Engineering Commons^™

Intermodulation Analysis Of Class C Transistorized Amplifiers With Applications To V.H.F. Amplifiers, Robert Hopkins Wollam

Retrospective Theses and Dissertations

The paper discusses the theoretical analysis and the experimental work done to describe the cause of intermodulation distortion in class C transistorized amplifiers. A mathematical basis for the intermodulation was derived using a single frequency input and a second frequency introduced into the output of the amplifier. It was followed by experimental work performed to justify the theory. These experiments used both pulsed and sinusoidal drives as amplifier inputs. Also, a feedback method along with the transistor's operating point was shown to reduce the intermodulation distortion produced by the amplifier. Finally, a short discussion on the results and some of …

A Proximity Vehicle Locator System, Bradley Everett Thompson

Retrospective Theses and Dissertations

The purpose of this paper is to discuss the design, construction and operation of the proximity vehicle locator system prototype developed for the Orlando Police Department. The objective of the project itself was to provide the O.P.D. with a simple but effective system by which constant surveillance of patrol car locations could be maintained, thus improving the department's operational efficiency. Each unit designed specifically for use in this project will be discussed in some detail, while those purchased locally for use in the project will be only briefly described, as pertaining to their functional importance to the system. In addition, …

Design Considerations For Extended Aeration-Denitrification Facilities, Frank Paul Huttner

Retrospective Theses and Dissertations

Design considerations and operating procedures were investigated for nitrogen removal in an extended aeration-denitrification facility. Both past and present removal efficiencies were evaluated for the facility, along with capital and operating cost data. The findings of this research indicate that at very long detention times, significant nitrification and denitrification occurred in the plant without the use of chemicals. Overall nitrogen, BOD5, and suspended solids removals were extremely high. The significance of this research is that future plants may achieve high rates of nitrogen removal through innovative design and operating procedures without the use of costly chemicals. However, capital costs needed …

Design Of The Ultralight Two Place Gyroplane, Martin. Hollmann

Retrospective Theses and Dissertations

No abstract provided.

Development Of A Remote Sound Monitoring System, Joseph Owen Ellis

Retrospective Theses and Dissertations

This report explains the development of a sound measuring system for continuous monitoring of sound levels. Dedicated telephone lines are used for data transmission so that sound level data can be monitored at installations far from the area of concern. This allows the sound sensing equipment to be left unattended and thereby greatly reduces the manpower costs of operation. That predetermined data conditions can be detected when they occur and corrective action can be taken immediately at the data receiving installation further justifies the method used. Background information and general need for such a system are discussed. Growing public concern …

Aging Characteristics Of Aluminum-Silver Alloys, Paul Leray Reynolds

Retrospective Theses and Dissertations

The effect of single-step and two-step aging treatments on the tensile properties of an Al-6 wt. % Ag alloy and an Al-14 wt. % Ag alloy has been investigated. Results show that the tensile properties of these alloys were approximately the same whether they were given single or two-step aging treatments. Reversion treatments applied to the fully age-hardened Al-14 % Ag alloy after 15 minutes at various temperatures between 200 and 350 °C showed two maxima in the ultimate tensile strength and the yield strength. It is believed that this result was caused by two transformation processes occurring simultaneously: i.e., …

Application Of Computer War Gaming In The Evaluation Of Missile Performance Requirements For Air To Air Engagements, Joy F. Berman

Retrospective Theses and Dissertations

No abstract provided.

Image Analysis And Improvement Of A Point Light Source Visual Flight Simulator, Steve K. Butrimas

Retrospective Theses and Dissertations

It has long been desired to simulate a non-preprogrammed controllable visual scene of the real world in a limited area for the purpose of training, in particular for aviation training. There presently exists a point light source projection system designed to accomplish this, however due to physical limitations, the display image, as compared to the corresponding real world scene which is being simulated, is somewhat distorted and limited. This point light source system is analyzed to determine the distortions and deviations from reality and methods are proposed to improve the display by minimizing the distortions and deviations.

An Analysis Of The Feasibility Of An Automatic Vehicle Locator System For The Orlando Police Department, Larry L. Lester

Retrospective Theses and Dissertations

No abstract provided.

Steady State Oscillations In Switching Regulated Dc To Dc Power Supplies, Jayant Gajanan Vaidya

Retrospective Theses and Dissertations

No abstract provided.

The Effect Of Contact Angle, Surface Roughness, And Adsorption Of Heterogeneous Nucleation Of Condensing Water, Prafulla Chandra Mahata

Doctoral Dissertations

"Condensation of water vapor on various surfaces was studied experimentally. It was found that supersaturations as high as 25% were required to initiate condensation on hydrophobic surfaces. The supersaturation data agreed qualitatively with the Volmer theory of heterogeneous nucleation. The influence of adsorption of water vapor was found to be small. Surface roughness caused a little reduction in the critical supersaturation"--Abstract, page iii.

Process Optimization By Flow Sheet Simulation, Larry Dale Gaines

Doctoral Dissertations

"PROPS, (Process Optimization System), has been used to simulate and optimize the Universal Oil Products solid phosphoric acid catalyst process for producing gasoline. PROPS, a modified version of CHESS (Chemical Engineering Simulation System), performs a complete design and economic evaluation of the process for each set of independent variables. The computational time during optimization was reduced by the use of a regression equation to determine K-values as a function of temperature and pressure. K-value data used for the regression was generated from the Chao-Seader correlation using mixtures of the gasoline components to be encountered during optimization. The regression equation produces …

Measurements Of Condensation Coefficient Exhibited By Water Drops Grown On Rural Cloud Nuclei, Abbas M. Sinnarwalla

Doctoral Dissertations

"Values of condensation coefficient, ß, were experimentally determined for water drops grown on cloud nuclei in atmospheric air samples. The measured quantities were supersaturation, final drop size (6 to 7.5 µm radius), and time to grow from near dry radius to final radius. The drops were grown in a vertical-flow thermal diffusion chamber, at supersaturations near 0.5 and 1.0%. The final drop sizes were large enough so that ß did not depend upon the size of the nucleus producing a given drop. The average value of ß was 0.025 with a standard deviation of about 0.01"--Abstract, page 2.

Rc-Gyrator Ladder And Rlc Symmetrical Lattice Network Synthesis - A State-Space Approach, Tien Hua

Doctoral Dissertations

"This dissertation presents two network realization procedures using the state-space approach. The first procedure is the realization of a transfer function. A state model (A,B,C,D) is obtained from the given transfer function by inspection, where A is a companion matrix. Through a similarity transformation T, another state model (F,G,H,J) is obtained, where F is a tridiagonal matrix and can be realized by a RC-gyrator ladder network. The input source is inserted in the proper position of the ladder network, and the output is obtained through a summing circuit. It is a unified procedure and uses simple algebraic computation. A general …

Anionic Polymerization Of A Series Of Cyclocarbosiloxanes, William W. Knickmeyer

Doctoral Dissertations

"A study has been made on the anionic polymerization of a series of cyclocarbosiloxanes of the type: [IMAGE] where n was varied from 2 to 8. The polymerization reaction in benzene, was initiated using cesium trihexyl silanolate, a unique organic soluble liquid catalysts. Benzene served as both a solvent and to shift the position of the NMR SiCH₃ polymer peak away from the monomer peak making it feasible to follow the kinetics on a Varian EM-360 Nuclear Magnetic Resonance Spectrometer. Hexamethylphosphoramide (HMPA) was used as a promoter to solvate the initiator ions and thus increasing the polymerization rate. It …

The Morphology Of Cellular Precipitation In Magnesium Rich Magnesium-Aluminum Alloys, Jyong Shi Cho

Doctoral Dissertations

"The morphology of cellular precipitation in a Mg-9wt. %AI alloy has been investigated by light and electron microscopy. A study of the early stages of the cellular precipitation process indicated that cellular precipitate structure forms in Mg-Al alloys by Fournelle and Clark mechanism. "Replacive" motion indicative of the Tu and Turnbull mechanism for cellular precipitation was not seen"--Abstract, page 1.

Growth Of Single Crystals By The Flux Technique, Nabil H Kerba

Archived Theses and Dissertations

No abstract provided.

Structural Behavior Of Cold-Formed Steel Members Made Of Thick Sheets And Plates, Ai-Shen Liu

Doctoral Dissertations

"It is well-known that the current AlSI Specification for the design of cold-formed steel structural members has been developed mainly for thin steel sections. In order to extend the applicability of the specification for the design of cold-formed steel members thicker than 1/4 in., both analytical and experimental investigations have recently been conducted with special emphases on the effects of cold work on the mechanical properties of corners and the strength of bolted connections.

For the effects of cold work, previous investigations have shown that the phenomena of strain hardening and strain aging are main factors which affect the mechanical …

On Finding A Minimal Multiple Fault Test Set In Combinational Networks., Dang Quang Tam

Masters Theses

"A simple and systematic approach which generates exactly a minimal multiple fault test set T mm in irredundant combinational networks is presented. It is shown that the Equivalent Sum of Product of a given network contains all the information necessary to determine this minimal test set. The failures which may occur are limited to permanent stuck at O (or 1) faults"-- Abstract, p. ii

The Control Of Noise In Urban Areas., Edwin Eugene Frye Jr.

Masters Theses

"Noise has recently been labeled the 'fourth pollutant' and defined by some as the 'unwanted sound' that pervades our work environments and the privacy of our homes. This concern for noise and its effects has resulted from our nation's increasing population density, the increasing use of mechanized conveniences, the influx and growing use of mass transportation systems, and the public's awareness that noise not only 'annoys' and can increase everyday tensions and anxieties, but at certain levels can cause permanent hearing loss.

In order to curb the 'noise problem' legislators and municipal representatives began applying legal controls to noisy activities …

Regional Geological Engineering Mapping By Erts-1 Imagery A Case Study On Taiwan., Shih-Tsu Chen

Masters Theses

"Three types of maps of Taiwan were made by using color composites of ERTS-1 images. The three types of maps, consisting of a regional land use map, an offshore sediment distribution map, and a tectonic map, were made from a color composite imagery utilizing Diazo chrome and Esco chrome films with a planimetrically accuracy sufficient for a 1:1,000,000 scale map.

Color enhanced imagery was found to increase the accuracy level of the land use interpretation. Three color enhancement techniques were used to increase the color contrast between the scenes of different land use. Particular land use scenes required a special …

Esca Characterization Of Flotation Products From A Lead-Zinc-Copper Concentrator On The New Lead Belt Of Southeast Missouri., Kevin Leroy Purdy

Masters Theses

"Electron spectroscopy for chemical analysis (ESCA) was used to determine the surface characteristics of products from an operating Pb-Zn-Cu concentrator on the New Lead Belt of southeast Missouri and pure galena and sphalerite samples treated with flotation reagents in concentrations similar to those used in the mills. The emphasis was on the action of surface modifiers such as Na₂Cr₂O7, starch, SO₂, CuSO₄ and NaCN in sphalerite flotation and in the galena-chalcopyrite separation. The objective of the investigation was to monitor the relative oxidation states of the mineral and reagent constituents and correlate these …

Design Of A Medium Pressure Hydraulic Coal Mining Machine Power Unit System., William Rudolph Heincker

Masters Theses

"In this thesis the design of the major components of a medium pressure hydraulic coal mining machine is presented. The machine is to produce water jets operating at a continuous pressure of 10,000 psi with a total flow rate of 47.8 gpm. This machine is being used to mine coal from an underground longwall coal face, with an expected output of 7 tons per minute.

The primary elements of the hydraulic coal mining machine are the power source, the pump, the cutting head, and the secondary plow supporting structures. The power source will be a British Jefferey-Diamond (BJD) Supermatic electric …

An Analysis Of The (N-1,N) Pad ̌Approximant To The Ideal Delay Operator In Terms Of Bessell Functions., Carl Richard Erdmann

Masters Theses

"A realizable, lowpass, non-minimum phase approximation to the ideal distortion less delay operator e^-st₀ is analyzed in terms of the Bessel functions. The characteristics of the first ten members of the approximation are explicitly considered in this paper. The approximation is demonstrated to be realizable for all orders. Amplitude and phase characteristics are described in relation to the ideal delay operator in compact form and in terms of existing ii tabulated functions. Both amplitude and delay bandwidths are characterized by simple and accurate approximations. The maximally flat properties of both amplitude and delay responses are demonstrated. The transient …

On The Extension Of The Output Capabilities Of Flowware, A Graphical Interactive Digital System Simulator., R. Dean Delker

Masters Theses

"A research effort which addresses the problem of providing output from a register transfer level digital simulator which allows the user to better understand how his simulated system functions are described. A review of the output capabilities of existing register transfer level systems indicates that a strictly textual output leaves much to be desired, and for that reason, this work concentrates on developing forms of meaningful graphical output displays. This criterion of "meaningfulness" can be considered as a twofold objective to be reached in that the output must both reflect the functioning of the system and be presented in a …

Amine Flotation Of Feldspar From Magnetite Concentrate., Gary William Hudiburgh Jr.

Masters Theses

"The gangue in some magnetite ore bodies contains feldspar; the alkali content of the feldspar reduces the usefulness of these iron ores. One method of decreasing the feldspar content in magnetite concentrate is froth flotation.

The amine flotation of feldspar from magnetite concentrate was investigated using zeta potential measurements, Hallimond tube flotation tests and laboratory-scale flotation tests. The zeta potential of various feldspars (microcline, albite, anorthite, oligoclase and anorthoclase) were determined as a function of pH; the point of zero charge ranged from pH 1.4 to 2.5. Hallimond tube flotation tests using two amine reagents were conducted on the feldspars. …

Liquid Metal Heat Transfer In Longitudinal Flow Along A Cylinder And Flat Plate., Marvin Eugene Lohmann

Masters Theses

"In this investigation an analytical study is performed to determine the effect of axial heat conduction on laminar forced convection for longitudinal flow of liquid metals along a horizontal cylinder and a flat plate. ii

The flow and thermal boundary layers for the problems under consideration do not admit similarity solutions, the non-similarity arising from the transverse curvature; ε = (4/R) (vx/u _∞) ^½ of the cylindrical surface and from co the effect of the axial heat conduction expressible as Ω = 1/Pe_x , where Pe_x is the local Peclet number. The governing conservation equations along with …

Feasibility Study Of An Electromagnetic Trap Fusion Reactor., Dennis Gilbert Blondin

Masters Theses

"Through the use of detailed particle and energy balances, electromagnetic traps with magnetic cusps are found to be unsatisfactory for continuous operation when using only neutral particle beams to sustain a thermonuclear plasma. Low power multiplication characteristics inherent in this CTR design probably preclude supplemental plasma heating methods. However, by using an alternate Yin-Yang magnetic system, continuous CTR operating regimes are found at an ion temperature of 20 keV while assuming only neutral particle beam heating. Although these regimes require applied electrostatic potentials approaching a half-million volts, this device demonstrates a capability for efficient power production"-- Abstract, p. ii

Post Irradiation Changes Of The Elastic Modulus Of Aluminum, Dale A. Powers

Masters Theses

"Aluminum samples of 99.99% and 99.999% purity were irradiated to neutron fluences of 3·8·10¹⁸ nvt and 1.4·10¹⁹ nvt (E greater than 0.1 Mev) at one-third of the melting temperature. The change in Young's modulus of elasticity after isothermal annealing in the temperature range of 110⁰C to 130⁰C was measured. After 2.5 hours of annealing, the modulus reached a steady state value which was decreased by 0.25% ± 0.17% from the unannealed value. Electron microscopy suggests the hardening mechanisms were dispersion hardening by silicon precipitates and void hardening"--Abstract, page ii.

Two-Dimensional Radiant Interchange In A Non-Isothermal Cavity Formed By Two Semi-Infinite Parallel Plates., Robert David Allen

Masters Theses

"Two-dimensional radiant interchange between non-isothermal, gray diffuse surfaces with non-uniform radiosity have been investigated for a cavity formed by two semi-infinite parallel plates. The problem is solved for two specific emissive power distribution models. Both emissive power distributions decay exponentially with depth into the cavity. The first emissive power distribution varies in a cosine manner across the front of the plates and the second has a step variation across the front of the plates.

For the cosine varying model, separation of variables and Ambarzumian's method are applied to obtain an integro-differential equation for the radiosity inside the cavity, an integral …