Digital Commons Network^™

Series Capacitors, Emcet Bilgeer

Masters Theses

"Static capacitors as an element of transmission and distribution circuits first appeared in the form of shunt capacitors. These shunt capacitors were primarily used in power factor correction. They can be regarded as a load in the circuit which draws a loading current. This loading current fleeing through the reactive line produces a voltage rise, thus reducing the voltage drop between sending and receiving ends. This phenomenon helps the voltage control of the feeder as well as power factor correction. The disadvantage of the shunt capacitor is its inflexibility. The shunt capacitor is connected across the line; hence the voltage …

Economic Analysis Of Secondary Distribution Networks, Charles F. Cromer

Masters Theses

"In the early history of commercial electricity in heavy load density areas, the d.c. Edison Network was developed extensively. As far as reliability is concerned it is exceeded by no system. At the present time it has been developed to the extent of automatic and non-automatic converters, motor-generator sets, booster sets and storage battery reserve capacity.

This type of network is fed from several substations in the area at utilization voltage.

As load densities have increased, the large amounts of copper required, the cost of substation sites and large rotating conversion equipment have made the expansion of the d.c. Network …

Stress Analysis Of Thin Bedded Mine Roofs Subjected To Evenly Distributed Lateral Load And Supported By Barrier Pillars, Sahap Sakip Aybat

Masters Theses

“Theoretical stress analysis in mine structures begins with the assumption that the structural elements are homogeneous, isotropic and perfectly elastic. It is this writers belief that stresses in a mine roof supported by barrier pillars may be compared to those stresses which may be found in a thin plate supported and restrained in the manner similar to such a mine roof. Therefore the stress and moment equations developed for plates are herein applied to mine roofs of limited thickness.

A thin roof bed which is stressed with evenly distributed lateral load and supported with barrier pillars will be regarded as …

The Effect Of A Uniform Layer Of Insulation On The Temperature Amplitude In Periodic Heat Flow, Ralph E. Schowalter

Masters Theses

"The object of this thesis is to determine by analytical methods the temperature at any time within a homogeneous semi-infinite solid protected by a uniform layer of insulation, while its one and only one plane face is subjected to a periodically fluctuating temperature. The temperature at an infinite distance within the solid is to remain constant, and the heat flow in the other two directions is to be considered negligible.

Periodically fluctuating temperatures are frequent in both nature and engineering. The surface of the earth is subjected to temperature changes which are very nearly periodic, and these changes are made …

A Correlation Function For Liquid Argon, Walter Graham

Masters Theses

"X-ray scattering patterns have given considerable information concerning atomic distributions in matter, both crystalline and amorphous. Work on the diffraction of x-rays by crystals was begun in 1912 by Friedrich, Knipping, and Laue, and much valuable information concerning the arrangement of atoms in crystals has been supplied by this method. Diffraction of x-rays by gases was studied as early as 1911, and work in this field has given information concerning the arrangement of atoms in molecules and electron distribution in atoms. Work on the diffraction of x-rays by liquids was begun by Friedrich who obtained diffraction patterns of Canada Balsam, …

Mineral Composition In Relation To Particle Size For A Missouri Plastic Fire Clay, John Edward May

Masters Theses

"From the rather modest beginning of the refractory industry in Missouri prior to the Civil War, the industry has grown to challenge those of other states as the third largest producer of refractory clays and products in the United States. As Roberts (1950) points out, the development of the metallurgical and glass industries increased the demand for high grade refractory materials. A prominent factor in the development of the fire clays of Missouri was the discovery that flint clay could be mixed with the plastic or semi-plastic refractory clays to yield an excellent product. Perhaps the most important reason many …

An Application Of The Atomic Distribution Function Of Liquid Mercury, Robert Lee Choate

Masters Theses

"The study of liquids and the knowledge of an adequate description of liquid structure have not advanced as rapidly as it has in the case of solids and gases. In a perfect crystal, the atoms or molecules are held in equilibrium positions by strong intermolecular forces. There are vibrations about these positions, but the translational energy is negligible. The molecules of an ideal gas move independently of each other and the intermolecular potential energy may be neglected. For each of these cases it is possible to derive a partition function from which the properties of the state can be readily …

Radioactive Carbon Labeled Molecules: A Method Of Synthesis, Glen E. Benedict

Masters Theses

"Use of isotopic carbon in determining organic reaction mechanisms is becoming more popular daily. The reasons for this trend are, the increasing availability of intermediate compounds, the increase in isotope handling knowledge, and mechanisms defined by well ordered tracer reactions are considered infallible.

The mechanism of reaction of halo-epoxides has been a point of conjecture for some time"--Introduction, page 1.

Relationship Of The Overall Transfer Coefficient To The Factor In Ammonia Absorption, Ivan Lee Gray

Masters Theses

"Gas absorption has an important role in chemical and allied industries. It is used to separate one of a group of constituents from a gas stream. Poisonous or obnoxious gases may be removed from the gaseous waste products of chemical plants by absorbing them in suitable solvents.

Many investigations have been carried out and references too numerous to list have appeared in the literature on the general subject of absorption.

In all of this work one of the usual methods of reporting results has been to express the capacity of a piece of absorption equipment as an overall capacity coefficient …

Torsional Modulus Of Rupture Of Thick-Walled Magnesium Alloy Fs-1 Tubing, Delbert R. Cox

Masters Theses

"Magnesium is taking a more prominent position in the structure of aircraft, and because of this, it is important that the mechanical properties of the material be understood more fully. In the high speeds of today, the tendency is toward the use of thick-walled tubing instead of the thin-walled tubing with stiffening structures. For this reason, it is of interest to note the characteristics of thick-walled tubing when subjected to torsion.

This thesis was first suggested by a circular letter on proposed thesis titles from the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio. When interest was …

Airflow Through Metallic Screening, Norman Bernard Wolk

Masters Theses

"The selection of the problem for which this paper offers a solution was made from a list of thesis subjects submitted to Dr. Aaron J. Miles by the United States Air Forces. This suggestion called for the development of a method whereby air flow through woven materials such as metallic screening and woven cloth could be predicted in terms of the pressure drop across the material. The range of the pressure differentials to be investigated was from zero to twenty inches of water.

After some preliminary work it became obvious that an investigation of the air flow through all types …

A Light Source To Be Used With A Vacuum Spectrograph, Roy George Woodle Jr.

Masters Theses

"A grazing incidence vacuum grating spectrograph for use in the vacuum ultraviolet was designed and partially constructed by Mr. L. H. Chapin, as a research project for a Master’s Degree. This instrument is designed to photograph the region of the spectrum from 100 Å to 1000 Å. As Boyce pointed out in his exhaustive review, there is much important observational work to be done in this region.

The author of this paper has undertaken to develop a satisfactory source for the region from 100 Å to 1000 Å. This is part of a project to photograph the emission and absorption …

Geology Of The North Half Of The Meramec Spring Quadrangle, Missouri, Harold Edward Mueller

Masters Theses

"The Ozark region is visited by many persons each year, and one of its popular tourist attractions is Meramec Spring. In recent years, with the advent of better roads and swifter means of transportation, visitors are coming to this beautiful spring in increasing numbers. For those who are geologists, this work will serve as a handy guide; for those who are laymen, this work may give a better understanding of the geologic events which have made this part of the Ozarks a place of scenic beauty. Mapping of the Meramec Spring Quadrangle will complete a program of geologic mapping of …

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 …

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 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 …

The Theory Of Limit Design As Applied To Column Analysis, John Francis Mccarthy

Masters Theses

"In any discussion of compression members of a structure, account has to be taken primarily of the relative "slenderness" or bending weakness of the member. If the member be so short that axial loading causes very slight deflection at any point throughout the member, it is usually designated a simple compression member and no account is taken of the additional stresses due to the deflection. When, however, the ratio of the length to the least radius of gyration of the member becomes so large that bending stresses cannot be ignored, the member is usually called a column and its consequent …

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.

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 …

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 …

Investigation Of The Effect Of Absorption Tower Size Upon Overall Mass Transfer Coefficients, James Robert Murrell

Masters Theses

"The purpose of this research project was to obtain data and determine whether or not a correlation exists between tower size and the overall mass transfer coefficient for a packed tower. A constant ratio of tower diameter to packing diameter of twelve to one was maintained. Three absorption towers were used; a twelve inch diameter iron tower, a six inch diameter iron tower, and a three inch diameter glass tower. One inch, one-half inch, and one-fourth inch Raschig rings were used in the corresponding towers as packing. The system used was the absorption of acetone by water from an acetone-air …

Analytical Investigation Of Bending Effects On The Stability Of A Tube Subjected To External Pressure, Charles Young

Masters Theses

"The behavior of thin and moderately thick-walled tubes under various types of loadings has been a major problem of several leading industries for many years. Predominant among these, and the one for which this thesis was primarily undertaken, is the oil industry. The problem attacked in this thesis, however, is not limited to that industry alone, having ample application in industries that are sub-marine in nature, or any industry in which the application of external pressures on equipment is likely to be responsible for buckling failures...In this thesis, the problem of finding the effect of bending on the collapsing pressure …

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 …

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 …

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.

Calculations Of Maximum Sag Of A Transmission Line With An Ice Load On One Span, Rodney A. Schaefer

Masters Theses

"An important problem concerning electric power lines is the calculation of the maximum sag occurring when there is an ice load on only one span. The object of this thesis is to determine a practical method for calculating the maximum sag of a transmission line, suspended on suspension insulators, with the aforementioned loading conditions. This paper is limited to the case where the supports of the transmission line are at equal elevations and all span lengths are equal"--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 …

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.

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 …