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Theory of high-T{sub c} cuprates based on experimental evidence.
A model of superconductivity in layered high-temperature superconducting cuprates is proposed, based on the extended saddle point singularities in the electron spectrum, weak screening of the Coulomb interaction and phonon-mediated interaction between electrons plus a small short-range repulsion of Hund's, or spin-fluctuation, origin. This permits to explain the large values of T{sub c}, features of the isotope effect on oxygen and copper, the existence of two types of the order parameter, the peak in the inelastic neutron scattering, the positive curvature of the upper critical field, as function of temperature etc.
Date:
August 17, 1999
Creator:
Abrikosov, A. A.
Object Type:
Article
System:
The UNT Digital Library
PdMn and PdFe: New Materials for Temperature Measurement Near 2K
Interest in the critical dynamics of superfluid <SUP>4</SUP> He in microgravity conditions has motivated the development of new high resolution thermometry technol- ogy for use in space experiments near 2K. The current material commonly used as the temperature sensing element for high resolution thermometers (HRTs) is copper ammonium bromide [Cu(NH<SUB>4</SUB>)<SUB>2</SUB>Br<SUB>4</SUB>2H<SUB>2</SUB>0) or "CAB", which undergoes a ferromagnetic phase transition at 1.8K1. HRTs made from CAB have demonstrated low drift (< 10fK/s) and a temperature resolu- tion of O.lnK. Unfortunately, paramagnetic salts such as CAB are difficult to prepare and handle, corrosive to most metals, and become dehydrated if kept, under vacuum conditions at room temperature. We have developed a magnetic thermometer using dilute magnetic alloys of Mn or Fe dissolved in a pure Pd matrix. These metallic thermometers are easy to fabricate, chemically inert, and mechanically robust. Unlike salts, they may be directly soldered to the stage to be measured. Also, the Curie temperature can be varied by changing the concentration of Fe or Mn, making them available for use in a wide temperature range. Susceptibility measurements, as well as preliminary noise and drifl measurements, show them, to have sub-nK resolution, with a drift of less than 10<SUP>-13</SUP> K/s.
Date:
May 17, 1999
Creator:
Adriaans, M. J.; Aselage, T. L.; Day, P. K.; Duncan, R. V.; Klemme, B. J. & Sergatskov, D. A.
Object Type:
Article
System:
The UNT Digital Library
Phase Behavior of Blends of Linear and Branched Polyethylenes on Micron-Length Scales via Ultra-Small-Angle Neutron Scattering (USANS)
SANS experiments on blends of linear, high density (HD) and long chain branched, low density (LD) polyethylenes indicate that these systems form a one-phase mixture in the melt. However, the maximum spatial resolution of pinhole cameras is approximately equal to 10<sup>3</sup>Å and it has therefore been suggested that data might also be interpreted as arising from a bi-phasic melt with large a particle size (~ 1 µm), because most of the scattering from the different phases would not be resolved. We have addressed this hypothesis by means of USANS experiments, which confirm that HDPEILDPE blends are homogenous in the melt on length scales up to 20 µm. We have also studied blends of HDPE and short-chain branched linear low density polyethylenes (LLDPEs), which phase separate when the branch content is sufficiently high. LLDPEs prepared with Ziegler-Natta catalysts exhibit a wide distribution of compositions, and may therefore be thought of as a �blend� of different species. When the composition distribution is broad enough, a fraction of highly branched chains may phase separate on µm-length scales, and USANS has also been used to quantify this phenomenon.
Date:
May 17, 1999
Creator:
Agamalian, M. M.; Alamo, R. G.; Londono, J. D.; Mandelkern, L. & Wignall, G. D.
Object Type:
Article
System:
The UNT Digital Library
Phase Behavior of Blends of Linear and Branched Polyethylenes via Small- and Ultra-Small Angle Neutron Scattering
None
Date:
May 17, 1999
Creator:
Agamalian, M. M.; Alamo, R. G.; Londono, J. D.; Mandelkern, L.; Stehling, F. C. & Wignall, G. D.
Object Type:
Article
System:
The UNT Digital Library
Eligibility of Indoor Plumbing Under Alaska Sanitation Infrastructure Grant Program
This is a memorandum to answer questions in regards to the Village Safe Water (VSW) Program,
Date:
June 17, 1999
Creator:
Albright, Richard
Object Type:
Text
System:
The UNT Digital Library
Oral History Interview with Richard L. Johnston, February 17, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with William J. Alexander, a Army WWII veteran from Universal, Pennsylvania, who served as an officer of the 382nd Engineer Battalion (Separate), a unit of black enlisted troops. Alexander discusses growing up, joining the Civilian Conservation Corps, joining the Army and commissioning through OCS, training, deployment to India, building the Ledo Road, General Joseph Stilwell, constructing the 20th Bomber Command HQ, working in a steelmill, the atomic bomb, returning home, and postwar service.
Date:
February 17, 1999
Creator:
Alexander, William J. & Johnston, Richard L.
Object Type:
Book
System:
The UNT Digital Library
Oral History Interview with William J. Lesko, February 17, 1999
Access:
Use of this item is restricted to the UNT Community
Interview with William J. Lesko, a Army Air Corps WWII veteran from New Kensington, Pennsylvania, who served with the 14th Combat Cargo Group in the China-Burma-India Theater. Lesko discusses his family background, enlisting and training to be a radar and radio technician, deployment to India, flying supplies to British troops in Burma, the end of the war, returning to the United States, and life postwar.
Date:
February 17, 1999
Creator:
Alexander, William J. & Lesko, William J.
Object Type:
Book
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 107, Ed. 1 Wednesday, February 17, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 17, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Surficial bioturbation and rapid benthic remineralization in the Cape Hatteras shelf/slope region. Final report
This is a final report for the DOE of grant DE-FG02-92ER61464 ''Surficial bioturbation and rapid benthic remineralization in the Cape Hatteras shelf slope region''. Over the past 6 years we have participated in a multidisciplinary field study called the Ocean margins Program (OMP) to examine the importance of continental margins in the global carbon cycle. Specifically, we have focused on the southern portion of the Mid-Atlantic Bight between Cape Hatteras and Chesapeake Bay where a large flux of freshwater and organic carbon enters the North Atlantic Ocean. Additionally, during the first stage of this project, we developed the use of CM-a distributions in sediments as a quantitative indicator of benthic C flux and remineralization rates. The primary objective of our research group has been to understand mechanisms and quantify biogeochemical processes in the seabed that affect cycling, flux, and storage of carbon on the ocean margin of the Mid-Atlantic Bight.
Date:
March 17, 1999
Creator:
Aller, Robert C.; Aller, Josephine Y.; Lee, C. & Cochran, J. Kirk
Object Type:
Report
System:
The UNT Digital Library
First World War Statue
Photograph of the First World War Doughboy statue in front of the Henryetta Public Library.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
First World War Statue
Photograph of the First World War Doughboy statue in front of the Henryetta Public Library.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
First World War Statue
Photograph of the plaque on the First World War Doughboy statue in front of the Henryetta Public Library.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
First World War Statue
Photograph of the First World War Doughboy statue in front of the Henryetta Public Library.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
First World War Statue
Photograph of the First World War Doughboy statue in front of the Henryetta Public Library.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Frisco Depot
Photograph of the Bristow Frisco Depot.
Date:
August 17, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History