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You searched on: Author: weston tew

Displaying records 21 to 30 of 57 records.
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21. Estimating the Triple Point Isotope Effect and the Corresponding Uncertainties for Cryogenic Fixed Points
Published: 2/1/2008
Author: Weston Leo Tew
Abstract: The estimation of sensitivities of melting temperatures due to isotopic variations in monatomic and diatomic atmospheric gases is developed from both theoretical and semi-empirical standpoints. The state of what is currently known regarding vapor pre ...

22. A Determination of the Ratio of the Zinc Freezing Point to the Tin Freezing Point by Noise Thermometry
Published: 9/12/2007
Authors: Weston Leo Tew, John Labenski, Samuel Paul Benz, Sae Woo Nam, Paul David Dresselhaus
Abstract: We have used a Johnson-Noise Thermometer (JNT) with a Quantized Voltage Noise Source (QVNS) as a calculable reference to determine the ratio of temperatures near the Zn freezing point to those near the Sn freezing point. The temperatures are derived ...

23. Resistance-Based Scaling of LF-and MF-Band Thermal Noise Powers
Published: 4/1/2007
Authors: John Labenski, Weston Leo Tew, Sae Woo Nam, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs
Abstract: A conventional technique for scaling thermal noise power in Johnson Noise Thermometry (JNT) is via resistance ratios. We describe measurements in the low to medium frequency (LF/MF) bands using this approach via correlation methods in the frequency d ...

24. ITS-90 Non-Uniqueness From PRT Subrange Inconsistencies Over the Range 24.56 K to 273.16 K
Published: 9/1/2006
Authors: Christopher W Meyer, Weston Leo Tew
Abstract: Calculations have been performed to study ITS-90 non-uniqueness over the range 24.5561 K to 273.16 K, where the scale is defined by an interpolating platinum resistance thermometer (PRT) that is calibrated via sets of defined fixed points. Over this ...

25. Acoustic Thermometry: New Results From 273 K to 77 K and Progress Towards 4 K
Published: 1/1/2006
Authors: Laurent Pitre, Michael R Moldover, Weston Leo Tew
Abstract: We used a quasi-spherical cavity as an acoustic and microwave resonator to measure the thermodynamic temperatures T of the triple points of mercury, argon, neon, and equilibrium hydrogen, and to measure the difference T - T90, in the range 7 K to 273 ...

26. Comment on Freezing Point Mixtures of H^d2^^u16^O With H^d2^^u17^O and Those of Aqueous CD^d3^CH^d2^OH and CH^d3^^u13^CH^d2^OH Solutions
Published: 10/1/2005
Authors: Weston Leo Tew, D. R White

27. Isotopic and Other Influences of the Realization of the Triple Point of Hydrogen
Published: 8/1/2005
Authors: B Fellmuth, L Wolber, Y Hermier, F Pavese, PPM Steur, I Peroni, A Szmyrka-Grzebyk, L Lipinski, Weston Leo Tew, H Nakano, H Sakurai, O Tamura, D I Head, K D Hill, A G Steele
Abstract: Within an international collaboration of the eight metrological institutes represented by the authors, the dependence of the triple-point tmeperature of equilibrium, hydrogen on the deuterium content at low concentrations has been precisely determine ...

28. Progress on Johnson Noise Thermometry using a Quantum Voltage Noise Source for Calibration
Published: 4/1/2005
Authors: Sae Woo Nam, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs, Weston Leo Tew, D. R White, John M. Martinis
Abstract: We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the ...

29. Double Anomalous Peak in the Heat Capacity Just Below the Triple Point of Staurated e-H^d2^ With FeO(OH)^u1
Published: 1/1/2005
Authors: T Nakano, Weston Leo Tew, O Tamura, H Sakurai
Abstract: The heat capacity of e-Hd2 with powder ofFeO(OH) used as a catalyst for ortho-para equilibration has been investigated using sealed cells fabricated at the National Institute of Standards and Technology and at the National Metrology Institute of Japa ...

30. CCT Key Comparison No 1 (CCT-K1): Realisations of the ITS-90, 0.65 K to 24.5561 K, Using Rhodium-Iron Resistance Thermometers
Published: 6/1/2004
Authors: R L Rusby, Christopher W Meyer, Weston Leo Tew, D I Head, K D Hill, O Tamura, P A. de Groot, B Fellmuth, A Storm, A Peruzzi, J Engert, D N Astrov, Y Dedikov, G A Kytin
Abstract: At its meeting in 1996 the CCT initiated five Key Comparisons to test the equivalence of realisations of the ITS-90 between National Measurement Institutes. CCT-K1 covers the temperature range from 0.65 K to 24.5561 K, in which the ITS-90 is defined ...

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