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354 Matching Results

Start Over Year 1997 Day 27th

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(open access)

Scalable libraries for solving systems of nonlinear equations and unconstrained minimization problems.

Developing portable and scalable software for the solution of large-scale optimization problems presents many challenges that traditional libraries do not adequately meet. Using object-oriented design in conjunction with other innovative techniques, they address these issues within the SNES (Scalable Nonlinear Equation Solvers) and SUMS (Scalable Unconstrained Minimization Solvers) packages, which are part of the multilevel PETSCs (Portable, Extensible Tools for Scientific computation) library. This paper focuses on the authors design philosophy and its benefits in providing a uniform and versatile framework for developing optimization software and solving large-scale nonlinear problems. They also consider a three-dimensional anisotropic Ginzburg-Landau model as a representative application that exploits the packages' flexible interface with user-specified data structures and customized routines for function evaluation and preconditioning.

Date: October 27, 1997

Creator: Gropp, W. D.; McInnes, L. C. & Smith, B. F.

Object Type: Article

System: The UNT Digital Library

(open access)

Improved risk estimated from carbon tetrachloride. Annual progress report, October 1, 1996--September 30, 1997

'Carbon tetrachloride (CCl{sub 4}) has been used extensively within the Department of Energy (DOE) nuclear weapons facilities. Rocky Flats was formerly the largest volume user of CCl{sub 4} in the US, with 5,000 gallons used there in 1977 alone. At the Hanford site, several hundred thousand gallons of CCl{sub 4} were discharged between 1955 and 1973 into underground cribs for storage. Levels of CCl{sub 4} in groundwater at highly contaminated sites at the Hanford. facility have exceeded the drinking water standard of 5 ppb by several orders of magnitude. High levels of CCl{sub 4} at these facilities represent a potential health hazard for workers conducting cleanup operations and for surrounding communities. The level of CCl{sub 4} cleanup required at these sites and associated costs are driven by current human health risk estimates which assume that CCl{sub 4} is a genotoxic carcinogen. The overall purpose of these studies is to improve the scientific basis for assessing the health risk associated with human exposure to CCl{sub 4}. Specifically, the authors will determine the toxicokinetics of inhaled and ingested CCl{sub 4} in F344/Crl rats, B6C3F1 mice, and Syrian hamsters. They will also evaluate species differences in the metabolism of CCl{sub 4} by rats, …

Date: October 27, 1997

Creator: Benson, J.M.

Object Type: Report

System: The UNT Digital Library

(open access)

TRU waste from the Superblock

This data analysis is to show that weapons grade plutonium is of uniform composition to the standards set by the Waste-Isolation Pilot Plant (WIPP) Transuranic Waste Characterization Quality Assurance Program Plan (TRUW Characterization QAPP, Rev. 2, DOE, Carlsbad Area Office, November 15, 1996). The major portion of Superblock transuranic (TRU) waste is glove-box trash contaminated with weapons grade plutonium. This waste originates in the Building 332 (B332) radioactive-materials area (RMA). Because each plutonium batch brought into the B332 RMA is well characterized with regard to nature and quantity of transuranic nuclides present, waste also will be well characterized without further analytical work, provided the batches are quite similar. A sample data set was created by examining the 41 incoming samples analyzed by Ken Raschke (using a {gamma}-ray spectrometer) for isotopic distribution and by Ted Midtaune (using a calorimeter) for mass of radionuclides. The 41 samples were from separate batches analyzed May 1993 through January 1997. All available weapons grade plutonium data in Midtaune's files were used. Alloys having greater than 50% transuranic material were included. The intention of this study is to use this sample data set to judge ''similarity.''

Date: May 27, 1997

Creator: Coburn, T. T.

Object Type: Report

System: The UNT Digital Library

[Photograph 2012.201.B1019.0443]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "In 1934, Frank Phillips sponsored famous flyer Wiley Post on a record flight into the stratosphere, the near border of space."

Date: April 27, 1997

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

[Photograph 2012.201.B1019.0400]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Here is Phillips' first service station on opening day November 19, 1927, Wichita, KS."

Date: April 27, 1997

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

(open access)

Design and development of a new hybrid spectroelectrochemical sensor. Annual technical progress report, September 15, 1996--September 14, 1997

'A new concept for a chemical sensor that demonstrates three modes of selectivity (electrochemistry, spectroscopy, and selective partitioning) is being developed. The spectroelectrochemical sensor consists of an optically transparent electrode (OTE) coated with a selective film. Sensing is based on the change in optical signal of light passing through the OTE that accompanies an electrochemical reaction of the analyte at the electrode surface. Thus, for an analyte to be detected, it must partition into the selective coating, be electrolyzed at the potential applied to the electrode, and either the analyte or its electrolysis product must absorb light at the wavelength chosen. Selectivity for the analyte relative to other solution components is obtained by choice of coating material, electrolysis potential, and wavelength for optical monitoring. The purpose of this new sensor is to significantly broaden the applicability of sensors to real samples by improving selectivity. This high level of selectivity is to be achieved without any fragile biocomponent. The concept is to be demonstrated with a sensor for ferrocyanide.'

Date: October 27, 1997

Creator: Heineman, W. R.; Seliskar, C. J. & Ridgway, T. H.

Object Type: Report

System: The UNT Digital Library

(open access)

Wake properties of a stripline beam kicker

The transport of a high current relativistic electron beam in a stripline beam kicker is strongly dependent on the wake properties of the structure. The effect of the beam-induced fields on the steering of the beam must be determined for a prescribed trajectory within the structure. A 3-D time domain electromagnetic code is used to determine the wake fields and the resultant Lorentz force on the beam both for an ultra-relativistic electron beam moving parallel to the beamline axis as well as a beam that follows a curved trajectory through the structure. Usually in determining the wake properties of the structure, a wake impedance is found for a beam that is moving parallel to the beamline axis. However, we extend this concept to curved trajectories by calculating beam induced forces along the curved trajectory. Comparisons are made with simple transmission line models of the structure. The wake properties are used in models to transport the beam self-consistently through the structure.

Date: May 27, 1997

Creator: Poole, B. R., LLNL

Object Type: Article

System: The UNT Digital Library

[Photograph 2012.201.B1221.0762]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Eddie Sutton"

Date: April 27, 1997

Creator: unknown

Object Type: Photograph

System: The Gateway to Oklahoma History

(open access)

Highly oxidized and metamorphosed chondritic or igneous (?) clasts in the CV3 carbonaceous chondrite mokoia: excavated material from the interior of the CV3 asteroid or previously unsampled asteroid

None

Date: January 27, 1997

Creator: Krot, A. N., Hawaii Institute of Geophysical and Planetogy

Object Type: Article

System: The UNT Digital Library

captions transcript

[News Clip: Routier]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas to accompany a news story. This story aired at 6 P.M.

Date: January 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Robbery shooting VO]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas to accompany a news story. This story aired at 12 P.M.

Date: February 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Baby Sam hearing VO]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas to accompany a news story. This story aired at 5 P.M.

Date: February 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Simpson]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 12 P.M.

Date: January 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Rep of TX pkg]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas to accompany a news story. This story aired at 10 P.M.

Date: January 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Routier pkg]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas to accompany a news story. This story aired at 10 P.M.

Date: January 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Baby FOLO]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 5pm.

Date: January 27, 1997, 5:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Serial robberies]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: February 27, 1997

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

(open access)

UNT to work with six Metroplex elementary schools in national arts experiment designed to boost achievement

An information release document in regards to six metroplex elementary schools plus thirty other schools nationwide were selected to participate as Arts Partner Schools in a $15 million experiment to reform education. The six schools will work with art educators at the University of North Texas, announced this month by the Annenberg Foundation, the Getty Education Institute for the Arts and the National Arts Education Consortium.

Date: March 27, 1997

Creator: LeMay, Nancy C.

Object Type: Article

System: The UNT Digital Library