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Articles 190291 - 190320 of 196433

Full-Text Articles in Engineering

Internal Friction Of Phase Separated Glasses, Scot Walter Taylor Jan 1969

Internal Friction Of Phase Separated Glasses, Scot Walter Taylor

Masters Theses

"The large internal friction peak observed in a 10Li₂O·10Na₂O·80SiO₂ glass was studied as a function of the degree of phase separation. Transmission electron microscopy was used to evaluate the type and degree of phase separation. No observable changes in the temperature position or height of the internal friction peak were observed at successive stages of phase separation. Phase separation of a mixed alkali borosilicate glass also produced no changes in the internal friction peaks. Phase separation is not considered responsible for the large internal friction peak observed in mixed alkali glasses"--Abstract, page ii.

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The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones Jan 1969

The Effect Of Small Additions Of Niobium Upon The Corrosion Rates And Electrochemical Potentials Of Iron In Hcl, Hf, And H₂So₄, Richard Lee Jones

Masters Theses

"The valence of niobium ions going into solution was determined by dissolving the metal in hot HF and measuring the volume of hydrogen evolved. The corrosion rates of Nb, NbHx, Fe and Fe - Nb alloys were determined in various concentrations of NCl, H₂SO₄ and HF. The Fe and Fe - Nb alloy samples were made by using powder metallurgy techniques. It was found that a metal skin was produced on the surface of iron corrosion samples if the carbon content of the surface layer was lower than that of the core of the sample. The lower carbon …

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Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon Jan 1969

Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon

Masters Theses

"This thesis describes a method for determining the reflection and transmission characteristics of acoustic filters under static (i.e. no flow) conditions. These characteristics are obtained by the combination of linear plane wave acoustic theory with a sequential experimental procedure. The experimental data necessary for the calculation of the reflection characteristics were obtained from measurements made on the inlet side of the filter with a standing wave tube apparatus. In order to calculate the transmission characteristics of the filter, the standing wave measurements were augmented with measurements taken on both the inlet and outlet side of the filter. This was accomplished …

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Plastic Analysis Of Beam - Columns, Ning-Cheng Tsao Jan 1969

Plastic Analysis Of Beam - Columns, Ning-Cheng Tsao

Masters Theses

"The results of an analytical study of the inelastic deformation of a wide-flange steel beam-column are presented. Emphasis has been placed on the influence of axial thrust on the pinned-end beam-column subjected to equal end moments with opposite direction. For this type of beam-column behavior, the relationship between the applied moment, axial load, and resultant curvature for the region in the plastic range has been studied in this investigation"--Abstract, page ii.

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The Influence Of Organic Matter On Shear Strength Of A Cohesive Soil, Kamran Rezvan Jan 1969

The Influence Of Organic Matter On Shear Strength Of A Cohesive Soil, Kamran Rezvan

Masters Theses

"The shearing properties of an organic A̲ horizon of Bryce clay were studied and compared with the properties of the same soil treated with hydrogen peroxide. The treatment was to remove the organic matter and isolate it as a variable. Tests were performed on artificially sedimented samples of the untreated, 75 percent untreated, 50 percent untreated, 25 percent untreated, and the treated soil. The effective stress failure envelopes were found to be higher for the untreated soil than that of the treated. The elastic deformation, however, was larger for the untreated samples. The pore water pressure development due to shearing …

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Determination Of Distillation Efficiencies For The Water-Methanol-Acetone System, Chorng Shyong Wang Jan 1969

Determination Of Distillation Efficiencies For The Water-Methanol-Acetone System, Chorng Shyong Wang

Masters Theses

"A pilot-scale, eight-plate, bubble-cap distillation tower with a multi-point temperature recorder and automatic sampling device was used to obtain operating data on temperatures and liquid phase compositions for distillation efficiency studies. The tower was run with a single feed, a total condenser, and a partial reboiler. At steady state, as indicated by constant temperatures, samples were taken and later analyzed by gas chromatography. A digital program was developed to calculate component efficiencies on each plate according to Holland's modified Murphree plate efficiency, utilizing the operating data, and reflux rate, the input and output flows and compositions, and vapor-liquid equilibrium data. …

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Study Of Diagnosability Of Binary Address Decoders, Girishchandra Mahendrakumar Gandhi Jan 1969

Study Of Diagnosability Of Binary Address Decoders, Girishchandra Mahendrakumar Gandhi

Masters Theses

"This paper studies the diagnosability of various types of binary address decoders. An attempt is made to develop a theory of diagnosis for logical faults that might occur in these logic nets. The developed theory is used to analyze these logic nets for various input combinations. Finally, the derivation of optimum diagnostic test sequences is considered"--Abstract, Page i.

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Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai Jan 1969

Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai

Masters Theses

"The experimental investigation was conducted to determine temperature distribution and convective heat transfer coefficients in terms of Nusselt number for an inclined heated flat plate in air. The heated surface of the aluminum flat plate was set facing upward and moved through seven positions from the vertical to the horizontal. The investigation shows that the local Nusselt number can be predicted by Kiekus's solution within 12 per cent for inclination angles from the vertical through 75° from the vertical. In the case of the vertical position, Eckert's solution gives a better prediction. For the horizontal position the results show good …

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Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy Jan 1969

Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy

Masters Theses

"This paper is a report of an investigation of an approximate method for finding the principal mode frequency roots for beams in transverse vibration. The method utilizes approximate transmission matrices obtained by a power series expansion of the basic differential equation which governs the transmission matrix. Investigation has been carried out to examine the efficiency of the method in producing the first several normal mode frequency roots. This has been achieved by applying the method to several uniform and non-uniform beams and comparing the results with the exact solutions. The technique has further been applied to non-uniform beams of tapered …

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Design, Construction, And Initial Experiments With High Hydrostatic Pressure Extrusion Device, Edward Moniz Jorge Jan 1969

Design, Construction, And Initial Experiments With High Hydrostatic Pressure Extrusion Device, Edward Moniz Jorge

Masters Theses

"The purpose of this study was to design and operate equipment with which the study of polymer extrusion would be possible at hydrostatic pressures up to 50,000 psi. By hydrostatic pressure is meant the pressure of the region of the extrudate. A study of the effects of back pressure on the extrusion of silicone gum was attempted--Abstract, Page ii.

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The Influence Of Several Factors On The Rate Of Secondary Compression Of Soil, William Joel Green Jan 1969

The Influence Of Several Factors On The Rate Of Secondary Compression Of Soil, William Joel Green

Masters Theses

"This research program has been undertaken to study the influence of load increment ratio, temperature, and sample thickness on Cα (rate of secondary consolidation) for a high organic content and low organic content soil. Consolidation equipment was designed to produce constant temperatures both above and below ambient, and to accommodate both 3/4 and 1 1/2 inch thick samples. Samples were molded into oedometer rings at the liquid limit. It was found that Cα was independent of the sample thickness and load increment ratio for both the high organic and low organic soils. The influence of temperature on Cα was found …

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Telecommunications System Design Considerations For Advanced Logistic Spacecraft, James Myron Romberg Jan 1969

Telecommunications System Design Considerations For Advanced Logistic Spacecraft, James Myron Romberg

Masters Theses

"The telecommunications system design goals and functional requirements for an advanced logistic spacecraft are presented qualitatively. Advanced equipment and techniques that meet these system requirements and goals, that are within the state-of-the-art and that are believed to be economically feasible, are enumerated and described. System emphasis is on unification to minimize RF links and antenna subsystems, and on use of functional redundancy to assure satisfactory performance of critical telecommunication functions. The interaction of the telecommunications system design and the spacecraft mechanical, environmental, electrical, and operational interfaces are described in qualitative and quantitative terms. A practical spectrum of system interface characteristics …

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A Study Of A Lead Mining Waste Water Pollution Problem, William Earl Anderson Jr. Jan 1969

A Study Of A Lead Mining Waste Water Pollution Problem, William Earl Anderson Jr.

Masters Theses

"The waste water from the Fletcher Mine of the St. Joseph Lead Company was producing large algal growths in Bee Fork Creek. A field and laboratory study was conducted to determine the characteristics of the waste, find a method of determining the pollutional materials contained in the waste, study the undesirable algal growths, and develop and evaluate a practical, inexpensive, and effective pollution abatement method. Laboratory studies included analytical analysis of the waste, flotation reagent analysis, a microscopic study of the algal growths, algal growth studies, and heavy metal analysis of the algal growths. Field work comprised: a study of …

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A Five-Spot Waterflood Process As Applied To The Digital Computer Based On The Prats Technique, Leonard Koederitz Jan 1969

A Five-Spot Waterflood Process As Applied To The Digital Computer Based On The Prats Technique, Leonard Koederitz

Masters Theses

"The technique for the prediction of injection rates and production history of a five-spot secondary recovery field pattern as presented by Prats has been significantly modified to permit rapid and accurate digital applications eliminating the heretofore prohibitive reliance upon electrolytic model results for intermediate data values following water front breakthrough"--Abstract, page i.

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Anodic Behavior Of Semiconducting Insb Single Crystals In Acidic Solutions, Lih-Da Hu Jan 1969

Anodic Behavior Of Semiconducting Insb Single Crystals In Acidic Solutions, Lih-Da Hu

Masters Theses

"Undoped, semiconducting single, n-type, InSb crystals were used to study the different etching behavior of the inverse {111} planes, to determine the apparent electron number of InSb under anodic dissolution (which corresponds to the sum of the absolute values of the oxidation numbers) and to investigate whether or not the inverse {111} planes show potential differences. The In {111}, Sb {111[repeating]}, {110} and {100} faces were highly polished, etched and immersed in various acidic solutions. Several new etch patterns of the inverse {111} faces were observed in giving other possibilities to distinguish both of the planes. The significant differences in …

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Numerical Simulation Of One-Dimensional Three-Phase Fluid Flow In A Stratified Petroleum Reservoir With No Cross-Flow, Ali Mohammed Akbar Jan 1969

Numerical Simulation Of One-Dimensional Three-Phase Fluid Flow In A Stratified Petroleum Reservoir With No Cross-Flow, Ali Mohammed Akbar

Masters Theses

"A numerical model for linear, three-phase fluid flow in a stratified petroleum reservoir has been developed for the purpose of studying water-flooding performance characteristics. Gravity forces, capillary pressure and cross-flow were neglected, but the fluids were considered compressible and evaluations of dissolved gas concentrations have been accounted for. The model was used in evaluating the performance of a water flood project for a hypothetical reservoir which contained the three phases of oil, gas, and water. The results were then compared with those obtained using the Dykstra-Parsons technique. The model produces results which were found to be similar to those obtained …

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A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill Jan 1969

A Continuous Method For Determination Of The Evaporation Rate Of Zinc, Paul Alan O'Neill

Masters Theses

"A method for determination of the evaporation rate of zinc using a continuous recording balance has been devised. Tests were carried out under an inert gas over the range 600°C to 750°C with a total pressure of 1 atmosphere. It was found that the rate of evaporation doubled with an increase of 50°C in this range. Scanning electron microscope photographs show the crystalline nature of the condensate and the presence of a thin oxide layer on some solidified test samples. This oxide layer reduced the rate of evaporation by retarding the zinc vapor escape from the evaporating surface"--Abstract, Page iii.

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Simulation Of The Cyclic Steam Injection Process In A Petroleum Reservoir By A Finite Difference Mathematical Model, Jean-Claude Bernys Jan 1969

Simulation Of The Cyclic Steam Injection Process In A Petroleum Reservoir By A Finite Difference Mathematical Model, Jean-Claude Bernys

Masters Theses

"A three-phase, one-dimensional radially layered reservoir simulator is programmed for a large memory digital computer. It is designed to provide a practical solution to the problem of determining optimum soak time during an intermittent steam injection process. The general approach is to (1) develop a representative mathematical model which describes the reservoir; and (2) employ a suitable numerical technique to solve the system of equations which comprises this model. The reservoir consists of concentric cylinders around the wellbore, a pay-zone stratified into thermally connected layers limited on the top and on the bottom by an impermeable cap and base rock, …

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A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya Jan 1969

A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya

Masters Theses

"A theoretical analysis of the free vibrations of a clamped circular plate was undertaken. The effects of transverse shear were considered for application to relatively thick plates in which there exist sharp transients and frequencies corresponding to higher modes. The method adopted by R. D. Mindlin was used to develope [sic] the differential equation of motion for the plate. The damping effect due to the resistance of the medium in which the plate vibrates was also considered. This damping was assumed to be due to the generation of pressure waves caused by the displacement of the plate...Since the solution requires …

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Computer-Aided Design Of Lossless Non-Uniform Transmission Lines, Larry Lee Wesner Jan 1969

Computer-Aided Design Of Lossless Non-Uniform Transmission Lines, Larry Lee Wesner

Masters Theses

"A numerical iterative design technique is presented for the synthesis of lossless non-uniform transmission lines. A variational approach is used to minimize an error functional to which the system and boundary equality constraints have been adjoined by Lagrangian multipliers. The resultant network optimization conditions lead to an iterative scheme requiring analysis of the non-uniform line, analysis of an adjoint system and calculation of the error gradient in parameter space. A steepest descent procedure is used to optimize parameter values. Finite difference equations are used to provide an approximation model for implementation on the digital computer. A design example and a …

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The Anodic Dissolution Of Molybdenum In Acid Sulfate Solutions, Ching-Kuo Chen Jan 1969

The Anodic Dissolution Of Molybdenum In Acid Sulfate Solutions, Ching-Kuo Chen

Masters Theses

"The world's resources of metals are decreasing. Due to this and the cost of replacing corroded materials, it has come to be realized that prevention is better than cure. The increasing demand for molybdenum and molybdenum alloys has stimulated a great amount of research into the corrosion characteristics of these materials. The result of such research has assisted in the development of suitable molybdenum alloys and protective coatings to retard corrosion. When a molybdenum anode and a suitable cathode are immersed in an oxygen-free electrolyte and are connected to a direct current power source, molybdenum is dissolved. This process is …

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The Anodic Dissolution Of Molybdenum In Alkaline Solutions, Chen Hwei Chi Jan 1969

The Anodic Dissolution Of Molybdenum In Alkaline Solutions, Chen Hwei Chi

Masters Theses

"Details concerning the anodic dissolution of many metals in various solutions are still unknown. Discrepancies are found between the actual weight-loss of an electrode and that calculated from coulometric data. The purpose of this investigation was to study the anodic dissolution of molybdenum (Mo) in basic solutions to determine the apparent valence of Mo ions going into solution, the nature of any surface films formed during dissolution, and the polarization behavior. Three electrolytes were used: 1 N potassium hydroxide (pH = 13.6), 0.667 N potassium carbonate (pH = 11.5), and potassium carbonate-potassium sulfate mixture (pH = 9.5). chloride ion additions …

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The Use Of Turbulence Energy Equation In Boundary Layer Study, Ro-Chi Tai Jan 1969

The Use Of Turbulence Energy Equation In Boundary Layer Study, Ro-Chi Tai

Masters Theses

"A turbulent boundary layer problem has been studied analytically and compared with an available experiment in the literature. Correlations of the experimental data were made to investigate the validity of the commonly used empirical relations on turbulent shear stresses. It was found that the model which related the local turbulent shear stress linearly with the local turbulent kinetic energy, as used by Bradshow et. al., appeared to be most reasonable. combining this model with the expression of turbulent viscosity given by Boussinesq, it was then possible to introduce the turbulence-energy equation in addition to the governing equations of continuity and …

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Analog Simulation Of Mass Transfer In Droplets With Turbulent Internal Circulation, Jeffrey Tsai-Hwa Kuo Jan 1969

Analog Simulation Of Mass Transfer In Droplets With Turbulent Internal Circulation, Jeffrey Tsai-Hwa Kuo

Masters Theses

"The object of this thesis is to simulate the Handlos and Baron Model for mass transfer into droplets by using an iterative analog computer in order to obtain eigenvalue and other parameters in a series solution. The eigenvalues λn calculated in this work are compared with the results obtained by Wellek-Skelland using a variational technique and by Patel using numerical approaches on the digital computer. From the analytical series solution, one can calculate the fraction of solute extracted in the droplets as a function of droplet contact time. PACTOLUS, a digital-analog simulator, provides a check on the validity of …

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A Digital Technique For Combining Frequency Standards, Lynn James Hawkey Jan 1969

A Digital Technique For Combining Frequency Standards, Lynn James Hawkey

Masters Theses

"A new technique for combining multiple frequency standards into a single timing reference based on the average of the frequency of each input is described. The uniqueness of this approach is that it is an all-digital scheme utilizing delay lines and high-speed logic elements currently available. The present and future applications of combiners are discussed, the requirements are highlighted, several digital solutions are briefly described, and the detailed block diagrams and characteristics of a particular general purpose combiner are presented. It is suggested that the optimum combiner include a stable quartz crystal oscillator with a frequency control feature. The output …

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An Investigation Of The Application Of Photoelastic Coatings To Soil Studies, James Kenneth Meisenheimer Jan 1969

An Investigation Of The Application Of Photoelastic Coatings To Soil Studies, James Kenneth Meisenheimer

Masters Theses

"The purpose of this investigation was to determine if photoelastic coatings could be adapted to soil systems and used as a workable tool for analyzing deformation and stress distribution. The required physical properties of a photoelastic coating on soil is discussed and a number of photoelastic materials are investigated as possible soil coatings. Mixing procedures, coating application techniques, curing methods, testing procedures, and results are discussed for gelatin and several plastics. Compacted soil samples and extruded soil samples from a Vac-Aire extrusion device were coated with reflective and photoelastic coatings and then loaded in an unconfined compression machine. The stress …

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A Design Oriented Digital Design Language, David Michael Rouse Jan 1969

A Design Oriented Digital Design Language, David Michael Rouse

Masters Theses

"A digital design language is presented here which is more consistent with the design sequence of digital computer than existing languages. An ideal design sequence is first investigated and the following desirable design language characteristics obtained. A good design oriented language must be: 1) multi-level, 2) capable of expressing ideas easily, 3) easily understood, 4) machine acceptable, 5) modular and, 6) capable of showing timing and control. It should also be: 1) independent of technology, 2) unrestricted to any particular structural feature such as serial processes, synchronous processes, etc., 3) concise, 4) precise, and 5) non-ambiguous. With regard to these …

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Basic Design Of Mosfet, Four-Phase, Digital Integrated Circuits, Earl Morris Worstell Jan 1969

Basic Design Of Mosfet, Four-Phase, Digital Integrated Circuits, Earl Morris Worstell

Masters Theses

"MOSFET is defined as metal oxide semiconductor field-effect transistor. The integrated circuit design relates strictly to logic and switching circuits rather than linear circuits. The design of MOS circuits is primarily one of charge and discharge of stray capacitance through MOSFETS used as switches and active loads. To better take advantage of the possibilities of MOS technology, four-phase (4[phi]) circuitry is developed. It offers higher speeds and lower power while permitting higher circuit density than does static or two-phase (2[phi]) logic. Equations are developed that apply directly to the design of four-phase logic along with examples of circuitry that show …

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A Study Of The Nucleate Boiling Of Liquid Nitrogen, Liquid Argon, And Liquid Carbon Monoxide From Atmospheric To Near The Critical Pressure, Craig Bauer Johler Jan 1969

A Study Of The Nucleate Boiling Of Liquid Nitrogen, Liquid Argon, And Liquid Carbon Monoxide From Atmospheric To Near The Critical Pressure, Craig Bauer Johler

Masters Theses

"The nucleate boiling curves of three corresponding states liquids (nitrogen, argon, and carbon monoxide) were analyzed. Each liquid was studied at pressures ranging from atmospheric pressure to near the critical pressure. Saturated liquid boiling was conducted from cylindrical heaters in the horizontal position having diameters of 0.75 inches and lengths of three inches. Liquid nitrogen was boiled from four different gold heat transfer surfaces; argon and carbon monoxide were boiled from the same gold surface. The critical heat flux correlation of Cobb and Park was further verified by agreement with the experimental critical heat flux ratios obtained in this investigation. …

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Experimental Determination Of Dynamic Properties Of Aluminum Including Poisson's Ratio, Terry Lee Holman Jan 1969

Experimental Determination Of Dynamic Properties Of Aluminum Including Poisson's Ratio, Terry Lee Holman

Masters Theses

"Two rods of 7075-T651 aluminum are longitudinally impacted to investigate the material's dynamic properties. The test rod, initially at rest, is instrumented with strain gages to record the strain-time history after the impact rod, accelerated to uniform velocity by an air gun launcher, strikes the test rod. A camera records the strain-time pattern displayed on an oscilloscope. The experiment indicates a consistent rise time of approximately 9 µsec. Simple one-dimensional theory correlates well with the experimental data. Compensation is included for the transverse sensitivity of the gages used. The dynamic values for both the modulus of elasticity and Poisson's ratio …

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