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Author: nathanael heckert
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1. Analyzing a Co-Polymer Aramid Fiber for Use in Soft Body Armor
Walter G McDonough, Jae Hyun Kim, Nathanael A Heckert, Amanda Lattam Forster, Scott A Wight, Joy P Dunkers, Gale Antrus Holmes
Since the well-publicized failure of body armor used by a police officer, it has become imperative that the long-term properties and performance of new fibers being considered for use be understood. The range of interest is from the molecular proper ...
2. Statistical Analysis of Single PPTA Fibers
Nathanael A Heckert, Jae Hyun Kim, Kirk D Rice, Gale Antrus Holmes
Discuss statistical methods used for analysis of single fiber tensile strength tests. Kernel density plots and quantile-quantile plots were used to graphically analyze the data. Fiber strength was modeled using 2-parameter Weibull, 3-parameter Weib ...
3. An Interlaboratory Investigation of the Effect of Material Granularity and Sample Processing on
Measurement Variability: Nutritional Elements in Cereals
NIST Interagency/Internal Report (NISTIR)
Katrice A Lippa, Laura J Wood, Stefan D Leigh, Nathanael A Heckert
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 ...
4. Effects of fiber gripping methods on the single fiber tensile test:
I. Non parametric statistical analysis
Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
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 ( ...
5. Breakfast Cereal Sampling Study for Nutritional Elements
Laura J Wood, Katrice A Lippa, Melissa Meaney Phillips, Catherine A Rimmer, Nathanael A Heckert, Stefan D Leigh, Amanda J Moors, Rebecca S Pugh
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 ...
6. A Bayesian Quantitative Nondestructive Evaluation (QNDE) Approach to Estimating Remaining Life of
Aging Pressure Vessels and Piping
Jeffrey T Fong, William F Guthrie, James J Filliben, Nathanael A Heckert
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 ...
7. Statistical analysis of fiber gripping effects on Kolsky bar test
Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Richard L. Rhorer, Kirk D Rice, Gale Antrus Holmes
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 ...
8. Statistical analysis of fiber gripping effects on single fiber tensile test
Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Walter G McDonough, Haruki Kobayashi, Kirk D Rice, Gale Antrus Holmes
9. A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications
Special Publication (NIST SP)
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
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 ...
10. A Risk-Uncertainty Formula Accounting for Uncertainties of Failure Probability and Consequence in a Nuclear Powerplant
Jeffrey T Fong, Stephen R Gosselin, Pedro Vincente 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-authore ...