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Displaying 50576 - 50600 of 74176

4-D/RCS Reference Model Architecture for Unmanned Ground Vehicles

April 1, 1999
Author(s)
James S. Albus
4-D/RCS is the reference model architecture currently being developed for the Demo III Experimental Unmanned Vehicle program. 4-D/RCS integrates the NIST (National Institute of Standards and Technology) RCS (Real-time Control System) with the German

A Result from the NIST Watt Balance and an Analysis of Uncertainties

April 1, 1999
Author(s)
Richard L. Steiner, David B. Newell, Edwin R. Williams
An improved determination of the ratio of power, measured in terms of the Josephson and quantum Hall effects, and also the meter, kilogram, and second, has been completed. The result is expressed as: W 90/W = 1 + (8187) x 10 -9. This is an order of

A Survey of Construction Metrology Options for the AEC Industry

April 1, 1999
Author(s)
C Lindfors, P C. Chang, William C. Stone
Techniques for measuring distances, relative heights, and angles have improved significantly during the last decades. Some of these techniques can be used in the architecture, engineering, and Construction industry to improve the precision of measurements

Absolute Frequency Atlas of Molecular I 2 Lines at 532 NM

April 1, 1999
Author(s)
Jun Ye, Lennart Robertsson, S Picard, L -. Ma, John L. Hall
With the aid of two iodine spectrometers, we report for the first time the measurement of the hyperfine splittings of the P(54) 32-0 and R(57)32-0 transitions near 532 nm. Within the tuning range of the frequency-doubled ND:YAG laser, modulation transfer

An Argument for Using Coarse Cements in High-Performance Concretes

April 1, 1999
Author(s)
Dale P. Bentz, C J. Hacker
The NIST cement hydration microstructural model and experimental studies are used to investigate the effects of particle size distribution and water-to-cement ratio on hydration kinetics. Cement hydration is limited by the availability of water at the

An Enriched 40 K Source for Fermionic Atom Studies

April 1, 1999
Author(s)
B. L. DeMarco, H Rohner, Deborah S. Jin
We have developed a novel, enriched potassium source for use in trapping and cooling of the fermionic isotope 40K. The source is clean, easily controllable, and consistent with high vacuum applications. With this enriched source, we are able to collect 10

Calibration of Dissipation Factor Standards

April 1, 1999
Author(s)
Eric D. Simmon, Gerald FitzPatrick, O. Petersons
Working standards for dissipation factor (D) standards obtained by connecting a shielded three-terminal capacitor in series with a shielded precision resistor have been developed for calibration purposes. Precision conductance boxes have been built for use

Do We Need a Roadmap?

April 1, 1999
Author(s)
Herbert S. Bennett, Joseph G. Pellegrino, D. L. Rode, Thomas J. Shaffner, David G. Seiler
Displaying 50576 - 50600 of 74176
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