Engineering Commons^™

Phase Equilibria Near The Solidus Temperature For Iron-Rich Fe-Cu-C Alloys., Kenneth L. Metz Jr.

Masters Theses

"The effect of copper on the solidification temperature of graphite-saturated iron-rich alloys was determined with the use of cooling curves. The ternary invariant temperature for the alloy was found to be 1172°c with the use of heating curves. At 1172°c, graphite, austenite, an iron rich liquid, and a copper-rich liquid are in equilibrium. The composition of the metallic phases was determined by weight gain, chemical analysis, and the electron microprobe. In addition, the composition of the iron-rich liquid was calculated from thermodynamic data. Isothermal sections of the iron-rich corner of the system were constructed for several temperatures in the range …

Experimental Study Of Electron Density And Confinement Time In An Electrostatically-Plugged Cusp Device Using A Microwave Interferometer, Robert Louis Hayward

Masters Theses

"The average electron density and electron confinement time in an electrostatically plugged magnetic spindle cusp device are studied using a 20 GHz microwave interferometer. The results are compared with the predictions from approximate theoretical equations. With a magnetic induction in the point cusp of 5000 Gauss, a plasma is produced by injecting a 5 mA, 500 eV electron beam into hydrogen gas at 10^-5 Torr. The measured electron density is 2 x 10^-10 cm^-3 and the measured confinement time is 80 ysec, which agree to within a factor of two with values predicted by theory"--Abstract, page ii.

A Parametric Investigation Of The Validity Of 1/25 Scale Automobile Aerodynamic Testing., Marvin Eugene Doberenz

Masters Theses

"Wind tunnel tests have been performed measuring the aerodynamic forces and underbody boundary layer profiles for 1/25 scale models. The trends of the force coefficients with Reynolds number, the underbody boundary layer profiles, and the influence of the ground plane boundary layer on the force coefficients of small-scale models has been shown to be similar with previous results from larger models. This study has shown the usefulness of small-scale models for parametric studies of automobile aerodynamics. The agreement of the data with previous results, also supports the possih1lity o f a method of correction for boundary layer growth on fixed …

A Design Of A High-Voltage Ionization Test Chamber., Jorge Anibal Chiriboga

Masters Theses

"The purpose of this thesis was the design and construction of a test ionization chamber which can be used in the teaching and research of several phenomena involving electrical breakdown of gaseous insulation materials.

Principal electrical discharge laws and effects, as well as their performance, are discussed as bases upon which the chamber was designed. The chamber presents the necessary characteristics for being used as a "multi-purpose" test chamber; in other words, it has the conditions for being used in the study of many electrical discharge phenomena"-- Abstract, p. ii

A Method Of Predicting The Economic Effects Of Highways In Undeveloped Countries., Mohamed Magzoub Abdallah

Masters Theses

"This paper reviews the findings of the socio-economic impact studies pertaining to land-use changes. An attempt is made to explain, through land-use studies, the relationship between the past and future development of the City of Rolla, Missouri, and the system of highways serving the city, The relationship between land-use changes, expressed in active units rather than areas, and the level of activity related to those changes, rep resented by 0-D traffic volumes, is studied for Rolla and the difference in the behavior of this relationship in undeveloped countries is discussed"-- Abstract, p. ii

A Method For Verifying The Kalman Conjecture., Charles Edward Connelly

Masters Theses

"The Kalman and Aizerman conjectures are of value because, if true, they allow the replacement of a nonlinear stability problem by an equivalent linear stability problem. However, the conjectures are not true in general. This thesis presents a method for verifying the Kalman conjecture. A theorem is also presented which extends the usefulness of the method and allows several very general results to be obtained. The method is based on an off-axis circle criterion of Cho and Narendra and a consideration of the curvature of the Nyquist locus of the transfer f unction. A table is included which summarizes the …

A Master Data Bank In Power Systems., Nittaya Hokierti

Masters Theses

"A Master Data Bank (MDB) is used to prepare the data sets of large power system networks for later study. The MDB program has been developed to be compatible with data and formats used in load flow and short circuit studies. The MDB can store up to six sets of base case data. Magnetic disk storage is used as the storage medium to obtain adequate data storage and faster access to the data. The size of storage can be expanded by modification of statements in the MDB source program and job control statements. The data sets in the MDB can …

Reliability Analysis Of The University Of Missouri--Rolla Reactor, Jimmy Dale Schottel

Masters Theses

"The reliability of Nuclear Installations is becoming an important area of research. In this report an approach to reliability analysis was made. The actual failure data was utilized to predict theoretical failure distributions. These distributions were then used to determine future reliability of components, subsystems and system"--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

Design Of An Auxiliary Indicator For A Fighter Aircraft., Jack L. Kubicek

Masters Theses

"The auxiliary indicator discussed in this thesis is the unit which processes signal information for a radar display indicator. The indicator provides system information to a fighter pilot in an easy to read and uncluttered manner.

The indicator displays symbols, target and advisory information for the pilot. The symbols and target information are displayed on a direct view storage tube (DVST), while pilot advisory information is displayed by means of indicator lights located around the perimeter of the display.

This thesis describes the original steps of development, starting with the original consideration of the problem and possible methods for solving …

Possible Damage Mechanism In Dresden 2 Class Boiling Water Reactor Fuel, Donald Lee Moffett

Masters Theses

"A thermal hydraulic analysis of a typical hot channel of a Dresden 2 class boiling water reactor is studied for possible severe local overheating. The COBRA-II thermal hydraulic analysis code is modified to include critical heat flux calculations for each subchannel. The effects of flow distribution, inlet mass velocity variations, dimensional tolerances, enrichment variations, and input parameters are examined in detail. Bulk channel results are in good agreement with the published data, but the assembly wall side of the corner fuel rod has a minimum critical heat flux ratio of less than unity for a number of the situations examined. …

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 …

Two Dimensional Radiant Interchange Between Two Isothermal Semi-Infinite Parallel Strips., Stanley Earl Mckinney

Masters Theses

"Four straight forward solution methods were used to determine the two-dimensional variation of the radiosity on two identical constant temperature, gray, semi-infinite parallel strips. Physical convergence parameters were developed for the one-dimensional case and extended to two dimensions. A study using these parameters was undertaken to identify the preferable method. The solutions obtained with this "best method" agree well with the one-dimensional solutions. The error is estimated to be less than one percent" -- Abstract, p. ii

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 …

A Study Of The Feasibility In Obtaining The Kinetics Of Various Ordering Phenomena Of The Iron Aluminum System Utilizing The Mössbauer Effect, Lloyd Rollan Chapman

Masters Theses

"The determination of the kinetics of ordering for various ordering phenomena of the Iron-Aluminum system utilizing exclusively the Mössbauer effect technique is shown to be infeasible for all but a highly restrictive consideration from experimental as well as theoretical evidence. Also, the possible use of the Mössbauer effect for the analysis of other ordered systems is discussed.

An alternative method for the acquisition of the needed information utilizing diffraction and Mossbauer techniques is presented recognizing the need for a computer fitting analysis of the complex Mössbauer effect spectra. However, at this stage of investigation, no experimental work has been performed …

The Effects Of Washout In Polydispersed Metalic Aerosols, Jerry N. Burford

Masters Theses

"Experimental Collection Efficiencies are presented for drops of approximately 0.1cm radius falling through aluminium, magnesium and molybdenum oxide polydispersed aerosols. The experimentation was conducted in two identical cylindrical chambers, one being used for aerosol washout, and the other for allowing the aerosol to decay normally. The Collection Efficiency data were thus determined by comparing the aerosol concentration changes in the two chambers. The rather strong effects that induced micro-turbulence and relative humidity have on aerosol collection and aerosol decay were observed and are discussed"--Abstract, page ii.

Detection Of Impurities In Zinc Sulfate Electrolytes By Cyclic Voltammetry Techniques., Bruce Alan Lamping

Masters Theses

"A cyclic voltammetric technique has been developed for quantitatively detecting the presence of active chemical species present in zinc sulfate electrolytes. The experimental apparatus consisted of a pyrex "H" cell, an Al cathode encased in a Teflon holder, a carbon anode and a mercurous sulfate reference electrode. Voltammograms were obtained from industrial, purified neutral leach solution (Cominco Ltd., Trail, B.C.) acidified to give a final concentration of 0.77 M Zn⁺⁺, 1 M H₂SO₄. The polarization curves were then evaluated and used as a reference standard to compare with results obtained when various organic and …

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

A Study Of Some Heuristic Models For Predicting The Reflection From Spherical Surfaces., Bruce Wayne Rau

Masters Theses

"Four heuristic models' available for predicting the behavior or radiation Non regularly reflected from spherical surfaces have been studied. The four models include: the classical Lambert, the s-factor as deduced by Look, the Lommel-Seeliger, and the Euler's approach. Because each of these analyses was deduced for flat plate geometry, it was first necessary to integrate these flat plate expressions over the surface of a sphere to develop appropriate expressions for the power rejected from the surface of a sphere based upon e ach of the above theories. As an integral part of this investigation, various basic quantities were listed (i. …

Data Acquisition And Analysis System For Computer Modal Analysis Of Automotive Exhaust Emissions., Edward Leroy Mabie Jr.

Masters Theses

"A data acquisition and reduction method for modal analysis of undiluted automotive exhaust emissions is presented. 'The procedure on which this method is based ·wa.s developed and presented in a. paper by Donald L. Stivender, in 1971, entitled, "Development of a Fuel-Based Emission Measurement Procedure." This method is presented as a. viable a.1ternative to the diluted constant volume sample by bag collection technique specified in the federal test procedure for emissions from light duty vehicles.

The instrumentation used for the acquisition of data was the type normally used for automotive emission studies. The four instruments used for exhaust gas analysis …

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 …

Minorities Are Not Prepared For Accepting Jobs In The Petroleum And Petrochemical Industries., Freddie Lorace Thompson

Masters Theses

"A survey has been made from nine petroleum and petrochemical companies in the Houston area to get recommendations on the training required for minorities to secure jobs and advance in these industries. Information gathered through this survey consist of the following; (1) recommendations on careers minorities should concentrate their training to secure jobs in these industries; (2) the demand for qualified technical minority graduates far exceeds the supply; (3) a vehicle whereby minorities can be trained and inducted into the petroleum and petrochemical industries; and (4) the companies surveyed are putting forth an honest effort to increase their job mix …

Effect Of Sweeping Sinusoidal Excitation On Nonlinear Dynamic Systems., Md. Mosharraf Hossain

Masters Theses

"The response of viscous damped, cubic spring systems to excitations having exponentially varying frequency cannot be written in a closed form. This report summarizes a numerical investigation of hardening and softening cubic systems influenced by these excitations and provides information concerning the effects of varying viscous damping, system nonlinearity, and excitation sweep rate on system behavior near resonance. Results are reported in terms of maximum response attained during sweeping and the frequency at which maximum response occurs.

It has been found that if hardening cubic systems are subjected to sweeping excitations wherein the frequency sweeps down through resonance, the maximum …

Propane-Carbon Dioxide And Propylene-Carbon Dioxide Mixture Adsorption In 5a Molecular Sieves., Bui Van Hong

Masters Theses

"Measurements of the adsorption on SA molecular sieves have established that at 1 atmosphere and 24.0°c, both systems, propane-carbon dioxide and propylene-carbon dioxide, form ideal solution adsorbed phases. Total mass adsorbed ranges from 112 to 207 milligrams/gram sorbent for propane-carbon dioxide and from 130 to 207 milligrams/gram sorbent for propylene-carbon dioxide"-- Abstract, p. ii

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 …

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 …

The Geology And Hydrogeology Of The New Lead Belt, Missouri, Charles Scott Fletcher

Masters Theses

"In order to analyze the effects of pumping groundwater from underground lead mines upon present groundwater resources of the New Lead Belt area, the geology and hydrogeology of that area must first be determined. The primary method of investigation of this analysis was interpretation of ecologic and hydrogeologic data taken from water well logs and mineral exploration well logs, with supplemental information supplied by published and unpublished literature sources. From all these sources of data, structural contour maps of the Precambrian erosional surface; the tops of the Lamotte, Bonneterre, and Davis Formations; isopachous maps of the Davis and the Lamotte/Bonneterre …

An Economical-Digital Interface For Multiplex Recording Of Analog Signals, Samuel Knoles George

Masters Theses

"In measuring and evaluating performance of an automobile and driver combination it is necessary to record data from the vehicle and driver while both are in the field.

The University of Missouri - Rolla Transportation Research Program performs this type of evaluation. The present method of recording data in the field is with a large, bulky, and somewhat fragile strip chart recorder.

The digital recording interface described in this paper is designed to permit replacement of the strip chart recorder with an audio tape recorder. The interface will allow simultaneous recording of two analog channels which may be reproduced as …

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.

2.5 Ampere Dc Solid State Power Controller, John Anthony Gilbert

Masters Theses

"The 2.5 Ampere DC Power Controller presented in this paper is a device which combines the properties of both relays and circuit breakers solely by means of solid state circuitry to perform the power functions that (1) provide DC power to electrical loads by means of power transistor switching, and (2) provide electrical protection by generating trip out characteristics similar to those of thermal circuit breakers. Furthermore, the control of this device is completely computer compatible, i.e., it is commandable from digital logic levels.

The text of this report discusses the requirements, specifications, and design of this power controller. In …