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Displaying 52126 - 52150 of 74191

Elastic and Inelastic Collisions of Cold Spin-Polarized 133 Cs Atoms

August 1, 1998
Author(s)
P J. Leo, Eite Tiesinga, Paul S. Julienne, D K. Walter, S Kadlecek, T G. Walker
We present theoretical calculations of thermally averaged elastic cross sections and spin-relaxation rate coefficients in the temperature range 0.1 to 300 K for Magnetically trapped doubly polarized cesium atoms. The calculations reproduce the recent

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
Displaying 52126 - 52150 of 74191
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