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Displaying 45826 - 45850 of 73994

Comparison Between the SNS and SIS Josephson Voltage Standards at OFMET

April 1, 2001
Author(s)
Blaise Jeanneret, Alain Rufenacht, Charles J. Burroughs
Recently, a new Josephson voltage standard based on a lV programmable chip provided by the National Institute of Standards and Technology (NIST) was impemented at the Swiss Federal Office of Metrology (OFMET). A comparison with a conventional Josephson

Comparison of FDS Model Predictions With FM/SNL Fire Test Data.

April 1, 2001
Author(s)
Frederick W. Mowrer, P A. Friday
The Fire Dynamics Simulator (FDS), a recently developed field tire model based on large eddy simulation (LES), is used to simulate seven full-scale fire tests. The fire tests were conducted in a large mechanically ventilated enclosure with dimensions of 18

Concrete Mixing Methods and Concrete Mixers: State of the Art

April 1, 2001
Author(s)
Chiara F. Ferraris
The performance of concrete is determined by its microstructure. Its microstructure, in turn, is determined by its composition, its curing conditions, and also by the mixing method used to process the concrete. This paper gives an overview of the various

Conformance Testing and Certification Framework

April 1, 2001
Author(s)
Lisa J. Carnahan, Lynne S. Rosenthal, Mark Skall
This white paper presents the general concepts, components, and issues related to establishing and administering a conformance testing and certification program. It identifies the types of activities, responsibilities, services, and documentation required

Correlations Between the Magnetic and Structural Properties of Ca Doped BiMnO 3

April 1, 2001
Author(s)
H Woo, T A. Tyson, Mark Croft, S W. Cheong, Joseph Woicik
Bi1-xCaxMnO3 (BCMO) is known to exhibit charge ordering for a much broader range of x than the classicLa1-xCaxMnO3 (LCMO) system. However, the properties of BCMO over the entire doping range are not well understood. We have performed magnetization and

Curing of High-Performance Concrete for Strength: Phase I Study

April 1, 2001
Author(s)
Nicholas J. Carino, K W. Meeks
This paper reports the results of an exploratory study on the effects of curing duration on the variation of mortar strength with distance from the drying surface. A novel, notched cylindrical test specimen was adopted for measuring tensile strength at

Dental Resin Composites Containing Silica-Fused Whiskers: Effects of Whisker-to-Silica Ratio on Fracture Toughness and Indentation Properties

April 1, 2001
Author(s)
Hockin D. Xu, Janet Quinn, Douglas T. Smith, Joseph M. Antonucci, Gary E. Schumacher, F Eichmiller
Dental resin composites need to be strengthened in order to improve their performance in large stress-bearing applications such as crowns and multiple-unit restorations. Recently, silica-fused ceramic whiskers were used to reinforce dental composites, and

Design of a File Format for Logging Website Interaction

April 1, 2001
Author(s)
John V. Cugini, Sharon J. Laskowski
The logging of user behavior in support of Web usability testing is constrained by the difficulty of capturing and analyzing large amounts of logged data. However, there is great potential for the development of tools to support automated recording and

Design of Nanoporous Ultra Low-Dielectric Constant Organosilicates by Self-Assembly

April 1, 2001
Author(s)
S Y. Yang, T L. Dull, J Sun, Albert F. Yee, P Mirau, C S. Pai, O Nalamasu, E Reichmanis, Eric K. Lin, V. J. Lee, D Gidley, W E. Frieze
Here we report a new class of materials that can reach ultra low- dielectric constants while maintaining good mechanical properties. In this approach, amphiphilic triblock copolymers, poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO

Design Procedures for Structures with Supplemental Dampers

April 1, 2001
Author(s)
Fahim Sadek, Michael A. Riley
Passive energy dissipation devices are used to reduce the damage from earthquakes by absorbing a portion of the earthquake-induced energy in structures. Wide acceptance of these devices in structures will depend on the availability of simplified methods

Difficulties Making Reliability Predictions For Si, GaAs, and Inp

April 1, 2001
Author(s)
Grady S. White, L M. Braun
The lifetime prediction model that has been developed for brittle materials implicitly assumes an initial flaw population from which, under the influence of an applied or residual stress, cracks grow to failure. The relationship between crack growth rate

Directory of U.S. Private Sector Product Certification Programs

April 1, 2001
Author(s)
C W. Hyer
This document, a revision of the 1996 edition of NIST SP 903: Directory of U.S. Private Sector Product Certification Programs, presents information on 122 private sector groups in the United States which engage in product certificaiton activities. Entries

Effect of Flow Due to Density Change on Eutectic Growth

April 1, 2001
Author(s)
Sam R. Coriell, Geoffrey B. McFadden, William F. Mitchell, B T. Murray, J B. Andrews, Y B. Arikawa
The Jackson-Hunt model of eutectic growth is extended to allow for different densities of the phases. The density differences give rise to fluid flow which is calculated from a series solution of the fluid flow equations in the Stokes flow approximation

Effect of Self-Assembled Monolayer Technology on Fiber-Matrix Adhesion

April 1, 2001
Author(s)
Gale A. Holmes, E Feresenbet, D T. Raghavan
The concept of an interphase region between an adherent and a matrix or adhesive was first introduced in 1972 by Sharpe. Since this introduction, the role of the interphase region in controlling the performance of fibrous composites has been extensively
Displaying 45826 - 45850 of 73994
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