Gamma--gamma directional correlation studies in $sup 77$Ge decay (open access)

Gamma--gamma directional correlation studies in $sup 77$Ge decay

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Date: November 20, 1974
Creator: Lent, E.M.
System: The UNT Digital Library
Legacies of Power: The Cultural Heritage of Theological White Supremacy, A Case Study of Ku Klux Konfederatism in Denton County Texas, 1850-1930 (open access)

Legacies of Power: The Cultural Heritage of Theological White Supremacy, A Case Study of Ku Klux Konfederatism in Denton County Texas, 1850-1930

Undergraduate thesis exploring modern American racism as the result of the nation's legacy of theological white supremacy and its deep-rooted racial issues that remain unresolved because of the theo-mythologies embedded at the core of the nation's foundational fabric that have been and continue to be largely unaccounted for in corrective racial discourse through a case study of Denton, Texas. By employing localized interdisciplinary methodological approaches aimed at unveiling the theo-myth which underscores the modern American racial ontology, this study examines how theological white supremacy was homogenized into popular culture in Denton County Texas following the Civil War via neo-Confederate Ku Klux Klan movement, which the author calls Ku Klux Konfederatism, that continues its influence today through localized theo-political institutions, sociocultural systems and cultural 'norms.'
Date: April 20, 2020
Creator: Luther Rummel, Jessica Rae
System: The UNT Digital Library
BioAerosol Mass Spectrometry: Reagentless Detection of Individual Airborne Spores and Other Bioagent Particles Based on Laser Desorption/Ionization Mass Spectrometry (open access)

BioAerosol Mass Spectrometry: Reagentless Detection of Individual Airborne Spores and Other Bioagent Particles Based on Laser Desorption/Ionization Mass Spectrometry

Better devices are needed for the detection of aerosolized biological warfare agents. Advances in the ongoing development of one such device, the BioAerosol Mass Spectrometry (BAMS) system, are described here in detail. The system samples individual, micrometer-sized particles directly from the air and analyzes them in real-time without sample preparation or use of reagents. At the core of the BAMS system is a dual-polarity, single-particle mass spectrometer with a laser based desorption and ionization (DI) system. The mass spectra produced by early proof-of-concept instruments were highly variable and contained limited information to differentiate certain types of similar biological particles. The investigation of this variability and subsequent changes to the DI laser system are described. The modifications have reduced the observed variability and thereby increased the usable information content in the spectra. These improvements would have little value without software to analyze and identify the mass spectra. Important improvements have been made to the algorithms that initially processed and analyzed the data. Single particles can be identified with an impressive level of accuracy, but to obtain significant reductions in the overall false alarm rate of the BAMS instrument, alarm decisions must be made dynamically on the basis of multiple analyzed particles. …
Date: July 20, 2004
Creator: Steele, P T
System: The UNT Digital Library
Monitoring microbe-induced physical property changes using high-frequency acoustic waveform data: Toward the development of a microbial megascope (open access)

Monitoring microbe-induced physical property changes using high-frequency acoustic waveform data: Toward the development of a microbial megascope

A laboratory investigation was undertaken to determine the effect of microbe generated gas bubbles in controlled, saturated sediment columns utilizing a novel technique involving acoustic wave propagation. Specifically, the effect of denitrifying bacteria on saturated flow conditions was evaluated in light of the stimulated production of N{sub 2} gas and the resulting plugging of the pore throats. The propagation of high frequency acoustic waves through the sediment columns was used to locate those regions in the column where gas accumulation occurred. Over a period of six weeks, regions of gas accumulation resulted in the attenuation of acoustic wave energies with the decreases in amplitude typically greater than one order of magnitude.
Date: May 20, 2002
Creator: Williams, Kenneth Hurst
System: The UNT Digital Library