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Displaying 52026 - 52050 of 74256

Mechanical Properties of Si 02 and Si 3 N 4 Coatings: A BAM/NIST Cooperative Project

September 24, 1998
Author(s)
U Beck, Douglas T. Smith, G Reiners, S J. Dapkunas
Mechanical properties, i.e., hardness and elastic modulus, of amorphous Si 02 and Si 3N^4^ PE-CVD coatings have been studied for two coating thicknesses (0.1 υm and 1.0 υm) and two substrate materials (fused silica, i.e., Herasil, and borosilicate glass, i

Preliminary Investigations Into Corrosion in Anti-Lock Braking Systems

September 24, 1998
Author(s)
Richard E. Ricker, J L. Fink, Alexander J. Shapiro, L C. Smith, Robert J. Schaefer
In response to vehicle owner complaints about the operation and performance of some antilock braking systems (ABS), the National Highway Transportation Safety Administration (NHTSA) began examining components from ABS systems at the Vehicle Research and

Interface Adhesion of E-Glass Fibers in Model Polyisocyanurate Networks

September 23, 1998
Author(s)
Walter G. McDonough, Gale A. Holmes, R C. Peterson
Recent work examining the nature of the failure process of glass/epoxy specimens in the single fiber fragmentation test showed that the matrix exhibited pronounced non-linear viscoelastic behavior during the test, and that the interfacial shear strength

Cryptography Standards and Infrastructures for the Twenty-First Century

September 17, 1998
Author(s)
Shirley M. Radack
This bulletin reports on the progress being made by NIST and by its government and industry partners to advance the development of electronic commerce systems in which users will have confidence. There are efforts underway to update existing standards for

Path Planning for Autonomous Vehicles Driving Over Rough Terrain

September 17, 1998
Author(s)
Alberto Lacaze, Yigal Moscovitz, Nicholas DeClaris, Karl Murphy
This paper presents a multiresolutional architec- ture of planners for obstacle avoidance in outdoor mobility. The planner makes use of o -line dynam- ical simulations results to eciently nd paths that avoid obstacles. The trajectories are generated by set

The Growth Kinetics of Nanocrystalline ZnO Colloidal Solutions

September 11, 1998
Author(s)
E M. Wong, John E. Bonevich, P C. Searson
Colloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. Although the synthesis and unique properties of these materials are well known, the kinetics of the growth process are not well understood. The particle

A Brief History of Early Product Data Exchange Standards

September 1, 1998
Author(s)
Barbara L. Goldstein, Sharon J. Kemmerer, Curtis H. Parks
The following paper traces the history of product data exchange standards from the physical model through electronic representations such as IGES. This paper provides an understanding of the early efforts leading to ISO 10303--Standard for the Exchange of

A New Method of Certifying Standardized Rockwell Hardness Test Blocks

September 1, 1998
Author(s)
Samuel R. Low III, Walter S. Liggett Jr, David J. Pitchure
Rockwell hardness test blocks, whether standardized at the primary national laboratory level or by secondary commercial laboratories, have been certified historically by determining an average hardness value for the test surface of the block. However

A Strain-Based Methodology for High Temperature Lifetime Prediction

September 1, 1998
Author(s)
Sheldon M. Wiederhorn, William E. Luecke, Ralph Krause
In structural materials, lifetime is often strain-determined. Once a part exceeds its allowable strain, its functional integrity is lost. Although most ceramics are designed to a brittle failure criterion, silicon nitride at the temperatures expected in
Displaying 52026 - 52050 of 74256
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