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You searched on: Author: michael moldover

Displaying records 31 to 40 of 113 records.
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31. Progress toward redetermining the Boltzmann constant with a fixed-path-length cylindrical resonator
Published: 5/21/2011
Authors: Jintao Zhang, H. Lin, X.J. Feng, J.P. Sun, Keith A Gillis, Michael R Moldover, Y.Y. Duan
Abstract: We used a single, fixed-path-length cylindrical-cavity resonator to measure {I}c{/I}^d0^ = (307.8252 {+ or -} 0.0012) m{bullet}s^u−1^, the zero-density limit of the speed of sound in pure argon at the temperature of the triple point of water. ...

32. Present Estimates of the Differences Between Thermodynamic Temperatures and the ITS-90
Published: 1/29/2011
Authors: Joachim Fischer, M. DePodesta, K. D. Hill, Michael R Moldover, Laurent Pitre, R. Rusby, Peter Steur, Osamu Tamura, R. White, L. Wolber
Abstract: In 2005, the Consultative Committee for Thermometry (CCT) recommended the creation of a Mise en pratique for the definition of the kelvin and envisioned that future versions of the Mise en pratique would recommend values of the differences between ...

33. 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 ...

34. BOOK REVIEW Critical Behavior of Non-Ideal Systems (English Edition, 2008) D. Yu. Ivanov
Published: 8/30/2010
Author: Michael R Moldover
Abstract: None

35. Using Ab Initio "Data" to Accurately Determine the Fourth Density Virial Coefficient of Helium
Published: 6/25/2010
Authors: Michael R Moldover, Mark O McLinden
Abstract: We combine accurate ab initio calculations of the second and third density virial coefficients, B(T) and C(T), of 4He with measurements of its pressure-density-temperature behavior to determine the fourth density viral coefficient D(T). The measureme ...

36. Cylindrical Acoustic Resonator for the Re-determination of the Boltzmann Constant
Published: 6/1/2010
Authors: J.T. Zhang, H. Lin, X.J. Feng, Keith A Gillis, Michael R Moldover
Abstract: We describe progress towards re-determining the Boltzmann constant {I}k{/I}^dB^ using two fixed-path, gas-filled, cylindrical, acoustic cavity resonators. The longitudinal acoustic resonance modes of a cylindrical cavity have lower quality factors {I ...

37. Feasibility of an Accurate Dynamic Standard for Water Flow
Published: 6/1/2010
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We used NIST's primary water flow standard to study the feasibility of accurately determining mass flow rates {I}m{/I}^ddot^ of water "dynamically," that is from the time derivative of the weight {I}W{/I} of the collection tank: {I}m{/I ...

38. Improved NIST Airspeed Calibration Facility
Published: 3/23/2010
Authors: Iosif I Shinder, James M Hall, Michael R Moldover
Abstract: The National Institute of Standards and Technology (NIST) uses a laser Doppler anemometer (LDA) as a working standard for airspeed calibrations in the range 0.15 m/s to 75 m/s (0.34 to 168 miles/hour). We report improved procedures for calibrating th ...

39. Optimizing Acoustic Measurements of the Boltzmann Constant
Published: 11/22/2009
Author: Michael R Moldover
Abstract: We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant {I}R{/I} using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophys ...

40. Perturbations from Ducts on the Modes of Acoustic Thermometers
Series: Journal of Research (NIST JRES)
Report Number: 114
Published: 9/1/2009
Authors: Keith A Gillis, Michael R Moldover, Hong Lin
Abstract: We examine the perturbations of the modes of an acoustic thermometer caused by circular ducts used either for gas flow or as acoustic waveguides coupled to remote transducers. We calculate the acoustic admittance of circular ducts using a model b ...

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