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Displaying 49051 - 49075 of 73697

Computerizing Concrete Technology Knowledge

December 1, 1999
Author(s)
G J. Frohnsdorff, L J. Kaetzel
The ability to organize, store, process, and exchange knowledge of concrete using computers is growing rapidly. Without fully knowing what will be possible in the future, it is apparent that computers will bring great changes to the way knowledge of

Creation of an Ultracold Neutral Plasma

December 1, 1999
Author(s)
T C. Killian, S Kulin, S D. Bergeson, Luis A. Orozco, C R. Orzel, S L. Rolston
We report the creation of an ultracold neutral plasma by photoionization of laser-cooled xenon atoms. The charge carrier density is as high as 2 x 10 9 cm -3, and the temperatures of electrons and ions are as low as 100 mK and10 K, respectively. Plasma

Cyclic Fatigue of Intrinsically Brittle Ceramics in Contact with Spheres

December 1, 1999
Author(s)
D K. Kim, Yeon-Gil G. Jung, I M. Peterson, Brian R. Lawn
Contact damage modes in cyclic loading with spheres are investigated in three relatively brittle ceramics, soda-lime glass, porcelain and fine-grain silicon nitride, in moist environments. Initial damage at small numbers of cycles and low loads consists of

Deterioration of Iowa Highway Concrete Pavements: A Petrographic Study

December 1, 1999
Author(s)
Paul E. Stutzman
Major highway concrete pavements in Iowa have exhibited premature deterioration attributed to effects of ettringite formation, alkali-silica expansive reactions, and to frost attack, or some combination of them. These pavements were constructed in the mid

Determination of the Scattering Lengths of 39 K from 1 u Photoassociation Lineshapes

December 1, 1999
Author(s)
Carl J. Williams, Eite Tiesinga, Paul S. Julienne, H Wang, W C. Stwalley, P L. Gould
We report threshold scattering properties for 39K(f = 1) atoms obtained from analysis of experimental photoassociation spectra of the purely long-range 39K 21 u state. The existence of hyperfine structure in the excited K 2 1 u state and a knowledge of the

Domain-Engineered Pyroelectric Radiometer

December 1, 1999
Author(s)
John H. Lehman, George P. Eppeldauer, J A. Aust, M. Racz
We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer standard for measurements in the near- and the mid-infrared wavelength regions.

Electrical Control of the Spatial Uniformity of Reactive Species in Plasmas

December 1, 1999
Author(s)
Mark A. Sobolewski, Kristen L. Steffens
We report a new method for controlling the spatial distribution of reactive chemical species in a parallel-plate reactor, by means of a variable-impedance load placed between the unpowered electrode and ground. The technique was demonstrated in 89% CF(sub4
Displaying 49051 - 49075 of 73697
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