Engineering Commons^™

An Efficiency Analysis Of Underground Haulage In The Tri-State Mining District, Leroy King Wheelock

Masters Theses

"Purpose of Investigation: This study was undertaken to describe and analyze the system of haulage as practiced in mines of the Tri-State District by the Eagle Picher Mining and Smelting Company.

The investigation is concerned with all of the operations involved in moving the broken rock and is composed of three distinct procedures: loading, hauling, and hoisting.

One of the important items in the cost of mining is the movement of ore and waste to the surface for further disposition. Increased efficiency of transportation should introduce lowered production costs.

In this paper the efficiency of the present equipment and the …

Photoelastic Investigation Of Notched Corners In Square Apertures In Flat Plates Subjected To Tension, Lloyd E. Byrd Jr.

Masters Theses

"Photoelastic stress analysis is one of the most effective methods available to the engineer for solving problems of stress distribution. The effect of forces, such as pressure and tension may be studied using a scale model of a structural part. Special transparent models are subjected to forces proportional to those acting on the real object. The stress problem produced in the model indicates the stress distribution through a cross-section of the structural part.

Analysis of the photographic record of the stress analysis pattern provides data with a high degree of accuracy within a relatively short time. In simple cases, this …

The Design Of A Closed-Loop Voltage Regulator For A D-C Generator, Ernest P. Longerich

Masters Theses

"The methods of obtaining voltage regulation for a d-c generator are many, and they vary in complexity according to the requirements of the loads being supplied.

A need for zero voltage regulation is not uncommon in power supplies that are used in laboratory work. It is frequently not enough, however, to have a supply whose steady state regulation is zero; the need may also exist for fast transient response to changes in load.

In general, then, the criteria for excellent voltage-versus-load characteristics of a d-c power supply might be stated as follows:

1. It has zero steady state error.
2. It has …

The Effect Of Impeller Speed And Air-Volume On The Flotation Rate With Respect To Particle Size, William Edward Horst

Masters Theses

"Today the ore being mined is low grade and the mineralization has become very complex. In order to concentrate a complex ore, the requirement of grinding the ore very fine is imposed. The process of flotation was developed to concentrate the finely ground ore particles; however, the finer size fractions of the ore still present a concentrating problem.

The fact has been established that the flotation rate which is the recovery that can be attained during a given time interval varies with particle size. The flotation rate increases with an increase in particle size until the maximum flotation rate is …

X-Ray Studies Of Zirconium Cyanonitride, John T. Ballass

Masters Theses

"The purpose of this research was to study, by means of x-ray and metallographic analysis, a material reported to be zirconium cyanonitride.

The x-ray analysis had a three fold purpose, the determination of the symmetry of the constituents, the number of phases present, and the crystal structure type. Metallography was used to confirm some of the results obtained by x-ray analysis establishing certain definite phase relationships present in the microstructure.

The sample investigated contained three principal elements namely zirconium, nitrogen, and carbon. On the basis of constitution this work is a contribution toward the development of the three component equilibrum …

Temperature Kinetics Of Nitrogen Dioxide-Ammonia Reactions, George Dillender Jr.

Masters Theses

"The purpose of this project was to study the rapid rate of reaction of nitrogen dioxide and ammonia and if possible to determine the mechanism of the reaction.

The author became interested in this project through his interest in rockets, jets, and the types of fuel that are used to propel them.

The prospect of using nitrogen dioxide and ammonia as a possible fuel was the basic reason for the selection of this project.

Very little has been done in the study of the reaction of nitrogen dioxide and ammonia, although the reaction seems to be a simple one.

How …

Rehabilitation Of Land Stripped For Coal, Richard Matthaei

Masters Theses

"The usual connotation of the word rehabilitation as applied to land areas is the restoration of that land to its former efficiency. However, in the spirit of conservation that is essential to our standard of living, the word has begun to have added meaning. In the fullest concept, rehabilitation involves a study of soil characteristics and capabilities, and creation of productive uses of which the land was not capable in its original condition. The true conservationist has an opportunity to make a useful contribution to the future generations of this country. The United States Forestry Service and the United States …

Clipper Amplitude Modulator, Durmuş Öcal

Masters Theses

"An amplitude modulated wave is defined as a wave form in which the amplitude of a sinusoidal signal (carrier) is varied in accordance with a modulating signal whose frequency is much lower than the frequency of the carrier signal. Numerous devices have been found for generating an amplitude modulated wave. In some modulators the amplitude of the carrier is actually varied in accordance with the modulating signal. In other types of modulators the carrier and the modulating signal are simultaneously applied to a nonlinear element or circuit. The output of this non-linear element is a distorted wave containing many frequencies. …

Transfer Function Of The Modified Kramer System, David L. Hillhouse

Masters Theses

"The use of operational mathematics in the solution of engineering problems has grown tremendously in the last two decades, particularly during the last war. This has come about because of the facility with which problems which would be almost impossibly complicated or tedious to solve by classical methods can be solved using operational calculus.

The operational calculus, particularly the Laplace transform method, has become especially useful in the field of servomechanisms and controls. Here the constantly increasing complexity of systems used has resulted in very high order differential equations. The fact that the Laplace transform method makes it possible to …

Direct Reduction Of Zinc Sulfide Under Vacuum, Merritt E. Langston

Masters Theses

"The present work is a continuation of the previous investigations of Gross and Warrington and Liu in which the effect of various reducing agents on the vacuum reduction of zinc sulfide was studied. The author became interested in this topic while reading the papers by these investigators in which they recommended that further work be performed in an attempt to prevent zinc sulfide from distilling over during reduction, thereby contaminating the zinc condensate. The original plan was to perform a few runs for the purpose of duplicating the results that were reported by Liu, and from this point carry on …

Serrated Wire For Welded Wire Fabric, Homer F. Thompson

Masters Theses

"The Wire Reinforcement Institute, Inc., is concerned, primarily, with gathering data and technical information to substantiate the following:

1. That welded wire fabric, when used as a reinforcement in concrete, distributes the stresses throughout the concrete slab, as has been maintained by engineers during the past 40 years.
2. That welded wire fabric provides adequate crack control within the working limits of the fabric.

In order to efficiently accomplish Objectives 1 and 2 above, we wish to establish:

1. The safe working stress that we can safely recommend for welded wire fabric -- both in bond and tension.
2. The proper spacing of longitudinal …

Experimental Techniques In The Kinetic Study Of Rapid Gas Phase Reactions, William Dean Burch

Masters Theses

“In recent years chemical kinetics has assumed a prominent role in Chemical Engineering studies. While a considerable amount of data is available in the general field, very little is available for rapid gas phase reactions, i. e., reactions that are completed in from a few milliseconds up to a few seconds. Recently techniques have been developed for the measurement of the rate of such reactions.

With the advent of jet aircraft, the study of very rapid oxidation reactions becomes imperative. One such reaction that presents itself in this category is the oxidation of anhydrous ammonia in the vapor state by …

Dissociation And Relative Stability Of Sodium Fluotitanate, Walter L. Gage

Masters Theses

"Titanium is urgently needed in the armament industry especially as a substitute for 18-8 stainless steel. There would be an almost inexhaustible supply of ores of titanium if high-purity titanium metal could be produced economically in large quantities. The use of titanium would permit much of the scarce nickel and chromium to be made available for other important uses.

It has been found by H. C. Kawecki and E. J. Bielecki that high-purity Na₂TiF₆, K₂TiF₆, and (NH4)₂TiF₆ can be produced from iron-bearing titaniferous raw material, ilmenite ores, or a …

Activation Energy For Recrystallization In Rolled Silver, Krishan Kumar Tangri

Masters Theses

"In several metals the process of recrystallization is accompanied by a change in the orientation of the recrystallized material with respect to the cold rolled material. If the change is sufficiently large, the changing position of the crystals can be determined by measuring the change in the intensity of the characteristic Bragg-reflection with a Geiger counter x-ray spectrometer. Recent determinations of the activation energies of copper and a 50/50 iron-nickel alloy have been made by using this x-ray technique. Both of these metals show a decided shift in the orientation as the material is recrystallized.

Silver was examined to find …

Analysis Of Magnetic Amplifiers Based On Assumed Analytical Expressions Of B-H Characteristics, Wiley Talley Ruhl

Masters Theses

"In the past 10 years, magnetic amplifiers have received much attention in many different fields of engineering. Although the principles of this amplifier have been known since 1915, it has been forced into the background by the development of the vacuum tube amplifier, the need of better core material and better dry disk rectifiers.

The basic magnetic amplifier, or saturable reactor, is nothing more than an iron core reactance coil whose a-c impedance is controlled by a d-c premagnetization of the core. This d-c premagnetization may be obtained in a number of ways, the simplest of which is a separate …

The Application And Utilization Of Mining Models For Instruction And Display, William M. Shepard

Masters Theses

"The subject of the utilization of mine models for instruction and display at institutions offering courses in mining engineering has not been widely discussed in the literature. The value of models as visual aids in teaching has long been recognized, and they have been extensively employed by some institutions and by some instructors. However, the writer believes that a wider range of types of models are suitable for instruction purposes than have been employed in the past, and that mining models, properly arranged and adequately labelled, may be used in displays to give both the layman and the beginning student …

Porosity-Permeability Relationships Of Unconsolidated Sands, Robert Marchel Ponder

Masters Theses

"Unconsolidated sand reservoirs containing oil and gas present difficult problems to the petroleum engineer. Among these problems is that of the determination of the reservoir porosity to facilitate oil and gas reserve and evaluation calculations.

This problem is especially difficult because, to the author's knowledge, no method has been devised to obtain a core sample of the unconsolidated sand that retains the same porosity and permeability characteristics in the laboratory as it had underground. As a result, the petroleum engineer must rely upon empirical methods of calculating the reservoir porosity when the sand is not consolidated.

Many investigators have attempted …

An Experimental Study Of The Effect Upon The Current Distribution And Radiation Pattern Of Crossbars On Yagi Receiving Antennas, Gerald F. Sinnamon

Masters Theses

"The development and widespread use of radar systems in World War 11, and the post-war television boom, has brought about a large amount of investigation in antenna arrays. One of the types of antennas commonly used on radar systems during the early part of the war, and one which finds wide usage today as a television receiving antenna, is the well known Yagi antenna...

Since television antennas are usually mounted out of doors, the antenna must be made mechanically strong to prevent whipping or twisting due to wind, and to prevent sagging due to icing or to its own weight. …

A Study Of The Effect Of Jointing On The Blasting Of Granite, Graniteville, Missouri, Avery Ala Drake

Masters Theses

"Purpose of investigation: The purpose of this investigation is to attempt to determine the influence that joints exert upon the blasting of granite and if joints are induced by blasting. The problem grew out of an explosive evaluation project that was conducted by the Mining Department, Missouri School of Mines. In late May 1950, the project was moved into the granite area near Graniteville, Missouri. It became apparent upon study of this area that the jointing would have certain effects upon the results obtained. Dr. J. D. Forrester, Chairman, Department of Mining Engineering, Missouri School of Mines, Rolla, Missouri, suggested …

A Study Of Size Of Diamonds In Diamond Drilling, Robert J. M. Miller

Masters Theses

" ''A Study of Size of Diamonds in Diamond Drilling' is the research problem which will be discussed in this treatise.

The author's interest in the effect of size of diamonds was created by Mr. R. D. Longyear of the E. J. Longyear Company of Minneapolis, Minnesota. Mr. Longyear, when asked for suggestions for a research problem concerning diamond drilling suggested, among other things, that there was a need for further work on the factor of size of stones. After extensive reading and reviewing, the author learned that many investigators had recognized changes in results attributable to changes in size …

An Investigation As To The Uses Of The Topographic Map And Improvements Desired By The General Public, George O. Boeckman

Masters Theses

"The demand for topographic maps from hunters, fishermen, vacationers, professional engineers etc, has been increasing with each passing year. In 1940 people bought some 700,000 copies of topographic maps. In 1946 sales had jumped to well over 2,000,000 copies. Civilian use of these maps by veterans has contributed substantially to the tremendous expansion of demand for maps since World War II. In recent years, the quality of topographic maps has been greatly improved by refinements in methods and by the use of aerial photography in map compilation. This advancement, and an ever-increasing demand from engineers, geologists, and many others for …

Autographic Determination Of Thermally-Induced Linear Changes In Ceramic Bodies, William Dean Mckee Jr.

Masters Theses

"The determination of changes in length of ceramic compositions as a function of temperature is frequently required in ceramic research and testing. With the use of an observer, excellent means are available for determination of changes in length over moderate ranges of temperature. However, the extended period required for some tests makes desirable the automatic recording of length change as a function of temperature.

There has been in use in the Ceramic Engineering Department a furnace arranged for determination of length changes; this furnace, shown in Figure 1, is so arranged that change in sample length causes linear displacement of …

An Economic Study Of The "C" Factor, David Hunter Robinson

Masters Theses

"After due consideration of the facts and hypothetical conditions enumerated herein, it was decided that this work would be devoted to developing a means of determining the most economical “C” factor to be used; one that will be consistent with ease of operating the plotting machine, the required accuracy of the finished compilation and economy. In other words, the highest value of the "C" factor that will produce results within the accuracy requirements under normal operating procedures.

As a secondary project, it was decided to plot a curve using points determined by analyzing a series of spot readings made at …

Hydrology Of Small Drainage Areas, James Kinchen Searcy

Masters Theses

"Realizing the need for data on small drainage areas the Missouri Highway Commission in 1947 began a cooperative project with the Water Resources Division of the United States Geological Survey which includes the establishment of small area gaging stations and recording rain gages.

The purpose of this investigation is to study some of the data collected in the few years of operation of these small area stations with the aim of testing some of the hydrologic tools useful in the study of larger drainage basins to determine their applicability on small drainage basins. The relationship between the runoff of large …

An Investigation Of End-Anchorage And Performance Of Sr-4 Strain Gages On A Prestressed Concrete Beam, Howard W. Nunez Jr.

Masters Theses

"In recent years there has been brought to the attention of engineers and architects a new medium of construction---prestressed concrete. Reinforced concrete has long been recognized as a satisfactory material for use in the construction of buildings, bridges, highways, tanks and other structures. However, most concrete designers will concede that this material has many drawbacks. For instance, in a simple beam of rectangular cross-section, roughly only one half or the concrete is relied on to resist compressive forces. The tensile strength of the concrete is considered to be zero, and steel bars or rods must be inserted to carry the …

The Effect Of Grain Size On Shearing Strength Of Sand, Keyhan Samimi

Masters Theses

"The object of this study is to determine experimentally the effect of definite grain size on the shearing characteristics of sandy soils. As it will be discussed in detail under the article - The Mechanics of Shear, the shearing characteristics of sandy soils depends on many factors such as grain size and shape, soil structure and relative density, the water content of soil. An attempt is made throughout the entire investigation to determine the effect of definite grain size on the shearing value and the angle of internal friction under the dry and saturated conditions. Furthermore, the results of shear …

Design Of A Galvanometer To Be Placed Within A Tubular Antenna For The Purpose Of Measuring Antenna Current Distribution, Ferdinand Henry Mullersman

Masters Theses

"The object of this paper is to design such a galvanometer for application to cylindrical UHF antennas and to discuss the procedure involving its use. The galvanometer will then be placed inside a completely isolated parasitic antenna and the distribution of current along the antenna will be measured"--Introduction, page 5.

A Comparison Of The Real Price And Market Price Of Some Common Metals, Kon-Hock Khaw

Masters Theses

"A number of complex factors influence the fluctuation of the price of a metal. In this investigation, the writer is concerned with the influence of the purchasing power of the dollar and, therefore the difference between the value (real price) and market price of nine metals. That is, this is a study of metal prices and their corresponding values. No attempt is made to analyze the supply and demand of the past or the future, except as they are expressed by their function -- price.

To aid in the comparison, a set of index numbers for metals is compiled and …

The Equilibrium Distribution Of Moisture Between Freon-12 And Selected Commercial Desiccants., Arnold Jarvis Gully

LSU Historical Dissertations and Theses

No abstract provided.

Comparative Refining Methods Of A Cane Sugar Solution., Pramod Lal Sarma

LSU Historical Dissertations and Theses

No abstract provided.