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Displaying 226 - 250 of 5220

Gas Flow Standards and Their Uncertainty

December 12, 2022

Author(s)

John D. Wright, Aaron Johnson, Michael R. Moldover, Shin-ichi Nakao

We review diverse types of gas flow standards that are used to calibrate other gas flow meters. For each type of standard, we describe the principles of its operation and at least one hardware example. We identify the practical limits of the example's

Quantitative characterization of epitaxial graphene for the application of quantum Hall resistance standard

December 12, 2022

Author(s)

Linli Meng, Alireza Panna, Swapnil Mhatre, Albert Rigosi, Shamith Payagala, Dipanjan Saha, Ngoc Thanh Mai Tran, Ching-Chen Yeh, Randolph Elmquist, Angela R. Hight Walker, Dean G. Jarrett, David B. Newell, Yanfei Yang

Cannabis Laboratory Quality Assurance Program: Exercise 2 Moisture Final Report

November 29, 2022

Author(s)

Chuck Barber, Colleen E. Bryan Sallee, Carolyn Burdette, Shaun Kotoski, Melissa M. Phillips, Walter Brent Wilson, Laura Wood

In 2020, NIST launched Cannabis Laboratory Quality Assurance Program (CannaQAP) to improve the comparability of the analytical measurements of cannabis and cannabis-derived products in forensic and cannabis (hemp and marijuana) testing laboratories

Progress of Quantum Hall Research for Disseminating the Redefined SI

November 19, 2022

Author(s)

Albert Rigosi, Mattias Kruskopf, Alireza Panna, Shamith Payagala, Dean G. Jarrett, Randolph Elmquist, David B. Newell

Quasi-continuous voltage standard using sinusoidal and pulse-driven Josephson junction arrays

November 16, 2022

Author(s)

Dimitrios Georgakopoulos, Ilya Budovsky, Samuel P. Benz

Josephson voltage standards (JVSs) provide a primary realization of the volt, the unit of electromotive force. They generate direct (dc) voltages up to 10 V and show agreement better than 1 nV/V at 10 V. For JVSs based on the sinusoidal [or continuous-wave

DIMENSIONAL METROLOGY IN DETERMINATION OF G WITH BIPM'S TORSION BALANCE

November 7, 2022

Author(s)

Vincent Lee, Stephan Schlamminger, Leon Chao, David B. Newell, Jon Pratt, Craig Shakarji, Clive Speake

This paper discusses the dimensional metrology challenges encountered while performing G measurements using the BIPM torsion balance and our solutions.

REPEATABILITY AND SENSITIVITY OF A ROTATING DRUM METHOD FOR RHEOLOGICAL CHARACTERIZATION OF STAINLESS STEEL POWDERS USED FOR ADDITIVE MANUFACTURING

November 6, 2022

Author(s)

Justin Whiting, Vipin Tondare, Shawn P. Moylan

There remains a need for rheological characterization of metal powder used for powder-spreading-based additive manufacturing (AM). Novel powder rheometers introduced to the commercial market for this purpose must be rigorously evaluated for repeatability

Precise high resistance comparison between the NMIJ Traveling Dual Source Bridge and the NIST Adapted Wheatstone Bridge

October 28, 2022

Author(s)

Takehiko Oe, Shamith Payagala, Alireza Panna, S. Takada, N. Kaneko, Dean G. Jarrett

A precise high resistance comparison was performed between the traveling dual source bridge developed by the National Metrology Institute of Japan (NMIJ) and the Adapted Wheatstone Bridge of the National Institute of Standards and Technology (NIST) from 10

ESTABLISHING TRACEABILITY WITH A GPS DISCIPLINED OSCILLATOR/CLOCK (GPSDO/GPSDC); A PRELIMINARY REPORT

October 24, 2022

Author(s)

Andrew Novick, Michael A. Lombardi

The metrological definition of traceability for a GPSDO or GPSDC requires an unbroken series of measurements to a national standard, with known uncertainties at each step. The calibrations must be end-to-end, including the antenna and cabling. While

Calculation of magnetic forces and torques on the Kibble coil

October 22, 2022

Author(s)

Stephan Schlamminger, Lorenz Keck, Frank Seifert, Leon Chao, Darine El Haddad, Shisong Li

Analytically the force and torques on a coil in a field of magnetic flux density can be calculated one of two ways. The line integral can be conducted along the coil's wire, summing up the differential force contribution. For each differential line segment

2022 NCWM-NIST National Survey on 20 lb LPG (Propane) Cylinders

October 19, 2022

Author(s)

David Sefcik, Katrice Lippa, N. Alan Heckert, Stephen Benjamin, Ivan Hankins, Don Onwiler

The National Conference on Weights and Measures (NCWM) in partnership and cooperation with the NIST Office of Weights and Measures (OWM) and the Weights and Measures Divisions of select U.S. States initiated the 2022 National Survey on 20 lb LPG (Propane)

Accurate Nanoparticle Size Determination using Electrical Mobility Measurements in the Step and Scan Modes

October 12, 2022

Author(s)

Kaleb Duelge, George Mulholland, Vincent A. Hackley, Michael Zachariah

A critical and extensive comparison was made between differential mobility analysis (DMA) measurements of the mean diameter of monodisperse gold nanoparticles (AuNP), based on step-voltage mode and the more commonly used scan-voltage mode (commercially

Status and Gaps in Thermodynamic Metrology of Materials in Extreme Environments

October 6, 2022

Author(s)

Elizabeth Rasmussen

Characterization and alignment of the flexure mechanism for the new Kibble balance at NIST

October 1, 2022

Author(s)

Lorenz Keck, Frank Seifert, David B. Newell, Rene Theska, Darine El Haddad

A quantum electro-mechanical metrology suite (QEMMS) is being built at the National Institute of Standards and Technology (NIST). As the first instrument in his class, the QEMMS combines all three, a programmable Josephson voltage system, a quantum Hall

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