- Today's Editor:
- Cleve Moler
- The MathWorks, Inc.
- moler@mathworks.com

- NA Digest Calendar
- Variational Principles and Convexity Check
- 3D Navigation Problem
- X-window Sparse Matrix Viewer
- Questions about Electromagnetic Diffractive Tomography
- Temporary Address Change for J. C. Diaz
- Change of Address for George Byrne
- Change of Address for Andrew Knyazev
- Phone Numbers at Rutgers
- Computational Science and Engineering WWW Node at Clemson
- ICASE/LaRC Course: Optimal Design & Control
- Pacific Northwest Numerical Analysis Seminar
- Contents, J. of Approximation Theory
- Contents, I. J. Computational Fluid Dynamics

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

From: NA Digest <na.digest@na-net.ornl.gov>

Date: July 31, 1994, 14:00 MDT

**Subject: NA Digest Calendar**

NA Digest Calendar

Date Topic Place NA Digest #

Aug. 1- 4 Computation Physics Lyngby, Denmark 11

Aug. 1- 5 Computational Science Workshop Los Alamos, NM 16

Aug. 10 Sparse Matrices Lyngby, Denmark 29

Aug. 15-19 Math Programming Ann Arbor, MI

Aug. 21-26 Numerical Methods Sofia, Bulgaria 30

Aug. 22-25 Continuum Mechanics Prague, Czech Rep. 6

Aug. 22-25 SVD and Signal Processing Leuven, Belgium 23

Aug. 22-25 Simulation Zurich, Switzerland 9

Aug. 29-31 Algorithms and Parallel VLSI Leuven, Belgium 23

Aug. 29... Mathematical Modelling Prague, Czech Rep. 1

Sep. 6-10 Mathematics in Industry Kaiserslatern, Germany 7

Sep. 12 Scottish Computational Mathematics Strathclyde, Scotland 23

Sep. 22-24 Hellenic Mathematical Society Athens, Greece 8

Sep. 25-30 Computers and Mathematics Harare, Zimbabwe 28

Sep. 26-27 Acoustics and Electromagnetics Washington, DC 19

Sep. 26-28 Multilevel Methods Meisdorf, Germany 16

Sep. 26-28 Large-Scale CFD Problems Montreal, Canada 24

Sep. 26-30 Total Positivity Jaca, Spain 5

Sep. 26 Dynamics of Discontinuous Systems Bristol, UK 20

Sep. 30... Algorithms for Macromolecular Modeling Lawrence, KA 28

Oct. 2- 6 Applications of Operator Theory Winnipeg, Manitoba 17

Oct. 6- 7 Combustion, Environment, and Heating Columbus, Ohio 21

Oct. 6- 7 Large Systems of Equations Wuppertal, Germany 23

Oct. 9-11 European PVM Users Rome, Italy 30

Oct. 12-14 Scalable Parallel Libraries Mississippi State, MS 24

Oct. 13-14 60th birthday of Jean Descloux Lausanne, Switzerland 19

Oct. 17-20 Parallel Computational Fluid Dynamics Stuttgart, Germany 30

Oct. 18-21 High Performance Fortran Manno, Switzerland 24

Oct. 20-22 Systems, Control, Information Wuhan, China 8

Oct. 22 Pacific Northwest N.A. Seminar Pullman, WA 31

Oct. 24-26 Computational Molecular Dynamics Minneapolis, MN 19

Oct. 26-28 Singularities in PDEs Bristol, UK 26

Nov. 7- 9 Adaptive Grid Methods Hampton, VA 26

Nov. 12 Matrix Theory Salt Lake City, UT 21

Nov. 18 Parallell Computing Applications Utrecht, Nethelands 24

Nov. 14-18 SuperComputing '94 Washington, DC 6

Nov. 30... Computational Methods in Engineering Belo Horizonte, Brazil 11

Dec. 16-19 Methods and Applications of Analysis Hong Kong 25

1995

Jan 3- 6 Computational Computer Design Maui, Hawaii 17

Jan. 9-10 Conference Honoring Ake Bjorck Linkoping, Sweden 26

Jan. 15-18 Bond Graph Modeling and Simulation Las Vegas, NV 4

Jan. 16-18 Markov Chains Raleigh, NC 7

Jan. 23-27 Optimal Design and Control Newport News, VA 31

Feb. 6- 9 Massively Parallel Computation McLean, VA 26

Feb. 8-10 Computational Issues in the Geosciences San Antonio, TX 27

Feb. 15-17 SIAM Conference on Parallel Processing San Francisco, CA

Feb. 19-25 Applications of Interval Computations El Paso, TX 16

Mar. 17-18 Krylov Subspace Methods Raleigh, NC 29

Mar. 20-21 Nonconvex Energy Functions Rutgers, NJ 20

Mar. 28... Sci. Computation & Diff. Eqns. Stanford, CA 27

Apr. 2- 7 Multigrid Methods Copper Mountain, CO 30

Apr. 3- 6 Numerical Methods for Fluid Dynamics Oxford, UK 25

Apr. 24-28 3rd INRIA-SIAM Wave Propagation Conf. Juan-les-Pins, France 19

Apr. 26-30 Numerical Analysis & Applied Math. Constanza,Romania 26

June 6-10 Inertial Manifolds Xi'an, China 21

June 18-21 Iterative Methods in Linear Albebra Blagoevgrad, Bulgaria 30

June 20-24 Honoring G. I. Marchuk Novosibirsk, Russia 28

July 3- 7 ICIAM, Int'l Cong. Indust. Appl. Math. Hamburg, Germany 23

July 10-12 Linear Algebra and Applications Manchester, UK 19

July 16... Mathematics of Numerical Analysis Park City, UT 5

July 17-21 Distributed Parameter Systems Warsaw, Poland 25

Aug. 27-31 Circuit Theory and Design Istanbul, Turkey 25

Sep. 17-21 Acoustics of Submerged Structures Boston, MA 22

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

From: Arnold Neumaier <neum@research.att.com>

Date: Mon, 25 Jul 94 09:30 EDT

**Subject: Variational Principles and Convexity Check**

1. Has anyone seen any work related to the following `local' variational

principle?

Find x such that z=x is a local minimizer of f(x,z),

where f(x,z) is C^2 and bounded below for each fixed x.

Many dissipative problems have a presentation in the above form,

e.g., fluid dynamics equations (P. Glansdorff and I. Prigogine,

Thermodynamic theory of structure, stability and fluctuations,

Wiley 1971, Chapter 10).

Using the optimality conditions one can rephrase the problem to

get the nearly equivalent problem

Find x such that f_z(x,x)=0 and f_{zz}(x,x) is positive semidefinite.

It would be interesting to have numerical methods that do not require

explicit second derivative information but can approximate it in a

quasi-Newton manner.

2. Given m data points (x_i,f_i) in R^n x R, are there necessary and

sufficient conditions that there is a convex function f with

f(x_i)=f_i for i=1,...,m? (For n=1, it suffices to check that the

second divided differences of adjacent triples of points are

nonnegative.)

Arnold Neumaier

neum@research.att.com (until August 26, 1994)

neum@cma.univie.ac.at (after September 1, 1994)

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

From: Rob MacLeod <macleod@vissgi.cvrti.utah.edu>

Date: Mon, 25 Jul 94 13:59:29 -0600

**Subject: 3D Navigation Problem**

"Everyone" knows that to find a point in 3-space, the distances from three

known points to the desired point are all that is required (as long as the

desired point does not lie in the plane of the other three). Where we are

stuck is solving the resulting (nonlinear) system of equations in some sort

of efficient manner.

The application is reconstructing torso geometries in experimental

cardiology (read "We are not mathematicians"), but the problem is clearly

much more general, for example in navigation. Hence, there have to be some

reasonable solutions out there.

Thanks in advance for any tips.

Rob MacLeod

Nora Eccles Harrison Cardiovascular Research and Training Institute (CVRTI)

Building 500, University of Utah

Salt Lake City, Utah 84112

Internet: macleod@cvrti.utah.edu

Phonemail: (801)581-8183

Fax: (801)581-3128

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

From: T. J. Garratt <garratt@atuk.aspentec.com>

Date: Thu, 28 Jul 1994 19:33:43 GMT

**Subject: X-window Sparse Matrix Viewer**

Wanted: X-window sparse matrix viewer

I'm sure one of these must be about someplace, but I'm looking for a program

that can be used to view sparse matrices of variable order using the X

protocol. That is, you give the program a non-zero sparsity pattern and an X

window pops up graphically showing the sparsity pattern with, say, a pixtel

for each non-zero.

Sounds nice... perhaps someone has produced one in their spare time.

Any hints of where to fine such a code would be most welcome.

Tony Garratt

garratt@atuk.aspentec.com

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

From: John Prentice <johnp@amber.unm.edu>

Date: Thu, 28 Jul 94 16:27:07 MDT

**Subject: Questions about Electromagnetic Diffractive Tomography**

I am designing an electromagnetic diffractive tomography system for use

in conjunction with a ground penetrating radar experiment. One of the

books I have been reading to come up to speed on this subject is "Principles

of Computerized Tomographic Imaging" by Kak and Slaney, published

in 1988 by IEEE. So, first question, does anyone have a recommendation

for better books to look at? Next, the authors of this book make two

interesting claims. The first is that a vector theory for diffractive

tomography had not yet been developed as of when they wrote their book.

By a vector theory, they mean a theory that is based on the vector

wave propagation equation for an electromagnetic field in a nonlinear

dielectric medium. Everything they do is using a scalar wave equation.

I am curious if this is still true, does anyone know of a diffraction

tomography theory that is based on the full vector wave equation?

My next question, these authors also comment that diffractive

tomography based on a higher order Born series is a subject of current

research. I am anxious to find out what has been done on this since

their book was written. Is anyone familiar with diffractive tomography

that is not based on the 1st order Born approxiation or the first order

Rytov approximation? A final related question, is anyone familiar

with a diffractive scattering/tomography theory that is posed in terms

of modern operator theory, analogous to quantum scattering theories

based on the operator form of the Lippman-Schwinger equation for the

transition and scattering operators?

I appreciate the help!

John

John K. Prentice

Quetzal Computational Associates

3701 San Mateo N.E., Suite I, Albuquerque, NM 87110-1249 USA

Phone: 505-883-3706 E-mail: quetzal@aip.org or prentice@cs.unm.edu

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

From: J. C. Diaz <diaz@babieco.mcs.utulsa.edu>

Date: Wed, 27 Jul 94 08:49:17 CDT

**Subject: Temporary Address Change for J. C. Diaz**

Temporary address change for J. C. Diaz while on Sabbatical in

Spain from July 21, 1994 through January 5, 1995.

The business address will be:

Profesor J. C. Diaz

Departamento de Matematica Aplicada y Computacion

Facultad de Ciencias

Universidad de Valladolid

Cl. Prado de la Magdalena S/N

47005-Valladolid

Spain, VIA AIRMAIL

Fax 011-(34)-83-42-3013 (Must state Dept name completely)

Tel 42-3181 (office)

30-6856 (home)

The email will remain

diaz@babieco.mcs.utulsa.edu

Home address:

Cl. Canovas del Castillo 11, 3-H

47002 - Valladolid

Spain, VIA AIRMAIL

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

From: George Byrne <MATHBYRNE@minna.acc.iit.edu>

Date: Wed, 27 Jul 1994 11:45:50 -0500 (CDT)

**Subject: Change of Address for George Byrne**

George D. Byrne was recently appointed Professor and Chairman, Department of

Mathematics, Illinois Institute of Technology, 10 West 32nd Street,

Chicago, Il 60616-3793. e-mail: mathbyrne@minna.acc.iit.edu

or gbyrne@na-net.ornl.gov

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

From: Andrei Knyazev <knyazev@WIDLUND.CS.NYU.EDU>

Date: Sat, 30 Jul 94 15:25:59 -0400

**Subject: Change of Address for Andrew Knyazev**

Andrew Knyazev, formerly a senior researcher at the Institute

of Numerical Mathematics Russian Academy of Science, Moscow, and then

a visitor at the Courant Institute of Mathematical Science, NYU,

has accepted a position as an associate professor in the Departament

of Mathematics at the University of Colorado at Denver.

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

From: Eduardo Sontag <sontag@control.rutgers.edu>

Date: Tue, 26 Jul 94 17:04:25 BST

**Subject: Phone Numbers at Rutgers**

PHONE NUMBERS AT RUTGERS ABOUT TO CHANGE

Around Sept 1, 1994, the three-digit prefix for the telephone numbers of

individuals, as well as administrative offices, at several Rutgers departments

(in the New Brunswick-Piscataway campus), including among others:

MATHEMATICS and COMPUTER SCIENCE

will change, from "932" to "445". The actual numbers (last 4 digits) will

remain the same. Thus the change is given by the following rule:

+1 908.932.abcd --> +1 908.445.abcd

Please take note.

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

From: Steve Stevenson <steve@cs.clemson.edu>

Date: Tue, 26 Jul 94 11:39:21 EDT

**Subject: Computational Science and Engineering WWW Node at Clemson**

Clemson University CSE Program (joint mathematical science-computer science)

has a WWW node at http://www.cs.clemson.edu/CSE/homepage.html.

This node is oriented towards undergraduate and graduate education. There

are pointers to many of the educational programs around the world, as well

as course materials and software.

We have tried to keep up with the notices that come across the net. If

we've missed you and you want to provide a URL, please contact

steve@cs.clemson.edu.

Steve Stevenson

Computer Science

steve@cs.clemson.edu

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

From: Natalia Alexandrov <natalia@icase.edu>

Date: Wed, 27 Jul 1994 11:25:29 -0400

**Subject: ICASE/LaRC Course: Optimal Design & Control**

ICASE/LaRC SHORT COURSE ON OPTIMAL DESIGN AND CONTROL

January 23-27, 1995

OMNI Hotel, Newport News, Virginia

We are pleased to announce that the Institute for Computer Applications

in Science and Engineering (ICASE) and NASA Langley Research Center

(LaRC) will conduct a Short Course on Optimal Design and Control at the

OMNI Hotel, Newport News, Virginia from January 23-27, 1995.

The course is intended primarily for scientists and engineers as an

overview of the state-of-the-art in the theory and practice of

optimization-based design and control. On the theoretical side, there is

now a general framework that allows for a unified treatment of optimal

nonlinear control, linear feedback control, robust control, and optimal

design for both lumped and distributed parameter systems. At the

same time, there have been tremendous breakthroughs in the development

of computational methods for design and control. The goal of this short

course is to present an overview of these new results and to provide

engineers and control scientists with practical working knowledge of these

new theories and computational tools. Special attention will be paid to

applications in order to illustrate, by examples, the use of theoretical

and computational ideas presented in the lectures.

There will be four one-and-one-half hour lectures a day. The week-long

course is intended to provide a total of approximately 30 hours of

lectures. Course notes will be provided to all participants in order to

facilitate discussion during the lecture periods. The lecturers and

course topics are as follows:

John Burns, Virginia Polytechnic Institute and State University

Optimal Design (open loop distributed parameter

optimal control; shape optimization with applications

to fluids; inverse problems and parameter estimation)

H. Thomas Banks, North Carolina State University

Linear Feedback Control (linear quadratic regulator

(LQR) and Kalman filter; min-max control; tracking

problems and disturbance attenuation with applications

to structures and acoustics)

Ruth Curtain, University of Groningen, The Netherlands

Robust Control (H* control design; finite dimensional

compensators for infinite dimensional systems; robust

stabilization of infinite-dimensional systems with

respect to coprime factor perturbations)

Christopher Byrnes, Washington University, St. Louis, Missouri

Nonlinear Control (nonlinear control of distributed

parameters systems; optimal feedback control; Riccati

partial differential equations)

Alan Laub, University of California, Santa Barbara

Computational Control (stability and conditioning of

numerical algorithms for control design; numerical

solution of coupled Riccati equations)

Due to space considerations, attendance will be limited. There will be a

registration fee which is still undecided. If you wish to attend or

would like further information, please get in touch with

Natalia Alexandrov

ICASE, Mail Stop 132C

NASA Langley Research Center

Hampton, VA 23681-0001

Tel. 804-864-7059

FAX: 804-864-6134

e-mail: natalia@icase.edu

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

From: Alan Genz <acg@eecs.wsu.edu>

Date: Thu, 28 Jul 94 16:25:20 -0700

**Subject: Pacific Northwest Numerical Analysis Seminar**

PACIFIC NORTHWEST

NUMERICAL ANALYSIS SEMINAR

October 22, 1994

Department of Mathematics

Washington State University

Pullman, Washington 99164-3113

ORGANIZERS:

Alan Genz, acg@eecs.wsu.edu

Kevin Cooper, kcooper@beta.math.wsu.edu

V.S. Manoranjan, mano@beta.math.wsu.edu

INFORMATION:

The annual PNWNAS will be held this year on Saturday, October 22, at

Washington State University. The purpose of this conference is to bring

together research workers in Numerical Analysis from companies and

universities in the Pacific Northwest, to meet and discuss recent work.

The format this year will consist of some invited talks, several

contributed talks and a poster session. If you would like to present a

contributed talk or poster, please send a title and short abstract by

September 25 to Alan Genz. We encourage contributions from graduate

students. We plan to have a special graduate student presentation. If you

are a graduate student who would like to be considered for this, please

send a title and 2-3 page extended abstract to Alan Genz by September 25.

There will not be a registration fee, but a conference buffet dinner will

be organized, and there will be a charge of $15 per person.

Please contact me via email before Oct. 14 for an electronic registration

form. And, please forward this announcement to graduate students and

colleagues.

Alan Genz, acg@eecs.wsu.edu

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

From: Marilyn Radcliff <radcliff@math.ohio-state.edu>

Date: Mon, 25 Jul 1994 15:45:02 -0400 (EDT)

**Subject: Contents, J. of Approximation Theory**

Table of Contents

Journal of Approximation Theory, Volume 77, Number 3, June 1994

A. L. Levin and D. S. Lubinsky. $L_p$ Markov-Bernstein Inequalities for

Freud Weights, 229-248.

M. W. Bartelt and J. J. Swetits. Characterization of the Local Lipschitz

Constant, 249-265.

Li Chong and G. A. Watson. On Approximation Using a Peak Norm, 266-275.

Eduard Danielian and Karen Tatalian. Sign-Change Diminishing Systems of

Functions of Many Variables, 276-281.

Paul Nevai and Yuan Xu. Mean Convergence of Hermite Interpolation, 282-304.

H. G. Meijer. Sobolev Orthogonal Polynomials with a Small Number of Real

Zeros, 305-313.

Aleksei Shadrin. On $L_p$-Boundedness of the $L_2$-Projector onto Splines,

331-348.

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

From: Grant Guevremont <grantg@CERCA.UMontreal.CA>

Date: Thu, 28 Jul 1994 12:44:04 -0400

**Subject: Contents, I. J. Computational Fluid Dynamics**

Contents

INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS

Vol. 2, No. 2, 1994

Single Stage Rocket Performance Prediction and Test

T. P. Gielda, T. M. Walter and R. K. Agarwal

Covolume-Dual Variable Method for Thermally Expandable

Flow on Unstructured Triangular Grids

C. A. Hall, T. A. Porsching and P. Hu

A Direct Numerical Simulation of Channel Flow Transition

Under an External Body Force

C. C. Hao and J. N. Chung

Development of a Reynolds Stress Model With a Cross

Diffusion of k in the 'epsilon' Equation

R. R. Hwang and Y. F. Peng

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

End of NA Digest

**************************

-------