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Articles 2371 - 2387 of 2387
Full-Text Articles in Physics
A Correlation Function For Liquid Argon, Walter Graham
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, …
The Energy Levels Of Potassium Chloride, Clifford L. Adams
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
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 …
The Theory Of The Specific Heat Of A Face-Centered Cubic Lattice, Charles Robert Bonnell
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 …
Intermolecular Potential Functions For Liquid Argon And Liquid Mercury, Richard H. Kerr
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 …
A Determination Of The Surface Tension Of Bismuth, Cadmium, Tin, And Lead, Edward Mckee Chandler
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 …
A Grazing Incidence Vacuum Grating Spectrograph For Far Ultra Violet Spectroscopy, Lawrey Huber Chapin
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 Reflection Coefficient At The Truncated Corner Of A Rectangular Wave Guide, John Raymond Barcroft
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 …
Application Of Electrical Prospecting Methods To Two Types Of Sulphide Ore Deposits, Robert Van Nostrand
Application Of Electrical Prospecting Methods To Two Types Of Sulphide Ore Deposits, Robert Van Nostrand
Masters Theses
"Although certain types of sulphide ores, especially those near the surface of the earth, lend themselves very well to electrical prospecting methods, quite the opposite is true of the extensive deposits of the type found in the Mississippi River Valley. The purpose of this investigation was to discover additional facts concerning two distinct types of sulphide ores, and therefrom to develop a new technique which would be applicable to prospecting for the lead and zinc deposits found in the Mississippi Valley"--Introduction, page 1.
Plateau Characteristics Of Geiger Counters With Respect To Different Gas Mixtures And Pressures, Ralph E. Lee
Plateau Characteristics Of Geiger Counters With Respect To Different Gas Mixtures And Pressures, Ralph E. Lee
Masters Theses
"The section of a Geiger Counter is characterized by the so-called plateau curve. In this curve the counting rate of a given counter is plotted as a function of voltage, when the gas which it contains and the radiation to which it is exposed are both kept the same. These curves are characterized by a rapid rise beyond the starting potential (potential at which the counter begins to respond) until a more or less flat region is reached. This flat region is called the plateau of the curve. The slope and width of the plateau curve are dependent upon the …
A Determination Of The Surface Tension Of Tin In The Solid State, Charles Merton Rice
A Determination Of The Surface Tension Of Tin In The Solid State, Charles Merton Rice
Masters Theses
"Many studies have been made on the surface tension of metals but almost exclusively in the liquid state. Information on metals in the solid state is needed in pure physics to test theories of cohesion and in physical metallurgy to explain sintering. The common approach to the problem of surface tension in the solid state is to hang a weight on a thin wire or leaf of metal and then heat this weighted sample to a temperature at which flow is appreciable. The shrinkage or stretch of the sample is then a measure of the surface tension. Of the recent …
The Effect Of Spontaneous Crystallization Of Some Inorganic Compounds At The Critical Temperature Of Their Solvents, John William Buttrey
The Effect Of Spontaneous Crystallization Of Some Inorganic Compounds At The Critical Temperature Of Their Solvents, John William Buttrey
Masters Theses
"For many years the phenomena which occur at the critical temperature of liquids have been investigated. And since 1912, when Laue and other discovered that a beam of x-rays could be made to yield a diffraction pattern by passing it through a crystal, scientists have been attempting to change the x-ray pattern for various crystals by somehow changing the arrangement of the atoms in the crystal lattice. Harvalik has already shown that crystallization occurs when a solvent reaches the critical point and his work indicates that under these conditions of crystallization there is a change in the crystal pattern. The …
A Microwave Polarimeter, Alfred E. Schwaneke
A Microwave Polarimeter, Alfred E. Schwaneke
Masters Theses
"The dissertation on the following pages may read more like a construction article than an approach to a study of physical phenomena. If so, its purpose is clearly defined. this subject has been studied little from an experimental viewpoint, so one of the main objectives of this writing is to describe the instrument so others may read the article and reproduce this or an equivalent device without a great amount of reading and searching for information on just how to fabricate and mount the parts. No single book or article that I know of covers the inexpensive construction of such …
Hysteresis Loss Of Supermalloy At Different Temperatures, Chester Ray Holland
Hysteresis Loss Of Supermalloy At Different Temperatures, Chester Ray Holland
Masters Theses
"The object of this investigation was to measure the hysteresis loss of supermalloy at different temperatures, and to see if temperature had any effect on hysteresis loss and permeability. The maximum magnetizing current was held constant for all temperatures"--Introduction, page 1.
The Kerr Electro-Optic Effect In Plastic Materials Transmitting Infra-Red Radiation, James Edson Dueker
The Kerr Electro-Optic Effect In Plastic Materials Transmitting Infra-Red Radiation, James Edson Dueker
Masters Theses
"Much work has been done investigating the Kerr Electro-Optic effect and what physical properties of a substance lead to the occurrence of the phenomenon. Information now available indicates a relationship between molecular shape and orientation with the Kerr Effect, hence any added information increases the possibility for finding the exact relationship and the molecular structure of substances. The Kerr Effect, has been used in a number of applications other than for the study of molecular construction of matter. Many applications have been made to form Electro-Optic shutters. This field of work has been increased to include light flash production and …
Radioactivity Of The Pre-Cambrian Section Of The Bourbon, Missouri, Well Core By Measurement Of The Total Hard Gamma Radiation, Paul E. Damon
Radioactivity Of The Pre-Cambrian Section Of The Bourbon, Missouri, Well Core By Measurement Of The Total Hard Gamma Radiation, Paul E. Damon
Masters Theses
"In December of 1947 Mr. Robert Van Nostrand and the writer became interested in the problem of the distribution of natural radioactivity and the applications of radioactivity to geology. A cooperative survey of the literature on the subject was undertaken. Later the writer decided to follow up the survey with a research project. Consultations with Dr. Z. V. Harvalik of the Missouri School of Mines Physics Department, and Dr. E. L. Clark and Mr. O. M. Bishop of the Missouri Geological Survey, followed. The nature of the project was evolved when Dr. Clark, with the consent of the U. S. …
A Study Of An Objective Placement Examination For Sectioning College Physics Classes, John Milton Willson
A Study Of An Objective Placement Examination For Sectioning College Physics Classes, John Milton Willson
Masters Theses
"For several years the Department of Physics of the Missouri School of Mines has practiced sectioning of its classes in general physics. The aim has been to segregate in one section the students of superior ability, giving them a course including both the fundamentals of physics and their applications in engineering. The remainder are given a course in fundamentals without placing so much stress upon the applications...Another criterion used to supplement the first-year grade record is the student's score on the Iowa Placement Examinations. The physics examination consists of two parts, the Training Series and the Aptitude Series. These examinations …