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You searched on: Author: james schmidt

Displaying records 11 to 20 of 25 records.
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11. Quasi-Spherical Cavity Resonators for Metrology Based on the Relative Dielectric Permittivity of Gases
Published: 10/1/2004
Authors: E May, Laurent Pitre, J B. Mehl, Michael R Moldover, James W Schmidt
Abstract: We evaluate a quasi-spherical, copper, microwave cavity resonator for accurately measuring the relative dielectric permittivity {epsilon^dr^(p,T)} of helium and argon. In a simple, crude approximation the cavity s shape is a triaxial ellipsoid with a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830894

12. A Primary Dead-Weight Tester for Pressures (0.05-1.0) MPa
Series: Journal of Research (NIST JRES)
Published: 4/1/2003
Authors: K. Jain, Walter J. Bowers Jr., James W Schmidt
Abstract: Recent advances in technology on two fronts, 1) the fabrication of large diameter pistons and cylinders with good geometry, and 2) the ability to measure the dimensions of these components with high accuracy, have allowed dead-weight testers at NIST ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830339

13. Dielectric Permittivity of Eight Gases Measured with Cross Capacitors
Published: 3/1/2003
Authors: James W Schmidt, Michael R Moldover
Abstract: A 4-ring, toroidal cross capacitor was used to measure accurately the relative dielectric permittivity {epsilon}(p,T) of He, Ar, N^d2^, O^d2^, CH^d4^, C^d2^H^d6^, C^d3^H^d8^, and CO^d2^. ({epsilon} is often called the dielectric constant. ) The dat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830802

14. A Double-Primary Dead-Weight Tester for Pressures (35-175) kPa in Gage Mode
Series: Journal of Research (NIST JRES)
Published: 2/1/2003
Authors: K. Jain, Y Q Cen, Walter J. Bowers Jr., James W Schmidt
Abstract: Primary pressure standards in the atmospheric pressure range are often established using mercury manometers. Less frequently, controlled-clearance dead-weight testers in which one component (normally the piston) has been dimensionally measured have ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830783

15. IUPAC Experimental Thermodynamics Volume VI: Measurement of the Thermodynamic Properties of Single Phases: CH. 3 Pressure; b) Piston Gauges
Published: 12/1/2002
Authors: Charles D Ehrlich, James W Schmidt
Abstract: The last twenty five years have seen significant advances in the technology and theoretical models associated with the use of piston gauges for the measurement of both pneumatic and hydraulic pressure. Most notably, the incorporation of computers an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830212

16. Characterization of a Controlled-Clearance Piston Gauge Using the Heydemann-Welch Model
Published: 8/1/2002
Authors: T Kobata, James W Schmidt, Douglas A Olson
Abstract: A study on the characterization of a controlled-clearance piston gauge was performed at the National Institute of Standards and Technology (NIST). The characterization covers the pressure range from 37.5 MPa to 288 MPa, at jacket pressures up to 76 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830784

17. NCSL Pressure Comparison At 0.69 Mpa (100 psi) and 1.4 Mpa (200 psi)
Published: 7/1/2000
Authors: Robert G Driver, James W Schmidt
Abstract: The pressure and Vacuum Group at NIST has piloted a pressure comparison under the auspices of the Measurement comparison program committee for the NCSL. A 1.4 MPa (~200 psi)transducer package used as a transfer standard was circulated among 20 domes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830692

18. A Model for Drag Forces in the Crevice of Piston Gages in the Viscous and Molecular Flow Regimes
Published: 6/1/1999
Authors: James W Schmidt, Charles D Ehrlich, S A Tison
Abstract: A model for drag forces in the crevice of pneumatic piston gages is presented. The model uses an interpolation function for momentum transfer between the piston and the cylinder mediated by the gas flowing in the crevice. The interpolation function ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830639

19. A primary pressure standard at 100 kPa
Published: 6/1/1999
Authors: James W Schmidt, Y Q Cen, Robert G Driver, Walter J. Bowers Jr., J C. Houck, S A Tison, Charles D Ehrlich
Abstract: Primary pressure standards in the atmospheric pressure range are often established using mercury manometers. To a lesser extent controlled-clearance dead-weight testers in which one component (normally the piston) has been dimensionally measured hav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830636

20. Research at High Pressure
Published: 12/1/1997
Authors: James W Schmidt, S A Tison, D B Ward
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100320



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