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Metrology

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Displaying 1501 - 1525 of 2718

Properties for Accurate Gas Flow Measurements

October 15, 2010
Author(s)
John D. Wright
Accurate gas properties are needed to take full advantage of the low uncertainties provided by NIST’s Gas Flow Calibration Services. If a flowmeter user and NIST use different values for these properties (molecular mass, compressibility, density, viscosity

Reliability of Embedded and Cyber-Physical Systems

October 14, 2010
Author(s)
Ram Chillarege, Jeff Voas
Cyber-physical systems feature a tight combination of a system's computational and physical elements. Understanding how to assess and design trustworthiness into these complex systems of systems remains an unsolved problem. This issue offers insights into

NIST WMD update presentation for NISA October, 2010

October 4, 2010
Author(s)
John W. Barton
The presentation will cover recent and upcoming events, changes, and the focus for the NIST Weights and Measures Division (WMD). Topics will include the agency-wide restructuring of NIST, current projects underway at WMD, NIST Handbook 44 changes for 2011

On Multiple-Method Studies

October 4, 2010
Author(s)
Chih-Ming Wang, Hariharan K. Iyer
In this paper we review statistical models that describe measurements from a multiple-method study such as in the development of a reference material. We also review requirements for the so-called GUM compliance as this appears to be an important criterion

Multi-Frequency Approach to Vector-Network-Analyzer Scattering-Parameter Measurements

September 28, 2010
Author(s)
Arkadiusz C. Lewandowski, Dylan F. Williams, Wojciech Wiatr
We present a multi-frequency approach to vector-network-analyzer scattering-parameter measurements. This novel approach accounts for the relationships between the measurements at different frequencies, and thus breaks with the traditional paradigm to

Fatigue Pre-Cracking Curved Wide Plates in Bending

September 27, 2010
Author(s)
Mark D. Richards, Timothy S. Weeks, Joseph D. McColskey, Bo Wang, Yong-Yi Wang
In support of using high strength steels for strain-based design of pipeline, curved wide plate (CWP) tests in tension are being performed on API 5L X100 pipes of 36-inch (916-mm) diameter and 0.75-inch (19-mm) wall thickness. The CWP tests are being used

Energy Absorption Measurements to Standardize Foam in Stab Testing

September 13, 2010
Author(s)
Aaron M. Forster, Diane Mauchant, Elizabeth Wailes, Amanda L. Forster, Michael A. Riley, Kirk D. Rice
Polymer foams serve an important role in the assessment and certification of stab resistant body armor for both US and UK standards. A composite of neoprene and polyethylene foam is used behind the armor during testing. The foam mimics stab dynamics by

A More General Type A Evaluation

September 9, 2010
Author(s)
Ruediger Kessel, Raghu N. Kacker, Klaus-Dieter Sommer
The evaluation of uncertainty according to the Guide to the Expression of Uncertainty in measurement is the internationally agreed procedure to evaluate the complete result statement in measurement including measurement uncertainty. It distinguishes two

Measuring Up to Sustainable Water: Report from the 2010 NIST/Virginia Tech. Water Workshop

September 9, 2010
Author(s)
Lauren F. Greenlee, Jessica D. Torrey, Stephanie A. Hooker, Michael J. Fasolka, Sunil K. Sinha, Marc A. Edwards
Securing water sources of sufficient quality and quantity poses a major barrier to growing communities. Major investments in capitol and materials are planned in water treatment and distribution system infrastructure over the next several decades, but

Improving the NIST High-Performance ICP-OES Methodology through Exact Matching

August 26, 2010
Author(s)
Michael R. Winchester, Therese A. Butler, Gregory C. Turk
High-Performance” (HP-)ICP-OES was developed at the National Institute of Standards and Technology (NIST) approximately a decade ago as a means of performing ICP OES analyses with relative expanded uncertainty on the order of 0.2 %, expressed at a level of

Embedded Capacitive Displacement Sensor for Nanopositioning Applications

August 17, 2010
Author(s)
Svetlana Avramov-Zamurovic1, Nicholas Dagalakis, Rae Duk Lee, Yong Sik Kim, Jae M. Yoo, Seung H. Yang
The scale of nano objects requires very precise position determination. The state-of-the-art manipulators involve accurate nanometer positioning. This paper presents the design of a capacitive displacement sensor for a nanopositioning application. The

Lights, Camera, Metrology: Introducing the Metrology Careers Outreach DVD

July 25, 2010
Author(s)
Elizabeth J. Benham
The National Conference of Standards Laboratories International (NCSLI) 164 Education Liaison and Outreach Committee has coordinated the development of a Metrology Career Multimedia DVD, titled "Find a Cool Career in Metrology." The DVD is designed for use

Temperature stabilization system with millikelvin gradients for refractometry

July 25, 2010
Author(s)
Patrick F. Egan, Jack A. Stone Jr.
Refractometry of air is a central problem for interferometer-based dimensional measurements. Refractometry at the 10^{-9} level is only valid if air temperature gradients are controlled at the millikelvin level. Very precise tests of second-generation NIST

A Risk-Uncertainty Formula Accounting for Uncertainties of Failure Probability and Consequence in a Nuclear Powerplant

July 20, 2010
Author(s)
Jeffrey T. Fong, Stephen R. Gosselin, Pedro V. Marcal, James J. Filliben, Nathanael A. Heckert, Robert E. Chapman
This paper is a continuation of a recent ASME Conference paper entitled "Design of a Python-Based Plug-in for Bench-marking Probabilistic Fracture Mechanics Computer Codes with Failure Event Data" (PVP2009-77974). In that paper, which was co-authored by

Polycyclic Aromatic Hydrocarbons (PAHs) in a Coal Tar Standard Reference Material - SRM 1597a Updated

July 20, 2010
Author(s)
Stephen A. Wise, Dianne L. Poster, Stefan D. Leigh, Catherine A. Rimmer, Stephanie Mossner, Patricia Schubert, Lane C. Sander, Michele M. Schantz
SRM 1597 Complex Mixture of Polycyclic Aromatic Hydrocarbons from Coal Tar, originally issued in 1987, was recently reanalyzed and reissued as SRM 1597a with 34 certified and 46 reference concentrations for polycyclic aromatic hydrocarbons (PAHs) and
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