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Author: michael moldover

Displaying records 21 to 30 of 98 records.
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21. Cylindrical Acoustic Resonator for the Re-determination of the Boltzmann Constant
Published: 6/1/2010
Authors: J.T. Zhang, H. Lin, X.J. Feng, Keith A Gillis, Michael R Moldover
Abstract: We describe progress towards re-determining the Boltzmann constant {I}k{/I}^dB^ using two fixed-path, gas-filled, cylindrical, acoustic cavity resonators. The longitudinal acoustic resonance modes of a cylindrical cavity have lower quality factors {I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905511

22. Feasibility of an Accurate Dynamic Standard for Water Flow
Published: 6/1/2010
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We used NIST's primary water flow standard to study the feasibility of accurately determining mass flow rates {I}m{/I}^ddot^ of water "dynamically," that is from the time derivative of the weight {I}W{/I} of the collection tank: {I}m{/I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832344

23. Improved NIST Airspeed Calibration Facility
Published: 3/23/2010
Authors: Iosif I Shinder, James M Hall, Michael R Moldover
Abstract: The National Institute of Standards and Technology (NIST) uses a laser Doppler anemometer (LDA) as a working standard for airspeed calibrations in the range 0.15 m/s to 75 m/s (0.34 to 168 miles/hour). We report improved procedures for calibrating th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904871

24. Optimizing Acoustic Measurements of the Boltzmann Constant
Published: 11/22/2009
Author: Michael R Moldover
Abstract: We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant {I}R{/I} using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophys ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902117

25. Perturbations from Ducts on the Modes of Acoustic Thermometers
Series: Journal of Research (NIST JRES)
Published: 9/1/2009
Authors: Keith A Gillis, Michael R Moldover, Hong Lin
Abstract: We examine the perturbations of the modes of an acoustic thermometer caused by circular ducts used either for gas flow or as acoustic waveguides coupled to remote transducers. We calculate the acoustic admittance of circular ducts using a model based ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902237

26. Dynamic Gravitational Standard for Liquid Flow: Model and Measurements
Published: 8/14/2009
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We report progress in testing a dynamic gravimetric standard using both steady and unsteady water flows. For steady flows in the range 10 kg/s to 60 kg/s, the difference between the dynamic standard and NIST s static primary standard was 0.015 % wit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903358

27. Reference measurements of Hydrogen's Dielectric Permittivity
Published: 8/10/2009
Authors: James W Schmidt, Michael R Moldover, Eric F. May
Abstract: We used a quasi-spherical cavity resonator to measure the relative dielectric permittivity {epsilon}^dr^ of H^d2^ at frequencies from 2.4 GHz to 7.3 GHz, at pressures up to 6.5 MPa, and at the temperatures 273 K and 293 K. The resonator was calibrat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901652

28. High Definition Flow
Published: 8/1/2009
Authors: John D Wright, Michael R Moldover
Abstract: From pharmaceutical production to the natural gas market, exact flow measurements are critical. Here's how NIST helps keep us all on the same page.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832391

29. Accurately Measuring Unsteady Water Flows Using A Dynamic Standard
Published: 4/1/2009
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We recently presented and tested a model for a dynamic gravimetric standard for steady water flows. In the range 10 kg/s to 60 kg/s, the difference between the dynamic standard and NIST's static primary standard was 0.015 % with a standard deviat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901476

30. The Electric And Magnetic Susceptibilities Of Gaseos Oxygen: Comparisons Of New Measurements and Modern Theory
Published: 9/25/2008
Authors: Michael R Moldover, E May, James W Schmidt
Abstract: We used a cross capacitor to measure the relative dielectric permittivity {epsilon}^dr^ of O^d2^ at 273 K, 293 K, and 323 K and at pressures up to 6.5 MPa. Simultaneously we measured oxygen's complex refractive index {I}n{/I} using a quasi-spheri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832266



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