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You searched on: Topic Area: Materials Science Sorted by: date

Displaying records 411 to 420 of 446 records.
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411. Stresses in shape memory polymer-matrix nanocomposites for biomedical applications
Topic: Materials Science
Published: 6/1/2004
Authors: Davor Balzar, G Stefanic, Kenneth Gall, Martin Dunn, Yiping Liu
Abstract: We report on the residual stresses in amorphous shape memory polymers reinforced with SiC particles. After 50 % compression of the composite material at 25 ¿C, the SiC particles exhibit a compressive stress, which is almost completely released during ...

412. Residual stress determination by diffraction: Modeling and applications
Topic: Materials Science
Published: 1/1/2004
Authors: Davor Balzar, N C Popa
Abstract: Residual stress plays an important role in shaping Iilaterials properties. We present both the method to determine texture-weighted strain orientation distribution function for arbitrary crystal and sample symmetries and an example of the determinati ...

413. Nanometrology - FY 2003 Program and Selected Accomplishments
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Materials Science
Published: 12/15/2003
Authors: C M Allocca, Stephen Weil Freiman
Abstract: The emphasis on nanotechnology around the world is leading to the development and commercialization of unique products based upon significantly smaller devices and material ensembles. Materials at the nanoscale in three dimensions (NEMS, MEMS), two ...

414. First-Principles Calculations of the Dielectric Properties of Perovskite-Type Materials
Topic: Materials Science
Published: 11/1/2003
Author: Eric J Cockayne
Abstract: We compare first-principles (FP) calculations of the ionic effective charges, phonon frequencies, and static dielectric permittivities k^ds^ of several perovskite-type materials. Transition metal ions have anomalously large effective charges, though ...

415. Combinatorial Chemistry
Topic: Materials Science
Published: 10/13/2003
Authors: J D. Hewes, Debra L Kaiser, Alamgir Karim, Eric J. Amis
Abstract: In 1995, the rapid fabrication of tens, hundreds, and, eventually, tens of thousands of samples in two-dimensional arrays of discrete microscaled samples (pixels) using lithography methods developed for the electronics industry was reported. Importan ...

416. BridgeLCC 2.0 Users Manual: Life-Cycle Costing Software for the Preliminary Design of Bridges (NIST GCR 03-853)
Series: Grant/Contract Reports (NISTGCR)
Report Number: 03-853
Topic: Materials Science
Published: 9/1/2003
Author: M A Ehlen
Abstract: BridgeLCC 2.0 is user-friendly software developed by the National Institute of Standards and Technology to help bridge designers determine the cost effectiveness of alternative bridge designs, construction and repair strategies, and construction mat ...

417. Combining Magnets and Dielectrics: Crystal Chemistry in the BaO-Fe^d2^O^d3^-TiO^d2^ System
Topic: Materials Science
Published: 4/1/2003
Authors: T Siegrist, Terrell Ann Vanderah
Abstract: Phases observed in the Ba-Fe-Ti-O system are classified and described within the framework of close packed [O,Ba/O] layers, with the transition metals in either octahedral (titanium and iron) or tetrahedral (iron only) sites. The resulting crystal c ...

418. Intermetallics Formation and Growth at the Interface of Tin-Based Solder Alloys and Copper Substrates
Topic: Materials Science
Published: 2/17/2003
Authors: Juan C Madeni, S X Liu, Thomas A. (Thomas A.) Siewert
Abstract: Increasing concerns regarding environmental contamination is driving the soldering research community to develop lead-free solder alloys. Previous studies have shown that Sn-based alloys such as Sn-3.5Ag, Sn-0.7Cu, Sn-9Zn, and Sn-3.2Ag-O. ...

419. Subsolidus Phase Equilibria and Crystal Chemistry in the System BaO-TiO^d2^-Ta^d2^O^d5^
Topic: Materials Science
Published: 1/1/2003
Authors: Terrell Ann Vanderah, Robert S. Roth, T Siegrist, W Febo, J. M. Loezos, Winnie K Wong-Ng
Abstract: Subsolidus phase relations have been determined for the BaO: TiO^d2^Ta^d2^O^d5^ system. Approximately 100 specimens were prepared in air at temperatures near but below the solidus (1275 C to 1500 C). For the binary BaO: Ta^d2^O^d5^ subsystem, the ...

420. Phase Equilibria and Crystal Chemistry in the BaO-Al^d2^O^d3^-Nb^d2^O^d5^ and BaO-Nb^d2^O^d5^ Systems
Topic: Materials Science
Published: 11/1/2002
Authors: Terrell Ann Vanderah, B C Collins, Winnie K Wong-Ng, Robert S. Roth, L Farber
Abstract: Subsolidus phase equilibria in the BaO:Al^d2^O^d3^:Nb^d2^O^d5^ system at ~1250 C in air have been determined. Ternary compound formation in this system is limited to one new phase, Ba^d5.75^Al^d0.75^Nb^d9.25^O^d30^ (Ba^d6-x^Al^d1-x^Nb9+xO30, x=0.25; ...

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