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U. S. China Policy During the Cold War Era (1948-1989) (open access)

U. S. China Policy During the Cold War Era (1948-1989)

In this study a comprehensive multivariate time-series model is built to explain American foreign policy toward the People's Republic of China, during the cold war era from 1948 to 1989.
Date: March 1995
Creator: Kong, Wei, 1968-
System: The UNT Digital Library
Inertial fusion energy target injection, tracking, and beam pointing (open access)

Inertial fusion energy target injection, tracking, and beam pointing

Several cryogenic targets must be injected each second into a reaction chamber. Required target speed is about 100 m/s. Required accuracy of the driver beams on target is a few hundred micrometers. Fuel strength is calculated to allow acceleration in excess of 10,000 m/s{sup 2} if the fuel temperature is less than 17 K. A 0.1 {mu}m thick dual membrane will allow nearly 2,000 m/s{sup 2} acceleration. Acceleration is gradually increased and decreased over a few membrane oscillation periods (a few ms), to avoid added stress from vibrations which could otherwise cause a factor of two decrease in allowed acceleration. Movable shielding allows multiple targets to be in flight toward the reaction chamber at once while minimizing neutron heating of subsequent targets. The use of multiple injectors is recommended for redundancy which increases availability and allows a higher pulse rate. Gas gun, rail gun, induction accelerator, and electrostatic accelerator target injection devices are studied, and compared. A gas gun is the preferred device for indirect-drive targets due to its simplicity and proven reliability. With the gas gun, the amount of gas required for each target (about 10 to 100 mg) is acceptable. A revolver loading mechanism is recommended with a …
Date: March 7, 1995
Creator: Petzoldt, R.W.
System: The UNT Digital Library
Studies of the strong and electroweak interactions at the Z{sub 0} pole (open access)

Studies of the strong and electroweak interactions at the Z{sub 0} pole

This thesis presents studies of the strong and electroweak forces, two of the fundamental interactions that govern the behavior of matter at high energies. The authors have used the hadronic decays of Z{sup 0} bosons produced with the unique experimental apparatus of the e{sup +}e{sup {minus}} Linear Collider at the Stanford Linear Accelerator Center (SLAC) and the SLAC Large Detector (SLD) for these measurements. Employing the precision tracking capabilities of the SLD, they isolated samples of Z{sup 0} events containing primarily the decays of the Z{sup 0} to a chosen quark type. With an inclusive selection technique, they have tested the flavor independence of the strong coupling, {alpha}{sub s} by measuring the rates of multi-jet production in isolated samples of light (uds), c, and b quark events. They find: {alpha}{sub s}{sup uds}/{alpha}{sub s}{sup all} 0.987 {+-} 0.027(stat) {+-} 0.022(syst) {+-} 0.022(theory), {alpha}{sub s}{sup c}/{alpha}{sub s}{sup all} = 1.012 {+-} 0.104(stat) {+-} 0.102(syst) {+-} 0.096(theory), {alpha}{sub s}{sup b}/{alpha}{sub s}{sup all} = 1.026 {+-} 0.041(stat) {+-} 0.030(theory), which implies that the strong interaction is independent of quark flavor within the present experimental sensitivity. They have also measured the extent of parity-violation in the Z{sup 0} c{bar c} coupling, given by the parameter …
Date: March 1, 1995
Creator: Hildreth, M.D.
System: The UNT Digital Library
Recycling Culture and Media (open access)

Recycling Culture and Media

A comparison of classical and contemporary cultures was made by recreating classical sculptural imagery in contemporary recyclable materials. I proposed to use the detritus of modern culture to render sculpture that was ancient in subject, stance, and scale. The intention of this work was to create a visual discourse between cultures by bringing together elements of each, showing points of congruence and disparity.
Date: March 1995
Creator: Drew, Robert S.
System: The UNT Digital Library