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Thermionic converter emitter support arrangement

Description: This document discusses a support provided for use in a thermionic converter to support an end of an emitter to keep it out of contact with a surrounding collector while allowing the emitter end to move axially as its temperature changes. The emitter end is supported by a spring structure that includes a pair of Belleville springs, and the spring structure is supported by a support structure fixed to the housing that includes the collector. The support structure is in the form of a sandwich wit… more
Date: July 6, 1989
Creator: Allen, D.T.
Partner: UNT Libraries Government Documents Department
open access

A small low energy cyclotron for radioisotope measurements

Description: Direct detection of {sup 14}C by accelerator mass spectrometry has proved to be a much more sensitive method for radiocarbon dating than the decay counting method invented earlier by Libby. A small cyclotron (the cyclotrino'') was proposed for direct detection of radiocarbon in 1980. This combined the suppression of background through the use of negative ions, which had been used effectively in tandem accelerators, with the high intrinsic mass resolution of a cyclotron. Development of a small e… more
Date: November 1, 1989
Creator: Bertsche, Kirk Joseph
Partner: UNT Libraries Government Documents Department
open access

Jet Production in the Central Rapidity Region in 1.8 TeV Proton and Antiproton Collisions

Description: In this thesis we study the jet production cross section in the central rapidity region in {bar p}p collisions at a center of mass energy of 1.8 TeV. The pseudo-rapidity {eta} is defined as {eta} {triple_bond} -ln(tan({theta}/2)), where {theta} is the angle between the directions of the jet momentum and the proton beam. We will call the region -0.7 < {eta} < 0.7 the 'central rapidity' region by definition. The goal of this thesis is to determine two kinds of differential cross sections fo… more
Date: June 1, 1989
Creator: Tsai, Yeong-Dong
Partner: UNT Libraries Government Documents Department
open access

The central drift chamber for the D0 experiment: Design, construction and test

Description: A cylindrical drift chamber has been designed and built at the State University of New York at Stony Brook. This chamber is to be installed in the D0 detector which is being completed at the Fermi National Accelerator. In this dissertation the design, construction and testing of this chamber are described. The characteristic features of this chamber are cells formed by solid walls and a modular structure. Much discussion is given to the performance of and results from a chamber made from three … more
Date: August 1, 1989
Creator: Behnke, T.
Partner: UNT Libraries Government Documents Department
open access

Reaction of Tris(cyclopentadienyl)uranium compounds with amines, azides, and related ligands

Description: The trivalent uranium compound, (MeC{sub 5}H{sub 4}){sub 3}U(thf), serves as a one- or two-electron reducing agent towards azides, RN{sub 3}. These reactions produce either the uranium(IV) azide, (MeC{sub 5}H{sub 4}){sub 3}UN{sub 3}, or uranium(V) imides, (MeC{sub 5}H{sub 4}){sub 3}UNR. The role of steric and electronic effects upon this reaction has been investigated using several series of azides. For Me{sub 3}XN{sub 3}, the imides are produced when X = C or Si, both products are formed when … more
Date: December 1, 1989
Creator: Rosen, Robert Keith
Partner: UNT Libraries Government Documents Department
open access

Nuclear fuel element

Description: A nuclear fuel element and a method of manufacturing the element. The fuel element is comprised of a metal primary container and a fuel pellet which is located inside it and which is often fragmented. The primary container is subjected to elevated pressure and temperature to deform the container such that the container conforms to the fuel pellet, that is, such that the container is in substantial contact with the surface of the pellet. This conformance eliminates clearances which permit rubbin… more
Date: April 6, 1989
Creator: Zocher, R.W.
Partner: UNT Libraries Government Documents Department
open access

Vibrational state-resolved differential cross sections for the D + H sub 2 yields DH + H reaction

Description: In this thesis, crossed-molecular-beams studies of the reaction D + H{sub 2} {yields} DH + H at collision energies of 0.53 and 1.01 eV are reported. Chapter 1 provides a survey of important experimental and theoretical studies on the dynamics of the hydrogen exchange reaction. Chapter 2 discusses the development of the excimer-laser photolysis D atom beam source that was used in these studies and preliminary experiments on the D + H{sub 2} reaction. In Chapter 3, the differential cross section … more
Date: November 1, 1989
Creator: Continetti, Robert Elliot
Partner: UNT Libraries Government Documents Department
open access

Electro-catalytic Reduction of Nitrogen Oxides

Description: Nitrogen oxides have been linked to a broad range of air pollution problems including acid rain and the atmospheric production of photochemical ozone. Over twenty million tons of nitrogen oxides are emitted into the atmosphere each year as a result of the high temperature combustion of fossil fuels. Efforts to control nitrogen oxides emissions have lagged because of the generally low discharge concentrations of nitrogen oxides in combustion exhaust and because nitrogen oxides are more difficult… more
Date: December 1, 1989
Creator: McLarnon, Christopher R.
Partner: UNT Libraries Government Documents Department
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