Oak Ridge National Laboratory


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Media Contact: Media Relations (news@ornl.gov)
Communications and External Relations


Nachtigal honored for co-authoring paper

OAK RIDGE, Tenn., Oct. 28, 1995 — Noel Nachtigal of the Department of Energy's Oak Ridge National Laboratory (ORNL) has been honored by the Society for Industrial and Applied Mathematics for co-authoring a paper designated as one of the two most outstanding papers published on linear algebra between 1991 and 1993. Nachtigal, a research staff member with ORNL's mathematical sciences section and an adjunct assistant professor at the University of Tennessee, was honored at the society's fifth conference on applied linear algebra, conducted in Snowbird, Utah. Also recognized was co-author Roland Freund of AT&T Bell Laboratories.

Their paper, entitled "QMR: A Quasi-Minimal Residual Method for Non-Hermitian Linear Systems," introduced a new method that can be applied to solve large, sparse, nonsymmetric linear systems. The method has been successfully used to solve problems arising in circuit simulation, computational fluid dynamics, electromagnetism and materials science.

A native of Romania, Nachtigal joined ORNL's Engineering Physics and Mathematics Division as a Householder Fellow in September 1993.

He received a bachelor's degree in mathematics and physics from the University of South Carolina and a doctoral degree in applied mathematics from the Massachusetts Institute of Technology.

The Oak Ridge National Laboratory, one of the Department of Energy's multiprogram national research and development facilities, is managed by Martin Marietta Energy Systems Inc., which also manages the Oak Ridge K-25 Site and the Oak Ridge Y-12 Plant.