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Analysis of compression behavior of a [011] Ta single crystal with orientation imaging microscopy and crystal plasticity
High-purity tantalum single crystal cylinders oriented with [011] parallel to the cylinder axis were deformed 10, 20, and 30 percent in compression. The engineering stress-strain curve exhibited an up-turn at strains greater than {approximately}20% while the samples took on an ellipsoidal shape during testing, elongated along the [100] direction with almost no dimensional change along [0{bar 1}1]. Two orthogonal planes were selected for characterization using Orientation Imaging Microscopy (OIM): one plane containing [100] and [011] (longitudinal) and the other in the plane containing [0{bar 1}1] and [011] (transverse). OIM revealed patterns of alternating crystal rotations that develop as a function of strain and exhibit evolving length scales. The spacing and magnitude of these alternating misorientations increases in number density and decreases in spacing with increasing strain. Classical crystal plasticity calculations were performed to simulate the effects of compression deformation with and without the presence of friction. The calculated stress-strain response, local lattice reorientations, and specimen shape are compared with experiment.
Date:
February 3, 1999
Creator:
Adams, B. L.; Campbell, G. H.; King, W. E.; Lassila, D. H.; Stolken, J. S.; Sun, S. et al.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 97, Ed. 1 Wednesday, February 3, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 3, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Light and heavy element isotopic compositions of mainstream SiC grains.
Although a variety of types of pre-solar SiC grains have been classified by their C, N, and Si isotopic composition, the majority of such grains are so-called mainstream grains and are believed to have come from asymptotic giant branch stars [1]. We have previously reported the Mo isotopic compositions of presolar SiC grains whose C, N, and Si isotopic compositions were not known [2]. Since most presolar SiC grains fall in the mainstream group, we assumed that these grains were mainstream. The excellent match of the Mo isotopic data with expectations for nucleosynthesis in AGB stars was consistent with this identification. In order to better understand the distribution of isotopic compositions in presolar grains, we have begun to measure heavy element isotopic compositions of presolar SiC grains of known C, N and Si isotopic composition.
Date:
February 3, 1999
Creator:
Amari, S.; Clayton, R. N.; Davis, A. M.; Lewis, R. S. & Pellin, M. J.
Object Type:
Article
System:
The UNT Digital Library
Molybdenum isotopic composition of single silicon carbides from supernovae.
Presolar silicon carbide grains form in a variety of types of stars, including asymptotic giant branch red giant stars and supernovae. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur in AGB stars and supernovae, respectively. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo. We report here the first measurements of Mo isotopes in X-type SiC grains, which have previously been identified as having formed from supernova ejecta.
Date:
February 3, 1999
Creator:
Amari, S.; Clayton, R. N.; Davis, A. M.; Lewis, R. S. & Pellin, M. J.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0398.0313]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Matt Moffatt, 19, of Moore, recently emerged as the fifth most lethal video viper in the United States. He battled with a select group of 57 college-age Nintendo ninjas to claim fifth place in the National Nintendo Campus Challenge Finals in Orlando, Fla."
Date:
February 3, 1992
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0999.0428]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
February 3, 1994
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0999.0429]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jean Pantlik with her students in the classroom."
Date:
February 3, 1994
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1076.0607]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Guymon High School sophomore Carrie Miles has been named winner of the Parade Magazine Young Columbus award by The Oklahoman."
Date:
February 3, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1175.0277]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "John Silber is back at the helm of Boston University after losing a long hard fought campaign to be governor of Massachusetts, and he shows no signs of wear."
Date:
February 3, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1217.0121]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Sandy Stratton developing Route 66 Museum at Clinton for the Oklahoma Historical Society."
Date:
February 3, 1994
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1321.0024]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "the University of Central Oklahoma's Old North Tower is one of the Edmond sites feature in the "Oklahoma Historical Tour Guide."
Date:
February 3, 1992
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1432.0295]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
February 3, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1432.0297]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Lance Cpl. Anthony Botello's comrades in arms carry his casket from the Wilburton high School auditorium after his funeral Wednesday."
Date:
February 3, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1432.0298]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Sharla Botello, wife of slain Marine Lance Cpl. Anthony David Botello, wipes away tears while leaving the funeral Wednesday accompanied by her mother, Ann Gean, and stepfather Larry Gean."
Date:
February 3, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[E-mail from Rodger Ballentine to Melinda Mayer, February 3, 1999]
An e-mail from Rodger Ballentine to Melinda Mayer about following up from a previous retreat.
Date:
February 3, 1999
Creator:
Ballentine, Rodger D.
Object Type:
Letter
System:
The UNT Digital Library
University Press (Beaumont, Tex.), Vol. 70, No. 5, Ed. 1 Wednesday, February 3, 1993
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
February 3, 1993
Creator:
Bankston, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
Energy transfer properties and mechanisms. Technical progress report
Collisional energy transfer is the controlling factor in many nonequilibrium chemical systems: combustion, laser-induced chemical reactions, shock-heated gases, atmospheric chemistry, etc. During this period, efforts were made in 3 areas: large molecule energy transfer experiments (organic compounds); triatomic V-T/R energy transfer (memory effects); and energy transfer in extreme environments (shock tube data on norbornene). Results are described very briefly.
Date:
February 3, 1995
Creator:
Barker, J. R.
Object Type:
Report
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 35, No. 5, Ed. 1 Thursday, February 3, 1994
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 3, 1994
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
ARAC dispersion modeling of the July 26, 1993 oleum tank car spill in Richmond, California
This report presents the results from the real-time response on the day of the spill followed by a re-assessment of the spill. Worst-case source terms and readily available meteorological data (met data) were used for the real-time response. ARAC employs a three-dimensional, diagnostic, finite-difference dispersion modeling system for estimating the consequences from accidental atmospheric releases. MATHEW (Mass-Adjusted Three- Dimensional Wind field), a Eulerian wind field code, and ADPIC (Atmospheric Diffusion by Particle-In-Cell), a hybrid Eulerian-Lagrangian dispersion model, from the core of the system. For a particular incident a model grid is selected to encompass the area of concern and is generated using underlying terrain from on-line data. Meteorological data from multiple surface and upper air stations are automatically acquired in real time primarily from local airports and formatted to initialize the wind field model. Dispersion parameters are determined from meteorological data and the source term from available information. The system is designed to simulate releases from single or multiple radioactive releases, such as ventings, spills, fires, or explosions. Solid and liquid aerosols and neutrally-buoyant gases are modeled. Particle size distributions are input for each aerosol source and modeled using gravitational settling and wet and dry deposition, if applicable. The system …
Date:
February 3, 1994
Creator:
Baskett, R. L.; Vogt, P. J.; Schalk, W. W., III & Pobanz, B. M.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0152.0667]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Guy and Julie Bramble and Bushra and Dr. Sam Dahr, from left, help themselves to food from the buffet."
Date:
February 3, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0334.0537]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jim and Cathy Kirk and Linda and Joe Mideke, from left, arrive for the Monte Carlo party."
Date:
February 3, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0931.0823]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Willard Johnson as Toulouse-Lautrec, Donna Nichols, center, and Robin Decker."
Date:
February 3, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1022.0381]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OSU's Johnny Pittman, right, back in on Iowa State's Phil Kunz during first-half action Saturday at Gallagher-Iba Arena."
Date:
February 3, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1022.0382]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "OSU's Johnny Pittman, right, back in on Iowa State's Phil Kuntz during first-half action."
Date:
February 3, 1990
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History