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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 …

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, …

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 …

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.

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 …

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 …

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.

Flood Control With Retarding Basin Type Reservoirs In Meramec Basin, Missouri, Ilhan Kaya Ozbilen

Masters Theses

"When rainfall occurs that provides more runoff than can be carried within the normal channels of existing streams a flood results. The excess water overflows the valley lands, invades developed areas, and causes destruction of property or, in extreme cases, loss of human life...Many structures are built to control water: Waterways of proper depth and width provide arteries of transportation; water controlled and discharged through water-wheels provides power; water may be caught in storage basins and distributed for irrigation or water supply; and water that is an actual or potential source of damage or danger to property or to human …

The Precipitation-Runoff Relationship On The Grand River Basin Of Missouri And Iowa, J. Kent Roberts

Masters Theses

"In the study of a drainage basin which is to be utilized for water supply or water power, there is frequently a dearth or complete lack of runoff data, though precipitation data are almost always available. The Water Resources Branch of the United States Geological Survey maintains gaging stations on various streams and runoff records from these streams are available from their publications and offices. Many of these runoff records cover a considerable number of years, and are entirely sufficient for use in an analysis of any drainage basin covered by such data. Some of these gaging stations have not …

Effect Of Unionism On Cost Of Coal, Subrahmanya Padmanabhan

Masters Theses

"Coal is not only the base of our civilization and a key to our continued high standard of living but it is also playing a leading part in the recovery of Europe and other backward nations of the world. Our dependency upon coal as a basic source of energy is growing greater and greater every day. Some day atomic power may be our principal source of energy but the list of technical obstacles that block the way for widespread and commercial use of atomic energy is a long one. Unlike its competitors, such as petroleum and natural gas, the reserves …

A Comprehensive Traffic Survey Of Phelps County, Missouri, Clifford D. Muir

Masters Theses

"The purpose of this study is two fold. The first of these purposes is to serve as a pattern or guide for any county or township wishing to conduct a comprehensive traffic survey. The second purpose of this study is to provide traffic classification and other data on a typical county system of rural roads. Today, many counties in the United States are faced with the problem of inadequate roads, due to the modernization of the American farm. While they realize this problem exists, may county governments have developed no organized method of studying and determining their needs...When the author …

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 …

The Effect Of Calcium Chloride On Air-Entrained Concrete, Gerard Francis Hofstaedter

Masters Theses

"The essence of the problem is not fully set forth in the title in that all aspects are not covered. In this case, the term "effect" means how the compressive strength and the modulus of elasticity vary with the addition of calcium chloride...Many pages will be found concerning the relative merits of plain concrete versus air-entrained concrete. All phases of the problem have been covered thoroughly. Investigations have been conducted on both plain and air-entrained concrete to determine the compressive strength, flexural strength, durability and workability"--Introduction, page 1.

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 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 …

Thermal Recovery Of Petroleum By Electrical Heating, Harold Roy Coffer

Masters Theses

"It is the purpose of this investigation to study the feasibility of recovering oil from laboratory size cores by passing electric current through the formation. If a voltage of sufficient magnitude could be applied to the formation to cause a flow of current, the formation would be heated. This heat should stimulate the flow of oil. The expansion of any gas present in the core together with the formation of hydrocarbon vapors should provide sufficient expulsive force to drive oil from the core. The effect of power expenditure, the necessary voltages, the changes of conductivity and power factor of the …

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 …

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 …

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.

Torque-Stress Relations In Bolts With National Fine Threads, Eugene Casper Chase

Masters Theses

"Stresses, in bolts, caused by initial tightening have long been a problem to machine designers. To take care of these unknown stresses, produced by initial tightening, designers have used empirical formulas. These formulas originally used for National Coarse Threads, have been carried over into the field of National Fine Threaded bolts. No known tests have been conducted to determine whether or not these formulas hold in the initial tightening of Fine Threaded bolts. Initial tightening stresses may be caused by one of two ways. First, consider two flat ground plates to be held together by bolts to form a steam …

The Reflection Coefficient At The Truncated Corner Of A Rectangular Wave Guide, John Raymond Barcroft

Masters Theses

"The term wave guide refers to a hollow conducting tube (usually of rectangular or circular cross section) filled with a dielectric (or vacuum) and used for the transmission of electromagnetic waves. We shall consider the guide to be bounded by a perfect conductor and to be filled with a lossless homogeneous isotropic dielectric (or vacuum). The electromagnetic wave in the guide must of course satisfy Maxwell's equation. It must also satisfy the boundary condition that there be no tangential component of electric field at the surface of the conductor. If the electromagnetic waves traveling along the guide meet a discontinuity …

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 …

Effects Of Wave Action Upon The Design Of The Breakwater For Istanbul Harbor, Melih Suat Durusan

Masters Theses

"The city of Istanbul is situated on the southern entrance of the Bosphorus which separates Asia from Europe; at the same time it is the only strait that leads to the Black Sea. Istanbul is the city that connects Europe-Asia highways and railways. These features show that Istanbul is a very important port. The Golden Horn and the southern end of the Bosphorus constitute a natural harbor which has been in use for many years. Although the natural harbor has served its purpose in the past, the present conditions necessitate the presence of a new harbor...One economical method of improving …

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 …

A Survey To Determine The Most Economic Design For Concrete Runways Of A Class 4 Airport, Yani Triandafilidis

Masters Theses

"This study is for the purpose of determining the most economical design for the runways of the Yesilkoy airport in Istanbul, Turkey. The discussion will include different design methods for the runways and the longitudinal and transverse joints that will be used in each case to provide crack control in the runway surfacing.

The city of Istanbul has a population of about one million. It is a growing city, being the industrial center of Turkey, and it also serves as a terminal for transcontinental airway systems. For these reasons it was decided to construct a class 4 airport for the …

The Potassium Tungsten Bronzes, Ching Hou Ma

Masters Theses

"The tungsten bronzes are a series of substitutional solid solutions of alkali or alkaline earth metatungstates and tungstic oxides. They are not really metallic alloys or intermetallic compounds but they possess some marked metallic properties such as metallic luster, good electric conductivity, high specific gravity, etc. For this reason the name of "bronzes" is applied to them"--Introduction, page 1.

An Ecological Study Of The Foraminifera Of Mason Inlet, North Carolina, Daniel N. Miller Jr.

Masters Theses

"Mason Inlet. North Carolina is a lagoonal marsh area with warm-temperate water, the salinity ranging from fresh to salt water. Nine collecting stations comprise an ecological gradient across the environment.

Forty-two species of foraminifera are recorded from the inlet, ranging in their affinities from brackish water to open-sea facies. Several extensions of range are recorded both northward and southward.

Substratum conditions apparently control the distribution of foraminifera within the inlet. Clean, fine sand provided the largest faunal populations. A depauperate assemblage was found in an inorganic, argillaceous substratum. The largest population of arenaceous forms was found at the channel through …

Calibration Of Weirs By Means Of Critical Flow And Specific Energy, Robert A. Rapp

Masters Theses

"For many years man has been relying more each day upon metering devices to measure the flow of fluids in industry. The orifice, orifice meter, venturi meter, pitot tube, nozzle, flume and the weir have been employed, each having its own particular advantage.

In this parade of metering progress, the contracted weir has long been the forgotten brother of the suppressed weir. In almost every textbook on hydraulics or fluid mechanics, the following words appear, "end contractions are to be avoided where the weir cannot be calibrated". This skepticism and the length or absurdity of some contracted weir formulas led …

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; …