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Bioscience

Biomaterials

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Displaying 1451 - 1475 of 1737

Broadband Dielectric Relaxation of Polymer Composite Films

January 1, 2001
Author(s)
C. K. Chiang, R Popielarz, R Nozaki, Jan Obrzut
The broadband dielectric relaxation of a BaTiO3-polymer composite film was studied. The complex dielectric constant data from 10 -4 Hz to 10 10 Hz reveals the existence of a relaxation process at a frequency of 10 MHz in the polymer composite. On the basis

Ceramics Division FY 2000 Programs and Accomplishments

January 1, 2001
Author(s)
Stephen W. Freiman, S J. Dapkunas
The mission of the Ceramics Division is: Work with industry, standards bodies, academia, and other government agencies in providing the leadership for the Nation's measurements and standards infrastructure for ceramic materials. The range of ceramic

Contact Fracture of Brittle Bilayer Coatings on Soft Substrates

January 1, 2001
Author(s)
P Miranda, Antonia Pajares, F Guiberteau, F Cumbrera, Brian R. Lawn
Contact-induced fracture modes in trilayers consisting of a brittle bilayer coating on a soft substrate was investigated. Experiments are performed on model transparent glass/sapphire/polycarbonate structures bonded with epoxy adhesive, to enable in situ

Damage Evolution During Microcracking of Brittle Solids

January 1, 2001
Author(s)
A Zimmermann, W Carter, Lin-Sien H. Lum
Microcracking due to thermal expansion anisotropy is considered based on a finite element model. A polycrystalline microstructure is generated via Monte Carlo simulation. Microcrack formation is investigated using a Griffith-type failure criterion. The

Domain Stability in PZT Thin Films

January 1, 2001
Author(s)
Grady S. White, J Blendell, Lin-Sien H. Lum
M measurements were made on textured PZT thin films excited by a 1 V rms in the presence of various DC biasing voltages. Apparent domain pinning sites were found in the films. All sites were located at grain boundaries and were coincident with abnormally

Guide to Rheological Nomenclature: Measurement in Ceramic Particulate Systems

January 1, 2001
Author(s)
Vincent A. Hackley, Chiara F. Ferraris
This document provides definitions of terms and expressions relating to the measurement of rheological properties in liquid-based ceramic particulate systems (i.e., suspensions, pastes, and gels). The definitions are largely generic and should be

Influence of Crack Path on Crack Resistance of Brittle Matrix Composites

January 1, 2001
Author(s)
S Wu, D Patterson, M Ferber, Lin-Sien H. Lum
Studies on particulate reinforced ceramic composites, mainly glass/Al 2O 3, have shown pronounced crack path variations with variations in microstructure and loading rate. The variations in path strongly influenced the crack resistance of the composite

Modeling Thermal Barrier Coatings with Object Oriented Finite Elements Methods

January 1, 2001
Author(s)
M R. Locatelli, Lin-Sien H. Lum
Thermal barrier coatings (TBC s) are used to protect metallic components from extreme conditions like those encountered in turbine engines. TBC s serve two purposes in these applications. They prevent the oxidation of the superalloy and create a thermal
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