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Displaying 826 - 850 of 2934

The Measurement of the Local Acceleration of Gravity for the NIST4 Watt Balance

August 24, 2014
Author(s)
David B. Newell, Jacques Liard, Leon S. Chao, Yusi A. Cao, Frank C. Seifert, Darine El Haddad, Jon R. Pratt, Stephan Schlamminger
A new watt balance is being constructed at NIST in preparation for the redefinition of the International System of Units and the realization of mass through an exact value of the Planck constant. We describe the procedures used and give results for the

Prospects for a New Cold Neutron Beam Measurement of the Neutron Lifetime

October 5, 2009
Author(s)
Maynard S. Dewey, Kevin J. Coakley, David M. Gilliam, G. Greene, A. Laptev, Jeffrey S. Nico, William M. Snow, F. E. Wiefeldt, A. Yue
In the most accurate cold neutron beam determination of the neutron lifetime based on the absolute counting of decay protons, the largest uncertainty was attributed to the absolute determination of the capture flux of the cold neutron beam. Currently an

Molar Mass and Related Quantities in the New SI

June 3, 2009
Author(s)
Barry N. Taylor
This Letter addresses the calculation of molar mass and related quantities in the New SI currently under discussion by the International Committee for Weights and Measures and its Consultative Committee for Units and which could be adopted by the next

A Reference Quality Equation of State for Nitrogen

July 1, 1998
Author(s)
R Span, Eric Lemmon, R. T. Jacobsen, Wolfgang Wagner
A new formulation describing the thermodynamic properties of nitrogen has been developed. New data sets are now available which have been used to improve the representation of the 0-0-T surface of gaseous, liquid and supercritical nitrogen, including the

Highly Reversible Zinc Metal Anode for Aqueous Batteries

June 1, 2018
Author(s)
Fei Wang, Oleg Borodin, Tao Gao, Xiulin Fan, Wei Sun, Fudong Han, Antonio Faraone, Joseph Dura, Kang Xu, Chunsheng Wang
… issues, caused by low coulombic efficiency (SE) of its plating/stripping in alkaline electrolytes, the growth of … retaining water in open atmosphere, promotes dendrite-free plating/stripping of Zn at nearly 100% CE. Such merits render …

Facility for Calibrating Heat Flu Sensors in a Convective Environment

January 1, 1997
Author(s)
David G. Holmberg, Kenneth D. Steckler, C A. Womeldorf, William L. Grosshandler
The National Institute of Standards and Technology (NIST) presently conducts heat flux sensor calibrations using standard radiation methods. In practice, however, many heat flux sensors are used in test environments where convective heat transfer dominates
Displaying 826 - 850 of 2934
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