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Displaying records 81 to 88.
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81. Design And Fabrication Of MJTCs On Quartz Substrates At NIST
Topic: Metrology
Published: 6/1/2008
Authors: Thomas E Lipe, Joseph R. Mr. (Joseph R.) Kinard Jr., Luciana Scarioni
Abstract: Wet and dry etching are employed in the fabrication of new planar, thin-film multijunction thermal converters (MJTCs) on quartz membranes and crystalline quartz chips at NIST. The use of crystalline quartz as a material for the membrane and for the c ...

82. Capacitors and Electromagnetic Resonators for Gas Metrology
Topic: 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 ...

83. NIST Calibration Services for Water Flowmeters Water Flow Calibration Facility
Series: Special Publication (NIST SP)
Report Number: 250-73
Topic: Metrology
Published: 8/1/2006
Authors: Iosif I Shinder, Iryna V. Marfenko
Abstract: This document describes the Water Flow Calibration Facility (WFCF) at the National Institute of Standards and Technology (NIST). This facility has three parallel pipelines with diameters of 100, 200 and 400 mm and three weighing systems with capaciti ...

84. A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator
Topic: Metrology
Published: 5/2/2006
Authors: Peter H. Huang, Dean C Ripple, Michael R Moldover, Gregory E Scace
Abstract: We developed a stable reference hygrometer suitable for operation at temperatures above ambient that has a robust design, inherent stability, and a well-understood theory of measurement. This hygrometer uses a reentrant, radio-frequency, cavity reson ...

85. 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 ...

86. 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 ...

87. 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 ...

88. 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 ...

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