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Displaying 151 - 175 of 5220

An Evolving Regulatory Landscape for Commercial Electric Vehicle Fueling

August 22, 2023
Author(s)
Tina G. Butcher, Michael Nelson
Plug-in electric vehicles (PEV), which include "all-electric" battery EV (BEV) and plug-in hybrid EV (PHEV), comprise a rapidly growing proportion of the U.S. automobile market – nearly 8% of all light-duty vehicles sold in Oct. 2022, a 41.4% rise over

Fabrication of Specimens for Atom Probe Tomography using a Combined Gallium and Neon Focused Ion Beam Milling Approach

August 16, 2023
Author(s)
Frances Allen, Paul Blanchard, David Pappas, Russell Lake, Deying Xia, John Notte, Ruopeng Zhang, Andrew Minor, Norman A. Sanford
We demonstrate a new focused ion beam sample preparation method for atom probe tomography. The key aspect of the new method is that we use a neon ion beam for the final tip shaping after conventional annulus milling using gallium ions. This dual-ion

Measuring the permittivity tensor of anisotropic DyScO3 to 110 GHz

August 14, 2023
Author(s)
Florian Bergmann, Meagan Papac, Nick Jungwirth, Bryan Bosworth, Tomasz Karpisz, Anna Osella, Lucas Enright, Eric Marksz, Angela Stelson, Chris Long, Nate Orloff
DyScO3 (DSO) is an attractive substrate on which to grow epitaxial thin films with extraordinary materials physics. However, its highly anisotropic permittivity makes some measurements exceedingly difficult: For instance, its permittivity tensor has not

Recommendations for Setting a Criterion for Assessing Commutability of Secondary Calibrator Certified Reference Materials

August 11, 2023
Author(s)
W. Greg Miller, Thomas Keller, Jeffrey Budd, Jesper Johansen, Mauro Panteghini, Neil Greenberg, Vincent Delatour, Ferruccio Ceriotti, Robert Rej, Johanna Camara, Liesbet Deprez, Finlay MacKenzie, Alicia Lyle, Eline van der Hagen, Chris Burns, Pernille Fauskanger, Sverre Sandberg
A secondary higher-order calibrator is required to be commutable with clinical samples to be suitable for use in the calibration hierarchy of an end-user clinical laboratory in vitro diagnostic medical device (IVD-MD). Commutability is a property of a

Accurate measurement of the loss rate of cold atoms due to background gas collisions for the quantum-based cold atom vacuum standard

August 1, 2023
Author(s)
Daniel Barker, James A. Fedchak, Jacek Klos, Julia Scherschligt, Abrar Sheikh, Eite Tiesinga, Stephen Eckel
We present measurements of thermalized collisional rate coefficients for ultra-cold $^7$Li and $^87}$Rb colliding with room-temperature He, Ne, N$_2$, Ar, Kr, and Xe. In our experiments, a combined flowmeter and dynamic expansion system, a vacuum metrology

Non-nulling Protocols for Fast, Accurate, 3-D Velocity Measurements in Stacks

July 28, 2023
Author(s)
Iosif Isaakovich Shinder, Aaron Johnson, James Filla, Vladimir B. Khromchenko, Michael R. Moldover, Joey Boyd, John D. Wright, John R. Stoup
We present protocols for making fast, accurate, 3-D velocity measurements in the stacks of coal-fired power plants. The measurements are traceable to internationally-recognized standards; therefore, they provide a rigorous basis for measuring and/or

2023 NIST OWM S&T Analysis

July 7, 2023
Author(s)
Lisa Warfield, Loren Minnich, Jan Konijnenburg, Gloria Diane Lee, Juana Williams
The NIST OWM Analysis is submitted to assist the Weights and Measures community as it deliberates on items before the 2023 NCWM Annual Conference. NIST OWM offers these comments and recommendations based upon information and input available as of the date

2023 OWM Annual Analysis

July 6, 2023
Author(s)
John McGuire, Lisa Warfield
The NIST OWM Analysis is submitted to assist the Weights and Measures community as it deliberates on items before the Conference. NIST OWM offers these comments and recommendations based upon information and input available as of the date of this report.

Cylindrical Acoustic Gas Thermometry

July 6, 2023
Author(s)
Li Xing, X.J. Feng, Ming-Hao Si, Jintao Zhang, Hong Lin, Keith Gillis, Michael Moldover
We review recent determinations of the Boltzmann constant kB and the differences T-T90 that used cylindrical acoustic gas thermometry (c-AGT). These determinations measured the acoustic resonances frequencies of argon gas enclosed by metal-walled

Operando photoelectron spectromicroscopy of nanodevices: Correlating the surface chemistry and transport in SnO2 nanowire chemiresistors

June 29, 2023
Author(s)
Andrei Kolmakov, Trey Diulus, Kurt D. Benkstein, Stephen Semancik, Majid Kazemian, Matteo Amati, Maya Kiskinova, Luca Gregoratti
With size reduction of active elements in microelectronics to tens of nanometers and below, the effect of surface and interface properties on overall device performance becomes crucial. High resolution spectroscopic and imaging techniques provide a

Laser tracker interim testing per the ASME B89.4.19-2021 and ISO 10360-10:2021 standards

June 28, 2023
Author(s)
Marcos Motta de Souza, Bala Muralikrishnan, Vincent Lee, Daniel S. Sawyer
The recently revised ASME B89.4.19-2021 and ISO 10360-10:2021 standards for laser trackers include a new interim test that is comprehensive and more sensitive to systematic errors than the interim tests in the previous versions of the standards, i.e., the

2022 NIST Summary of U.S. Legal Metrology Activities

June 20, 2023
Author(s)
Lisa Warfield, Tina G. Butcher, Richard A. Harshman, Jan Konijnenburg, Gloria Diane Lee, David Sefcik, Juana Williams, Katrice Lippa
The NIST Office of Weights and Measures (OWM) presents its first report 2022 NIST Annual Summary of U.S. Legal Metrology Activities report. This report includes a summary of changes made to NIST Handbook 44 (2021) Specifications, Tolerances and Other
Displaying 151 - 175 of 5220
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