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Displaying 47926 - 47950 of 73927

Comparison of Quantum Hall Effect Resistance Standards of the NIST and the BIPM

January 1, 2000
Author(s)
F. Delahay, Thomas J. Witt, Randolph Elmquist, Ronald F. Dziuba
An on-site comparison of the quantum Hall effect (QHE) resistance standards of the National Institute of Standards and Technology (NIST) and of the Bureau International des Poids et Mesures (BIPM) was made in April 1999. Measurements of a 100 ω standard in

Comparison of Tensile and Compressive Creep Behavior in Silicon Nitride

January 1, 2000
Author(s)
K J. Yoon, Sheldon M. Wiederhorn, William E. Luecke
The creep behavior of most commercial grade of Si 3 N 4 was studied at 1350 and 1400 C. Stresses ranged from 10 to 200 Mpa in tension and from 30 to 300 Mpa in compression. In tension, the creep rate increased linearly with stress at low stresses and

Composition of Plaque and Saliva Following Use of an A-tricalcium Phosphate-Containing Chewing Gum and a Subsequent Sucrose Challenge

January 1, 2000
Author(s)
Gerald L. Vogel, Z Zhang, Clifton M. Carey, A K. Ly, Laurence C. Chow, H M. Proskin
Previous studies demonstrated that chewing of a 2.5% (mass fraction) α-tricalcium phosphate-fortified (a-TCP) experimental chewing gum released sufficient calcium and phosphate to eliminate any fall in the tooth mineral saturation of plaque fluid after a

Computation of Light Scattered Into Detector

January 1, 2000
Author(s)
Egon Marx
To compare the measured bidirectional reflectance distribution function (BRDF) of a rough surface to the results of a computation, we have to take into account the aperture of the detector and, more generally, the properties of the measuring instrument. We
Displaying 47926 - 47950 of 73927