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Displaying records 21 to 30 of 104 records.
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21. Optimizing Acoustic Measurements of the Boltzmann Constant
Topic: Chemical Engineering & Processing
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

22. Perturbations from Ducts on the Modes of Acoustic Thermometers
Series: Journal of Research (NIST JRES)
Topic: Chemical Engineering & Processing
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

23. Reference measurements of Hydrogen's Dielectric Permittivity
Topic: Chemical Engineering & Processing
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

24. High Definition Flow
Topic: Chemical Engineering & Processing
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

25. The Internal Fluid Mechanics of Explosive Trace Detectors using Computational Fluid Dynamics
Series: OTHER
Topic: Chemical Engineering & Processing
Published: 5/1/2009
Authors: Matthew E Staymates, Wayne Smith, John G Gillen
Abstract: Efforts are underway in the Surface and Microanalysis Science Division at the National Institute of Standards and Technology to study the vapor transport mechanisms inside explosive trace detection instruments (ETD s) and produce standard test materi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901483

26. The Electric And Magnetic Susceptibilities Of Gaseos Oxygen: Comparisons Of New Measurements and Modern Theory
Topic: Chemical Engineering & Processing
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

27. Natural Gas Flow Calibration Service
Series: Special Publication (NIST SP)
Topic: Chemical Engineering & Processing
Published: 8/1/2008
Author: Aaron N Johnson
Abstract: This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine tur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832323

28. Shear Thinning Near the Critical Point of Xenon
Topic: Chemical Engineering & Processing
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830987

29. Droplet Size Distributions in the Spray From Commercial Fogger Type Pepper Spray Products
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7334
Topic: Chemical Engineering & Processing
Published: 4/1/2008
Authors: Cary Presser, Edward V White, Alim A Fatah
Abstract: This report documents a preliminary investigation of the measurement of droplet sizes in the spray from four commercial fogger type pepper spray products. Droplet sizes were detected over the range of 2 mm to 120 mm by phase Doppler interferometry ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832150

30. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Topic: Chemical Engineering & Processing
Published: 8/1/2007
Authors: E May, Robert F Berg, Michael R Moldover
Abstract: We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830996



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