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Search Publications by: David B. Newell (Fed)

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Displaying 126 - 150 of 167

CODATA recommended values of the fundamental physical constants: 2006

April 1, 2008
Author(s)
Peter J. Mohr, Barry N. Taylor, David B. Newell
The paper give the 2006 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on data for Science and Technology (CODATA) for international use. Further, it describes in detail the

Precision and Accuracy of Thermal Calibration of Atomic Force Microscopy Cantilevers

January 1, 2006
Author(s)
G A. Matei, E J. Thoreson, Jon R. Pratt, David B. Newell, N A. Burnham
To have confidence in force measurements made with atomic force microscopes (AFMs), the spring constant of the AFM cantilevers should be known with good precision and accuracy, topics not yet thoroughly treated in the literature. In this study, we compared

Progress Towards SI Traceable Force Metrology for Nanomechanics

January 1, 2004
Author(s)
David B. Newell, Eric P. Whitenton, John A. Kramar, Jon R. Pratt, Douglas T. Smith
This paper is based, in its entirety, on NIST-approved publications: Calibration of Piezoresistive Cantilever Force Sensors Using the NIST Electrostatic Force Balance, The NIST Electrostatic Force Balance Experiment, The NIST Microforce Realization and

Progress Towards Systeme International d'Unites Traceable Force Metrology for Nanomechanics

January 1, 2004
Author(s)
Jon R. Pratt, Douglas T. Smith, David B. Newell, John A. Kramar, Eric P. Whitenton
Recent experiments with the National Institute of Standards and Technology (NIST) Electrostatic Force Balance (EFB) have achieved agreement between an electrostatic force and a gravitational force of 10^(-5) N to within a few hundred pN/¿N. This result

The NIST Microforce Realization and Measurement Project

April 1, 2003
Author(s)
David B. Newell, Edwin R. Williams, John A. Kramar, Jon R. Pratt, Douglas T. Smith
The National Institute of Standards and Technology (NIST) has launched a five-year Micro-force Realization and Measurement project focusing on the development of an instrument and laboratory capable of realizing and measuring the SI unit of force below

Probe-Force Calibration Experiments Using the NIST Electrostatic Force Balance

January 1, 2003
Author(s)
Jon R. Pratt, David B. Newell, John A. Kramar, J Mulholland, Eric P. Whitenton
The sensitivity of a piezoresistive cantilever force sensor has been determined by probing the weighing pan of the NIST prototype electrostatic force balance. In this experiment, micronewton contact forces between a force probe and the balance''s weighing

The NIST Microforce Realization and Measurement Project

June 1, 2002
Author(s)
David B. Newell, Jon R. Pratt, John A. Kramar, Douglas T. Smith, Edwin R. Williams
The National Institute of Standards and Technology (NIST) has launched a five-year Microforce Realization and Measurement project focusing on the development of an instrument and laboratory capable of realizing and measuring the SI unit of force below

The NIST Microforce Realization and Measurement Project

June 1, 2002
Author(s)
David B. Newell, Jon R. Pratt, John A. Kramar, Douglas T. Smith, Edwin R. Williams
The National Institute of Standards and Technology (NIST) has launched a five-year Micro-force Realization and Measurement project focusing on the development of an instrument and laboratory capable of realizing and measuring the SI unit of force below

NIST Electrostatic Force Balance Experiment

January 1, 2002
Author(s)
John A. Kramar, David B. Newell, Jon R. Pratt
We have designed and built a prototype electrostatic force balance for realizing forces in the micronewton range. The active electrodes are concentric cylinders, the outer serving as the reference and the inner suspended and guided by a rectilinear flexure

SI Traceability of Force at the Nanonewton Level

July 1, 2001
Author(s)
David B. Newell, Jon R. Pratt, John A. Kramar, Douglas T. Smith, L. A. Feeney, Edwin R. Williams
Although nanonewton force measurements are commonplace in industry, no National Measurement Institute supports a link to the International System of Units (SI) below one newton. The National Institute of Standards and Technology has launched a five-year

Towards a Traceable Nanoscale Force Standard

May 1, 2001
Author(s)
Jon R. Pratt, David B. Newell, Edwin R. Williams, Douglas T. Smith, John A. Kramar
The National Institute of Standards and Technology has launched a five-year project to traceably link the International System of Units (SI) to forces between 10 -8N and 10 -2N. In this paper, we give a background and overview of this project, discuss the

Hysteresis and Related Error Mechanisms in the NIST Watt Balance Experiment

February 16, 2001
Author(s)
J. Schwarz, Ruimin Liu, David B. Newell, Richard L. Steiner, Edwin R. Williams, Douglas T. Smith, A Erdemir, J Woodford
The NIST Watt Balance experiment is being completely rebuilt after its 1998 determination of the SI Volt and Planck's constant. That measurement yielded a result with approximately 1 x 10 -7 standard relative uncertainty. Because the goal of the new

SI Traceability of Force at the Nanonewton Level

January 1, 2001
Author(s)
David B. Newell, Jon R. Pratt, John A. Kramar, Douglas T. Smith, L Feeney, Edwin R. Williams
Although nanonewton force measurements are commonplace in industry, no National Measurement Institute supports a link to the International System of Units (SI) below one newton. The National Institute of Standards and Technology has launched a five-year

Reconstruction and Preliminary Tests of the NIST Electronic Kilogram Experiment

May 1, 2000
Author(s)
Richard L. Steiner, David B. Newell, J. Schwarz, Edwin R. Williams, Ruimin Liu
The NIST electronic kilogram experiment is being completely rebuilt into a vaccum chamber within a specially designed laboratory room. Major renovations include reference mass positioning equipment, structural alignment flexures, and a redesigned inductive

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

Watt's Up, Doc? The NIST Watt Experiment and the Future of the Kg

March 21, 2000
Author(s)
J. Schwarz, Ruimin Liu, David B. Newell, Richard L. Steiner, Edwin R. Williams
The Nist Watt Balance is an interesting and beautiful experiment housed in the nonmagnetic building behind the reactor. The underlying physical principles of the experiment are very simple: a current in a magnetic gradient will produce a force that is

Reference Standards, Uncertainties, and the Future of the NIST Electronic Kilogram

July 1, 1999
Author(s)
Richard L. Steiner, David B. Newell, J. Schwarz, Edwin R. Williams
The National Institute of Standards and Technology (NIST) watt balance experiment recently made a new determination of Planck's constant with a relative standard uncertainty of 87 x 10 -9 (k = 1), concurrently with an upper limit on the drift rate of the
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