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Articles 4321 - 4350 of 4566

Full-Text Articles in Engineering

A Passive Cooler For A Humid Climate, Steven Gilbert Ring Jan 1979

A Passive Cooler For A Humid Climate, Steven Gilbert Ring

Retrospective Theses and Dissertations

This paper examine a passive cooling system for a humid climate. This system will be divided into two parts, a radiative system and an evaporative system combined into a roof pond system. Performance of the radiative system will be enhanced through the use of a selective cover which will make use of an atmospheric window between 8 and 13um. An attempt will also be made to thermally isolate the radiative system from convective gains with the evaporative system. The evaporative system will consist of a water, solvent and dye layer over the selective cover of the radiative system. The performance …

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Molecular Size Distributions Of Heavy Metals In Lake Washington, William B. Andrews Jan 1979

Molecular Size Distributions Of Heavy Metals In Lake Washington, William B. Andrews

Retrospective Theses and Dissertations

Four untreated and one magnesium treated water samples from Lake Washington, the potable water source for the city of Melbourne, Florida, were collected and analyzed for As, Cd, Cr, Cu, Fe, Pb, Ni, Zn, Mb, Ca, and color on the basis of molecular weight distribution. Molecular weight distributions of the samples were obtained using a Millipore ultrafiltration system and filters in the following sizes: 106, 105, 2.5 x 104, 104, and 103 nominal molecular weight limits (nmwl). Color causing materials in the untreated samples were found to be located in the molecular weight fraction greater than 2.5 x 104 nmwl. …

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Study Of The Avalanche Multiplication And Signal-To-Noise Power Ratio In The Ternary InXGa1-XAs Avalanche Photodiode, Susan Lee Wymer Jan 1979

Study Of The Avalanche Multiplication And Signal-To-Noise Power Ratio In The Ternary InXGa1-XAs Avalanche Photodiode, Susan Lee Wymer

Retrospective Theses and Dissertations

Major advances in fiber optic transmissions have brought about a need for highly sensitive photodetectors. In order to detect this type of transmission, the photodetector must be able to detect one of the two low loss windows of the fiber optics transmission. The photodetector must also be characterized by a high gain and fast speed of response without generating excessive noise power. This report compares different types of high speed phodetectors with emphasis on the merits of using an avalanche photodiode. The report studies the avalanche multiplication and the signal-to-noise power ratio in the ternary InGaAs. The effects of the …

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Phosphorus Content And Release From Lake Sediments By Agitation, Hsien Ping Tang Oct 1978

Phosphorus Content And Release From Lake Sediments By Agitation, Hsien Ping Tang

Retrospective Theses and Dissertations

Man-made mixing in shallow lakes will resuspend bottom sediments and increase phosphorus concentration in the water body. The increase in phosphorus content may affect the lake productivity. During the course of this study, a better understanding of the water-sediment-phosphorus relationships of some shallow lakes in Central Florida was attempted. Column studies and batch experiments were used to investigate the effect of mechanical mixing on the release of phosphorus from bottom sediments collected from Lake Claire and Jessup. The particle size distribution and density distribution of the bottom sediments were studied and the release of phosphorus from each fraction was measured. …

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Speech Synthesis Utilizing Microcomputer Control, Joseph N. Uzel Oct 1978

Speech Synthesis Utilizing Microcomputer Control, Joseph N. Uzel

Retrospective Theses and Dissertations

This report explores the subject of speech synthesis. Information given includes a brief explanation of speech production in man, an historical view of speech synthesis, and four types of electronic synthesizers in use today. Also included is a brief presentation on phonetics, the study of speech sounds. An understanding of this subject is necessary to see how a synthesizer must produce certain sounds, and how these sounds are put together to create words. Finally a description of a limited text speech synthesizer is presented. This system allows the user to enter English text via a keyboard and have it output …

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The Design And Analysis Of A Unique Broadband Underwater Acoustic Source, Allan Mark Young Oct 1978

The Design And Analysis Of A Unique Broadband Underwater Acoustic Source, Allan Mark Young

Retrospective Theses and Dissertations

Requirements exist for a unique type of underwater acoustic source. The transducer is in the form of a linear array of discrete elements and is required to have a constants transmitting voltage response and carefully controlled directivity characteristics over a two octave bandwidth. A generalized model of a linear array of cylindrical piezoelectric ceramic acoustic radiators is developed and applied to the design of a prototype which operates over approximately one half of the required bandwidth. The prototype transducer was built and the measured results are compared with those predicted by the model. Recommendations are made for improving the performance …

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An Analysis Of The Effect Of Vibration Sensitivity On Hydrophone Design, George Dickson Hugus Oct 1978

An Analysis Of The Effect Of Vibration Sensitivity On Hydrophone Design, George Dickson Hugus

Retrospective Theses and Dissertations

Hydrophones used in the ocean produce spurious outputs due to vibration sensitivity which can severely degrade measurement accuracy. Sources of these vibration inputs are ocean surface waves, flow turbulence, and induced mechanical vibration. The hydrophone response to these vibrations is a noise voltage output. This can leave to a signal-to-noise problem particularly when measurements of small sound pressure levels are to be made. The objective of this thesis is to analyze the vibration response of three typical piezoelectric hydrophone sensor elements configurations and give design methods and constraints for reducing the problem of vibration sensitivity to an acceptable level. The …

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A Computer Model For Comparison Of Flat Plate And Focusing Collectors For Solar Air Conditioning, H. B. Bucher Jul 1978

A Computer Model For Comparison Of Flat Plate And Focusing Collectors For Solar Air Conditioning, H. B. Bucher

Retrospective Theses and Dissertations

Two types of solar collecting systems are frequently employed--flat plate collectors with spectrally selective windows which trap sunlight with the "greenhouse effect" and focusing systems with curved mirrors which concentrate the sun's rays on an absorbing surface. The flat plate collector is the simpler of the two designs, but cannot readily provide temperatures as high as the focusing collector. Both of the collectors are candidates for absorption cycle solar air conditioning systems. This role dictates higher temperature than are normally required of solar collectors, particularly the flat plate design. Focusing systems of interest here are those which are fixed in …

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An Investigation Into A Least Squares Method For Image Registration, Ernest William Cordon Jul 1978

An Investigation Into A Least Squares Method For Image Registration, Ernest William Cordon

Retrospective Theses and Dissertations

One of the problems associated with the automatic image processing of satellite photographs such as weather maps is the need for image registration; that is, the fitting of a map that has some translational and rotational bias to a known data base. This paper investigates a least square method of image registration using an image that has been converted into a boundary map with a pixel representation 1 for land, -1 for water and zero for cloud pixels. A sampled correlation array is constructed by shifting the weather map to locations on a given grid, centered around a sampled correlation …

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A Case Study Of A Solar Augmented Heating System Versus A Solar Assisted Heat Pump, Louis P. Braleski Jul 1978

A Case Study Of A Solar Augmented Heating System Versus A Solar Assisted Heat Pump, Louis P. Braleski

Retrospective Theses and Dissertations

The usage and applications of solar energy are numerous; however, it's still in its infancy. The subject matter discusses two applications of solar energy, a "Solar Augmented Heated System" and a "Solar Assisted Heat Pump." The solar augmented system and the solar assisted system have the same components; however, the way they are used is of primary concern. A solar system in parallel with a heat pump is called "Solar Augmented Heating System" or in series with a heat pump is a "Solar Assisted Heat Pump." A 2000 ft2 house was utilized as the basis of the design. The heating …

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Sensitivity Analysis Of Stormwater Runoff Using The "Bmp" And "Nonpt" Computer Programs, George D. Flatt Apr 1978

Sensitivity Analysis Of Stormwater Runoff Using The "Bmp" And "Nonpt" Computer Programs, George D. Flatt

Retrospective Theses and Dissertations

No abstract provided.

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Affinity Of Roadside Soils For Lead, Zinc, And Chromium, John H. Bell Apr 1978

Affinity Of Roadside Soils For Lead, Zinc, And Chromium, John H. Bell

Retrospective Theses and Dissertations

Highways are known to be a source of several toxic pollutants including the heavy metals lead, zinc and chromium. The need to manage highway runoff in a manner which reduces or eliminates the loading of heavy metals to receiving waters is evident, but more research has been required to develop cost-effective ways of meeting this need. Recent studies have indicated that the soil is a significant "sink" for heavy metals, allowing speculation that management practices which make use of the soil to retain metals from highway runoff should be employed. The purpose of this study is to evaluate the ability …

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Site Selection For Air Pollution Monitoring In The Vicinity Of Point Sources, John C. Brown Jan 1978

Site Selection For Air Pollution Monitoring In The Vicinity Of Point Sources, John C. Brown

Retrospective Theses and Dissertations

Ever since air pollution became a national concern in the 1950's, more and more emphasis has been placed on collection of representative air samples for many purposed, to include (1) evaluation of the degree to which national ambient air quality standards are being met and (2) to monitor maximum emission levels from point sources. Until recently efforts were directed toward qualitative methods of siting monitors for representative sampling. Since the dispersion of effluents is most complex, the quality of the data collected on the basis of judgment and, more or less, incremental siting about the source, has become suspect. Furthermore, …

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Digital Computer Analysis Of The Kinetic Response Of A Thermal Pressurized Water Reactor Power Plant, John F. Alburger Jan 1978

Digital Computer Analysis Of The Kinetic Response Of A Thermal Pressurized Water Reactor Power Plant, John F. Alburger

Retrospective Theses and Dissertations

A digital computer model has been developed to simulate the kinetic response of a thermal pressurized water reactor power plant. The program is capable of predicting core power and plant temperature variations which result from disturbances due to routine demand changes, control rod movement, and fission product poison transients as well as from transients during plausible accident situations. The development of the differential equations describing the influence of various primary plant components on the dynamics of the reactor have been heretofore documented in the literature. Finite difference equations facilitating the employment of a digital computer solution are fully derived. Confidence …

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A Simple Multicoupled Band-Pass Active Filter Design Employs Resistor Summing To Provide Multicoupling, Talal K. Chatila Jan 1978

A Simple Multicoupled Band-Pass Active Filter Design Employs Resistor Summing To Provide Multicoupling, Talal K. Chatila

Retrospective Theses and Dissertations

The purpose of this paper is to present a new design configuration for multicoupled band-pass filter based on Mason's loop rule, together with the negative feedback topology and to compare it with Leap Frog (LF) and Follow the Leader Feedback (FLF) design examples.

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Realization Of A Fast Automatic Correlation Algorithm For Registration Of Satellite Images, John E. Kassak Jan 1978

Realization Of A Fast Automatic Correlation Algorithm For Registration Of Satellite Images, John E. Kassak

Retrospective Theses and Dissertations

The requirement for a fast automated correlation algorithm for registration of satellite images is discussed. An overview of current registration techniques is presented indicating a correlator, matching binary maps compressed from the original imagery, may provide the required throughput when implemented with a dedicated hardware/processor. An actual registration problem utilizing GOES digitally processed imagery is chosen and defined. The realization of a fast correlator, matching image input data with sampled data base reference image data in real time is considered.

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The Design And Development Of A Power Hybrid, Robert J. Albert Jan 1978

The Design And Development Of A Power Hybrid, Robert J. Albert

Retrospective Theses and Dissertations

This report discusses the design, development and the fabrication of a power hybrid. Foldback current limiting which is self reseting is used whereby withstanding indefinitely a short circuit. Thermal design considerations and thermal analysis are described as well as stability analysis. The maximum current capability of this design is four amperes and forty watts can be dissipated in the power transistors over a wide range of temperatures.

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Design Curves For Groundwater Mounds Beneath Recharging Basins, Jack Weinstein Jan 1978

Design Curves For Groundwater Mounds Beneath Recharging Basins, Jack Weinstein

Retrospective Theses and Dissertations

Design curves are developed to simplify solution of the Hantush (1967) equation for groundwater mound build-up under a rectangular recharge basin. Curves are developed by analyzing a large number of solutions to the theoretical equation. Two sets of curves are developed, one for build-up beneath the center of the basin, the second for build-up anywhere in the field. Center-point curves are presented for 3 basins with length to width ratios of 2 to 1, and were easily developed. The more generalized curves are developed for the limited case of a 200 ft by 100 ft basin and are complicated by …

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Simulation Of Domestic Hot Water System Using Trnsys, Mohammed Shafi Uz Zaman Jan 1978

Simulation Of Domestic Hot Water System Using Trnsys, Mohammed Shafi Uz Zaman

Retrospective Theses and Dissertations

A Transient Simulation program (TRNSYS) was used to formulate the simulation of a domestic hot water system. Solar percent utilization and collector efficiency was observed for different set temperatures and hot water demand. The effect of hot water demand pattern on these parameters was likewise investigated. Regression analysis was used to forecast solar percent utilization with respect to set temperature and daily hot water demand.

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A Search For An Edge Image Algorithm For Application In An Automatic Registration System, Ronald J. Wojtasinski Jan 1978

A Search For An Edge Image Algorithm For Application In An Automatic Registration System, Ronald J. Wojtasinski

Retrospective Theses and Dissertations

No abstract provided.

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Investigations Of Inertia Effects On An Infinite Solid Cylinder Due To Thermal Shock, Roland Vanderbilt Williams Jan 1978

Investigations Of Inertia Effects On An Infinite Solid Cylinder Due To Thermal Shock, Roland Vanderbilt Williams

Retrospective Theses and Dissertations

In this paper the effects of inertia are explored for the case of a thermal excitation applied on the surface of an infinitely long, solid circular cylinder. The linear uncoupled field equations for a homogeneous, isotropic, thermoelastic medium are used to derive the desired field equations of stress and displacement. The solution procedure included, first, the determination of the thermal boundary value problem from the energy equation which is identically satisfied for the uncoupled condition. Secondly, substitution of the strain-displacement relationships and the previously obtained thermal relation into the equilibrium equation containing inertial effects. The equilibrium equation is the only …

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Power Inverters, Ezzatollah. Vahedi-Faridi Jan 1978

Power Inverters, Ezzatollah. Vahedi-Faridi

Retrospective Theses and Dissertations

This paper treats the theory and basic design of a DC-AC inverter. The output voltage, a periodic wave form, is derived from a low level DC source. The inverter's operation is described in detail for two different classes of switching device: SCR and transistor. A new design configuration which achieves higher efficiency than most commercial inverters on the market is discussed. Laboratory measurements for the design are tabulated in order to give an estimate of its performance.

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Analysis Of System Reliability As A Capital Investment, Albert J. Williams Jan 1978

Analysis Of System Reliability As A Capital Investment, Albert J. Williams

Retrospective Theses and Dissertations

This report, "Analysis of System Reliability as a Capital Investment", is an analysis of radar system reliability of two similar tracking radar systems as a capital investment. It describes the two tracking radar systems and calculates the mission failures rates based upon field failure data. Additionally, an analysis of a simulation program written in FORTRAN is performed which treats system reliability as a capital investment based on 335 electronic systems that were fabricated with a reliability program versus 564 electronic systems fabricated without a reliability program. The data from the two tracking radar systems, one with reliability program and the …

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Analysis Of Switching Regulator Power Supply, Chang Il Lee Jan 1977

Analysis Of Switching Regulator Power Supply, Chang Il Lee

Retrospective Theses and Dissertations

No abstract provided.

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A Model For Solid Waste Collection Costs, Bruce Anderson Jan 1977

A Model For Solid Waste Collection Costs, Bruce Anderson

Retrospective Theses and Dissertations

No abstract provided.

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A Hypothetical Model For System Safety In Air Transportation, Herbert Matthew Bowden Jan 1977

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.

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Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog Jan 1977

Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog

Retrospective Theses and Dissertations

No abstract provided.

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Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner Jan 1977

Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner

Retrospective Theses and Dissertations

No abstract provided.

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Distributed Computing Systems: An Overview, Haim Schwarzkopf Jan 1977

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 …

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Computer Simulation Of 911 Emergency Telephone System For Orange County, Florida, Ronald J. Veillette Jan 1977

Computer Simulation Of 911 Emergency Telephone System For Orange County, Florida, Ronald J. Veillette

Retrospective Theses and Dissertations

The State of Florida has mandated that a statewide 911 system be implemented, and the Department of General Services, Division of Communications, has performed a study of possible 911 system configurations for Orange County based on the findings of a study performed by the Stanford Research Institute for the whole of the State of Florida. The Orange County study determined operator manning levels of the primary law enforcement agencies involved in the system and response times to citizen calls for each of the configurations proposed. This research generated computer simulation models of the two most likely to be implemented configurations …

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