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Displaying 326 - 350 of 5216

Mode-locked Fiber Laser's Repetition Frequency Stabilization using a Low-cost FPGA board

February 15, 2022

Author(s)

Dipen Barot, Ari Feldman, Brian Washburn

We demonstrate repetition frequency stabilization of a mode-locked laser using a FPGA board and open-source software. The stabilized repetition frequency exhibited low timing jitter and an Allan variance of 8×10-12 at 100 s gate time.

Characterizing Frequency Stability Measurements having Multiple Data Gaps

February 2, 2022

Author(s)

David A. Howe, Noah Schlossberger

Time series measurements with data gaps (dead times) prevent accurate computations of frequency variances such as the Allan variance (AVAR) and its square-root ADEV. To extract frequency distributions, data must be sequentially ordered and equally spaced

Charpy Key Comparison SIM.M.F-S3 - Instrumented Charpy Tests on Low- and High-Energy Specimens - Final Report

February 1, 2022

Author(s)

Enrico Lucon, Renato Reis Machado

This report describes a CIPM Key Comparison through the SIM/MWG-7 organization, concerning instrumented impact testing of low-energy (20 J) and high-energy (100 J) Charpy V-notch specimens. In this Comparison, various instrumented and non-instrumented data

New reference materials for trace-levels of actinide elements in plutonium

January 27, 2022

Author(s)

Richard Essex, Lav Tandon, Amy Gaffney, Cole Hexel, Debbie Bostick, Lisa Colletti, Diana Decker, Casey Finstad, Joseph Giaquinito, Elmer Lujan, John Partridge, Benjamin Roach, John Rolinson, Kyle Samperton, Alice Slemmons, Khalil Spencer, Floyd Stanley, Lisa Townsend, Kerri Treinen, Ross Williams, Christopher Worley

Two plutonium oxides were prepared as unique reference materials for actinides occurring as trace constituents in Pu. Each reference material unit is approximately 200 mg of PuO2 in a quartz glass vial. Characterized attributes of the oxides included mass

ASME B89.4.23 Performance Evaluation Tests and Geometry Errors in X-Ray Computed Tomography Systems

January 20, 2022

Author(s)

Bala Muralikrishnan, Meghan Shilling, Vincent Lee

A documentary standard produced by the American Society of Mechanical Engineers (ASME) for performance evaluation of industrial X-ray computed tomography (XCT) systems for dimensional measurements was released in early 2021. This standard, ASME B89.4.23

Quantitative Determination of Cell Viability Using Absorbance Microscopy

January 19, 2022

Author(s)

Greta Babakhanova, Stephen Zimmerman, Laura Pierce, Sumona Sarkar, Nicholas Schaub, Carl Simon Jr.

Cell viability is an essential measurement for cell therapy products. One of the most common tests is Trypan blue (TB) dye exclusion where blue-stained cells are counted via imaging. Typically, live and dead cells are counted based on pixel intensities of

Multi-Source Common-View Disciplined Clock: A Fail-Safe Clock for Critical Infrastructure Systems

January 10, 2022

Author(s)

Michael A. Lombardi

The multi-source common-view disciplined clock (MSCVDC) is a recent NIST invention designed to support critical infrastructure timing systems that require a verifiably accurate and fail-safe clock. This paper introduces the MSCVDC, provides a technical

A Comprehensive Analysis and Performance Enhancements for the IEEE 802.11ay Group

January 4, 2022

Author(s)

Tanguy Ropitault

Millimeter-wave technology provides the necessary improvements in capacity and performance for the next generation of wireless networks. The new IEEE 802.11ay amendment extends IEEE 802.11ad to offer 100 Gbps connectivity in the unlicensed 60 GHz band

AbsorbanceQ: An App for Generating Absorbance Images from Brightfield Images

January 4, 2022

Author(s)

Stephen Zimmerman, Carl Simon Jr., Greta Babakhanova

The AbsorbanceQ app converts brightfield microscope images into absorbance images that can be analyzed and compared across different operators, microscopes and time. Absorbance-based measurements are comparable, which is useful when the aim is to

Measurement Matters, OWM Newsletter, Vol. 11, Issue 3, July 2021

January 4, 2022

Author(s)

David Sefcik, Elizabeth Benham, Shelby Bowers, Kenneth S. Butcher, Micheal Hicks, Douglas A. Olson

Specifications and Tolerances for Reference Standard and Field Standard Weights and Measures

January 4, 2022

Author(s)

Georgia L. Harris, Micheal Hicks

Handbook 105-2 is part of the Handbook 105-series of specifications and tolerances identified in NIST Handbooks 44, 130, and 133 for use as field standards in weights and measures enforcement actions. This handbook covers the specifications and tolerances

Comparison of a 100 pF Capacitor with a 12906 O Resistor Using a Hybrid Impedance Bridge

December 31, 2021

Author(s)

Mona Feige, Stephan Schlamminger, Andrew D. Koffman, Dean G. Jarrett, Shamith Payagala, Alireza Panna, Bryan C. Waltrip, Michael Berilla, Frank Seifert, Yicheng Wang

Calibration of Triaxial Accelerometers by Constant Rotation in the Gravitational Field

December 13, 2021

Author(s)

Michael Gaitan, Jon Geist

We extend the use of the intrinsic properties calibration method for triaxial accelerometers that we reported earlier from discrete angular steps to using a constant rotation rate to produce a time varying excitation in the earth's gravitational field. We

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