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Articles 8971 - 9000 of 9199
Full-Text Articles in Physical Sciences and Mathematics
Phase Changes In Solid Cyclohexanol, William T. Griffith
Phase Changes In Solid Cyclohexanol, William T. Griffith
Physics & Astronomy ETDs
Cyclohexanol is one of a group of organic compounds which exist in a “plastic crystal" solid phase, which is intermediate in its properties between the liquid phase and the solid phases stable at lower temperatures. It has been well established that the odd properties of the plastic crystal phase are due to the relatively unhindered rotation of the molecules about their lattice positions. At temperatures often considerably below the freezing point, these compounds undergo a solid-solid phase transformation in which this rotational freedom is lost. The heats and entropies of transformation at this lower transition point are generally larger than …
The Effect Of Cesium Vapor On The Emission Characteristics Of Uranium Carbide At Elevated Pressures, Philip W. Kidd
The Effect Of Cesium Vapor On The Emission Characteristics Of Uranium Carbide At Elevated Pressures, Philip W. Kidd
Physics & Astronomy ETDs
The saturated emission current from uranium carbide in the presence of cesium vapor were measured for four different bath temperatures: 167˚C, 197˚C, 227˚C, and 250˚C (the cesium arrival rates μa, in atoms/cm2, were 3x1018, 1x1019, 3x1019 and 6x1019). The measurements were made with a “plasma anode” type tube immersed in a constant temperature oil bath. The design of the tube is shown, and the electronic circuitry is given with an explanation of the method of measurement. The experimental data for “electron emission vs 1000/T” was plotted for the experimental …
A Study Of Satellite Amplitude Scintillation And Its Correlation With Radio Star Scintillation, William Beeuwkes Shuler
A Study Of Satellite Amplitude Scintillation And Its Correlation With Radio Star Scintillation, William Beeuwkes Shuler
Dissertations, Theses, and Masters Projects
No abstract provided.
Scintillation In The Ionosphere, M. Patrick Mccormick
Scintillation In The Ionosphere, M. Patrick Mccormick
Dissertations, Theses, and Masters Projects
No abstract provided.
Solar Cycle Effects On Inner Belt Protons, Robert C. Blanchard
Solar Cycle Effects On Inner Belt Protons, Robert C. Blanchard
Dissertations, Theses, and Masters Projects
No abstract provided.
Solar Radiation, Gloucester Point, Virginia : [1960-1963], Bernard C. Patten, J. Ernest Warriner, Weston Eayrs, Charles L. Rutherford, D. K. Young, Richard B. Stone, Virginia Fisheries Laboratory
Solar Radiation, Gloucester Point, Virginia : [1960-1963], Bernard C. Patten, J. Ernest Warriner, Weston Eayrs, Charles L. Rutherford, D. K. Young, Richard B. Stone, Virginia Fisheries Laboratory
Reports
No abstract provided.
Neuron-Proton Scattering At 23.6 Mev, Jerome G. Beery
Neuron-Proton Scattering At 23.6 Mev, Jerome G. Beery
Physics & Astronomy ETDs
The angular distribution for neutron-proton scattering was measured at a neutron energy of m3.6 MeV. The measurement was made using the Los Alamos Variable Energy Cyclotron and a liquid hydrogen bubble chamber. The angular distribution was normalized to a total n-p cross section of 408 mb.
Application Of Shower Theory To High Energy Total Absorption Čerenkov Radiation Counter, Frederick Young
Application Of Shower Theory To High Energy Total Absorption Čerenkov Radiation Counter, Frederick Young
Physics & Astronomy ETDs
Theoretical calculations describing the performance of a Čerenkov counter designed as a total absorption gamma ray spectrometer for the energy range 100-1000 Msv are presented, using approximation "A" from the standard shower theory, and R. Wilson's quasi-analytical method of cascade shower analysis.
Study Of Fission Neutron Spectra With High-Energy Activation Detectors, James A. Grundl
Study Of Fission Neutron Spectra With High-Energy Activation Detectors, James A. Grundl
Physics & Astronomy ETDs
The energy spectra of neutrons from the fission of U235, U233, and Pu239 have been studied with seven high-energy activation detectors covering the range 0.6 to 16 Mev. Interpretation is in terms of the Maxwellian spectral function E1/2 exp(-E/T). By means of a unique cavity arrangement within a moderator to obtain pure thermal-neutron-induced fission neutrons, the average energies of the three spectra are found to be in the ratios
U235: U233: Pu239= (1): (1.016+or-0.003): (1.039+or-0.003).
Differences between the normalized spectra are most pronounced at high energies as exemplified by the relative Pu239:U235 flux ratios 1.17+or-0.013 for 611 Mev.
The Diffraction Of Polarized Light From A Laser By A Straight Edge, Robert Lawrence Berger
The Diffraction Of Polarized Light From A Laser By A Straight Edge, Robert Lawrence Berger
Physics & Astronomy ETDs
The purpose of this experiment was to determine the effect of the polarized light from a highly coherent light source on the diffraction pattern of a metallic straight edge.
Review Of The Physical Aspects Of Osmotic Pressure, Joseph F. Goffaux
Review Of The Physical Aspects Of Osmotic Pressure, Joseph F. Goffaux
Physics & Astronomy ETDs
It should be mentioned that this paper deals mostly with the work done by others and only a certain portion is original. The student wishes to state that he is presenting a thesis that would be considered theoretical and not empirical. The history of the work done in the field of osmotic pressure is treated at length and much of the theory used by the experimenters is derived. Many periodicals carry the papers written by the scientists of osmotic pressure and some of these men have spent perhaps fifteen of twenty years on their experiments.
A Correlation Between The Responses Of A Cherenkov Counter, And A Liquid Scintillator, To An Extensive Air Shower, John Wolcott
A Correlation Between The Responses Of A Cherenkov Counter, And A Liquid Scintillator, To An Extensive Air Shower, John Wolcott
Physics & Astronomy ETDs
To date there have been no adequate measurements of the energy spectrum of high energy cosmic gamma-rays. This information can only be obtained from instrumentation located above the atmosphere. An experiment has been designed by Dr. Leavitt at the University of New Mexico to obtain this information. It is to be orbited in the S-17 Orbiting Solar Observatory.
Fast Neutron Induced Fission Of U238, Michael J. Bennett
Fast Neutron Induced Fission Of U238, Michael J. Bennett
Physics & Astronomy ETDs
This work describes an experimental study of the energetics of the fission of U238 performed with solid state detectors. The fissions were produced by fission-spectrum neutrons from a reactor. The procedure used for calibrating the detector response is described and the effects of some experimental uncertainties, such as pulse height defect and neutron emission, are discussed.
A Theoretical And "Experimental" Investigation Of One-Dimensional Molecular Distribution Functions, Samuel Blackman
A Theoretical And "Experimental" Investigation Of One-Dimensional Molecular Distribution Functions, Samuel Blackman
Physics & Astronomy ETDs
The presence of long range forces and of various types of boundary conditions may be expected to cause deviations from the well known Maxwell-Boltzmann velocity distribution, resulting in a spatially dependent velocity distribution. One possible method for obtaining a theoretical spatially dependent velocity distribution is to attempt an approximate solution for Liouville's equation. This is done in this thesis. The effects of a long range repulsive force inversely proportional to the interparticle separation as well as the effects of three types of wall boundary conditions upon the velocity distributions of a one-dimensional set of ordered particles have also been investigated …
A Radio Frequency Power Oscillator And Impedance Matching Device., Charles D. Preston
A Radio Frequency Power Oscillator And Impedance Matching Device., Charles D. Preston
Physics & Astronomy ETDs
Certain molecules, called “globular” molecules, when first solidified form what are called “plastic” crystals. They are called “globular” either because they may exhibit an approximate spherical symmetry about their center of structure or because they may be small enough or of such a shape as to appear spherically symmetric because of rotation. The first case might be exemplified by methane (CH4) which has the configuration of a regular tetrahedron. The second case might be exemplified by hydrogen chloride (HCL).
A Transister Quenching Circuit For Geiger Counter Tubes, Andrew M. Simko
A Transister Quenching Circuit For Geiger Counter Tubes, Andrew M. Simko
Physics & Astronomy ETDs
This thesis attempt to provide a solution to a basic problem inherent in the operation of Geiger-Mueller counting tubes, that is, reduction of the insensitive time, or “dead time”, following the discharge. Many researchers, using various quenching gases for internal quenching and various vacuum tube circuits for external quenching, have succeeded in reducing the “dead time” significantly. Reduction of the insensitive time provides more efficient and accurate counting. The solutions presented in this thesis utilize transistor circuits instead of vacuum tube circuits for external quenching. In an extensive research of current literature, no attempts to transistorize a quenching circuit could …
A Proposed Modification Of The Available Momentum Region In Thomas-Fermi Theory, John F. Barnes
A Proposed Modification Of The Available Momentum Region In Thomas-Fermi Theory, John F. Barnes
Physics & Astronomy ETDs
The statistical model of the atom, first propounded by Fermi and Thomas has proved a most useful approximation to the self-consistent field method in calculating electron distributions and fields in atoms. Because of its relative simplicity, it has found wide application as a means of predicting properties of free atoms and of solids. The original theory has been the subject of many modifications and refinements, some of which are reviewed in this paper.
Rocket Observations Of The Earth's Limb, Thomas B. Mckee
Rocket Observations Of The Earth's Limb, Thomas B. Mckee
Dissertations, Theses, and Masters Projects
No abstract provided.
On The Problem Of Radio Signal Attenuation During Hypervelocity Reentry, David Joseph Romeo
On The Problem Of Radio Signal Attenuation During Hypervelocity Reentry, David Joseph Romeo
Dissertations, Theses, and Masters Projects
No abstract provided.
Diurnal And Seasonal Variations Of Satellite Scintillation, John David Martin
Diurnal And Seasonal Variations Of Satellite Scintillation, John David Martin
Dissertations, Theses, and Masters Projects
No abstract provided.
Wind-Tunnel Measurements Of The Aerodynamic Damping And Oscillatory Stability In Pitch Of A Sphere At Mach Numbers From 0.20 To 4.63, Robert Ashworth Kilgore
Wind-Tunnel Measurements Of The Aerodynamic Damping And Oscillatory Stability In Pitch Of A Sphere At Mach Numbers From 0.20 To 4.63, Robert Ashworth Kilgore
Dissertations, Theses, and Masters Projects
No abstract provided.
The Leakage Neutron Spectrum Of A Spherical Critical Assembly Of U233, Larry E. Bobisud
The Leakage Neutron Spectrum Of A Spherical Critical Assembly Of U233, Larry E. Bobisud
Physics & Astronomy ETDs
In this paper the spectrum of the neutrons escaping from a critical sphere of U233 is investigated experimentally and theoretically. The experimental investigation involved exposing a nuclear emulsion to the neutron flux and, after development, examining the details of the proton-recoil tracks visible in the emulsion.
On The Velocity Of Sound In Cubic Crystals, Stuart Fleming Hayes
On The Velocity Of Sound In Cubic Crystals, Stuart Fleming Hayes
Physics & Astronomy ETDs
The object of this inquiry is to examine the relation between plane wave sound velocities in cubic crystals and the elastic constants of such crystals. Leading directly into this an extensive treatment of the classical theory of elasticity as it pertains to the cubic system. An application of the results will be made by detailing a means for obtaining the elastic constants of plastic single-crystals from measurements of velocity made on poly crystalline specimens.
The Time Required For Nuclear Fission, William Earn Stein
The Time Required For Nuclear Fission, William Earn Stein
Physics & Astronomy ETDs
The present work is concerned with the mean lifetime of compound nuclei formed in the fast-neutron-induced-fission process. A new method for the measurement of these lifetimes is proposed. The present method is based on the recoil of the compound nucleus following neutron capture and the secondary electrons emitted by fission fragments. Previous experimental and theoretical work concerning the secondary electron yields for fission fragments and other charged particles are reviewed. The importance of the higher energy electrons, the so-called delta rays, formed in the primary ionization process is considered. The subsequent secondary ionization produced by these delta rays provirles a …
The Energy Spectrum Of Gamma Rays Produced In Interstellar Matter By The Primary Cosmic Rays, Duquesne A. Wolf
The Energy Spectrum Of Gamma Rays Produced In Interstellar Matter By The Primary Cosmic Rays, Duquesne A. Wolf
Physics & Astronomy ETDs
With the advent of the launching of space exploration in the last decade there has been parallel scientific effort to determine the nature of cosmic radiation found in space.
This theoretical study has the objective of determining the energy spectrum of gamma rays produced in interstellar matter by the primary cosmic rays.
The He3 + T Reactions., Darryl B. Smith
The He3 + T Reactions., Darryl B. Smith
Physics & Astronomy ETDs
The energy distribution of the alpha particles and of protons frim the He3+ t reactions have been measured for 1.9-Mev incident tritons at laboratory angles of 30° for alpha, and both 30° and 90° for protons. Absolute cross selections are obtained. The spectra are discussed in terms of a model which assumes that uncorrelated three-body breakup and several two-stage processes all contribute independently to the cross section. The calculations based on this model are in excellent agreement with the observed spectral shapes. The neutron-proton correlation corresponding to the unbound singlet state of the deuteron is observed. The binding energy of …
Multiple Scattering Of High Energy Electrons In A Cerenkov Counter, John Rehnberg
Multiple Scattering Of High Energy Electrons In A Cerenkov Counter, John Rehnberg
Physics & Astronomy ETDs
The purpose of this thesis is to present a procedure for calculating the fraction of high energy electrons incident on a Cerenkov counter which are scattered out of the region of detection.
With the assistance of Professor Christopher P. Leavitt of the University of New Mexico, a method of solving the above problem has been established. The method uses the theory of multiple scattering as described by Rossi and Greisen and a numerical integration technique to evaluate the effective or average scattering distribution function for the Cerenkov counter. A relationship is developed which can be programmed on a Bendix G-15 …
Calibration Of A Liquid Scintillator With Geiger-Mueller Counters, William F. Hartman
Calibration Of A Liquid Scintillator With Geiger-Mueller Counters, William F. Hartman
Physics & Astronomy ETDs
It was the purpose of this experiment to examine the difference in the density determinations and, since the Geiger tube threshold is much lower, to calibrate the liquid scintillator so that it is capable to determining the absolute particle density with greater accuracy.
Diffraction Of Spherical Scalar And Vector Waves At Axial Points Of A Circular Aperture And Disk, Keith Leon Mcdonald
Diffraction Of Spherical Scalar And Vector Waves At Axial Points Of A Circular Aperture And Disk, Keith Leon Mcdonald
Faculty Publications
The following work treats Kottler's saltus problem of diffraction of electromagnetic waves emitted by a Hertzian oscillator source and the analogous Kirchhoff's scalar problem of waves emitted by a point source. The medium is a homogeneous isotropic dielectric. In the vector case a new exact solution of the basic integrals is presented, at axial points only, (a) behind a circular aperture in a "black'' screen, and (b) behind its complementary "black'' disk. The relative time-averaged intensity of energy flow is plotted for the disk only. It is shown that the scalar theory predicts considerably larger values than the electromagnetic theory …
A Telemetric Compass, Paul Nelson Jr.
A Telemetric Compass, Paul Nelson Jr.
Physics & Astronomy ETDs
In certain types of experiments involving balloon-borne equipment it is desirable to know how the orientation of the apparatus varies with time. The author has investigated a method of telemetering azimuthal orientation from a balloon to the ground, and has constructed a protoype of a telemetering magnetic compass. The basis of the compass is a rotating-ring magnetometer of the type first described by Nielsen (1) and used by others (2,3,4) for various purposes. The output of this device consists of two a.c. signals, whose relative phase is determined by the orientation of the magnetometer with respect to the external magnetic …