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You searched on: Author: michael moldover

Displaying records 11 to 20 of 113 records.
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11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. Calibration of a Long-Wavelength Acoustic Flowmeter Using a Lumped Impedance Acoustic Model
Published: 8/26/2013
Authors: Lee James Gorny, Keith A Gillis, Michael R Moldover
Abstract: As a part of NIST‰s program to standardize measurements of greenhouse gas emissions, we are developing long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurement of flue gas flows, for example, from coal-burning power plants. A L ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914137

20. The Effect of Turbulence on a Multi-Hole Pitot Calibration
Published: 6/10/2013
Authors: Christopher J. Crowley, Iosif I Shinder, Michael R Moldover
Abstract: Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid‰s velocity, and the pitch and yaw angles. When calibrating a commercially-manufactured multi-hole Pitot tube in NIST‰s low-turbul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912762



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