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Author: robert berg

Displaying records 21 to 30 of 49 records.
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21. Quartz capillary flow meter for gases
Published: 3/1/2004
Author: Robert F Berg
Abstract: This article describes an accurate meter for gas flow rates below 1000 micromol/s. (~1 micromol/s  1.3 cm3/min at 0 °C and 1 atm.) Two gauges measure the input and output pressures as the gas flows through a flow element consisting of either ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915338

22. Development of a Combinatorial Rheometer for Polymer Formulations
Published: 2/1/2004
Authors: H J Walls, Robert F Berg, Kathryn L Beers, Eric J. Amis
Abstract: Finding the best formulation for a new application, or fine-tuning an existing formulation to meet various customer needs, requires extensive sample preparation and testing. Our goal is to make this exploration more efficient for the property of visc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852353

23. NIST-IMGC Comparison of Gas Flows Below 1 Liter per Minute
Published: 6/13/2003
Authors: Robert F Berg, G Cignolo
Abstract: We compared the IMGC and NIST standards for small gas flows at the IMGC. The IMGC standard is a recently developed primary flow meter that extracts a large piston out of a temperature-controlled chamber. Controlling the piston's speed holds the pre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830791

24. Two Primary Standards for Low Flows of Gases
Published: 9/1/2002
Authors: Robert F Berg, S A Tison
Abstract: We describe two primary standards for gas flow in the range from 0.1 to 1000 mol/s. (1 mol/s =1.3448 standard cubic centimeters per minute.) The first standard is a volumetric technique in which measurements of pressure, volume, temperature, and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830793

25. Mass Flow Research and Standards: NIST Workshop Results
Published: 7/1/2001
Authors: Robert F Berg, David S. Green, G E. Mattingly
Abstract: A recent workshop at the National Institute of Standards and Technology (NIST) identified research and standards that will benefit users and manufacturers of mass flow controllers and related equipment. The workshop identified problems with flow mea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830708

26. Laminar Flow of Four Gases Through a Helical Rectangular Duct
Published: 2/1/2001
Authors: Robert F Berg, S A Tison
Abstract: We report measurements and a model of gas flow through a helical duct of rectangular cross section. The measurements on helium, nitrogen, argon, and sulfur hexafluoride yielded molar flow rates from observations of the rate of rise of pressure in a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831586

27. Semiconductor Measurement Technology: Workshop on Mass Flow Measurement and Control for the Semiconductor Industry
Series: Special Publication (NIST SP)
Report Number: 400-101
Published: 2/1/2001
Authors: Robert F Berg, David S. Green, G E. Mattingly
Abstract: On 15-16 May 2000 at NIST, 45 scientists and engineers met to identify research and standards that will benefit users and manufacturers of mass flow controllers (MFCs) and related equipment. Most attendees represented companies closely associated wi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830707

28. Frequency-Dependent Viscosity of Xenon Near the Critical Point
Published: 10/1/1999
Authors: Robert F Berg, Michael R Moldover, G A Zimmerli
Abstract: We used a novel, overdamped oscillator aboard the Space Shuttle to measure the viscosity {eta} of xenon near its critical density {rho}^dc^ and temperature T^dc^. In microgravity, useful data were obtained within 0.1 mK of T^dc^, corresponding to a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832041

29. Viscoelasticity of Xenon Near the Critical Point
Published: 2/1/1999
Authors: Robert F Berg, Michael R Moldover, G A Zimmerli
Abstract: Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency range 2 Hz [less than or equal to} f {less than or equal to} 12 Hz. The measured viscosity ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831516

30. Critical Viscosity of Xenon: Surprises and Scientific Results
Published: 10/1/1998
Authors: Robert F Berg, Michael R Moldover, G A Zimmerli
Abstract: The Critical Viscosity of Xenon (CVX) experiment, which flew on board Space Shuttle flight STS-85 in August 1997, measured the viscosity of xenon near the liquid-vapor critical point. Very close to the critical temperature (T^dc^ = 290 K), the visco ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831511



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