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Microdosimetric investigations at the Fast Neutron Therapy Facility at Fermilab

Description: Microdosimetry was used to investigate three issues at the neutron therapy facility (NTF) at Fermilab. Firstly, the conversion factor from absorbed dose in A-150 tissue equivalent plastic to absorbed dose in ICRU tissue was determined. For this, the effective neutron kerma factor ratios, i.e. oxygen tissue equivalent plastic and carbon to A-150 tissue equivalent plastic, were measured in the neutron beam. An A-150 tissue equivalent plastic to ICRU tissue absorbed dose conversion factor of 0.92 … more
Date: December 31, 1997
Creator: Langen, K.M.
Partner: UNT Libraries Government Documents Department
open access

Studies of structures and phase transitions in pyrrhotite

Description: This report contains a general introduction, the experimental section, general conclusions, and two appendices: using projection operators to construct the basis functions and the magnetic transition of bulk pyrrhotite samples in the low-temperature range. Four chapters have been removed for separate processing. They are: From pyrrhotite to troilite: An application of the Landau theory of phase transitions; Phase transition in near stoichiometric iron sulfide; A ordering, incommensuration and p… more
Date: March 31, 1997
Creator: Li, F.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the W and Z boson production cross sections in p {anti p} collisions at {radical}s = 1.8 TeV with the D-Zero detector

Description: This thesis reports on the measurement of the W and Z boson inclusive production cross sections ({sigma}{sub W} and {sigma}{sub Z}) times electronic branching ratios (Br(W {yields} e{nu}) and Br(Z {yields} ee)) in p{anti p} collisions at {radical}s = 1.8 TeV. The analysis is based on 12.8 pb{sup -1} of data taken in the 1992-1993 run by the D0 detector at the Fermilab Tevatron collider; the cross sections were measured to be: {sigma}{sub W} {center_dot} Br(W {yields} e{nu}) = 2. 36 {+-} 0.02 {+… more
Date: December 31, 1997
Creator: Grudberg, P.M.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the top quark mass

Description: This dissertation describes the measurement of the top quark mass m{sub t} using events recorded during a 125 pb{sup -1} exposure of the D0 detector to {radical}s=1.8 TeV {anti p}p collisions. Six events consistent with the hypothesis t{anti t} {yields} bW{sup +}, {anti b}W{sup -} {yields} b{anti l}{nu}, {anti b}l{anti {nu}} form the dilepton sample. The kinematics of such events may be reconstructed for any assumed mt, and the likelihood of each such solution evaluated. A measurement of m{sub … more
Date: December 31, 1997
Creator: Varnes, E.W.
Partner: UNT Libraries Government Documents Department
open access

Promising freeze protection alternatives in solar domestic hot water systems

Description: Since the gains associated with solar thermal energy technologies are comparatively small in relation to the required capital investment, it is vital to maximize conversion efficiency. While providing the necessary function of freeze protection, the heat exchanger commonly included in solar domestic water heating systems represents a system inefficiency. This thesis explores two alternate methods of providing freeze protection without resorting to a heat exchanger. Commonly, collectors are made… more
Date: December 31, 1997
Creator: Bradley, David E.
Partner: UNT Libraries Government Documents Department
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