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Displaying 1101 - 1125 of 1721

Recent Advances in Quantitative Synthetic-Polymer Mass Spectrometry at NIST

January 1, 2004
Author(s)
William E. Wallace, Charles M. Guttman
Commensurate with NIST s mission to advance the state of quantitative measurement science we have worked to develop a method to determine absolute molecular mass distribution of synthetic polymers by mass spectrometry. Work has centered on using matrix

Fracture of Ceramic/Ceramic/Polymer Trilayers for Biomechanical Applications

December 1, 2003
Author(s)
Y N. Deng, P Miranda, Antonia Pajares, Brian R. Lawn
Fracture damage in trilayers consisting of outer and inner brittle layers bonded to a compliant (polycarbonate) substrate and subjected to concentrated surface loading is analyzed. The principal mode of fracture is radial cracking at the undersurface of

Nitrogen-Activated Bowing of Dilute In y Ga 1-y As 1- x N x Based on Photoreflectance Studies

December 1, 2003
Author(s)
M M. Fahmi, A Kahn, J A. Griffin, G L. Harris, Larry Robins, Anthony G. Birdwell, Youn S. Kang, D J. Smith, T Steiner, S N. Mohammad
The dependence of the fundamental band gap and higher-lying critical-point energies of dilute-nitrogen Ga 1-yIn yAs 1-xN x epilayers on nitrogen mole fraction (x), for x less than or equal to} 0.0125, and temperature, from 20 K to 295 K, was investigated

MatML: A Data Interchange Markup Language

November 1, 2003
Author(s)
J G. Kaufman, E F. Begley
This paper updates and expands upon previously published information on MatML, a new extensible markup language designed specifically for the exchange of materials information. In particular, it will describe the strengths of MatML from the perspective of

Phase Equilibria, Crystal Structures, and Dielectric Anomaly in the BaZrO 3 -CaZrO 3 System

November 1, 2003
Author(s)
Igor Levin, T G. Amos, S M. Bell, L Farber, Robert S. Roth, Terrell A. Vanderah, B H. Toby
Phase equilibria in the (1-x)BaZrO 3-xCaZrO 3 system were analyzed using a combination of X-ray and neutron powder diffraction, and transmission electron microscopy. The proposed phase diagram features two extended two-phase fields containing mixtures of a

Premixed Calcium Phosphate Cement Pastes

November 1, 2003
Author(s)
Shozo Takagi, Laurence C. Chow, S Hirayama, A Sugawara
A self-hardening calcium phosphate cement (CPC-I), consisting of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA), has been shown in clinical studies to be efficacious as bone repair materials. The hardening time (HT) of the cement is

Abrasive Machining of Porcelain and Zirconia With a Dental Handpiece

September 1, 2003
Author(s)
L Yin, S Jahanmir, L K. Ives
The machining characteristics and material removal mechanisms of two dental ceramics feldspathic porcelain and yttria-stabilized tetragonal zirconia - were investigated using a dental handpiece and diamond burs with different grit sizes. The material
Displaying 1101 - 1125 of 1721