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Diffusion Resistant, High-Purity Wafer Carriers For SI Semiconductor Production
The Cooperative Research and Development Agreement (CRADA) was directed towards development of diffusion resistant, high-purity wafer carriers for Si semiconductor production with improved properties compared to current materials. The determination of the infiltration behavior is important for controlling the fabrication process to. obtain consistent high-quality products. Ammonium molybdate or molybdenum carbide were found to be suitable as a precursor to produce SiC-MoSi{sub 2}-Si composites by Si infiltration into carbon preforms. Experiments on the pyrolysis of the preforms showed variable infiltration behavior by the molten Si (within the range of conditions in the present study). Further research is required to reproducibly and consistently fabricate flaw-free articles. The strength of the composites fabricated to-date was 325{+-}124 MPa, which is higher than current commercial products. Better process control should result in higher average strengths and reduce the variability.
Date:
October 1, 2000
Creator:
Tiegs, T. N. & Leaskey, L.
Object Type:
Report
System:
The UNT Digital Library
DISPOSAL OF FLUIDIZED BED COMBUSTION ASH IN AN UNDERGROUND MINE TO CONTROL ACID MINE DRAINAGE AND SUBSIDENCE
This project evaluated the technical, economic and environmental feasibility of filling abandoned underground mine voids with coal combustion byproducts. Success was measured in terms of technical feasibility of the approach (i.e. % void filling), cost, environmental benefits (acid mine drainage and subsidence control) and environmental impacts (noxious ion release). Phase 1 of the project was completed in September 1995 and was concerned with the development of the grout and a series of predictive models. These models were verified through the Phase II field phase and will be further verified fin the large scale field demonstration of Phase III. The verification allows the results to be packaged in such a way that the technology can be easily adapted to different site conditions. Phase II was successfully completed with 1000 cubic yards of grout being injected into Anker Energy's Fairfax mine. The grout flowed over 600 feet from a single injection borehole. The grout achieved a compressive strength of over 1000 psi (twice the level that is needed to guarantee subsidence control). Phase III was a full scale test at Anker's eleven acre Longridge mine site. The CCB grout replaced what was an open mine void with a solid so that the …
Date:
October 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
DVCS amplitude at tree level: Transversality, twist-3, and factorization
We study the virtual Compton amplitude in the generalized Bjorken region (q{sup 2} -> Infinity, t small) in QCD by means of a light-cone expansion of the product of e.m. currents in string operators in coordinate space. Electromagnetic gauge invariance (transversality) is maintained by including in addition to the twist-2 operators 'kinematical' twist-3 operators, which appear as total derivatives of twist-2 operators. The non-forward matrix elements of the elementary twist-2 operators are parametrized in terms of two-variable spectral functions (double distributions), from which twist-2 and 3 skewed distributions are obtained through reduction formulas. Our approach is equivalent to a Wandzura-Wilczek type approximation for the twist-3 skewed distributions. The resulting Compton amplitude is manifestly transverse up to terms of order t/q{sup 2}. We find that in this approximation the tensor amplitude for longitudinal polarization of the virtual photon is finite, while the one for transverse pol arization contains a divergence already at tree level. However, this divergence has zero projection on the polarization vector of the final photon, so that the physical helicity amplitudes are finite.
Date:
October 1, 2000
Creator:
Radyushkin, A.V. & Weiss, C.
Object Type:
Article
System:
The UNT Digital Library
Dynamic Effects of Tank Waste Aging on Radionuclide-Complexant Interactions - Final Report - 10/01/1997 - 10/01/2000
The long-range objective of this project is to provide a scientific basis for safely processing high-level nuclear tanks wastes for disposal. Our goals are to identify a means to prepare realistic simulant formulations for complexant-containing Hanford tank wastes, and then use those simulants to determine the relative importance of various organic complexants and their breakdown products on the partitioning of important radionuclides. The harsh chemical and radiolytic environment in high-level waste tanks alters both the organic complexants and the metal species, producing radionuclide-chelator complexes that resist standard separation methods. A detailed understanding of the complexation reactions of the key radionuclides in tank wastes would allow for reliable, science-based solutions for high-level waste processing, but a key problem is that tank waste samples are exceedingly difficult to obtain, transport and handle in the laboratory. In contrast, freshly-prepared simulated wastes are safe and readily obtained, but they do not reproduce the partitioning behavior of actual tank waste samples. For this project, we will first artificially age complexant-containing tank waste simulants using microwave, ultrasound, and photolysis techniques that can be applied in any standard laboratory. The aged samples will be compared to samples of actual Hanford tank wastes to determine the most realistic …
Date:
October 1, 2000
Creator:
Chamberlin, Rebecca M.; Arterburn, Jeffrey B. & Arterburn, Jeffrey B.
Object Type:
Report
System:
The UNT Digital Library
[Edmund and Emily Miller House Photograph #1]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #2]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #3]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #4]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #5]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #6]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #7]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #8]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Edmund and Emily Miller House Photograph #9]
Photograph of the Edmund and Emily Miller House, in Austin, Texas.
Date:
October 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
THE EFFECT OF ALLOYING ON THE PROPERTIES OF (Nb,Ti) CR2 C15 LAVES PHASES
None
Date:
October 1, 2000
Creator:
THOMA, D.; NIBUR, K. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
EFFECTS OF FLY ASH ON MERCURY OXIDATION DURING POST COMBUSTION CONDITIONS
Tests were performed in simulated flue gas streams using two fly ash samples from the electrostatic precipitators of two full-scale utility boilers. One fly ash was derived from a Powder River Basin (PRB) coal, while the other was derived from Blacksville coal (Pittsburgh No. 8 seam). The tests were performed at temperatures of 120 and 180 C under different gas compositions using whole fly ash samples as well as magnetic and nonmagnetic concentrates from sized fly ash. Only the Blacksville ash contained magnetic phases. The whole and fractionated fly ash samples were analyzed for morphology, chemical composition, mineralogical composition, total organic carbon, porosity, and surface area. Mineralogically, the Blacksville ash was composed predominantly of magnetite, hematite, quartz, and mullite, while the PRB ash contained mostly quartz with lesser amounts of lime, periclase, and calcium aluminum oxide. The iron oxides in the Blacksville ash were concentrated almost entirely in the largest size fraction. As anticipated, there was not a clean separation of magnetic (Fe-rich) and nonmagnetic (aluminosilicate-rich) phases for the Blacksville ash. The Blacksville ash had a significantly higher surface area and a much higher unburned carbon content than the PRB ash. Elemental mercury (Hg) streams were injected into the simulated …
Date:
October 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Effects of Water Radiolysis in Water Cooled Reactors - Nuclear Energy Research Initiative (NERI) Program
OAK B188 Quarterly Progress Report on NERI Proposal No.99-0010 for the Development of an Experiment and Calculation Based Model to Describe the Effects of Radiation on Non-standard Aqueous Systems Like Those Encountered in the Advanced Light Water Reactor
Date:
October 1, 2000
Creator:
Pimblott, S. M.
Object Type:
Report
System:
The UNT Digital Library
The Efficacy of Oxidative Coupling for Promoting In-Situ Immobilization of Hydroxylated Aromatics in Contaminated Soil and Sediments Systems - Final Report
The study clearly shows that the structure and composition of the organic matter of soils and sediments are essential considerations for the selection of materials for engineered applications of oxidative coupling processes. A rate model was developed to facilitate quantitative evaluation and mechanistic interpretation of these fairly complex coupling processes.
Date:
October 1, 2000
Creator:
Weber Jr., W. J.
Object Type:
Report
System:
The UNT Digital Library
ELECTRICAL IMAGING AT THE LARGE BLOCK TEST YUCCA MOUNTAIN, NEVADA
A monolithic block of densely welded tuff was excavated from a site on Fran Ridge near Yucca Mountain, Nevada so that coupled thermohydrological processes could be studied in a controlled, in situ experiment. A series of heaters were placed in a horizontal plane about 3 m from the top of the 3 m by 3 m by 4.5 m high block. Temperatures were measured at many points within and on the block surface and a suite of other measurements were taken to define the thermal and hydrologic response. Electrical resistance tomography (ERT) was used to map 2 dimensional images of moisture content changes along four planes in the block. The ERT images clearly delineate the drying and wetting of the rockmass during the 13 months of heating and subsequent six months of cool down. The main feature is a prominent dry zone that forms around the heaters then gradually disappears as the rock cools down. Other features include linear anomalies of decreasing moisture content which are fractures dehydrating as the block heats up. There are also examples of compact anomalies of wetting. Some of these appear to be water accumulation in fractures which are draining condensate from the block. Others …
Date:
October 1, 2000
Creator:
Ramirez, A.
Object Type:
Report
System:
The UNT Digital Library
ELECTROCHEMICALLY-GROWN OXIDES ON U-NB ALLOY
None
Date:
October 1, 2000
Creator:
LILLARD, J. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Electromagnetic Structure of Few-Nucleon Systems: a Critical Review
Our current understanding of the structure of nuclei with up to A=8, including energy spectra, electromagnetic form factors, and capture reactions, is critically reviewed within the context of a realistic approach to nuclear dynamics based on two- and three-nucleon interactions and associated electromagnetic currents.
Date:
October 1, 2000
Creator:
Schiavilla, R.
Object Type:
Article
System:
The UNT Digital Library
ELEMENTARY APPROACH TO SELF-ASSEMBLY AND ELASTIC PROPERTIES OF RANDOM COPOLYMERS
The authors have mapped the physics of a system of random copolymers onto a time-dependent density functional-type field theory using techniques of functional integration. Time in the theory is merely a label for the location of a given monomer along the extent of a flexible chain. We derive heuristically within this approach a non-local constraint which prevents segments on chains in the system from straying too far from each other, and leads to self-assembly. The structure factor is then computed in a straightforward fashion. The long wave-length limit of the structure factor is used to obtain the elastic modulus of the network. It is shown that there is a surprising competition between the degree of micro-phase separation and the elastic moduli of the system.
Date:
October 1, 2000
Creator:
CHITANVIS, S. M.
Object Type:
Article
System:
The UNT Digital Library
Emerging energy-efficient industrial technologies
U.S. industry consumes approximately 37 percent of the nation's energy to produce 24 percent of the nation's GDP. Increasingly, industry is confronted with the challenge of moving toward a cleaner, more sustainable path of production and consumption, while increasing global competitiveness. Technology will be essential for meeting these challenges. At some point, businesses are faced with investment in new capital stock. At this decision point, new and emerging technologies compete for capital investment alongside more established or mature technologies. Understanding the dynamics of the decision-making process is important to perceive what drives technology change and the overall effect on industrial energy use. The assessment of emerging energy-efficient industrial technologies can be useful for: (1) identifying R&D projects; (2) identifying potential technologies for market transformation activities; (3) providing common information on technologies to a broad audience of policy-makers; and (4) offering new insights into technology development and energy efficiency potentials. With the support of PG&E Co., NYSERDA, DOE, EPA, NEEA, and the Iowa Energy Center, staff from LBNL and ACEEE produced this assessment of emerging energy-efficient industrial technologies. The goal was to collect information on a broad array of potentially significant emerging energy-efficient industrial technologies and carefully characterize a sub-group of …
Date:
October 1, 2000
Creator:
Martin, N.; Worrell, E.; Ruth, M.; Price, L.; Elliott, R. N.; Shipley, A. M. et al.
Object Type:
Report
System:
The UNT Digital Library
ENABLING R and D FOR FUTURE PROTON APPLICATIONS
None
Date:
October 1, 2000
Creator:
THIESSEN, H. A.; BARLOW, D. & AL, ET
Object Type:
Report
System:
The UNT Digital Library
Environmental Management Performance Report October 2000
This section provides an executive level summary of the performance information covered in this report and is intended to bring to Management's attention that information considered to be most noteworthy. All cost, schedule, milestone commitments, performance measures. and safety data is current as of August 31. Accomplishments, Issues and Integration items are current as of September 18 unless otherwise noted. The section begins with a description of notable accomplishments that have occurred since the last report and are considered to have made the greatest contribution toward safe, timely, and cost-effective clean up. Following the accomplishment section is an overall fiscal year-to-date summary analysis addressing cost, schedule, and milestone performance. Overviews of safety ensue. The next segment of the Executive Summary, entitled Critical Issues, is designed to identify the high-level challenges to achieving cleanup progress. The next section includes FY 2000 EM Management Commitment High Visibility Project Milestones and Critical Few Performance Measures. The Key Integration Activities section follows next, highlighting PHMC activities that cross contractor boundaries and demonstrate the shared value of partnering with other Site entities to accomplish the work. Concluding the Executive Summary, a forward-looking synopsis of Upcoming Planned Key Events is provided.
Date:
October 1, 2000
Creator:
EDER, D.M.
Object Type:
Report
System:
The UNT Digital Library