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Displaying records 11 to 20 of 24 records.
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11. Long-term stability of metal-envelope enclosed ionization gauges
Topic: Gas Metrology
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: Ionization vacuum gauges are used as secondary standards by calibration laboratories and as transfer standards in intercomparisons among metrology laboratories. A quantitative measurement of gauge stability with respect to the gauge calibration fact ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911249

12. Microwave Determination of the Volume of a Pressure Vessel
Topic: Gas Metrology
Published: 12/9/2014
Authors: Michael R Moldover, James W Schmidt, Keith A Gillis, James B. Mehl, John D Wright
Abstract: Using microwave techniques that are scalable to very large volumes, we measured the interior volume of a 0.3 m^u3^, commercially-manufactured, pressure vessel with an uncertainty of 0.05 %, as confirmed by independent, more-accurate, gas-expansion me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917302

13. Natural Gas Flow Calibration Service
Series: Special Publication (NIST SP)
Topic: Gas Metrology
Published: 8/1/2008
Author: Aaron N Johnson
Abstract: This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine tur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832323

14. Optimizing Acoustic Measurements of the Boltzmann Constant
Topic: Gas Metrology
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

15. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Topic: Gas Metrology
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

16. Reference measurements of Hydrogen's Dielectric Permittivity
Topic: Gas Metrology
Published: 8/10/2009
Authors: James W Schmidt, Michael R Moldover, Eric F. May
Abstract: We used a quasi-spherical cavity resonator to measure the relative dielectric permittivity {epsilon}^dr^ of H^d2^ at frequencies from 2.4 GHz to 7.3 GHz, at pressures up to 6.5 MPa, and at the temperatures 273 K and 293 K. The resonator was calibrat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901652

17. Retention Behavior of Alkylated Phenanthrenes on a Smectic Liquid Crystalline Phase: Application to Organic Geochemistry
Topic: Gas Metrology
Published: 12/25/1992
Authors: H. Budzinski, M. Radke, P. Garrigues, Stephen A Wise, J. Bellocq, H. Willsch
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902482

18. Second-order boundary corrections to the radial acoustic eigenvalues for a spherical cavity
Topic: Gas Metrology
Published: 8/17/2012
Author: Keith A Gillis
Abstract: We calculated the eigenvalues of the radially-symmetric acoustic modes of a gas-filled, spherical cavity to order ({delta}^dT^/{I}a{/I})^u2^, where {delta}^dT^ is the thickness of the thermal boundary layer and {I}a{/I} is the radius of the cavity. O ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911620

19. Shear Thinning Near the Critical Point of Xenon
Topic: Gas Metrology
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

20. Standard Photoacoustic Spectrometer: Model and Validation using O2 A-Band Spectra
Topic: Gas Metrology
Published: 6/30/2010
Authors: Keith A Gillis, Daniel K. Havey, Joseph Terence Hodges
Abstract: We model and measure the absolute response of an intensity-modulated photoacoustic spectrometer comprising a 10 cm long resonator and having a {I}Q{/I}-factor of approximately 30. We present a detailed theoretical analysis of the system and predict ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904841



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