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1. Long-term stability of metal-envelope enclosed ionization gauges
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 ...

2. Precise conductance measurements of a pinhole orifice using a constant-pressure flowmeter
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: A pinhole orifice with a known conductance can be used as the basis of a flowmeter. Commercially available laser-drilled pinhole orifices with diameters ranging from 1.0 μm to 50 μm can have conductances ranging from about 0.1 μL/s to ...

3. Interlaboratory comparison of Helium Low Gas Flow Measurements in the range 10-13 to 10-11 mol/s (10-9 to 10-7 cm3/s)
Published: 3/1/2010
Authors: Dana R Defibaugh, Patrick J Abbott, James A Fedchak
Abstract: An interlaboratory comparison (ILC) of helium low flow measurement capability was recently completed. The comparison was piloted by The National Institute of Standards and Technology (NIST); the majority of the data was taken over a period of approx ...

4. Progress in Primary Acoustic Thermometry at NIST: 273 K to 505 K
Published: 9/1/2003
Authors: Gregory F Strouse, Dana R Defibaugh, Michael R Moldover, Dean C Ripple
Abstract: The NIST Acoustic Thermometer determines the thermodynamic temperature by measuring the speed of sound of argon in a spherical cavity. We obtained the thermodynamic temperature of three fixed points on the Interna-tionalTemperature Scale of 1990: the ...

5. Techniques for Primary Acoustic Thermometry to 800 K
Published: 9/1/2003
Authors: Dean C Ripple, Dana R Defibaugh, Michael R Moldover, Gregory F Strouse
Abstract: The NIST Primary Acoustic Thermometer will measure the difference between the International TemperatureScale of 1990 and the Kelvin Thermodynamic Scale throughout the range 273 K to 800 K with uncertainties of only afew millikelvins. The acoustic the ...

6. 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 ...

7. 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

8. Primary Acoustic Thermometer for Use Up to 800 K
Published: 4/1/1999
Authors: Dean C Ripple, Dana R Defibaugh, Keith A Gillis, Michael R Moldover
Abstract: Primary acoustic thermometers determine the thermodynamic temperature of a monatomic gas from measurements of the speed of sound in the gas. Here, we describe the design and construction of an acoustic thermometer designed to operate at temperatures ...

9. Vapor Pressure of 2-(Difluoromethoxy)-1,1,1-trifluoroethane CHF^d2^OCH^d2^CF^d3^ (HFE-245)
Published: 8/5/1998
Authors: A R. Goodwin, Dana R Defibaugh, L A. Weber

10. Compressed and Saturated Liquid Densities for 18 Halogenated Organic Compounds
Published: 12/1/1997
Authors: Dana R Defibaugh, Michael R Moldover

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