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Displaying 48151 - 48175 of 73839

Cancellation of Laser Dither Modulation From Optical Frequency Standards

March 1, 2000
Author(s)
M S. Taubman, J L. Hall
We demonstrate the removal of the dither modulation from an iodine-stabilized He-Ne laser by using a frequency-modulated acousto-optic modulator and feed-forward techniques. This procedure reduces the linewidth of the beat between this laser and a flywheel

Cobalt-Corrin Catalyzed Photoreduction of CO 2

March 1, 2000
Author(s)
J Grodkowski, Pedatsur Neta
A first attempt to use cobalt corrins (B 12) as homogeneous catalysts for photoreduction of CO 2 to CO and formic acid demonstrates that the corrins act as catalysts for this process and that they are much more efficient than cobalt porphyrins.

Contact Damage in Porcelain/Pd-Alloy Bilayers

March 1, 2000
Author(s)
H Zhao, X Z. Hu, M T. Bush, Brian R. Lawn
An analysis is made of contact damage in brittle coatings on metal substrates, using as a case study a dental porcelain coating of thickness between 0.1 and 1 mm fused onto a Pd alloy base, with spherical indenter of radii 2.38 and 3.98 mm. At large

Design and Testing of NFRad - A New Noise Measurement System

March 1, 2000
Author(s)
Chriss A. Grosvenor, James P. Randa, Robert L. Billinger
The NIST Noise project has constructed and tested a new, automated, coaxial (GPC-7) radiometer for the measurement of noise sources in the 8-12 GHz frequency band. It is an isolated, total-power radiometer that relies on lookup tables for relevant

Determination of the Molecular Mass Distribution of Narrow Polydispersity Polystyrene by MALDI-TOF-MS: Interlaboratory Comparison

March 1, 2000
Author(s)
Kathleen M. Flynn, S Wetzel, William E. Wallace, William R. Blair, R J. Goldschmidt, David L. VanderHart, B M. Fanconi
NIST has sponsored a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) interlaboratory comparison using a well-characterized polystyrene to determine the reproducibility in determining the molecular mass

Development of Oxygen Scavenger Additives for Future Jet Fuels. A Role for Electron-Transfer-Initiated Oxygenation (ETIO) of 1,2,5-Trimethylpyrrole?

March 1, 2000
Author(s)
B Beaver, V Sharief, Y Teng, R DeMunshi, J P. Guo, E Katondo, D Gallagher, David M. Bunk, J Grodkowski, Pedatsur Neta
Model autoxidative, radiolytic and product studies are presented which explore the potential of 1,2,5-trimethylpyrrole (TMP) as an oxygen scavenger additive for future jet fuels. The results are consistent with a mechanism for the initial stages of the

Distortion-Tolerant Filter for Elastic-Distorted Fingerprint Matching

March 1, 2000
Author(s)
Craig I. Watson, Patrick J. Grother, D P. Casasent
This paper gives results for using distortion tolerant filters to improve performance of fingerprint correlation matching. Three types of distortion tolerant filters were tested: summation, weighted, and MINACE. A set of 55 fingers were used from NIST
Displaying 48151 - 48175 of 73839
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