From surfer.EPM.ORNL.GOV!nacomb Sun Jul 28 14:05:39 0400 1991 Received: by pyxis; Sun Jul 28 14:05 EDT 1991 To: pyxis!ehg Received: by inet.att.com; Sun Jul 28 14:05 EDT 1991 Received: by surfer.EPM.ORNL.GOV (5.61/1.34) id AA02080; Sun, 28 Jul 91 14:05:39 -0400 Date: Sun, 28 Jul 91 14:05:39 -0400 From: nacomb@surfer.EPM.ORNL.GOV (NA-NET) Message-Id: <9107281805.AA02080@surfer.EPM.ORNL.GOV> Subject: NA Digest, V. 91, # 30 Apparently-To: ehg@research.att.com NA Digest Sunday, July 28, 1991 Volume 91 : Issue 30 Today's Editor: Cleve Moler Today's Topics: Wilkinson Prize to Petzold and to Tang Change of Address for Ahmed Sameh Restoration of Addresses for Loyce Adams and Randy LeVeque SVD for Banded Matrices Multigrid and CFD Need Access to a 64k processor CM2 e-MATH Available from AMS SIAM Conference on Applied Linear Algebra Course in Germany on Simulation Ada on Super-Computers Workshop Contents: SIAM J. Math. Anal. Submissions for NA Digest: Mail to na.digest@na-net.ornl.gov. Information about NA-NET: Mail to na.help@na-net.ornl.gov. ------------------------------------------------------- From: Sven Hammarling Date: Mon, 22 Jul 91 12:40 GMT Subject: Wilkinson Prize to Petzold and to Tang The Wilkinson Prize for Numerical Software is awarded in honour of the outstanding contributions of James Hardy Wilkinson to the field of numerical software. The award is presented to the entry that best addresses all phases of the preparation of high quality numerical software. The prize is sponsored by Argonne National Laboratory, The National Physical Laboratory and the Numerical Algorithms Group. It is a great pleasure to announce that the first Wilkinson Prize has been awarded to Linda Petzold for the DASSL package, which was judged to be a significant contribution to numerical software in general and to the solution of differential/algebraic equations in particular. The prize was presented to Linda by Heather Wilkinson at the ICIAM meeting in Washington. Many congratulations to Linda. The entry by Peter Tang, on software for the elementary functions in Ada, was also judged to be of outstanding merit and was given a "most honourable mention". The overall standard of the thirteen entries was extremely high and was a fitting tribute to Jim Wilkinson. Potential entrants for the second Wilkinson prize, to be awarded in three years time, should contact Jorge More' at ANL (more@mcs.anl.gov) or Brian Ford at NAG Ltd (brian@nag.co.uk) for further details. Sven Hammarling. ------------------------------ From: Ahmed Sameh Date: Mon, 22 Jul 91 08:36:42 CDT Subject: Change of Address for Ahmed Sameh Effective August 16 my new address is: Ahmed Sameh Department of Computer Science University of Minnesota 200 Union Street S.E. Minneapolis, MN 55455 Telephone: (612) 625-0726 FAX : (612) 625-0572 e-mail : sameh@cs.umn.edu ------------------------------ From: R. J. LeVeque Date: Fri, 26 Jul 1991 16:51:10 +0200 Subject: Restoration of Addresses for Loyce Adams and Randy LeVeque As of the early August, we will be back in Seattle. Our addresses there are: Loyce Adams Applied Mathematics, FS-20 University of Washington Seattle, WA 98195 adams@amath.washington.edu phone: (206) 543-5077 department: (206) 543-5493 fax: (206) 685-1440 Randall LeVeque OR Applied Mathematics, FS-20 Mathematics, GN-50 University of Washington University of Washington Seattle, WA 98195 Seattle, WA 98195 rjl@amath.washington.edu rjl@math.washington.edu phone: (206) 685-3037 phone: (206) 543-7898 department: (206) 543-5493 department: (206) 543-1150 fax: (206) 685-1440 fax: (206) 543-9285 ------------------------------ From: Kumbukage Pradeep Seneviratne Date: Thu, 25 Jul 91 17:33:14 -0400 Subject: SVD for Banded Matrices I need to find the singular value decomposition of some banded matrices. Since the matrices are very large I would like to know whether there are routines which computes the SVD of a matrix utilizing the fact that the particular matrix is banded. Please let me know. Thank you. Kumbukage Pradeep Seneviratne deepman@caen.engin.umich.edu ------------------------------ From: John Prentice Date: Tue, 23 Jul 91 12:47:16 MDT Subject: Multigrid and CFD I am formulating a proposal to model a chemical vapor deposition reactor. This requires solving the Navier-Stokes equations with heat conduction, real gas equations of state, and reactive chemistry in three dimensions on an irregular grid. The goal of the work is to develop methods for modeling these reactors which are computationally less expensive than current methods (conventional finite difference or finite volume techniques). One thought is to speed the solution of the large linear systems that have to be solved. Another is to decouple the reactive chemistry and solve that part of the problem on its own mesh using a different time step than is used for the transport part of the problem. Along the lines of the first thought, to speed the solution of the linear system, I have been wondering to what extent and how successfully people have been able to solve CFD type problems using multigrid techniques. Our problem does not involve shocks, so the solutions are at least continuous functions. However, there are large convective gradients in the flow and very large thermal gradients. So there is likely to be significant high frequency components to the solution. On the face of it, I would assume this makes multigrid a poor choice. However, I have had some private conversations with other local researchers who are working on CFD problems and who have indicated that this may not be the case. I would be interested in finding out if anyone has looked at such problems and could point me at some literature or at people to talk to. I would also entertain the idea of collaborating on this research if anyone has some clever ideas. John Prentice Quetzl Consulting Albuquerque, New Mexico john@spectre.unm.edu ------------------------------ From: John Prentice Date: Wed, 24 Jul 91 01:38:04 MDT Subject: Need Access to a 64k processor CM2 I am interested in running some quantum scattering calculations on the CM2. I have access to the one at NCSA and the one at the University of Maryland. These machines are fine for my smaller calculations and for development, but ultimately I need access to a CM2 with the full complement of processors and memory. The computationally intensive part of my problem is solving a complex valued dense linear system. I would appreciate any information of where and how to get access to such a system. John John K. Prentice john@spectre.unm.edu (Internet) Department of Physics and Astronomy University of New Mexico ------------------------------ From: American Mathematical Society Date: Tue, 23 Jul 91 10:45:19 EDT Subject: e-MATH Available from AMS e-MATH e-MATH is a node on the Internet providing mathematicians with the ability to electronically communicate with a central information source. Partially funded by a three-year National Science Foundation grant, e-MATH consists of a dedicated computer facility and associated software maintained and supported by American Mathematical Society staff members. It is intended that e-MATH become an electronically-based clearing house for timely professional and research information in the mathematical sciences. e-MATH currently offers a searchable, on-line Combined Membership List, a professional register for employment and postdoctoral opportunities, a repository of AMS-supported TeX software, the Mathematical Reviews classification scheme, and more. Planned future services include the on-line electronic distribution of the AMS Bulletin, two conferencing systems that would allow moderated and unmoderated conferences, and a prototype electronic journal in the mathematical sciences. To successfully connect to e-MATH, you need: o a connection to an INTERNET host; o VT100 connectivity in communications software and host operating system; o terminal tabs set at every eight columns. To access e-MATH, enter the command: telnet e-math.ams.com or telnet 130.44.1.100. Login and password are e-math. For further information or help, send e-mail to: support@e-math.ams.com. ------------------------------ From: SIAM Publications Department Date: Thu, 25 Jul 91 11:57 EDT Subject: SIAM Conference on Applied Linear Algebra Fourth SIAM Conference on Applied Linear Algebra September 11-14, 1991 Radisson Hotel Metrodome Minneapolis, Minnesota Sponsored by SIAM Activity Group on Linear Algebra Conference Themes Parallel Matrix Computations Direct Methods for Large and Sparse Systems Interior Point Methods in Mathematical Programming Rational Matrix Functions in Systems Theory Core Linear Algebra Numerical Methods for Markov Chains Signal Processing and Wavelets Linear Algebra in Statistics Deadline Dates Hotel Reservations August 23, 1991 Advance Conference Registration September 4, 1991 Organizing Committee Richard A. Brualdi, Chair University of Wisconsin, Madison David H. Carlson San Diego State University George Cybenko University of Illinois, Urbana-Champaign J. Alan George University of Waterloo, Canada Gene H. Golub Stanford University Roger A. Horn The Johns Hopkins University John G. Lewis Boeing Computer Services Mitchell B. Luskin University of Minnesota, Minneapolis Salvatore D. Morgera McGill University, Canada George P.H. Styan McGill University, Canada Paul Van Dooren Philips Research Laboratory, Belgium For a complete preliminary program, please contact SIAM, (siamconfs@wharton.upenn.edu) or write: SIAM Conference Department, 3600 University City Science Center, Philadelphia, PA 19104-2688; telephone: 215-382-9800; fax: 215-386-7999. ------------------------------ From: Claus Fuehrer Date: Wed, 24 Jul 91 17:31:19 MEZ Subject: Course in Germany on Simulation CCG-Course Announcement The Carl-Cranz Gesellschaft, a nonprofit society for engineering and scientific education is organizing a course on Numerical Integration Methods for the Simulation of Constrained and Unconstrained Mechanical Systems in Oberpfaffenhofen (near Munich), Germany, Sept. 30 - Oct. 2, 1991. The course outline: G.Bock, Augsburg - Concept of Modern Simulation Tools - Introduction to Numerical Integration Methods H.Pesch, Munich - One Step Methods P.Rentrop, Munich - Modern Implementations of Runge-Kutta and Multistep Methods - Stiff ODEs E.Eich, Augsburg - Numerical Treatment of ODEs with Discontinuities (with special emphasis on typical discontinuities occuring in mechanical systems) P.Rentrop, Munich - Differential-Algebraic Systems (DAEs) C.Fuehrer, Wessling - Mechanical Systems in DAE Formulation and their Numerical Treatment E.Eich/C.Fuehrer - Numerical Exercises with DASSL and ODASSL The course addresses engineers and mathematicians from research and development departments in industry and research institutions involved in the dynamic analysis of complex mechanical systems such as vehicles of all kinds, robots, mechanisms. It is also designed for faculty members, research associates, and graduate students specializing in the analysis and simulation of dynamic systems. Participation Fee: DM 1.260,- including detailed manuscripts (Members of German Universities may get a reduction on request) For more information, please contact: Claus Fuehrer, Inst. Dynamik der Flugsysteme, DLR, D-8031 Wessling or via e-mail: NA.FUEHRER@NA-NET.ORNL.GOV or DF37@DLRVM.EARN ------------------------------ From: Richard Sincovec Date: Tue, 23 Jul 91 09:14:57 -0400 Subject: Ada on Super-Computers Workshop ADA ON SUPERCOMPUTERS WORKSHOP TRI-ADA '91, San Jose, CA, October 21, 1991 Call for Participation and Contribution The top priority of users of supercomputers is performance. This workshop focuses on the ways that ADA can address this priority. Super-computers are becoming more wide spread because of inexpensive microprocessor technology and innovative computer architectures. These architectures rely extensively on parallelism in many forms and from fine grain to coarse grain. Ada with its numeric processing, tasking and generic abstraction features has the potential to address the growing problem of programming super-computers effectively. The aim of this workshop is to bring together interested super-computer users, Ada technologists, compiler vendors, computer manufacturers, and Ada 9X Mapping/Revision participants to address the following issues, each in a 1 and 1/2 hour session of panel and audience debate and discussion: 1) Users Needs Currently, FORTRAN is the lingua franca of super-computer users. What steps are needed to make Ada the language of choice for users of super-computers? 2) Compiler Technology Super-computer architectures require sophisticated compilers to achieve effective performance. Ada, for performance reasons, also requires a sophisticated compiler. How can both be accommodated? 3) Language Issues In some instances, the Ada Language Reference Manual restricts the use of parallel processing. Also, scientific users have specialized needs in handling floating pointing representation, storage and operation. What are the critical issues and what steps can be made to accommodate such issues now and in the Ada 9X revision process? 4) Wrap Up The results of the workshop (lists of issues, proposed solutions and recommendations) will be summarized and published in Ada Letters. If you are doing work related to any of these areas and would like to bring your expertise and point of view to bear on the above questions as a panelist, then we invite you to submit a short description (1-3 pages) of what your interests are and in which session you are interested in participating. Short position statements from invited panelists will start each session and then the floor will be opened by a moderator for debate and discussion with the panel and the audience. The dead-line for submitting a position brief as a speaker/panelist is August 8 1991. Selection of panelists will be made by August 25, 1991. The audience attendance is limited to about 75 persons so please contact me if you are interested in attending. Richard Sincovec ORNL P.O. Box 2008, Bldg 6012 Oak Ridge, TN 37831-6367 (615)574-3125 FAX: (615)574-0680 email: sincovec@msr.epm.ornl.gov ------------------------------ From: SIAM Publications Department Date: Wed, 24 Jul 91 09:43 EDT Subject: Contents: SIAM J. Math. Anal. Contents SIAM J. Math. Anal. November 1991, Vol. 22, Number 6 Ca( ) Solutions of a Class of Nonlinear Degenerate Elliptic Systems Arising in the Thermistor Problem Hong Xie and W. Allegretto Existence and Multiplicity of Positive Radial Solutions for Semilinear Elliptic Equations in Annular Domains Song-Sun Lin and Feng-Ming Pai Partial Regularity in Problems Motivated by Nonlinear Elasticity Nicola Fusco and and J. Hutchinson Period Doubling with Higher-Order Degeneracies Bruce B. Peckham and Ioannis G. Kevrekidis Variational Principles Without Definiteness Conditions Paul Binding and Qiang Ye Persistence of Invariant Tori in Systems of Coupled Oscillators. II. Degenerate Problems Masaji Watanabe and Hans G. Othmer The Existence of Infinitely Many Traveling Front and Back Waves in the FitzHugh-Nagumo Equations Bo Deng Stability Analysis of Stationary Solutions of Bistable Reaction-Variable Diffusion Systems Hideo Ikeda and Masayasu Mimura Integral Equation Methods in a Quasi-Periodic Diffraction Problem for the Time-Harmonic Maxwell's Equations J. C. Nedelec and F. Starling Diffusion of Fluid in a Fissured Medium with Microstructure R. E. Showalter and N. J. Walkington On Parabolic Volterra Equations in Several Space Dimensions Hong-Ming Yin Analyticity of Solutions of the Koreteweg-De Vries Equation Nakao Hayashi Geometry of Rational Functions and Nonlinear Integrable Systems Yoshimasa Nakamura The Interior Transmission Problem and Inverse Scattering from Inhomogeneous Media B. P. Rynne and B. D. Sleeman On the Inverse of the Discrete Two-Dimensional Wave Operator at CFL Robert Glassey, Ernst Horst, Andrew Lenard, and Jack Schaeffer Approximation by Piecewise Exponentials Junjiang Lei and Rong-Qing Jia On the Determination of Ziglin Monodromy Groups Richard C. Churchill and David L. Rod ------------------------------ End of NA Digest ************************** -------