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1. Test of a virtual cylindrical acoustic resonator for determining the Boltzmann constant
Published: 8/19/2015
Authors: XiaoJuan Feng, Hong Lin, Keith A Gillis, Michael R Moldover, Jintao Zhang
Abstract: We report progress in determining the Boltzmann constant {I}k{/I}^dB^ using a virtual acoustic resonator derived by combining the measured frequencies of the longitudinal acoustic modes of two argon-filled, cylindrical, cavity resonators in such a wa ...

2. Measuring collected gas with microwave and acoustic resonances
Published: 4/23/2015
Authors: Keith A Gillis, James W Schmidt, Michael R Moldover, James B. Mehl
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I} of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel ("tank") with a relative standard uncertainty of {I}u{ ...

3. NIST‰s New 3D Airspeed Calibration Rig, Addresses Turbulent Flow Measurement Challenges
Published: 4/14/2015
Authors: Iosif I Shinder, Vladimir Khromchenko, Michael R Moldover
Abstract: Outdoor air flows and flue-gas flows in large conduits and large stacks have significant swirl and turbulence. Accurate measurements of such complex flows are needed by weather services and diverse industries (e.g. automotive, aircraft, wind-power, ...

4. Thermal Effects on Critical Flow Venturis
Published: 4/14/2015
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Woong Kang, Liang Zhang
Abstract: Critical flow venturis (CFVs) are widely used as working and transfer standards for gas flow measurement because of their long-term calibration stability (< 0.06 %) and well developed physical model. At Reynolds numbers {I}Re{/I} < 2.5 {multiply} 10^ ...

5. "Weighing" a Gas With Microwave and Acoustic Resonances
Published: 3/24/2015
Authors: Keith A Gillis, James B. Mehl, James W Schmidt, Michael R Moldover
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I}of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel ("tank") with a relative uncertainty of {I}u{/I}^dr^({I ...

6. Microwave Determination of the Volume of a Pressure Vessel
Published: 12/9/2014
Authors: Michael R Moldover, James W Schmidt, Keith A Gillis, James B. Mehl, John D Wright
Abstract: Using microwave techniques that are scalable to very large volumes, we measured the interior volume of a 0.3 m^u3^, commercially-manufactured, pressure vessel with an uncertainty of 0.05 %, as confirmed by independent, more-accurate, gas-expansion me ...

7. Improvements to NIST‰s Air Speed Calibration Service
Published: 12/8/2014
Authors: Iosif I Shinder, Michael R Moldover, Christopher J. Crowley, Bernard J Filla
Abstract: We discuss five significant improvements to the Air Speed Calibration Service conducted by the National Institute of Standards and Technology (NIST): 1. Reduced-uncertainty calibration of the secondary standard [Laser Doppler Anemometer, (LDA)] usin ...

8. Acoustic Techniques for Measuring Transport Properties of Gases
Published: 5/22/2014
Authors: Keith A Gillis, Michael R Moldover
Abstract: We describe the principles, techniques, and performance of acoustic resonators used to measure the shear viscosity, the thermal conductivity, and the bulk viscosity in gases. We developed the Greenspan acoustic viscometer at NIST, where colleagues us ...

9. Viscosity-ratio measurements with capillary viscometers
Published: 5/20/2014
Authors: Robert F Berg, Eric F. May, Michael R Moldover
Abstract: Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium resulting from ab initio calculations. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic thermo ...

Published: 1/16/2014
Authors: Michael R Moldover, Roberto M Gavioso, James B Mehl, Laurent Pitre, Michael de Podesta, Jintao Zhang
Abstract: We review the principles, techniques and results from primary acoustic gas thermometry (AGT). Since the establishment of ITS-90, the International Temperature Scale of 1990, spherical and quasi-spherical cavity resonators have been used to realize pr ...

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