Thesis. / Includes bibliographical references.

Thesis (Ph. D. in Chemistry)--University of California, Berkeley, June. 1956. / Titles numbered I. and II. Includes bibliographical references (leaves 88-91).

Thesis (Ph. D.)--California Institute of Technology, 1970. / Includes bibliographical references (leaves 223-230).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1968. / Typescript and manuscript. Vita. Includes reprints of several scientific articles written by the author and others. Leaf 194: "Addendum: The 1/Z Perturbation Theory of the Hooke's Law Model for the Two-Electron Atom." Description based on print version record. Includes bibliographical references.

Thesis (Ph.D.) in Mechanical Engineering--University of Maine, 2004. / Includes vita. Includes bibliographical references (leaves 91-94).

Part of Thesis (Ph. D.)--University of Michigan, 1933. / "Reprinted from the Physical review, vol. 44, no. 9, November 1, 1933."

No description available.

In a laminar model of a collisionless magnetosonic shock wave, ion equations of motion are integrated through shock-like profiles. Conservation relations and Maxwell's equations allow a self-consistent determination of unknown downstream ion distribution functions fᵢ, ion temperature Tᵢ, and electric potential jump ̧›ʺ. Favourable comparison of model Tᵢ, ̧›ʺ. Favourable comparison of model Tᵢ, ̧›ʺ , with experiment establishes (at low ̧›ư ́œø O.3, ̧›ư=8 Ï€ N [sub] l k (T[sub]é‚‚+Tᵢ[sub]l)/B́‚℗ø) importance of laminar ion dynamics. Heating is due to distortion of Maxwellian distributions when entropy is conserved; in particular shock dynamics is dominated by a fast "tail" of reflected ions. The solutions for fᵢ are considered. The "stability" of the model to its assumptions (linear profiles, shock thickness (L[sub]s)) is shown. When reflections occur a self-consistent length emerges. The solutions Tᵢ, ̧›ʺ are extensively studied at various Mach numbers for different values of ̧›ư. Laminar ion heating is very efficient and at high ̧›ư can exceed proper conservation levels due to ion reflections; at high ̧›ư(́œÆ ̧›ư *) the electric potential is unable to slow the ions to conservation levels. The model predicts significant reflected ion currents in the plane of the shock. The boundary ̧›ư * is determined. Then laminar ion dynamics on the scale of the electron heating length (~10 C/w[sub]p ́‚‘) cannot occur for ̧›ư > ̧›ư *. Dependence on L[sub]s and T ́‚‘́‚,/Tᵢ́‚ is considered. The nature of non-laminar ̧›ư >̧›ư* shocks is considered. Collisions are found to be important in laboratory shocks, and are efficient in slowing the reflected ions. In the absence of collisions, ion instabilities must be considered. It is shown that turbulent slowing of the fast ions cannot take place in L[sub]s alone. Further it is shown possible to construct a shock so that non-laminar mechanisms cannot occur significantly. Then the laminar model is re-instated. A decoupling of ion and electron heating lengths is proposed. Reflection heating in the Earth's Bow Shock (̧›ư>̧›ư*) is modelled, and is comparable with experiment.

The generally accepted, though approximate, theory of the relaxation time T₁ of the nuclear spin system in ortho H₂ at low temperatures was developed by Schwinger (see Bloembergen (1948)). In this thesis Schwinger's theory is generalized to the case of arbitrary temperatures. An expression for T₁ is obtained which reduces to the Schwinger formula at low temperatures and ordinary pressures and to a slightly modified Schwinger formula at low temperatures and low pressures. The method used here to calculate T₁ is somewhat different from the method used by Schwinger. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Methods of setting up generalized Bloch equations governing the time dependence of macroscopic magnetization for a system of nuclei of spin I, in given magnetic and electric fields, have been proposed for the degenerate case by Bloom, Hahn and Herzog and by Lureçat, and for the non-degenerate case by Bloom, Robinson and Volkoff. In this thesis an attempt is made to give a unified discussion of these methods by utilizing the density matrix formalism and to demonstrate the interrelationship between them. Relaxation effects are not considered. The general theory is developed in terms of the density matrix formalism and is applied to the non-degenerate and the degenerate cases. The results are discussed and compared with those of the previous investigators. / Science, Faculty of / Physics and Astronomy, Department of / Graduate