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Laser: a Tool for Optimization and Enhancement of Analytical Methods

Description: In this work, we use lasers to enhance possibilities of laser desorption methods and to optimize coating procedure for capillary electrophoresis (CE). We use several different instrumental arrangements to characterize matrix-assisted laser desorption (MALD) at atmospheric pressure and in vacuum. In imaging mode, 488-nm argon-ion laser beam is deflected by two acousto-optic deflectors to scan plumes desorbed at atmospheric pressure via absorption. All absorbing species, including neutral molecul… more
Date: January 1, 1997
Creator: Preisler, Jan
Partner: UNT Libraries Government Documents Department
open access

The interaction of katabatic winds and mountain waves

Description: The variation in the oft-observed, thermally-forced, nocturnal katabatic winds along the east side of the Rocky Mountains can be explained by either internal variability or interactions with various other forcings. Though generally katabatic flows have been studied as an entity protected from external forcing by strong thermal stratification, this work investigates how drainage winds along the Colorado Front Range interact with, in particular, topographically forced mountain waves. Previous wor… more
Date: January 1, 1997
Creator: Poulos, G.S.
Partner: UNT Libraries Government Documents Department
open access

Construction of artificial pigment-protein antennae

Description: Photosynthesis is a complex process which results in the conversion of solar radiation into chemical energy. This chemical energy is then used as the free energy source for all living organisms. In its basic form, photosynthesis can be described as the light-activated synthesis of carbohydrates from the simple molecules of water and carbon dioxide: 6H{sub 2}O + 6 CO{sub 2} light C{sub 6}H{sub 12}O{sub 6} + 6 O{sub 2} This basic mechanism actually requires numerous reaction steps. The two primar… more
Date: January 10, 1997
Creator: Sibbald, J.
Partner: UNT Libraries Government Documents Department
open access

Unique applications of solvent removal in inductively coupled plasma mass spectrometry

Description: Inductively coupled plasma mass spectrometry (ICP-MS) is the technique of choice for rapid, high precision, semiquantitative elemental and isotopic analysis for over 70 elements. Less than 20 years after the first mass spectrum was obtained by ICP-MS, this technique has applications in clinical chemistry, geochemistry, the semiconductor industry, the nuclear industry, environmental chemistry, and forensic chemistry. The determination of many elements, though, by ICP-MS is complicated by spectra… more
Date: January 10, 1997
Creator: Minnich, M.
Partner: UNT Libraries Government Documents Department
open access

Scanning probe microscopies for the creation and characterization of interfacial architectures: Studies of alkyl thiolate monolayers at gold

Description: Scanning probe microscopy (SPM) offers access to the structural and material properties of interfaces, and when combined with macroscopic characterization techniques results in a powerful interfacial development tool. However, the relative infancy of SPM techniques has dictated that initial investigations concentrate on model interfacial systems as benchmarks for testing the control and characterization capabilities of SPM. One such family of model interfacial systems results from the spontaneo… more
Date: January 10, 1997
Creator: Green, J.
Partner: UNT Libraries Government Documents Department
open access

Effect of microscale protrusions on local fluid flow and mass transport in the presence of forced convection

Description: Three-dimensional creeping flow around single, axisymmetric protrusions is studied numerically using the boundary-integral technique. Emphasis is placed upon cylindrical protrusions on plane walls for various height-to-radius (h-to-a) aspect ratios, but cones and sections of spheres protruding from plane walls are also briefly examined. The presented items include shear-stress distributions, shear-stress contours, extents of the fluid-flow disturbance, total forces and torques on the cylinders,… more
Date: January 1, 1997
Creator: Matzen, G.W.
Partner: UNT Libraries Government Documents Department
open access

A theoretical study of the electronic structure of Invar Fe*3Pt and related materials

Description: The Full Potential Linear Augmented Plane Wave (FPLAPW or FLAPW) method is used for a spin-polarized band calculation for ordered Fe{sub 3}Pt. As major purpose, the momentum distributions of the spin-polarized electrons are calculated and compared with results from a magnetic Compton scattering measurement. To get related information, the electronic behavior is also analyzed by examining the partial densities of states and the spatial electron distributions; the role of alloying effects is then… more
Date: January 10, 1997
Creator: Zuo, Zhiqi
Partner: UNT Libraries Government Documents Department
open access

Physical metallurgy and properties of TiNiSn and PtMnSb

Description: The single crystals of TiNiSn and polycrystalline PtMnSb were grown by the flux and melt cooling method. Their lattice parameters and structures were determined by x-ray diffraction. The effect of impurities on the growth of TiNiSn single crystals was investigated. It was found that the concentration of chlorine plays a key role in determining the chemical composition of the phases that are formed. The heat capacity and magnetic susceptibility of TiNiSn was measured in a temperature range from … more
Date: January 10, 1997
Creator: Zhong, B.
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 D0 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 {r_arrow} e{nu}) and Br(Z {r_arrow} ee)) in p{anti p} collisions at {radical}s = 1.8 TeV. The analysis is based on 12.8 pb{sup {minus}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 {r_arrow} e{nu}) = 2.36 {+-… more
Date: January 1, 1997
Creator: Grudberg, P.M.
Partner: UNT Libraries Government Documents Department
open access

Compliance program for 40 CFR 61, Subpart H at Los Alamos National Laboratory

Description: Effective on March 15, 1990, the Environmental Protection Agency established regulations controlling the emission of radionuclides to the air from Department of Energy facilities to limit the dose to the public to 10 mrem/yr. These regulations are detailed in 40 CFR 61, Subpart H, {open_quotes}National Emission Standards for Emissions of Radionuclides Other Than Radon from Department of Energy Facilities{close_quotes}. Part of these regulations require the operation of sampling systems on stack… more
Date: January 1, 1997
Creator: McNamara, E.A.
Partner: UNT Libraries Government Documents Department
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