Physical Sciences and Mathematics Commons^™

Flame Photometric Studies: Part A: Studies Of The Extraction And Flame Emission Of Yttrium; Part B: Droplet Size Of Aerosols In Flame Photometry; Part C: Studies Of The Reaction Zone Of An Oxygen­ Acetylene Flame, William Joseph Carnes

Doctoral Dissertations

Although the flame spectrum of yttrium has been well defined in previous work, very little information was available in regard to the effect of spectral and radiation interferences, other than the rare earths, upon the emission of yttrium. Information regarding the optimum conditions for the flame-photometric determination of yttrium was lack­ing also. The main objective of this phase of work was clarification of these points. Development of a suitable method of analysis for yttrium was also considered.

Some Reactions Of Phenothiazine And Certain Benzophenothiazines, John Charles Gilmer

Doctoral Dissertations

Summary

The consideration of the medical importance of phenothiazine derivatives and the known cancer chemotherapeutic value of the nitrogen mustards made the synthesis of some nitrogen mustard derivatives of the phenothiazines of particular interest. In the course of this research the N-{2-[bis-(2-chloroethyl)amino]ethyl} derivatives of phenothiazine, 7H-benzo[c]phenothiazine, 7H-dibenzo[c, h] phenothiazine, and 14H-dibenzo[a, h] phenothiazine were synthesized for anticancer evaluation. Also submitted to the Cancer Chemotherapy National Service Center for testing were the N-(2-chloroethyl) monofunctional nitrogen mustard derivatives of the first three phenothiazines mentioned above.

A Study Of Catalytic Reactions On Semiconductors: Hydrogen Deuterium Exchange And Formic Acid Decomposition On Chemically-Doped Germanium, George Edward Moore

Doctoral Dissertations

Summary: Rates and activation energies for the hydrogen-deuterium exchange and formic acid vapor decomposition were measured on a series of chemically-doped germanium catalyst over the temperature range 100° to 400°. The germanium catalyst were intrinsic, and n or p-type extrinsic semiconductors; the position of the Fermi level of the solid was located suitably on the forbidden energy gap.

Kinetic parameters of the exchange and decomposition reactions were related to the Fermi level (electronic chemical potential) of the solid. Their dependence suggested that the rate-limiting processes involved electronic charge shifts between adsorbate and semiconductor.

Two different rate processes appeared to …

Competitive Catalytic Hydrogenation Of Benzene, Toluene, And The Polymethylbenzenes On Platinium, Charles Phillip Rader

Doctoral Dissertations

Introduction: This investigation embraced a comparison of the relative rates of hydrogenation on platinum of benzene and several of its methyl-substituted derivatives with their relative strengths of adsorption on the active spots of the catalyst surface. It consisted of the determination of the rate of reduction of the individual hydrocarbons and a variety of their binary mixtures. Its ultimate goal was to aid in the elucidation of the mechanism by which the benzene nucleus accepts hydrogen on a platinum surface.

Operational Characteristics Of A Fission Gas Detector, Raymond Curtis Lee

Doctoral Dissertations

Introduction: One of the major problems associated with the operation of nuclear reactors is the radioactivity hazard caused by the release of fission products from the fuel. In a solid-fuel reactor, the uranium is usually present in an allow or in the form of UO₂, either in the pure state or mixed with other oxides which improve the thermal and mechanical properties of the material. As the fuel material undergoes fission in the reactor, radioactive fission products are produced. If they were not prevented from doing so, these fission products would diffuse out of the fuel material, enter …