To: na-comb@surfer.epm.ornl.gov Subject: NA Digest, Vol. 91, No. 7 Status: R Comment: Submissions for NA News Digest, mail to na.digest@na-net.ornl.gov. Comment: Information about NA-NET, mail to na.help@na-net.ornl.gov. Comment: Comments about the NA-NET, mail to nanet@na-net.ornl.gov. NA Digest Sunday, February 17, 1991 Volume 91 : Issue 7 Today's Editor: Cleve Moler Today's Topics: 1991 Householder Fellow Named Two Matrix Questions Postdoc Position at Cornell Board on Mathematical Sciences Call for Images CTAC91, Computational Techniques and Applications Conference on Computational Issues in Nonlinear Science ------------------------------ From: Bob Ward Date: Thu, 14 Feb 91 23:08:46 EST Subject: 1991 Householder Fellow Named June M. Donato has been selected as the winner of the 1991 Householder Fellowship in Scientific Computing at the Oak Ridge National Laboratory (ORNL). Ms. Donato is currently finishing her doctorate degree in Applied Mathematics at UCLA working with Prof. Tony Chan. Her research interests are in the numerical solution of partial differential equations via iterative techniques and parallel computing. Ms. Donato will be collaborating with the researchers in ORNL's Mathematical Sciences Section and with applied computational scientists in various divisions at ORNL on scientific problems involving high performance computing. Her primary interest will be on parallel iterative algorithms for solving large sparse systems resulting from the discretization of scalar and coupled systems of partial differential equations in three dimensions. Her fellowship appointment will begin this summer. The Householder Fellowship Program is supported by the Applied Mathematical Sciences Subprogram of the U.S. Department of Energy. ------------------------------ From: Klas Nordberg Date: Wed, 13 Feb 91 18:17:07 +0100 Subject: Two Matrix Questions Hello ! I have two questions for the na-net concerning matrices. Question #1 I know that for an anti-symmetric matrix A, exp(A) is always an orthogonal matrix with determinant = 1. I would like to know if this statement is reversible, ie is it always possible to write an orthogonal matrix Q with determinant = 1 as Q = exp(A), where A is an anti-symmetric matrix. Question #2 Let the matrices represent linear transformations in an N-dimensional vector space, where N = 2K. Denote a basis of this vector space with ai, bi, i=1,2,...,K. (i is used as an index here). Given this basis we can define K anti-symmetric matrices as follows Ai = ai bi' - bi ai' i=1,2,...,K where ' means transpose. All vectors are column vectors. Let S be an arbitrary symmetric matrix. Then Pi = Ai S - S Ai is a symmetric matrix for all i=1,2,...,K. My question is: are the matrices Pi always linear independent. If not, under what conditions are they linear independent. I am most interested in the case where S have just a few eigenvectors with non-zero eigenvalues. With best regards Klas Nordberg Department of Electrical Engineering Linkoping University Sweden Email: klas@isy.liu.se ------------------------------ From: Tom Coleman Date: Thu, 14 Feb 91 11:29:36 -0500 Subject: Postdoc Position at Cornell The Cornell Computational Optimization Project (CCOP) has available a postdoctoral research position beginning Fall 91. CCOP consists of about seven faculty, in both Computer Science and Operations Research at Cornell, as well as several researchers/postdocs. We are interested in all areas of COMPUTATIONAL OPTIMIZATION, continuous and discrete. If you are interested please send your vita (and list at least 3 references) to Professor T. Coleman Computer Science Cornell University Ithaca, NY 14850. You can also apply electronically: coleman@cs.cornell.edu ------------------------------ From: Hans Oser Date: Tue, 12 Feb 91 15:52:00 EDT Subject: Board on Mathematical Sciences Larry Cox has recently stepped down from the position of staff director, Board on Mathematical Sciences. An advertisement in the New York Times listed the following position to be filled: STAFF DIRECTOR BOARD ON MATHEMATICAL SCIENCES The National Research Council is seeking a Staff Director for its Board on Mathematical Sciences. Responsibilities include directing a professional staff, conducting a diverse set of studies in the mathematical sciences, and implementing those studies in concert with university, governmental, and industrial sectors. Requires PhD or equivalent in directly relevant field, 7-10 years relevant professional experience, extensive working familiarity with research in pure and applied mathematics and statistics, experience with administration and/or study project management, and excellent management and communication skills. Please send a resume, salary requirement, and the names of three references to Mr. Norman Metzger, NRC/CPSMA, 2101 Constitution Ave. NW, Washington, DC 20418. ------------------------------ From: Susan Goode Date: Wed, 13 Feb 91 12:31:45 CST Subject: Call for Images 1991 NCSA Science CD - CALL FOR IMAGES The National Center for Supercomputing Applications (NCSA) is again collecting data for a compact disk (CD). Copies of this CD will be available at various conferences in 1991 and through NCSA. The CD will contain public domain NCSA Scientific Software for the Macintosh, IBM PC, Sun, SGI and X Window servers. Among these software packages are NCSA Telnet, NCSA Image, NCSA DataScope, NCSA PalEdit, NCSA GelReader, NCSA Layout, NCSA Image IP, NCSA PC Show, NCSA ImageTool, NCSA CompositeTool, NCSA X Image, NCSA X DataSlice, NCSA HDF, etc. In addition to these programs, NCSA will include approximately 500-600 Mbytes of images and animation sequences from researchers around the world. Those of you who submitted images in April for the Apple Science CD Vol. 2 can expect to see the CD sometime in mid-1991. Although Apple had delayed the production of the CD to take advantage of various new advances in CD Rom technology, they intend to have the CD completed for SIGGRAPH '91. This CD, like NCSA's will be of ISO9660 format, readable by most CD-Rom players. NCSA is seeking examples of images that you have used in your research. The deadline is March 15, 1991. We hope to have this CD available in the second quarter of 1991. Details: I. TYPE Raster images and/or numerical data to produce raster images. Please include the numerical data whenever possible. II. SIZE Any size. Less than (640 x 480) preferred. III. BITS OF COLOR/GRAYSCALE- 8 bit or 24 bit. 8 bit preferred. IV. CATEGORIES - Unlimited number of entries in any or all categories A. Single- stand alone image. B. Group - set of images that may be related but are not intended to be animated. C. Animation - set of images which are intended to be played in sequence, for example by NCSA Image. V. CREDIT - For EACH example in EACH category you submit, please include textfile (MicroSoft Word or ASCII text) with information outlined below. BE AS CONCISE AS POSSIBLE! Title: give some SHORT name or title for the image(s) Description: describe the science and the content of the image(s). Please include the number of images, size in pixels (x by y), and the # of bits color or grayscale. Include the format and the details of associated palettes. Generation: list software/hardware used to generate and/or display the image. Author(s): list name, address, and E-mail address. Phone number is optional. Reference(s): (optional) list references to science involved Copyright: include a completed, signed copy of the attached copyright form. NCSA must receive this form prior to accepting your submissions for the CD. If at all possible attach a research article or abstract describing in detail the research being done or similar completed research. NCSA prefers disk copies but will also accept hardcopies. FORMAT - NCSA will try to handle any format, but the following are preferred: A. NCSA Hierarchical Data Format (HDF) - for images, palettes and numerical data. B. Raw raster/raw palette format. C. Numerical data in ASCII using NCSA DataScope format. VII. MEDIA - (NO MEDIA WILL BE RETURNED!) Please include the numerical data whenever possible. A. Mail MAC disk(s) B. Mail a UNIX tar formatted 1/4" cartridge or 1/2" reel tape. PLEASE specify the tar command to create the tape and on what machine and Operating System. C. Use anonymous FTP and put them in directory pub or incoming. NCSA server has IP # 128.174.20.50. You MUST E-mail Susan Goode (address listed below) when you have done so. NCSA disk space is limited. D. Send small files in either binhex/SuffIt format or UNIX compressed/uuencode format via E-mail to Susan Goode (address listed below). VIII. CONTACT - All submissions and questions to: US MAIL: Susan Goode - NCSA Science '91 CD Project NCSA Software Tools Group 152 Computing Applications Building 605 East Springfield Avenue Champaign, Illinois 61820 E-MAIL: sgoode@ncsa.uiuc.edu (Internet) or sgoode@ncsavms (bitnet) Thank you, Susan Goode CD Project Coordinator ------------------------------------------------------- From: Len Colgan Date: Tue, 12 Feb 91 11:25 +1030 Subject: CTAC91, Computational Techniques and Applications CTAC91 Computational Techniques and Applications Conference 15-17 July, 1991 Adelaide, South Australia Second Announcement and Final Call for Papers This biennial conference provides an interactive forum for scientists, engineers and mathematicians interested in the use and development of more efficient computational techniques and their application to engineering, scientific and other problems. The conference programme will include invited lectures, contributed papers and poster sessions. The topics of the invited and review lectures are structured to achieve a balance between computational techniques and applications and will be presented by distinguished overseas and Australian research workers. The contributed papers will focus on specific research topics and will be of a somewhat shorter duration. The Conference Proceedings will be published in hardback form. Preprints of all papers will be available to delegates at the conference. All sessions will be held at The University of Adelaide situated within 5 minutes walk of the city centre. Organising Committee Assoc. Prof. B.J. Noye (Chairman) University of Adelaide G.P.O. Box 498 Adelaide, 5001 South Australia Phone: (08) 228 5075 Fax: (08) 224 0227 B.R. Benjamin (Director) University of South Australia The Levels, 5095 South Australia Phone: (08) 343 3084 Fax: (08) 349 4367 Email: mabrb@sait.edu.au L.H. Colgan (Treasurer) University of South Australia The Levels, 5095 South Australia Phone: (08) 343 3038 Fax: (08) 349 4367 Email: malhc@sait.edu.au or na.colgan@na-net.ornl.gov Dr. S. Elhay University of Adelaide Dr. W. Henderson University of Adelaide Dr. J. Kautsky Flinders University of South Australia L.M. Sheppard DSTO Ordnance Systems Division Call For Papers Authors are invited to submit original papers on specific research topics following the guidelines outlined in the preamble. An abstract of not more than 500 words must be submitted by 27 February 1991. Three copies of each abstract are required and should be sent to Assoc. Prof. B.J. Noye at the address given below. Authors of papers accepted for presentation are required to provide sufficient preprints for all registrants. Assoc.Prof. B.J. Noye Department of Applied Mathematics University of Adelaide G.P.O. Box 498 Adelaide, 5001 South Australia AUSTRALIA Phone: (08) 228 5075 Fax : (08) 224 0227 Registration Registration will take place on the afternoon and evening of 14 July, 1991. The registralian fee will cover the reception, morning and afternoon teas and conference dinner. Those who would like to purchase a copy of the published conference proceedings at discounted price should indicate on the registration form. The Registration fee is: $A200 $A190 for AMS members $A125 Students A discount of $A25 will apply to all registrations paid before 1 June 1991. Student Prize A prize of $A250 will be awarded to the student who is judged to have presented the best contributed paper. Workshops A two day Workshop will be arranged on 18,19 July, involving practical access to a CRAY supercomputer. Further details, including costs, are available on request. Further information concerning the conference and workshops can be obtained from: Len Colgan School of Mathematics & Computer Studies University of South Australia The Levels South Australia, 5095 AUSTRALIA Phone: (08) 343 3038 Fax: (08) 349 4367 Email: malhc@sait.edu.au or na.colgan@na-net.ornl.gov ------------------------------ From: Mac Hyman Date: 14 Feb 91 00:08:40 GMT Subject: Conference on Computational Issues in Nonlinear Science The 11th Annual International Center for Nonlinear Studies Conference on Experimental Mathematics: Computational Issues in Nonlinear Science Will be held at the J. R. Oppenheimer Study Center, Los Alamos, New Mexico May 20-24, 1991 This conference will focus on computational issues, numerical methods and mathematical models for reliable, efficient computer simulations of nonlinear phenomena. There will be survey talks on current research and applications of numerical methods for solving ordinary and partial differential equations, including adaptive grid generation, symplectic difference approximations, methods for multiple time and space scales, and methods for solving large nonlinear systems. Special talks will highlight some of the recent advances in simulations and analysis of chaotic dynamics. There will be talks on the models and capabilities of the major computer codes for global climate change, turbulence modeling and large scale simulations of complex fluid flows. Also, speakers will describe the revolution in scientific computing environments and visualization techniques. Speakers and topics include: Chris Anderson (UCLA) Vortex methods for computational fluid dyanmics Tom Banks (USC) Parameter estimation Tony Chan (UCLA) Domain decomposition methods for PDEs Shi-Yi Chen (LANL) Lattice gas methods for complicated flows Phil Colella (UCB) Computational fluid dynamics Ken Eggert (LANL/EES) Lattice gas methods for complicated flows Bjorn Engquist (UCLA) Numerical methods and homogenization Joe Flaherty (RPI) Adaptive mesh methods for PDEs Peter Ford (LANL) Man/Machine interfaces, distributed computer systems Bill Gear (NEC) Methods with Special Properties Gary Glatzmaier (LANL) Modeling the global 3D dynamics of the Earth's atmosphere and interior Celso Grebogi (U Md) Simulations and analysis of chaotic dynamics Leslie Greengard (NYU) Fast algorithms for particle simulations Chuck Hansen (LANL) Visualization of scientific data Bill Henshaw (IBM) Spectral and vortex methods for calculating fluid flows Ahied Iserles (Cambridge) Analysis of numerical methods for ODEs Heinz-Otto Kreiss (UCLA) Multiple time and space scales in PDEs Peter Lax (NYU) Deterministic analogues of turbulence Tom Manteuffel (UC Denver) Adaptive acceleration methods for algebraic systems Bill Newman (UCLA) Scaling laws for failure in self-similar systems Stan Osher (UCLA) Image enhancement using nonlinear PDEs Linda Petzold (LLNL) Numerical methods for differential algebraic systems Jeff Saltzman (LANL) Adaptive mesh methods for PDEs J. M. Sanz-Serna (U. Valadolid) Numerical methods for differential equations Gil Strang (MIT) Wavelets and numerical methods Edriss Titi (Cornell/UC Irvine) Approximations of inertial manifolds Greter Tryggvason (U. Mich) Dynamics and modeling of interfaces Burt Wendroff (LANL) Numerical methods for PDEs Art Winfree (UAz) Pattern formation in biological systems The refereed proceedings will be published in a special hardbound special issue of the Physica D Journal. There will be two poster sessions for the participants to present their research and computational models. The participants presenting posters may also submit a paper for publication in the proceedings. If you wish to present a poster, please send a title and abstract to the address below before May 1. There will be a few grants (averaging $200 each) to help cover the expenses of participants presenting posters. These grants are primarily for students and other young researchers without other sources of financial support to attend the meeting. If you wish to be considered for this partial support, please indicate it when you submit your poster abstract. Non-US Citizens must supply visa information to the Center for Nonlinear Studies before March 4th and receive approval from the Department of Energy before attending the conference. We ask that these participants reply as soon as possible to receive the necessary forms. For more information contact Mac Hyman, (505) 667-6294, jh@lanl.gov or Barbara Rhodes (505) 667-1444, office@cnls.lanl.gov, FAX (505) 665-2659 The 11th Annual International Conference is sponsored by the U.S. Department of Energy, Applied Mathematical Sciences Program and the Center for Nonlinear Studies, Los Alamos National Laboratory. ------------------------------ End of NA Digest ************************** -------