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Topic Area: Materials Science

Displaying records 431 to 440 of 482 records.
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431. Talking Ceramics
Topic: Materials Science
Published: 11/1/2002
Author: Terrell A Vanderah
Abstract: This is an invited Perspective article describing the technical needs and state-of-the-art research activities in the materials science of microwave ceramics, especially dielectric materials which serve as critical elements in resonators and filters ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850668

432. Application of an On-Line Weld Monitoring System
Topic: Materials Science
Published: 9/12/2002
Authors: Thomas Allen Siewert, Ivan Samardzic, Stefanija Klaric
Abstract: quisition analysis and real-time manipulation of the welding parameters offer added controls over the weld quality. Thanks to the continual development of information technology and electronics, it is possible to improve the systems for monitoring ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851294

433. Acoustic Spectroscopy of Lithium Niobate: Elastic and Piezoelectric Coefficient
Topic: Materials Science
Published: 9/1/2002
Authors: H Ogi, Y Kawashima, M Hirao, H M Ledbetter
Abstract: We report the first Simultaneous measurement of a crystal's complete elastic and piezoelectric coefficients: C^dif^, e^dijk^. The studied crystal was lithium niobate (LiNbO^d3^) with trigonal crystal symmetry (3 m point group), thus six independent ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851242

434. Crystal Structure of Ba^d27^Fe^d16^Ti^d33^O^d117^
Topic: Materials Science
Published: 7/1/2002
Authors: T Siegrist, Terrell A Vanderah, C Svensson, Robert S. Roth
Abstract: Single-crystal X-ray diffraction studies indicate that the compound Ba^d27^Fe^d16^Ti^d33^O^d117^- crystallizes in the rhombohedral space group R-3m, with a hexagonal unit cell a=5.7400(8) , c=127.11(3) ; Z=1.5. The arrangement may be described as ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850585

435. Lattice Statice Green's Function Method for Multiscale Modeling of Point Defects and Extended Defects in Solids
Topic: Materials Science
Published: 7/1/2002
Author: Vinod K Tewary
Abstract: A method for multiscale modeling of point defects such as vacnacies and interstitials at the atomistic level and extended defects such as free surfaces and interfaces at the macroscopic continuum level in a solid is described. The method is based up ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851303

436. Reliability Improvements in Repair Welding of High Strength Steels
Topic: Materials Science
Published: 7/1/2002
Authors: Ivan Samardzic, Thomas Allen Siewert
Abstract: Engineers often have to deal with repair of weldments after they have been put into service. Here, the concern is that the service environment may have changed the structure, indepent of whether the problems originated during the initial constructio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851372

437. Formation of Solid Electrolyte Interface on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study
Topic: Materials Science
Published: 5/3/2002
Authors: Mahalingam Balasubramanian, James McBreen, Xiao-Qing Yang, H S Lee, A R Moodenbaugh, Daniel A Fischer, Ziwen Fu, D Abraham
Abstract: Lithium-ion batteries are promising candidates for hybrid electric vehicles (HEV). Batteries that exceed the requirements for HEV, as set by the Partnership for a New Generation of Vehicles (PNGV), have been designed and built. These batteries are ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850681

438. Multiscale Modeling of Point Defects and Free Surfaces in Semi-Infinite Solids
Topic: Materials Science
Published: 2/4/2002
Author: Vinod K Tewary
Abstract: A Green's function method is described for multiscale modeling of point defectssuch as vacancies and interstitials at the atomistic level and extended defects such as free surfaces and interfaces at the macroscopic continuum level in a solid. The po ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851258

439. Effective Hamiltonian Study of PZT 95/5
Topic: Materials Science
Published: 1/21/2002
Authors: K Leung, Eric J Cockayne, A F Wright
Abstract: An effective Hamiltonian is constructed for PbZr0.95Ti0.05O3. It is parameterized using ab initio results computed in the virtual crystal approximation. The phase diagram depends sensitively on the energetic competition between the stable orthorhomb ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850560

440. Comments on a Recent Infinitesimal-Deformation Approach to Martensite Crystallography
Topic: Materials Science
Published: 1/1/2002
Authors: H M Ledbetter, Martin Dunn
Abstract: We dispute recent claims by Navruz that his infinitesimal-deformation theory gives better predictions than the classical Wechsier-Lieberman-Read/Bowles-Mackenzie invariant-plane-strain theories. Indeed, we argue that the Navruz theory gives habit pl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851203



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