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NIST Authors in Bold

Displaying 176 - 200 of 1005

A gas pressure scale based on primary standard piston gauges

December 6, 2010
Author(s)
Douglas A. Olson, Robert G. Driver, Walter J. Bowers Jr.
… and Technology has redefined its gas pressure scale, up to 17 MPa, based on two primary standard piston gauges. The … smaller diameters form the scale extending up to 17 MPa. Six of the piston gauges were directly compared to … piston gauges operating to 7 MPa were compared to the 1.4 MPa gauges, and two piston gauges operating to 17 MPa were …

Residual stability of a fiber-based frequency comb

May 6, 2007
Author(s)
William C. Swann, Ian R. Coddington, Luca Lorini, Jason Stalnaker, J. C. Bergquist, Scott Diddams, Nathan R. Newbury
… through a Ti:sapphire frequency comb. We find 6 x 10 -17 stability at one second and 1 x 10 -18 at 1000 seconds. …

A method for comparing remote optical clocks over a free-space optical link

July 9, 2012
Author(s)
William C. Swann, Fabrizio R. Giorgetta, Ian R. Coddington, Esther Baumann, Jean-Daniel Deschenes, Laura C. Sinclair, Alexander M. Zolot, Nathan R. Newbury
… a method to compare optical clocks approaching 10 -17 uncertainties through the exchange of optical pulses from …

Recent atomic clock comparisions at NIST

October 1, 2008
Author(s)
Luca Lorini, Neil Ashby, Anders Brusch, Scott Diddams, Robert E. Drullinger, Eric Eason, Tara Fortier, Pat Hastings, Thomas P. Heavner, David Hume, Wayne M. Itano, Steven R. Jefferts, Nathan R. Newbury, Tom Parker, Till P. Rosenband, Jason Stalnaker, William C. Swann, David J. Wineland, James C. Bergquist
… with a fractional frequency uncertainty of (5.2 &#8226 10 -17 ). The record of such measurements over the last year … of α and constraints (α/α = (–1.6 ± 2.3) &#8226 10 -17 yr -1 ), consistent with zero. …

A Case for Rethinking ASCE 41 Performance-Based Assessment Criteria for Cold-Formed Steel

May 25, 2022
Author(s)
Matthew Speicher, Zhidong Zhang, Benjamin W. Schafer
… paper is to evaluate the impact of applying the ASCE 41-17 performance-based design provisions on a 2-story case … American Society of Civil Engineers Standard 41 (ASCE 41-17) incorporates new provisions for the assessment of … existing building as-sessment). Additionally, ASCE 41-17 can be used as an alternative approach to new building …

Force modeling for hybrid manufacturing

June 21, 2018
Author(s)
Michael Gomez, Jarred C. Heigel, Tony Schmitz
… selective laser sintering. These workpieces included a 17-4 stainless steel substrate (wrought) and a 17-4 stainless steel additively manufactured rib. After …

Frequency Comparison of Al + and Hg + Optical Standards

June 24, 2007
Author(s)
Till P. Rosenband, David Hume, Anders Brusch, Luca Lorini, P. O. Schmidt, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, W Swann, Windell Oskay, Wayne M. Itano, David J. Wineland, James C. Bergquist
… the statistical measurement uncertainty is below 5 x 10 -17 . Recent ratio measurements show a reproducibility that is …
Displaying 176 - 200 of 1005
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