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Displaying 47626 - 47650 of 73830

Effect of Interfacial Layers on Wear Behavior of a Dental Glass-Ceramic

July 1, 2000
Author(s)
A Ravikiran, S Jahanmir
Wear studies on a glass-ceramic dental restorative material were performed under two types of lubrication conditions with distilled water. In one set of experiments, the contact interface was continuously flushed with fresh water to remove the wear debris

Effect of Surface Free Energy Anisotropy on Dendrite Tip Shape

July 1, 2000
Author(s)
Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
In previous work, we found approximate solutions for paraboloids having perturbations with four-fold axial symmetry in order to model dendritic growth in cubic materials. These solutions provide self-consistent corrections through second order in a shape

Effects of Bond Strength on Densification and Flow of Powder Compacts

July 1, 2000
Author(s)
R B. Clough, Richard J. Fields
Plastic flow surfaces for metal and metal/composite powder compacts with variable cohesive strength are derived using the Beltrami total strain energy criterion, modified to permit asymmetric yielding. The present theory thus includes the domains of both

Electron-Impact Total Ionization Cross Sections of SF x (x = 1-5)

July 1, 2000
Author(s)
M A. Ali, Karl Irikura, Yong Sik Kim
Total cross sections for electron impact ionization are necessary quantities for numerical modeling of plasma chemistry and for quantitative mass-spectrometric gas analysis. Theoretical cross sections for SF, SF 2, SF 3, SF 4, and SF 5 are calculated by

Enterprise Resource Planning Systems in Manufacturing

July 1, 2000
Author(s)
Edward J. Barkmeyer Jr., Mary B. Algeo
Enterprise resource planning (ERP) systems are commercial applications that provide the backbone necessary to support the enterprise-wide integration of processes and information required for day-to-day operations as well as for tactical level planning of

Evaluating Evaluation Measure Stability

July 1, 2000
Author(s)
C E. Buckley, Ellen M. Voorhees
This paper presents a novel way of examining the accuracy of the evaluation measures commonly used in information retrieval experiments. It validates several of the rules-of-thumb experimenters use, such as the number of queries needed for a good

Evaluation of Standards for a 10 V MAP Service at NIST

July 1, 2000
Author(s)
Yi-hua D. Tang, June E. Sims
A Measurement Assurance Program (MAP) provides a method of assessing and maintaining the quality of a measurement process. Such a program has two parts: the operation of a set of statistical tools to ensure the predictable behavior of the standards and

Experimental Tests of Atomic Structure Calculations

July 1, 2000
Author(s)
Wolfgang L. Wiese
Emission experiments, performed at NIST and the Ruhr University, have provided sensitive tests of recent atomic structure calculations. Somewhat surprisingly, numerous large discrepancies have been found between experiment and theory, and also between

Fast Imaging of Hard X-Rays With a Laboratory Microscope

July 1, 2000
Author(s)
A S. Bakulin, S M. Durbin, Terrence J. Jach, J Pedulla
An improved x-ray microscope with a fully electronic CCD detector system has been constructed that allows improved laboratory-based microstructural investigations of materials with hard x-rays. It uses the Kirkpatrick-Baez multilayer mirror design to form

Flammability of Polymer Clay Nanocomposites Consortium: Year One Annual Report (NISTIR 6531)

July 1, 2000
Author(s)
Jeffrey W. Gilman, Takashi Kashiwagi, A B. Morgan, Richard H. Harris Jr., L D. Brassell, Mark R. VanLandingham, C L. Jackson
We recently found that polymer layered-silicate (clay) nanocomposites have the unique combination of reduced flammability and improved physical properties. However, the details of the fire retardant mechanism were not well understood. In October of 1998 a

Fracture and the Structure of Silica

July 1, 2000
Author(s)
Stephen W. Freiman
Not only because of its historic and widespread use in applications where its strength and brittle nature are significant factors, but also because it is homogeneous in composition and structure, and isotropic in its properties, glass is an ideal medium in

Identification of Parameters in Multilayer Media

July 1, 2000
Author(s)
Edward Della Torre, R A. Fry, O Alejos, E Cardelli
Multilayer media are of increasing importance as magneto-optic and perpendicular media. The properties of successive layers evolve as the layers are epitaxially deposited. This complicates both the model for these media and the identification of the model

Identifying Critical Patches With ICAT

July 1, 2000
Author(s)
Peter M. Mell
[For the latest information on vulnerabilities, see the National Vulnerability Database, nvd.nist.gov]The NIST computer security division has created a searchable index containing 700 of the most important computer vulnerabilities. This index, called the
Displaying 47626 - 47650 of 73830
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