Physics Commons^™

The Mathematical Theory Of Meteorite Penetration Into Earth-Targets, Richard D. George

Physics & Astronomy ETDs

A problem in mathematical ballistics of fundamental importance in meteoritics is investigated in this thesis, namely the problem of estimating the speed at which a meteorite of assigned shape, mass and density struck a specific earth-target, either from purely theoretical considerations or from penetration or other impact-effects actually observed and measured in the earth-target.

In the second chapter several methods for calculating impact-velocities based on terminal ballistic theory are developed. While some of these methods can be successfully applied to as many as 63 recovered meteorites, others are applicable only to a very few known meteorites because of the failure …

The Thermal Conductivity Of Sodium Chloride At Elevated Temperatures, Howard Martin Brown

Masters Theses

"The thermal conductivity of solids has been attributed to a combined effect of the quantized vibration of the lattice points, called phonons, and the flow of valence electrons. In nonconductors the thermal conductivity is due almost entirely to phonons, as was shown by Debye, whereas in metals the conductivity is due mostly to the flow of valence electrons. After Debye, Peierls calculated the lattice conductivity at elevated temperatures using quantum mechanics and demonstrated that it is proportional to 1/T. There are not enough data available to substantiate any theory but what data there are seem to indicate a mixed conductivity …

Correlation Functions For Use In Small Angle X-Ray Scattering, James Edwin Thomas Jr.

Masters Theses

"Thus, the determination of the structure of the material, and obtaining a distribution function which will enable the theoretical scattering to be predicted is the major problem.

In this work the diffraction material shall be considered to contain scattering regions of identical geometrical forms at such a distance from one another that they will essentially scatter the incident beam independently of their closest neighbor. An effort will be made to determine a correlation function characteristic of these forms, which may be interpreted as a distribution function, that might allow the low angle scattering pattern to be predicted. This correlation function …