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Displaying 501 - 525 of 1513

10 T? and 100 T? Resistance Comparison between NIST and AIST

July 9, 2018
Author(s)
Dean G. Jarrett, Takehiko Oe, Nobu Kaneko, Shamith U. Payagala
We report the results of a comparison of 10 TΩ and 100 TΩ high resistance standards between the National Institute of Standards and Technology (NIST) and the National Institute for Advanced Industrial Science and Technology (AIST). Three standard resistors

Transport of NIST Graphene Quantized Hall Devices and Comparison with AIST Gallium-Arsenide Quantized Hall Devices

July 9, 2018
Author(s)
Dean G. Jarrett, Takehiko Oe, Randolph E. Elmquist, Nobu Kaneko, Albert F. Rigosi, Bi Y. Wu, Hsin Y. Lee, Yanfei Yang
We report the results of a pilot study where two graphene quantized Hall resistance (QHR) devices made at the National Institute of Standards and Technology (NIST) were hand carried from the USA to the National Institute for Advanced Industrial Science and

Measurement of Leakage Current to Ground in Programmable Josephson Voltage Standard

July 8, 2018
Author(s)
Alain Rufenacht, Charles J. Burroughs, Paul D. Dresselhaus, Samuel P. Benz
The voltage error associated with the leakage current of programmable Josephson voltage standards (PJVS) is one of the largest contributions to the uncertainty in direct comparison of voltage standards. Due to the parallel biasing scheme of the PJVS and

Uncertainty of the Ohm Using Cryogenic and Non-Cryogenic Bridges

July 8, 2018
Author(s)
Alireza Panna, Marlin E. Kraft, Albert Rigosi, George R. Jones Jr., Shamith Payagala, Mattias Kruskopf, Dean G. Jarrett, Randolph Elmquist
We describe recent scaling measurements to decade resistance levels based on both cryogenic and non-cryogenic current comparator bridges. National measurement institutes and the International Bureau of Weights and Measures derive traceability for the SI

Walk-through Metal Detector Testing and the Need to Emulate Natural Body Motion

July 5, 2018
Author(s)
Nicholas G. Paulter Jr., Donald R. Larson, Nicklaus F. Troje
The effect of motion through the portal of a walk-through metal detector (WTMD) has often been considered to contribute to the uncertainty in detecting threat objects being carried through the WTMD. However, typical metrological testing uses a robotic

Towards Developing Standardized Usability Evaluation Methodology for Public Safety Communications Technology: A User-Centered Approach

June 14, 2018
Author(s)
Kristen Greene, Shanee T. Dawkins, Yee-Yin Choong, Mary F. Theofanos, Sandra S. Prettyman, Susanne M. Furman, Michelle P. Steves
In public safety and homeland security, it is critical to understand technology users’ primary goals, the characteristics of the users, and the context in which they are operating. New and emerging technologies present opportunities and challenges for

Metrology for stable isotope reference materials: 13C/12C and 18O/16O isotope ratio value assignment of pure carbon dioxide gas samples on the Vienna PeeDee Belmnite-CO2 scale using dual-inlet mass spectrometry

May 25, 2018
Author(s)
Abneesh Srivastava, R M. Verkouteren
Isotope ratio measurements have been conducted on a series of isotopically distinct pure CO2 gas samples using the technique of dual-inlet isotope ratio mass spectrometry (DI-IRMS). The influence of instrumental parameters, data normalization schemes on

Technical Review of NISTs Free Standard Reference Data Products

April 9, 2018
Author(s)
Debra L. Kaiser, Robert J. Hanisch
Over the past two years, the ODI has undertaken an ambitious effort to modernize the SRD Program. This report covers one aspect of this modernization effort, a comprehensive internal technical review of the 75 free data products currently carrying the SRD

Virtual Metrology White Paper - INTERNATIONAL ROADMAP FOR DEVICES AND SYSTEMS(IRDS)

April 9, 2018
Author(s)
Ndubuisi G. Orji, Yaw S. Obeng, Carlos Beitia, Supika Mashiro, James Moyne
This white paper provides an overview of virtual metrology (VM) and the benefits it can provide, with cost reduction (both capital expenditure and cycle time) being the primary benefit. The white paper also examines some of the issues preventing wider

Errors in Rate of Rise Gas Flow Measurements from Flow Work

March 20, 2018
Author(s)
John D. Wright, Aaron Johnson, Gina Kline, Michael R. Moldover
The rate of rise (RoR) method measures the time rate of change of the mass of gas in a collection volume as it is filled via a flow meter under test. The mass of gas is calculated from time-stamped pressure and temperature data gathered from the known
Displaying 501 - 525 of 1513
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