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Displaying 52626 - 52650 of 74505

Truncating the Singular Value Decomposition for Ill-Posed Problems

July 1, 1998
Author(s)
Bert W. Rust
Discretizing the first-kind integral equations which model many physical measurement processes yields an ill-conditioned linear regression model. Least squares estimation usually gives a sum of squared residuals much smaller than the expected value and a

Use of Kirkpatrick-Baez Multilayer Optics for X-Ring Fluorescence Imaging

July 1, 1998
Author(s)
A S. Bakulin, S M. Durbin, C Liu, J Erdmann, A T. Macrander, Terrence J. Jach
We discuss the possibilities for using Kirkpatrick-Baez (K-B) multilayer elements to directly image the fluorescence distribution from a specimen under x-ray illumination. X-ray fluorescence would be collected by K-B elements close in contrast to the use

Culture Conflicts in Software Engineering Technology Transfer

June 30, 1998
Author(s)
M V. Zelkowitz, D Wallace, D W. Binkley
Although the need to transition new technology to improve the process of developing quality software products is well understood, the computer software industry has done a poor job of carrying out that need. All toooften new software technology is touted

Metric Models for Random Graphs

June 30, 1998
Author(s)
D L. Banks, G Constantine
Many problems entail the analysis of data that are independent and identically distributed random graphs. Useful inference requires flexible probability models for such random graphs; these models should have interpretable location and scale parameters

Infrared Diffuse Reflectance Instrumentation and Standards at NIST

June 29, 1998
Author(s)
Leonard M. Hanssen, Simon G. Kaplan
A spectrophotometer system for spectral characterization of materials in the infrared has been built around a bench-top Fourier transform (FTIR) instrument. Its capabilities include the measurement of directional-hemispherical reflectance from 1 *m to 18

Effect of P o2 and Ag on the Phase Formation of the Pb-2223 Superconductor

June 25, 1998
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood
The chemical reactions and the compositional characteristics of liquids which lead to the phase formation of the Pb-2223 ((Bi,Pb):Sr:Ca:Cu:O) superconductor have been studied for a precursor composition of Bi 1.8Pb o.4Sr 2Ca 2.2Cu 3O x. The combined

Issues in Evaluating Face Recognition Algorithms

June 22, 1998
Author(s)
P J. Phillips, R. McCabe, R Chellappa
Biometric-based identification and verification systems are poised to become a key technology, with applications including controlling access to buildings and computers, reducing fraudulent transactions in electronic commerce, and discouraging illegal
Displaying 52626 - 52650 of 74505
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