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EFFECTS OF XE ION IRRADIATION AND SUBSEQUENT ANNEALING ON THE PROPERTIES OF MAGNESIUM-ALUMINATE SPINEL
Single crystals of magnesium-aluminate spinel MgAl{sub 2}O{sub 4} were irradiated with 340 keV Xe{sup 2} ions at {minus}173 C ({approximately} 100 K). A fluence of 1 x 10{sup 20} Xe/m{sup 2} created an amorphous layer at the surface of the samples. The samples were annealed for 1 h at different temperatures ranging from 130 C to 880 C. Recrystallization took place in the temperature interval between 610 C and 855 C. Transmission electron microscopy (TEM) images show two distinct layers near the surface: (1) a polycrystalline layer with columnar grain structure; and (2) a buried damaged layer epitaxial with the substrate. After annealing at 1100 C for 52 days, the profile of implanted Xe ions did not change, which means that Xe ions are not mobile in the spinel structure up to 1100 C. The thickness of the buried damaged layer decreased significantly in the 1100 C annealed sample comparing to the sample annealed for 1 h at 855 C.
Date:
April 1, 2000
Creator:
AFANASYEV, I. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Evaluation of the Cask Transportation Facility Modifications (CTFM) compliance to DOE order 6430.1A Project A.5 and A.6
This report was prepared to evaluate the compliance of CTFM to DOE Order 6430.1A. This document presents the results of an evaluation that was performed to assess compliance of the K West (KW) Cask Transportation Facility Modifications (CTFM) designs against applicable requirements of Department of Energy (DOE) Order 6430.1 A, General Design Criteria. This evaluation was grouped under two categories described as Cask Loadout System (CLS) and Cranes/Other Modifications.
Date:
April 24, 2000
Creator:
ARD, K.E.
Object Type:
Report
System:
The UNT Digital Library
Spent Nuclear Fuel (SNF) Project Cask and MCO Helium Purge System Design Review Completion Report Project A.5 and A.6
This report documents the results of the design verification performed on the Cask and Multiple Canister Over-pack (MCO) Helium Purge System. The helium purge system is part of the Spent Nuclear Fuel (SNF) Project Cask Loadout System (CLS) at 100K area. The design verification employed the ''Independent Review Method'' in accordance with Administrative Procedure (AP) EN-6-027-01.
Date:
April 19, 2000
Creator:
ARD, K.E.
Object Type:
Report
System:
The UNT Digital Library
Ideas and concepts for diagnosis of performance and evaluation of data reliability based upon ARSA state-of-health (SOH) data
At the current time, the Pacific Northwest National Laboratory (PNNL) prototype for the Automated Radioxenon Sampler/Analyzer (ARSA) automatically transmits, on a daily basis, a subset of all state-of-health (SOH) data in an e-mail data file to a limited number of recipients. These variables represent what were considered the most critical physical parameters for the ARSA's operation at the beginning of the field demonstration in Freiburg, Germany. Operators at PNNL perform a daily review of the information in the data file for anomalous operational conditions as evidenced by sensor readings. The initial review is easily implemented by plotting the various sensor data versus time and looking for gross deviations in the periodicity of the variables compared to previous sample sensor data. After viewing the 24-hr graphical plots, if necessary, a review is conducted of the tabular data of specific sensor anomalies. In most cases, the experience has been that when there is an ARSA operational problem the data file will have multiple sensor readings that reflect some aspect of the problem.
Date:
April 27, 2000
Creator:
Abel, KH; Bowyer, TW; Hayes, JC; Heimbigner, TR; Panisko, ME; McIntyre, JI et al.
Object Type:
Report
System:
The UNT Digital Library
Ideas and Concepts for Diagnosis of Performance and Evaluation of Data Reliability Based Upon ARSA State-of-Health (SOH) Data
At the current time the Pacific Northwest National Laboratory (PNNL) prototype for the Automated Radioxenon Sampler/Analyzer (ARSA) automatically transmits, on a daily basis, a subset of all state-of-health (SOH) data in an e-mail data file to a limited distribution of participants.
Date:
April 27, 2000
Creator:
Abel, Keith H.; Bowyer, Ted W.; Hayes, James C.; Heimbigner, Tom R.; Panisko, Mark E.; McIntyre, Justin I. et al.
Object Type:
Report
System:
The UNT Digital Library
Polycube Oxidation and Factors Affecting the Concentrations of Gaseous Products
The degraded polycube samples were tested in air and argon/oxygen atmospheres to determine the effect of size increase on the flammable gases concentrations. Within the size range tested, the flammable gas generation rate increases with increasing size but the extrapolation of the data to actual processing polycube size yielded flammable gas species concentration in the off-gas stream below the lower flammable limit of all the major gas species identified. Extreme surface area increase with a powder sample showed no significant effect on the flammable gas generation rate. The polycube went through the thermal stabilization process by undergoing both pyrolysis and oxidation generating at the end a plutonium oxide powder that showed unmeasurable weight change at 1273 K.
Date:
April 4, 2000
Creator:
Abrefah, John; MacFarlan, Paul J. & Sell, Rachel L.
Object Type:
Text
System:
The UNT Digital Library
Comments on the paper entitled "Determination of the equilibrium constant for complex formation in a binary mixture of chloroform and triethylamine from viscosity data on the basis of the ideal associated solution model"
Article commenting on the paper entitled "Determination of the equilibrium constant for complex formation in a binary mixture of chloroform and triethylamine from viscosity data on the basis of the idea associated solution model"
Date:
April 2000
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
First year operational experience with the Cherenkov Detector (DIRC) of BaBar
The DIRC (acronym for Detection of Internally Reflected Cherenkov (light)) is a new type of Cherenkov ring imaging detector based on total internal reflection that is used for the first time in the BaBar detector at PEP-II ring of SLAC. The Cherenkov radiators are long rectangular bars made of synthetic fused silica. The photon detector is a water tank equipped with an array of 10,752 conventional photomultipliers. The first year operational experience in the BaBar detector is presented using cosmic data and collision data in the energy region of the Y(4s) resonance.
Date:
April 1, 2000
Creator:
Adam, I. & Collaboration, BaBar
Object Type:
Article
System:
The UNT Digital Library
Effect of Radiation on Spinel Ceramics for Permanent Containers for Nuclear Waste Transportation and Storage.
None
Date:
April 30, 2000
Creator:
Adams, J.; Cowgill, M.; Moskowitz, P. & Rokhvarger, A.
Object Type:
Article
System:
The UNT Digital Library
Effect of Radiation on Spinel Ceramics for Permanent Containers for Nuclear Waste Transportation and Storage.
None
Date:
April 30, 2000
Creator:
Adams, J.; Cowgill, M.; Moskowitz, P. & Rokhvarger, A.
Object Type:
Article
System:
The UNT Digital Library
Tank Characterization Report for Single Shell Tank 241-C-104
Interprets information about the tank answering a series of six questions covering areas such as information drivers, tank history, tank comparisons, disposal implications, data quality and quantity, and unique aspects of the tank.
Date:
April 6, 2000
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Tank Characterization Report for Single Shell Tank 241-U-102
None
Date:
April 11, 2000
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Quarterly Progress Report - Biological Monitoring Program for East Fork Poplar Creek
In May 1985, a National Pollutant Discharge Elimination System (NPDES) permit was issued for the Oak Ridge Y-12 Plant. As a condition of the permit, a Biological Monitoring and Abatement Program (BMAP) was developed to demonstrate that the effluent limitations established for the Y-12 Plant protect the classified uses of the receiving stream (East Fork Poplar Creek; EFPC), in particular, the growth and propagation of aquatic life (Loar et al. 1989). A second objective of the BMAP is to document the ecological effects resulting from the implementation of a water pollution control program designed to eliminate direct discharges of wastewaters to EFPC and to minimize the inadvertent release of pollutants to the environment. Because of the complex nature of the discharges to EFPC and the temporal and spatial variability in the composition of the discharges, a comprehensive, integrated approach to biological monitoring was developed. A new permit was issued to the Y-12 Plant on April 28, 1995 and became effective on July 1, 1995. Biological monitoring continues to be required under the new permit. The BMAP consists of four major tasks that reflect different but complementary approaches to evaluating the effects of the Y-12 Plant discharges on the aquatic integrity …
Date:
April 18, 2000
Creator:
Adams, S. M.; Christensen, S. W.; Greeley, M. S. Jr.; Hill, W. R.; McCarthy, J. F.; Peterson, M. J. et al.
Object Type:
Report
System:
The UNT Digital Library
Report to Congress
Final report of the Advisory Commission on Electronic Commerce describing their activities and findings regarding the development of electronic commerce and its impact on the U.S. economy. The report includes sections on the background of electronic commerce, domestic tax issues, and international tax issues.
Date:
April 2000
Creator:
Advisory Commission on Electronic Commerce
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2000-04-22 - African Percussion Ensemble
An African percussion concert performed at the UNT College of Music WInspear Hall.
Date:
April 22, 2000
Creator:
African Percussion Ensemble
Object Type:
Sound
System:
The UNT Digital Library
Notes on Switching between Proton and gold Operation in Booster and AGS
N/A
Date:
April 1, 2000
Creator:
Ahrens, L. A. & Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
System Requirements Document for the Molten Salt Reactor Experiment
The purpose of the conversion process is to convert the {sup 233}U fluoride compounds that are being extracted from the Molten Salt Reactor Experiment (MSRE) equipment to a stable oxide for long-term storage at Bldg. 3019.
Date:
April 1, 2000
Creator:
Aigner, R. D.
Object Type:
Report
System:
The UNT Digital Library
Investigation of Mixed Metal Sorbent / Catalysts for the Simultaneous Removal of Sulfur and Nitrogen Oxides
Simultaneous removal of SO{sub 2} and NO{sub x} using a regenerable solid sorbent will constitute an important improvement over the use of separate processes for the removal of these two pollutants from stack gases and possibly eliminate several shortcomings of the individual SO{sub 2} and NO{sub x} removal operations. The work done at PETC and the DOE-funded investigation of the investigators on the sulfation and regeneration of alumina-supported cerium oxide sorbents have shown that they can perform well at relatively high temperatures (823-900 K) as regenerable desulfurization sorbents. Survey of the recent literature shows that addition of copper oxide to ceria lowers the sulfation temperature of ceria down to 773 K, sulfated ceria-based sorbents can function as selective SCR catalysts even at elevated temperatures, SO{sub 2} can be directly reduced to sulfur by CO on CuO-ceria catalysts, and ceria-based catalysts may have a potential for selective catalytic reduction of NO{sub x} by methane. These observations indicate a possibility of developing a ceria-based sorbent/catalyst which can remove both SO{sub 2} and NO{sub x} from flue gases within a relatively wide temperature window, produce significant amounts of elemental sulfur during regeneration, and use methane for the selective catalytic reduction of NO{sub x}. …
Date:
April 10, 2000
Creator:
Akyurtlu, Ates & Akyurtlu, Jale F.
Object Type:
Report
System:
The UNT Digital Library
Laboratory directed research and development fy1999 annual report
The Lawrence Livermore National Laboratory (LLNL) was founded in 1952 and has been managed since its inception by the University of California (UC) for the U.S. Department of Energy (DOE). Because of this long association with UC, the Laboratory has been able to recruit a world-class workforce, establish an atmosphere of intellectual freedom and innovation, and achieve recognition in relevant fields of knowledge as a scientific and technological leader. This environment and reputation are essential for sustained scientific and technical excellence. As a DOE national laboratory with about 7,000 employees, LLNL has an essential and compelling primary mission to ensure that the nation's nuclear weapons remain safe, secure, and reliable and to prevent the spread and use of nuclear weapons worldwide. The Laboratory receives funding from the DOE Assistant Secretary for Defense Programs, whose focus is stewardship of our nuclear weapons stockpile. Funding is also provided by the Deputy Administrator for Defense Nuclear Nonproliferation, many Department of Defense sponsors, other federal agencies, and the private sector. As a multidisciplinary laboratory, LLNL has applied its considerable skills in high-performance computing, advanced engineering, and the management of large research and development projects to become the science and technology leader in those areas …
Date:
April 11, 2000
Creator:
Al-Ayat, R. A.
Object Type:
Report
System:
The UNT Digital Library
PROOF OF PRINCIPAL TEST TO FEED AND METER GRANULAR COAL INTO 450 psig GAS PRESSURE
The objective of this project is to demonstrate proof of principal to feed and meter granular coal into 450 psig gas pressure for use with pressurized fluidized bed combustors. This report summarizes work undertaken in the first quarter of 2000 in support of that objective. At the end of the last quarter the pump had been re-designed to incorporate a larger torque hub and provide a substantial increase in drive train strength to prevent recurrence of failures experienced during earlier testing. Additional modifications were incorporated to improve the performance of the disk seals by improved location and adjustability, and the outlet was modified to incorporate a method to allow rapid adjustment of the outlet sealing column length without pump disassembly and rework being required. This quarter has been largely spent in manufacture of the new parts required, and in initial assembly, alignment and pinning of the revised configuration. The assembly is now complete and the pump is ready for installation into the test rig for the final series of tests.
Date:
April 1, 2000
Creator:
Aldred, Derek L.
Object Type:
Report
System:
The UNT Digital Library
Direct Energy Exchange Enhancement in Distributed Injection Light Gas Launchers
It is not widely acknowledged or appreciated that conventional, two-stage light-gas launchers do not efficiently apply their high breech pressures to the design intent: accelerating the projectile. Our objective in this project was to carry out the analysis, design, construction, and testing of a new class of launchers that will address this limitation. Our particular application is to expand the pressure range of the conventional, two-stage gas launcher to overlap and validate the pressure regimes previously attainable only with shock waves generated by nuclear explosions, lasers, or multistage conventional explosions. That is, these launchers would have the capability to conduct--in a laboratory setting--high-velocity-impact, equation-of-state (EOS) measurements at up to 2-TPa (20 Mbar) pressure levels in high-Z materials. Our design entailed a new class of distributed-injection, gas-dynamic launchers that are designed to use a boat-tail projectile to overcome the fundamental gas-expansion phenomena known as escape velocity (the Riemann limit). Our program included analytical, numerical, and experimental studies of the fast gas release flow technique that is central to the success of our approach. The analyses led us to believe that, in a typical configuration, the pressure will be effectively applied to the projectile in a time short relative to its few-microsecond …
Date:
April 6, 2000
Creator:
Alger, T W; Finucane, R G; Hall, J P; Penetrante, B M & Uphaus, T M
Object Type:
Report
System:
The UNT Digital Library
Tanks Focus Area site needs assessment FY 2000
This report documents the process used by the Tanks Focus Area (TFA) to analyze and develop responses to technology needs submitted by five major U.S. Department of Energy (DOE) sites with radioactive tank waste problems, and the initial results of the analysis. The sites are the Hanford Site, Idaho National Engineering and Environmental Laboratory (INEEL), Oak Ridge Reservation (ORR), Savannah River Site (SRS), and West Valley Demonstration Project (WVDP). During the past year, the TFA established a link with DOE's Fernald site to exchange, on a continuing basis, mutually beneficial technical information and assistance.
Date:
April 11, 2000
Creator:
Allen, R. W.
Object Type:
Report
System:
The UNT Digital Library
Improving Paper Machine Efficiency
None
Date:
April 30, 2000
Creator:
Allun, Cyrus
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2000-04-22 - UNT African Percussion Ensemble
Access:
Use of this item is restricted to the UNT Community
Concert presented at Winspear Hall at the Murchison Performing Arts Center.
Date:
April 22, 2000
Creator:
Alorwoyie, Gideon Foli
Object Type:
Sound
System:
The UNT Digital Library