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Displaying 39901 - 39925 of 74179

Comparison of Macro-Tip/Tilt and Mesoscale Position Beam-Steering Transducers for Free-Space Optical Communications Using a Quadrant Photodiode Sensor

January 1, 2004
Author(s)
K B. Fielhauer, B G. Boone, J R. Bruzzi, Jeffery Kluga, J R. Connelly, M M. Bierbaum, Jason J. Gorman, Nicholas Dagalakis
The National Aeronautics and Space Administration (NASA) plans to develop optical communication terminals for future spacecraft, especially in support of high data rate science missions and manned exploration of Mars. Future, very long-range missions, such

Condensation Flame of Acetylene Decomposition

January 1, 2004
Author(s)
Valeri I. Babushok, A W. Miziolek
Acetylene decomposition flame propagation was studied as the result of the condensation reaction. The used kinetic models reasonably predict the level of burning velocity of acetylene decomposition flame. Nevertheless the models do not demonstrate pressure

Convergent-Beam Neutron Crystallography

January 1, 2004
Author(s)
W M. Gibson, A J. Schultz, J W. Richardson, J M. Carpenter, D F. Mildner, Heather H. Chen-Mayer, M E. Miller, E R. Maxey, R Youngman

Crack Opening Profiles of Indentation Cracks in Normal and Anomalous Glasses

January 1, 2004
Author(s)
Z Burghard, A Zimmermann, J Rodel, F Aldinger, Brian R. Lawn
A comparative Vickers indentation study is made of two glasses, soda-lime andborosilicate. Indentations in the two glasses reveal substantially shorter radial cracks in the borosilicate, even though toughness values measured by conventional

DC Conductivity Measurements of Metals

January 1, 2004
Author(s)
Michael D. Janezic, Raian K. Kaiser, James R. Baker-Jarvis, George Free
In this paper we examine a measurement method for characterizing the dc conductivity of metal alloys commonly-used in hand weapons. From accurate measurements of the voltage and current across a cylindrical metal sample, we calculate the metal's dc
Displaying 39901 - 39925 of 74179
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