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Topic Area: Materials Science

Displaying records 311 to 320 of 527 records.
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311. A Coherent Approach for Interrogating Polybenzoxazole Fibers for Residual Phosphoric Acid
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7573
Topic: Materials Science
Published: 9/17/2009
Authors: Gale Antrus Holmes, Eun S. Park, Charles Martin Guttman, Kathleen M. Flynn, John R Sieber, Stephanie S Watson, Kirk D Rice
Abstract: Because of the premature failure of soft-body armor that contains the active fiber poly [(benzo-[1,2-d:5,4-d‰]-benzoxazole-2,6-diyl)-1,4-phenylene] (PBO), the Office of Law Enforcement Standards (OLES) at the National Institute of Standards and Techn ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902057

312. MORPHOLOGY AND FRACTURE OF ENAMEL
Topic: Materials Science
Published: 9/16/2009
Authors: Sang-Won Myoung, James J. Lee, Paul Constantino, Peter Lucas, Brian Ronald Lawn
Abstract: Teeth are remarkable biological structures, brittle but resilient. Here we examine the inter-relation between enamel morphology and crack resistance by sectioning human molar teeth after loading to fracture. The sections reveal that many cracks s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901535

313. An electrical pulse-heated Kosky bar technique for high strain rate flow stress measurements of rapidly heated metals
Topic: Materials Science
Published: 9/13/2009
Authors: Steven P Mates, Stephen W Banovic, Richard L. Rhorer, Timothy J Burns, Eric Paul Whitenton, D Basak
Abstract: We have developed a unique electrical pulse-heated Kolsky Bar technique for measuring the flow stress of metals at heating rates of up to 6000 °C per second and strain rates up to 10^4 per second. Under these conditions, which are approaching those f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901787

314. A Practical and Systematic Review of Weibull Statistics for Reporting Strengths of Dental Materials
Topic: Materials Science
Published: 9/11/2009
Authors: Janet Quinn, George David Quinn
Abstract: Objective: To review the history, theory and current applications of Weibull analysis sufficient to make informed decisions regarding practical use of the analysis in dental material strength testing. Data: References are made to examples in the eng ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901550

315. Condensed Matter Astrophysics A Prescription for Determining the Species-Specific Composition and Quantity of Interstellar Dust using X-rays
Topic: Materials Science
Published: 9/10/2009
Authors: Bruce D Ravel, Julia C. Lee, Jingen Xiang, Jeffrey Kortright, Kathryn Flanagan
Abstract: We present a new technique for determining the quantity and composition of dust in astrophysical environments using < 6 keV X-rays. We argue that high resolution X-ray spectra as enabled by the Chandra and XMM-Newton gratings should be considered ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903572

316. Studying Long-term Performance of a Nano-ZnO filled Waterborne Polyurethane Coating using Spectroscopies and Microscopies
Topic: Materials Science
Published: 9/9/2009
Authors: Xiaohong Gu, Dongmei Zhe, Stephanie S Watson, Guodong Chen, Minhua Zhao, Paul E Stutzman, Deborah L Stanley, Tinh Nguyen, Joannie W Chin, Jonathan W. Martin
Abstract: Although inorganic UV absorbers such as zinc oxide (ZnO) and cerium oxide (CeO2) exhibit numerous advantages compared to organic UV absorbers, the mechanisms of how these nanoparticles affect the long-term performance of polymeric coatings are less t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903215

317. Elastic Modulus of Amorphous Polymer Thin Films: Relationship to the Glass Transition Temperature
Topic: Materials Science
Published: 8/24/2009
Authors: Jessica M. Torres, Christopher M Stafford, Bryan D. Vogt
Abstract: Understanding the mechanical properties of polymers at the nanoscale is critical in numerous emerging applications. While it has been widely shown that the Tg in thin polymer films decreases due to confinement effects, there is little known about th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902430

318. Methods for TEM analysis of NIST s single-walled carbon nanotube Standard Reference Material
Topic: Materials Science
Published: 8/20/2009
Authors: Elisabeth Mansfield, Roy Howard Geiss, Jeffrey A Fagan
Abstract: The National Institute of Standards and Technology (NIST) is releasing a series of single-walled carbon nanotube Standard Reference Materials (SRMs) to provide consumers with a well-characterized material for their applications. The SWCNT Reference ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903069

319. Glassy Carbon as an Absolute Intensity Calibration Standard for Small Angle Scattering
Topic: Materials Science
Published: 8/19/2009
Authors: Andrew John Allen, Jan Ilavsky, Fan Zhang, Gabrielle G Long, Pete R. Jemian
Abstract: Absolute calibration of small-angle scattering (SAS) intensity data (in units of differential cross-section per unit sample volume per unit solid angle) is essential for many important aspects of quantitative SAS analysis, such as obtaining the numbe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901709

320. Synthesis, characterization and evaluation of novel, anti-bacterial monomers for dental and biomedical applications
Topic: Materials Science
Published: 8/16/2009
Authors: Joseph M Antonucci, Bruce Owen Fowler, Diana N. Zeiger, Nancy J Lin, Sheng Lin-Gibson
Abstract: Although progress has been made in reducing polymerization shrinkage through resin and filler phase modifications, and in designing improved dental adhesion systems, composite fillings still fail clinically because of bacterial infiltration and secon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901947



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