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You searched on: Author: stefan leigh

Displaying records 11 to 20 of 91 records.
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11. 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 ...

Published: 4/24/2013
Authors: Michele Miller Schantz, Katherine E Sharpless, Stephen Albert Wise, Rebecca Heltsley, Jennifer Keller, John Kucklick, Stacy VanderPol, Stefan D Leigh, Donald G. Patterson, Jr., Andreas Sjodon, Wayman E. Turner
Abstract: Four new Standard Reference Materials (SRMs) have been developed to assist in the quality assurance required for human biomonitoring studies. These materials are SRM 1953 Organic Contaminants in Non-Fortified Human Milk, SRM 1954 Organic Contamiants ...

13. 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 ( ...

14. 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 ...

15. Certification of NIST SRM 2569 Lead Paint Films for Children's Products
Published: 10/15/2012
Authors: John L Molloy, John R Sieber, Karen E Murphy, Stephen E Long, Stefan D Leigh
Abstract: SRM 2569 Lead Paint Films for Children‰s Products is a new Standard Reference Material (SRM) developed for use primarily with XRF instrumentation. It consists of three paint coatings, with nominally 0 mg/kg, 90 mg/kg, and 300 mg/kg of Pb added, on p ...

16. 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 ...

17. 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 ...

18. On the Relationship Between Deformation-Induced Surface Roughness and Plastic Strain in AA5052, Is it Really Linear?
Published: 8/1/2011
Authors: Mark R Stoudt, Joseph Bunton Hubbard, Stefan D Leigh
Abstract: Three different heat treatments of aluminum alloy AA5052 were subjected to various levels of uniaxial plastic strain. The resulting surface topographies were then evaluated using scanning laser confocal microscopy (SLCM) and stylus profilometry. St ...

19. SRM 1450d, Fibrous-Glass Board, for Thermal Conductivity from 280 K to 340 K
Series: Special Publication (NIST SP)
Report Number: 260-173
Published: 8/1/2011
Authors: Robert R Zarr, Amanda C. Harris, John F Roller, Stefan D Leigh
Abstract: Thermal conductivity measurements at and near room temperature are presented as the basis for certified values of thermal conductivity for SRM 1450d, Fibrous Glass Board. The measurements have been conducted in accordance with a randomized full fact ...

20. 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 ...

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  • SP 250-XX: Calibration Services
  • SP 260-XX: Standard Reference Materials
  • SP 300-XX: Precision Measurement and Calibration
  • SP 400-XX: Semiconductor Measurement Technology
  • SP 480-XX: Law Enforcement Technology
  • SP 500-XX: Computer Systems Technology
  • SP 700-XX: Industrial Measurement Series
  • SP 800-XX: Computer Security Series
  • SP 823-XX: Integrated Services Digital Network Series