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Author: james schmidt
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1. 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

2. 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

3. 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

4. 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

5. CCM Key Comparison in the Pressure Range 0.05 MPa to 1 MPa (Gas Medium, Gauge Mode) - Phase A1: Dimensional Measurements and Calculation of Effective Area
Published: Date unknown
Authors: G F Molinar, B Rebaglia, A Sacconi, J C Legras, G P Vailleau, James W Schmidt, John Richard Stoup, D R Flack, W Sabuga, O Jusko
Abstract: The results obtained by five laboratories in the determination of the effective areas of two gas-operated 10 cm^u2^ piston-cylinder assemblies from dimensional measurements carried out as part, called phase A1, of a key comparison in the pressure ran ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830638

6. CCM Key Comparison in the Pressure Range 50 kPa to 1000 kPa (gas medium, gauge mode) - Phase A2: Pressure Measurements
Published: Date unknown
Authors: J Jaeger, J C Legras, G F Molinar, James W Schmidt
Abstract: As a part of a wide CCM key comparison, this report gives the results of a comparison of pressure measurements in the range of gauge pressure 0,05 MPa to 1 MPa. The two transfer standards used were pressure balances equipped with large (10 cm^u2^) ef ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830644

7. Capacitors and Electromagnetic Resonators for Gas Metrology
Published: 5/1/2007
Authors: Michael R Moldover, James W Schmidt
Abstract: Gas-filled capacitors are being used as primary thermometers and they show promise as primary pressure standards and for measuring the Boltzmann constant. With these metrological applications in mind, we discuss the advantages and disadvantages of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830986

8. 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

9. 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

10. Equation of State and Ideal-Gas Heat Capacity of a Gaseous Mixture of 1,1,1,2-Tetrafluoroethane, Pentafluoroethane, and Difluoromethane
Published: 5/1/1997
Authors: John J. Hurly, James W Schmidt, Keith A Gillis
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100431



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