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You searched on: Author: michael moldover

Displaying records 81 to 90 of 115 records.
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81. Ab Initio Values of the Thermophysical Properties of Helium as Standards
Series: Journal of Research (NIST JRES)
Published: 9/1/2000
Authors: John J. Hurly, Michael R Moldover
Abstract: Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these recent ab initio results with earlier published results to obtain a he ...

82. An Improved Greenspan Acoustic Viscometer
Published: 9/1/2000
Authors: J Wilhelm, Keith A Gillis, J B. Mehl, Michael R Moldover
Abstract: We improved the Greenspan acoustic viscometer (double Helmholtz resonator) to measure the viscosity of gases at temperatures from 250 K to 400 K and at pressures up to 3.4 MPa. In anticipation of handling corrosive gases, all wetted parts of the app ...

83. Toroidal Cross-Capacitor for Measuring the Dielectric Constant of Gases
Published: 7/1/2000
Authors: T J. Buckley, J O. Hamelin, Michael R Moldover
Abstract: We describe toroidal cross capacitors built to accurately measure the dielectric constant of gases. We tested the capacitors by measuring the dielectric polarizability of helium and argon at 7 and 50 degrees C at pressures up to 3 MPa. For helium, ...

84. Thermodynamic Properties of Sulfur Hexafluoride
Published: 5/1/2000
Authors: John J. Hurly, Dana R Defibaugh, Michael R Moldover
Abstract: We present new vapor phase speed-of-sound data u(P,T), new Burnett density-pressure-temperature data {rho}(P,T), and a few vapor pressure measurements for sulfur hexafluoride (SF^d6^). The speed-of-sound data spanned the temperature range 230 K {le ...

85. Primary Acoustic Thermometry for Use Up to 800 K
Published: 12/1/1999
Authors: Dean C Ripple, Dana R Defibaugh, Keith A Gillis, Michael R Moldover

86. Thermodynamic Temperatures of the Triple Points of Mercury and Gallium and in the Interval 217 to 303 K
Series: Journal of Research (NIST JRES)
Report Number: N/A
Published: 12/1/1999
Authors: Michael R Moldover, S J. Boyes, Christopher W Meyer, A R. Goodwin

87. Thermophysical Properties of Process Gases
Published: 11/1/1999
Authors: John J. Hurly, Michael R Moldover
Abstract: We measured the speed of sound in the process gases Cl^d2^, HBr, BCl^d3^, and in the surrogate gases SF^d6^, CF^d4^, and C^d2^F^d6^. The data range up to 475 K (200 C) and from 25 kPa to 1500 kPa (or to 80% of the vapor pressure for condensable gas ...

88. Frequency-Dependent Viscosity of Xenon Near the Critical Point
Published: 10/1/1999
Authors: Robert F Berg, Michael R Moldover, G A Zimmerli
Abstract: We used a novel, overdamped oscillator aboard the Space Shuttle to measure the viscosity {eta} of xenon near its critical density {rho}^dc^ and temperature T^dc^. In microgravity, useful data were obtained within 0.1 mK of T^dc^, corresponding to a ...

89. Electrostriction of Near-Critical SF^d6^ in Microgravity
Published: 6/1/1999
Authors: G A Zimmerli, R A Wilkinson, R A Ferrell, Michael R Moldover
Abstract: We used interferometry to measure the electric-field-induced (I.e., electrostrictive) increase of the density of sulfur hexafluoride near its critical point. The results at the temperatures T^dc^ + 5 mK, T^dc^ + 10 mK, and T^dc^ + 30 mK, with T^dc^ ...

90. Primary Acoustic Thermometer for Use Up to 800 K
Published: 4/1/1999
Authors: Dean C Ripple, Dana R Defibaugh, Keith A Gillis, Michael R Moldover
Abstract: Primary acoustic thermometers determine the thermodynamic temperature of a monatomic gas from measurements of the speed of sound in the gas. Here, we describe the design and construction of an acoustic thermometer designed to operate at temperatures ...

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