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WITS - WASTE DATA COLLECTION WITH OUR PALMS AT OUR FINGERTIPS
The waste management and environmental compliance group (NMT-7) at the Los Alamos National Laboratory (LANL) has initiated a project to build a computer-based system for tracking inventory, storage and disposal information for hazardous and radioactive waste and contaminated byproducts. This project, the Waste Inventory Tracking System (WITS), will initially be used in TA-55 (which includes the Los Alamos National Laboratory Plutonium Facility) and the Chemical and Metallurgy Research (CMR) building where wastes are generated. The system handles numerous waste types with variation in size, disposal method, and hazard classification including: low level waste such as room trash (compactable waste), SEG waste (non-compactable), and over-sized waste, mixed waste, hazardous and chemical waste, universal waste, and waste containing asbestos and PCB's. WITS is designed to provide up-to-date location, status, content information, radioactivity analyses, and other inventory information for every waste item and container managed by NMT-7. The system will support comprehensive reporting capabilities and cradle-to-grave audit trails. WITS is intended to facilitate handling of waste by NMT-7 staff to help minimize waste disposal costs, ensure compliance with applicable regulations, and standardize waste management methodologies and practices. This paper compares current management practices with revised methodologies supported by WITS. It shows how automating …
Date:
November 1, 2000
Creator:
Martinez, B.
Object Type:
Report
System:
The UNT Digital Library
Working Group 2 summary: Space charge effects in bending systems
At the start of the Workshop, the authors asked the Working Group 2 participants to concentrate on three basic goals: (1) survey the status of how comprehensively the physics concerning space-charge effects in bends is understood and how complete is the available ensemble of analytic and computational tools; (2) guided by data from experiments and operational experience, identify sources of, and cures for, beam degradation; and (3) review space-charge physics in rings and the limitations it introduces. As the Workshop unfolded, the third goal naturally folded into the other two goals, and these goals, they believe, were fulfilled in that the Working Group was able to compile an end product consisting of a set of recommendations for potentially fruitful future work. This summary constitutes an overview of the deliberations of the Working Group, and it is their hope that the summary clarifies the motivation for the recommended work listed at the end. The summary is organized according to the two aforementioned goals, and the prime topics of discussion appear as subsections under these goals.
Date:
February 1, 2000
Creator:
Bohn, C.L. & Emma, P.J.
Object Type:
Article
System:
The UNT Digital Library
[Workshop on Current Problems in Particle Theory]. Final Report on Agreement No. D36 2042
A description is given of the 23rd Johns Hopkins Workshop on Current Problems in Particle Theory, held at The Johns Hopkins University in June 1999.
Date:
January 1, 2000
Creator:
Domokos, G. & Kovesi-Domokos, S.
Object Type:
Report
System:
The UNT Digital Library
Workshop on the origin of the heavy elements: Astrophysical models and experimental challenges, Santa Fe, New Mexico, September 3-4, 1999
This Workshop was held on September 3--4, 1999, following the 10th International Symposium on Capture Gamma-Ray Spectroscopy. Presentations were made by 14 speakers, 6 from the US and 8 from other countries on topics relevant to s-, r- and rp-process nucleosynthesis. Laboratory experiments, both present and planned, and astrophysical observations were represented as were astrophysical models. Approximately 50 scientists participated in this Workshop. These Proceedings consist of copies of vu-graphs presented at the Workshop. For further information, the interested readers are referred to the authors.
Date:
January 1, 2000
Creator:
Haight, Robert C.; Ullmann, John L.; Strottman, Daniel D.; Koehler, Paul E. & Kaeppeler, Franz
Object Type:
Article
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 53, No. 40, Ed. 1 Wednesday, March 1, 2000
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
March 1, 2000
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History
The Wynnewood Gazette (Wynnewood, Okla.), Vol. 98, No. 9, Ed. 1 Thursday, June 1, 2000
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 1, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
X-ray and Gamma-ray Spectroscopy of Solids under Pressure
This report describes our recent synchrotrons x-ray absorption fine structure (XAFS) measurements on a number of systems that undergo pressure induced changes in local structure at high pressure. The reader should also refer to the accompanying renewal proposal for a more in-depth discussion of the general scope of this program, and its relevance to condensed matter science. We merely state that the methods here are aimed at using XAFS to probe the various phenomena that are caused by high pressure, especially including various structural, and/or electronic, changes or transitions. Our general technique is based upon a pressure cell which utilizes scintered boron carbide anvils, since diamond anvils generally produce Bragg glitches which spoil the high quality XAFS necessary for precision structural measurements. Sample pressure is determined at the beam-line by measuring and analyzing, via XAFS, the compression of some cubic material contained within the sample chamber. Recently we have extended this work to 77 K using helium gas for the applied force, rather than hydraulic oil. This report period has been productive. The increased flux available at the Stanford Synchrotrons Radiation Laboratory (SSRL) has permitted our going to smaller beams, on the order of 300 pm in diameter, for precision …
Date:
March 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
X-ray and photoelectron spectroscopy of the structure, reactivity, and electronic structure of semiconductor nanocrystals
Semiconductor nanocrystals are a system which has been the focus of interest due to their size dependent properties and their possible use in technological applications. Many chemical and physical properties vary systematically with the size of the nanocrystal and thus their study enables the investigation of scaling laws. Due to the increasing surface to volume ratio as size is decreased, the surfaces of nanocrystals are expected to have a large influence on their electronic, thermodynamic, and chemical behavior. In spite of their importance, nanocrystal surfaces are still relatively uncharacterized in terms of their structure, electronic properties, bonding, and reactivity. Investigation of nanocrystal surfaces is currently limited by what techniques to use, and which methods are suitable for nanocrystals is still being determined. This work presents experiments using x-ray and electronic spectroscopies to explore the structure, reactivity, and electronic properties of semiconductor (CdSe, InAs) nanocrystals and how they vary with size. Specifically, x-ray absorption near edge spectroscopy (XANES) in conjunction with multiple scattering simulations affords information about the structural disorder present at the surface of the nanocrystal. X-ray photoelectron spectroscopy (XPS) and ultra-violet photoelectron spectroscopy (UPS) probe the electronic structure in terms of hole screening, and also give information about band …
Date:
May 1, 2000
Creator:
Hamad, K.S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
X-ray magneto-optic KERR effect studies of spring magnet heterostructures.
The complex 3-dimensional magnetization reversal behavior of Sin-Co/Fe exchange spring films is used to test the sensitivity of different resonant soft x-ray magneto-optical Kerr effect (MOKE) measurements to changes in longitudinal and transverse moments within the SOIIFe layer and to changes in these moments in depth within the Fe layer. As in the visible MOKE, changes in longitudinal and net transverse moments are resolved by measuring both Kerr rotation and intensity loops in the near the Fe 2p core resonance. These x-ray MOKE signals measured using linear incident polarization are more directly interpreted in terms of longitudinal and transverse moments than are the same signals measured using elliptical polarization. Varying photon energy near the Fe L3line is shown to be an effective means of resolving distinctly different reversal behavior at the top and bottom of the 20 nm thick Fe layer resulting from the strong exchange coupling at the Sin-Co/Fe interface. Measured x-ray MOKE spectra and signals are in qualitative agreement with those calculated using standard magneto-optical formalisms incorporating interference between different layers and measured helicity-dependent magneto-optical constants for Fe.
Date:
November 1, 2000
Creator:
Kortright, J. B.; Kim, S. K.; Fullerton, E. E.; Jiang, J. S. & Bader, S. D.
Object Type:
Article
System:
The UNT Digital Library
X-RAY YIELD SCALING STUDIES PERFORMED ON THE OMEGA LASER
None
Date:
June 1, 2000
Creator:
WORKMAN, J. B. & KYRALA, G. A.
Object Type:
Article
System:
The UNT Digital Library
XAFS Study of Ba(II) Adsorption on Na-Montmorillonite Surfaces
None
Date:
November 1, 2000
Creator:
Zhou, Weiqing; Zhang, Pengchu; Sayers, Dale E.; Hesterberg, Dean; Brady, Patrick V. & Arthur, Sara E.
Object Type:
Article
System:
The UNT Digital Library
XANES, EXAFS and Kbeta spectroscopic studies of the oxygen-evolving complex in Photosystem II
A key question for the understanding of photosynthetic water oxidation is whether the four oxidizing equivalents necessary to oxidize water to dioxygen are accumulated on the four Mn ions of the oxygen evolving complex (OEC), or whether some ligand-centered oxidations take place before the formation and release of dioxygen during the S{sub 3} {r_arrow} [S{sub 4}] {r_arrow} S{sub 0} transition. Progress in instrumentation and flash sample preparation allowed us to apply Mn K{beta} X-ray emission spectroscopy (Kb XES) to this problem for the first time. The K{beta} XES results, in combination with Mn X-ray absorption near-edge structure (XANES) and electron paramagnetic resonance (EPR) data obtained from the same set of samples, show that the S{sub 2} {r_arrow} S{sub 3} transition, in contrast to the S{sub 0} {r_arrow} S{sub 1} and S{sub 1} {r_arrow} S{sub 2} transitions, does not involve a Mn-centered oxidation. This is rationalized by manganese {mu}-oxo bridge radical formation during the S{sub 2} {r_arrow} S{sub 3} transition. Using extended X-ray absorption fine structure (EXAFS) spectroscopy, the local environment of the Mn atoms in the S{sub 0} state has been structurally characterized. These results show that the Mn-Mn distance in one of the di-{mu}-oxo-bridged Mn-Mn moieties increases from 2.7 …
Date:
December 1, 2000
Creator:
Robblee, John H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Y-12 Plant Groundwater Protection Program Groundwater and Surface Water Sampling and Analysis Plan for Calendar Year 2001
None
Date:
September 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Y-12 Respirator Flow Cycle Time Reduction Project
In mid-July 2000, a Cycle Time Reduction (CTR) project was initiated by senior management to improve the flow and overall efficiency of the respirator distribution process at Y-12. A cross-functional team was formed to evaluate the current process and to propose necessary changes for improvement. Specifically, the team was challenged to make improvements that would eliminate production work stoppages due to the unavailability of respirators in Y-12 Stores. Prior to the team initiation, plant back orders for a specific model respirator were averaging above 600 and have been as high as 750+. The Cycle Time Reduction team segmented the respirator flow into detailed steps, with the focus and emphasis primarily being on the movement of dirty respirators out of work areas, transportation to Oak Ridge National Laboratory (ORNL) Laundry, and return back to Y-12 Stores inventory. The team selected a popular model respirator, size large, to track improvements. Despite a 30 percent increase in respirator usage for the same period of time in the previous year, the team has reduced the back orders by 89% with a steady trend downward. Summary of accomplishments: A 47 percent reduction in the average cycle time for dirty respirators to be laundered and stocked …
Date:
December 1, 2000
Creator:
Hawk, C. T. & Rogers, P. E.
Object Type:
Report
System:
The UNT Digital Library
Yellow Starthistle and Salmon Recovery, Final Report 2000.
None
Date:
December 1, 2000
Creator:
Johnson, B.
Object Type:
Report
System:
The UNT Digital Library
Z-Pinch Fusion for Energy Applications
Z pinches, the oldest fusion concept, have recently been revisited in light of significant advances in the fields of plasma physics and pulsed power engineering. The possibility exists for z-pinch fusion to play a role in commercial energy applications. We report on work to develop z-pinch fusion concepts, the result of an extensive literature search, and the output for a congressionally-mandated workshop on fusion energy held in Snowmass, Co July 11-23,1999.
Date:
January 1, 2000
Creator:
Spielman, Rick B.
Object Type:
Report
System:
The UNT Digital Library
ZB/WZ Band Offsets and Carrier Localization in CdTe Solar Cells
Using the first principles band-structure method, we studied systematically the stability and electronic structure of CdX (X=S, Se, and Te) semiconductors with the zinc-blende (ZB) and wurtzite (WZ) crystal structures.
Date:
January 1, 2000
Creator:
Wei, S.-H. & Zhang, S. B.
Object Type:
Article
System:
The UNT Digital Library
Zero emission coal
We discuss a novel, emission-free process for producing hydrogen or electricity from coal. Even though we focus on coal, the basic design is compatible with any carbonaceous fuel. The process uses cyclical carbonation of calcium oxide to promote the production of hydrogen from carbon and water. The carbonation of the calcium oxide removes carbon dioxide from the reaction products and provides the additional energy necessary to complete hydrogen production without additional combustion of carbon. The calcination of the resulting calcium carbonate is accomplished using the high temperature waste heat from solid oxide fuel cells (SOFC), which generate electricity from hydrogen fuel. Converting waste heat back to useful chemical energy allows the process to achieve very high conversion efficiency from fuel energy to electrical energy. As the process is essentially closed-loop, the process is able to achieve zero emissions if the concentrated exhaust stream of CO{sub 2} is sequestered. Carbon dioxide disposal is accomplished by the production of magnesium carbonate from ultramafic rock. The end products of the sequestration process are stable naturally occurring minerals. Sufficient rich ultramafic deposits exist to easily handle all the world's coal.
Date:
August 1, 2000
Creator:
Ziock, H. & Lackner, K.
Object Type:
Article
System:
The UNT Digital Library
Zirconia-Based Mixed Potential CO/HC Sensors with LaMnO3 and Th-doped YSZ Electrodes
Abstract: We have investigated the performance of dual metal oxide electrode mixed potential sensors in an engine-out, dynamometer environment. Sensors were fabricated by sputtering thin films of LaMnO{sub 3} and Tb-doped YSZ onto YSZ electrolyte. Au gauze held onto the metal oxide thin films with Au ink was used for current collection. The exhaust gas from a 4.8L, V8 engine operated in open loop, steady-state mode around stoichiometry at 1500 RPM and 50 Nm. The sensor showed a stable EMF response (with no hysteresis) to varying concentrations of total exhaust gas HC content. The sensor response was measured at 620 and 670 C and shows temperature behavior characteristic of mixed potential-type sensors. The results of these engine-dynamometer tests are encouraging; however, the limitations associated with Au current collection present the biggest impediment to automotive use.
Date:
October 1, 2000
Creator:
Brosha, Eric L.; Mukundan, Rangachary; Brown, David R.; Garzon, Fernando H.; Visser, J. H.; Thompson, David J. et al.
Object Type:
Article
System:
The UNT Digital Library
Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains.
Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1], and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-5] and that X-grains have an unusual Mo isotopic composition that differs from s- and r-process expectations [6,7]. We report here the first measurements of Zr and Mo isotopes in several grains of other rare types that were found in the same mount as the mainstream and X-grains reported previously.
Date:
March 1, 2000
Creator:
Pellin, M. J.; Davis, A. M.; Calaway, W. F.; Lewis, R. S.; Clayton, R. N. & Amari, S.
Object Type:
Article
System:
The UNT Digital Library