Language

Symplectic numerical integration of Hamiltonian systems (open access)

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 (open access)

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 (open access)

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 (open access)

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
[News Clip: AIDS Parkland] captions transcript

[News Clip: AIDS Parkland]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: STDs] captions transcript

[News Clip: STDs]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Bus Drivers] captions transcript

[News Clip: Bus Drivers]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Hispanic Hert] captions transcript

[News Clip: Hispanic Hert]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Judge Openings] captions transcript

[News Clip: Judge Openings]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 10pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Voting Hearing] captions transcript

[News Clip: Voting Hearing]

This story aired at 6pm.
Date: September 11, 1989
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[Press release Texas Human Rights Foundation: Trial date set in disciplinary action involving Dallas Judge Jack Hampton] (open access)

[Press release Texas Human Rights Foundation: Trial date set in disciplinary action involving Dallas Judge Jack Hampton]

Press release stating the details of Judge Jack Hampton's formal hearing with the Texas State Commission on Judicial Conduct.
Date: September 11, 1989
Creator: Texas Human Rights Foundation
Object Type: Text
System: The UNT Digital Library
Design wind speeds for high hazard, moderate hazard, important/low hazard and general use facilities at the Savannah River Site (open access)

Design wind speeds for high hazard, moderate hazard, important/low hazard and general use facilities at the Savannah River Site

The design wind speeds for High Hazard, Moderate Hazard, Important/Low Hazard and General Use facilities at the Savannah River Site are developed below using the procedures and site-specific hazards model required by DOE Order 6430.1A. These are less than the previously required Design Wind Speeds and are: (1) High Hazard (Maximum Resistance) Facility, 185 mph; (2) Moderate Hazard (High Resistance) Facility, 37 mph; (3) Important/Low Hazard (Intermediate) Facility, 83 mph; and, (4) General Use (Standard) Facility, 78 mph.
Date: September 11, 1989
Creator: King, H. H.
Object Type: Report
System: The UNT Digital Library
Texas Attorney General Opinion: LO89-72 (open access)

Texas Attorney General Opinion: LO89-72

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Request to provide the asker with guidelines in regard to whether a company may do business with the state if a state representative owns stock in the company or is a 50 percent owner of a company.
Date: September 11, 1989
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Texas Attorney General Opinion: LO89-73 (open access)

Texas Attorney General Opinion: LO89-73

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification; Whether the Texas nepotism statute, article 5996a, V.T.C.S., prohibits the City of Childress from hiring an individual as a police officer if the individual's father-in-law is a member of the city council.
Date: September 11, 1989
Creator: Texas. Attorney-General's Office.
Object Type: Text
System: The Portal to Texas History
Growth kinetics for the precipitation of zirconium hydroxide from aqueous zirconium and tin bearing solutions by the addition of ammonium hydroxide (open access)

Growth kinetics for the precipitation of zirconium hydroxide from aqueous zirconium and tin bearing solutions by the addition of ammonium hydroxide

The precipitation of zirconium hydroxide from an aqueous solution of ammonium hexafluorozirconate occurs rapidly upon addition of ammonium hydroxide. Experimental data indicate growth and nucleation rates between 0.06 and 0.28 microns/minute and around 10 {times} 107 number/L-min, respectively. Experiments with a mixed suspension mixed product removal crystallizer for concentrations of reactants of about 0.05 M ammonium hexafluorozirconate precipitating with 0.002 M ammonium hydroxide showed apparent nonlinear growth rates in some cases but not others. Batch studies indicated that growth rate dispersion is probably not present. When the AFL nonlinear model was used to fit the data, the power coefficient obtained was greater than 1, in disagreement with theory. In addition, for some of the data ``S`` shaped curves of the logarithm of the cumulative number greater than versus size were obtained. These curves can not be fit by the AFL model. A program developed at the University of Arizona was used to simulate the crystallization runs. The program results indicated that some of the nonlinear behavior may be attributed to transient conditions. Experimental data also illustrated this behavior. The effect of trace amounts of tin fluoride (0.008 M) on the nucleation and growth kinetics was also evaluated. For some residence …
Date: September 11, 1989
Creator: Carleson, T. E. & Chipman, N. A.
Object Type: Article
System: The UNT Digital Library
Design wind speeds for high hazard, moderate hazard, important/low hazard and general use facilities at the Savannah River Site (open access)

Design wind speeds for high hazard, moderate hazard, important/low hazard and general use facilities at the Savannah River Site

The design wind speeds for High Hazard, Moderate Hazard, Important/Low Hazard and General Use facilities at the Savannah River Site are developed below using the procedures and site-specific hazards model required by DOE Order 6430.1A. These are less than the previously required Design Wind Speeds and are: (1) High Hazard (Maximum Resistance) Facility, 185 mph; (2) Moderate Hazard (High Resistance) Facility, 37 mph; (3) Important/Low Hazard (Intermediate) Facility, 83 mph; and, (4) General Use (Standard) Facility, 78 mph.
Date: September 11, 1989
Creator: King, H. H.
Object Type: Report
System: The UNT Digital Library
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 108, No. 19, Ed. 1 Monday, September 11, 1989 (open access)

Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 108, No. 19, Ed. 1 Monday, September 11, 1989

Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.
Date: September 11, 1989
Creator: McGee, Leigh
Object Type: Newspaper
System: The Portal to Texas History
The Bastrop Advertiser (Bastrop, Tex.), Vol. 136, No. 56, Ed. 1 Monday, September 11, 1989 (open access)

The Bastrop Advertiser (Bastrop, Tex.), Vol. 136, No. 56, Ed. 1 Monday, September 11, 1989

Semi-weekly newspaper from Bastrop, Texas that includes local, state, and national news along with extensive advertising.
Date: September 11, 1989
Creator: McAuley, Davis
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 67, No. 270, Ed. 1 Monday, September 11, 1989 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 67, No. 270, Ed. 1 Monday, September 11, 1989

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: September 11, 1989
Creator: Brown, Leon
Object Type: Newspaper
System: The Portal to Texas History
[Letter from Vicki J. Rosenberg to JoAnn Canales, September 11, 1989] (open access)

[Letter from Vicki J. Rosenberg to JoAnn Canales, September 11, 1989]

Photocopy of a letter from Vicki J. Rosenberg to JoAnn Canales explaining what all to expect at an upcoming meetings she will be attending after accepting responsibility for the evaluation of the North Texas Regional Institute for Educators on the Visual Arts. Rosenberg provides details on date, time and location for the meeting as well as important contact information.
Date: September 11, 1989
Creator: Rosenberg, Vicki J.
Object Type: Letter
System: The UNT Digital Library
[RE: Airline Reservations for Assessment Meeting, Nov. 4-7] (open access)

[RE: Airline Reservations for Assessment Meeting, Nov. 4-7]

A memo from Vicki Rosenberg, program officer for the Getty Center for Education in the Arts, to the Regional Institute Directors. The memo is in regards to travel to the November meeting from November 4 -8, 1989 and as such the directors should plan on leaving the morning of November 8.
Date: September 11, 1989
Creator: Rosenberg, Vicki
Object Type: Letter
System: The UNT Digital Library
Hilltop Views (Austin, Tex.), Vol. 4, No. 1, Ed. 1 Monday, September 11, 1989 (open access)

Hilltop Views (Austin, Tex.), Vol. 4, No. 1, Ed. 1 Monday, September 11, 1989

Biweekly student newspaper from St. Edward's University in Austin, Texas that includes news and information of interest to the college community along with advertising.
Date: September 11, 1989
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 75, No. 310, Ed. 1 Monday, September 11, 1989 (open access)

Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 75, No. 310, Ed. 1 Monday, September 11, 1989

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date: September 11, 1989
Creator: Lake, Charles S.
Object Type: Newspaper
System: The Gateway to Oklahoma History
Burleson Star (Burleson, Tex.), Vol. 24, No. 103, Ed. 1 Monday, September 11, 1989 (open access)

Burleson Star (Burleson, Tex.), Vol. 24, No. 103, Ed. 1 Monday, September 11, 1989

Tri-weekly newspaper from Burleson, Texas that includes local, state, and national news along with advertising.
Date: September 11, 1989
Creator: Moody, James
Object Type: Newspaper
System: The Portal to Texas History