Digital Commons Network^™

Effect Of Removed Web-Section On Critical Load For I-Beam Columns, Henri Simon Rigo

Masters Theses

"This investigation deals with a series of column tests of aluminum I-sections which have a perforated web. Specifically, the tests show that the weight is decreased without decrease in strength. Several basic assumptions are made in the design of a column. The physical action of a column is idealized in the derivation of formulae which will predict within reasonable limits the load which the member will sustain. In a given installation of non-homogeneity of material, kinks, uneven bearing, lack of symmetry due to riveting or welding, stress concentration and many other disturbing factors not in agreement with these assumptions may …

A Study Of Missouri Flint Clay, Edmond Preston Hyatt

Masters Theses

"The problem is one of attempting to explain the peculiar nature of Missouri Flint Clay and to expand the knowledge concerning it. Among the questions for which answers are sought are: What makes Missouri Flint Clay so hard? What happens to Missouri Flint Clay when it is ground? What is the mineralogical constitution of Missouri Flint clay?"--Introduction, The Problem, page 1.

Temperature Fluctuations Within A Solid Of Finite Thickness, William Sanford Hogan

Masters Theses

"The object of this thesis is to determine by analytical methods the temperatures within a homogeneous plate of finite thickness subjected to a constant temperature on one side and a periodically fluctuating temperature on the opposite side. The heat flow in the other two directions is considered negligible in this problem. Periodic changes of temperature are frequent in nature and in engineering. The surface of the earth is heated periodically by the sun in its daily and annual cycle and the periodic temperature changes below the surface and the question to which depth these changes are appreciable were dealt with …

Separation Of Copper And Zinc On Synthetic Resins, Ernest Joseph Breton

Masters Theses

"It was desired to know whether ion exchange resins could be of value to the metallurgist in the recovery and separation of metals. The recovery and separation of copper and zinc from dilute solutions on Amberlite IRC-50, a carboxylic resin, and Amberlite IR-120, a nuclear sulfonic resin, were investigated. It was found that Amberlite IRC-50 could effectively remove copper ions from a solution of copper and zinc. Amberlite IR-120, due to the strong sulfonic acid groups, exhibited only a slight preference for copper as compared to zinc. It would seem that a judicious choice of resins coupled with appropriate chemistry …

A Grazing Incidence Vacuum Grating Spectrograph For Far Ultra Violet Spectroscopy, Lawrey Huber Chapin

Masters Theses

"Spectroscopy, in the region of the far ultraviolet from 100 Angstroms to 1000 Angstroms, requires special equipment and techniques, inasmuch as these wavelengths are highly absorbed by air. Many gases have resonant frequencies corresponding to the wavelengths mentioned and hence absorption bands appear in the spectrograms obtained by using spectrographs for the visible region. One solution of the problem of obtaining data in this region is to construct a spectrograph from which all intervening gas molecules have been removed, thus eliminating the absorbing material. A vacuum of 10⁻⁴ mm. of mercury is necessary to reduce the absorption to a value …

Rockbursts, Christian Maurice Colson

Masters Theses

"This paper does not pretend to originality; it is an attempt to bring to light the causes and the mechanism of rockbursts, as exposed in the literature. Furthermore, an endeavor has been made to give a comprehensive picture of the prediction, prevention, and control methods of rockbursts. Briefly, what has been done in the field of rockbursts, and what remains open to investigation is submitted to the reader. The choice of rockbursts as a thesis subject appears to be justified by the geologic interest of the question. Detailed geologic observations, and particularly the recording of all the structural features which …

Separation Of Cobalt From Zinc Sulfate Solutions By Synthetic Cation Exchange Resins, Wen-Hsiang Chang

Masters Theses

"The purpose of the present research is primarily to investigate the possibility of the separation and recovery of cobalt from zinc sulfate solutions by means of cation exchange resins. It is thought that such an investigation, seemingly of academic interest, might throw some light on determining the possibility of processing some industrial solutions containing both cobalt and zinc. Cobalt, for instance, has been well known as one of the most detrimental impurities in zinc electrolytic solutions. In spite of various purification treatments, small amounts of cobalt are often present in the electrolytic solution, causing a reduction in current efficiency and …

Solid Solution In The Series Sodium Tungsten Bronze, Lithium Tungsten Bronze And Tungstic Oxide, Godrej F. Doctor

Masters Theses

"The tungsten bronzes are a series of anionic substitutional solid solutions of alkali metal metatungstates and tungstic oxide. They are neither alloys nor intermetallic compounds, the term tungsten bronzes was adopted because of their remarkable metallic properties, e.g. luster, specific gravity and especially high electrical conductivity, which resembles to that of graphite. Due to its chemical inactivity and beautiful shades of color, it is used as a coating, especially in the plastic industry and for other ornamental products. The properties and the structure of these bronzes have not been investigated entirely satisfactory; within the last twenty years, only a few …

The Theory Of The Specific Heat Of A Face-Centered Cubic Lattice, Charles Robert Bonnell

Masters Theses

"It is generally accepted that a normal crystalline solid can be pictured at absolute zero as an assembly of atoms at rest arranged at periodic lattice points. Since at higher temperatures each molecule becomes a harmonic oscillator about its lattice point, it is necessary to know the distribution of normal modes of vibration in order to calculate the thermodynamic properties of the lattice...Many approaches have been made to get a simple solution of the problem, but either accuracy is sacrificed for simplicity, or the solutions demand a very considerable amount of labor. The classical theories failed to explain the change …

A Study Of The Efficiency Of Split-Second Delay Electric Blasting Caps In Underground Limestone Mining, John B. H. Fitzwilliam

Masters Theses

"The introduction of electric blasting caps have delay intervals of the order of one-half to one second proved of advantage in many aspects of underground mining, particularly development work. Their use spread, until they now supersede fuse-and-cap firing wherever possible. Split-second delay electric blasting caps are a comparatively recent development from conventional delay caps. They have been found of practicable use in quarrying operations, and have been applied in many phases of underground mining. While evidence, to show that short-delay firing in quarrying is more efficient than instantaneous firing, is becoming increasingly conclusive, it remains to be proved that split-second …

A Study Of Cast Eutectic Structures By Means Of Optical And X-Ray Microscopy, John Stanton Winston

Masters Theses

"The present research is the result of interest in two rather broad, and at first thought, seemingly entirely separate topics: the structure of eutectics and x-ray microscopy. D. Hanson in 1923 in his correspondence with Albert M. Portevin in regard to his article on the structure of eutectics states, "A point that always stuck him (D. Hanson) in examining eutectics was that one of the constituents always formed a continuous phase round the other one. The orientation of one constituent was either constant or varied in a uniform manner. What, however, was the condition of the 'enveloped' constituent, which formed …

An Experimental Study Of Crystallization In Opal Glass, William C. Rous

Masters Theses

"Opal glasses are well known from use in such forms as ointment jars, lighting globes, wall panelling [sic], and decorative effects in glass vases. Cryolite, fluorspar, and sodium fluosilicate are used in varying proportions in most glasses of this type. Since little is known of the mechanism of crystallization in opal glass, there is a definite need of gathering further information on this subject. This information is of particular interest to the manufacturers whose products consist of this type of glass. Further information would aid in control of the characteristics desired and perhaps would allow a more economical control"--Introduction, page …

Velocity Studies In A Vertical Pipe Flowing Full, Robert Franklin Tindall

Masters Theses

"The purpose of this investigation is to install a hard drawn copper pipe approximately 1/2 inch in diameter, and approximately 35 feet long in a vertical position. The copper pipe is to have pressure takeoff points at various distances along the length of the pipe. The purpose of these takeoffs is to measure the pressure of the water at the point of takeoff in the pipe. The water is to be forced into the pipe, assisted by gravity, thereby causing a pressure of some measurable quanity [sic] greater than absolute zero pressure. The discharge was to be by volumetric measurement, …

The Determination Of The Solubility Of Hafnium Oxide In Aqueous Solution By The Radioactive Tracer Technique, Hampden O. Banks

Masters Theses

"To date, there is no information in the open literature concerning the solubility of hafnium oxide in water other than the fact that it is very insoluble. This lack of experimental information is due, partly, to the fact that hafnium is a relatively new addition to the list of known elements"--Introduction, page 1.

Ammonium And Alkylammonium Salts Of Carboxylic Acids As Characterizing Derivatives, Hal Gilbert Lankford

Masters Theses

"One of the methods widely used to establish the identity and purity of an organic compound is to prepare various derivatives, the properties of which have been reported in the literature. The object of this investigation was to prepare ammonium and alkylammonium salts of carboxylic acid and determine their utility as characterization derivatives. Should these salts meet the requirements of a satisfactory derivative, they would be particularly valuable from a standpoint time, since they are generally very quickly formed"--Introduction, page 1.

Effects Of Sand Admixtures On The Physical Properties Of Soils, Necati Kanatsiz

Masters Theses

"The purpose of this study is to determine the effects of sand admixtures on the physical properties of soils. Soil may be defined as a heterogenous [sic] collection of rock and mineral fragments whose decomposition and disintegration have been brought about by the action of physical, chemical, and biological forces, working singly or in combination...In the conviction that the study of soils, with respect to highway engineering, is becoming more and more important this study was undertaken in order to learn whether the addition of sand would lead to desirable results, and if not, at least secure some further addition …

The Volatility Of Metallic Sulfides And Their Treatment By Vacuum Metallurgy, Chi-Mei Hsiao

Doctoral Dissertations

"The purpose of this investigation is to determine the vapor pressure or volatility of the sulfides of the following metals by Langmuir's method: a) Zinc b) Cadmium c) Mercury d) Manganese e) Tin f) Lead g) Arsenic h) Antimony i) Molybdenum J) Iron k) Cobalt l) Nickel m) Copper n) Silver o) Calcium p) Aluminum.

The relation of this property to the position of the metals in the periodic table will be discussed, thus the vapor pressure or volatility of the remaining metals can be predicted as to the order of magnitude if the law of periodicity holds.

The possible …

The Energy Levels Of Potassium Chloride, Clifford L. Adams

Masters Theses

"An understanding of the electronic energy states of solids has long been considered of importance. And the energy levels of the alkali halides have been the subject of much study in recent years. The present work is an attempt to set up an energy-level diagram for potassium chloride"--Introduction, page 1.

The Theory Of The Specific Heat Of A Body Centered Cubic Lattice, Curtis Cleveland Webster

Masters Theses

"In normal crystalline solids the atoms are at rest in their lattice points at absolute zero of temperature. Increasing the temperature of the crystal increases the motion of the atoms about their lattice points. Approximately, each atom or ion may be treated as a harmonic oscillator. then from the equations of motion of the atoms, by the Born-von Karman theory of specific heats, the normal modes of vibration of the lattice can be expressed as the roots of a secular determinant. Application of this theory to determine the thermodynamic properties of crystals has resulted either in solutions that are inaccurate …

Design And Test Of An Apparatus For Rate Measurements Of Rapid Gas Reactions, Erich Rolaff

Masters Theses

"The present study on rapid gas reactions was initiated with two main goals in view. The first objective was the development of equipment and methods for the treatment of problems arising in extremely rapid gas phase reactions. In recent years, with the advent of large scale applications of gas turbines and rocket motors, the process of high speed gas reactions, especially those of combustion and oxidation have become of increasing importance...The second main goal of the work was to apply the methods and equipment developed to the investigation of chemical systems of interest"--Introduction, page 1-2.

The Application Of The Relaxation Method To The Solution Of Steady-State Heat Transfer Through A Concentric Square Insulator, William Edward Simpkin

Masters Theses

"It is the object of this thesis to express the relationship between the heat transfer through a square insulator of variable inside-outside dimension ratios, in terms of a concentric round insulator of the same inside-outside diameter ration, by means of a continuous curve. Mathematically speaking, this thesis will have a plot of a variable coefficient, c_s, to be used...in terms of the ratio of the width of the outside square to the width of the inside square"--Statement of Problem, page 8.

The Effect Of Pressure Prehydration On The Strength Of Hydraulic Cement Concrete, Thomas Holmes Whitfield Jr.

Masters Theses

"It appears that the rapidity of curing and the degree or ultimate strength of concrete can be influenced by both chemical and physical factors. The main function of the physical factors involved seems to be the creating of a more intimate combination of the cement and water which are the active ingredients. For example, finer grinding of the cement would present more surface area to the water; the application of heat would decrease the amount of surface tension of the water, in addition to speeding the chemical reaction, steam under pressure would force water into the porous particles of cement; …

Geology Of The Crystal Mine, Hardin County, Illinois, John Amsden Emery

Masters Theses

"The study of the geology and mineralization of the Crystal Mine was undertaken at the suggestion of Mr. Dodson G. Gibson of the Crystal Fluorspar Company, who allowed access to the mine and its records for this purpose. The problem was to develop a system of prospecting the so-called bedded-replacement fluorspar deposits of Hardin County, Illinois. It is believed that an economically feasible method has been developed. This method involves not only the actual finding of fluorspar, but also serves as a guide in revealing structural trends suggestive of mineralization.

The fluorspar deposits of the Crystal Mine are representative of …

Field Resolution Tests With The Metrogon Lens, Robert Greig Livingston

Professional Degree Theses

"The first portion of this treatise is devoted to a compilation of general knowledge concerning photographic resolution testing - an explanation of certain optical terms; the drafting of resolution targets; methods for averaging resolution values, measured at various positions on the format, to obtain one over-all value for an exposure; and a description of the factors involved in conducting the photographic operations. In the second part of the paper, analyses of the results obtained from line-target resolutions are made with the purpose of determining those combinations of aperture, filter, and shutter speed which result in high photographic resolutions. This information …

Experimental Studies Of The Effect Of Moisture On Strength Of Mine Roof-Shales, Rolf W. Roley

Professional Degree Theses

"The mining and production of coal by underground mining operations has long been recognized as one of this nation's most hazardous industries. Tabulated data from the State of Illinois, for example, reveal that in that State between 1882 and 1945 there have been 7,789 men killed in coal mining accidents of one form or another. Further inspection of the data indicates that 3,711 of these men were killed underground by falls of roof or rock….

As previously stated, this experiment was designed to determine whether or not any appreciable change in strength as measured by Transverse Breakage would result from …

A Study Of Relative Ionic Mobility Of Alkali Ions In Dilute Alkali-Boron Trioxide Glasses As Deduced From Space Charge Considerations, Theodore J. Planje

Doctoral Dissertations

"The extensive investigations in the past have conclusively established that the alkali ions are responsible for the electrical conductivity of glass in both the brittle and viscous states; however, with the exception of one investigation in the brittle state, little consideration has been given to determination of the mobility of the alkali ion in such glassy systems. A review of the literature pertaining to the electrical conductivity of glass is presented.

A method, based on the rate of development of the ionic space charge responsible for polarization of conductivity cell employing direct current voltages, is proposed as a means for …

A High-Temperature X-Ray Diffraction Camera And Its Application To Copper And Titanium, Robert R. Penman

Masters Theses

"The purpose of this research was threefold, and consists of the following sections: 1. Effective use of a high temperature x-ray camera, capable of reaching temperatures of 1000 ºC. 2. Investigation of the thermal dilation of certain cubic metals. 3. Accurate determination of the lattice constant (aₒ) of Beta Titanium at 900 ºC "--Introduction, page 1.

Intermolecular Potential Functions For Liquid Argon And Liquid Mercury, Richard H. Kerr

Masters Theses

"The purpose of this research is to obtain such intermolecular potential functions for liquid argon and liquid mercury by use of the experimental radial density functions available for these two liquids over a wide range of temperatures. We shall introduce the notion of a correlation between the motions of atoms in neighboring cells in a cell theory of liquid structure, and derive a theoretical radial density function involving the intermolecular potential function for a pair of atoms in the liquid. This radial density function, or as it is frequently termed, the atomic distribution function, applied to the experimental data should …

The Temperature Within A Homogeneous Plate Of Finite Thickness, Charles R. Remington

Masters Theses

"The object of this thesis is to determine by an analytical method the temperature within a homogeneous plate of finite thickness subjected to a constant temperature on one side and a periodic fluctuating temperature, expressible in a Fourier series, on the opposite side. This problem in periodic temperature changes has not, to the author's knowledge, been solved previously. The flow of heat in the problem is considered in only one direction, the x-direction. Flow in the other two directions is considered negligible, or zero. Periodic temperature changes in the earth are of importance. The temperature changes have been used by …

A Determination Of The Surface Tension Of Bismuth, Cadmium, Tin, And Lead, Edward Mckee Chandler

Masters Theses

"Various methods have been employed for the determination of surface tension including capillary rise, drop weight, maximum bubble pressure, sessile drops on flat surfaces, sessile bubbles formed underneath flat surfaces, and the shape of pendent drops. Each method is subject to characteristic advantages and disadvantages. Only two of these will be discussed. The method of maximum bubble pressure allows the formation of a fresh surface for every bubble but does not permit the study of a given sample over a period of time. The sessile drop in direct contrast, allows the observation of the same sample over any period of …