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Displaying 46201 - 46225 of 74337

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

Interferometric measurement of refractive-index change in photosensitive glass

April 1, 2001
Author(s)
Tasshi Dennis, E. M. Gill, Sarah L. Gilbert
We report on a technique for determining the change in the refractive index of photosensitive glass. We have demonstrated our interferometer-based technique on fiber preform and bulk glass samples, achieving an optical: path-difference (OPD) repeatability

International Standards for Design Life of Constructed Assets

April 1, 2001
Author(s)
C Sjostrom, P Jernberg, G J. Frohnsdorff
In 1993, a working group aimed at developing standards for design life was established in ISO Technical Committee TC59, Building Construction. The working group was later elevated to subcommittee status as ISO/TC59/SC14 - Design Life. The purpose of the

Java and Numerical Computing

April 1, 2001
Author(s)
Ronald F. Boisvert, J Moreira, M Philippsen, Roldan Pozo
We discuss the advantages and disadvantages of using Java for numerical computing. We provide examples of current performance levels and propose several additional language features that would make Java more easily applied in scientific applications.

Low Thermal Conductivity Vapor Deposited Zirconia Microstructures

April 1, 2001
Author(s)
D D. Hass, Andrew Slifka, H N. Wadley
Low thermal conductivity yttria stabilized zirconia (YSZ) coatings have been grown using a low vacuum (0.20 Torr) electron beam directed vapor deposition process. In this approach, a transsonic helium jet was used to entrain and transport an evaporated YSZ

Magnetic Switch for Integrated Atom Optics

April 1, 2001
Author(s)
D Mueller, Eric A. Cornell, M Prevedelli, P Schwindt, Y J. Wang, D Z. Anderson
A magnetic waveguide structure allows switching of neutral atoms between two guides. The switch consists of lithographically patterned current-carry-carrying wires on a sapphire substrate. By selectively sending current through a particular set of wires

Making MALDI-TOF-MS an Absolute Method for Determination of the MMD of Polymers

April 1, 2001
Author(s)
Charles M. Guttman, William R. Blair, S Wetzel
In 1963, Donald McIntyre of the NBS Polymers Division produced the first polymer molecular mass standards to be issued by NBS as Standard Reference Materials (SRM), SRM 705. The appearance of this SRM marked the beginning of a long and continuing tradition

Mass Spectrometry of Spin-On-Glass Low-K Dielectric Precursors

April 1, 2001
Author(s)
William E. Wallace, Kathleen M. Flynn, Joseph M. Antonucci
The degree-of-intramolecular-condensation, defined as the number of residual silanol (SiOH) groups per oligomer, for a variety of silsesquioxane polymers was measured by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Reaction

NIST Research on Structural Performance of Housing Systems

April 1, 2001
Author(s)
Fahim Sadek, Michael A. Riley
An outline of NIST research in the area of structural performance of housing systems is presented in this paper. The performance of wood-frame houses in past earthquakes and hur-ricanes is summarized, and the state-of-the-art in experimental and analytical
Displaying 46201 - 46225 of 74337
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