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Infrastructure

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Displaying 151 - 175 of 177

Building Open Access to Research (OAR) data infrastructure at NIST

July 8, 2019
Author(s)
Gretchen R. Greene
As a National Metrology Institute (NMI), the National Institute of Science and Technology (NIST) scientists, engineers and technology experts conduct research across a full spectrum of physical science domains. This is performed as a public service within

Uncertainty Quantification of Failure Probability and a Dynamic Risk Analysis of Decision Making for Maintenance of Ageing Infrastructure

January 2, 2019
Author(s)
Jeffrey T. Fong, James J. Filliben, Nathanael A. Heckert, Dennis D. Leber, Paul A. Berkman, Robert E. Chapman
Risk, as the product of failure probability and failure consequence, has been estimated and applied by engineers and managers to help make critical decisions on (a) maintenance of ageing plants, and (b) planning of new infrastructure. For ageing plants

THREE APPROACHES TO QUANTIFICATION OF NDE UNCERTAINTY AND A DETAILED EXPOSITION OF THE EXPERT PANEL APPROACH USING THE SHEFFIELD ELICITATION FRAMEWORK

July 15, 2018
Author(s)
Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben, Steven R. Doctor
The ASME Boiler & Pressure Vessel Code Section XI Committee is currently developing a new Division 2 nuclear code entitled the "Reliability and Integrity Management (RIM) program," with which one is able to arrive at a risk-informed, NDE-based engineering

UNCERTAINTY IN MULTI-SCALE CREEP RUPTURE LIFE MODELING AND A NEW APPROACH TO ESTIMATING FREQUENCY OF IN-SERVICE INSPECTION OF COMPONENTS AT ELEVATED TEMPERATURES (*)

April 3, 2018
Author(s)
Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben, Marvin J. Cohn
Uncertainty in modeling the creep rupture life of a full-scale component using experimental data at microscopic (Level 1), specimen (Level 2), and full-size (Level 3) scales, is addressed by applying statistical theory of prediction intervals, and that of

Road Mapping Workshop Report on Overcoming Barriers to Adoption of Composites in Sustainable Infrastructure

December 20, 2017
Author(s)
Richard J. Sheridan, Jeffrey W. Gilman, John Busel, David Hartman, Gale A. Holmes, Daniel Coughlin, Paul Kelley, Dustin Troutman, Jim Gutierrez, Charles Bakis, Robert Moser, Ellen Lackey, James R. Fekete, Stephanie S. Watson, Jae Hyun Kim, Aaron M. Forster, Ajay Krishnamurthy, Bharath NMN Natarajan, William O'Donnell
The February 2017 “Road Mapping Workshop on Overcoming Barriers to Adoption of Composites in Infrastructure” brought together designers, manufacturers, researchers, and end-users to identify barriers and potential solutions. Composite products produced in

NSRL Kaspersky dataset documentation

October 23, 2017
Author(s)
Alexander J. Nelson
The National Institute of Standards and Technology (NIST) National Software Reference Library (NSRL) has created curated releases of the Reference Data Set (RDS) consisting of hashes of Kaspersky products. This is in response to the DHS directive on

A STATISTICAL APPROACH TO ESTIMATING A 95 % CONFIDENCE LOWER LIMIT FOR THE DESIGN CREEP RUPTURE TIME VS. STRESS CURVE WHEN THE STRESS ESTIMATE HAS AN ERROR UP TO 2 % (*)

July 17, 2016
Author(s)
Jeffrey T. Fong, James J. Filliben, Nathanael A. Heckert, Pedro V. Marcal, Marvin J. Cohn
Recent experimental results on creep-fracture damage with minimum time to failure (minTTF) varying as the 9th power of stress, and a theoretical consequence that the coefficient of variation (CV) of minTTF is necessarily 9 times that of the CV of the

Uncertainty Quantification of Stresses in a Cracked Pipe Elbow Weldment Using a Logistic Function Fit, a Nonlinear Least Squares Algorithm, and a Super-Parametric Method

December 30, 2015
Author(s)
Jeffrey T. Fong, James J. Filliben, Nathanael A. Heckert, Pedro V. Marcal, Robert Rainsberger, Li Ma
In a 3-part series of papers, of which this paper is Part II, we investigate the applicability of the fully quadratic hexa-27 element (see Part I) to four problems of interest to the pressure vessels and piping community: (1) The solid-element-based
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