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You searched on: Author: michael moldover

Displaying records 71 to 80 of 115 records.
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71. Theory of the Greenspan Viscometer
Published: 7/1/2003
Authors: Keith A Gillis, J B. Mehl, Michael R Moldover
Abstract: We present a detailed acoustic model of the Greenspan acoustic viscometer, a practical instrument for accurately measuring the viscosity eta of gases. As conceived by Greenspan, the viscometer is a Helmholtz resonator composed of two chambers coupl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830812

72. Relative Permittivity and Refractive Index
Published: 3/28/2003
Authors: Michael R Moldover, K N Marsh, J M Barthel, R Buchner
Abstract: Measurements of the relative electric permittivity (dielectric constant or relative permittivity) e(p,T) and refractive index of fluids n(p,T) as a function of the pressure and the temperature can be used to determine a wide range of thermodynamic pr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830808

73. Dielectric Permittivity of Eight Gases Measured with Cross Capacitors
Published: 3/1/2003
Authors: James W Schmidt, Michael R Moldover
Abstract: A 4-ring, toroidal cross capacitor was used to measure accurately the relative dielectric permittivity {epsilon}(p,T) of He, Ar, N^d2^, O^d2^, CH^d4^, C^d2^H^d6^, C^d3^H^d8^, and CO^d2^. ({epsilon} is often called the dielectric constant. ) The dat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830802

74. Design and Uncertainty Analysis for a PVTt Gas Flow Standard
Series: Journal of Research (NIST JRES)
Published: 2/1/2003
Authors: John D Wright, Aaron N Johnson, Michael R Moldover
Abstract: A new pressure, volume, temperature, and time (PVTt) primary gas flow standard has been constructed at the National Institute of Standards and Technology with an expanded uncertainty of between 0.02 % and 0.05 % (k = 2). The standard covers a flow ra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830785

75. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830741

76. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830760

77. Reference Values of the Dielectric Constant of Natural Gas Components Determined with a Cross Capacitor
Published: 5/1/2001
Authors: Michael R Moldover, T J. Buckley
Abstract: We used a novel toroidal cross capacitor to measure accurately the dielectric polarizability e(p) (i.e., the dielectric constant) of helium, argon, nitrogen, methane, and carbon dioxide at T = 50 degrees C. The data extend up to 7 MPa (5 MPa for CO ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830701

78. Chapter 12, Acoustic Measurements in Gases: Applications to Thermodynamic Properties, Transport Properties, and the Temperature Scale
Published: 1/1/2001
Authors: Michael R Moldover, Keith A Gillis, John J. Hurly, J B. Mehl, J Wilhelm
Abstract: Cylindrical acoustic resonators developed at Niational 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 mo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830679

79. The Kelvin and Temperature Measurements
Series: Journal of Research (NIST JRES)
Published: 1/1/2001
Authors: Billy Wilson Mangum, G T. Furukawa, Kenneth Gruber Kreider, Christopher W Meyer, Dean C Ripple, Gregory F Strouse, Weston Leo Tew, Robert D. Saunders, Bettye C Johnson, Howard W Yoon, Michael R Moldover, Charles E Gibson
Abstract: The International Temperature Scale of 1990 (ITS90) is defined from 0.65 K upwards to the highest temperature measurable by spectral radiation thermometry, the radiation thermometry being based on the Planck radiation law. Part I of this paper descr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830671

80. The Effect of Vibrational Relaxation of the Discharge Coefficient of Critical Flow Venturis
Published: 12/1/2000
Authors: Aaron N Johnson, John D Wright, Shin-ichi Nakao, C L Merkle, Michael R Moldover
Abstract: This paper identifies a new mechanism that can affect the discharge coefficient of critical nozzle flows. Specifically, vibrational relaxation effects are demonstrated to significantly influence the discharge coefficient of selected gases in critical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830656



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