A5049506774- Scientific Measurement and Uncertainty Evaluation
- Radioactive Decay and Measurement Techniques
- Sensor Technology and Measurement Systems
- Scientific Research and Discoveries
- Force Microscopy Techniques and Applications
- Advanced Sensor Technologies Research
- Advanced Optical Imaging Technologies
- Atomic and Molecular Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Cyclone Separators and Fluid Dynamics
- Chemical Thermodynamics and Molecular Structure
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Computability, Logic, AI Algorithms
- Surface Roughness and Optical Measurements
- Advancements in Photolithography Techniques
- Optical measurement and interference techniques
- Advanced MEMS and NEMS Technologies
- Electron Spin Resonance Studies
- Spectroscopy and Quantum Chemical Studies
- Mechanical and Optical Resonators
- Diverse scientific research topics
- Quantum Mechanics and Applications
- Digital Holography and Microscopy
- Probability and Statistical Research
National Institute of Standards and Technology
2012-2020
University of Catania
2019
Institute of Electrical and Electronics Engineers
2019
National Institute of Standards
2016-2017
Material Measurement Laboratory
2016
Although mass is typically defined within the International System of Units (SI) at kilogram level, pending SI redefinition provides an opportunity to realize any scale using electrical metrology.We propose use electromechanical balance milligram level units.An integrated concentric-cylinder vacuum gap capacitor allows us leverage highly precise references available for capacitance, voltage and length generate electrostatic reference force.Weighing experiments performed on 1 mg 20 artifacts...
Main text This report describes the second CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances x-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus serves as basis an internationally coordinated dissemination is updated after each new comparison. Its use will continue...
This report describes the first CCM key comparison of realizations kilogram definition based on fixed numerical value Planck constant, which came into force 20 May 2019. The objectives were to determine level agreement between using Kibble and joule balances X-ray crystal density (XRCD) method provide input for calculation "consensus value" kilogram. consensus will serve as basis an internationally coordinated dissemination continue until sufficient realization experiments has been achieved....
The definition of the kilogram in International System Units (SI) is expected to be revised 2018. present kilogram, mass Prototype Kilogram (IPK), adopted 1889, would then replaced by a based on fixed numerical value Planck constant. Consultative Committee for Mass and Related Quantities has requested that, as one essential steps before redefinition, comparison realizations future realization methods, Kibble9 balances x-ray crystal density (XRCD) experiments, organized.
This report describes a key comparison of 1?kg stainless steel mass standards, CCM.M-K4, undertaken by the Consultative Committee for Mass and Related Quantities (CCM) Working Group on Dissemination kilogram (WGD-kg). The CCM.M-K4 was launched during 12th meeting CCM (2010). aim present is to verify consistency standards among members CCM. previous carried out in 1995?1997 as CCM.M-K1 comparison. Bureau International des Poids et Mesures (BIPM) pilot laboratory this There were sixteen...
The SI unit of mass, the kilogram, is only remaining artifact definition in seven fundamental units system. It will be redefined terms Planck constant as soon certain experimental conditions, based on recommendations Consultative Committee for Mass and Related Quantities (CCM) are met. To better reflect reality, redefinition likely accompanied by an increase uncertainties that National Metrology Institutes (NMIs) pass to customers via dissemination, which could have impact reference...
On May 20, World Metrology Day 2019, the international system of units (SI) underwent a momentous change. The philosophy behind unit was altered by replacing former definitions that rely on seven base with defining physical constants to be used as basis for realizations units. Supported results from decades precise measurements, four new and fixed numerical values were assigned. In this article, we discuss significance change mass kilogram electrical ampere, volt, ohm.
The kilogram is the unit of mass in International System units (SI) and has been defined as Prototype Kilogram (IPK) since 1889. In future, a new definition will be realized by fixing value Planck constant. occur vacuum environment necessity, so National Institute Standards Technology (NIST) developing calibration system which artefact air can directly compared with environment. This apparatus uses magnetic suspension to couple high accuracy balance vacuum.
Experiments to realize the new definition of kilogram will be carried out in vacuum. NIST has developed a magnetic suspension mass comparator disseminate air. This paper details current status system. includes results from recent work characterize and improve performance portion A general overview system, as well key are given.
The National Institute of Standards and Technology (NIST) is responsible for the dissemination unit mass within United States America through national prototype kilogram K20 its check standard K4.These platinum-iridium artifacts have been in use since 1889 are periodically sent to International Bureau Weights Measures (BIPM) recalibration.The following a brief description roles kilograms America, implications NIST calibration customers most recent recalibrations K4.
The kilogram is the unit of mass in International System units (SI) and has been defined as Prototype Kilogram (IPK) since 1889. In future, a new definition will be based on precise measurements Planck constant. occur vacuum environment by necessity, so National Institute Standards Technology (NIST) developing calibration system which artifact air can directly compared with realized environment. This apparatus uses magnetic levitation to couple high precision balance vacuum. Technical...
The SI unit of mass, the kilogram, will be redefined in terms Planck constant, perhaps as soon 2018. A methodology for practical realization and dissemination new or Mise-en-Pratique (MeP), is progress within Consultative Committee Mass Related Quantities (CCM). kilogram realized a vacuum environment require transfer to air order maintain artifact mass metrology. NIST developing vacuum-to-air calibration system that uses magnetic suspension directly compare other gas. This method does not...
We report preparations underway at the National Institute of Standards and Technology (NIST) in United States Research Council (NRC) Canada to support redefinition international system units (SI) development a Mise en pratique for unit mass. NIST NRC possess two world's most precise moving coil watt balances are developing collaborative plan reconcile differences between respective measurement platforms by testing their ability mutually realize kilogram from Planck constant. The important...
On November 16 2018, about 60 countries met in Versailles, France and voted to redefine the System of Units (SI) based on seven defining reference constants. Since May 20 2019, unit mass is realized three fundamental constants: Planck constant h, speed light c, unperturbed ground state hyperfine transition frequency cesium 133 atom Δν <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Cs</sub> . With this new definition mass, scientists at National...
The International System of Units (SI) is expected to be revised in 2018, and this new system, the unit mass, kilogram, will realized a vacuum environment. In order transfer realization artifacts atmospheric pressure air, effects sorption contaminants must either corrected for or eliminated. NIST has constructed system that directly compares mass thereby eliminating need correction. We describe operation compare results those obtained from corrections.
The International System of Units (SI) will be redefined in 2018 so that the present seven SI base units are realized by a set defining constants having exact values. For unit mass, k...