Leon Chao

Publications

The Design and Development of a Tabletop Kibble Balance at NIST

May 23, 2019

Author(s):

Leon S. Chao, Frank C. Seifert, Darine El Haddad, Julian Stirling, David B. Newell, Stephan Schlamminger

On November 16, 2018, the 26th General Conference on Weights and Measures (CGPM) voted unanimously to revise the International System of Units (SI) from a...

The Design and Development of a Tabletop Kibble Balance at NIST

March 20, 2019

Author(s):

Leon S. Chao, Frank C. Seifert, Darine El Haddad, Stephan Schlamminger

A global paradigm shift to redefine the International System of Units (SI) from a system based on seven fundamental units to seven fundamental constants is...

First measurements of the flux integral with the new NIST-4 watt balance

March 31, 2015

Author(s):

Darine El Haddad, Frank C. Seifert, Leon S. Chao, Yusi A. Cao, Georgio A. Sineriz, Jon R. Pratt, David B. Newell, Stephan Schlamminger

In early 2014, construction of a new watt balance, named NIST-4, has started at the National Institute of Standards and Technology (NIST). In a watt balance,...

A summary of the Planck constant measurements using a watt balance with a superconducting solenoid at NIST

February 05, 2015

Author(s):

Stephan Schlamminger, Richard L. Steiner, Darine El Haddad, David B. Newell, Frank C. Seifert, Leon S. Chao, Ruimin Liu, Edwin R. Williams

Researchers at the National Institute of Standards and Technology have been using a watt balance, NIST-3, to measure the Planck constant h for over ten years...

A determination of the local acceleration of gravity for the NIST-4 watt balance

January 21, 2015

Author(s):

David B. Newell, Eric J. Leaman, Darine El Haddad, Frank C. Seifert, Leon S. Chao, Yusi A. Cao, Jon R. Pratt, Stephan Schlamminger

A new watt balance is being constructed at the National Institute of Standards and Technology in preparation for the redefinition of the International System...