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Author: nathanael heckert
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Displaying records 1 to 10 of 37 records.
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1. A Bayesian Quantitative Nondestructive Evaluation (QNDE) Approach to Estimating Remaining Life of Aging Pressure Vessels and Piping
Published: 1/1/2013
Authors: Jeffrey T Fong, William F Guthrie, James J Filliben, Nathanael A Heckert
Abstract: In this paper, we use a Bayesian quantitative nondestructive evaluation (QNDE) approach to estimating the remaining life of aging structures and components. Our approach depends on in-situ NDE measurements of detectable crack lengths and crack g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913221

2. A Design-of-Experiments Approach to FEM Uncertainty Analysis for Optimizing Magnetic Resonance Imaging RF Coil Design
Published: 10/10/2014
Authors: Jeffrey T Fong, Nathanael A Heckert, James J Filliben, Li Ma, Karl F Stupic, Kathryn E Keenan, Stephen E Russek
Abstract: Using the RF module of COMSOL, we compute the magnetic flux density norm (BN) profiles for frequencies in the 76 to 100 MHz range, inside of a prototype birdcage coil, courtesy of Japan's National Institute of Radiological Sciences (NIRS), loaded wit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917201

3. A Design-of-Experiments Plug-In for Estimating Uncertainties in Finite Element Simulations
Published: 5/18/2009
Authors: Jeffrey T Fong, Roland deWit, Pedro Vincente Marcal, James J Filliben, Nathanael A Heckert
Abstract: The objective of this paper is to introduce an economical and user-friendly technique for estimating a specific type of finite element simulation uncertainties, or, "error bars," for a class of mathematical models, of which no closed-form o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902335

4. A New Approach to Finding a Risk-Informed Safety Factor for ,Fail-SafeŠ Pressure Vessel and Piping Design
Published: 8/24/2014
Authors: Jeffrey T Fong, Nathanael A Heckert, James J Filliben, Pedro Vincente Marcal, Stephen W. Freiman
Abstract: The purpose of this paper is to present a new approach to finding a risk-informed safety factor for the "fail-safe" design of a high-consequence engineering system. The new approach is based on the assumption of a 99.99 % confidence level and a 99.9 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916388

5. A Risk-Uncertainty Formula Accounting for Uncertainties of Failure Probability and Consequence in a Nuclear Powerplant
Published: 7/20/2010
Authors: Jeffrey T Fong, Stephen R Gosselin, Pedro Vincente Marcal, James J Filliben, Nathanael A Heckert, Robert E Chapman
Abstract: 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-authore ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905670

6. A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications
Series: Special Publication (NIST SP)
Report Number: 800-22
Published: 5/15/2001
Authors: Andrew L Rukhin, Juan Soto, James R Nechvatal, Miles E. Smid, Elaine B Barker, Stefan D Leigh, M Levenson, M Vangel, D L. Banks, Nathanael A Heckert, James F Dray Jr, S C. Vo
Abstract: [Superseded by SP 800-22 Revision 1a (April 2010): http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906762] This paper discusses some aspects of selecting and testing random and pseudorandom number generators. The outputs of such generat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151222

7. A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications
Series: Special Publication (NIST SP)
Report Number: 800-22 Rev 1a
Published: 9/16/2010
Authors: Lawrence E Bassham, Andrew L Rukhin, Juan Soto, James R Nechvatal, Miles E. Smid, Stefan D Leigh, M Levenson, M Vangel, Nathanael A Heckert, D L. Banks
Abstract: This paper discusses some aspects of selecting and testing random and pseudorandom number generators. The outputs of such generators may be used in many cryptographic applications, such as the generation of key material. Generators suitable for use i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906762

8. A Stochastic and Local Theory of Fatigue for Aging Pressure Vessels and Piping
Published: 11/4/2012
Authors: Jeffrey T Fong, Nathanael A Heckert, James J Filliben
Abstract: We begin with a review of the fatigue design methodology for new pressure vessels and piping, based on both deterministic and stochastic approaches. We will then prove that the same methodology for estimating the remaining life of aging pressure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912440

9. A Web-Based Data Analysis Methodology for Estimating Reliability of Weld Flaw Detection, Location, and Sizing
Published: 7/27/2008
Authors: Jeffrey T Fong, Owen F Hedden, James J Filliben, Nathanael A Heckert
Abstract: Recent advances in computer technology, intemet communication networks, and fmite element modeling and analysis capability have made it feasible for engineers to accelerate the feedback loop between the field inspectors of a structure or component fo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=152099

10. AN ECONOMICS-BASED INTELLIGENCE (EI) TOOL FOR PRESSURE VESSEL & PIPING (PVP) FAILURE CONSEQUENCE ESTIMATION
Published: 7/20/2010
Authors: Robert E Chapman, Jeffrey T Fong, David T Butry, Douglas S Thomas, James J Filliben, Nathanael A Heckert
Abstract: This paper is built around ASTM E 2506, Standard Guide for Developing a Cost-Effective Risk Mitigation Plan for New and Existing Constructed Facilities. E 2506 establishes a three-step protocol--perform risk assessment, specify combinations of risk ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905671



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