**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.

-------------------------------------------------------

From: Sven Hammarling <SVEN@vax.nag.co.uk>

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 <sameh@csrd.uiuc.edu>

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 <rjl@math.ethz.ch>

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 <deepman@caen.engin.umich.edu>

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 <john@spectre.unm.edu>

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 <john@spectre.unm.edu>

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 <admin@e-math.ams.com>

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 <SIAMPUBS@WILMA.WHARTON.UPENN.EDU>

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 <DF37%DLRVM.BITNET@CUNYVM.CUNY.EDU>

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 <sincovec@sirius.epm.ornl.gov>

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 <SIAMPUBS@WILMA.WHARTON.UPENN.EDU>

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

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