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End Effect Correction for Orthogonal Small Strain Oscillatory Shear in a Rotational Shear Rheometer

February 1, 2020

Author(s)

Ran Tao, Aaron M. Forster

The orthogonal superposition (OSP) technique is advantageous for measuring structural dynamics in complex fluids subjected to a primary shear flow. This technique superimposes a small amplitude oscillation orthogonal to a primary shear flow to measure the

Observation of an isomerizing double-well quantum system in the condensed phase

January 10, 2020

Author(s)

Varun Verma, Jascha A. Lau, Arnab Choudhury, Li Chen, Dirk Schwarzer, Alec M. Wodtke

Molecules are quantum objects; therefore, isomerization fundamentally involves quantum states bound within a molecular potential energy function with multiple minima. For isolated gas-phase molecules, eigenstates well above the isomerization saddle points

Collisions of room temperature helium with ultra-cold lithium and the van-der-Waals bound state of HeLi

January 6, 2020

Author(s)

Constantinos Makrides, Daniel Barker, James A. Fedchak, Julia Scherschligt, Stephen Eckel, Eite Tiesinga

We have computed the thermally-averaged total, elastic rate coefficient for the collision of a room-temperature helium atom with an ultra-cold lithium atom. This rate coefficient has been computed as part of the characterization of a cold atom vacuum

Quantifying protein aggregation kinetics using electrospray differential mobility analysis

January 5, 2020

Author(s)

Kaleb J. Duelge, Jeremie Parot, Vincent A. Hackley, Michael R. Zachariah

Protein aggregation is a significant concern in bioprocessing and end use applications. Here the thermal aggregation kinetics of bovine serum albumin (BSA) and α-chymotrypsinogen A (α- chymo) were measured over a range of concentrations and temperatures by

Calibration of free-space and fiber-coupled single-photon detectors

December 20, 2019

Author(s)

Thomas Gerrits, Alan L. Migdall, Joshua C. Bienfang, John H. Lehman, Sae Woo Nam, Jolene D. Splett, Igor Vayshenker, Chih-Ming Wang

We measure the detection efficiency of single-photon detectors at wavelengths near 851 nm and 1533.6 nm. We investigate the spatial uniformity of one free-space-coupled single-photon avalanche diode and present a comparison between fusion-spliced and

Practical Guide to the Design, Fabrication and Calibration of NIST Nanocalorimeters

December 16, 2019

Author(s)

Feng Yi, Michael D. Grapes, David A. LaVan

We report here on the design, fabrication and calibration of nanocalorimeter sensors used in the NIST Nanocalorimetry Measurements Project. These small scale thermal analysis instruments are produced using silicon microfabrication approaches. A single

Evaluating performance, degradation, and release behavior of a nanoform pigmented coating after natural and accelerated weathering

December 6, 2019

Author(s)

Ronald S. Lankone, David G. Goodwin, Li Piin Sung, Emmanuel Ruggiero, Klaus Vilsmeier, Philipp Mueller, Sorin Pulbere, Katie Challis, Yuqiang Bi, Paul Westerhoff, James Ranville, David H. Fairbrother, Wendel Wohlleben

Pigments with nanoscale dimensions are added to exterior coatings to achieve desirable color and gloss properties. The present study compared the performance, degradation, and release behavior of an acrylic coating that was pigmented by a nanoform of Cu

Checking the Net Contents of Packaged Goods (as adopted by the 104th National Conference on Weights and Measures 2019)

November 25, 2019

Author(s)

Breyanna M. Blackwell

This handbook has been prepared as a procedural guide for the compliance testing of net content statements on packaged goods. Compliance testing of packaged goods is the determination of the conformance of the- results of the packaging, distribution, and

Uniform Laws and Regulations in the Areas of Legal Metrology and Fuel Quality (as adopted by the 104th National Conference on Weights and Measures 2019)

November 25, 2019

Author(s)

Breyanna M. Blackwell

This handbook compiles the latest Uniform Laws and Regulations and related interpretations and guidelines adopted by the National Conference on Weights and Measures, Inc. (NCWM). At the 1983 Annual Meeting, the NCWM voted to change the title of Handbook

Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations

November 15, 2019

Author(s)

Martina Marzano, Mattias Kruskopf, Alireza Panna, Albert Rigosi, Dinesh K. Patel, Hanbyul Jin, Stefan Cular, Luca Callegaro, Randolph Elmquist, Massimo Ortolano

Establishing Standards and Methods for Qualification and Validation of New Particle Measurement Technologies

November 12, 2019

Author(s)

Srivalli Telikepalli, Dean C. Ripple, Kurt D. Benkstein, Kristen L. Steffens, Michael J. Carrier, Christopher B. Montgomery

Numerous particle sizing and counting methods exist for measuring particles in the submicrometer, subvisible, and visible size range. This article will briefly describe some key aspects that need to be considered for the most commonly used methods in order

Influence of Isotopologue Dipole Moments on Precision Dielectric-Constant Measurements

November 4, 2019

Author(s)

Allan H. Harvey

Measurements of the relative permittivity (dielectric constant) of fluids such as methane have been interpreted with the assumption that the substance has zero dipole moment. This assumption is not strictly true, due to the presence of isotopologues with

Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

October 31, 2019

Author(s)

Breyanna M. Blackwell

NIST Handbook 44 was first published in 1949, having been preceded by similar handbooks of various designations and in several forms, beginning in 1918. NIST Handbook 44 is published in its entirety each year following the Annual Meeting of the National

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