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Displaying 426 - 450 of 5221

Metrological Traceability Frequently Asked Questions and NIST Policy

May 6, 2021
Author(s)
Sally Bruce, Antonio Possolo, Robert Watters
The NIST policy on metrological traceability (NIST P 5800.00, which became effective on May 31st, 2019) is transcribed and supplemented with a review of relevant terminology and with a list of frequently asked questions and answers. This list updates and

Report of the 104th National Conference on Weights and Measures

May 3, 2021
Author(s)
Yvonne Branden
The 104th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 14 - 18, 2019, at the Hyatt Regency Milwaukee Hotel, Milwaukee, Wisconsin. The theme of the meeting was "Assuring Equity in the Marketplace: NIST and NCWM

Distributed fiber optic measurements of strain and temperature in long-span composite floor beams with simple shear connections subject to compartment fires

May 1, 2021
Author(s)
Yanping Zhu, Matthew Klegseth, Yi Bao, Matthew Hoehler, Lisa Choe, Genda Chen
This study explores an instrumentation strategy using distributed fiber optic sensors to measure strain and temperature through the concrete volume in large-scale structures. Single-mode optical fibers were deployed in three 12.8 m long steel and concrete

NIST on a Chip: Photonic and Quantum-Based Sensors for Measurements of Pressure, Vacuum, Temperature and Beyond!

April 29, 2021
Author(s)
Jay H. Hendricks, Zeeshan Ahmed, Daniel Barker, Stephen Eckel, James A. Fedchak, Nikolai Klimov, Julia Scherschligt
At the core of the NIST on a Chip (NoAC) program is the idea that measurement technology can be developed to enable metrology to be done "outside the National Metrology Institute" by virtue of deployed and often miniaturized standards (that can also serve

Accurate measurement of the through-plane water content of proton-exchange membranes using neutron radiography

April 21, 2021
Author(s)
Daniel S. Hussey, David L. Jacobson, Dusan Spernjak, Adam Weber, Rangachary Mukundan, Joseph Fairweather, Eric Brosha, John Davey, Jacob Spendelow, Rodney Borup
The water sorption of proton-exchange membranes (PEMs) was measured in situ using high-resolution neutron imaging in small-scale fuel-cell test sections. A detailed characterization of the measurement uncertainties and corrections associated with the

Evaluations of a Detector-Limited Digital Impedance Bridge

April 6, 2021
Author(s)
Mona Feige, Stephan Schlamminger, Yicheng Wang
We tested a simple digital impedance bridge using two nominally equal resistors to form a 1:1 ratio. We focused on resolution and stability of the detectors. Fluctuations of the source voltages were largely removed through postprocessing of the digitized
Displaying 426 - 450 of 5221
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