Digital Commons Network^™

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. …

Charge Transfer Between H ˉIons And O₂ Molecules And D ˉIons And O₂ Molecules In The Ground State., Paul Edgar Chaplin

Masters Theses

"This thesis has been prepared in the style utilized by the Physical Review A. Pages 1-17 will be presented for publication in that journal. Appendices I, II, III, and IV have been added for purposes normal to thesis writing"-- Abstract, p. ii

Noise Power Estimation Based On Data Of Finite Sample Size., John Michael Koly

Masters Theses

"The method of z-transforms is used to derive the error performance of an average noise power estimator that utilizes data of finite sample size. Rectangular and trapezoidal integrators are employed by the estimator. Theoretical performance of each integrator is derived as a function of the number of samples utilized to form the estimate"-- Abstract, p. ii

Application Of An Inverse Heat Conduction Technique To A Simulated Injection Mold., Noel Joy Rytter

Masters Theses

"An analytical model was constructed to investigate the heat transfer in an injection mold for which the temperature was controlled by a special mold heating-cooling process. Several techniques were used to test the validity and accuracy of the analytical model of the mold and to explain some singularities that occurred. It was determined that the thickness of the plastic part being molded is the primary factor affecting the minimum cycle time for the molding operation. Also, abrupt changes in temperature on the molding surfaces are very difficult to obtain because this requires drastic temperature changes for the working fluid that …

Development Of A Four Channel Cloud Nucleus Spectrometer., Larry Allan Brunner

Masters Theses

"A four-channel vertical flow thermal diffusion chamber for use as a cloud nucleus counter is described. The droplets in each channel are photographically counted. The instrument provides about 20 seconds of available growth time, which enables better distinction of active droplets than does ii the conventional horizontal chamber. Droplet growth calculations show that the uncertainty in droplet count due to limited available growth time is negligible for supersaturations above 0.3% but increases rapidly as the supersaturation is lowered below 0.3%. For example, at 0.1% supersaturation, the uncertainty is -27% to +38% in the drop count. The possible error in supersaturation …

Graph Model Analysis Of Computer Structures, Ömür Taşar

Masters Theses

"Graph theory is applicable to the solving of problems in nearly every field of scientific study. The purpose of this thesis is to consider its applications in representing and analyzing digital computers. Fundamental graph theory definitions, the types and the properties of the directed graphs, the matrix representation, and several reduction techniques are discussed. The blocking gate method for diagnosing computer systems is described and applied to the Scientific Control Corporation (SCC) 650 for its fault-diagnosis.

Microprogramming has been a significant trend in hardware and software designs of computers. Microprogrammed computers are discussed in comparison to conventional computers. A general …

Computer Analysis Of 3-Phase Induction Motor Operation On An Open-Delta Distribution System, S. Clark Seematter

Masters Theses

"Open-delta/open-delta and open-wye/open-delta transformer banks are often used as an economic means of supplying simultaneous single-phase and 3-phase loads. If the 3-phase load is an induction motor and if these banks are used, the inherent voltage unbalance causes increased losses and uneven heating that may lead to motor failure. Two previously published theories are used to predict motor heating that is caused by the unbalanced voltages and the motor derating that is necessary to prevent insulation failure"--Abstract, page ii.

Local Buckling Of Cold-Formed Steel Structural Members Having Initially Curved Compression Elements, William M. Mckinney

Masters Theses

"A comprehensive investigation of the effect of initial deviation from flatness on buckling stress and post-buckling strength of compression elements in structural plate members is presented. The study of stiffened and unstiffened elements expands the scope of elastic stability for initially curved plates. Finite element techniques were utilized for the study of unstiffened elements"--Abstract, page ii.

Waste Heat Utilization From A Direct Cycle High Temperature Gas Cooled Nuclear Reactor For District Heating And Air Conditioning, John Joseph Blase

Masters Theses

"An analysis was conducted to determine the economic as well as technical feasibility of waste heat utilization from the proposed direct cycle high temperature gas cooled nuclear reactor, as designed by the General Atomic Company.

The rejected heat from this system is at considerably higher temperatures than those normally encountered in conventional steam-electric Rankine cycles. By taking advantage of these higher rejection temperatures, heat was translated into energy available to a district heating and air conditioning service. The transportation of this energy was considered to be in the form of heated and chilled water.

A refrigeration capacity on the order …

Diurnal Solar Heating And Cooling Of A Water Reservoir, Stephen Patrick Lepper

Masters Theses

"The transient diurnal heating of a water reservoir by solar radiation; and its cooling by surface convection, evaporation, and radiation emission was analytically modeled. The directional and spectral properties of the incident solar radiation, the air-water interface, and the selective attenuation of radiant energy by the water were properly included in the analysis. The diurnal vertical temperature distribution was predicted by numerically solving the energy equation using a finite difference technique. It was determined that the surface boundary conditions and the selective absorption of radiant energy by the water strongly influence the thermal stratification of stagnant water.

The diurnal compensating …

Metal Salt Catalyzed Carbenoids The Catalysts In Trialkyl Phosphite Copper (I) Complex Catalyzed Decomposition Of Diazo Compounds, Nguyen Van Thinh

Masters Theses

"Partial rate data, asymmetric induction studies, interrupted experiments and additives studies indicate that copper(I) salt-phosphite complexes are destroyed during the course of reactions with dimethyl diazomalonate (1) and ethyl diazoacetate (2). All evidence is consistent with the copper(I) being oxidized to copper(II) and copper(0) being oxidized by impurities in the olefin which most probably are hydroperoxides.

Several new copper(I) salt-phosphite complexes were prepared and examined but none proved as effective for decomposing (1) as copper(II) bis acetylacetonate.

The utility of the copper (I) chloride-trimethyl phosphite complex for decomposing (1) is a function of the means of preparation. The three general …

A Multiple-Plan Evaluation Model For Small Ungauged Watersheds, James R. Dexter

Masters Theses

A computer solution model is proposed for simulation of the effect of alternative measures for flood damage reduction. The goal of the model is to optimize the value of an objective function which will maximize the amount of net benefits returned by the project. The evaluation includes unit hydrograph synthesis, direct runoff construction, computation of average annual damages, and optimization of an objective function. A test application of the model is made on a small community affected by floods from a small ungauged stream"--Abstract, page iii.

A Numerical Study Of Ordinary Differential Equations With Periodic Coefficients, Richard Bruce Schuessler

Masters Theses

"In this thesis a method for solving ordinary differential equations with periodic coefficients is derived. In addition, by utilization of Floquet theory, a theorem is given by which it is possible to determine the stability of the zero solution. Error bounds are given for the method and for the two dimensional case bounds are given for the error in the eigenvalues. Several numerical examples are given to illustrate the method"--Abstract, page ii.

A Geohydrologic Study Of The St. Francois County Regional Sanitary Landfill., Kent David Gastreich

Masters Theses

"The St. Francois County Sanitary Landfill is a 503.8-acre site located 1n the Old Lead Belt area of southeast Missouri. The landfill, which was opened in July 1973., is being operated by the non-profit St. Francois County Environmental Corporation. The site is largely covered by up to 80 feet of tailings finely ground dolomite of the lower Bonne Terre Formation., wh1ch are a product of decades of lead mining and milling at the Deslodge, Missouri, Mine. The landfill 1s surrounded on three sides by the Big River. Approximately 36,000 people are being served by the landfill which takes in about …

Characterization And Pollutional Contribution Of Stormwater Runoff From A Small Urban Area., John Lamb Wendleton

Masters Theses

"Stormwater runoff from urban areas has long been recognized as a pollutional source, however, only in the last decade has there been an extensive eff ort to measure its effect on receiving lakes and streams. Because runoff from small urban communities has received limited attention, this investigation was undertaken to determine the quality and pollutional contribution of stormwater runoff from a small urban area. The specific objectives of the study were: to characterize and correlate runoff quality with land use activity and to qualitatively and quantitatively measure the pollutants discharged with respect to time.

Runoff from 3 test watersheds in …

An Investigation Of The Vertical Distribution Of Sulfur Forms In Surface Mine Spoils, Henry County, Missouri, Walter Carter Von Demfange Jr.

Masters Theses

"Samples of material in the spoil banks left by surface coal mining operations in Henry County Missouri were taken from various depths and preserved to prevent further oxidation of the pyrite in the samples. Quantitative determinations were then made for sulfate and sulfide sulfur. It was shown that near the surface the sulfide sulfur concentrations were much lower than those at greater depth while sulfate concentrations were higher near the surface than at depth. Since this is probably the effect of years of oxidation of the pyrite, it can be used to show at what depth the pyrite is being …

Bidding And Negotiation Of Government Funded Contracts With Inflationary Considerations., David Thurman Hearst

Masters Theses

"The traditional government contract type has played an important role in the economy of the United States. In its most used type, that of fixed price, it represents a stabilizing factor in the cycles of the business world. However, recently this type of contract has been affected by the nation's most recent plague, double-digit inflation.

Inflation attacks almost all phases of stability in the economy and in contract negotiations and bidding techniques. It erodes the monetary unit of the economy, distorts forecasting models, and creates potential ruin for contractors due to uncertainty in costs.

Research pertaining to government funded contracts …

A Transcription And Analysis Of A Seventeenth-Century Bolognese Trumpet Sonata, Steven Bradfield

Masters Theses

No abstract provided.

The Effects Of Dental Hygiene Information And Consequation On Plaque Control, Janel R. Warner

Masters Theses

The research described in the present paper is based upon a parsimonious analysis of behavior which utilizes principles that have been empirically determined. These principles as discussed by Ullmann and Krasner (1966) and Ulrich, Stachnik, and Mabry (1966) have suggested the wide applicability of behavior modification techniques, not only with animals, but with human subjects in diverse settings. One setting that has previously been left unexplored by proponents of behavior modification, which promises to be an area of growing concern, is that of dental hygiene.

The problem that the present study concerns itself with is educating children in the· correct …

A Comprehensive Survey, Index, And Listing Of Community Agency Resources Currently Providing Services To The Residents Of Charlevoix And Emmet Counties, Ronald L. Moore

Masters Theses

No abstract provided.

Behavioral Contrast After Errorless Discrimination Learning As A Function Of Non-Contingent Shock, James H. Kaye

Masters Theses

No abstract provided.

Predicting Success In Instrumental Music, Charles A. Baughman

Masters Theses

This paper represents a study of the predictability of several types of music tests given to the fourth grade students in East Grand Rapids, Michigan. The tests studied were the "Selmer Music Guidance Survey," a Teacher's Evaluation, and an investigatordeveloped self-concept test. The study showed that the correlation coefficient between the self-concept test and the achievement level of the students at the time of the study was the highest. The correlation coefficient between the "Selmer Music Guidance Survey" and the achievement level was the lowest. There were 595 students surveyed in the study, which was conducted between the years 1968 …

A Study Of The Relationship Between Perspective Ability And Map Conceptualization In Elementary School Children, Russell L. Cobb

Masters Theses

No abstract provided.

A Survey Of Graduate Students In Two Library Schools To Determine The Factors Considered Of Primary Importance In The Selection Of A Library School, Katherine V. Shaw

Masters Theses

No abstract provided.

Peer Recording And Its Effects On Observer Behavior, Ronald J. Gumm

Masters Theses

No abstract provided.

The Changing Role Of The Priest From Facilitator Of Escape Responding To Mediator Of Positive Reinforcement, Robert J. Crackel

Masters Theses

No abstract provided.

Binding Of Aminoacyl-Trna To Bacterial Ribosomes, Somesh Datt Sharma

Masters Theses

No abstract provided.

Petrogenetic And Trend Surface Analysis Of Hell Canyon Pluton, Montana, William M. Johanns

Masters Theses

I. Introduction

The purpose of this study is to ascertain the petrogensis of the Hell Canyon pluton through the use of standard petrographic techniques and three dimensional mineralogical variability trends. It is intended that this study will provide additional information to the ongoing investigations of the Boulder batholith sequence, of which this intrusion is a part.

The Boulder batholith is located in the Southeastern part of the Northern Rocky Mountains physiographic province in southwestern Montana. This province is typified by numerous rugged mountain ranges of which there are two distinct types. The Idahotype( Rocky Mountain Association of Geologists, 1972) mountains, …

A Floral Survey Of The Lake Michigan College- Ross Property, Van Buren County, Michigan, William Monroe Knott

Masters Theses

No abstract provided.

Differentiating Phonemic And Spectrografhic Speech Characteristics Of Daf Susceptibility, Peter J. Alfonso

Masters Theses

No abstract provided.