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You searched on: Author: michael moldover

Displaying records 21 to 30 of 105 records.
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21. Improved First-Principles Calculation of the Third Virial Coefficient of Helium
Series: Journal of Research (NIST JRES)
Published: 8/31/2011
Authors: Giovanni Garberoglio, Michael R Moldover, Allan H Harvey
Abstract: We employ state-of-the-art pair and three-body potentials for helium to calculate its third density virial coefficient C(T) with uncertainties much smaller than those of the best experimental results, and approximately one-fourth the uncertainty of o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907954

22. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907610

23. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905075

24. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906313

25. BOOK REVIEW Critical Behavior of Non-Ideal Systems (English Edition, 2008) D. Yu. Ivanov
Published: 8/30/2010
Author: Michael R Moldover
Abstract: None
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906199

26. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904371

27. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905511

28. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832344

29. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904871

30. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902117



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