Realizations of the triple points of carbon dioxide and sulfur hexafluoride-ITS-90 temperature determinations and interpolations [0.03%]
二氧化碳和六氟化硫三相点的实现及其ITS-90温度确定与插值计算
Klaus N Quelhas,Richmond S Wang,Andrea Peruzzi et al.
Klaus N Quelhas et al.
The triple points of carbon dioxide (TP CO2) and sulfur hexafluoride (TP SF6) have been studied over the last decade as alternative fixed points to the triple point of mercury (TP Hg, 234.3156 K) on the International Temperature Scale of 19...
Companion guide to the revised technical guidelines for reliable dc measurements of the quantized Hall resistance for graphene-based devices [0.03%]
石墨烯器件量子霍尔电阻分级测量技术指南辅助手册
Consultative Committee for Electricity and Magnetism;Task Group on Graphene Quantum Hall Resistance Standards;Albert F Rigosi,Hansjörg Scherer,Mathieu Taupin et al.
Consultative Committee for Electricity and Magnetism;Task Group on Graphene Quantum Hall Resistance Standards;Albert F Rigosi et al.
This companion guide revises and expands upon the established technical guidelines for reliable direct current measurements of the quantized Hall resistance, adapting them to the unique characteristics of epitaxial graphene. Graphene has em...
Low-Frequency Calibration of Accelerometers by Rotation in the Gravitational Field at NIST [0.03%]
国家标准技术研究院(NIST)重力场中旋转加速度计的低频标定
Jared H Strait,Richard A Allen,Michael Gaitan
Jared H Strait
We present a low-frequency accelerometer calibration system based on rotation in the gravitational field. Example characterizations of three accelerometers from (0.01 to 1.5) Hz with an uncertainty analysis demonstrate k = 2 magnitude and p...
Holly Leopardi,Kyle Beloy,Tobias Bothwell et al.
Holly Leopardi et al.
We perform absolute measurement of the 27Al+ single-ion and 87Sr neutral lattice clock frequencies at the National Institute of Standards and Technology and JILA at the University of Colorado against a global ensemble of primary frequency s...
Leveraging the revised International System of Units: torque from the fundamental constants [0.03%]
利用修订后的国际单位制：从基本常数获得力矩
Zane Comden,Stephan Schlamminger,Frank Seifert et al.
Zane Comden et al.
Calibration of tools designed to apply known torques, such as torque wrenches and torque screwdrivers, requires a chain of traceable standards to the definition of the kilogram and meter derived from the revised International System of Unit...
Uncertainty of the measurement of the frequency dependence of four-terminal pair capacitance with a four-channel vector network analyzer [0.03%]
四端口矢量网络分析仪频率相关四端子电容测量的不确定度
Stephan Schlamminger,Andrew Koffman,Yicheng Wang
Stephan Schlamminger
We recently overhauled the calibration service for the frequency dependence of four-terminal pair air capacitors provided by the National Institute of Standards and Technology to its customers. In the past, the calibration was performed wit...
Primary activity measurement of an Am-241 solution using microgram inkjet gravimetry and decay energy spectrometry [0.03%]
利用微克级喷墨称重法和衰变能量光谱法测量 americium-241 溶液的主要活度
Ryan P Fitzgerald,Bradley K Alpert,Denis E Bergeron et al.
Ryan P Fitzgerald et al.
We demonstrate a method for radionuclide assay that is spectroscopic with 100 % counting efficiency for alpha decay. Advancing both cryogenic decay energy spectrometry (DES) and drop-on-demand inkjet metrology, a solution of Am-241 was assa...
Christopher J Crowley,Iosif I Shinder,Michael R Moldover et al.
Christopher J Crowley et al.
Laser Doppler anemometers (LDAs) use scattered light to determine velocity components of a flowing fluid. The operating principal of LDAs is simple conceptually; however, it is impractical to trace the LDA-determined velocities to the SI by...
Jared H Strait,Richard A Allen
Jared H Strait
We present an optical scheme to simultaneously characterize the cross-axis and rotational parasitic motions of a long-stroke shaker. By leveraging the geometric properties of a corner cube retroreflector mounted on the shaker load table, we...
Practical realization of the watt from Planck's constant using radiation pressure [0.03%]
基于普朗克常数利用辐射压力实现瓦特的实际化
Brian J Simonds,Kyle A Rogers,Sven Schulze et al.
Brian J Simonds et al.
A primary force standard is implemented to realize the watt through Planck's constant by means of radiation pressure at the kilowatt level. The high amplification laser-pressure optic, or HALO, is a multiple reflection radiation pressure ap...