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Displaying 56426 - 56450 of 74176

Hydrodynamic similarity in an oscillating body viscometer

September 1, 1995
Author(s)
Robert F. Berg
Hydrodynamic similarity can be used to calibrate simply and accurately an oscillating-body viscometer of arbitrarily complicated geometry. Usually, an explicit hydrodynamic model based on a simple geometry is required to deduce viscosity from the transfer

Low Heat-Flux Measurements: Some Precautions

September 1, 1995
Author(s)
Thomas J. Ohlemiller, A F. Robertson
Simple experiments are described for the purpose of illustrating measurement errors and their avoidance during use of Gardon or Schmidt0Boelter toal heat flux sensors. These errors can assume serious proportions of the observed signal at flux levels below

Microform Calibration Uncertainties of Rockwell Diamond Indenters

September 1, 1995
Author(s)
Jun-Feng Song, F Rudder, Theodore V. Vorburger, J Smith
National and international comparisons in Rockwell hardness tests show significant differences. Uncertainties in the geometry of the Rockwell diamond indenters are largely responsible for these differences. By using a stylus instrument, with a series of

Microlithography by Using Neutral Metastable Atoms and Self-Assembled Monolayers

September 1, 1995
Author(s)
K K. Berggren, A Bard, J L. Wilbur, John D. Gillaspy, A G. Helg, Jabez J. McClelland, S Rolston, William D. Phillips, M Prentiss, G M. Whitesides
Lithography can be performed with beams of neutral atoms in metastable excited states to pattern self-assembled monolayers (SAMs) of alkanethiolates on gold. An estimated exposure of a SAM of dodecanethiolate (DDT) to 15 to 20 metastable argon atoms per

Rapidly Renewable Polishing Lap

September 1, 1995
Author(s)
Christopher J. Evans, R E. Parks
Textured laps can be created by slumping uniform thin films of appropriate materials over textured substrates that have been generated to the required figure. The film can easily be replaced and the lap shape is invariant since the lap substrate never

Temperature and frequency dependence of anelasticity in a nickel oscillator

September 1, 1995
Author(s)
Robert F. Berg
The frequency dependence of the real and imaginary parts of a nickel oscillator’s transfer function is described over 3 decades in frequency by the use of simple expressions. These expressions incorporate only the resonance frequency omega0, the quality

Virtual Assembly Design Environment

September 1, 1995
Author(s)
Kevin W. Lyons
Virtual reality is a technology which is often regarded as a natural extension to 3D computer graphics with advanced input and output devices. This technology has only recently matured enough to warrant serious engineering applications. The integration of
Displaying 56426 - 56450 of 74176
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