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Mathematics & Statistics

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Displaying 801 - 825 of 872

Analytic Continuation, Singular Value Expansions, and Kramers-Kronig Analysis

January 17, 2001
Author(s)
Andrew M. Dienstfrey, L Greengard
We describe a systematic approach to the recovery of a function analytic in the upper half plane, ${\bfC:^+$, from measurements over a finite interval on the real axis, $D\subset {\bfR}$. Analytic continuation problems of this type are well-known to ill

Direct Blind Deconvolution II. Substitute Images and the Beak Method

November 1, 2000
Author(s)
Alfred S. Carasso
The BEAK method is an FFT-based direct blind deconvolution technique previously introduced by the author, and applied to a limited but significant class of blurs that can be expressed as convolutions of 2-D symmetric L vy probability density functions

Attractors, Chain Transitive Sets and Invariant Measures

September 15, 2000
Author(s)
Fern Y. Hunt
This paper discusses an easy to implement procedure for approximating the long time behavior of iterates of maps. Applications include to finding the roots of a complex polynomial and approximating attractors. The method uses the theory of Markov chains.

Zoltan: Data-Management Services For Parallel Applications Developer's Guide

June 30, 2000
Author(s)
K Devine, B Hendrickson, E Boman, M St. John, C Vaughan, William F. Mitchell
The Zoltan Dynamic Load-Balancing Library provides critical capability to a number of parallel applications. Zoltan includes a suite of algorithms for dynamically computing partitions of problems over sets of processors; geometric, tree-based and graph

Zoltan: Data-Management Services For Parallel Applications; User's Guide

June 30, 2000
Author(s)
K Devine, B Hendrickson, E Boman, M St. John, C Vaughan, William F. Mitchell
The Zoltan Dynamic Load-Balancing Library provides critical capability to a number of parallel applications. Zoltan includes a suite of algorithms for dynamically computing partitions of problems over sets of processors; geometric, tree-based and graph

On the Bifurcation From Continuous to Segmented Chip Formation in Metal Cutting

February 6, 2000
Author(s)
Timothy J. Burns, Matthew A. Davies, Christopher J. Evans
We describe a new approach to modeling chip formation in orthogonal machining. Metal cutting is interpreted as a nonlinear dynamical process with thermomechanical feedback, which is similar in many ways to an open chemical reactor. As the cutting speed is

The DLMF Project: A New Initiative in Classical Special Functions

June 1, 1999
Author(s)
Daniel W. Lozier
NIST (formerly, National Bureau of Standards) has started an ambitious project that aims to produce a successor to Abramowitz and Stegun's {\em Handbook of Mathematical Functions}, published by the National Bureau of Standards in 1964 and reprinted by

Stable Quasicrystalline Sphere Packing

March 1, 1999
Author(s)
Eric J. Cockayne, M Mihalkovic
Wills (1990, J. Phys., Paris 51, 1061), found a method relating certain decagonal disk packings to decagonal sphere packings with high packing fractions. Applying this technique to the decagonal rectangle-triangle tiling generated by inflation, we obtain a