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You searched on: Author: michael moldover

Displaying records 61 to 70 of 113 records.
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61. Gas Flowmeter Calibrations with the 34 L and 677 L PVTt Standards
Series: Special Publication (NIST SP)
Published: 6/23/2004
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Gina M Kline
Abstract: This document provides a description of the 34 L and 677 L pressure, volume, temperature, and time (PVTt) primary gas flow standards operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. These facilities are used to ...

62. Designing Quasi-Spherical Resonators for Acoustic Thermometry
Published: 6/1/2004
Authors: J B. Mehl, Michael R Moldover, J Pitre
Abstract: We describe a quasi-spherical, noble-gas-filled cavity designed to determine the thermodynamic temperature of the gas from measurements of the frequencies and the half-widths of microwave and acoustic resonances in the cavity. The quasi-spherical sh ...

63. The Viscosity of Seven Gases Measured with a Greenspan Viscometer
Published: 11/1/2003
Authors: John J. Hurly, Keith A Gillis, J B. Mehl, Michael R Moldover
Abstract: We determined the viscosity of seven gases (Ar, CH4, C3H8, N2, SF6, CF4, C2F6) by interpreting frequency-response data from a Greenspan acoustic viscometer with a detailed model developed by Gillis, Mehl, and Moldover. The model contains a paramete ...

64. Volumetric Gas Flow Standard with Uncertainty of 0.02% to 0.05%
Published: 11/1/2003
Authors: John D Wright, Michael R Moldover, Aaron N Johnson, A Mizuno
Abstract: A new pressure, volume, temperature, and time (PVTt) primary gas flow standard for calibrating flowmeters has an expanded uncertainty (k = 2) of between 0.02% and 0.05%. The standard diverts a steady flow into a collection tank of known volume durin ...

65. 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 ...

66. 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 ...

67. 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 ...

68. 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 ...

69. 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 ...

70. 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 ...

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