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Metrology

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Displaying 1251 - 1275 of 2730

An Industrial Robotic Knowledge Representation for Kit Building Applications

October 12, 2012
Author(s)
Stephen B. Balakirsky, Zeid Kootbally, Craig I. Schlenoff, Thomas R. Kramer, Satyandra K. Gupta
The IEEE RAS Ontologies for Robotics and Automation Working Group is dedicated to developing a methodology for knowledge representation and reasoning in robotics and automation. As part of this working group, the Industrial Robots sub-group is tasked with

Current Compliance Circuit to Improve Variation in ON State Characteristics and to Minimize RESET Current

October 7, 2012
Author(s)
Pragya R. Shrestha, Adaku Ochia, Jason P. Campbell, Canute I. Vaz, Jihong Kim, Kin P. Cheung, Helmut Baumgart, Gary Harris
The wide distribution of ON and OFF values and high SET current in resistive memory is attributed to the high current overshoot during the SET process. In this paper we show a circuit which is capable of precisely limiting the current during SET process

Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime

October 2, 2012
Author(s)
Thomas Gerrits, Brice R. Calkins, Nathan A. Tomlin, Adriana E. Lita, Alan L. Migdall, Sae Woo Nam, Richard P. Mirin
Photon number resolving transition-edge sensors (TES) are the cutting-edge enabling technology for high quantum efficiency photon counting when the number of photons of an input state needs to be determined. The TES developed at NIST reliably show system

Characterization of Perchlorate in a New Frozen Human Urine Standard Reference Material

October 1, 2012
Author(s)
Lee L. Yu, William C. Davis, Rabia Oflaz, Gregory C. Turk, Jeff M. Jarrett, Liza Valentin, Benjamin C. Blount, Dennis D. Leber, Eric L. Kilpatrick
Perchlorate, an inorganic anion, has recently been recognized as an environmental contaminant by the U.S. Environmental Protection Agency (EPA). Assessment of human exposure to perchlorate requires measurement of the anion in urine. Although the

Faster, Better, Cheaper: New Automated Vacuum Calibration Service at NIST

October 1, 2012
Author(s)
Jacob E. Ricker, Jay H. Hendricks, Douglas A. Olson, Gregory F. Strouse
In today’s fast-paced world and ever expanding quality assurance requirements, the National Institute of Standards and Technology (NIST) has developed a system to fill the need for faster, better, and cheaper low pressure calibrations (0.65 Pa to 130 kPa)

Sequential Estimation of Timebase Corrections for an Arbitrarily Long Waveform

October 1, 2012
Author(s)
Chih-Ming Wang, Paul D. Hale, Jeffrey A. Jargon, Dylan F. Williams, Catherine A. Remley
We present a procedure for correcting the timebase distortion and jitter of temporal waveforms of arbitrary lengths. This is achieved by estimating the timebase distortion and jitter sequentially with overlapping measurements and using the information in

Variances of Cylinder Parameters Fitted to Range Data

September 26, 2012
Author(s)
Marek Franaszek
Industrial pipelines are frequently scanned with 3D imaging systems (e.g., LADAR) and cylinders are fitted to the collected data. Then, the fitted as-built model is compared with the as-designed model. Meaningful comparison between the two models requires

Concentration Measurement of Length-Fractionated Colloidal Single-Wall Carbon Nanotubes

September 20, 2012
Author(s)
Constantine Y. Khripin, Xiaomin X. Tu, John Howarter, Jeffrey A. Fagan, Ming Zheng
Determination of the colloid concentration for a given single-wall carbon nanotube (SWCNT) dispersion is a basic requirement for many studies. The commonly used optical absorption based concentration measurement is complicated by the spectral change due to

Program Handbook for Engine Fuel, Petroleum and Lubricant Laboratories

September 20, 2012
Author(s)
Kenneth S. Butcher
This handbook provides guidance to extablish a management system of State Fuel Quality Laboratories (FQL) using the International Organization for Standardization (ISO) International Electrotechnical Commission (IEC) ISO/IEC 17025:2005, "General

Factory Equipment Network Testing Framework: Concept, Requirements, and Architecture

September 17, 2012
Author(s)
James D. Gilsinn, Kang B. Lee, John L. Michaloski, Frederick M. Proctor, Yuyin Song
This document describes the purpose, concept, requirements, and architecture for the Factory Equipment Network Testing (FENT) Framework and the software to test equipment on real-time factory networks. Other documents contain more detailed information

Spin Dynamics in the Time and Frequency Domain

September 15, 2012
Author(s)
Thomas J. Silva
The current status of experimental approaches to analyze the spin wave dynamics in ferromagnetic nanoscale structures is reviewed. Recent developments in frequency- and field swept spectroscopy to determine the resonant response of nanoscale ferromagnets

Density and Speed of Sound Measurements of Four Bio-derived Fuels

September 13, 2012
Author(s)
Stephanie L. Outcalt, Tara J. Fortin
Compressed-liquid densities and ambient pressure densities and speeds of sound of four biomass-derived fuels have been measured. The compressed-liquid measurements were made from 270 K to 470 K, and 0.5 MPa to 50 MPa. The ambient pressure measurements were

FATIGUE CRACK GROWTH OF TWO X52 PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT

September 9, 2012
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Neha N. Rustagi, Damian S. Lauria, Joseph D. McColskey, Robert L. Amaro
Fatigue crack growth tests were conducted on two API 5L X52 pipeline steel alloys. One alloy was from a new linepipe that was installed for hydrogen service in 2011. The other alloy was from a vintage pipe that first saw natural gas service in 1964

Training Excellence: What Does Success Look Like?

August 28, 2012
Author(s)
Carol T. Hockert, Georgia L. Harris
The National Institute of Standards, Office of Weights and Measures has been working the last few years toward compliance with several educational standards in support of our training program for the legal metrology and laboratory metrology community. By
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