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Displaying 61751 - 61775 of 74237

Growth of YBa2Cu3O7 thin films on MgO: the effect of substrate preparation

August 13, 1990
Author(s)
Stephen E. Russek
We discuss the results of a study of the effect of a substrate preparation on the microstructure and superconductive properties of YBa2Cu3O7 think films formed by laser ablation on (001) MgO substrates. Thermal annealing of the substrates is found to be

Critical exponent for the viscosity of carbon dioxide and xenon

August 1, 1990
Author(s)
Robert Berg, Michael Moldover
The viscosities eta of carbon dioxide and xenon have been measured near their critical points and the critical exponent y characterizing the asymptotic divergence, eta |T- Tc|^-y, has been determined. Both fluids yielded exponents in the rangey = 0.041 ± 0

Evaluation of Exit Signs in Clear and Smoke Conditions (NISTIR 4399)

August 1, 1990
Author(s)
Belinda L. Collins, Daniel M. Madrzykowski
The present paper provides a short review of the research literature on the visibility of exit signs, directional markings, and emergency lighting. It also presents a study which assessed the visibility of several types of exit signs including conventional

Preliminary Screening Procedures and Criteria for Replacements for Halons 1211 and 1301 (NIST TN 1278)

August 1, 1990
Author(s)
Richard G. Gann, J D. Barnes, S Davis, J S. Harris, Richard H. Harris Jr., J T. Herron, Barbara C. Levin, F I. Mopsik, Kathy A. Notarianni, Marc R. Nyden, M Paabo, Richard E. Ricker
The current halogenated fire suppressants, halons 1301 and 1211, are among the compounds whose production is restricted by the Montreal Protocol of 1987. The objective of this project is to facilitate identification of alternative chemicals by developing
Displaying 61751 - 61775 of 74237
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