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NIST Authors in Bold

Displaying 48151 - 48175 of 73829

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

Electron-Impact Total Ionization Cross Sections of Molecular Ions

March 1, 2000
Author(s)
Yong Sik Kim, Karl Irikura, M A. Ali
The Binary-Encounter-Bethe (BEB) model for electron-impact total ionization cross sections of neutral molecules has been modified for molecular ions. The total ionization cross section for H + 2, N + 2, CD +, and CO+ from the modified BEB formula are

Evaluated Kinetic and Photochemical Data for Atmospheric Chemistry: Supplement VIII, Halogen Species - IUPAC Subcommittee on Gas Kinetic Data Evaluation for Atmospheric Chemistry

March 1, 2000
Author(s)
R Atkinson, D L. Baulch, R A. Cox, Robert F. Hampson, J A. Kerr, M J. Rossi, J Troe
This paper updates and extends part of the previous data base of critical evaluations of the kinetics and photochemistry of gas-phase chemical reaction of neutral species involved in atmospheric chemistry [J. Phys. Chem. Ref. Data 9, 295 (1980); 11, 327

Excited States at Surfaces: Fano Profiles in STM Spectroscopy of Adsorbates

March 1, 2000
Author(s)
John William Gadzuk, M Plihal
The Fano-Anderson model for a discrete state embedded within a continuum is revisited within the context of excitation and decay processes which lead to some manifestations of Fano lineshape profiles. The phenomenon of resonance tunneling between an STM

Experimental Data for the Viscosity and Thermal Conductivity of Water and Steam

March 1, 2000
Author(s)
Marc J. Assael, E Bekou, D Giakoumakis, Daniel G. Friend, M A. Killeen, J Millat, A Nagashima
As part of a joint project between the International Association for the Properties of Water and Steam and the Subcommittee on Transport Properties of the International Union of Pure and Applied Chemistry Commission 1.2 on Thermodynamics, all available and

Failure Dynamics of the IGBT During Turn-Off for Unclamped Inductive Loading Conditions

March 1, 2000
Author(s)
Chien-Chung Shen, Allen R. Hefner Jr., David W. Berning, J B. Bernstein
The internal failure dynamics of the Insulated Gate Bipolar Transistor (IBGT) for unclamped inductive switching (UIS) conditions are studied using simulations and measurements. The UIS measurements are made using a unique, automated nondestructive Reverse
Displaying 48151 - 48175 of 73829
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