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You searched on: Author: Keith Gillis

Displaying records 1 to 10 of 35 records.
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1. Detecting leaks in gas-filled pressure vessels using acoustic resonances
Published: 5/6/2016
Authors: Keith A Gillis, Michael R Moldover, James B. Mehl
Abstract: We demonstrate that a leak from a large, unthermostatted pressure vessel into ambient air can be detected an order of magnitude more effectively by measuring the time dependence of the ratio {I}p{/I}/{I}f{/I}^u2^ than by measuring the ratio {I}p{/I}/ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920147

2. Acoustic and microwave tests in a cylindrical cavity for acoustic gas thermometry at high temperature
Published: 2/22/2016
Authors: K. Zhang, X.J. Feng, Keith A Gillis, Michael R Moldover, Jintao Zhang, Hong Lin, Jifeng Qu
Abstract: Relative primary acoustic gas thermometry determines the ratios of thermodynamic temperatures from measured ratios of acoustic and microwave resonance frequencies in a gas-filled metal cavity on isotherms of interest. When measured in a cavity with k ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919671

3. Measurement Challenges and Metrology for Monitoring CO2 Emissions from Smokestacks ‹ Workshop Summary
Series: Special Publication (NIST SP)
Report Number: 1201
Published: 1/20/2016
Authors: Aaron N Johnson, Rodney A Bryant, Tamae M Wong, James R Whetstone, Eric Harman, Woong Kang, Keith A Gillis, Hsin-Hung Lee, Iosif I Shinder, Liang Zhang
Abstract: On April 20-21, 2015, NIST hosted a workshop that, through measurement science, enabled the owners of stationary sources (primarily the electric power industry) and their regulatory agencies (federal and state) to better characterize greenhouse gas ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919405

4. Test of a virtual cylindrical acoustic resonator for determining the Boltzmann constant
Published: 8/19/2015
Authors: XiaoJuan Feng, Hong Lin, Keith A Gillis, Michael R Moldover, Jintao Zhang
Abstract: We report progress in determining the Boltzmann constant {I}k{/I}^dB^ using a virtual acoustic resonator derived by combining the measured frequencies of the longitudinal acoustic modes of two argon-filled, cylindrical, cavity resonators in such a wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918094

5. Measuring collected gas with microwave and acoustic resonances
Published: 4/23/2015
Authors: Keith A Gillis, James W Schmidt, Michael R Moldover, James B. Mehl
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I} of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel ("tank") with a relative standard uncertainty of {I}u{ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918365

6. "Weighing" a Gas With Microwave and Acoustic Resonances
Published: 3/24/2015
Authors: Keith A Gillis, James B. Mehl, James W Schmidt, Michael R Moldover
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I}of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel ("tank") with a relative uncertainty of {I}u{/I}^dr^({I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917698

7. Microwave Determination of the Volume of a Pressure Vessel
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

8. Photoacoustic Spectrometer for Accurate, Continuous Measurements of Atmospheric Carbon Dioxide Concentration
Published: 6/19/2014
Authors: Joseph Terence Hodges, Zachary D Reed, Brent A Sperling, Roger D van Zee, James R Whetstone, Keith A Gillis
Abstract: We have developed a portable photoacoustic spectrometer that offers routine, precise and accurate measurements of atmospheric carbon dioxide mixing ratios. The spectrometer is temperature controlled, continuously samples and dries atmospheric air, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915516

9. Acoustic Techniques for Measuring Transport Properties of Gases
Published: 5/22/2014
Authors: Keith A Gillis, Michael R Moldover
Abstract: We describe the principles, techniques, and performance of acoustic resonators used to measure the shear viscosity, the thermal conductivity, and the bulk viscosity in gases. We developed the Greenspan acoustic viscometer at NIST, where colleagues us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914841

10. Improved Determination of the Boltzmann Constant using a Single, Fixed-Length Cylindrical Cavity
Published: 8/27/2013
Authors: Hong Lin, Keith A Gillis, XiaoJuan Feng, Michael R Moldover, J.P. Sun, J.T. Zhang, Y.Y. Duan
Abstract: We report improvements to our previous [Zhang et al., Intl. J. Thermophysics, 32, 1297 (2011)] determination of the Boltzmann constant kB using a single 80 mm-long cylindrical cavity. In this work, the shape of the gas-filled resonant cavity is clos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913803



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