7 Matching Results

Search Results

Results: 1 - 7
open access

Mass-spectrometric determination of trace elements in aqueous media without preconcentration

Description: Feasibility of using a low pressure glow discharge as an ion source for the mass spectrometric determination of trace elements in aqueous media was investigated. A cryogenically cooled hollow cathode ion source was developed to analyze aqueous samples without external preconcentration. Aqueous solutions containing seventy elements were analyzed and the detection limits, sensitivity factors, and linear regression correlation coefficients were determined. A standard test solution of trace element… more
Date: October 1, 1981
Creator: Foss, G. O.
Partner: UNT Libraries Government Documents Department
open access

Pre-Raphaelites: The First Decadents

Description: The ephemeral life of the Pre-Raphaelite Brotherhood belies the importance of an organization that grows from and transcends its originally limited aesthetic principles and circumscribed credo. The founding of the Pre-Raphaelite Brotherhood in 1848 really marks the beginning of a movement that metamorphizes into Aestheticism/Decadence. It is the purpose of this dissertation to demonstrate that, from its inception, Pre-Raphaelitism is the first English manifestation of Aestheticism/Decadence. Al… more
Date: October 1980
Creator: Benson, Paul F.
Partner: UNT Libraries
open access

Minimizing the Cost of Splitting in Monte Carlo Radiation Transport Simulation

Description: A deterministic analysis of the computational cost associated with geometric splitting/Russian roulette in Monte Carlo radiation transport calculations is presented. Appropriate integro-differential equations are developed for the first and second moments of the Monte Carlo tally as well as time per particle history, given that splitting with Russian roulette takes place at one (or several) internal surfaces of the geometry. The equations are solved using a standard S/sub n/ (discrete ordinates… more
Date: October 1, 1980
Creator: Juzaitis, R. J.
Partner: UNT Libraries Government Documents Department
open access

Mini-ADA Compiler Project

Description: The Ada language is one of the most controversial topics in computer science today. Ada was originally designed as a solution to the software maintenance problems encountered by the United States Department of Defense[2], and as a multi-purpose language to be used particularly in an embedded computer system[7]. Never before has a project been undertaken. The Ada language does not simply entail the construction of a new compiler or a new language definition, it is this and a great deal more.
Date: October 1983
Creator: Chang, Kai
Partner: UNT Libraries
open access

Hydrogen and Deuterium NMR of Solids by Magic Angle Spinning

Description: The nuclear magnetic resonance of solids has long been characterized by very large spectral broadening which arises from internuclear dipole-dipole coupling or the nuclear electric quadrupole interaction. These couplings can obscure the smaller chemical shift interaction and make that information unavailable. Two important and difficult cases are that of hydrogen and deuterium. For example, the homonuclear dipolar broadening, HD, for hydrogen is usually several tens of kilohertz. For deuterium,… more
Date: October 1, 1982
Creator: Eckman, R. R.
Partner: UNT Libraries Government Documents Department
open access

Broadband Excitation in Nuclear Magnetic Resonance

Description: Theoretical methods for designing sequences of radio frequency (rf) radiation pulses for broadband excitation of spin systems in nuclear magnetic resonance (NMR) are described. The sequences excite spins uniformly over large ranges of resonant frequencies arising from static magnetic field inhomogeneity, chemical shift differences, or spin couplings, or over large ranges of rf field amplitudes. Specific sequences for creating a population inversion or transverse magnetization are derived and de… more
Date: October 1, 1984
Creator: Tycko, R.
Partner: UNT Libraries Government Documents Department
open access

Wave

Description: From this investigation, I hoped to answer the following questions. 1) Was there a relationship between the apparent disorder evident at a boundary area and the wave form? 2. Was the wave configuration an archetypal motif? 3. If there was an archetypal wave form, did its presence transcend the use of a scientific medium?
Date: October 1989
Creator: Fernandes, Leslie
Partner: UNT Libraries
Back to Top of Screen