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Topic Area: Materials Science

Displaying records 311 to 320 of 526 records.
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311. 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

312. 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

313. 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

314. 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

315. 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

316. 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

317. 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

318. 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

319. 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

320. Diffusion Under Temperature Gradient: A Phase-field Model Study
Topic: Materials Science
Published: 8/11/2009
Authors: Rashmi R. Mohanty, Jonathan E Guyer, Yong Ho Sohn
Abstract: A diffuse interface model was devised and employed to investigate the effect of thermotransport (a.k.a., thermomigration) process in single-phase and multi-phase alloys of a binary system. Simulation results show that an applied temperature gradien ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902396



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