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Bioscience

Biomaterials

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Displaying 1676 - 1700 of 1729

Indentation Creep Behavior of a Direct-Filling Silver Alternative to Amalgam

December 1, 1998
Author(s)
Hockin D. Xu, Kate Liao, F Eichmiller
Amalgam creep has been identified as a key parameter associated with marginal breakdown and corrosion. Recently, a consolidated silver powder was proposed as a mercury-free alternative to amalgam. The aim of the present study was to characterize the time

Mechanical Properties of Si 02 and Si 3 N 4 Coatings: A BAM/NIST Cooperative Project

September 24, 1998
Author(s)
U Beck, Douglas T. Smith, G Reiners, S J. Dapkunas
Mechanical properties, i.e., hardness and elastic modulus, of amorphous Si 02 and Si 3N^4^ PE-CVD coatings have been studied for two coating thicknesses (0.1 υm and 1.0 υm) and two substrate materials (fused silica, i.e., Herasil, and borosilicate glass, i

Interface Adhesion of E-Glass Fibers in Model Polyisocyanurate Networks

September 23, 1998
Author(s)
Walter G. McDonough, Gale A. Holmes, R C. Peterson
Recent work examining the nature of the failure process of glass/epoxy specimens in the single fiber fragmentation test showed that the matrix exhibited pronounced non-linear viscoelastic behavior during the test, and that the interfacial shear strength

Electroacoustic Analysis in Processing of Advanced Ceramics

September 1, 1998
Author(s)
Vincent A. Hackley, U Paik
Finely dispersed systems such as emulsions and colloidal suspensions are recognized as playing a critical role in many important industrial processes. Many of these systems are quite concentrated, and significant needs exist to develop measurement

Multiple Small-Angle Neutron Scattering

September 1, 1998
Author(s)
Gabrielle G. Long, Susan Krueger, Andrew J. Allen
Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly useful in

Diffraction Anomalous Fine Structure Study of Strained GA 1-x In x As on GaAs(001)

August 20, 1998
Author(s)
Joseph C. Woicik, J O. Cross, Charles E. Bouldin, Bruce D. Ravel, J G. Pellegrino, B W. Steiner, S G. Bompadre, L B. Sorensen, K E. Miyano, J P. Kirkland
Diffraction anomalous fine-structure measurements performed at both the Ga and As K edges have determined the Ga-As bond length to be 2.442 ± 0.005 {Angstrom} in a buried, 213 {Angstrom} thick Ga^0.78^In 0.22As layer grown coherently on GaAs(001). This

Coolant Flow in Surface Grinding with Non-Porous Wheels

August 1, 1998
Author(s)
P Hryniewicz, A Z. Szeri, S Jahanmir
A parameter that is often used in the assessment of cooling efficiency in grinding is the amount of fluid that flows through the grinding zone. This paper shows that when grinding with wheels possessing no bulk porosity, only a portion of the flow through

Hardness Testing of Ceramics

August 1, 1998
Author(s)
George D. Quinn
An overview of hardness testing of ceramics is presented. Conventional test methods are discussed, particularly with respect to major sources of experimental error and standardization. Two NIST Standard Reference Materials (SRMs) are highlighted. Emerging
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