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AMG/FOSLS for LLNL Applications
The work included improving parallel scalability of the multilevel software package ML, and concentrated on improving robustness and convergence properties of the Smoothed Aggregation Multilevel Iterative Solver (SAMISdat(AMG)) for solution of second order problems. Although both scalar and nonscalar problems were targeted, the emphasis was on treatment of nonscalar problems of thin body elasticity such as encountered with ALE3D.
Date:
September 23, 2001
Creator:
Brezina, Marian & Jones, Jim E.
Object Type:
Report
System:
The UNT Digital Library
Magnetic properties of fluorinated Pb-doped Hg-1223 high Tc superconductors
Fluorination of Pb-doped HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (Hg-1223) system was investigated. Structural and magnetic measurements reveal that fluorine addition promotes the phase formation, optimize the charge carrier concentration, and enhance flux pinning. We report an increase in both the transition temperature and the critical current density through controlled fluorine incorporation. Even a possible change in the pinning mechanism in this technologically important system is suggested.
Date:
September 23, 2001
Creator:
Hamdan, N.M.; Sastry, P.V.P.S.S. & Schwartz, J.
Object Type:
Article
System:
The UNT Digital Library