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Author: michael moldover

Displaying records 31 to 40 of 98 records.
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31. Shear Thinning Near the Critical Point of Xenon
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830987

32. Acoustic Thermometry Results From 271 K to 552 K
Published: 9/8/2007
Authors: Dean C Ripple, Gregory F Strouse, Michael R Moldover
Abstract: The NIST Acoustic Thermometer determines the thermodynamic temperature from measurements of ratios of the speed of sound of argon in a spherical cavity. We report recent results for T - T90 on 12 isotherms spanning the range 271 K to 552 K. (T is th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831005

33. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Published: 8/1/2007
Authors: E May, Robert F Berg, Michael R Moldover
Abstract: We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830996

34. The Polarizability of Helium and Gas Metrology
Published: 6/22/2007
Authors: James W Schmidt, R Gavioso, E May, Michael R Moldover
Abstract: Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability {I}A{/I}^d{epsilon}^ in the limit of zero density. We obtained ({I}A{/I}^d{epsilon},meas^ - {I}A{/I}^d{epsilon},theory^ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830993

35. Capacitors and Electromagnetic Resonators for Gas Metrology
Published: 5/1/2007
Authors: Michael R Moldover, James W Schmidt
Abstract: Gas-filled capacitors are being used as primary thermometers and they show promise as primary pressure standards and for measuring the Boltzmann constant. With these metrological applications in mind, we discuss the advantages and disadvantages of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830986

36. Bulk Viscosity, Thermoacoustic Boundary Layers, and Adsorption Near the Critical Point
Published: 9/8/2006
Authors: Keith A Gillis, Iosif I Shinder, Michael R Moldover
Abstract: We measured the resonance spectrum of an acoustic resonator filled with xenon near its critical temperature Tc. We reduced the effect of gravity on the xenon by convective stirring to achieve a temperature resolution of (T-Tc)/Tc 7 10-6. The data y ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830964

37. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902995

38. Transport Properties of Argon at Zero Density From Viscosity-Ratio Measurements
Published: 4/1/2006
Authors: E May, Michael R Moldover, Robert F Berg, John J. Hurly
Abstract: We determined the zero-density viscosity and thermal conductivity of argon with an uncertainty of only 0.039 % in the temperature range 200 K to 400 K. Our results will improve: (1) the argon-argon interatomic potential, (2) calculated boundary-laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830959

39. Acoustic Thermometry: New Results From 273 K to 77 K and Progress Towards 4 K
Published: 1/1/2006
Authors: Laurent Pitre, Michael R Moldover, Weston Leo Tew
Abstract: We used a quasi-spherical cavity as an acoustic and microwave resonator to measure the thermodynamic temperatures T of the triple points of mercury, argon, neon, and equilibrium hydrogen, and to measure the difference T - T90, in the range 7 K to 273 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830941

40. Relaxation Effects in Small Critical Nozzles
Published: 1/1/2006
Authors: Aaron N Johnson, C L Merkle, Michael R Moldover, John D Wright
Abstract: We computed the flow of four gases (He, N^d2^, CO^d2^, and SF^d^6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for {tau}^drelax^, a species-dependent relaxation time that c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830846



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