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Author: weston tew

Displaying records 11 to 20 of 46 records.
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11. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830990

12. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830971

13. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830960

14. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830941

15. 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
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830914

16. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830949

17. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31750

18. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830908

19. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830884

20. Johnson Noise Thermometry Using a Quantum Voltage Noise Source for Calibration
Published: 6/1/2004
Authors: Sae Woo Nam, Samuel Paul Benz, Paul David Dresselhaus, 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 calibrated noise source, we have been able to measure the gallium and w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31626