Digital Commons Network^™

The Effect Of Cation Size Of Xanthate Collectors In Sulphide Flotation., R. W. Bourne

Masters Theses

"Batch flotation tests on Utah Copper ore were used to show the effect of collector cation size.

The results obtained were:

(1) Recovery of copper in the concentrate decreases with increase in the size of the collector cation.

(2) Increased recovery with ethyl over that for amyl with a given cation.

(3) No beneficial recovery with sulphur enriched xanthates.

Statistical techniques were used to ascertain if significant differences in results were present"--Abstract, p. i

The Effect Of Moisture Content On The Action Of Sea Coal In Molding Sands., Robert J. Endres

Masters Theses

"An assumption was made that an increase in moisture content in the sand would result in an increase in the amount of volatile matter retained in a sand, clay, water, and sea coal mixture which had been subjected to the heat of molten iron. Because of a lack of positive evidence to support this assumption, it was concluded that the volatile matter retained within the sample is independent of the moisture content.

It was also shown that the volatile products do not travel back through the sand, away from the mold-metal interface. Rather, the volatiles escape from the sand and …

The Removal Of Residual Organic Materials From Sewage Plant Effluents Using Continuous Foam Flotation., Ajab S. Malik

Masters Theses

"This investigation was conducted to determine the feasibility of using a continuous foam flotation process for the removal of soluble organic materials from sewage treatment plant effluents. All effluents contained alkyl benzene sulfonates (ABS), derived from synthetic detergents. The studies were conducted on a laboratory scale. The reduction in the chemical oxygen demand was used as a measure of the effectiveness of the removal of the organic materials. In addition, ABS determinations were employed to study the fate of the detergent.

A flotation cell, equipped with the means of controlling the air and liquid flow rates, was used. Air flow …

The Resolution Of Two Known Signals In White Gaussian Noise., Peter Cheng-Fang Wang

Masters Theses

"The problem of resolving two signals F1(t) and F2(t) in white Gaussian noise n(t) is treated here as a problem in statistical decision theory. We assume a situation in which one of two similar signals is present and an observer is asked to make a decision concerning which of the signals is present with a tolerable probability of error. The observer is allowed to use the best system which he can design for this particular purpose. Of course, this observation will be disturbed by noise and therefore, the observer is led to ambiguous selections. It is apparent that the optimum …

The Plastic Behavior Of Beams With Butt Welded Connections., Paul George Hayes

Masters Theses

"The purpose of this study is to determine the length of butt welds required to develop the full plastic section modulus of a 6 WF 20 rolled section of A-36 steel. The members were electric arc welded with LR 6070 electrodes. Two-point loading was used to develop a zone of pure moment with zero shear where these members were joined.

At the cross-section to be welded, all the flange edges were prepared to receive a single-vee butt weld and the webs were prepared for a double-vee butt weld. In all cases the full length of the flange was welded. However, …

A Study Of The Phase Behavior Of Carbon Dioxide-Methane-Normal Decane Systems, Raja Audi Mansoor

Masters Theses

“The effect of carbon dioxide concentration, on solubility has been studied for several carbon dioxide-methane-n-decane systems. Experimental results were obtained using differential vaporization tests. Computational results were obtained using equilibrium constants.

The relation between solubility, bubble point pressure and solution carbon dioxide is presented. A ternary diagram showing the bubble point pressure behavior as a function of system composition is also presented”--Abstract, page ii.

The Imperfect Structure Of Ti-, Zr-, And Hf- Nitrides Containing An Excess Of Nitrogen., Chester A. Faunce

Masters Theses

"Chemical analyses were made on all three nitrides using oxidation, Kjeldahl, dissolution and gas evolution techniques, and the chemical formulae were calculated. They are as follows: Ti_0•931^N, Zr_0•970^N, and Hf_0•792^N.

The lattice constant of all the nitride samples was determined at 25°C. The Ti_0•931^N sample obtained from Union Carbide Company had a lattice parameter of 4.23986± 0.00007A⁰, while the sample from W. Germany, Ti_1.0^N in the as received condition had a lattice parameter of 4.24027 t 0.00003A⁰• A second lattice parameter determination was …

The Anodic Dissolution Of Cadmium In Aqueous Solution, Yun-Chung Sun

Masters Theses

"The increasing importance of prevention of corrosion in industry has stimulated extensive studies on the fundamental behavior of metals in corrosive media.

The basic mechanism of the anodic dissolution of metals such as cadmium, magnesium, and zinc in salt solutions is not completely known. Several mechanisms have been proposed by different investigators, but evidence is still lacking to draw unquestionable conclusions to explain the discrepancies which often arise between coulometric data and weight loss of metal electrodes in certain salt solutions.

The purpose of this investigation was to obtain experimental data for anodic dissolution of cadmium in various electrolytes and …

Sonic Flow Meter., Daniel E. Wilson

Masters Theses

"The purpose of this thesis was to construct a device to measure the velocity of air employing sound waves. The principle of operation of the device is that the time interval required for the sound wave to travel between two points in the duct is a function of the fluid velocity. This time interval was measured both with the air flowing and with the air stationary. An equation was derived such that the mean velocity of the flowing air could be calculated by knowing the two-time intervals.

The mean velocity determined by this device was compared to the mean velocity …

Time Optimum Switching Zones In Multiple-Valued Control Systems, Jack Leroy Crawford

Masters Theses

"Present control system theory provides the criteria necessary to bring a second-order single-valued system to rest in a minimum time after a step input. The bang-bang type controller has been developed to obtain this optimum response.

However, existing theory fails to provide the necessary information to obtain the optimum response from a second-order rotational system when multiple values of angular position are allowed. This thesis extends the control theory to include these multiple-valued systems by showing the existence of what are called optimum switching zones. These zones predict which of the infinite number of switching curves in a multiple-valued system …

The Design, Construction, And Evaluation Of A Vortex Stabilized Plasma Generator, Ronald Ray Williams

Masters Theses

“This report presents the design, construction, and evaluation of a vortex stabilized arc plasma generation facility operating on argon.

The facility consisted of five basic systems; the plasma genera- tor, the electrical power system, the argon flow system, the cooling system, and instrumentation.

The facility was designed to meet four general requirements; stable arc operation, low electrode deterioration, low cost of construction, and provisions for determination of the operating characteristics and thermal properties of the plasma.

Experimental results obtained in the laboratory agreed well with the design conditions. The rate of energy dissipated in the electric arc varied from 7. …

The Design, Construction, And Calibration Of An Angular Accelerameter., Walter Earl Palm

Masters Theses

"The purpose of this work was to design, construct, and calibrate an angular accelerometer for continuous operation. The design uses four symmetrically placed springs connecting a ring and hub. Strain gages are mounted on the springs in a Wheatstone bridge arrangement. When the entire unit is subjected to an angular acceleration, the ring deflects causing an output voltage. This voltage is proportional to the deflection which is shown to be a function of the angular acceleration. The accelerometer was constructed to operate at frequencies up to 120 cps. The calibration was accomplished by using a simple harmonic motion input"-- Abstract, …

A Preliminary Study Of The Controlled Crystallization Of A Bottle Glass., Narayan M. Sedalia

Masters Theses

The effect of addition of Ti0₂ as a nucleating agent was studied with a bottle glass composition of 74 weight percent Si0₂, l percent Al₂O₃, 5.4 percent Cao, 3.7 percent MgO, 15. 3 percent Na₂O, and 0.6 percent K₂O as a base or original composition. The addition of titanium dioxide ii varied from 3 to 20 weight percent. The composition of this bottle glass was changed by increasing the following ingredients and keeping the other ingredients in the same ratios:

1. Increased 5 weight percent of Al₂O …

Compensator Design For Unity Feedback Systems Using An Analytical Method, Chang-Yu Wu

Masters Theses

“In control systems engineering it is frequently necessary to compensate a fixed plant whose transfer function cannot be changed. Usually the characteristics of the resulting system are established in terms of steady-state and transient performance specifications. Generally it is necessary to insert a compensator which insures stability as well as satisfies the specifications.

In this thesis an analytical method is developed to determine the transfer function of the compensator in order to satisfy the following set of specifications. The fixed system is assumed to contain one non-linearity, saturation. The input to the saturable device is constrained in a statistical …

Compaction Characteristics Of Fine Grained Soils., Lewis Clyburn Sowell

Masters Theses

"The existing theories of compaction of soi Is are reviewed. The effect of varying the compactive effort on dry density, optimum moisture content, and compressive strength for three fine grained soils is investigated. These samples consist of si I ty clay (CL), plastic clay (CH), and loess (ML). The test results indicate that compactive effort has an important effect on the shape of the moisture density curve and that a potential for over compaction increases with a higher plastic index and c l ay content. At water contents above the Standard AASHO optimum value, the compressive strength is not appreciably …

Theoretical Investigation Of Steam Jet Cleaning, Jaswant T. Lotwala

Masters Theses

"Steam cleaning methods are used by industries to remove mass of dirt and grease deposits from machine parts and other surfaces. It is necessary to know the rate at which this mass can be removed from a surface. The present investigation was made to determine this rate of mass removal. The mass transfer rate is influenced by two phenomena; namely, heat transfer and momentum transfer. Both of these were discussed and the results obtained from the analysis were used in determining the total mass transfer rate. The effects of various parameters, such as density and velocity of the cleaning fluid, …

High Order Bang Bang Control System., Shing-Chou Pi

Masters Theses

"The problem undertaken in this thesis is to find a representation of a nonlinear controller to minimize the response time of a limited input plant whose transfer function has N negative real poles. The extension of the phase-space method to automatic control systems described by high-order differential equations with a general high-order input is considered.

The design utilizes a maximum effort controller whose switching time is determined by the concept of switching hypersurfaces of the system in N-dimensional phase space and the concept of a distance function, which is & geometric length between the initial state point and the switching …

Investigations Of The Feasibility Of Transporting Ore In Open-Flumes., Kirtikant R. Sheth

Masters Theses

"Considerable effort has been expended and many data are published on developing the technologies of pipeline transportation and hydraulic hoisting. However, comparatively little information is available on the techniques of hydraulic mining, and nearly none ii is reported on conveying slurries in open flumes. For this reason, the author chose to investigate some of the parameters that influence open-flume transport.

It was found that Durand has assembled the findings of several investigators into a simple mathematical expression which is accepted as a standard for designing slurry pipelines. ·Further investigation by the writer revealed that Durand's formula, with only minor modification, …

The Effect Of A Lubricant On Tool-Workpiece Interface., Kenneth Eugene Spencer

Masters Theses

"The purpose of this study was to compare the effects of cutting fluids and the method of application to an orthogonal cutting process.

The cutting operation was performed on a lathe. The fluids use d were compressed air and a solution of emulsifiable oil and water.

The flooding of the area was produced by directing a copious supply of fluid over the cutting a rea. The directed stream was obtained by pumping the fluid through a small hole drilled into the tool holder, immediately above and behind the tool face, which directed the fluid at the tool-chip interface.

The results …

Anodic Dissolution And Disintegration Of Indium, Thallium, And Indium-Cadmium Solid Solutions And Valency Of The Ions Going Into Solution., Richard Lloyd Martin

Masters Theses

"Indium was found to form only In⁺³ ions when dissolving anodically in aqueous acid solutions. Thallium dissolves anodically in acid solutions giving Tl⁺¹ ions only. The reason why Faraday's law is not being formed is that the anode undergoes partial disintegration producing small metallic particles.

Disintegration of these anodes depends on several factors: the nature and concentration of the corrosive medium, the surface condition of the anode, the current density, and the temperature of the corrosive solution. Disintegration may be due to different mechanisms depending on the nature of the electrolyte" -- Abstract, p. ii

Mass Transfer To Droplets: Effect Of Non-Newtonian Continuous Phase., Hsin Chih Wu

Masters Theses

"Since non-Newtonian fluids are frequently encountered in the chemical and process industries, it is important that the transport processes which are commonly encountered be thoroughly investigated. Although studies of fluid mechanics and heat transfer with these fluids have been reported, virtually no work has been reported in the study of mass transfer. This is particularly true of mass transfer in turbulent flow.

The purpose of this investigation is to study the liquid-liquid mass transfer phenomenon in turbulent flow associated with single droplets in non-Newtonian continuous phases. The results are compared with those obtained in Newtonian systems. The data obtained will …

Velocity And Kinetic Energy Distribution Of A Submerged Jet., Patrick Shepard Couch

Masters Theses

"The velocity distribution in a cylindrically bounded region of water induced by a submerged axisynnnetric jet of water, has been investigated. Velocity profiles at successive levels were constructed. The continuity equation was shown to be only approximately verified by the velocity profiles.

The kinetic energy for each level was computed and given mathematical expression"-- Abstract, p. 2

A Study Of Cation Exchange And Soil Properties, Arthur G. Follett

Masters Theses

“The objective of this investigation is to study the effect of clay content and cation exchange capacity on the liquid and plastic limits of a soil system in the natural, flocculated, and dispersed states. Putnam and Clarksville natural soils found extensively in Missouri and a synthetic soil composed of Kaolin clay and Clarksville fine sand and silt were tested.

The results of the investigation indicate that a general relationship exists between the high cation exchange capacity of a soil and the extreme variances of the liquid and plastic limit values for the flocculated and the dispersed states. The cation exchange …

The Toxic Effects And Fate Of Selected Pesticides In Natural Water., Donald Lee Evans

Masters Theses

"The extensive application of synthetic organic pesticides in the United States has created many problems, particularly with respect to fish life. While a number of investigations have been undertaken to determine the toxicity of several pesticides to various species of fish, a great deal of research work is needed before the problem is completely understood.

The individual toxicities of DDT, BHC, 2.,4-D, and Sevin to western golden shiners were determined by means of the bioassay procedure at a t empera t ure Of 16oc. The four chemicals studied were found to be toxic to the test fish with Median Tolerance …

A Study Of Crystallization Of Synthetic Fluor-Glaucophane Compositions, Kartini Tjokroatmodjo

Masters Theses

"The ability to form a stable glass and the crystallization properties of four compositions close to that of glaucophane, Na₂Mg₃Al₂Si₈O₂₂(OH)₂ studied. Three glasses were compared with a fourth glass containing no fluorine. The crystallization products of all four glasses were examined between the temperature range 600 - 1200°C. The crystallization products of the three fluorine containing glasses were similar, consisting of mica below 1000°C and of mica, fluor-glaucophane, enstatite and forsterite above 1000°C. In the fluorine free glass, enstatite was the only crystalline phase present below 1000°C, however, forsterite …

Estimating Bench Design Parameters For Open-Cut Excavation, Rajni K. Gandhi

Masters Theses

"There are no direct relationships available that provide a basis for bench design of multiple-bench, open-cut earth excavations in competent materials when power shovels are employed. This study was undertaken to determine if mathematical design expressions could be developed when the production rate, material's properties, and equipment operating characteristics were known.

It was found that all bench dimensions were a function of the bench height, which in turn was controlled by the required rate of production. The investigation revealed that suitable relationships could be developed to guide in the control of bank stability, choice of shovel capacity, determination of the …

The Anodic Dissolution And Disintegration Of Gallium And Aluminum And The Initial Valency Of The Ions Entering Aqueous Solutions., Kenneth Anderson Poush

Masters Theses

Gallium dissolved very slowly in dilute acids like HC1, H₂SO₄and HCIO₄. The rate was substantially accelerated if the metal was connected with a platinum electrode in the same solution. From the volume of the hydrogen developed the trivalency of gallium ions going into solution was calculated. This same ionic charge was obtained from coulometric measurements using gallium-amalgam as the anode. The initial ionic charge of aluminum dissolving from an aluminum amalgam anode was evidenced as being plus three by coulometric measurements.

Gallium and aluminum anodes were found to partially disintegrate while the current flowed. …

Optimalization By Peak-Holding, Curtis W. Dodd

Masters Theses

"The problem presented is a study of the peak-holding method of optimalization. This method applies to a system that has an extremum.

After describing how the complete system, consisting of the controller and the controlled system, works; variations in the controller are presented. These variations are changes in the final stage of the controller, the servo. A phase-plane analysis shows how the output of the controlled system varies with its rate of change. Limitations are presented which tell why the system cannot be kept at its peak value at all times. Finally an analog simulation is used to study the …

Real Time Testing With A Time Scaled Analog Computer., Wayne F. Balsman

Masters Theses

"A present limitation to the testing of a physical subsystem within an analog simulation is that the analog computer must compute in real time. If it is necessary to time scale the simulation of the complete system, a physical subsystem of the complete subsystem may not be tested within the simulation. Therefore, a means of changing the time scale of the analog signal is needed to test a physical subsystem within a time scaled analog computer simulation.

In this thesis a means of time conversion by sampling the analog signal at one rate, storing the samples, and reading the samples …

Solid-Phase Welding Of Nodular Iron To Low Carbon Steel., Scott H. Carriere

Masters Theses

“This paper presents an experimental investigation of the possibility of using solid-phase welding to join nodular iron to low carbon steel. Included is a review of available literature on solid-phase welding, tracing its origin from early Egypt to the present day. There was no previously reported work found on the welding of nodular iron to steel.

Experiments were performed to determine what temperature-pressure combination gave the greatest ultimate tensile strength These experiments resulted in the best welds being produced with an end load of 7000 pounds (35.700 psi) on a half inch diameter sample. The majority of these welds proved …