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You searched on: Author: Zeina Kubarych

Displaying records 1 to 10 of 30 records.
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1. The dissemination of mass in the United States: Results and implications of recent BIPM calibrations of US National Prototype Kilograms
Series: Journal of Research (NIST JRES)
Report Number: 119.001
Published: 3/12/2014
Authors: Zeina Jabbour Kubarych, Patrick J Abbott
Abstract: The National Institute of Standards and Technology (NIST) is responsible for the dissemination of the unit of mass within the United States of America through the national prototype kilogram K20 and its check standard K4. These platinum-iridium ...

2. NIST 1-kilonewton sine force calibration system
Published: 1/22/2014
Authors: Akobuije Douglas Chijioke, Ricky Lee Seifarth, Zeina Jabbour Kubarych
Abstract: Many force-measurement applications are of a dynamic nature, and in recent decades there has been much progress in demonstrating and developing dynamic calibration systems for force transducers. The National Institute of Standards and Technology (NIS ...

3. The new kilogram definition and its implications for high-precision mass tolerance classes
Series: Journal of Research (NIST JRES)
Report Number: 118.016
Published: 8/26/2013
Author: Zeina Jabbour Kubarych
Abstract: The SI unit of mass, the kilogram, is the only remaining artifact definition in the seven fundamental quantities of the SI system. It will be redefined in terms of the Planck constant as soon as certain experimental conditions recommended by the ...

4. Calibration of dynamic sensors for noncontact-atomic force microscopy
Published: 8/12/2011
Authors: Gordon Allan Shaw, Jon Robert Pratt, Zeina Jabbour Kubarych
Abstract: Access to quantitative information on surface forces in noncontact-atomic force microscopy (NC-AFM) requires the accurate calibration of several key sensor parameters. This work outlines a dynamic method for calibrating the spring constant of tuning ...

5. Vacuum technology considerations for mass metrology
Published: 7/1/2011
Authors: Patrick J Abbott, Zeina Jabbour Kubarych
Abstract: Vacuum weighing of mass artifacts eliminates the necessity of air buoyancy correction and its contribution to the measurement uncertainty. Vacuum weighing is also an important process in the experiments currently underway for the redefinition of th ...

6. Small mass measurements for tuning fork-based force microscope cantilever spring constant calibration
Published: 6/7/2010
Authors: Gordon Allan Shaw, Jon Robert Pratt, Zeina Jabbour Kubarych
Abstract: Cutting edge mass sensors are capable of discriminating mass changes as small as several dozens of atoms, however the smallest mass commercially available from NIST with a calibration traceable to the International System of Units (SI) is 0.5 mg. To ...

7. Getting Closer to Redefining the Kilogram
Published: 10/30/2009
Author: Zeina Jabbour Kubarych
Abstract: A redefinition to replace the last remaining artifact based SI unit, the kilogram, may occur as early as 2011. This article presents a short summary of the status of current international efforts focused on the redefinition and the internationally a ...

8. Linking Air and Vacuum Mass Measurement by Magnetic Levitation
Published: 5/12/2009
Authors: Zeina Jabbour Kubarych, Patrick J Abbott, Edwin Ross Williams, Ruimin Liu, Vincent J Lee, Hung-Kung Liu
Abstract: This paper describes a new approach to directly link air and vacuum mass measurements using magnetic levitation techniques. This procedure provides direct traceability to national standards, presently defined in air, without requiring the estimate o ...

9. A magnetic levitation technique for the simultaneous comparison of mass artifacts in air and vacuum.
Published: 4/1/2009
Authors: Patrick J Abbott, Zeina Jabbour Kubarych, Ruimin Liu, Edwin Ross Williams, Joe Chalfoun
Abstract: We describe a mass comparison system in which a test mass artifact in air can be directly compared to a standard mass artifact in vacuum using the same high precision comparator balance. The system uses a magnetic levitation technique to couple the ...

10. Constant Pressure and Vacuum Transporter for 1 kg Mass Standards
Series: NIST Interagency/Internal Report (NISTIR)
Published: 9/8/2008
Authors: Vincent J Lee, Zeina Jabbour Kubarych
Abstract: This report describes the design and intended use of a constant pressure and vacuum transporter for transferring 1 kg mass standards between different locations and environments without compromising the atmospheric conditions and therefore maintainin ...

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