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34
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19
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9
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7
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6
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5
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Oklahoma Publishing Company Photography Collection
143
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116
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86
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56
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50
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19
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1 - 24 of
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Symplectic numerical integration of Hamiltonian systems
This paper describes some general techniques available for symplectic or Lie-Poisson integration and illustrate the results with some numerical computations. In this spirit, I also discuss reversible integration, equivariant integration, integration of volume preserving flows, and symplectic cellular automata. My intention is not to be exhaustive but to give a representative review. 76 refs., 5 figs.
Date:
September 11, 1989
Creator:
Scovel, C.
Object Type:
Article
System:
The UNT Digital Library
Writing Parallel, Discrete-Event Simulations in Modsim: Insight and Experience
The Time Warp Operating System (TWOS) has been the focus of much research in parallel simulation. A new language, called ModSim, has been developed for use in conjunction with TWOS. The coupling of ModSim and TWOS provides a tool to construct large, complex simulation models that will run on several parallel and distributed computer systems. As part of the Griffin Project'' underway here at Los Alamos National Laboratory, there is strong interest in assessing the coupling of ModSim and TWOS from an application-oriented perspective. To this end, a key component of the Eagle combat simulation has been implemented in ModSim for execution on TWOS. In this paper brief overviews of ModSim and TWOS will be presented. Finally, the compatibility of the computational models presented by the language and the operating system will be examined in light of experience gained to date. 18 refs., 4 figs.
Date:
September 11, 1989
Creator:
Rich, D.O. & Michelsen, R.E.
Object Type:
Article
System:
The UNT Digital Library
Underground muon observations in the Soudan 2 detector
The Soudan 2 nucleon decay detector has recorded data since Summer 1988 using a quarter (dimensions 4 m by 8 m by 5 m high) of the eventual detector. This iron-argon time projection chamber records extensive data on each event and has excellent angular and multi-track resolution. We describe the trigger, the event analysis procedure and the current status of the detector and the underground muon data sample. 1 ref.
Date:
September 11, 1989
Creator:
Allison, W. W. M.; Barr, G. D.; Brooks, C. B.; Cobb, J. H.; Kirby-Gallagher, L. M.; Giles, R. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Underground muons from the direction of Cygnus X-3
We report on 3.2 years live time of underground muon observations taken between 1981 and 1989 using the Soudan 1 proportional tube detector, located at a depth of 1800 m water equivalent. The post-1984 observations are consistent with our earlier data on an excess signal apparently correlated with the Cygnus X-3 orbital period. The signal-to-background ratio in the entire data sample is 1 to 3 percent, depending on phase width. 10 refs., 2 figs., 1 tab.
Date:
September 11, 1989
Creator:
Johns, K.; Marshak, M. L.; Peterson, E. A.; Ruddick, K.; Shupe, M.; Ayres, D. S. et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0119A.0176]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "No stopping him New York Jets Dennis Byrd (90) rides on the back of Pittsburgh Steelers quarterback Rick Strom (11) as Strom dives to recover his fumble in the fourth quarter Sunday in East Rutherford, N.J."
Date:
December 11, 1989
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Faculty Recital: 1989-10-11 - Robert Davidovici, violin
Access:
Use of this item is restricted to the UNT Community
A faculty recital performed at the UNT College of Music Recital Hall.
Date:
October 11, 1989
Creator:
Davidovici, Robert
Object Type:
Sound
System:
The UNT Digital Library
[Photograph 2012.201.B0074.0366]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jay's Tonnette Mouse, left, Cynthia Baldwin, center, and Stephanie Campbell grieve Saturday's 68-61 loss to Kingfisher."
Date:
March 11, 1989
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0117.0008]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Douglass' Fred Burley has caught the attention of college recruits after averaging 20.4 points and 12 rebounds a game this season."
Date:
January 11, 1989
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Texas Program Gives Gifted Math and Science Students Chance to Finish School and Start College Simulataneously
Article about the Texas Academy of Mathematics and Science, its students, the requirements, and the regulations.
Date:
October 11, 1989
Creator:
Mangan, Katherine S.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0136.0502]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Walter Dale Clayton, Del City, received a master's of divinity degree from New Orleans Baptist Theological Seminary."
Date:
January 11, 1989
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0202]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
November 11, 1989
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0141.0075]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "McGuiness guard Nick Conger reads the defense as Millwood's Derrick Coleman applies the pressure during Saturday's Class 3A title game."
Date:
March 11, 1989
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0148.0046]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "LuAnn Cravens, Phyllisjean Newman, Madalynne Norick and Dotti Orcutt, from left"
Date:
December 11, 1989
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Anne Burnett and Charles D. Tandy Foundation
A financial data report from the Anne Burnett and Charles D. Tandy Foundation for the tax year starting from 1984 to 1988. The data is tallied by how much assets the museum had at the end of the year and the amount they've awarded in grants.
Date:
July 11, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Helen Irwin Littauer Education Trust
A financial data report for the Helen Irwin Littauer Educational Trust. The financial report lists the foundations assets by the years from 1984 to 1988 and the supporting grant they awarded for that year as well. In the additional information, deadline: must be submitted annually, has been underlined.
Date:
July 11, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ion related problems for the XLS ring
The electron beam in the XLS will collide with the residual gas in the vacuum chamber. The positive ions will be trapped in the potential well of the electron beam. They will perform stable or unstable oscillations around the beam under the repetitive Coulomb force of the bunches. If not cleared, the captured ions will lead to partial or total neutralization of the beam, causing both, a decrease of life-time and a change in the vertical tunes as well as an increase in the tune-spread. They can also cause coherent transverse instabilities. The degree of neutralization {theta} that one can tolerate, is primarily determined by the allowable tune shift, which of the XLS is between 1 and 5 10{sup {minus}3}. Electrostatic clearing electrodes will be used to keep the neutralization below the desired limit. In order to determine their location and the necessary clearing-rate and voltage, we examine the ion production rate, longitudinal velocity of ions in field-free regions and in the dipoles to see what distance the ions can travel without clearing before the neutralization of the beam reaches the prescribed limit, beam potential to see the locations of the potential wells, voltage requirements for ion clearing, critical mass …
Date:
July 11, 1989
Creator:
Bozoki, E. & Halama, H. (Brookhaven National Lab., Upton, NY (USA))
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0229.0318]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Former attorney Carroll E. Gregg, in chains, is brought into the Oklahoma County courthouse to face child rape and child pornography charges."
Date:
October 11, 1989
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0250.0879]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Keith Harris concentrates on a putt Monday at The Daily Oklahoman Open qualifying at Oak Country Club."
Date:
September 11, 1989
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0312B.0374]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edward C. Joullian III says Oklahoma's history is a valuable source of knowledge and an enlightening repository of markers along the path to the future."
Date:
April 11, 1989
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0353.0502]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Strong winds and freezing temperatures in Oklahoma turned whitecaps into icecaps Monday at Lake Overholser."
Date:
October 11, 1989
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0269.0151]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "James Huff, a teacher at Douglass High School on Oklahoma City, discusses the fall of Berlin Wall and its ramifications to his first-hour geography class."
Date:
October 11, 1989
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0252.0305]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mike Hawk drives to a second-place finish in a finals heat for the 800 meters at the The Daily Oklahoman Track Classic on Saturday."
Date:
February 11, 1989
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0270.0618]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Carolyn Humphrey adjusts a costume she made for price candidate Justin Holmes."
Date:
September 11, 1989
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0352.0655]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Helen Kjellander of Sweden and bruce Neville of Australia recorded their first tour wins in women's slalom and men's jumping, respectively, whilw Andy Mapple (Deena's husband) took the men's slalom crown."
Date:
June 11, 1989
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History