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Displaying 45551 - 45575 of 73697

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

Electron Self-Energy for the K and L Shells at Low Nuclear Charge

April 1, 2001
Author(s)
U Jentschura, Peter J. Mohr, G Soff
A nonperturbative numerical evaluation of the one-photon electron self energy for the K- and L-shell states of hydrogen like ions with nuclear charge numbers Z = 1 to 5 is described. Our calculation for the 1S 1/2 state has a numerical uncertainty of 0.8

Experiences with Using Solar Photovoltaics to Heat Domestic Water

April 1, 2001
Author(s)
Brian P. Dougherty, Arthur H. Fanney
The solar photovoltaic (PV) industry continues to make progress in increasing the efficiency while reducing the manufacturing costs of PV cells. Economies of scale are being realized as manufacturers expand their production capabilities. Products are

Fatigue Resistant, High Temperature Solder

April 1, 2001
Author(s)
Frank W. Gayle
The National Center for Manufacturing Sciences (NCMS) High Temperature Fatigue Resistant Solder Project, carried out by a consortium of eight industrial corporation, academia and NIST, has completed its four-year program to identify and evaluate Pb-free

Ferroelectricity and Ferrimagnetism in Iron-doped BaTiO 3

April 1, 2001
Author(s)
R Maier, J. Cohn, J J. Neumeier, Leonid A. Bendersky
The structural and physical properties of pseudocubic thin-film BaTi 1-xFe x0 3 (0.5 less than or equal} x less than or equal} 0.75) grown by pulsed-laser deposition are reported. This material is of interest because the corresponding bulk compounds have

Flow Measurement Proficiency Testing

April 1, 2001
Author(s)
G E. Mattingly
To eliminate measurement-base trade barriers to international commerce, Key Comparisons (KCS) are now being planned in the newly formed Working Group for Fluid Flow (WGFF) in the CIPM to quantify the equivalency of the flow standards maintained in the

Formation of Rydberg Atoms in an Expanding Ultracold Neutral Plasma

April 1, 2001
Author(s)
M J. Lim, T C. Killian, S Kulin, R Dumke, S Bergeson, S L. Rolston
We study the formation of Rydberg atoms in expanding plasmas at temperatures of 1-1000K and densities from 10^5 - 10^10 cm^-3. Up to 20% of the initially free charges recombine in about 100 microseconds and the binding energy of the Rydberg atoms

Global and Local Optimization Algorithms for Optimal Signal Set Design

April 1, 2001
Author(s)
Anthony J. Kearsley
The problem of choosing an optimal signal set for non-Gaussian detection was reduced to a smooth inequality constrained mini-max nonlinear programming problem by Goeckenbach and Kearsley (SIAM J. Opt., 1998). Here we consider the application of several

Improvements in the NIST Cryogenic Thermal Transfer Standard

April 1, 2001
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Carl D. Reintsema
We describe the development of a cryogenic thermal transfer standard (CTTS) from the first prototype in 1997 to the present version. A description of the superconducting transition-edge sensor (TES) and the development of a superconducting input

In Order to Form a More Perfect UNION

April 1, 2001
Author(s)
Isabel M. Beichl, F Sullivan
In this computing prescription we present an algorithm for finding a minimum spanning tree figure 1 shows a typical application of this MST algorithm. Here we have 11 data points in a plane and would like to find some structure among them. Suppose we draw
Displaying 45551 - 45575 of 73697
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