Engineering Commons^™

An Electrolytic Polishing And Recrystallization Study Of Zinc And Zinc Alloys., Roy Ashley Smith

Masters Theses

"A Unitron hot stage and polarized light were used to enable direct observation of recrystallization in high purity (99.99 per cent) zinc and high zinc content alloys. Electrolytic polishing was investigated in an attempt to prepare unetched surfaces which would show good structural contrast under polarized light and thus permit structural changes occurring during recrystallization to be observed.

Kinetic data obtained from a sequence of photographs during each recrystallization trial showed typical sigmoidal isothermal reaction curves characteristic of a nucleation and growth process. It was determined that rates of nucleation and grain growth are a maximum over the same time …

Permeability Of Organic Protective Coatings And Relation To Film Thickness, Bipin N. Doshi

Masters Theses

“Special types of coating systems are used to protect industrial products and structures against corrosion. Many millions of dollars are spent each year for these coatings. The ability of protective coatings to reduce or inhibit corrosion depends on a variety of factors such as dry film thickness, resistance to permeation of ions and vapors, temperature, pressure, structure of binder, nature of pigment, electrolytic resistance, and many others.

The initial work done by Larry Inglis on the permeability of coatings and it's relation to thickness of coating films showed that the permeability, as determined by under film corrosion, was independent of …

A Study Of The Relative Electric Resistance Of Commercial Steels And Pure Iron, William Eugene Wistehuff

Masters Theses

"The change in relative electric resistance of five commercial steels, Armco Ingot Iron and Pure Iron were studied over the temperature range of 800°C to 1100°C in an attempt to correlate the phenomena of hot or red shortness with a change in the Electric resistance .

The results from the above resistance measurements were compared with mechanical tests of the same steels to show that at the point at which the iron sulfide liquid forms there is a definite change in the slope of the electric resistance vs temperature curve.

Also studied was a discontinuity in the electric resistance vs …

A Study Of The Haeffner Effect In Mercury, James Nicholson Baysden

Masters Theses

"In 1953, E, Haeffner reported that when he passed a direct electric current through a capillary tube filled with mercury, he obtained a separation in the isotopes of mercury with the heavier isotopes being enriched at the negative terminal and the lighter isotopes at the positive terminal. This effect has since been referred to as the Haeffner Effect, Since the original experiment with mercury, other investigators have observed this effect in many other liquid metal systems.

This investigation of the Haeffner Effect in mercury involves the use of a radioactive isotope of mercury (Hg 203) as a tracer to follow …

Parameters In Ablation Heat Sheilds, Franklin Chang Liang Lin

Masters Theses

"The desired result of this paper is a method of determining temperature distribution and burn off rate in a semi-infinite rod or shield subjected to a large heat flux. The possible methods of determination were investigated, and it was felt that an analytical approach turned out to be the most feasible.

The analytical analysis employed involves the use of the Fourier's general equation for one dimensional heat flow. Transformations from stationary to moving coordinates reduces the problem from unsteady state to steady state boundary conditions. The resulting equations can be applicable to the extent for the heat flow problems involving …

Determining Design Freedom Of Linear Feedback Control Systems, Harley D. Brixey

Masters Theses

“The problem confronted in this thesis is to develop a method or procedure to be used in determining the amount of design freedom that is available in any given linear feedback control system by working with the signal flow-graph representation of the system.

Literature was reviewed that deals with basic signal flow-graph theory and degrees of design freedom. Signal- flow-graph theory that forms a foundation for the development is presented.

The development consists of starting with an essential signal-flow graph of order one. The sensitivity and transmittance functions are written for this essential graph in terms of graph symbols; then …

Impulsive Loading Of Metals And Alloys, William Barnes Mclane

Masters Theses

“This thesis deals with the construction of an explosive deformation apparatus. Using the apparatus an investigation was made of the deformation changes in the structure of a 10% uranium-aluminum alloy and a hot rolled high carbon Manganese steel. Also a study of deformation through different thickness of Stainless Steel, Type-304, plates was carried out.

All of the deformations were obtained using a constant explosive charge consisting of a #6 commercial blasting cap coupled with a commercial chemical booster"--Abstract, page ii.

Thermocouple Shape Influence On Response In A Dynamic Compressible Fluid Atmosphere, Philip J. Steger

Masters Theses

"This investigation was performed to determine whether the geometrical shape of a thermocouple used to measure the temperature of a dynamic fluid atmosphere had any affect on its recovery factor and time response.

A converging nozzle was used to establish a dynamic fluid stream in which shaped silver solder junctions of copper-constantan thermocouples were tested. The velocity of the working fluid, air, was about 1000 ft/sec at the test point.

The investigation was successful, within experimental limits, in determining that the recovery factor of a bare thermocouple junction is not influenced by geometrical shape The results agreed substantially with available …

Interaction Curve For A Beam Column., Mahendra Khushalchand Sanghavi

Masters Theses

"The theoretical interaction curve for a circular section is established. Experimentally the interaction curve f or a beam-column with a varying circular cross section, is established. The effect of stress history is discussed, and the comparisons of different interaction curves are made"--Abstract p.i

The Design, Construction, And Calibration Of An Apparatus To Determine The Thermal Conductivity Of Solids, Alan Edward Stephenson

Masters Theses

"Many pieces of equipment have been designed to determine the thermal conductivity of solids. They all, however, depend on the application of Fourier's equation of heat conduction in solids to determine the thermal conductivity. The apparatus used in this investigation is a modification of the guarded hot plate method used by the American Society for Testing Materials. Operation of the device is given in a step by step procedure both as a guide for others and also to show how it was operated during calibration of the apparatus. Data obtained in the calibration is given in tabular and graphical form …

Derivation Of A Method To Determine Reactions And Deflection Of A Continous Beam On An Elastic Foundation, Louis Richard Fuka

Masters Theses

“The purpose of this thesis is to develop a method for determining the reactions and deflection curve of continuous beams partially supported by an elastic foundation. The method involves representation of an arbitrary loading and the intermediate redundant reactions as Fourier Series. Redundant intermediate reactions are determined by the solution of an equal number of linear equations. The remaining reactions are determined by the application of statics.

This same method can be used for simply supported beams on an elastic foundation and for continuous beams without an elastic foundation”--Abstract, page ii.

Preliminary Investigation Of Acid Treatment For The Stabilization Of Doloma, Deward Pan

Masters Theses

"The work presented in this thesis is the result of an investigation to develop an economical and successful means for producing a stable, hydration resistant compound on the surface of doloma particles by an acid treatment, which does not significantly alter the refractoriness of the material. Granite, a commercial doloma, from Valley Dolomite Corporation, was treated with different concentrations of inorganic acid-water solutions and organic acid-alcohol solutions for varying time at atmospheric pressure and temperature. The treated doloma was examined by (l) X-ray diffraction and (2) the hydration test.

It was found that the organic acid acted as a coating …

The Applicability Of Longwall Mining To American Coal Seams, Mehmet Turgut Tezcanli

Masters Theses

"The objective of this thesis is to show that mechanized longwall mining can be applied to thinner American coal seams with greater advantage than the conventional mechanized room-and-pillar methods now being used, provided that the proper equipment is employed in an effective manner."--Objective, page 1.

An Engineering Evaluation Of Surficial Soils Of Dent County, Missouri, William L. Durham

Masters Theses

“This study is the report of an investigation to: Determine the engineering characteristics of Dent County, Missouri soils using a pedologic soil association map for areal extrapolation of soil test data; and, Evaluate the feasibility of determining the engineering characteristics of all Ozark Region soils by the same method.

During the course of the study, the geology and pedology of the county was investigated and a sampling and testing program formulated. Pedologic soil types in each soil association area were sampled, tested in the laboratory, and the results interpreted.

The results obtained showed that the engineering characteristics of the soil …

The Separation Of Strontium-90 From Cesium-137 And Fractionation Of Rare Earth Elements By Liquid-Liquid Extraction., Surendra D. Khanna

Masters Theses

No abstract provided.

A Study Of Rotational Critical Speed For A Multi-Mass System, Richard K. Brockmann

Masters Theses

"The object of this thesis is to demonstrate, by use of an IBM-1620 digital computer, a fast efficient method for locating natural frequencies of multi-mass rotational systems. Stress and deflection characteristics are examined at these frequencies also.

The shafts considered in this thesis are simply supported and symmetrically loaded with five concentrated masses. These five masses are placed at increments of 10 inches on a 60 inch shaft. The variable to be examined is shaft diameter, which is varied from 0.2 inch to 1 inch by increments of 0.2 inch. The effect of shaft weight, which is a function of …

Experimental Stress Analysis Of Bolts In A Flange Coupling, Bansidhar Shah

Masters Theses

"This thesis deals with the strength of a bolted joint which is subjected to tensile and bending loads. The purpose of this investigation was to derive expressions for the stresses developed in the bolts and the load producing separation of the joint.

A laboratory study of a flange coupling was made and the behaviour of flange bolts under different clamping forces was studied in tension and bending tests. The strain in the bolt was measured by mounting the strain gages on the shank of the bolt. From this, a graph of applied load versus strain in the bolt was plotted. …

A Dilatometric Study Of The Martensite Transformation And Maraging Behavior Of A Ni- Co- Mo Steel, Neal Matthias Griesenauer

Masters Theses

"An experimental investigation or the austenite to martensite transformation and the maraging behavior taking place in a nickel-cobalt-molybdenum steel was conducted for this project.

The austenite to martensite transformation was followed by the dilatometric method, being done on a Leitz Optical Dilatometer. An apparatus was constructed for the dilatometer in order to record dimensional changes at low temperatures, thus broadening the possible applications for the instrument.

The maraging behavior was investigated by means of metallographic analysis and hardness determinations"--Abstract, page i.

A Graphical Solution Method For The Tchebychev Elliptic Function Filter, Gene S. Luckfield

Masters Theses

"This thesis is concerned with the design of the Tchebychev elliptic function filter. The Darlington synthesis procedure is discussed and salient points from Darlington's paper needed for the design of this filter are presented.

It is shown that the design of the Tchebychev elliptic function filter requires a knowledge of the elliptic functions, particularly the elliptic sine. Since the use of these functions is not common, a brief review of their properties is presented.

Using the elliptic functions, a development of the equations describing the behavior of the Tchebychev elliptic function filter is given for the case of a normalized …

A Model Investigation Of The Water Coning Phenomenon., Gary L. Downey

Masters Theses

"Results and procedures are presented covering the design and construction of a dimensionally scaled model of an oil reservoir and its use in investigating the problem of water coning. The theoretical considerations involved in the analytical solution of the water coning problem and the methods used in constructing, designing, and operating the above model are presented.

Four water coning experiments have been completed using the model. Three of the four runs have produced significant results. The information obtained from these experimental results have shown that the laboratory model is well suited for investigating oil reservoir problems such as water coning …

A New Method Of Making Stainless Steel Powder By Electrochemical Disintegration, Mohammed Maher Saad

Masters Theses

"This paper describes a new method of making austenitic stainless steel (18/8) powder by electrochemical disintegration. The method used an external direct current applied to a heat-treated stainless steel anode, and a platinum cathode in an electrolyte of an aqueous solution of 20% HNO₃ and 1% H₂SO₄ by weight respectively.

Special attention has been paid to the size distribution of sieve and sub-sieve sizes, and the following ranges were found: approximately one-half lies between the limits of 200 and 325 mesh, and one third is finer than 325 mesh, with the remainder about +200 mesh, average …

A Rc Active Delay Time Network., Robert Sun-Wu Han

Masters Theses

"This thesis presents a method for performing an approximate synthesis of a variable delay time network by using RC elements and active analog computer circuits. The delay networks discussed here can provide delay times which range from zero to 96 milliseconds for inputs with frequencies which range between zero 2nd 5 cycles per second.

Basically, the procedure involves approximating the delay time transfer function, e^-jwTd , by the ratio of two polynomials each of which is represented by a finite series of terms. The ratio is then shown to be easily synthesized by RC elements and analog computer circuits. …

An Approach To Correlate Pulsed Radar And Photographic Data, Nasir Ahmed

Electrical and Computer Engineering ETDs

The Jet Propulsion Laboratory Lunar Program, which is supported by the National Aeronautics and Space Administration has two major projects underway. These are Ranger and Surveyor. The Ranger Project is in the flight stage whereas Surveyor is still in hardware development. The equipment of Ranger 3, 4, and 5 spacecrafts includes a radar altimeter to obtain radar reflection data, and a vidicon camera to obtain close-up pictures of the moon's surface. The data obtained in these flights will thus be available for analysis and comparison using the techniques outlined in this thesis.

The Monopole Antenna With A Small Number Of Radials, S. H. Durrani

Electrical and Computer Engineering ETDs

This paper reports a study of an antenna system consisting of a vertical monopole and a small number of insulated horizontal radials lying lightly on the ground.

The monopole antenna has long been popular for medium frequency broadcasting because of its inherent simplicity and economy. Although quarter-wavelength resonant structures were used in the early days, it was shown by Ballantine (1924) that for a given power, the strongest field strength at the radio horizon was produced by an antenna about 0.6 wavelength long. This ignored the sky wave and was based on the assumption of a perfectly conducting (and reflecting) …

A Parametric Study Of The Heat Transfer Characteristics Of A Moving Band Heat Exchanger, Larry Hyde Brim

Theses and Dissertations

In recent years much attention has been devoted to the development of efficient heat exchangers. The regenerative or moving matrix heat exchanger is one type which has been considered. Most regenerative heat exchangers use one of the conventional types of high area matrices mounted in a drum or disk in such a manner that it can be moved in a continuous cycle from a cold fluid stream to a hot fluid stream and back again. A rather different approach to the design of a regenerative heat exchanger which has been patented in this country is a set of flexible moving …

Hypersonic Plasma Thermionic Generator, Andre R. Leblanc

Electrical and Computer Engineering ETDs

The Langmuir two-probe system is extended to cover the case of electron emission from one of the probes. The contact potential difference between the two probes is also included as part of the equations. One of the probes, known as the emitter, operates at sufficiently high temperatures such that electron emission occurs, while the other probe, known as the collector, operates at low enough temperatures such that its electron emission can be neglected.

Linear Side-Loaded Transmission-Line Antennas, Robert W. Kulterman

Electrical and Computer Engineering ETDs

A need has arisen in recent years for a mobile transmitting antenna capable of radiating large amounts of power as efficiently as possible in the frequency range from 10 to 40 kc. Several mechanical and electrical problems are encountered in building and operating such an antenna.

An Electronics Course Of Study For The High Schools In The Highline School District, Rual Elmer Tigner

Graduate Student Research Papers

Electronics is now being taught in the Highline District in one course for one year in each of the four high schools. There are no formal district objectives tor this course, no sequence of instruction, no list of course content. The writer has felt the need for the above and has interviewed all four instructors in the district and the assistant superintendent of instruction. It was agreed that in order to provide a more meaningful, correlated program, it would be necessary to have such a district-wide course of study developed. In view of this, the writer has attempted to develop …

Cutting School Building Costs Through Educational And Architectural Planning, Construction Details, And Contracting, Alan Dale White

Graduate Student Research Papers

It was the purpose of this paper to point out the factors pertaining to educational and architectural planning, construction details, and contracting which collectively tend to lower the building expenditures. Specific architectural details such as wall cost comparisons, structural framing, and material recommendations have been purposely deleted. The suggestions presented herein, general in nature, do not seriously restrict architectural imagination, ingenuity, or creativity.

Stress Analysis Of An Infinite Cylinder With An Irregular Shaped Cavity Using Complex Variable Techniques, Gerald H. Lindsey

Theses and Dissertations

The advancement of modern technology has brought with It a demand upon the engineer for more thorough analysis techniques. This has been precipitated by the advent of missiles and space-craft that do not permit regular inspections to determine causes of failure, crack propagation, design weaknesses, etc. Thus, a more complete analytical work must be performed to facilitate a foreknowledge of reaction and performance of a particular design to its environment.