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You searched on: Author: michael moldover

Displaying records 71 to 80 of 109 records.
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71. Reference Values of the Dielectric Constant of Natural Gas Components Determined with a Cross Capacitor
Published: 5/1/2001
Authors: Michael R Moldover, T J. Buckley
Abstract: We used a novel toroidal cross capacitor to measure accurately the dielectric polarizability e(p) (i.e., the dielectric constant) of helium, argon, nitrogen, methane, and carbon dioxide at T = 50 degrees C. The data extend up to 7 MPa (5 MPa for CO ...

72. Chapter 12, Acoustic Measurements in Gases: Applications to Thermodynamic Properties, Transport Properties, and the Temperature Scale
Published: 1/1/2001
Authors: Michael R Moldover, Keith A Gillis, John J. Hurly, J B. Mehl, J Wilhelm
Abstract: Cylindrical acoustic resonators developed at Niational Institute of Standards and Technology (NIST) are routinely used to measure the speed of sound in gases with uncertainties of 0.01%, or less. The pressure dependence of the data is fitted with mo ...

73. The Kelvin and Temperature Measurements
Series: Journal of Research (NIST JRES)
Published: 1/1/2001
Authors: Billy Wilson Mangum, G T. Furukawa, Kenneth Gruber Kreider, Christopher W Meyer, Dean C Ripple, Gregory F Strouse, Weston Leo Tew, Robert D. Saunders, Bettye C Johnson, Howard W Yoon, Michael R Moldover, Charles E Gibson
Abstract: The International Temperature Scale of 1990 (ITS90) is defined from 0.65 K upwards to the highest temperature measurable by spectral radiation thermometry, the radiation thermometry being based on the Planck radiation law. Part I of this paper descr ...

74. The Effect of Vibrational Relaxation of the Discharge Coefficient of Critical Flow Venturis
Published: 12/1/2000
Authors: Aaron N Johnson, John D Wright, Shin-ichi Nakao, C L Merkle, Michael R Moldover
Abstract: This paper identifies a new mechanism that can affect the discharge coefficient of critical nozzle flows. Specifically, vibrational relaxation effects are demonstrated to significantly influence the discharge coefficient of selected gases in critical ...

75. 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 ...

76. 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 ...

77. 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, ...

78. 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 ...

79. 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

80. 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

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