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Search Publications by: Anthony J. Kearsley ()

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Displaying 51 - 72 of 72

Development of NIST SRM 2881, an Absolute Molecular Mass Distribution Polymer Standard

September 1, 2006
Author(s)
William E. Wallace, Charles M. Guttman, Kathleen M. Flynn, Anthony J. Kearsley
We present a strategy to create an absolute molecular mass distribution polymer Standard Reference Material. To create a standard our methods must be free of operator bias (intentional or unintentional). The steps include sample preparation, instrument

Recovering Circles and Spheres from Point Data

July 1, 2006
Author(s)
Christoph J. Witzgall, Geraldine Cheok, Anthony J. Kearsley
Methods for fitting circles and spheres to point sets are discussed. LADAR (LAser Detection And Ranging) scanners, in particular, are capable of generating "point clouds" containing the x, y, z coordinates of up to several millions of points reflecting the

Recovering Spheres from 3D Point Data

April 1, 2006
Author(s)
Christoph J. Witzgall, Geraldine Cheok, Anthony J. Kearsley
The National Institute of Standards and Technology is involved in developing standard protocols for the performance evaluation of 3D imaging systems, which include laser scanners and LADARs (LAser Detection and Ranging). A LADAR is an optical device that

Projections Onto Order Simplexes and Isotonic Regression

March 31, 2006
Author(s)
Anthony J. Kearsley
We begin this expository essay by reviewing with examples what a typical engineer already knows about statistics. We then consider a central question in engineering decision making, i.e., given a computer simulation of high-consequence systems, how do we

A Numerical Method for Mass Spectral Data Analysis

January 31, 2005
Author(s)
Anthony J. Kearsley, William E. Wallace, Javier Bernal, Charles M. Guttman
The new generation of mass spectrometers produces an astonishing amount of high-quality data in a brief period of time leading to inevitable data analysis bottlenecks. Automated data analysis algorithms are required for rapid and repeatable processing of

An Operator-Independent Approach to Mass Spectral Peak Identification and Integration

May 1, 2004
Author(s)
William E. Wallace, Anthony J. Kearsley, Charles M. Guttman
A mathematical algorithm is presented that accurately locates and calculates the area beneath mass spectral peaks using only reproducible mathematical operations and a NO user-selected sensitivity parameters. This represents a major refinement of last year

Simulation of an Austenite-Twinned-Martensite Interface

November 1, 2003
Author(s)
Anthony J. Kearsley, L A. Melara
Developing numerical methods for predicting microstructure in materials is an extremely large and important research area. Two examples of material microstructures are Austenite and Martensite. Austenite is a microscopic phase with simple crystallographic

An Optimization Approach to Multiple Sequence Alignment

July 1, 2003
Author(s)
Fern Y. Hunt, Anthony J. Kearsley, H H Wan
The problem of multiple sequence alignment is recast as an optimization problem using Markov decision theory. One seeks to minimize the expected or average cost of alignment subject to data-derived constraints. In this setting the problem is equivalent to

Optimality Conditions for Hierarchical Control

November 7, 2002
Author(s)
P Boggs, Anthony J. Kearsley, J W. Tolle
Abstract As part of the study of techniques for solving PDE-constrained optimization problems, we consider the approximate pointwise control of a linear parabolic system with multiple targets. Assuming a hierarchy among the objectives, we derive optimality

Advanced Numerical Methods for Polymer Mass Spectral Data Analysis

July 1, 2002
Author(s)
William E. Wallace, Charles M. Guttman, Anthony J. Kearsley, Javier Bernal
A mathematical algorithm is presented that accurately locates and calculates the area beneath peaks using only reproducible mathematical operations and a single user-selected sensitivity parameter.

Global and Local Optimization Algorithms for Optimal Signal Set Design

April 1, 2001
Author(s)
Anthony J. Kearsley
The problem of choosing an optimal signal set for non-Gaussian detection was reduced to a smooth inequality constrained mini-max nonlinear programming problem by Goeckenbach and Kearsley (SIAM J. Opt., 1998). Here we consider the application of several

Effect of Ag on the Primary Phase Field of High T c (Bi,Pb)-2223 Superconductor

February 1, 2000
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J. Kearsley
The subsolidus equilibria and the primary phase field (crystallization field) of the 110K high T c (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) superconductor in the presence of Ag have been determined under 7.5 volume % O 2 (92.5 % Ar). A total of 29 six-phase volumes