Physical Sciences and Mathematics Commons^™

Petrology And Mineralogy Of The "Old Workings Area," El Salvador, Chile, Bertis James Vander Schaaff

Masters Theses

"The 'Old Workings Area,' so called for its early mining by the Incas, is located 4 1/2 miles northeast of the El Salvador Porphyry copper deposit, the third largest copper producer in Chile. The area mapped in this study is shown to consist of rhyolite pebble conglomerate, two volcanic flows, andesite and rhyolite porphyry, and two intrusions. Quartz porphyry and tourmaline-bearing breccia. Petrographic study of surface and drill core rock samples confirms the field nomenclature used for the five rock types. All of the rock types are altered, but the quartz porphyry and andesite are the most intensely altered. Both …

Tschebyscheff Fitting With Polynomials And Nonlinear Functions, George F. Luffel

Masters Theses

"It is the purpose of this study to survey the properties of the Tschebyscheff polynomials with particular reference to how they are employed as approximants and interpolants. The survey is extended to include the process known as "Tschebyscheff Approximation" or "Tschebyscheff Fitting" of a function by functions other than polynomials. One such fitting technique which will be of particular interest in this study is that of fitting f(x) by the function ab^x + c where a, b, c are real and b ≠ 1. In addition to a survey of the properties of the Tschebyscheff polynomials and of Tschebyscheff …

A Study Of Re-Evaporation Nuclei, Ronald Dawbarn

Masters Theses

"Classical considerations of the evaporation of a homogeneously nucleated droplet in an atmosphere of low humidity, indicates complete evaporation of the drop. Experimental results however, show that there is left behind a residual nucleus that is quite stable. Condensation occurs on these nuclei at comparatively low supersaturations. Using a specially instrumented cloud chamber, experimental procedures are described which attempt to investigate some of the properties of these nuclei. Various possibilities causing this stability are examined and compared to the experimental results obtained"--page [ii].

Coprecipitation Of Metal Salts With Organic Coprecipitants, Omar E. El-Arini

Masters Theses

"Coprecipitation studies were carried out for the more insoluble salts of six common metals and five anion systems. Three metal sulfides, namely, CuS, CdS and NiS, were the only metal salts studied that indicated nearly complete coprecipitation with phenolphthalein as carrier precipitate. The same salts showed almost no coprecipitation with B-naphthol as carrier precipitate. Solvent extraction of CuS with chloroform showed no significant amount of extraction had taken place. The data obtained in this work did not disclose any relationship between the extent of coprecipitation and the solubility product constant of the salt present. The main difficulty encountered at this …

Geochemical Prospecting For Copper In The Northern Part Of Yuma County, Arizona, Abdul Razak Kasim Al-Hashimi

Masters Theses

"Geochemical prospecting for copper has been carried out in two selected areas in the northern part of Yuma County, Arizona. These areas have a few old copper mines and some other zones of mineralization. The rocks of the area range in age from Precambrian to Quaternary and consist of complex gneiss, lava flows, schists, marble, sandstone, conglomerates and some intrusive dikes. A cold-extractible [sic] field method was used to study the relation between the copper content of stream sediments in washes and the geology, mineralization, and topography of the areas. A few total copper tests were also carried out. Another …

A Parameter Perturbation Technique Applied To Multipoint Iteration Functions For The Solution Of Systems Of Nonlinear Equations, Robert N. Delozier

Masters Theses

"The convergence of classical iterative procedures, when applied to a system of nonlinear algebraic or transcendental equations, is highly dependent upon a good initial approximation to the desired roots. Most of the classical iterative schemes have convergence factors between one and two. In this paper iterative schemes of order two and greater are studied in connection with a parameter perturbation process. The parameter perturbation process relaxes the restrictions on the choice of initial values. The procedure divides each problem into a number of subsidiary problems. Each subsidiary system of equations is then solved until a solution is found to the …

Near Optimal Sequencing :N Jobs And M Machines; All Jobs To Be Processed Through The Same Order Of Machines, Larry Glen Clark

Masters Theses

"There is a need, in industry, for an efficient method of determining an optimal sequence for processing a number of jobs through two or more machines. A method which requires a minimum amount of time would be most beneficial. The purpose of this study has been to define such a method. Tests on the method described indicate that although an optimal solution is not always obtained, the solutions obtained are quite good and due to the time factor the method would be beneficial to industry"--Abstract, page ii.

Comparison Of Methods To Select A Probability Model, Howard Lyndal Colburn

Masters Theses

"A comparison is made between the estimates of the parameters in a gamma distribution obtained by the method of moments with those obtained by a numerical approximation to the maximum likelihood estimates. The estimates obtained by the numerical approximation had a smaller mean squared error from the true value than the estimates obtained by the method of moments. Modifications to tests of fit are made in order to develop methods to select a distribution from a set of possible distributions for a population with an unknown distribution. These selection methods are compared in their ability to make correct selections. Although …

A Study Of The Piezometric Surface Of The Grand Falls Formation In The Duenweg-Oronogo Mining Belt East Of Joplin, Missouri, Renny Roger Nichols

Masters Theses

"The Joplin area of Missouri, which includes the Duenweg-Oronogo belt, was a famous zinc and lead mining district. Many mines were abandoned after World War I and filled with water. These provide a large potential supply of ground water. Expansion of industries and population in the area since World War II has caused a demand for water. In 1964, the Ground Water Branch, Water Resources Division, of the United States Geological Survey began a project to study the surface and ground water resources of the area. As part of his work on this project, the author measured the piezometric level …

Taxonomic Study Of Fossil And Recent Otoliths Of Certain Cuskeels, Gary Neal Pointer

Masters Theses

"Otoliths are calcareous structures occurring in the auditory labyrinths of teleost (bony) fishes. Three pairs of these earstones normally are found: the sagitta, in the sacculus; the asteriscus, in the lagena; and the lapillus in the utriculus. In fishes other than the Order cypriniformes (carp, catfishes, and related forms), the sagitta is the largest otolith, and it may be used in taxonomic and other studies. Fossil earstones of cuskeels (Family Ophidiiae-Brotulidae), constituting the Preophidion complex, occur in relative abundance at various levels in the Claiborne, Jackson, and Vicksburg groups of the Lower Tertiary on the Gulf Coast. The present study …

Geology Of Pride Mine And New Standard Mine Area, Northwestern Yuma County, Arizona, Henry E. Fernandez

Masters Theses

"A thick section of presumably Precambrian gneiss with thin intercalated bands of marble and schist has been mapped. There is structural continuity within these rock types as they are mutually intercalated, conformable, have gradational relations and show equal participation in the same individual fold. The layers of schist and marble in the gneiss can be followed over long distances. These rocks have undergone intense regional metamorphism, primarily dynamic, with a possible regional compressive force generated from NW-SE giving rise to sets of folds and faults in the area. From structural, petrographic and field evidence, it is concluded that the metamorphic …

Operating Characteristics Of A Cloud Chamber Suited For Condensation Measurements, Donald L. Packwood

Masters Theses

"It is the main purpose of this research to investigate the validity of using the adiabatic laws to determine the temperature from the pressure ratio. Some of the effects which might invalidate the use of the adiabatic laws will be studied. Special consideration will be given to the accurate calculation of [gamma]. Carstens' approximate calculation of the heat flow into the chamber due to conduction will be checked. A measurement will be made of how long the chamber remains adiabatic after an expansion when the continuing expansion technique is used. The static temperature gradient throughout the chamber will be measured …

Latent Class Analysis And Information Retrieval, George Loyd Jensen

Masters Theses

"Information retrieval may be defined roughly as a procedure to either locate or physically retrieve a document or documents containing information on a given topic with a high degree of reliability. Information retrieval is one of the newest fields in computing science. Being so new there are many unexplored areas. The research that has been done has not been standardized beyond the point of the effort which has been slanted toward solving the "Library Problem" ... Several different information retrieval methods have been suggested and some research done on them to try and solve the "Library Problem". Of these methods …

A Measurement Of Dead Space And Its Effect On The Homogeneous Nucleation Rate Of Water Vapor In Helium, Michael A. Grayson

Masters Theses

"The existence of a "dead space" surrounding each nucleated water droplet is demonstrated and measurements of its rate of development are made. The effects of this "dead space" are considered to be due to both the removal of vapor from the helium-water vapor mixture and the evolution of heat about the drop due to its growth. The results confirm the usefulness of the concept of a "dead space" and provide a means for its measurement with respect to time. Recommendations for further study and a method of correcting for dead space effects is given"--page [i].

Carcinostatic Sulfonic Acid Esters Of Selected 1,4-Diols, Robert A. Earl

Masters Theses

Introduction

The purpose of this research was to prepare the bisarylsulfonic acid esters of 1,4-butanediol and 1,4-but-2-ynediol.

This series of compounds is of interest because of the antitumor activity exhibited by the bismethanesulfonates of 1,4-butanediol and 1,4-but-2-ynediol. The compounds which were prepared were submitted to Cancer Chemotherapy National Service Center for evaluation in their anticancer program.

It was hoped that the compounds synthesized would be of pharmacological value. It was further hoped that the biological test data of these compounds would demonstrate a correlation between types of substituents on the aromatic nucleus and the degree of activity of the compounds. …

I. An Investigation Of The Organic Compounds In The Media And Mycelium Of Naucoria Confragosa. Ii. Study Of The Extra-Cellular Pigments Of An Unknown Fungus, Yueh-Tsun Chen

Masters Theses

"The fungal metabolites excreted into the culture fluid by basidiomycetes growing on synthetic glucose media as well as formed in the mycelia of the organisms were investigated in this thesis. Earlier unpublished work had shown that Maucoria confragosa excreted into the medium compounds which were thought to be phenols. Insufficient material was recovered from an ethyl acetate extract of the medium in the present study for further investigation. Colorimetric methods were employed both for the quantitative estimation of reducing sugar not consumed by the microorganisms as well as for a measure of the total organic solids present in the spent …

Geology, Geochemistry And Genesis Of Selected Skarn Deposits, Northern New Brunswick, Canada, Donald John Bachinski

Masters Theses

"An exhaustive geological and geochemical study is presented of magnetite-chalcopyrite skarn deposits occurring within the thermal aureole of the Nicholas Denys quartz maonzonie-granodiorite stock. The deposits are crudely lenticular and occur in metamorphosed impure limestone and siliceous, in part limy, argillite-greywacke. These are now represented by andradite-epidote-diopside-calcite skarn and cal-silicate to horn-felsic rocks respectively. Both deposits are spatially related to the Main fault of the Rocky Brook-Millstream fault system; late, generally northwest trending transverse faults are conspicuous and are deemed of importance in ore localization"--Abstract, page [ii].

Linear And Quadratic Programming With More Than One Objective Function, William John Lodholz

Masters Theses

"A computational procedure is presented for determining optimal solutions to the linear and quadratic programming problem when there is more than one objective function subject to linear constraints. In general a unique solution does not exist and a set of "best" or "efficient" points is determined and presented in graphical or tabular form. To solve the mathematical programming problems the simplex method is used for linear objective functions and Wolfe's method is used for quadratic objective functions"--Abstract, page ii.

A Second Study Of Homogeneous Nucleation Of Water Vapor In Helium, Raymond J. Schmitt

Masters Theses

"Absolute homogeneous nucleation rates in a supersaturated mixture of water vapor and helium are measured using a long sensitive time expansion chamber and a method devised by Kassner and Allard. A pulse technique is employed to produce the nucleation in an effort to suppress disturbing influences of vapor depletion and droplet growth. The time-varying nature of the supersaturation during the nucleation pulse is taken into account by an Integration over the pulse. Observed and theoretically predicted droplet concentrations are related by an assumed nucleation rate law which is adjusted until the total droplet populations predicted by integration of the assumed …

Geology Of Cienega Mining District, Northwestern Yuma County, Arizona, Elias Zambrano

Masters Theses

"The purpose of this investigation was to determine the general geology of an unusually complex area containing several small mines and located in the northwest corner of Yuma County, Arizona. This report is the first attempt to work out in detail the lithology, structure, stratigraphy, petrography, and economic geology of the area"--Introduction, Purpose and Scope, page 1.

Investigations Of Neutron Collimators And Detector Systems Used In A Neutron-Capture Internal-Conversion Apparatus, William Charles Johnston

Masters Theses

Preface

During the past six decades considerable effort has been devoted to investigating and explaining the phenomena associated with the atomic nucleus. However, many important features of the nucleus still are not understood. Among these are such fundamental aspects as the structural composition of the nucleus, the nature of the forces between nucleons, and several of the basic processes that occur among the nuclear constituents. The goal of nuclear physics is to construct a unified theory which is able to explain all nuclear phenomena.

The experimentalist contributes toward this objective by gathering and classifying extensive amounts of experimental data in …

Angular Correlation Of Co60, Henry Kuhlman

Masters Theses

Chapter I

Introduction

The probability that a radioactive nucleus will emit a gama ray may depend on the angle between the nuclear spin axis and the direction of emission. The radiation pattern of a sample of randomly oriented nuclei is isotropic. An anisotropic pattern may be observed if the nuclear spin axes are aligned.

The Reaction To Ketoacylhydrazones With Lead Tetraacetate, Lavern M. Weisenberger

Masters Theses

Introduction

It has been shown that ketohydrazones react with lead tetraacetate to give azoacetates in good yields (11) according to the following equation:

R₂C=N-NH-R + Pb(OAc)₄ → R₂C(OAc)-N=N-R + Pb(OAe)₂ + HOAc

The reaction of the structurally related 4,4- disubstituted ketosemicarbazones with lead tetraacetate quite unexpectedly gave carbamates in good yields (10) presumably according to the following equation:

R₂C=N-NH-Co-NR₂ + Pb(OAc)4 → R₂C-O-CO-NR₂ + N₂ + Pb(OAc)₂ + HOAc

CO

ı

CH₃

A Measurement Of The Spin Relaxation Time Of Optically Pumped Rubidium Vapor, Robert Oliver Breault

Masters Theses

Chapter I

The Problem and Atomic Energy Levels

In 1949 Francis Bitter proposed a method for optcally detecting radio frequency resonance. That same year Alfred Kastler, Fcole Normale Superiéure, Paris, France, introduced a technique, which he called "Optical Pumping", of concentrating atoms in some of the Zeeman sublevels of one of the hyperfine state levels of the ground state. These two experiments are the basis of research involving optical methods of atomic orientation and of magnetic resonance.

Distribution Of Sodium Perchlorate Between Tributyl Phosphate And Water, John A. Tengler

Masters Theses

"The questions posed by Carroll (23) concerning a TBP-H₂O system and an alkali salt -which is appreciably soluble in TBP have been partially answered by the experiments described in this thesis"--Conclusions, page 38.

Correlation Between Drying Times Of A Vinyl Copolymer Solution And Properties Of Dried Films., Abd El-Rahman M. Naser

Masters Theses

"One of the common methods used in film formation is the solvent evaporation method. As the evaporation starts the viscosity increases due to the inability of the solvent to keep the chains apart, which leads to a drag between molecules.

The rate of evaporation of the solvent (loss of solvent) cannot be equated with the rate of drying, since the latter depends on the results of the loss of solvents in terms of viscosity and plastic properties. The drying time can be defined as the rate at which a film increases its viscosity and thus changes the properties of a …

On A Numerical Solution Of Dirichlet Type Problems With Singularity On The Boundary., Randall Loran Yoakum

Masters Theses

No abstract provided.

A Study Of The Effect Of The Crystal Orientation On The Internal Friction Of Magnesium Single Crystals., Robert Ray Nothdurft

Masters Theses

"The method of growing, etching, and cutting magnesium single crystals is described in some detail. Ten single crystals of magnesium of different orientations were prepared and studied. The internal friction and relative Young’s modulus were measured for each specimen as a function of applied stress on a quartz composite oscillator. The effect of the orientation on the strain amplitude independent decrement, the strain amplitude dependent decrement and the ratio of the strain amplitude dependent decrement to the relative Young's modulus is compared to the theory of the pinned dislocation model of Granato and Lücke"--Abstract, p. ii

Aging Of The Dielectric Properties Of Some Perovskite Ceramics, Hector Troche-Maldonado

Masters Theses

"The effect of aging upon the dielectric constant and the dissipation factor were investigated for a number of lead titanate zirconate ceramics of varying composition. The ceramics investigated have a perovskite type structure. The materials chosen all have tetragonal symmetry at room temperature but are close in composition to materials of rhombohedral symmetry.

Empirical relations were determined for each specimen giving the rate of aging of the dielectric constant (K) and loss factor in terms of the frequency (f) and the elapsed time (t). The range of frequency was l kcps to l mcps; the range of elapsed time was …

Construction And Test Of Equipment For Use In Ultrasonic Pulse Echo Studies., Charles Joseph Reinheimer

Masters Theses

"An ultrasonic pulse generator was constructed with a variable pulse width ranging from 4 microseconds to 10 milliseconds and a repetition period varying from 15 milliseconds to 5 seconds. The oscillator had an almost continuous range from 500 kilocycles to 18 megacycles per second.

Its applicability in studies of internal friction of metals was demonstrated with a single crystal aluminum sample"-- Abstract, p. vi