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Displaying 49451 - 49475 of 74141

A Model of Cerificate Revocation

December 1, 1999
Author(s)
David A. Cooper
This paper presents a model for the distribution of revocation information using certificate revocation lists (CRLs). This model is used to highlight inefficiencies in the traditional method of distribution certificate status information using CRLs. Two

A Modular Architecture for STEP

December 1, 1999
Author(s)
Allison Barnard Feeney, David M. Price
This paper presents the current direction in the architecture of STEP (STandard for the Exchange of Product model data, ISO 10303). STEP is an international standard designed to enable the exchange of product data between heterogeneous computer systems

A New Method to Measure the Distance Between Graduation Lines on Graduated Scales

December 1, 1999
Author(s)
William B. Penzes, Robert Allen, Michael W. Cresswell, L Linholm, E C. Teague
Line scales are used throughout industry for a variety of applications. The most common is the stage micrometer, a small graduated glass scale for the calibration of optical instruments such as microscopes. However, stage micrometers are generally not

A Novel Multiaxial Wear Tester for Accelerated Testing of Materials

December 1, 1999
Author(s)
M C. Shen, Stephen M. Hsu, John A. Tesk, A Christou
A versatile wear tester has been designed and built. The initial study showed that that with this tester, tes procedures can be developed to achieve clinically relevant simulations in a short time. With the continuously monitored force traces, this tester

Absolute Intensities for the O 2 1.27 ym Continuum Absorption

December 1, 1999
Author(s)
B Mate, C Lugez, Gerald T. Fraser, Walter J. Lafferty
Collision-induced absorption coefficients for the 1.27 υm band of O 2 have been measured at a resolution of 0.5 cm -1 and an optical pathlength of L = 84 m using a Fourier-transform spectrometer and 2 m long White-type multipass absorption cell. Spectra

Alignment and Orientation Effects in Sr Energy Pooling

December 1, 1999
Author(s)
Harold V. Parks, S R. Leone
Alignment and orientation effects in the energy pooling process, Sr(5s5p 3P 1) + Sr(5s5p 3P 1)-> Sr(5s5p 1P 1) + Sr(5s 2 1S o), are studied in a single atomic beam. The Sr atoms are prepared in an aligned initial state with a polarized laser, and alignment

Application of Microcalorimeter EDS X-Ray Detectors to Particle Analysis

December 1, 1999
Author(s)
Alain C. Diebold, David A. Wollman, Gene C. Hilton, Kent D. Irwin, John M. Martinis, B. H. Liu
New microcalorimeter x-ray detector technology will revolutionize materials characterization. It is expected that the microcalorimeter EDS (energy dispersive spectrometer) will replace traditional lithium-drifted silicon semiconductor EDS due to its
Displaying 49451 - 49475 of 74141
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