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You searched on: Author: michael moldover

Displaying records 31 to 40 of 116 records.
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31. Calibrations of Multi-Hole Pitot Tubes Depend on Tubulence
Published: 3/19/2012
Authors: Iosif I Shinder, Christopher J. Crowley, Michael R Moldover
Abstract: NIST is developing techniques to calibrate 2- and 3-dimensional anemometer systems (such as multi-hole pitot tubes) with a resolution of 0.3 %. The pitch and yaw response of multi-hole pitot tubes is complicated; therefore, calibrations require hund ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910815

32. Semiclassical fifth virial coefficients for improved ab initio helium-­4 standards
Published: 2/15/2012
Authors: Katherine Shaul, Andrew Schultz, David A. Kofke, Michael R Moldover
Abstract: For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4 and B5 and the more accurate literature values of B2 and B3, we argue that the ab initio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910524

33. 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

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. 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



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