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Displaying 50651 - 50675 of 73994

Ultrasonic Measurement of Stress in Railroad Wheels

February 1, 1999
Author(s)
R E. Schramm
Acoustic birefringence is the relative change in sound velocity with polarized direction. While the effect is small (usually parts in 10 4), this is a useful tool to probe stress and metallurgical texture since these generate anisotropic changes in the

Viscoelasticity of Xenon Near the Critical Point

February 1, 1999
Author(s)
Robert F. Berg, Michael R. Moldover, G A. Zimmerli
Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency range 2 Hz [less than or equal to} f {less than or equal to} 12 Hz. The measured viscosity

Voight Function Model in Diffraction-Line Broadening Analysis

February 1, 1999
Author(s)
Davor Balzar
Diffraction-line broadening routes are briefly reviewed. Both luboratory and synchrotron X-ray measurements of W and MgO showed that a Voigt function satisfactory fits the physically broadened line profiles. The consequences of an assumed Voigt function

Simulated-eye-design Camera for High-Contrast Measurements

January 30, 1999
Author(s)
Edward F. Kelley
Light-measurement instrumentation based upon high-quality charge-coupled-devices (CCD) is currently in use for measuring the characteristics of electronic displays. When such array detectors are used to measure scenes having high contrasts or wide color

Using Raman Imaging to Detect Oxidative Stress Events in Plant Tissues

January 30, 1999
Author(s)
B M. Allen, Anne L. Plant
Raman Imaging represents the union of Raman spectroscopy and optical microscopic imaging. This non-invasive vibrational scattering technique allows one to simultaneously spatially (approximately} 1 micron) and spectrally (approximately} 7 wavenumbers)

The Use of Cyclic Phosphazene Additives to Enhance the Performance of the Head/Disk Interface

January 29, 1999
Author(s)
H J. Kang, Q Zhao, F E. Talke, D J. Perettie, B M. DeKoven, T A. Morgan, Daniel A. Fischer, Stephen M. Hsu, C S. Bhatia
Phase separation of phosphazene additives in perfluoropolyalkylether (PFPAE) lubricants is investigated as a function of additive concentration and lubricant layer thickness. The tribological behavior of various phosphazene additive/lubricant mixtures is

On The Reversion of an Asymptotic Expansion and the Zeros of the Airy Functions

January 15, 1999
Author(s)
Bruce R. Fabijonas, Frank W. Olver
The general theories of the derivation of inverses of functions from their power series and asymptotic expansions are discussed and compared. The asymptotic theory is applied to obtain asymptotic expansions of the zeros of the Airy functions and their

Secure Web-Based Access to High-Performance Computing Resources

January 15, 1999
Author(s)
R P. McCormack, J E. Koontz, J E. Devaney
An authentication framework is described that provides a secure meansor clients to access remote computing resources via the Web. Clientsauthenticate themselves to a proxy Web server using a secure protocoland a digital certificate. The server constructs a

Ultra-Thin Film Dielectric Reliability Characterization

January 15, 1999
Author(s)
John S. Suehle
The reliability of gate oxides is becoming a critical concern as oxide thickness is scaled below 4 nm in future technology nodes. The breakdown detection algorithms in traditional reliability characterization techniques must be modified for very thin films

A Java-Based Tool for Testing the Interoperable MPI Protocol

January 12, 1999
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
Java and the World Wide Web are used as the basis of a tool that tests conformance with the InteroperableMessage Passing Interface communication protocol. The user accesses the system through a Java applet thatActs as the interface to a test server that is

Electronic Structure and Spectra of Oxovanadium Silicate

January 11, 1999
Author(s)
Morris Krauss
The electronic structure and spectroscopy of the oxovanadium catalytic center on a silica surface is modeled with the molecule OV(OSIH 3)3. Excited electronic states are examined at optimized geometries for the ground singlet and triplet states. For both
Displaying 50651 - 50675 of 73994
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