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Author: michael moldover

Displaying records 61 to 70 of 100 records.
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61. 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

62. 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

63. 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

64. 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

65. 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

66. Ab Initio Values of the Thermophysical Properties of Helium as Standards
Series: Journal of Research (NIST JRES)
Published: 9/1/2000
Authors: John J. Hurly, Michael R Moldover
Abstract: Recent quantum mechanical calculations of the interaction energy of pairs of helium atoms are accurate and some include reliable estimates of their uncertainty. We combined these recent ab initio results with earlier published results to obtain a he ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831633

67. An Improved Greenspan Acoustic Viscometer
Published: 9/1/2000
Authors: J Wilhelm, Keith A Gillis, J B. Mehl, Michael R Moldover
Abstract: We improved the Greenspan acoustic viscometer (double Helmholtz resonator) to measure the viscosity of gases at temperatures from 250 K to 400 K and at pressures up to 3.4 MPa. In anticipation of handling corrosive gases, all wetted parts of the app ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831638

68. Toroidal Cross-Capacitor for Measuring the Dielectric Constant of Gases
Published: 7/1/2000
Authors: T J. Buckley, J O. Hamelin, Michael R Moldover
Abstract: We describe toroidal cross capacitors built to accurately measure the dielectric constant of gases. We tested the capacitors by measuring the dielectric polarizability of helium and argon at 7 and 50 degrees C at pressures up to 3 MPa. For helium, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831584

69. Thermodynamic Properties of Sulfur Hexafluoride
Published: 5/1/2000
Authors: John J. Hurly, Dana R Defibaugh, Michael R Moldover
Abstract: We present new vapor phase speed-of-sound data u(P,T), new Burnett density-pressure-temperature data {rho}(P,T), and a few vapor pressure measurements for sulfur hexafluoride (SF^d6^). The speed-of-sound data spanned the temperature range 230 K {le ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831562

70. Primary Acoustic Thermometry for Use Up to 800 K
Published: 12/1/1999
Authors: Dean C Ripple, Dana R Defibaugh, Keith A Gillis, Michael R Moldover
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100632



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