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You searched on: Author: nathanael heckert

Displaying records 21 to 30 of 48 records.
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21. An Interlaboratory Investigation of the Effect of Material Granularity and Sample Processing on Measurement Variability: Nutritional Elements in Cereals
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7927
Published: 5/9/2013
Authors: Katrice A Lippa, Laura J Wood, Stefan D Leigh, Nathanael A Heckert
Abstract: This interlaboratory study was uniquely designed to determine the effects of material granularity and sample processing techniques on the measurement variability (i.e. precision) of nutritional elements in various cereal materials. Participants w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911835

22. Effects of fiber gripping methods on single fiber tensile tests: Parametric statistical analyses of tensile strengths and failure strains
Published: 5/9/2013
Authors: Jae Hyun Kim, Nathanael A Heckert, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
Abstract: The Kolsky bar test has been widely used in measuring material response under high strain rate conditions. Initial experiments in the literature applying this test to measure single fiber properties for fibers used in soft body armor with the Kolsky ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913211

23. Effects of fiber gripping methods on the single fiber tensile test: I. Non parametric statistical analysis
Published: 2/15/2013
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
Abstract: Single fiber tensile tests using two different gripping methods were carried out on various fiber lengths. One method (the glue-tab grip) consists of mounting a fiber onto a rigid tab as specified in ASTM C1557-03 using an adhesive, while the other ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910750

24. Breakfast Cereal Sampling Study for Nutritional Elements
Published: 2/5/2013
Authors: Laura J Wood, Katrice A Lippa, Melissa Meaney Phillips, Catherine A Rimmer, Nathanael A Heckert, Stefan D Leigh, Amanda J Moors, Rebecca S Pugh
Abstract: The National Institute of Standards and Technology (NIST) has established a Dietary Supplement Laboratory Quality Assurance Program (DSQAP) in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS). The DSQAP de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912364

25. 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

26. 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

27. Tensile behavior of single PPTA fibers measured by the Kolsky bar using the direct fiber clamping method
Published: 6/11/2012
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Richard L. Rhorer, Kirk D Rice, Gale Antrus Holmes
Abstract: The Kolsky bar test has been widely used in measuring material behavior under high strain rate conditions. In particular, this methodology has been used to characterize the high strain rate behavior of polymer and polymer composites during ballistic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910973

28. Statistical comparisons of single PPTA fiber tensile behaviors measured by different gripping methods
Published: 5/24/2012
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
Abstract: A new single fiber tensile test method using the Kolsky bar is being utilized to investigate fiber properties under high strain rate conditions. Since fiber tensile properties exhibit broad, dispersed distributions, a large number of test specimens a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910422

29. Statistical analysis of fiber gripping effects on Kolsky bar test
Published: 6/14/2011
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Richard L. Rhorer, Kirk D Rice, Gale Antrus Holmes
Abstract: Preliminary data for testing fibers at high strain rates using the Kolsky bar test by Ming Cheng et al. 1 indicated minimal effect of strain rate on the tensile stress-strain behavior of PPTA, poly (p-phenylene terephathalamide) fibers. In a differen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908102

30. Statistical analysis of fiber gripping effects on single fiber tensile test
Published: 5/26/2011
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Walter G McDonough, Haruki Kobayashi, Kirk D Rice, Gale Antrus Holmes
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907786



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