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Search Publications by: Jon R. Pratt (Fed)

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Displaying 151 - 175 of 230

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

SI Realization of Small Forces Using an Electrostatic Force Balance

January 1, 2006
Author(s)
Jon R. Pratt, John A. Kramar
We describe the realization of micronewton forces in a fashion consistent with the International System of Units (SI) using the National Institute of Standards and Technology (NIST) electrostatic force balance. A comparison between deadweight and

Use of Transfer Artifacts for Small Force Measurement

January 1, 2006
Author(s)
Gordon A. Shaw, Jon R. Pratt, Richard S. Gates, Mark Reitsma
In order for the atomic microscope (AFM) to be used in truly quantatitive studies, a basis within the international system of units (SI) must be established. In order to do this, the microfabricated cantilevers typically used for AFM force measurements

Development of Traceable Small Force Standards

June 1, 2005
Author(s)
Gordon A. Shaw, Jon R. Pratt
Although instrumented indentation and atomic forcve microscope (AFM) are utilized extensively for the measurement of forces in the piconewton to millinewton regime, accurate calibration of these forces remains an obstacle to quantitative research

Traceable Force Metrology for Micronewton Level Calibration

October 1, 2004
Author(s)
Jon R. Pratt, Richard Seugling
The research presented in this abstract concerns the calibration and implementation of a prototype secondary force standard to disseminate the SI (Syst?me International d''unit?s) unit of force ranging from 5.0 mN to 5.0 mN. The elastic-force measuring

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