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Displaying 26 - 50 of 98

SRM 1450d, Fibrous-Glass Board, for Thermal Conductivity from 280 K to 340 K

August 1, 2011
Author(s)
Robert R. Zarr, Amanda C. Harris, John F. Roller, Stefan D. Leigh
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 factorial

Statistical analysis of fiber gripping effects on Kolsky bar test

June 14, 2011
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Richard L. Rhorer, Kirk D. Rice, Gale A. 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 different

Elemental Analysis of a Single-Walled Carbon Nanotube Candidate Reference Material

October 15, 2010
Author(s)
Rolf L. Zeisler, Rick L. Paul, Rabia Oflaz, Lee L. Yu, Jacqueline L. Mann, William R. Kelly, Brian E. Lang, Stefan D. Leigh, Jeffrey A. Fagan
A material containing single-walled carbon nanotubes (SWCNTs) together with other carbon species, cata-lyst residues, and trace element contaminants has been prepared by the National Institute of Standards and Technology for characterization and

A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications

September 16, 2010
Author(s)
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 in

Polycyclic Aromatic Hydrocarbons (PAHs) in a Coal Tar Standard Reference Material - SRM 1597a Updated

July 20, 2010
Author(s)
Stephen A. Wise, Dianne L. Poster, Stefan D. Leigh, Catherine A. Rimmer, Stephanie Mossner, Patricia Schubert, Lane C. Sander, Michele M. Schantz
SRM 1597 Complex Mixture of Polycyclic Aromatic Hydrocarbons from Coal Tar, originally issued in 1987, was recently reanalyzed and reissued as SRM 1597a with 34 certified and 46 reference concentrations for polycyclic aromatic hydrocarbons (PAHs) and

Polycyclic Aromatic Hydrocarbons (PAHs) in a Coal Tar Standard Reference Material - SRM 1597a Updated

July 20, 2010
Author(s)
Stephen A. Wise, Dianne L. Poster, Stefan D. Leigh, Catherine A. Rimmer, Stephanie Mossner, Patricia Schubert, Lane C. Sander, Michele M. Schantz
SRM 1597 Complex Mixture of Polycyclic Aromatic Hydrocarbons from Coal Tar, originally issued in 1987, was recently reanalyzed and reissued as SRM 1597a with 34 certified, 46 reference, and 12 information concentrations for polycyclic aromatic hydrocarbons

High Speed Fiber Testing: The Single Fold Test

May 20, 2010
Author(s)
Haruki Kobayashi, Walter G. McDonough, Alexander J. Shapiro, Jae H. Kim, Stefan D. Leigh, Amanda L. Forster, Kirk D. Rice, Gale A. Holmes
The failure of a first responder s body armor has prompted research to assess the long-term durability and effectiveness of current and future soft body armor products. Prior work in this laboratory described a 10 % drop in tensile strength and 15 % drop

Marine Mammal Blubber Reference and Control Materials for Use in the Determination of Halogenated Organic Compounds and Fatty Acids

March 19, 2010
Author(s)
John R. Kucklick, Michele M. Schantz, Rebecca S. Pugh, Barbara J. Porter, Dianne L. Poster, Paul R. Becker, Teresa Rowles, Stefan D. Leigh, Stephen A. Wise
The National Institute of Standards and Technology (NIST) has a diverse collection of control materials derived from marine mammal blubber, fat, and serum. Standard Reference Material (SRM) 1945 Organics in Whale Blubber was recertified for polychlorinated

Uncertainties in Electron Probe Microanalysis

March 12, 2010
Author(s)
Ryna B. Marinenko, Stefan D. Leigh
This tutorial discusses the importance of citing valid uncertainties when reporting analytical results and the need for a universally accepted approach for evaluating uncertainties. Today, the CIPM procedure has been accepted by numerous international

Characterization of SiGe Films for use as a National Institute of Standards and Technology (NIST) Microanalysis Reference material (RM 8905)

February 1, 2010
Author(s)
Ryna B. Marinenko, Shirley Turner, David S. Simons, Savelas A. Rabb, Rolf L. Zeisler, Lee L. Yu, Dale E. Newbury, Rick L. Paul, Nicholas W. Ritchie, Stefan D. Leigh, Michael R. Winchester, Lee J. Richter, Douglas C. Meier, Keana C. Scott, D Klinedinst, John A. Small
Bulk SiGe wafers cut from single-crystal boules and two SiGe thick films (4 m and 5 m thick) on Si wafers were evaluated with the electron probe microanalyzer for the extent of heterogeneity and composition for use as reference materials needed by the

A Statistic That Identifies Errant Standard Preparation and Instrument Non-linearity Demonstrated With Mercury Standards Prepared by Blending NIST Fossil Fuel CRMs of Similar Matrices

November 16, 2009
Author(s)
Bruce S. MacDonald, John L. Molloy, Stefan D. Leigh, William R. Kelly, Andrew L. Rukhin
Interval-repeatability (Ir) is a statistic that users of certified reference materials (CRMs) may employ as a quality control check to identify incorrectly prepared working standards or nonlinear instrument response over a targeted concentration interval

Determination of Perfluorinated Alkyl Acid concentrations in Human Serum and Milk Standard Reference Materials

October 28, 2009
Author(s)
Jennifer M. Lynch, Antonia M. Calafat, Kayoko Kato, Mark E. Ellefson, William K. Reagen, Mark Strynar, Steven G. O'Connell, Craig M. Butt, Scott Mabury, Jeff Small, D.C.G. Muir, Stefan D. Leigh, Michele M. Schantz
Standard Reference Materials (SRMs) are homogeneous, well-characterized materials that are used to validate measurement methods and are critical in improving data quality. Disagreements in perfluorinated alkyl acid (PFAA) concentrations measured in

Effects of sample preparation on bacterial colonization of polymers

October 19, 2009
Author(s)
Diana N. Zeiger, Christopher Stafford, Yajun Cheng, Stefan D. Leigh, Sheng Lin-Gibson, Nancy Lin
Characterization of materials developed for medical usage frequently includes studies in which the materials are inoculated with bacteria in order to assess biofilm formation. Differences in the bacteria are considered to be due to the material alone; the

Report on Acceleration Comparison SIM.AUV.V-K1 - Draft B

March 20, 2009
Author(s)
David J. Evans, Adriana Hornikova, Stefan D. Leigh, Andrew L. Rukhin, William E. Strawderman
The first regional key comparison in vibration conducted under the auspices of the Inter-American System of Metrology (SIM) was begun in 1996. The comparison was registered with the International Bureau of Weights and Measures (BIPM) through the

Methodology for Evaluating Candidate Geometric Reference Scaffolds

November 1, 2007
Author(s)
Joy P. Dunkers, Stefan D. Leigh, David Dean, M Cooke, Richard Ketcham, Marcus T. Cicerone
The motivation for the work is to rank candidate reference scaffolds by quality metrics in a systematic and quantitative manner by screening several microstructural descriptors of importance. We chose total pore volume, pore volume distribution, and pore