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Analysis of oxygen on and in beryllium using 2 MeV helium ions
Analysis of oxygen on beryllium can be routinely performed using helium-ion backscattering (RBS). However, determination of the bulk oxygen concentration by this technique is limited to about 350 atomic parts per million (appM). We have performed simultaneous RBS and particle-induced x-ray emission (PIXE) measurements to improve the detection limit for bulk oxygen. The RBS measurements allowed determination of the surface oxygen before and after in-situ sputter cleaning by argon ions in an ultra-high-vacuum system. PIXE measurements of specimens with surfaces maintained clean by sputtering permitted assessment of the concentration of oxygen in the bulk. For our geometry and detector sensitivities, 90% of the oxygen x-ray signal originated in the first 2.1 ..mu..m of the beryllium and a detection limit of 10 appM was found. 12 refs., 3 figs.
Date:
October 2, 1986
Creator:
Musket, R.G.
Object Type:
Article
System:
The UNT Digital Library
Thermal Regimes of Major Volcanic Centers: Magnetotelluric Constraints
The interpretation of geophysical/electromagnetic field data has been used to study dynamical processes in the crust beneath three of the major tectono-volcanic features in North America: the Long Valley/Mono Craters Volcanic Complex in eastern California, the Cascades Volcanic Belt in Oregon, and the Rio Grande Rift in the area of Socorro, New Mexico. Primary accomplishments have been in the area of creating and implementing a variety of 2-D generalized inverse computer codes, and the application of these codes to fields studies on the basin structures and he deep thermal regimes of the above areas. In order to more fully explore the space of allowable models (i.e. those inverse solutions that fit the data equally well), several distinctly different approaches to the 2-D inverse problem have been developed: (1) an overdetermined block inversion; (2) an overdetermined spline inverstion; (3) a generalized underdetermined total inverse which allows one to tradeoff certain attributes of their model, such as minimum structure (flat models), roughness (smooth models), or length (small models). Moreover, we are exploring various approaches for evaluating the resolution model parameters for the above algorithms. 33 refs.
Date:
October 2, 1989
Creator:
Hermance, J. F.
Object Type:
Report
System:
The UNT Digital Library
Academy awaits board completion, first meeting
Newspaper clipping of an article by Jay Johnson, noting that the TAMS advisory board is more than half complete, and that Dr. Rogers Redding hopes to have it filled and meeting within a few weeks.
Date:
October 2, 1987
Creator:
Johnson, Jay
Object Type:
Clipping
System:
The UNT Digital Library
[Photograph 2012.201.B0143.0009]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Brandy and Chip Cooley get ready for some chili and a football game afterward."
Date:
October 2, 1981
Creator:
Lynn, Renee
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0164.0348]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Dingie, an Australian Blue Heeler owned by Mike Peters, demonstrates his jumping ability during a frisbee-catching contest at Norman Andrews Park."
Date:
October 2, 1982
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0142.0382]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City Manager Jim Cook and his wife Martha Cook, enjoy the pre-dinner festivities"
Date:
October 2, 1980
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0135.0188]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "In the photo above, in which an old cooling tower stands in a shallow pond of water surrounded by tall grass on the roof of the hall."
Date:
October 2, 1985
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0146.0699]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Warden Jack Cowley, who says his prison at Taft may be one of the 'toughest' in the state, takes time to chat, above, with two inmates near the institution's fence."
Date:
October 2, 1984
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0335.0237]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Looking over a painting are, form left, John Kirkpatrick, Linda Nelson, Chuck Nelson and Eleanor Kirkpatrick."
Date:
October 2, 1984
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Review of the state of the art in personnel neutron monitoring with solid state detectors
Albedo systems are the mainstay at many facilities and continue to be refined. Advanced electrochemical etching techniques for CR-39 now yield a dose equivalent response that is nearly constant from 0.1 to 4.0 MeV. Recent studies include use of converters to enhance CR-39 response at both low and high energies. Methods have been suggested for use of CR-39, either alone or in conjunction with albedo and other detectors to provide spectral information as a step to more accurate dosimetry. Limitations in the use of CR-39 primarily center on the lack of consistent, high-quality, dosimetry-grade material, significant angular dependence, and poor dose equivalent response at both low and high energies. Work continues on silicon diodes, with some new designs. The most attractive new dosimetry technique is the bubble-damage or superheated drop detector. Metal-on-silicon (MOS) microelectronics present exciting possibilities for the future. 25 refs., 6 figs.
Date:
October 2, 1987
Creator:
Griffith, R.V.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0354.0636]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Robert E. Lee, left, senior metro editor at The Oklahoman, receives a national Founder's Award from Toney Lackey, president of a state chapter of the National Association of Civilian Conservation Corps Alumni."
Date:
October 2, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0269.0147]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edmond Cimarron football coach Darren Huff offers some words on instruction for Jay Biddy during Cimarron's clash with Norman Whittier Thursday afternoon."
Date:
October 2, 1986
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0350.0548]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "This hone at 419 NW 14 started out as a two-story frame structure."
Date:
October 2, 1984
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0245.0792]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "McGuiness running back Mike Hallmark prepares to try and run over Seminole's Brandon Moyer Friday night."
Date:
October 2, 1987
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0245.0380]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Dennie Hall"
Date:
October 2, 1980
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0254.0236]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Health Dept., State"
Date:
October 2, 1985
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0227.0587]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Velekka Gray as Ruby Collins (left) and Dr. Sharon Reaves in "The Young and the Restless "...."
Date:
October 2, 1983
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0260B.0011]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Ark Day-Care Center Open - Fannie Valencia, left, and her 3-year-old son, Valencia Theodore III, color a picture under the watchful eye of Mary Beth Hoffman, parent-child coordinator for the The Ark's new day care center. The center opened Oct. 3 at the Oklahoma City shelter for homeless families."
Date:
October 2, 1989
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0260B.0128]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "At right, Baker helps Trisha Hoffman, 3, walk along the balance beam."
Date:
October 2, 1981
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0249.0647]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Enjoying hors d'oeuvres are, from left, Helen Cleary, William Cleary, Jane Harlow and Jim Harlow."
Date:
October 2, 1982
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0305B.036]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kevin Jones"
Date:
October 2, 1981
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0264.0396]
Caption: "Mary Lou Horvath, left, Bue Cooper and Mary Tracy arrange goodies for the festival and bazaar at Christ the King Catholic Church Parish Family Center, 1900 Elmhurst." Three women pick up cupcakes from a box.
Date:
October 2, 1982
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0350.0394]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Manuel Crux strums a guitar fro the listening pleasure of Jerry Miles, Gina Lamb, Alan Lamb and Mandy Miles, from left, during a recent party of the Geologists Wives Association in the Lamb home."
Date:
October 2, 1987
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0174.0014]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Edmond Racquet Club has remodeled its three indoor tennis courts."
Date:
October 2, 1984
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History