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You searched on: Author: michael moldover

Displaying records 11 to 20 of 115 records.
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11. "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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917698

12. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917302

13. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916169

14. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914841

15. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914155

16. ACOUSTIC GAS THERMOMETRY
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914033

17. Acoustic Gas Thermometry
Published: 1/16/2014
Authors: Michael R Moldover, Roberto M Gavioso, James B Mehl, Laurent Pitre, Michael de Podesta, Jintao Zhang
Abstract: Primary acoustic gas thermometry (AGT) exploits the simple relationship between the speed of sound in a dilute gas u and the thermodynamic temperature T of the gas. For monatomic gases such as argon and helium, u2 = (5/3) kT/m, in the limit of zero f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912986

18. Viscosity-ratio measurements with capillary viscometers
Published: 11/27/2013
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 calculated ab initio. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic gas thermometry and for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914936

19. IMPROVEMENTS TO NIST'S AIR SPEED CALIBRATION SERVICE
Published: 9/24/2013
Authors: Iosif I Shinder, Christopher J. Crowley, Bernard J Filla, Michael R Moldover
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 calibrations of the secondary standard [Laser Doppler Anemometer, (LDA)] us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914255

20. Improved Determination of the Boltzmann Constant using a Single, Fixed-Length Cylindrical Cavity
Published: 8/27/2013
Authors: Hong Lin, Keith A Gillis, XiaoJuan Feng, Michael R Moldover, J.P. Sun, J.T. Zhang, Y.Y. Duan
Abstract: We report improvements to our previous [Zhang et al., Intl. J. Thermophysics, 32, 1297 (2011)] determination of the Boltzmann constant kB using a single 80 mm-long cylindrical cavity. In this work, the shape of the gas-filled resonant cavity is clos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913803



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