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Search Publications by: Michael R Moldover (Assoc)

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Displaying 226 - 250 of 321

Primary Acoustic Thermometer for Use Up to 800 K

April 1, 1999
Author(s)
Dean C. Ripple, Dana R. Defibaugh, Keith A. Gillis, Michael R. Moldover
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 up to

Primary Acoustic Thermometry From 217 K to 303 K

April 1, 1999
Author(s)
Michael R. Moldover, S J. Boyes, A R. Goodwin, Christopher W. Meyer
We report new values for the difference (T T 90) between Kelvin thermodynamic temperatures T and ITS-90, the International Temperature Scale of 1990. The new data span the range 217 K {less then or equal to} T 303 K with standard uncertainties of 0.6 mK. A

Viscoelasticity of Xenon Near the Critical Point

February 1, 1999
Author(s)
Robert F. Berg, Michael R. Moldover, G A. Zimmerli
Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency range 2 Hz [less than or equal to} f {less than or equal to} 12 Hz. The measured viscosity

Critical Viscosity of Xenon: Surprises and Scientific Results

October 1, 1998
Author(s)
Robert F. Berg, Michael R. Moldover, G A. Zimmerli
The Critical Viscosity of Xenon (CVX) experiment, which flew on board Space Shuttle flight STS-85 in August 1997, measured the viscosity of xenon near the liquid-vapor critical point. Very close to the critical temperature (T c = 290 K), the viscosity Η of

Proposed Pressure Standard Based on Capacitance Measurements

July 1, 1998
Author(s)
Michael R. Moldover
We propose to measure the dielectric constant [epsilon] and the thermodynamic temperatue T of helium near 273.16 K and to calculate the pressure p([epsilon],T) of the helium from the fundamental constants, quantum mechanics, and statistical mechanics. If

Acoustic Methods for Transport Properties Measurements in Gases

June 1, 1998
Author(s)
Keith A. Gillis, J B. Mehl, Michael R. Moldover
Two novel acoustic resonators have been developed, one for measuring the viscosity and a second for measuring the Prandtl number of gases. For viscosity measurements, we use a double Helmholtz resonator called the Greenspan viscometer. The Greenspan

Can a Pressure Standard be Based on Capacitance Measurements?

March 1, 1998
Author(s)
Michael R. Moldover
We consider the feasibility of basing a pressure standard on measurements of the dielectric constant [epsilon] and the thermodynamic temperature T of helium near )[degrees]C. The pressure P of the helium would be calculated using the fundamental constants
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