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Physical effects of infrared quark eigenmodes in LQCD
A truncated determinant algorithm is used to study the physical effects of the quark eigenmodes associated with eigenvalues below 300 MeV. This initial study focuses on coarse lattices (with O(a{sup 2}) improved gauge action), light internal quark masses and large physical volumes. Four bellweather full QCD processes are discussed: topological charge distributions, the eta prime propagator, string breaking as observed in the static energy and the rho decay into two pions.
Date:
October 7, 1999
Creator:
A. Duncan, E. Eichten and H. Thacker
Object Type:
Article
System:
The UNT Digital Library
Chamber and target technology development for inertial fusion energy
Fusion chambers and high pulse-rate target systems for inertial fusion energy (IFE) must: regenerate chamber conditions suitable for target injection, laser propagation, and ignition at rates of 5 to 10 Hz; extract fusion energy at temperatures high enough for efficient conversion to electricity; breed tritium and fuel targets with minimum tritium inventory; manufacture targets at low cost; inject those targets with sufficient accuracy for high energy gain; assure adequate lifetime of the chamber and beam interface (final optics); minimize radioactive waste levels and annual volumes; and minimize radiation releases under normal operating and accident conditions. The primary goal of the US IFE program over the next four years (Phase I) is to develop the basis for a Proof-of-Performance-level driver and target chamber called the Integrated Research Experiment (IRE). The IRE will explore beam transport and focusing through prototypical chamber environment and will intercept surrogate targets at high pulse rep-rate. The IRE will not have enough driver energy to ignite targets, and it will be a non-nuclear facility. IRE options are being developed for both heavy ion and laser driven IFE. Fig. 1 shows that Phase I is prerequisite to an IRE, and the IRE plus NIF (Phase II) is prerequisite …
Date:
April 7, 1999
Creator:
Abdou, M.; Besenbruch, G.; Duke, J.; Forman, L.; Goodin, D.; Gulec, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Electricity Restructuring Background: Public Utility Holding Company Act of 1935 (PUHCA)
This report provides background information on PUHCA, including its history and impact. It also discusses how PUHCA reform fits into the current electric utility industry restructuring debate. This report will be updated as events warrant. For related information on electricity restructuring, see the CRS Electronic Briefing Book.
Date:
January 7, 1999
Creator:
Abel, Amy
Object Type:
Report
System:
The UNT Digital Library
Experimental Investigation of In Situ Cleanable HEPA Filters
For the past several years studies have been conducted to investigate the use of innovative, alternative approaches to conventional disposable high efficiency particulate air filters.
Date:
January 7, 1999
Creator:
Adamson, D.J.
Object Type:
Report
System:
The UNT Digital Library
Fuel-flexible partial oxidation reforming of hydrocarbons for automotive applications.
Micro-reactor tests indicate that our partial oxidation catalyst is fuel-flexible and can reform conventional (gasoline and diesel) and alternative (ethanol, methanol, natural gas) fuels to hydrogen rich product gases with high hydrogen selectivity. Alcohols are reformed at lower temperatures (< 600 C) while alkanes and unsaturated hydrocarbons require slightly higher temperatures. Cyclic hydrocarbons and aromatics have also been reformed at relatively low temperatures, however, a different mechanism appears to be responsible for their reforming. Complex fuels like gasoline and diesel, which are mixtures of a broad range of hydrocarbons, require temperatures of > 700 C for maximum hydrogen production.
Date:
June 7, 1999
Creator:
Ahmed, S.; Carter, J. D.; Kopasz, J. P.; Krumpelt, M. & Wilkenhoener, R.
Object Type:
Article
System:
The UNT Digital Library
Partial Oxidation Fuel Reforming for Automotive Power Systems
For widespread use of fuel cells to power automobiles in the near future, it is necessary to convert gasoline or other transportation fuels to hydrogen on-board the vehicle. Partial oxidation reforming is particularly suited to this application as it eliminates the need for heat exchange at high temperatures. Such reformers offer rapid start and good dynamic performance. Lowering the temperature of the partial oxidation process, which requires the development of a suitable catalyst, can increase the reforming efficiency. Catalytic partial oxidation (or autothermal) reformers and non-catalytic partial oxidation reformers developed by various organizations are presently undergoing testing and demonstration. This paper summarizes the process chemistries as well as recent test data from several different reformers operating on gasoline, methanol, and other fuels.
Date:
September 7, 1999
Creator:
Ahmed, S.; Chalk, S.; Krumpelt, M.; Kumar, R. & Milliken, J.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 79, Ed. 1 Thursday, January 7, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 7, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 135, Ed. 1 Wednesday, April 7, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 7, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Comparison of InP/InGaAs HBT and InAlAs/InGaAs HBT for ULP Applications
The increased demand for portable electronics has lead to the need for higher performance and efficiency. Devices operating at less than 50 {micro}W of power are defined as ultra-low-power (ULP) devices. New progress has been achieved on InP/InGaAs HBT and InAIAs/InGaAs HBT optimized for ULP applications. f{sub T} values of 2.2 GHz, and f{sub MAX} values of 20 GHz have been obtained for HBTs operating at less than 40 {micro}W. Current gain is greater than 45 with the device operating at less than 20 {micro}A on a 2.5 x 5 {micro}m{sup 2} device. These devices have been significantly improved over the previously reported MOCVD grown InP/InGaAs ULP HBT which has f{sub MAX} of 10 GHz operating in the ultra-low-power level. The improvements have been attributed to the reduction of base dopant diffusion associated with Zn doping.
Date:
July 7, 1999
Creator:
Ashby, C. I. H.; Baca, A. G.; Chang, P. C.; Hafich, M. J.; Hietala, V. M. & Klem, J. F.
Object Type:
Article
System:
The UNT Digital Library
Progress Toward E-157: A 1 GeV Plasma Wakefield Accelerator
A plasma based wakefield acceleration (PWFA) experiment, scheduled to run this summer, will accelerate parts of a 28.5 GeV bunch from the SLAC linac by up to 1 GeV over a length of 1 meter. A single 28.5 GeV bunch will both induce the wakefields in the one meter long plasma and witness the resulting acceleration fields. The experiment will explore and further develop the techniques that are needed to apply high-gradient PWFA to large scale accelerators. This paper summarizes the goals of the first round of experiments as well as the status of the individual components: construction and diagnosis of the homogeneous lithium oven plasma source and associated ionization laser, commissioning of the electron beam, simulated performance of the electron beam energy measurement, and first PIC simulations of the full meter long experiment.
Date:
July 7, 1999
Creator:
Assmann, R
Object Type:
Report
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter,, November 1999
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
December 7, 1999
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Interval Assignment for Volumes with Holes
This paper presents a new technique for automatically detecting interval constraints for swept volumes with holes. The technique finds true volume constraints that are not necessarily imposed by the surfaces of the volume. A graphing algorithm finds independent, parallel paths of edges from source surfaces to target surfaces. The number of intervals on two paths between a given source and target surface must be equal; in general, the collection of paths determine a set of linear constraints. Linear programming techniques solve the interval assignment problem for the surface and volume constraints simultaneously.
Date:
September 7, 1999
Creator:
BENZLEY, STEVEN; MITCHELL, SCOTT A. & SHEPHERD, JASON F.
Object Type:
Article
System:
The UNT Digital Library
PFP Commercial Grade Food Pack Cans for Plutonium Handling and Storage Critical Characteristics
This document specifies the critical characteristics for Commercial Grade Items (CGI) procured for PFP's Vault Operations system as required by HNF-PRO-268 and HNF-PRO-1819. These are the minimum specifications that the equipment must meet in order to perform its safety function. The changes in these specifications have no detrimental effect on the descriptions and parameters related to handling plutonium solids in the authorization basis. Because no parameters or sequences exceed the limits described in the authorization bases, no accident or abnormal conditions are affected. The specifications prescribed in this critical characteristics document do not represent an unreviewed safety question.
Date:
December 7, 1999
Creator:
BONADIE, E.P.
Object Type:
Report
System:
The UNT Digital Library
1998 Annual Cathodic Protection Survey Report for the 242-A Evaporator Area
This report is the second annual cathodic protection report for the 242-A evaporator. The report documents and trends annual polarization survey data, rectifier inspection data, and continuity data from 1994 through mid-1999.
Date:
December 7, 1999
Creator:
BOWMAN, T.J.
Object Type:
Report
System:
The UNT Digital Library
High-flux source of fusion neutrons for material and component testing
The inner part of a fusion reactor will have to operate at very high neutron loads. In steady-state reactors the minimum fluence before the scheduled replacement of the reactor core should be at least l0-15 Mw.yr/m<sup>2</sup>. A more frequent replacement of the core is hardly compatible with economic constraints. A most recent summary of the discussions of these issues is presented in Ref. [l]. If and when times come to build a commercial fusion reactor, the availability of information on the behavior of materials and components at such fluences will become mandatory for making a final decision. This makes it necessary an early development and construction of a neutron source for fusion material and component testing. In this paper, we present information on one very attractive concept of such a source: a source based on a so called Gas Dynamic Trap. This neutron source was proposed in the mid 1980s (Ref. [2]; see also a survey [3] with discussion of the early stage of the project). Since then, gradual accumulation of the relevant experimental information on a modest-scale experimental facility GDT at Novosibirsk, together with a continuing design activity, have made initial theoretical considerations much more credible. We believe that …
Date:
January 7, 1999
Creator:
Baldwin, D. E.; Hooper, E. B.; Ryutov, D. D. & Thomassen, K. I.
Object Type:
Article
System:
The UNT Digital Library
Oak Ridge National Laboratory Old Hydrofracture Facility Waste Remediation Using the Borehole-Miner Extendible-Nozzle Sluicer
A borehole-miner extendible-nozzle sluicing system was designed, constructed, and deployed at Oak Ridge National Laboratory to remediate five horizontal underground storage tanks containing sludge and supernate at the ORNL Old Hydrofracture Facility site. The tanks were remediated in fiscal year 1998 to remove {approx}98% of the waste, {approx}3% greater than the target removal of >95% of the waste. The tanks contained up to 18 in. of sludge covered by supernate. The 42,000 gal of low level liquid waste were estimated to contain 30,000 Ci, with 97% of this total located in the sludge. The retrieval was successful. At the completion of the remediation, the State of Tennessee Department of Environment and Conservation agreed that the tanks were cleaned to the maximum extent practicable using pumping technology. This deployment was the first radioactive demonstration of the borehole-miner extendible-nozzle water-jetting system. The extendible nozzle is based on existing bore hole-miner technology used to fracture and dislodge ore deposits in mines. Typically borehole-miner technology includes both dislodging and retrieval capabilities. Both dislodging, using the extendible-nozzle water-jetting system, and retrieval, using a jet pump located at the base of the mast, are deployed as an integrated system through one borehole or riser. Note that …
Date:
October 7, 1999
Creator:
Bamberger, J. A. & Boris, G. F.
Object Type:
Report
System:
The UNT Digital Library
A New User-Friendly Model to Reduce Cost for Headwater Benefits Assessment
Headwater benefits at a downstream hydropower project are energy gains that are derived from the installation of upstream reservoirs. The Federal Energy Regulatory Commission is required by law to assess charges of such energy gains to downstream owners of non-federal hydropower projects. The high costs of determining headwater benefits prohibit the use of a complicated model in basins where the magnitude of the benefits is expected to be small. This paper presents a new user-friendly computer model, EFDAM (Enhanced Flow Duration Analysis Method), that not only improves the accuracy of the standard flow duration method but also reduces costs for determining headwater benefits. The EFDAM model includes a MS Windows-based interface module to provide tools for automating input data file preparation, linking and executing of a generic program, editing/viewing of input/output files, and application guidance. The EDFAM was applied to various river basins. An example was given to illustrate the main features of EFDAM application for creating input files and assessing headwater benefits at the Tulloch Hydropower Plant on the Stanislaus River Basin, California.
Date:
July 7, 1999
Creator:
Bao, Y.S.; Cover, C.K.; Perlack, R.D.; Sale, M.J. & Sarma, V.
Object Type:
Article
System:
The UNT Digital Library
A Combinatorial Approach to Determine Mechanisms of Atmospheric Copper Sulfidation
Parallel microscopic experimentation (the combinatorial approach often used in solid-state science) was applied to characterize atmospheric copper corrosion behavior. Specifically, this technique permitted relative sulfidation rates to be determined for copper containing different levels of point defects and impurities (In, Al, O, and D). Corrosion studies are inherently difficult because of complex interactions between material interfaces and the environment. The combinatorial approach was demonstrated using micron-scale Cu lines that were exposed to a humid air environment containing sub-ppm levels of H{sub 2}S. The relative rate of Cu{sub 2}S growth was determined by measuring the change in resistance of the line. The data suggest that vacancy trapping by In and Al impurities slow the sulfidation rate. Increased sulfidation rates were found for samples containing excess point defects or deuterium. Furthermore, the sulfidation rate of 14 {micro}m wide Cu lines was increased above that for planar films.
Date:
October 7, 1999
Creator:
Barbour, J. Charles; Braithwaite, Jeffrey W.; Copeland, Robert Guild; Dunn, Roberto G.; Minor, Kenneth G.; Missert, Nancy A. et al.
Object Type:
Article
System:
The UNT Digital Library
Molecular Environmental Science and Synchrotron Radiation Facilities An Update of the 1995 DOE-Airlie Report on Molecular Environmental Science
This workshop was requested by Dr. Robert Marianelli, Director of the DOE-BES Chemical Sciences Division, to update the findings of the Workshop on Molecular Environmental Sciences (MES) held at Airlie, VA, in July 1995. The Airlie Workshop Report defined the new interdisciplinary field referred to as Molecular Environmental Science (MES), reviewed the synchrotron radiation methods used in MES research, assessed the adequacy of synchrotron radiation facilities for research in this field, and summarized the beam time requirements of MES users based on a national MES user survey. The objectives of MES research are to provide information on the chemical and physical forms (speciation), spatial distribution, and reactivity of contaminants in natural materials and man-made waste forms, and to develop a fundamental understanding of the complex molecular-scale environmental processes, both chemical and biological, that affect the stability, transformations, mobility, and toxicity of contaminant species. These objectives require parallel studies of ''real'' environmental samples, which are complicated multi-phase mixtures with chemical and physical heterogeneities, and of simplified model systems in which variables can be controlled and fundamental processes can be examined. Only by this combination of approaches can a basic understanding of environmental processes at the molecular-scale be achieved.
Date:
May 7, 1999
Creator:
Bargar, John R
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 40, No. 1, Ed. 1 Thursday, January 7, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 7, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
News Bulletin (Castroville, Tex.), Vol. 41, No. 40, Ed. 1 Thursday, October 7, 1999
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
October 7, 1999
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Multispectral Thermal Imager (MTI) Payload Overview
MTI is a comprehensive research and development project that includes up-front modeling and analysis, satellite system design, fabrication, assembly and testing, on-orbit operations, and experimentation and data analysis. The satellite is designed to collect radiometrically calibrated, medium resolution imagery in 15 spectral bands ranging from 0.45 to 10.70 pm. The payload portion of the satellite includes the imaging system components, associated electronics boxes, and payload support structure. The imaging system includes a three-mirror anastigmatic off-axis telescope, a single cryogenically cooled focal plane assembly, a mechanical cooler, and an onboard calibration system. Payload electronic subsystems include image digitizers, real-time image compressors, a solid state recorder, calibration source drivers, and cooler temperature and vibration controllers. The payload support structure mechanically integrates all payload components and provides a simple four point interface to the spacecraft bus. All payload components have been fabricated and tested, and integrated.
Date:
July 7, 1999
Creator:
Bender, S. C.; Brock, B. C.; Bullington, D. M.; Byrd, D. A.; Claassen, P. J.; Decker, M. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Retrospective application of online catalog author authority control: A pilot project
A total of 56 author authority records were created or revised in the Fermilab online catalog. An example of a correct author authority record is given. Since the author authority records used 400 fields and thus pipe all the variant names to the one record, any additions of records with any of these variants will be handled by the online catalog. It is likely that we have included most of the common variants of key Fermilab authors' names, so the database should stay cleaner and more functional for years to come. This project was a success. Therefore an immediate future plan is to implement additional author authority records for the remainder of the authors in the database. Afterwards, authority maintenance should be built in to Library work processes as an ongoing task.
Date:
July 7, 1999
Creator:
Berkhout, Therese A. & Tompson, Sara R.
Object Type:
Report
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 69, No. 145, Ed. 1 Tuesday, December 7, 1999
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
December 7, 1999
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History