Physical Sciences and Mathematics Commons^™

Diffusional Drop Growth In A Supersaturated Atmosphere, John C. Carstens

Doctoral Dissertations

"The effect which a growing droplet has on the supersaturated atmosphere surrounding it is analyzed by assuming a macroscopic diffusional growth mechanism involving both heat and vapor. The problem is solved, for cloud-chamber conditions, first for very short times assuming a fixed radius, and then for longer times assuming the establishment of "quasi" steady-state conditions. Knowledge of the way in which droplet growth affects supersaturation is important in the evaluation of nucleation rates"--Abstract, page ii.

Dynamics Of Disordered Harmonic Lattices, Daniel N. Payton Iii

Doctoral Dissertations

"Extensive numerical and analytic studies of vibrational spectra, normal modes, thermodynamic properties, and dynamical properties of harmonic systems with varying degrees of substitutional disorder have been made. The effects on observable properties of random mixtures of two or more species of atoms with differing masses and differing couplings to nearest-and next-nearest-neighbors have been investigated. Using the IBM-7030 digital computer, spectra for linear chains of 100,000 atoms have been obtained. Calculations in two and three dimensions have been limited to arrays of approximately 1000 atoms. Varying composition, mass ratio, and order affect the spectra in two and three dimensions in ways …

Charged Particle Fluxes In The South Atlantic Radiation Anomaly, Nicholas S. P. King

Physics & Astronomy ETDs

Data from a scintillator and two Cerenkov counters aboard the 0S0-B2 satellite are converted from counting rates to omnidirectional fluxes in the South Atlantic Radiation Anomaly. Isointensity contours are obtained for the anomaly with omnidirectional fluxes being of the order of 90 protons/cm2 -sec and 5 x 10 3 electrons/cm2 -sec. The South Atlantic Radiation Anomaly is postulated to include an electron dump into the earth's atmosphere due to the observed differences between the isointensity distributions for protons and electrons.

The Structure Of The Vibrational Relaxation Zone Of Shock Waves In Oxygen, Robert W. Lutz

Physics & Astronomy ETDs

The vibrational relaxation of pure oxygen has been studied in incident shock waves in the temperature range l000-3700° K. The re­laxation process was observed by measuring density gradients in the relaxation zone with the quantitative laser schlieren technique. The high sensitivity of this technique allowed determination of the relaxation time T, defined by the Bethe-Teller equation

= [ E - E ],

as a function of temperature and pressure in the relaxation zone. The variation in P the relaxation time at one atm, during th individual experiments, was found to agree with the over-all temperature dependence derived from the entire …

An Experimental Study Of The Rate Of Evaporation Of Water Droplets., Pyung Syk Ro

Physics & Astronomy ETDs

The basic equation (Maxwell equation) for the evaporation rate of small droplets motionless relative to the ambient gas is verified by our experiment using an ultrasonic droplet suspension device. By using an ultrasonic device, a good approximation to the conditions of evaporation of free water droplets ranging from 0.4 mm to 2.0 mm in diameter is obtained.

Since it is expected that the back-scattering cross section of an incoherent light beam from a water drop is proportional to the square of the radius of the water drop, the possibility of measuring evaporation rates by using incoherent light is suggested. This …

Re-Evaporation Nuclei And Evaporation In A Wilson Cloud Chamber, James G. Smith

Doctoral Dissertations

"Experimental techniques are developed for observing droplet evaporation in the submicroscopic size range. An expansion-compression cloud chamber with an atmosphere of tank helium saturated with water vapor is employed. This work was undertaken with the aim of examining submicroscopic droplet behavior and the existence of re-evaporation nuclei, a form of memory effect.

The theories of evaporation and nucleation on submicroscopic drop residues were re-examined, and alterations which appear to be consistent with the results of this work were incorporated into the evaporation theory.

The observed continually decreasing evaporation rate with diminishing droplet size confirms the existence of re-evaporation nuclei, but …

Design And Construction Of A Pulsed Glass Laser, Mostafa Ibrahim Azab

Archived Theses and Dissertations

No abstract provided.

Radiation Damage Studies Of Libyan Desert Silica Glass, Farkhonda Hassan

Archived Theses and Dissertations

No abstract provided.

An Investigation Of The Control Of Hydraulic Fracturing Through The Inclusions Of Prefractures, William Joseph Kabeiseman

Doctoral Dissertations

"Among the methods for determining the in-situ state of stress within the earth’s crust, hydraulic fracturing has been and is receiving much attention. This method, in principle, measures stress directly with no delicate electronic equipment required nor knowledge of the elastic modulus of the material.

This dissertation investigates experimentally whether or not control of fracture orientation can be achieved by the introduction of circular and elliptical prefractures along with sand inclusions into cast hydrostone blocks which are hydraulically fractured. A mathematical model is presented and analytically solved for the stress condition associated with a circular crack containing fluid pressure with …

Calculated Cohesive Energy Of The Ordered Copper-Gold Alloy Cu Au I, Richard W. Hannum

Doctoral Dissertations

"The ordered alloy CuAu is the fifty atomic per cent alloy in the copper-gold system. It was observed by Johansson and Linde(1) and was one of the first ordered alloys to be studied by x-ray diffraction methods(Z, 3). Two ordered superlattices of CuAu are observed. CuAu I exists below 380° C and has a tetragonal structure which is a slight distortion of the face- centered cubic. It is very highly ordered, with all copper and all gold atoms in alternate (002) planes, as shown in Figure 2. CuAu II, which exists between 380° and 415° C, is orthorhombic in structure(4) …

Absolute Soft X-Ray Dosimetry For Radiation Chemistry Studies, Howard Sajon Joyner

Masters Theses

"A homogeneous, variable plate separation ion chamber consisting of a polyethylene body and employing flowing ethylene as the cavity gas has been designed and tested for the specification soft x-ray (<75kV) energy deposition in typical hydrocarbons. The variable plate separation feature provided primary data on the differential specific ionization originating within the cavity gas occupying the effective collector volume which is independent of inherent chamber inhomogeneities associated with the electrically conducting films comprizing the chamber electrodes. These data demonstrated that charged particle equilibrium is established within the first few ten thousandths of an inch in typical solid hydrocarbons irradiated with this class of sources. Comparison of this type of chamber with a fixed plate separation, static cavity gas mode of operation showed that the latter may predict dose rates with inherent errors exceeding 100%. With the quality of electronic readout accessories presently available, the variable plate separation chamber yielded dose rate data exhibiting a probable error of 3.8 percent (plus the unknown uncertainty in the literature data on the energy required to form an ion pair), and an ultimate limiting error of less than 2 percent appears feasible"--Abstract, page ii.

Changes In Minority Carrier Lifetime In Silicon And Gallium Arsenide Resulting From Irradiations With 22- And 40-Mev Protons, Marvin E. Beatty

Dissertations, Theses, and Masters Projects

No abstract provided.

The Electrical Resistivity Of Different Types Of Glasses, Fadel Youssef Iskandar Assabghy

Archived Theses and Dissertations

No abstract provided.

Ferrimagnetic Structure Of Magnetoelectric Ga2-XFeXO3, Richard B. Frankel, N. A. Blum, S. Foner, A. J. Freeman, M. Schieber

Physics

No abstract provided.

The Calculation Of The Cross-Section Of The Interaction Between Two Yang-Mills Fields, Richard A. Starr

Masters Theses

The Problem and Its Background

This thesis presents a study of the interaction between two arbitrary fields, named Yang-Mills fields¹ for their originators. The basic equations for the calculations of the Yang-Mills interaction are due to modern quantum field theory and its specific application to quantum electrodynamics.²

Much useful information can be obtained from the formulation of the dynamical equations for a classical system: for example, the classical description of the electromagnetic field, based on Maxwell's equations, leads to wave concepts. Then using this formalism as a starting point, one can proceed to the quantum theory of free …

Phase Shift Analysis Of Protons Elastically Scattered By 016 Near EP = 8.3 Mev, Glenn D. Westin

Masters Theses

Chapter I

Introduction

The study of the resonances in the scattering cross section of the p + O¹⁶ reaction can reveal information regarding the energy levels of the compound nucleus F¹⁷. The analysis is simplified because of the zero spin of the O¹⁶ nucleus. Also, the low binding energy of the proton added to O¹⁶ allows examination of the low-lying energy levels in F¹⁷.¹ The reaction has been intensively investigated at the University of Wisconsin in a series of experiments using an electrostatic accelerator as a source of protons.

Cerium Magnesium Nitrate Temperature Scale From Nuclear Orientation, Richard B. Frankel, D. A. Shirley, N. J. Stone

Physics

Systematic deviations were found below 0.003°K in the temperature dependence of nuclear orientation of Ce^137m in cerous magnesium nitrate, using the temperature scale proposed by Daniels and Robinson. The temperature scale below 0.006°K was redetermined using a new method: nuclear orientation. This has the advantage over the 'Y-ray heating method of high sensitivity at the lowest temperature. The most striking result is hat a value of 1/T of 520, rather than the previously accepted 324, is obtained by demagnetization from initial condItions of 18.8 kG deg^-1. The useful absolute temperature range is thus extended by …

Nuclear Magnetic Relaxation And Diffusion In Paraffin Oil, David E. Parker

Masters Theses

Introduction

Since the introduction of the spin echoes technique by E. L. Hahn¹ many studies have been made in the determination of the spin relaxation T₂, spin-lattice relaxation T₁, and the diffusion rates in gases, liquids^2-5, and solids^6-10. Hahn's methods were later improved by Carr and Purcell¹¹. The Carr-Purcell method serves as the basic technique for this study.

Several studies have been published on the relaxation and diffusion rates in hydrocarbons¹². These studies have shown:

1. The spin relaxation time T₂, is independent of the …

A Theoretical Study Of Light Scattering From Water Droplets., Aaron J. Cox

Physics & Astronomy ETDs

No abstract provided.

On The Scintillation Of Stars., Mary Elizabeth Prince Phelan

Physics & Astronomy ETDs

The nature of stellar scintillation is important to the astronomer and to the atmospheric physicist, but little quantitative work has been done in this area. This paper describes the results of an objective study of stellar scintillation. The principle measurements were concerned with a determination of the scintillation pattern and rate of a star which was observed simultaneously in two photoelectric telescopes whose distance could be varied. Other items measured included variations in rate of scintillation with: stellar magnitude, stellar altitude, atmospheric changes, and time of evening.

Measuring Spin-Lattice Relaxation Times With A Super-Regenerative Spectrometer, Alfred C. Rester Jr.

Physics & Astronomy ETDs

Nuclear quadrupole resonance is a branch of radio frequency spectroscopy which was discovered in 1950 by Dehmelt and Kruger. (1). It is concerned with radio-frequency magnetic resonance absorption in molecular crystals. It results from the interaction of the nuclear quadrupole moment with the electric field gradient of the molecule charge cloud surrounding the nucleus. Different orientations of the nuclear axis relative to the field axis correspond to different energy levels. Resonance absorption takes place when an applied electromagnetic field cause transitions from one energy level to a higher one.

Ultrasonic Suspension Of Liquid Droplets For Light Scattering Studies, David L. Cutchin

Physics & Astronomy ETDs

The construction and operation of an ultrasonic liquid droplet suspension device are described. The problem of generating intense sonic waves by matching the sonic transducer components is investigated. There is a description and analysis of a light scattering experiment performed on a suspended water droplet. The moat prominent characteristic of the scattered light was a rapid (10 to 100 cycles per second) time fluctuation in intensity. The variation in scattering cross section with droplet diameter predicted by the Mie theory and droplet shape oscillations are investigated as possible mechanisms producing the fluctuations.

An Investigation Of Neutron Collimators And Their Application In Neutron Radiography., Roger A. Morris

Physics & Astronomy ETDs

One of the most important diagnostic tools in the fields of medicine and industry is the use of penetrating radiation to detect flaws, inhomogeneities, and abnormal conditions within an object without permanently changing or destroying the object being inspected. The equipment, technique, and type of radiation employed vary widely between hospital, shop, or laboratory depending upon the particular conditions that are encountered and the results that are expected. Probably the most widely used radiation types are X-rays or gamma-rays and their applications in the above-mentioned fields need no further description. However, beams of thermal neutrons are becoming more and more …

Ua77/1 Alumni Bulletin, Vol. 32, No. 2, Wku Alumni Association

WKU Archives Records

Alumni newsletter published by WKU. This issue has the following articles:

• President Kelly Thompson Announces Master Plan
• Western to Offer Graduate Degree Program in Engineering Physics
• Summer Session Slated to Open on June 14
• Robertson, Lee. From the Alumni Office
• Class of 1915
• Class of 1925
• Class of 1940
• Class of 1955
• Class of 1964
• Sports in Brief
• William Solly Becomes New Physical Education Head
• Graduate Assistantships Now Available
• James McKee Joins Education Department
• On the Calendar
• Commencement Day Activities

Frederic Joliot-Curie And Atomic Energy By Pierre Biquard Pp. 109-211, Donald Printest Watkins

Honors Theses

This is a translation of pages 109-211 of the biography Frederic Joliot-Curie Et L'energie Atomique by Pierre Biquard.

Sign Change Of Induced Hyperfine Fields In The 5p Shell, Richard B. Frankel, J. J. Huntzicker, E. Matthias, S. S. Rosenblum, N. J. Stone

Physics

No abstract provided.

Width Of Ion And Monopole Tracks In Emulsion, Robert Katz, J. J. Butts

Robert Katz Publications

The width of the tracks of ions in emulsion has been calculated from the assumption that a developable image is formed when the energy dosage deposited by delta rays exceeds a threshold value, here found to be 6000 ergs/cm² in G-5 emulsion. The theory agrees with measurements of track width obtained by projecting track images to a magnification of 3000× and tracing around their outline, while truncating isolated delta rays at their bases. Agreement is to within a grain diameter to a range of about 4 cm. From the theory we infer that there is no Z intelligence contained …

The Discovery Of Quantum Mechanics, Patrick A. Heelan

Research Resources

In this chapter Heelan discusses how Heisenberg's insight of 1925, that physics should concern itself henceforth only with relations between observables, changed the intentionality-structure of physics. This insight led Heisenberg to the construction of a quantum mechanics of observables. Heelan briefly discusses the significance of his insighand of his rejection of Schrödinger's wave mechanics; the novelty of quantum mechanics as a physical theory, and the meaning he attributed to its most surprising result, viz., the Indeterminacy Relations. The crisis was a crisis of the rationalism inherent in the outlook of classical physics, and Heisenberg's insistence on "observable quantities" was a …

The Intentionality Structure Of Complementarity, Patrick A. Heelan

Research Resources

In this article Heelan argues that the return to the concrete and empirical implied in Heisenberg's insight on the importance of observables in physics was not, however, in Heisenberg's case, accompanied by a thorough re-thinking of the rationalist presuppositions of classical physics. The effect on Bohr, however, was to lead him to a complete rejection of rationalism and to the adoption of the contrary extreme, empiricism. The profound – though largely implicit – cause of the disagreement between Bohr and Heisenberg as to the correct interpretation of quantum mechanics, was resolved in the sumnler of 1927, by the common acceptance …

New Autoionizing Levels In Helium, M. Eugene Rudd

M. Eugene Rudd Publications

We recently reported the excitation of autoionizing states in helium by positive-ion bombardment and their subsequent observation as fine structure in the energy spectrum of the emitted electrons. With somewhat increased resolution we have now observed additional levels in helium including parts of two series not previously reported.