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Topic Area: Materials Science

Displaying records 391 to 400 of 514 records.
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391. Fracture Toughness through a Welded Pipeline Section - Crack Tip Opening Angle Criterion
Topic: Materials Science
Published: 4/23/2007
Authors: Philippe P. Darcis, Christopher N McCowan, Elizabeth S Drexler, Joseph David McColskey, Avigdor Shtechman, Thomas Allen Siewert
Abstract: The increasing demand for natural gas as an alternative energy source implies continued growth of gas pipeline installations. This trend compels the natural gas transmission industry to consider the construction of larger-diameter, higher-pressure pi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50531

392. Depletion of grain-boundary phase and elastic creep deformation upon ultra-long flexural stress rupture experiments of NC-132 silicon nitride
Topic: Materials Science
Published: 4/18/2007
Authors: H J Kleebe, W Braue, George David Quinn
Abstract: Two MgO-doped Si3N4 specimens (Norton, NC-132) were tested in ultra-long flexure stress rupture experiments with an external load of 266 MPa, i.e., 14.941 and 17.376 hours. Following mechanical testing, the materials were characterized by transmissi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850955

393. Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and {alpha}-iron
Topic: Materials Science
Published: 4/15/2007
Authors: Sudook A Kim, Ward L Johnson
Abstract: The elastic constants and internal friction of induction hardened and unhardened SAE 1050 plain-carbon steel were determined by acoustic resonance spectroscopy. The hardened specimen contained only martensite and the unhardened specimen was ferrite-p ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50255

394. X-Ray Standing Wave Analysis of Overlayer Induced Substrate Relaxation: The Clean and Bi-covered (110) GaP Surface
Topic: Materials Science
Published: 4/1/2007
Authors: A Herrera-Gomez, Joseph C Woicik, T Kendelewicz, K E Miyano, W E Spicer
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854331

395. Phase Equilibria of BaO-R^d2^O^d3^-CuO^dz^ Systems (R=Y and Lanthanides) Under CO^d2^-Free Conditions
Topic: Materials Science
Published: 3/13/2007
Authors: Winnie K Wong-Ng, Z Yang, Lawrence P. Cook, Julia Frank, Mario Loung, Qingzhen Huang
Abstract: For applications of phase equilibria to the processing of second-generation high Tc superconductor-coated-conductors, phase diagrams constructed under carbonate-free conditions are needed. Subsolidus phase equilibria of BaO-R2O3-CuOz (R=Ho) have bee ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851014

396. Influence of Oxygen Vacancies on the Dielectric Properties of Hafnia
Topic: Materials Science
Published: 3/1/2007
Author: Eric J Cockayne
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854316

397. Pyrochlore Formation, Phase Relations, and Properties in the CaO-TiO2-(Nb,Ta)2O5 Systems
Topic: Materials Science
Published: 3/1/2007
Authors: Terrell A Vanderah, Robert S. Roth, Ian E. Grey, W G Mumme, P Bordet, J C Ninod
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854394

398. Interrogation of 'Surface', 'Skin' and 'Core' Orientation in Thermotropic Liquid-Crystalline Copolyester Moldings by Near-Edge X-Ray Absorption Fine Structure and Wide-Angle X-Ray Scattering
Topic: Materials Science
Published: 2/26/2007
Authors: S Rendon, Robert A Bubeck, L S Thomas, W R Burghardt, A Hexemer, Daniel A Fischer
Abstract: Injection molding of thermotropic liquid-crystalline polymers (TLCPs) can result in molded articles the exhibit complex orientation states that vary considerably as a function of depth in the part. Skin-core morphologies are often observed in TLCP ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851047

399. Local Structure of Displacively-Disordered Pyrochlore Dielectrics
Topic: Materials Science
Published: 2/20/2007
Authors: Victor Lvovich Krayzman, Joseph C Woicik
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854320

400. Effects of Vacancies on Properties of Relaxor Ferroelectrics: A First-Principles Study
Topic: Materials Science
Published: 2/13/2007
Authors: L Bellaiche, Jorge Iniguez, Eric J Cockayne, Benjamin P Burton
Abstract: A first-principles-based model is developed to investigate the influence of lead vacancies on the properties of relaxor ferroelectric Pb(Sc1/2Nb1/2)O3 (PSN). Lead vacancies generate large, inhomogeneous, electric fields that reduce barriers between ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850976



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