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Expulsion of Carriers from the Double-Barrier Quantum Well and Investigation of Its Spectral and Transport Consequences

Description: In this work I investigate the expulsion of carriers from nanostructures using the double-barrier quantum well (DBQW) as an example and discuss manifestations of this effect in the spectrum of the DBQW in absence of bias, and in the tunneling current in presence of bias. Assuming equality of the Fermi energy in all regions of the considered system, I compute the relative density of carriers localized in the DBQW and conclude that a fraction of carriers is expelled from this nanostructure.
Date: March 1992
Creator: Chyla, Wojciech Tadeusz
Partner: UNT Libraries
open access

Prospective Memory and College Students: Validation of the Wood Prospective Memory Test

Description: This study provides information regarding the validity and reliability of the Wood Prospective Meory Test (WPMT), a newly developed test consisting of three main subscales intended to measure prospective memory. Subjects were 69 college students (50 female, 19 male, age range 18-24), who were administered several memory tasks including the WPMT.The results of this study suggest that the subscales of the WPMT do not have sufficient internal reliability (.50, .60, and .44), and therefore, would b… more
Date: March 1992
Creator: Rowe, Christina J.
Partner: UNT Libraries
open access

Chemisorption and catalytic reactivity of cobalt and sulfur monolayers on ordered molybdenum surfaces

Description: Complex Co/Mo sulfide catalysts are modelled by the chemisorption of layers on Mo single crystal surfaces. Growth and structure of overlayers on flat, stepped and kinked surfaces were investigated. Growth of Co overlayers on clean and S covered Mo surfaces was studied using AES and CO chemisorption; results reveal that Co grows as a flat monolayer on clean Mo surfaces. Co multilayers then form 3-D islands. When Co is deposited on S covered surfaces, the S overlayer migrates to the top; this top… more
Date: March 1, 1992
Creator: Knight, C. C.
Partner: UNT Libraries Government Documents Department
open access

Signal and noise analysis of a-Si:H radiation detector-amplifier system

Description: Hydrogenated amorphous silicon (a-Si:H) has potential advantages in making radiation detectors for many applications because of its deposition capability on a large-area substrate and its high radiation resistance. Position-sensitive radiation detectors can be made out of a 1d strip or a 2-d pixel array of a Si:H pin diodes. In addition, signal processing electronics can be made by thin-film transistors on the same substrate. The calculated radiation signal, based on a simple charge collection … more
Date: March 1, 1992
Creator: Cho, Gyuseong
Partner: UNT Libraries Government Documents Department
open access

Implantation of carbon in GaAs

Description: Carbon implanted into GaAs and thermally annealed typically exhibits very low (<3%) electrical activity. It has been demonstrated that the electrical activity of C can be significantly enhanced by co-implantation with Ga. Improved activation may result from either additional damage of the crystal lattice or from stoichiometric changes, forcing the C atoms onto As sites. To determine the relative importance of each of these effects, I have undertaken a systematic study of carbon activation in Ga… more
Date: March 1, 1992
Creator: Moll, A. J.
Partner: UNT Libraries Government Documents Department
open access

Application of photothermal deflection spectroscopy to electrochemical interfaces

Description: This dissertation discusses the theory and practice of Photothermal Deflection Spectroscopy (PDS, which is also known as probe beam deflection spectroscopy, PBDS, probe deflection technique, and mirage effect spectroscopy) with respect to electrochemical systems. Much of the discussion is also relevant to non-electrochemical systems. PDS can measure the optical absorption spectrum of interfaces and concentration gradients in the electrolyte adjacent to the electrode. These measurements can be m… more
Date: March 1, 1992
Creator: Rudnicki, J. D.; McLarnon, F. R. & Cairns, E. J.
Partner: UNT Libraries Government Documents Department
open access

An economic analysis of recordable injuries at Martin Marietta Energy Systems, Inc.

Description: The William-Steiger Occupational Safety and Health Act (OSHA) was passed by the Congress and signed by the President of the United States in 1970. This law required all companies with more than 25 employees to maintain information about each recordable injury, which is defined as any occupational illness or any work-related injury requiring more extensive treatment than first aid. However, compliance with OSHA standards did not require employers to keep records regarding the costs of recordable… more
Date: March 1, 1992
Creator: Johnson, E. K.
Partner: UNT Libraries Government Documents Department
open access

Search for doubly Cabibbo suppressed decays of the charged D meson

Description: The doubly Cabibbo suppressed decayed D{sup +} {yields} K{sup +}{pi}{sup {minus}}{pi}{sup +}, D{sup +} {yields} K{sup +}{pi}{sup 0}and D{sup +} {yields} K*{sup +}{pi}{sup 0} are searched for in a 9.56 pb{sup {minus}1} data sample of e{sup +}e{sup {minus}} annihilation events collected near the {psi}(3770) resonance with the Mark 3 detector at the SPEAR storage ring, at the Stanford Linear Accelerator Center. These rare weak decays are naively expected at a rate of tan{sup 4}{theta}{sub c} relat… more
Date: March 1, 1992
Creator: Labs, J. F.
Partner: UNT Libraries Government Documents Department
open access

Feasibility of an antiproton catalyzed fission fragment rocket

Description: The purpose of this project was to investigate the feasibility of an antiproton catalyzed fission fragment rocket (FFR). The FFR is characterized by the extraction of fission fragments from the fissile fuel, and the utilization of their kinetic energy for thrust generation. A significant drawback to previous FFR designs was the requirement to maintain a critical nuclear pile as the fission fragment source. The author examined the possibility of replacing the critical pile with a sub-critical pi… more
Date: March 1, 1992
Creator: Hdinger, D.S.
Partner: UNT Libraries Government Documents Department
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