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NIST Authors in Bold

Displaying 51651 - 51675 of 73697

Hardness Testing of Ceramics

August 1, 1998
Author(s)
George D. Quinn
An overview of hardness testing of ceramics is presented. Conventional test methods are discussed, particularly with respect to major sources of experimental error and standardization. Two NIST Standard Reference Materials (SRMs) are highlighted. Emerging

High Heat Flux Sensors Calibration Using Blackbody Radiation

August 1, 1998
Author(s)
A V. Murthy, Benjamin K. Tsai, Robert D. Saunders
This paper deals with the radiative calibration aspects of high heat flux sensors using blackbody radiation. Several heat flux sensors were calibrated up to 50kW/m 2 in the last two years using a 25 - mm diameter aperture variable temperature blackbody and

Information Technology: The Sixth Text Retrieval Conference (TREC-6)

August 1, 1998
Author(s)
Ellen M. Voorhees, Donna K. Harman
This paper provides an overview of the Sixth Text REtrieval Conference (TREC-6) held in Gaithersburg, Maryland, November 19-21, 1997. TREC-6 is the latest in a series of workshops designed to foster research in text retrieval. The paper describes the tasks

Low-Temperature Elastic Constants of Polycrystalline Indium

August 1, 1998
Author(s)
Sudook A. Kim, H M. Ledbetter
Using an ultrasonic pulse-echo method, we measured the elastic constants of polycrystalline indium from 300 K to 5K. All elastic constants showed regular temperature behavior as predicted by an Einstein-oscillator model. The shear and Young moduli showed

Matching Pursuit Filters Applied to Face Identification

August 1, 1998
Author(s)
P J. Phillips
We present a face identification algorithm that automatically processes an unknown image by locating and identifying the face. The heart of the algorithm is the use of pursuits filters. A matching pursuit filter is an adapted wavelet expansion, where the

NIST Atomic and Molecular Databases on the World Wide Web

August 1, 1998
Author(s)
Robert A. Dragoset, Peter J. Mohr, Karen J. Olsen, Edward B. Saloman, G G. Wiersma, D Zucker
The Physics Laboratory of the National Institute of Standards and Technology is using the world wide web to disseminate the physical reference data it has been producing and/or evaluating. Web databases have been developed, each with an interface specially

NIST Atomic Spectra Database (1998)

August 1, 1998
Author(s)
Yuri Ralchenko
We put Version 1 of this database online as an interactive Web server in 1995. Our first version has data on atomic energy levels for some 500 spectra, transition probability data for spectra of the iron-group elements, and wavelength data for spectra of a

Obstacle Detection and Mapping System

August 1, 1998
Author(s)
H Tsai-Hong, Steven Legowik, M Nashman
This paper discusses and evaluates an obstacle detection algorithm developed at NIST in support of the DEMO III Unmanned Ground Vehicle (UGV) program. The algorithm is a hybrid of grid-based and sensor-based obstacle detection and mapping techniques and is

On the Validity of the Poisson Hypothesis for Low-Level Counting; Investigation of the Distributional Characteristics of Background Radiation with the NIST Individual Pulse Counting System

August 1, 1998
Author(s)
George A. Klouda, Lloyd A. Currie, E M. Eijgenhuijsen
Does radioactive decay follow the Poisson distribution?--a fundamental question to which the theoretical answer seems to be, Yes. On the practical side, the answer to this question impacts the best achievable precision in well-controlled counting

Plane Wave Integral Representation for Fields in Reverberation Chambers

August 1, 1998
Author(s)
David A. Hill
A plane wave integral representation is presented for well-stirred fields in a reverberation chamber. The representation automatically satisfies Maxwell's equations in a source-free region and the statistical properties of the fields are introduced through
Displaying 51651 - 51675 of 73697
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