Final Report  Subcontract B623760
Abstract
During my visit to LLNL during July 17{27, 2017, I worked on linear system solvers. The two level hierarchical solver that initiated our study was developed to solve linear systems arising from hp adaptive finite element calculations, and is implemented in the PLTMG software package, version 12. This preconditioner typically requires 320% of the space used by the stiffness matrix for higher order elements. It has multigrid like convergence rates for a wide variety of PDEs (selfadjoint positive de nite elliptic equations, convection dominated convectiondiffusion equations, and highly indefinite Helmholtz equations, among others). The convergence rate is not independent of the polynomial degree p as p ! 1, but but remains strong for p 9, which is the highest polynomial degree allowed in PLTMG, due to limitations of the numerical quadrature rules implemented in the software package. A more complete description of the method and some numerical experiments illustrating its effectiveness appear in. Like traditional geometric multilevel methods, this scheme relies on knowledge of the underlying finite element space in order to construct the smoother and the coarse grid correction.
 Authors:
 Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
 Publication Date:
 Research Org.:
 Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1410786
 Report Number(s):
 LLNLSR742143
 DOE Contract Number:
 AC5207NA27344
 Resource Type:
 Technical Report
 Country of Publication:
 United States
 Language:
 English
 Subject:
 97 MATHEMATICS AND COMPUTING
Citation Formats
Bank, R. Final Report  Subcontract B623760. United States: N. p., 2017.
Web. doi:10.2172/1410786.
Bank, R. Final Report  Subcontract B623760. United States. doi:10.2172/1410786.
Bank, R. 2017.
"Final Report  Subcontract B623760". United States.
doi:10.2172/1410786. https://www.osti.gov/servlets/purl/1410786.
@article{osti_1410786,
title = {Final Report  Subcontract B623760},
author = {Bank, R.},
abstractNote = {During my visit to LLNL during July 17{27, 2017, I worked on linear system solvers. The two level hierarchical solver that initiated our study was developed to solve linear systems arising from hp adaptive finite element calculations, and is implemented in the PLTMG software package, version 12. This preconditioner typically requires 320% of the space used by the stiffness matrix for higher order elements. It has multigrid like convergence rates for a wide variety of PDEs (selfadjoint positive de nite elliptic equations, convection dominated convectiondiffusion equations, and highly indefinite Helmholtz equations, among others). The convergence rate is not independent of the polynomial degree p as p ! 1, but but remains strong for p 9, which is the highest polynomial degree allowed in PLTMG, due to limitations of the numerical quadrature rules implemented in the software package. A more complete description of the method and some numerical experiments illustrating its effectiveness appear in. Like traditional geometric multilevel methods, this scheme relies on knowledge of the underlying finite element space in order to construct the smoother and the coarse grid correction.},
doi = {10.2172/1410786},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =
}

The Fuller Company conducted tests to determine the feasibility of conveying KerrMcGee ash concentrate (KMAC) by two different methods: a FullerKinyon pump conveying system and a blowtank pneumatic transport system. The FullerKinyon tests showed that a 1500ft/min conveying velocity satisfied a wide range of KMAC flow conditions. No conveying problems occurred in either system at temperatures below 550/sup 0/F at this velocity. Also, no appreciable KMAC attrition was noted. Thus, technically, either system can convey KMAC satisfactorily. Additional studies conducted independently by GKT to compare the economics and onstream reliability of both methods showed that the FullerKinyon pump is moremore »

Subcontract Report: Final Report on Assessment of Motor Technologies for Traction Drives of Hybrid and Electric Vehicles (Subcontract #4000080341)
Currently, interior permanent magnet (IPM) motors with rareearth (RE) magnets are almost universally used for hybrid and electric vehicles (EVs) because of their superior properties, particularly power density. However, there is now a distinct possibility of limited supply or very high cost of RE magnets that could make IPM motors unavailable or too expensive. Because development of electric motors is a critical part of the U.S. Department of Energy (DOE) Advanced Power Electronics and Motors activity, DOE needs to determine which options should be investigated and what barriers should be addressed. Therefore, in order to provide a basis for decidingmore » 
Remedial action plan and site design for stabilization of the inactive Uranium Mill Tailings Site at Lowman, Idaho: Attachment 1, Specifications and design drawings, LOW; Subcontract Documents: Bid schedule, special conditions, specifications, subcontract drawings. Final design for construction, Appendix B of the Cooperative Agreement
This volume contains subcontract documents which include: bidding requirements; terms and conditions; specifications; and subcontract drawings. 
HighEfficiency ThinFilm Cadmium Telluride Photovoltaic Cells; Final Subcontract Report, Final Technical Report, 21 January 199431 March 1998
This report describes work performed during the past year by The University of Toledo photovoltaics group. Researchers continued to develop rf sputtering for CdS/CdTe thinfilm solar cells and to optimize the postdeposition process steps to match the characteristics of the sputtering process. During the fourth phase of the present contract, we focused on determining factors that limit the efficiency in our ''allsputtered'' thinfilm CdTe solar cells on sodalime glass. These issues include controlling CdS/CdTe interdiffusion, understanding the properties of the CdS{sub x}Te{sub 1x} alloy, optimizing process conditions for CdCl{sub 2} treatments, manipulating the influence of ion bombardment during rf sputtering,more » 
Final report for NIF chamber dynamics studies, final rept (May 1997), Subcontract No. B291847
The National Ignition Facility (NIF), a 1.8 MJ, 192 laser beam facility, will have anticipated fusion yields of up to 20 MJ from DT pellets encased in a gold hohlraum target. The energy emitted from the target in the form of x rays, neutrons, target debris kinetic energy, and target shrapnel will be contained in a 5 m. radius spherical target chamber. Various diagnostics will be stationed around the target at varying distances from the target. During each shot, the target will emit x rays that will vaporize nearby target facing surfaces including those of the diagnostics, the target positioner,more »