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Author: robert berg

Displaying records 11 to 20 of 25 records.
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11. Multi-Sample Couette Viscometer for Polymer Formulations
Published: 1/1/2005
Authors: H J Walls, Robert F Berg, Eric J. Amis
Abstract: We describe a prototype scalable viscometer aimed at facilitating rapid measurements of multiple samples. The device simultaneously measures the viscosity of four samples in an array of Couette cells. Each cell contains a rotor with an embedded perma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852329

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. Critical Viscosity of the Ionic Mixture Triethyl n-Hexyl Ammonium Triethyl n-Hexyl borate in Diphenyl Ether
Published: 9/15/1998
Authors: S. Wiegand, Robert F Berg, Johanna M.H. Levelt-Sengers
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902025