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You searched on: Topic Area: Metrology

Displaying records 81 to 85.
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81. Relaxation Effects in Small Critical Nozzles
Topic: Metrology
Published: 1/1/2006
Authors: Aaron N Johnson, C L Merkle, Michael R Moldover, John D Wright
Abstract: We computed the flow of four gases (He, N^d2^, CO^d2^, and SF^d^6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for {tau}^drelax^, a species-dependent relaxation time that c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830846

82. Gas Flowmeter Calibrations with the 34 L and 677 L PVTt Standards
Series: Special Publication (NIST SP)
Topic: Metrology
Published: 6/23/2004
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Gina M Kline
Abstract: This document provides a description of the 34 L and 677 L pressure, volume, temperature, and time (PVTt) primary gas flow standards operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. These facilities are used to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830866

83. Analysis of Dimensional Metrology Standards
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6847
Topic: Metrology
Published: 6/1/2001
Authors: Thomas Rollin Kramer, John Evans, Simon Paul Frechette, John A Horst, Hui-Min Huang, Elena R Messina, Frederick M Proctor, William G Rippey, Harry A. Scott, Theodore Vincent Vorburger, Albert J. Wavering
Abstract: This is an analysis of standards related to dimensional metrology, with recommendations regarding standards development. The analysis focuses on the degree to which existing and developing standards provide a complete set of non-overlapping specifica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821714

84. NIST Calibration Services for Gas Flow Meters: Piston Prover and Bell Prover Gas Flow Facilities
Series: Special Publication (NIST SP)
Report Number: 250-49
Topic: Metrology
Published: 8/1/1998
Authors: John D Wright, G E. Mattingly
Abstract: This document provides a description of the small and medium range gas flow calibration facilities at the National Institute of Standards and Technology (NIST), Fluid Flow Group, as reported in NIST Special Publication 250 for Test Nos. 18010C-18040C ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830588

85. Development of an Ultra-Pure, Carrier-Free 209Po Solution Standard
Series: Journal of Research (NIST JRES)
Topic: Metrology
Published: Date unknown
Authors: Ronald Colle, Ryan P Fitzgerald, Lizbeth Laureano-Perez
Abstract: Ultra-pure, carrier-free 209Po solution standards have been prepared and standardized for their massic alpha-particle emission rate. The standards, which will be disseminated by the National Institute of Standards and Technology (NIST) as Standard Re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918599



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