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NIST Authors in Bold

Displaying 351 - 375 of 2957

Towards One-electron Ions in Rydberg States for Laser Spectroscopy

July 30, 2012
Author(s)
Joseph Tan, Samuel Brewer, Nicholas D. Guise
Simple quantum systems play important roles in the determination of fundamental constants. Very recently at NIST, bare nuclei created in an EBIT were extracted and captured in a novel compact Penning trap. This is a step towards production of one-electron

Redefinition of the Kilogram: A Decision Whose Time Has Come

April 1, 2005
Author(s)
I M. Mills, Peter Mohr, T J. Quinn, Barry Taylor, Edwin R. Williams
The kilogram, the base unit of mass in the International System of Units (SI), is defined as the mass m(K) of the international prototype of the kilogram. This definition has the effect of fixing the value of m(K) to be one kilogram exactly. In this paper

Practical Aspects of Acoustic Emission Source Location by a Wavelet Transform

January 1, 2003
Author(s)
Marvin A. Hamstad, K S. Downs, Agnes O'Gallagher
An algoithmic approach to improve the accuracy of AE source location was demonstrated by using a large database of wideband-acoustic-emission-(AE)-modeled signals and wavelet transform (WT) results. The AE-signal database was created by a three-dimentional

Microscale Heat Transfer at Low Temperatures

September 26, 2005
Author(s)
Ray Radebaugh
… This paper discusses the fundamentals and applications of heat transfer in small space … Microscale Heat Transfer Fundamentals and Applications …

Internal and external harmonics in bi-cyclide coordinates

July 20, 2023
Author(s)
Hans Volkmer, Brandon Alexander, Howard Cohl
The Laplace equation in three-dimensional Euclidean space is R-separable in bi-cyclide coordinates leading to harmonic functions expressed in terms of Lamé–Wangerin functions called internal and external bi-cyclide harmonics. An expansion for a fundamental

Planck Constant Determination from Power Equivalence

April 1, 2000
Author(s)
David B. Newell
Equating mechanical to electrical power links the kilogram, the meter, and the second to the practical realizations of the ohm and the volt derived from the quantum Hall and the Josephson effects, yielding an SI determination of the Planck constant. The

High Temperature Superconductor Wires and Tapes

November 26, 2006
Author(s)
M. P. Paranthaman, V Selvamanickam, K Matsumoto, Luigia Gianna, Wei-xian Zhang, P Goyal, Winnie Wong-Ng
High Temperature Superconductor Wires and Tapes was one of the MS&T2006 symposia (October 15-19, 2006; Duke Energy Center, Cincinnati, Ohio) that covered recent advances in the area of high temperature superconductor (HTS) wires and tapes. The symposium

Dielectric loss extraction for superconducting microwave resonators

May 5, 2020
Author(s)
Corey Rae H. McRae, Russell Lake, Junling Long, Mustafa Bal, Xian Wu, Battogtokh Jugdersuren, Thomas Metcalf, Xiao Liu, David P. Pappas
The investigation of two-level-state (TLS) loss in dielectric materials and interfaces remains at the forefront of materials research in superconducting quantum circuits. We demonstrate a method of TLS loss extraction of a thin film dielectric by measuring

Adopting the International System of Units to the 21st century

March 1, 2011
Author(s)
Peter J. Mohr, Ian M. Mills, Terry Quinn, Barry N. Taylor, Edwin R. Williams
We review the proposal of the International Committee for Weights and Measures (CIPM), currently being considered by the General Conference on Weights and Measures (CGPM), to revise the International System of Units, the SI. The proposal includes new

Physics Laboratory Technical Activities 1998

January 1, 1999
Author(s)
K B. Gebbie
This report summarizes research projects measurement method developments, calibration and testing services, and data evaluation activities that were carried out during calendar year 1998 in the NIST Physics Laboratory. These activities are in the areas of

New measurement of the Boltzmann constant k by acoustic thermometry of helium-4 gas

September 11, 2017
Author(s)
Laurent Pitre, Fernando Sparasci, Michael R. Moldover, Cecile Guianvarch, Catherine Martin, Martin Himbert, Mark Plimmer, James B. Mehl, Giuliano Albo, Bo Gao, Lara Risegari
The SI unit of temperature will soon be redefined in terms of a fixed value of the Boltzmann constant k derived from an ensemble of measurements worldwide. We report on a new determination of k using acoustic thermometry of helium-4 gas in a 3-litre quasi

Optimization of Confined DART-MS

February 14, 2020
Author(s)
Edward R. Sisco, Matthew E. Staymates, Thomas P. Forbes
… DART-MS, Mass Spectrometry, Ambient Ionization, Fundamentals, Visualization …
Displaying 351 - 375 of 2957
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