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545 Matching Results
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High beta and second stability region transport and stability analysis
This document describes ideal and resistive MHD studies of high-beta plasmas and of the second stability region. Significant progress is reported on the resistive stability properties of high beta poloidal supershot'' discharges. For these studies initial profiles were taken from the TRANSP code which is used extensively to analyze experimental data. When an ad hoc method of removing the finite pressure stabilization of tearing modes is implemented it is shown that there is substantial agreement between MHD stability computation and experiment. In particular, the mode structures observed experimentally are consistent with the predictions of the resistive MHD model. We also report on resistive stability near the transition to the second region in TFTR. Tearing modes associated with a nearby infernal mode may explain the increase in MHD activity seen in high beta supershots and which impede the realization of Q{approximately}1. We also report on a collaborative study with PPPL involving sawtooth stabilization with ICRF.
Date:
September 5, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
In-Home Performance of Exempt Pellet Stoves in Medford, Oregon.
Pellet stoves that are considered exempt'' operate at an air-to-fuel ratio in excess of 35:1. They therefore qualify for exemption from the emissions certification process. A primary goal of this project was to determine how a sample of such stoves, operated in homes, would perform compared to their certified cousins,'' which were evaluated the previous year. In-home performance data documenting emissions from exempt stoves and net delivered efficiencies was particularly desired. This project evaluated six pellet stoves representing three major brands in Medford, Oregon. There were three Breckwell model P24FS, one Horizon Eclipse, one Horizon Destiny, and one Earth Stove TP40. The stoves were monitored for four week-long intervals in January and February 1991, for a total of 24 tests. Evaluations were conducted for particulate, CO (carbon monoxide) and PAH (polycyclic aromatic hydrocarbon) emissions and net efficiency. Monitoring was conducted using the AWES (automated woodstove emissions sampler) sampling system. A new data logger, developed for this project, was used to control the AWES and record real time data. 22 refs., 17 figs., 6 tabs.
Date:
July 5, 1991
Creator:
Barnett, Stockton G. & Fields, Paula G.
Object Type:
Report
System:
The UNT Digital Library
Mechanisms of defect production and atomic mixing in high energy displacement cascades: A molecular dynamics study
We have performed molecular dynamics computer simulation studies of displacement cascades in Cu at low temperature. For 25 keV recoils we observe the splitting of a cascade into subcascades and show that cascades in Cu may lead to the formation of vacancy and interstitial dislocation loops. We discuss a new mechanism of defect production based on the observation of interstitial prismatic dislocation loop punching from cascades at 10 K. We also show that below the subcascade threshold, atomic mixing in the cascade is recoil-energy dependent and obtain a mixing efficiency that scales as the square root of the primary recoil energy. 44 refs., 12 figs.
Date:
June 5, 1991
Creator:
Diaz de la Rubia, T. & Guinan, M.W.
Object Type:
Article
System:
The UNT Digital Library
Ductile-Brittle Transition Temperature testing of tungsten using the three-point bend test
Three-point bend tests were performed to determine the Ductile-Brittle Transition Temperatures (DBTTs) of forged and chemical vapor deposition (CVD) tungsten. Testing was performed under quasi-static conditions at temperatures between 23{degrees}C and 450{degrees}C using a forced-air environmental chamber. Load-displacement data from the three-point bend tests indicated that the constitutive behavior of the materials tested varied considerably. Finite element modeling of the three-point bend test was performed to investigate plastic strains induced in the samples during testing as a function of constitutive behavior. The modeling assumed plane stress conditions in the sample and simple bi-linear elastic-plastic constitutive behavior of the test material. The strains induced in the samples were found to be functions of both the yield stress and work hardening behavior of the materials. The use of the three-point bend test to determine DBTT, and the DBTTs reported for the test materials, are discussed relative to the modeling results. It is concluded that the three-point bend test has some utility in the determination of DBTTs if some caution is used in the selection of test parameters and fixture geometries. However, the three-point bed test does not provide a complete picture of the nature of the ductile-brittle transition. 12 refs., 9 figs.
Date:
March 5, 1991
Creator:
Lassila, D.H.; Magness, F. & Freeman, D.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0148.0045]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "If we can get a definition, we would like to work with you on this," said Leo Cravens, Oklahoma State Homeowners Association."
Date:
November 5, 1991
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0158.0500]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Pro-war and anti-war demonstrations, separated by a tape strung by campus police."
Date:
February 5, 1991
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0358]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Cross, George L. Dr. / Former President of OU"
Date:
November 5, 1991
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0164.0103]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Elvis, a hearing dog, awakens a "sleeping" Melanie Blackburn of Oklahoma City, a trainer for Dog Ears Inc., during a demonstration at the recent annual spring convention of the Oklahoma Speech and Hearing Association."
Date:
April 5, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0642]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Director Bob Daniels, left, and Bill Jeffers, right, hold a pre-show conference with Mark Cornetti, the Curley of 'Oklahoma !"
Date:
July 5, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0280]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Cross, George L. (Dr.) Former President of OU"
Date:
November 5, 1991
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0644]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A Wooded setting at Discoveryland theater forms a natural stage for a classic show"
Date:
July 5, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0141.0278]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Joe Kinder, James Hopper and Don Connel, from left."
Date:
April 5, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0415]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Roy Cooper goes to work during the first go-round Saturday night at the Lazy E Arena."
Date:
October 5, 1991
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0107]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Standing with their Distinguished Government Service Awards Tuesday from the Oklahoma City Federal Executive Council are, from left; mark k. Donaldson, equipment cleaner at Tinker Air Force Base; Pattie S. Maynard, system design analyst at Tinker Air Forces Base; Myrtle F. Dimick, staffing clerk at the federal Oklahoma city Area Office of Personnel management; Thurman H. Wagoner, supervisory military personnel clerk at the Oklahoma City military entrance processing center; Betty J. Copper nursing assistant at the veterans Administration Medical Center and George M. Volway, medical equipment repairer at the VA medical center."
Date:
November 5, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0313B.0745]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Molly Ringwald look-alike Christine Jeske."
Date:
June 5, 1991
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0306B.0199]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Each U-shaped "pod" in Oklahoma county's new $43.5 million jail will house 50 prisoners , one per 70-square-foot cell."
Date:
July 5, 1991
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Effects of doping on hybridization gapped materials
Doping studies are presented on three materials exhibiting hybridization gaps: Ce{sub 3}Bi{sub 4}Pt{sub 3}, U{sub 3}Sb{sub 4}Pt{sub 3}, and CeRhSb. In the case of trivalent La, Y, or Lu substituting for Ce or U, there is a suppression of the low temperature gap and an increase in the electronic specific heat, {gamma}. In the case of tetravalent Th substitutions for U there is no change in {gamma} and in the case of tetravalent Zr substitution for Ce in CeRhSb, there is an enhanced semiconductor-like behavior in the electrical resistance. These results are discussed in the light of a simple model of hybridization gapped systems. 12 refs., 3 figs.
Date:
June 5, 1991
Creator:
Canfield, P. C.; Thompson, J. D.; Hundley, M. F.; Lacerda, A. & Fisk, Z.
Object Type:
Article
System:
The UNT Digital Library
Cedar Project---Original goals and progress to date
This report describes: Cedar System Hardware; Compiler and Software Issues on Memory Management; Operating Systems; Compilers; and Multiprocessor Performance on Algorithms and Applications.
Date:
September 5, 1991
Creator:
Cybenko, G.; Kuck, D.; Padua, D. & Gallopoulos, E.
Object Type:
Report
System:
The UNT Digital Library
Reactor Operations Management Plan
The K-Reactor last operated in April 1988. At that time, K-Reactor was one of three operating reactors at the Savannah River Site (SRS). Following an incident in P-Reactor in August 1988, it was decided to discontinue SRS reactor operation and conduct an extensive program to upgrade operating practices and plant hardware prior to restart of any of the reactors. The K-reactor was the first of three reactors scheduled to resume production. At the present time, it is the only reactor with planned restart. WSRC assumed management of SRS on April 1, 1989. WSRC established the Safety Basis for Restart and a listing of the actions planned to satisfy the Safety Basis. In consultation with DOE, it was determined that proper management of the restart activities would require a single plan that integrated the numerous activities. The plan was entitled the Reactor Operations Management Plan and is referred to simply as the ROMP. The initial version of ROMP was produced in July of 1989. Subsequent modifications led to Revision 3 which was approved by DOE in May, 1990. Other changes were made in a formal change process, resulting in the latest version, Revision 5, being issued in October, 1990. The ROMP …
Date:
December 5, 1991
Creator:
Rice, P.D.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0328.0254]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "George Keyes talks with a studio technician. (Oklahoma County Assessor takes up songwriting at age 67)"
Date:
July 5, 1991
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0328.0034]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Democratic presidential hopeful Sen. Bob Kerrey gestures Friday outside the Statehouse in Concord N. H. as he speaks about health care in the United during his first full day of campaigning in N. H."
Date:
October 5, 1991
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0229.0350]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Col. Amzi Gregory, left, of the Oklahoma Air National Guard discusses repairs to a Royal Saudi Air Force plane with crew members."
Date:
March 5, 1991
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0257.0471]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "William Beaty, above right, and Jack Herron, with thumbs up, remind people of Gen. Norman Schwarzkopf."
Date:
June 5, 1991
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0253.0496]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
January 5, 1991
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History