compared with the performance of the same transducer with identical ceramic active elements. Data on transmitting current response, transmitting voltage response, …
The Silicon Solar Cell As An Optical Detector, Stephen O. Saltsman
The Silicon Solar Cell As An Optical Detector, Stephen O. Saltsman
Retrospective Theses and Dissertations
The optical detector characteristics of a silicon solar cell are examined. A general equivalent circuit model is developed and typical parameter values are determined. A comparison is made between the photovoltaic and short circuit operating modes and the short circuit mode is shown to be preferable in terms of linearity, extended frequency response, and temperature stability. A method is developed to determine the noise characteristics of the amplifier-detector system used in the short circuit mode. The silicon solar cell is shown to be an economical alternative to standard photodiodes in low to medium data rate systems.
Hardware And Software Considerations For Improving The Throughput Of Scientific Computation Computers, Glenn Allen Sullivan
Hardware And Software Considerations For Improving The Throughput Of Scientific Computation Computers, Glenn Allen Sullivan
Retrospective Theses and Dissertations
In this paper, hardware and software techniques are presented for improving the Throughput (defined as computations per dollar) of computing systems which are oriented towards high-precision floating point computations. The various improvements are referenced to a baseline of the PDP 11/20, the NOVA 1200, and the TI 960A, all 16 bit minicomputers. The most beneficial hardware improvement is the inclusion of a Floating Point Processor, which yields up to 200X Throughput increase over a software floating point package. The inclusion of a cache high speed local memory and the availability of Polish Notation format instructions are shown to provide less …
Methods And Techniques Used For Job Shop Scheduling, Yoo Baik Yang
Methods And Techniques Used For Job Shop Scheduling, Yoo Baik Yang
Retrospective Theses and Dissertations
The job shop scheduling problem, in which we must determine the order or sequence for processing a set of jobs through several machines in an optimum manner, has received considerable attention. In this paper a number of the methods and techniques are reviewed and an attempt to categorize them according to their appropriateness for effective use in job shop scheduling has been made. Approaches are classified in two categories: a) analytical techniques and b) graphical methods. Also, it should be noticed that this report does not include all the attempts and trials, especially the heuristic approaches.
Application Of Fire Protection Models In Urban Planning, Ronald George Thomas
Application Of Fire Protection Models In Urban Planning, Ronald George Thomas
Retrospective Theses and Dissertations
No abstract provided.
Aging Characteristics Of An Aluminum-4.5% Copper-1.5% Magnesium Alloy, Robert Earl Sulouff
Aging Characteristics Of An Aluminum-4.5% Copper-1.5% Magnesium Alloy, Robert Earl Sulouff
Retrospective Theses and Dissertations
The effects of quenching conditions, single-step and two-step aging treatments on the tensile properties of an AL-4.5%Cu-1.5%Mg alloy has been investigated. Results indicate that two distinctly different precipitates of GPB and S' form during aging. Single-step aging at 140°C , 160°C and 190°C indicated that 24 hours at 160°C produced optimum strength (67 ksi UTS). Two-step aging for 3 days at 140°C plus 190°C resulted in a slight increase in strength over single step aging at 190°C. Slow (oil) quenching as well as direct quenching improved the tensile properties when aged at 190°C. Reversion occurred slowly over the temperature range …
Nose Tip Recession Measuring System For Hypersonic Test Vehicles, James Anthony Brown
Nose Tip Recession Measuring System For Hypersonic Test Vehicles, James Anthony Brown
Retrospective Theses and Dissertations
A method is presented which permits the measure of nose tip recession of re-entry vehicles and advanced terminal interceptors by employing a double choked flow coolant gas system. Recession of the tip results in an increased exit flow area which reduces the total pressure of the gas in the blast tube. Measurement of the blast tube pressure and gas generator (chamber) pressure will produce an effective measurement of the nose tip recession as long as choked flow (i.e., sonic velocity) is maintained in both the tip exit area and the gas generator throat area. Governing flow equations documented in the …
Analysis Of Switching Regulator Power Supply, Chang Il Lee
Analysis Of Switching Regulator Power Supply, Chang Il Lee
Retrospective Theses and Dissertations
No abstract provided.
Modeling The Silicon Solar Cell As An Optical Detector, Leo Albert Mallette
Modeling The Silicon Solar Cell As An Optical Detector, Leo Albert Mallette
Retrospective Theses and Dissertations
Solar cells have traditionally been used for a direct sunlight to energy conversion, and there has been relatively little investigation into their use as a low data rate optical detector. This report summarizes the results of experimental work to model a silicon solar cell, and its response to a pulse of light. A lumped circuit model, and governing equations for each of the elements is developed. Experimental data on several cells are used to curve fit the governing equations. The parameters of interest are tested as a function of both temperature, and background illumination. Having derived a working model, using …
Design And Thermal Performance Testing Of A Heat Pipe Flat Plate Solar Collector, Dennis N. Greeley
Design And Thermal Performance Testing Of A Heat Pipe Flat Plate Solar Collector, Dennis N. Greeley
Retrospective Theses and Dissertations
This thesis investigates the use of heat pipes for removing heat from flat plate solar collectors and transferring the energy to air in a space heating system. Heat pipes are passive devices which are very efficient at transporting heat energy. They operate using a closed evaporation-condensation cycle. This thesis presents the fundamentals of flat plate collectors, heat pipes, and a set of parameters for evaluating a heat pipe flat collector. Also included are the results of this project and the recommendations for improvements.
Distributed Computing Systems: An Overview, Haim Schwarzkopf
Distributed Computing Systems: An Overview, Haim Schwarzkopf
Retrospective Theses and Dissertations
Associative processors, parallel processors, content addressable parallel processors, networks, and other architectures have been around the computing scene as "Distributed Processing", for some time now. Several hundred papers have been written discussing their use and design but so far no academic work has tried to summarize the field called "Distributed Processing" using a systems approach. This research report attempts to remedy this lack. It attempts to gather into one place information that existed as of late 1976 in a format easily understandable by managers and systems engineers. The report deals also with certain issues of centralization and decentralization of EDP …
Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner
Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner
Retrospective Theses and Dissertations
No abstract provided.
An Optimization Model For Modular Incineration And Transfer Station Location In Municipal Solid Waste Systems, Ali Sajjadian
An Optimization Model For Modular Incineration And Transfer Station Location In Municipal Solid Waste Systems, Ali Sajjadian
Retrospective Theses and Dissertations
Facility location models presently available in solid waste management are reviewed. From these models, one is adapted and modified to optimally locate the modular incinerator plants and transfer stations in municipal solid waste systems. The criteria for optimization is developed in terms of minimum total costs of the system. The generation and composition of municipal solid waste at present, and projected estimates into the future, through the year 2000, are also presented. Recommendations are made for the use of modular incinerators and conservation of landfills and use of the optimization model for locating incinerator plants and transfer stations by the …
Simulation Of A Fiber-Optical Communication System, Patricia Kay Scheffel
Simulation Of A Fiber-Optical Communication System, Patricia Kay Scheffel
Retrospective Theses and Dissertations
The feasibility of analyzing an optical communication system using standard electronic circuit analysis programs such as SCEPTRE and ASTAP is demonstrated in this thesis. The transmitter (laser and modulator) and receiver (detector and amplifier) are modelled using equivalent circuits for the various components. The transmission medium (optical fiber) is modelled using an impulse response function. Two fibers are investigated--a step-index fiber and a square-law (parabolic index) fiber.
Aging Characteristics Of Al-4.5% Cu-1.4% Mg-0.5% Ag, James Kelly White
Aging Characteristics Of Al-4.5% Cu-1.4% Mg-0.5% Ag, James Kelly White
Retrospective Theses and Dissertations
The effects of single-step and two-step aging treatments on the tensile properties of an A1-4.5%Cu-1.4%Mg- 0.5%Ag alloy have been investigated. Results showed that a maximum ultimate tensile strength of 75 ksi can be attained by single-step aging 24 hr at 170°C. The two-step aging treatments consisting of first aging one week at 80°C followed by aging at 160° and 190°C led to lower strength properties than simple one-step aging. Reversion treatments applied to fully age-hardened alloy resulted in an almost progressive loss of strength in the 250° to 375° range.
A Hypothetical Model For System Safety In Air Transportation, Herbert Matthew Bowden
A Hypothetical Model For System Safety In Air Transportation, Herbert Matthew Bowden
Retrospective Theses and Dissertations
This thesis, "A Hypothetical Model for System Safety in Air Transportation," is addressed to an individual having a basic technical background and some familiarity with the air transportation system in the United States. The thesis identifies the need for the benefits to be obtained from a system-side program of safety activities. The organizational framework for implementation of a system safety program is presented as well as techniques of safety analysis.
Economic Feasibility Of Domestic Hot Water Heating By Solar Energy At Florida Community Colleges, Catherine Ann Colford
Economic Feasibility Of Domestic Hot Water Heating By Solar Energy At Florida Community Colleges, Catherine Ann Colford
Retrospective Theses and Dissertations
No abstract provided.
An Investigation Of A Variable Geometry Diffuser For Ftu's Four Inch Supersonic Wind Tunnel, William Robert Freed
An Investigation Of A Variable Geometry Diffuser For Ftu's Four Inch Supersonic Wind Tunnel, William Robert Freed
Retrospective Theses and Dissertations
The primary object of the investigation reported in this paper was to obtain information that would aid in the design of a more efficient diffuser for FTU's tunnel, and thus increase the run time. Presently FTU's four inch supersonic wind tunnel uses a constant area, normal shock, diffuser to recover the fluid pressure after the test section. Also, FTU's tunnel is of the intermittent blowdown type, which provides only a relatively short test time before the storage pressure decreases to a limiting value at which flow in the test section ceases to be supersonic. The use of a constant area …
A Solar Cooling System Model Formulation Using Trnsys, David E. Daniel
A Solar Cooling System Model Formulation Using Trnsys, David E. Daniel
Retrospective Theses and Dissertations
An absorption principal cooling system, currently proposed for installation and evaluation at the Florida Solar Energy Center (FSEC), is described as a system and modeled through use of "A Transient Simulation Program (TRNSYS)" developed by the University of Wisconsin. The system model included the FSEC building with its heat gains and losses due to insolation and conduction. System element and cooling load parameters are estimated and the basis of estimation is included to help identify adjustments required to fit the model to the final system installation as new or more complete data becomes available. Deficiencies noted in the current TRNSYS …
A Liquid Crystal Light Valve Used In A Remote Sensor, William Alexander Kownacki
A Liquid Crystal Light Valve Used In A Remote Sensor, William Alexander Kownacki
Retrospective Theses and Dissertations
A nematic liquid crystal cell is used in conjunction with a mirror retro-reflector to modulate a low-power laser beam. The object is to determine the feasibility of the combination in transmitting information from a remote sensor without a large energy source at that sensor. Analog modulation does not appear workable, but a digitally-encoded scheme is feasible.
Selection Considerations For A Servovalve, Frank J. Niemas Jr.
Selection Considerations For A Servovalve, Frank J. Niemas Jr.
Retrospective Theses and Dissertations
Servovalves are a key factor in determining the performance characteristics of an electrohydraulic position servo. This paper examines the interrelationships between servovalve parameters and system requirements. A brief description of the configuration and operation of a typical servovalve is presented. Key servovalve parameters are identified, defined, and discussed. System performance considerations are identified, and the interrelationships between system requirements and servovalve parameters are examined. Examples of servovalve parameters for missile, aircraft and industrial systems are given to illustrate the effect of system requirements on a servovalve. Finally, general guide-lines for selecting and specifying servovalve parameters are given.
A Model For Solid Waste Collection Costs, Bruce Anderson
A Model For Solid Waste Collection Costs, Bruce Anderson
Retrospective Theses and Dissertations
No abstract provided.
A Laser Hydrophone, Steven Kenneth Barnoske
A Laser Hydrophone, Steven Kenneth Barnoske
Retrospective Theses and Dissertations
This report proposes a novel technique for measuring of acoustic fields in water. A Laser Hydrophone is proposed taking advantage of the properties of Total Internal Reflection. A theoretical analysis of the idea is presented followed by a prediction of the operating characteristics of an actual system. Actual data were taken with the proposed system and it is compared to the predicted.
Infiltration In Stormwater Detention/ Percolation Basin Design, Robert David Beaver
Infiltration In Stormwater Detention/ Percolation Basin Design, Robert David Beaver
Retrospective Theses and Dissertations
Investigations of soil parameters, infiltration testing, and storm observations are used to determine the infiltration characteristics for three Central Florida stormwater holding basins. Basic soil parameters are investigated and a value for available soil water storage is computed from these data. In-situ permeability and infiltration tests are used to obtain field permeability and infiltration rates. Infiltration test results may be applied to infiltration theory. Data from infiltration tests may be verified using available soil water storage computed from soil parameters. The effect of soil cover conditions is noted and investigated using the drum infiltrometer. Storm observations are used to confirm …
Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog
Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog
Retrospective Theses and Dissertations
No abstract provided.
Using Ebers-Moll Equations To Evaluate The Nonlinear Distortion In Bipolar Transistor Amplifiers, Amanollah Khosrovi
Using Ebers-Moll Equations To Evaluate The Nonlinear Distortion In Bipolar Transistor Amplifiers, Amanollah Khosrovi
Retrospective Theses and Dissertations
The Ebers-Moll model, which is applicable to static or quasi-static conditions, is used as a basis for developing a simple method for the evaluation of harmonic distortion generated in bipolar transistor amplifiers. The Ebers-Moll equations are transformed into the desired forms using a Maclaurin Series expansion. A computer program is written to provide numerical results of the method, and these prediction are compared to measured distortion values.
Removal Of Hydrogen Sulfide From Ground Water In Central Florida, Thomas G. Lochrane
Removal Of Hydrogen Sulfide From Ground Water In Central Florida, Thomas G. Lochrane
Retrospective Theses and Dissertations
The presence of hydrogen sulfide in a ground water source is noted by its rather obnoxious odor, similar to a "rotten egg". Concentrations as low as 0.05 ppm are noticeable, therefore, almost its entire removal is demanded prior to potable consumption. Hydrogen sulfide is formed primarily by the decomposition of organic matter in anaerobic conditions. Removal of this gas has been accomplished by means of aeration, detention, and chlorination over the years. The mechanisms behind each of these processes are complex and discussed in this paper. During the course of this investigation, a literature survey concerning the mature and sources …
Aggregate Production Planning Techniques And Comparison, Fariborz Mazaheri
Aggregate Production Planning Techniques And Comparison, Fariborz Mazaheri
Retrospective Theses and Dissertations
Aggregate production planning models are of the greatest importance to operations management, since these plans enable management to utilize the major resources at its command. In this report the structure of the aggregate planning problem and a number of different approaches are reviewed and presented. Approaches are classified in three categories: a) workforce smoothing models, b) production smoothing models, c) production and workforce models. The models are compared with respect to the cost structure, parameters estimation, forecast requirement, decision variables, computability and optimization techniques.