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You searched on: Author: michael moldover Sorted by: title

Displaying records 1 to 10 of 116 records.
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1. 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 ...

2. "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 ...

3. A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator
Published: 5/2/2006
Authors: Peter H. Huang, Dean C Ripple, Michael R Moldover, Gregory E Scace
Abstract: We developed a stable reference hygrometer suitable for operation at temperatures above ambient that has a robust design, inherent stability, and a well-understood theory of measurement. This hygrometer uses a reentrant, radio-frequency, cavity reson ...

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 ...

5. Ab Initio Values of the Thermophysical Properties of Helium as Standards
Series: Journal of Research (NIST JRES)
Published: 9/1/2000
Authors: John J. Hurly, Michael R Moldover
Abstract: Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these recent ab initio results with earlier published results to obtain a he ...

6. Accurate Measurements of Process Gas Flow with Laminar Flow Meters
Published: 10/15/2010
Authors: Thiago Cobu, Robert F Berg, John D Wright, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST‰s primary flow standards and a physical model. Without addi ...

7. 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 ...

8. Accurately Measuring Unsteady Water Flows Using A Dynamic Standard
Published: 4/1/2009
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We recently presented and tested a model for a dynamic gravimetric standard for steady water flows. In the range 10 kg/s to 60 kg/s, the difference between the dynamic standard and NIST's static primary standard was 0.015 % with a standard deviat ...

9. 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 ...

10. 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 ...

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