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Radioactive Disintegration, Robert Katz

Robert Katz Publications

The conventional development of parent-daughter relationships in radioactive disintegration follows the treatment given in Rutherford, Chadwick, and Ellis in which a trial solution of the differential equations appropriate to the process is proposed, and the arbitrary constants are evaluated by application of boundary conditions. At the senior-graduate level at which the first course in nuclear physics is usually taught, the following derivation is believed to be considerably more instructive.

A Differential Electronic Photometer And Polariscope With Negative Feedback, William Rogers

Physics & Astronomy ETDs

In connection which a program of research in the physics of the atmosphere, a need has arisen for a sensitive differential photometer which would be adaptable to balloon-borne operation. This paper describes a prototype of such an instrument. The present photometer is constructed for preliminary investigations to be carried out in the laboratory, but with light weight components used in the design except for the power supply and the main structural frame. Consideration is given to these latter features to the extent that the entire equipment is designed for operation from power sources which can be directly replaced by small …

An Experimental Investigation Of A Light Weight High Voltage Power Supply, James F. Tribby

Physics & Astronomy ETDs

This investigation is directed toward the development and design of an electronic high-voltage power supply. The method consists of obtaining a direct current of low intensity by periodically charging by means of a primary battery a group of capacitors in parallel combination and discharging them electronically in series. A stimulus to this investigation is provided by the need for a light-weight electronic current source operating at moderately high voltages which is stable and capable of maintaining a constant current of low intensity over a wide range of variation of the potential from a primary battery. In addition, a power supply …

An Experimental Determination Of The Distribution Of Core Location Of Extensive Air Showers, Jerre P. Moore

Physics & Astronomy ETDs

It is the purpose of this paper to investigate the distribution of the core location of extensive air showers striking near an array of liquid scintillators.

Determination Of The Shape And Position Of The Zodiacal Light By Use Of An Automatic Recording Method, James D.G. Lindsay

Physics & Astronomy ETDs

The problem was to determine the shape of the zodiacal light pyramid and also its position relative to the ecliptic using an automatic recording system. The main requirement was to be simplicity in the interpretation of data.

The Freezing Point Of Water In Puddled And Unpuddled Soils At Different Soil Moisture Tension Values, Robert B. Campbell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A technique that will adequately describe the physical condition of water in the soil has long been desired by scientists. The method should include the effect of soluble materials on the osmotic pressure of the soil solution, and also the effect of surface force action between the soil and soil water.

Parker (8) demonstrated that the freezing point was reduced in the presence of finely divided material. This suggested the possibility of using the cryoscopic procedure to measure the physical condition of water soil. More recently, the introduction of Thermistors for accurate temperature measurement have made it desirable to investigate …

A Demonstration Of Various Procedures Used To Interest And Help Pupils To Understand Physics, O. M. Bjeldanes

Journal of the Minnesota Academy of Science

No abstract provided.

Modern Physics, Charles L. Critchfield

Journal of the Minnesota Academy of Science

No abstract provided.

Oxidation Of Silver As A Method Of Measuring Ozone Concentration, Lorne Maxwell Chanin

Physics & Astronomy ETDs

It has been found that, under certain conditions, a chemical reaction occurs between silver and ozone. The products of this reaction are silver oxides and oxygen. When heated to a certain temperature, the silver oxides are decomposed into silver and oxygen. If this reaction were produced, then the amount of oxygen resulting from the decomposition would be a measure of the amount of ozone originally present.

The Intensity Of Zodiacal Light, Allan F. Beck

Physics & Astronomy ETDs

The study of the intensities measured in the region of the zodiacal light, the second most important contributor to this light of the night sky after starlight has been subtracted, is the purpose of this paper.

Note Concerning Cloud Chamber Experiments With Positrons, H. M. Schwartz

Journal of the Arkansas Academy of Science

No abstract provided.

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 …

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, …

Statistical Fluctuation In Radioactive Phenomena, James A. Grundl

Bachelors’ Theses

It is the purpose of this thesis to present a method applicable to an intermediate laboratory course in Modern Physics of establishing the random nature of radioactive disintegrations. The method is fundamentally that used in 1910 by Rutherford and Geiger.

Integrated Scattering Of Microwaves By Small Metal Spheres, A. L. Merts

Masters Theses

"When electromagnetic radiation falls upon a material body of any kind, the associated electric field induces periodic oscillations of the electrons of the material synchronous with the incident radiation. The material serves as a secondary source and emits energy in the form of scattered radiation with a frequency equal to that of the incident electromagnetic wave. The polarization and intensity of the scattered radiation are determined by the size, shape, electric constants, and interactions among the scattering elements.

The scattering of electromagnetic waves is an old problem in physics. Such names as Rayleigh, Debye, and Mie have become associated with …

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 …

Square Wave Modulation, Richard Henry Duncan

Masters Theses

"Modulation of a radio frequency carrier can be defined as the variation of some wave parameter such as amplitude, frequency, or phase, in accordance with intelligence to be transmitted. An unmodulated carrier is simply a continuous sine wave and contains no information other than the fact that the transmitter has been turned on. The spectrum of an unmodulated signal consists of a single frequency. Any type of modulation is characterized by the appearance of additional frequencies, known as sidebands. One of the fundamental problems in radio engineering is to reduce the number of sidebands to a minimum and still adequately …

The Completion, Adjustment, And Operation Of A Grazing Incidence Vacuum Ultraviolet Spectrograph, William Clinton Johnson-Chamberlain

Masters Theses

"Most gases, and particularly oxygen and nitrogen, are nearly opaque to radiation in the region from about 1800 Å downward to about 2 Å and hence, for spectroscopic work in this region, the removal of these gases is mandatory. Popular usage generally refers to the range mentioned above as the vacuum ultraviolet. That there remains much experimental work to be done in the vacuum ultraviolet has been pointed out by Boyce in his exhaustive survey of vacuum ultraviolet spectroscopy. In order to fill in some of these gaps, Mr. L. H. Chapin, in the, spring of 1950, undertook the construction …

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 …

A Lead Sulfide Near Infrared Detection System, William V. Cummings Jr.

Masters Theses

"The infrared region of the spectrum is conveniently divided into the near infrared, which extends from the red end of the visible to about 25 microns, and the far infrared, which continues to an ill-defined division point of approximately 1,000 microns. The near infrared region has been further subdivided on the basis of instrumental techniques so that the particular portion of the spectrum consisting of radiations of wave length up to 3 microns has become known as the photoelectric infrared.

Several types of detection instruments have been designed and perfected for work in the photoelectric region, but new methods and …

The Polarization Of Zodiacal Light, Maynard Cowan

Physics & Astronomy ETDs

It was the purpose of this study, (1) to measure the polarization of zodiacal light, (2) to investigate the orientation of the plane of polarization, and (3) to deduce from results obtained information concerning the origin of zodiacal light.

United States Patent: Antenna Guy Fitting, Robert Katz

Robert Katz Publications

The invention to be hereinafter described relates to coupling devices for the attaching of fixed wire antenna to aircraft.

Heretofore, it has been the general practice to make connections between the fixed wire antenna and aircraft by wrapping the antenna wire about a thimble or like device, as in making a splice.

This practice resulted in a number of sharp points and rough surfaces whose susceptibility to corona discharge is well known. This corona discharge resulted in bad weather extremely difficult or dangerous due to interruption of radio navigation and communication services.

The present invention is designed to overcome the …

Application Of X-Ray Technique To The Detection Of Internal Insect Infestation Of Grain, Max Milner, Milford R. Lee, Robert Katz

Robert Katz Publications

During the course of a comprehensive investigation of methods for the determination of internal insect infestation in commercial wheat, radiographic techniques have been developed at this station which provide satisfactory delineation of internal infestation. We have applied these techniques to the observation of the growth of such insects as granary weevil, Sitophilus granaries L., and rice weevil, Sitophilus oryza L., from the hatching of the egg within the kernel through larval and pupal growth to emergence as a mature insect. Although considerable detail is always lost in the reproduction of radiographs during engraving and printing, the accompanying figures (1, …

A Simple Experiment On Heat, Robert Katz

Robert Katz Publications

This experiment requires apparatus consisting of two ring stands, two bunsen burners, safety matches, a sheet of hard asbestos board and a sheet of aluminum of approximately the same dimensions (6 in. long by 3½ in. wide by ⅛ in. thick). The ring stands are set side-by-side with the sheet of aluminum on one and the sheet of asbestos on the other. Two matches are placed on each sheet; one in the middle directly above the bunsen burner and one on the edge, two or three inches away. In what order will the matches catch fire after the burners are …

The Coexistence Of Eight Liquid Phases, Herbert A. Goeden

Bachelors’ Theses

For years chemists have been attempting to produce multiple immiscible liquid phase systems. The author has discovered a system of eight liquid phases in equilibrium. The eighth layer is a silicone oil. In order to utilize the silicone oil it was necessary to change two of the seven phases previously recorded.

The Coexistence Of Eight Liquid Phases, Herbert A. Goeden

Bachelors’ Theses

For years chemists have been attempting to produce multiple immiscible liquid phase systems. The author has discovered a system of eight liquid phases in equilibrium. The eighth layer is a silicone oil. In order to utilize the silicone oil it was necessary to change two of the seven phases previously recorded.

A Study Of An Inverse Feed-Back, Low Frequency, Low-Pass Filter, Ralph A. Nobles

Physics & Astronomy ETDs

In connection with other research work in the physics department at the University of New Mexico it became of interest to make a detailed study of a resistance-capacitance couples low-pass filter which incorporate inverse feed-back. In order to determine the effect of the inverse feed-back on the filters, calculations are made on circuits with and without feed-back. Response curves are calculated for step-wave inputs and for sine-wave inputs, and these calculated curves then compared with experimental response curves.

A New Method Of Detecting Low Intensity Nuclear Radiation, Emerson Jones

Physics & Astronomy ETDs

In general there exist in the energy level scheme of many of the elements, transitions which give rise to the liberation of energy in the visible or near visible spectra. This situation gave rise to the hope that a gaseous element could be selected such that upon being excited or ionized by charged particle radiation, the predominant transitions to lower energy levels could be detected by photographic means. If a means of detecting these transitions could be made sufficiently sensitive, one could then hope to detect very low radiation intensities of charged particles. The problem consisted of evacuating a chamber, …

Fluorescent Effects Produced By Rare Earth Elements, William J. Stekiel

Bachelors’ Theses

The subject matter of this thesis had its origin in a phenomena observed in the laboratory during a crystal analysis experiment by means of X-ray diffraction. While using crystals composed mainly of Neodynium and related rare earths as specimens, it was found that an unaccountable darkening of the film occurred in the region near the sample. This excessive darkening (over and above the normal amount produced by incident X-rays) was attributed to some type of back scattering of radiant energy produced by the crystalline elements composing the sample. Thus, the problem of this thesis was to carry out some simple …

Microradiography With Biological Specimens, Arthur D. Wellman

Bachelors’ Theses

Microradiography is a technique in which X-rays are directed through a very thin specimen onto a fine-grained photographic film and the image examined under magnification. It has been used chiefly as a supplementary tool in industrial analysis of metal structures, and even in this field has attained prominence only within the past decade. Its usefulness is limited to fine structures (except where minute flaws or impurities are to be examined in a material), and its success is limited by the degree of clarity in the radiograph to be magnified.