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You searched on: Author: michael moldover

Displaying records 61 to 70 of 109 records.
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61. Comment On 'General Principles for the Definition of the Base Units in the SI'
Published: 10/1/2003
Authors: Michael R Moldover, Dean C Ripple
Abstract: Recently, Kose et al. proposed general principles that should guide any future discussions regarding the redefinition of the SI base units and they illustrated their principles with an example of a revised SI. Part of their example (redefinition o ...

62. Progress in Primary Acoustic Thermometry at NIST: 273 K to 505 K
Published: 9/1/2003
Authors: Gregory F Strouse, Dana R Defibaugh, Michael R Moldover, Dean C Ripple
Abstract: The NIST Acoustic Thermometer determines the thermodynamic temperature by measuring the speed of sound of argon in a spherical cavity. We obtained the thermodynamic temperature of three fixed points on the Interna-tionalTemperature Scale of 1990: the ...

63. Techniques for Primary Acoustic Thermometry to 800 K
Published: 9/1/2003
Authors: Dean C Ripple, Dana R Defibaugh, Michael R Moldover, Gregory F Strouse
Abstract: The NIST Primary Acoustic Thermometer will measure the difference between the International TemperatureScale of 1990 and the Kelvin Thermodynamic Scale throughout the range 273 K to 800 K with uncertainties of only afew millikelvins. The acoustic the ...

64. Temperature Characterization in the Collection Tank of the NIST 26 m(3) PVTt Gas Flow Standard
Published: 9/1/2003
Authors: Aaron N Johnson, John D Wright, Michael R Moldover, Pedro I Espina
Abstract: Gas temperature gradients created during the filling stage of a PVTt (Pressure-Volume-Temperature-time) calibration cycle, and those imposed by inhomogeneous room conditions, lead to uncertainties in the average gas temperature in the collection tank ...

65. Theory of the Greenspan Viscometer
Published: 7/1/2003
Authors: Keith A Gillis, J B. Mehl, Michael R Moldover
Abstract: We present a detailed acoustic model of the Greenspan acoustic viscometer, a practical instrument for accurately measuring the viscosity eta of gases. As conceived by Greenspan, the viscometer is a Helmholtz resonator composed of two chambers coupl ...

66. Relative Permittivity and Refractive Index
Published: 3/28/2003
Authors: Michael R Moldover, K N Marsh, J M Barthel, R Buchner
Abstract: Measurements of the relative electric permittivity (dielectric constant or relative permittivity) e(p,T) and refractive index of fluids n(p,T) as a function of the pressure and the temperature can be used to determine a wide range of thermodynamic pr ...

67. Dielectric Permittivity of Eight Gases Measured with Cross Capacitors
Published: 3/1/2003
Authors: James W Schmidt, Michael R Moldover
Abstract: A 4-ring, toroidal cross capacitor was used to measure accurately the relative dielectric permittivity {epsilon}(p,T) of He, Ar, N^d2^, O^d2^, CH^d4^, C^d2^H^d6^, C^d3^H^d8^, and CO^d2^. ({epsilon} is often called the dielectric constant. ) The dat ...

68. Design and Uncertainty Analysis for a PVTt Gas Flow Standard
Series: Journal of Research (NIST JRES)
Published: 2/1/2003
Authors: John D Wright, Aaron N Johnson, Michael R Moldover
Abstract: A new pressure, volume, temperature, and time (PVTt) primary gas flow standard has been constructed at the National Institute of Standards and Technology with an expanded uncertainty of between 0.02 % and 0.05 % (k = 2). The standard covers a flow ra ...

69. Acoustic Measurements in Gases, Chapter 10
Published: 9/15/2001
Authors: Michael R Moldover, Keith A Gillis, John J. Hurly, J B. Mehl, J Wilhelm
Abstract: Cylindrical acoustic resonators developed at the National 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 ...

70. Accurate Measurements of Thermodynamic and Transport Properties of Industrial Gases with Acoustic Resonators.
Published: 9/2/2001
Authors: Keith A Gillis, John J. Hurly, Michael R Moldover
Abstract: Acoustic resonators have been developed at NIST as tools to measure the thermodynamic and transport properties of gases. High Q cylindrical acoustic resonators are routinely used to measure the speed of sound in gases with uncertainties of 0.01% or l ...

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