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Displaying 51726 - 51750 of 73697

A Reference Quality Equation of State for Nitrogen

July 1, 1998
Author(s)
R Span, Eric Lemmon, R. T. Jacobsen, Wolfgang Wagner
A new formulation describing the thermodynamic properties of nitrogen has been developed. New data sets are now available which have been used to improve the representation of the 0-0-T surface of gaseous, liquid and supercritical nitrogen, including the

A System to Measure Current Transducer Performance

July 1, 1998
Author(s)
Bryan C. Waltrip, Thomas L. Nelson
A special purpose ac current transducer measurement system capable of intercomparing transducers with ac output voltage ratios from 1:1 to 50:1 has been developed to extend the range and accuracy of current transformer, current shunt, and mutual inductor

An Accurate Measurement of Planck's Constant

July 1, 1998
Author(s)
Edwin R. Williams, Richard L. Steiner, David B. Newell
Using a moving coil watt balance, electric power measured in terms of the Josephson and quantum Hall effects is compared with mechanical power measured in terms of the meter, kilogram and second, we find the Planck constant h = 6.62606891(58) x 10 -34 Js

An Object-Oriented Representation for Product and Design Processes

July 1, 1998
Author(s)
Ram D. Sriram, S Gorti, A Gupta, Gerard Kim, A Wong
We report on the development of a knowledge representation model, which is based on the SHARED object model reported in [33,34]. Our current model is implemented as a layered scheme, that incorporates both an evolving artifact and its associated design

Assessment of Color Measurement Systems Using Interference Filters

July 1, 1998
Author(s)
Paul A. Boynton, Eric Kelley
Spectroradiometers and tristimulus colorimeters are used in display measurements to measure color in one of several color space coordinate systems. How well these instruments can measure the color coordinates can be simply checked by using interference

Calibration of Dissipation Factor Standards

July 1, 1998
Author(s)
Eric D. Simmon, Gerald FitzPatrick, O. Petersons
Dissipation factor (D) standards obtained by connecting a shielded three-terminal capacitor in series with a shielded resistor have been developed for calibration purposes. An analysis of these DF Standards, including precautions in their construction and

Capacitance and Dissipation Factor Measurements from 1 kHz to 10 MHz

July 1, 1998
Author(s)
Andrew D. Koffman, Bryan C. Waltrip, Nile M. Oldham, S. Avramov
A measurement technique developed by K. Yokoi et al. At Hewlett-Packard Japan, Ltd. Has been duplicated and evaluated at NIST to characterize four-terminal pair capacitors. The technique is based on an accurate three-terminal measurement made at 1 kHz

Characterization of Planarity of Polymer Thin Films on Rough Surfaces

July 1, 1998
Author(s)
Wen-Li Wu, William E. Wallace
Angle-dependent total reflection x-ray fluorescence (TRXF) is used to characterize the surface roughness or the extent of planarization of a thin polymer coating on a stainless steel surface with significant roughness. The objective of this work is to

Charge Offset and Noise in SET Transistors

July 1, 1998
Author(s)
Neil M. Zimmerman, J. L. Cobb
We report on several previous and ongoing investigations into the source of, and the amelioration of, the charge offset noise in SET (single-electron tunneling) transistors, made of Al/AlOx/Al tunnel junctions. Previous work has shown that significant time

Class A Fire Suppression Experiments (NISTIR 6191)

July 1, 1998
Author(s)
Daniel M. Madrzykowski, D W. Stroup
This section reports on two studies conducted at NIST on the suppression of wood crib fires and tire fires. An overview of previous research on the use of water based fire suppression agents on wood cribs and tires is provided. A burning pile of rubble or

Class D Fire Suppression Experiments.

July 1, 1998
Author(s)
R L. Vettori
To investigate the effectiveness of water based extinguishing agents on non alkali Class D fires, two series of fire suppression experiments were conducted. The first experimental series was conducted by Underwriters Laboratory at the facility located in
Displaying 51726 - 51750 of 73697
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