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Articles 1 - 30 of 39
Full-Text Articles in Engineering
The Effect Of Random Number Generators On Applications, Edwin G. Landauer
The Effect Of Random Number Generators On Applications, Edwin G. Landauer
Retrospective Theses and Dissertations
Several pseudorandom number generators are described and compared on the basis of cost of generation and length of period of the sequences that are produced. The major statistical tests, which are used to obtain a measure of randomness for the different generators are discussed and compared. Four pseudorandom number generators are programmed in GPSS and are used to generate interarrival and service times for an M/M/1 queuing system. The results of each of the trials are compared to the theoretical results which can be obtained from queuing theory.
The Effects Of Plain Sedimentation On The Quality Of Urban Stormwater Runoff From The Lake Eola Watershed, Victor Julius Godlewski
The Effects Of Plain Sedimentation On The Quality Of Urban Stormwater Runoff From The Lake Eola Watershed, Victor Julius Godlewski
Retrospective Theses and Dissertations
The settling characteristics of urban stormwater runoff emanating from the Lake Eola Watershed (Orlando, Florida) were evaluated through a series of 7 column studies. The percentage removal that occurred due to sedimentation was observed for various stormwater pollutants and constituents. These included the General Water Quality Parameters: Total Suspended Solids, Non-volatile Suspended Solids, Volatile Suspended Solids, Chemical Oxygen Demand, Total Kjeldahl Nitrogen, Ammonia Nitrogen, Total Organic Carbon, and Total Phosphorus. The metals parameters: Zinc, Cadmium, Arsenic, Nickel, Copper, Magnesium, Iron, Lead, Chromium and Calcium were also considered. The results of the settling analysis indicates that the quality of Lake Eola …
Adjustable Low Frequency Servo Compensation Using Operational Amplifiers, Charles P. Partin
Adjustable Low Frequency Servo Compensation Using Operational Amplifiers, Charles P. Partin
Retrospective Theses and Dissertations
This paper defines a variable transfer function that is used to compensate for low frequency structural resonances in a turret so that stabilization of a closed loop servo system can be achieved. Three circuits for implementing this compensation are presented. They are: the feedforward three amplifier biquad, the summing four amplifier biquad, and the single amplifier biquad with pole-zero cancellation. Design equations allowing the engineer to go directly from the given transfer function to the actual component values are developed for each circuit. A comparison of the final circuit designs is also presented.
A Cross Assembler For The M6800 Microprocessor, Donald J. Walsh
A Cross Assembler For The M6800 Microprocessor, Donald J. Walsh
Retrospective Theses and Dissertations
This research paper describes a cross assembler for the Motorola 6800 assembly language which was written in Fortran to run on the Digital Equipment Corporation PDP 11/34. The assembler provides an assembly listing on the CRT or Printer and an Object File. In addition, the assembler will check for errors during PASS 1 and also during PASS 2.
Project Scheduling Under Constrained Resources, Mohammed Benameur
Project Scheduling Under Constrained Resources, Mohammed Benameur
Retrospective Theses and Dissertations
This report examines the widely acceptable Heuristic and Exact procedures for solving the problem of project scheduling and control under constrained resources. Heuristic approaches are more practical, however they depend on the type of the project as well as the resources involved. Exact procedures are illustrated using an Integer Linear Programming formulation of the problem, and also solving it using the Branch and Bound Technique. Impracticality of the exact methods stews from the fact that the computations expand to an unmanageable amount.
Smada: Stormwater Management And Design Aid, Timothy M. Curran
Smada: Stormwater Management And Design Aid, Timothy M. Curran
Retrospective Theses and Dissertations
The Stormwater Management and Design Aid (SMADA) is a computer model formulated to assess stormwater runoff quantity and quality. Applicable theory is reviewed to introduce a discussion of the modeling methodology. A pre- vs. post-development design objective can be incorporated to evaluate runoff quantity and quality for single or multiple land use watershed. Detention and retention facilities are considered and conveyance systems for runoff transmission can be sized. Initial design assessments and consistent design review and evaluation are possible. SMADA is written in the BASIC language and is executed in the interactive mode. No computer cards are required and data …
An Investigation Of Fabric Filtration For The Removal Of Colloidal Turbidity From A Laboratory Water, David Brent Jansen
An Investigation Of Fabric Filtration For The Removal Of Colloidal Turbidity From A Laboratory Water, David Brent Jansen
Retrospective Theses and Dissertations
A kaolin in tapwater suspension was treated either with alum or one of two cationic polymers. The resulting suspension was filtered through various configurations of felt cloth filters. The kaolin suspension was adjusted to 100 JTU. Treatment by polymer consistently lowered the filtered effluent to less than 1 JTU. Jar tests were utilized to determine optimum coagulant dose for the tests. The formulation of a complete filter cake in the filter appeared to be the determining factor in the efficiency of water clarification by the filter. The literature lacked references to this concept as applied to water supply problems. The …
A Real Time Microprocessor Based Digital Filter Implementation, Mark H. Shaver
A Real Time Microprocessor Based Digital Filter Implementation, Mark H. Shaver
Retrospective Theses and Dissertations
A major break-through in the real-time digital simulation of dynamic models has occurred with the introduction of the Intel 2920 digital signal processing chip. The problems and potentials for this new device are demonstrated by implementing an elliptic function digital low pass filter via the bilinear z-transform approach. The software implementation is presented. Debugging and software verification are accomplished via manufacturer's simulation software tools. The hardware performance is verified in the laboratory. The results of these efforts point to much promise for wide scale applications, however, problems associated with performance indicate early version chip problems.
Chemical Treatment Of Urban Stormwater Runoff By Settling Column Studies, Paul R. Moore
Chemical Treatment Of Urban Stormwater Runoff By Settling Column Studies, Paul R. Moore
Retrospective Theses and Dissertations
Lake Eola, in downtown Orlando, was the subject of extensive research to determine the impact of stormwater runoff to the lake and possible management alternatives. The focus of this research was stormwater treatment by chemical coagulation followed by detention. Phosphorus was the main parameter targeted for removal. Various chemical parameters were also evaluated included: TSS, VSS, NVSS, COD, TKN, NH3, TOC, TP, Ca, As, Cd, Cu, Cr, Ni, Mg, Zn, Fe, and Pb. The chemical coagulants used for this research included: alum, ferric chloride, and lime. The study involved settling column tests for the various treatment methods to determine stormwater …
Implementation And Documentation Of Oracls (Optimal Regulator Algorithm For The Control Of Linear Systems) Software Package, Bahram Parvizi
Implementation And Documentation Of Oracls (Optimal Regulator Algorithm For The Control Of Linear Systems) Software Package, Bahram Parvizi
Retrospective Theses and Dissertations
The objective of this research is to mount a software package entitled Optimal Regulator Algorithms for the Control of Linear Systems (ORACLS), on a Control Data Corporation (CDC) Cyber 74 digital computer system at Florida State University so that is can be operated from the University of Central Florida. The software package contains 60 subroutines which can be used for the analysis and design of state variable feedback control alws for time-invariant linear systems. The procedure for using this package is documented. Several examples are presented to illustrate the capability ORACLS in both digital and continuous linear-quadratic-gaussian (LQG) controller design …
Plant Layout Technique Analysis For The U.S. Postal Service General Mail Facility, Howard Stillwell
Plant Layout Technique Analysis For The U.S. Postal Service General Mail Facility, Howard Stillwell
Retrospective Theses and Dissertations
The layout of the U.S. Postal Service General Mail Facility (GMF) workroom operation is an essential factor to the overall productivity of the mail processing activities. An efficient workroom layout will minimize the cost of transporting containerized mail between the various distribution operations. Any changes in distribution methods, increases or decreases in mail volumes, or the addition of mechanization must be analyzed by the GMF industrial engineer to determine what effect these changes have on the existing workroom layout. He must also be able to evaluate layout changes recommended by management and floor supervisors. The present methods available to the …
Optical Phase Modulation Utilizing Magnetoelastic Properties Of Metallic Glasses, Frank R. Trowbridge
Optical Phase Modulation Utilizing Magnetoelastic Properties Of Metallic Glasses, Frank R. Trowbridge
Retrospective Theses and Dissertations
Three different optical fiber phase modulators utilizing the magnetostrictive properties of the metallic glass alloy Fe74Co10B16 were constructed. By binding the optical fiber to the magnetostrictive metallic glass, the strain imparted to the metallic glass from the magnetic field is transferred to the optical fiber. The strain on the optical fiber shifts the phase of the light, which can be controlled indirectly by varying the current producing the magnetic field permeating the metallic glass. The performance of the modulators on the basis of optical phase shift as a function of bias magnetic field and optical phase shift as a function …
City Of Kissimmee Solid Waste Collection System, Larry W. Walter
City Of Kissimmee Solid Waste Collection System, Larry W. Walter
Retrospective Theses and Dissertations
Every year the average American throws out more and more garbage. In the next five years, it is projected to increase 20-25 percent. This garbage, termed solid waste, is stored, collected, hauled and disposed of in some manner. The objective of this report has been to evaluate the City of Kissimmee's one-man residential solid waste collection system. The study results indicated this generation rate of the City to be 3.28 pounds per person per day, or 29.1 pounds per home per pickup. The productivity equations developed from the City data did not compare well with the results of EPA. Also …
Multiprocessor/Multicomputer Systems And Optimal Loading Techniques, Francis D. Adams
Multiprocessor/Multicomputer Systems And Optimal Loading Techniques, Francis D. Adams
Retrospective Theses and Dissertations
This report reviews the subject of multiprocessor/multicomputer systems and optimal loading techniques. This report covers: 1. The interrelationship of Multiprocessor/Multicomputer (Multiple Instruction Stream Multiple Data Stream, MIMD) systems and other architectures by presenting a categorization of computer architectures. 2. Comparison of Multiprocessor/Multicomputer (MIMD), versus Parallel Processor (Single Instruction stream Multiple Data stream, SIMD) systems. 3. Multiprocessor/Multicomputer problems, pitfalls and new goals. 4. Investigation of loading techniques by reviewing particular MIMD executive designs.
Filtration Of Detained Stormwater Through Sand And Alum Sludge For Water Quality Control, Claude L. Cassagnol
Filtration Of Detained Stormwater Through Sand And Alum Sludge For Water Quality Control, Claude L. Cassagnol
Retrospective Theses and Dissertations
Stormwater detention systems as they are frequently designed do not provide good water quality control of stormwater runoff. A filtration media to be used in conjunction with detention ponds to improve their pollutant removal efficiencies was tested at the University of Central Florida and found to be effective. The filtration media, which consisted of a mixture of sand and alum sludge, substantially improved effluent water quality. Average reductions of over 80 % were observed in concentrations of dissolved orthophosphorus, total orthophosphorus and total phosphorus. Reductions were also experienced in iron, aluminum, copper and zinc concentrations. A prototype filtration model is …
Small Scale Hydropower-Appropriate Technology For Rural Development In Lesser Developed Countries, Stephen R. Harper
Small Scale Hydropower-Appropriate Technology For Rural Development In Lesser Developed Countries, Stephen R. Harper
Retrospective Theses and Dissertations
Less Developed Countries (LDC's) now have a total of about 2.8 billion people, or approximately 70 percent of the total world population. World populations and current energy consumption are such that is all the world's countries came up to the U.S. per capita energy use, the world's consumption would multiply by a factor of seven. For the LDC's, energy development will be an increasingly important issue. Hydropower technology is on the shelf, and available now, of proven feasibility both technically and economically, and presents a sound and rational energy solution from the environmental viewpoint. It is a technology which could …
Evaluation Of Various Mass Transportation Alternatives For The University Of Central Florida Commuters, Jamal Niroumand-Rahimi
Evaluation Of Various Mass Transportation Alternatives For The University Of Central Florida Commuters, Jamal Niroumand-Rahimi
Retrospective Theses and Dissertations
This research evaluated various mass transportation alternatives for the commuting students, faculty and staff of the University of Central Florida (U.C.F.), located at Orlando. The alternatives considered in this research are bus service, van service / minibus service, vanpool, carpool, and bicycle and pedestrian modes. During the life-time of the University the private automobile has been the only prevalent mode of transportation used by the U.C.F. commuters. Opinion surveys conducted in the summer of 1979 indicated that the U.C.F. commuters are confronted with a number of transportation problems including lack of parking spaces on campus, traffic congestion on the access …
Impact Of Highway Bridge Runoff On Adjacent Receiving Water Bodies, James E. Christopher
Impact Of Highway Bridge Runoff On Adjacent Receiving Water Bodies, James E. Christopher
Retrospective Theses and Dissertations
Two locations, Lake Ivanhoe and the Maitland interchange of Interstate 4, were selected to study the impact of bridge runoff on receiving water bodies. The Lake Ivanhoe location includes two similar bridges, one without scuppers and one with scuppers. The Maitland interchange site has several borr ponds which drain to Lake Lucien. Samples were collected from Lake Ivanhoe below the bridges and in the open lake away from the bridges. Also samples were collected from the east pond, west pond, and lake Lucien, at the Maitland interchange. Samples included water, sediments, plants and benthos to detect differences, if any, in …
Sewer System Evaluation Surveys Conducted In Industrial Plants, Robert B. Cadle
Sewer System Evaluation Surveys Conducted In Industrial Plants, Robert B. Cadle
Retrospective Theses and Dissertations
"Sewer System Evaluation Surveys Conducted in Industrial Sewers," describes the methods employed and the results of Sewer System Evaluation Survey studies conducted at two industrial complexes. The procedural techniques for locating and quantifying infiltration and inflow into sewer systems represented to provide a basic understanding of the steps required to complete such studies. Case studies of actual surveys conducted at two privately operated industrial plants in Tennessee are presented to illustrate the utilization of the investigative techniques. The results of the studies are compared with each other and with similar studies conducted in municipal sewer systems.
Risk Analysis - An Economic Comparison Of Oil And Coal Power Plants, Mohammad M. Iranmanesh
Risk Analysis - An Economic Comparison Of Oil And Coal Power Plants, Mohammad M. Iranmanesh
Retrospective Theses and Dissertations
The demand for electric energy increases every year. However, due to recent changes in the U.S. energy supplies, a growing gas shortage forced suppliers to curtail deliveries of natural gas for power generation. Many utilities anticipating supply problems switched to burning more costly light distillate oil. Unfortunately the Arab boycott of 1973 and the following price increases for oil forced again utilities to seek a cheaper source of fuel, namely coal, as a substitute for oil. Even though the U.S. has abundant supply in coal, the use of coal in power generation was limited in the past because of a …
A Parametric Study Of Economical Energy Usage In Freeze Tunnels, Marc A. Harrison
A Parametric Study Of Economical Energy Usage In Freeze Tunnels, Marc A. Harrison
Retrospective Theses and Dissertations
An investigation into economical energy usage in freeze tunnels was conducted. Freeze tunnels are commonly used in the food processing industry to freeze products, and in some cases may use large amounts of electricity. An actual freeze tunnel was observed and modeled on a computer. A parameter study was conducted. The results of the parameter study indicated the efficiency and energy costs in freeze tunnels may vary widely. Important parameters included the Nusselt number, air temperature, and the ratio of fan work divided by the useful refrigeration effect. Although no single set of optimum conditions were found, methods for improving …
A Computer Simulation Of The Operations Of A Spent Nuclear Fuel Receiving And Storage Station, Jeanna Lorene Barnard
A Computer Simulation Of The Operations Of A Spent Nuclear Fuel Receiving And Storage Station, Jeanna Lorene Barnard
Retrospective Theses and Dissertations
Spent nuclear fuel is received at a storage facility in heavily shielded casks transported by either rail or by truck. Once at the storage facility, the casks are inspected, emptied, decontaminated, and reshipped. Allied-General Nuclear Services' (AGNS) nuclear fuel reprocessing plant in Barnwell, South Carolina, is constructed but not yet licensed for spent nuclear fuel storage or reprocessing. Recently, however, AGNS was granted funds by the Department of Energy to prepare the necessary procedural and regulatory paperwork in order that the Fuel Receiving and Storage Station (FRSS) of the plant can be licensed by 1985. In this paper, the activities …
Bilin: A Bilinear Transformation Computer Program And Its Applications, John Dana Greer
Bilin: A Bilinear Transformation Computer Program And Its Applications, John Dana Greer
Retrospective Theses and Dissertations
Given a transfer function for a differential equation model, an approach for obtaining a solution is by way of bilinear transformation. The bilinear transform approach is a numerical integration scheme which gives a discrete approximation to the differential equation solution. BILIN applies a series of polynomial transformations to the transfer function H(s). As a result, H(s) is mapped into the complex z plane obtaining the discrete transfer function H(z). From H(z), the difference equation is obtained whose solution y(nT) approximates the actual differential solution y(t). Hence, BILIN provides a means for obtaining discrete transfer functions for the design of digital …
The Effects Of Introducing Skewness Into Capital Rationing Decision Models, Edet Jonathan Ekere
The Effects Of Introducing Skewness Into Capital Rationing Decision Models, Edet Jonathan Ekere
Retrospective Theses and Dissertations
When investment projects are described by subjective probability distributions, the measure of investment worth becomes a difficult task. One of the basic assumptions underlying investment analysis under risk is that decision makers would base their decisions on only the first two statistical moments of the probability distribution of returns. However, the mean and variance can adequately describe only certain symmetric distributions such as the normal and the uniform distributions. As a result, if probability distributions of investment returns are actually asymmetric, the classic first two moments analysis ignores information (skewness) that is needed to make a better investment decision. Even …
Statistical Fading Of A Spherical Optical Wave In Atmospheric Turbulence, Lorraine M. Locke
Statistical Fading Of A Spherical Optical Wave In Atmospheric Turbulence, Lorraine M. Locke
Retrospective Theses and Dissertations
A formula for the average fade time of the intensity of a spherical optical wave travelling through atmospheric turbulence is developed. The model employed involves isotropic, homogeneous statistics using a lognormal distribution for the channel. The analysis is based on the fact that the logarithm of the irradiance is normally distributed and uses the work of S. O. Rice who developed such an expression for a zero mean, Gaussian process. The analysis employs the covariance function and the Taylor frozen turbulence hypothesis which results in an expression for the autocorrelation function.
Analysis Of Traffic Accidents At Daytona Beach In Volusia County, State Of Florida, Mohammad Reza Hajian
Analysis Of Traffic Accidents At Daytona Beach In Volusia County, State Of Florida, Mohammad Reza Hajian
Retrospective Theses and Dissertations
Anyone who has been tempted to cross a beach or walk along a beach is aware of the potential conflicts that can arise between pedestrians and vehicles. The competing use of the beach space results in conflicts between vehicles and pedestrians; many times the pedestrian's disregard for signed pedestrian safety provisions in the close vicinity and on the space allocated for car lanes results in avoidable conflicts. This report addresses the pedestrian and vehicle interaction at Daytona Beach in Volusia County of the State of Florida. This report has consolidated accident data for the period January 1, 1977 through July …
Optimum Monotonic Step Response Filters, Peter H. Halpern
Optimum Monotonic Step Response Filters, Peter H. Halpern
Retrospective Theses and Dissertations
The problem of designing sharp cutoff filters with monotonic step responses is addressed. The impulse responses of the filters are expanded in terms of finite duration trigonometric polynomials. The coefficients of the trigonometric polynomials are obtained, for arbitrary frequency penalty functions, by solving a generalized eigenvalue problem. Once the trigonometric polynomial is specified the network can be synthesized with known techniques. Two theorems which assist in the numerical solution are proven.
Electromagnetic Wave Scattering From A Rough Surface, Elie G. Nacouzi
Electromagnetic Wave Scattering From A Rough Surface, Elie G. Nacouzi
Retrospective Theses and Dissertations
This was a study to measure surface roughness using scattering of electromagnetic waves in the Ka and X microwave frequency bands. The detected fluctuations of the reflected field intensity is a measure of surface roughness. The reflected field intensity depends on the wavelength, the angle of incidence and the electrical properties of the media. Since the surface presents irregularities with randomly distributed facets, the characteristics of the rough-surface reflected wave can only be described by the statistical properties of the field intensity. The dependence of the normalized moments of the returned scatter on distance from the rough surface to the …
Speed Control Of Dc Shunt Motor For Electric Car Use, Mahmood Shahi
Speed Control Of Dc Shunt Motor For Electric Car Use, Mahmood Shahi
Retrospective Theses and Dissertations
This report describes the speed characteristic and various methods of speed control of DC shunt (separately excited) motors, especially for application in electrical vehicles. The basic behavior of the DC motor is discussed, along with traditional and modern techniques of speed control. As an example, a speed controller for a shunt motor (built and tested by the author) is discussed. Two types of speed controllers for electric cars are discussed, and the performance results for an experimental electric car are presented. Finally, a design for a 24 HP car motor controller using both armature and field control was simulated on …
Noise Description And Noise Control At The Federal, State, And Local Level, Bobby L. Henning
Noise Description And Noise Control At The Federal, State, And Local Level, Bobby L. Henning
Retrospective Theses and Dissertations
Noise, that undesirable portion of the ever-present sounds of our environment, has until the last decade, been considered as an unavoidable by-product of our rapid population growth and its accompanying mechanization. As awareness of adverse health effects from noise exposure grew, the Federal government, as protector of the public health and welfare, took the initial steps to control noise pollution. Federal legislation, beginning with the Clean Air Amendments of 1970, has been promulgated to control major offenders and to assist State and local governments in their endeavors to provide the public with an environment free from harmful noise levels. This …