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Search Publications

NIST Authors in Bold

Displaying 44776 - 44800 of 73697

Separation of Scales for Growth of an Alloy Needle Crystal

October 1, 2001
Author(s)
R F. Sekerka, Sam R. Coriell, Geoffrey B. McFadden
We reexamine the problem of a needle crystal (a model for a dendrite primary stalk) having the shape of a paraboloid of revolution growing at constant velocity from a supercooled binary alloy with given bulk concentration and far-field temperature. The

Single Pulse Shock Tube

October 1, 2001
Author(s)
Wing Tsang, A. Lifshitz
This chapter is concerned with the use of the single pulse shock tube for studying the mechanisms and rate constants for the decomposition of polyatomic molecules at elevated temperatures. It begins with a discussion of the technique. The requirements and

Some Developments at NIST on Traceability in Dimensional Measurements

October 1, 2001
Author(s)
Dennis A. Swyt, Steven D. Phillips, J Palmateer
This paper reports to the international community on recent developments in technical ;policies, programs, and capabilities at the U.S. National Institute of Standards and Technology (NIST) related to traceability in dimensional measurements. These

Standards for Reliability Testing of Heavy Vehicle

October 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitrides offer unique

Statistical Process Monitoring for Autocorrelated Data

October 1, 2001
Author(s)
Nien F. Zhang
In the past years statistical process methodologies have been widely used in industry for process monitoring. However, the assumption that the process data are statistically independent is often invalid. This article discusses the approaches to deal with

Structural Control of Elastic Constants of Mullite in Comparison to Sillimanite

October 1, 2001
Author(s)
B Hildmann, H M. Ledbetter, Sung Kim, H A. Schneider
The nine elastic stiffness coefficients C, of a mulitte single crystal (2Al 2O 3.SiO 2) were measured using Acoustic Resonance Spectroscopy (ARS). The obtained values are similar to those of the structurally related alumino-silicate phase sillimanite (Al

Structure and Electronic Transport Properties of Si-(B)-C-N Ceramics

October 1, 2001
Author(s)
A M. Hermann, Y T. Wang, P A. Ramakrishnan, Davor Balzar, L A. An, C Haluschka, R Riedel
The structure and electronic transport properties of polymer-derived pristine-and boron-doped silicon-carbonitride ceramics have been studied, with particular emphasis on understanding the effect of annealing treatments. Structural analysis using the

Techniques to Improve Bluetooth Performance in Interference Environments

October 1, 2001
Author(s)
Nada T. Golmie, Nicolas Chevrollier
Bluetooth is a radio technology for Wireless Personal Area Networks operating in the 2.4 GHz ISM band. Since both Bluetooth and IEEE 802.11 devices use the same frequency band and may likely come together in a laptop or may be close together at a desktop

Temperature Measurement and Control in Microfluidic Systems

October 1, 2001
Author(s)
David J. Ross, Michael Gaitan, Laurie E. Locascio
We describe a technique for the measurement of fluid temperatures in microfluidic systems based on temperature-dependent fluorescence. The technique is easy to implement with a standard fluorescence microscope and CCD camera. The efficiency of the method

Test-Chamber Imaging Using Spherical Near-Field Scanning

October 1, 2001
Author(s)
Ronald C. Wittmann, Michael H. Francis
Although the theory is straightforward, practical implementation of spherical near-field scanning for evaluating test chambers presents some significant challenges. Among these are the requirement for accurate probe positioning and the difficulty in

The Ninth Text REtrieval Conference (TREC-9)

October 1, 2001
Author(s)
Ellen M. Voorhees, Donna K. Harman
This paper provides an overview of the ninth Text REtrieval Conference (TREC-9) held in Gaithersburg, Maryland, November 13-16, 2000. TREC-9 is the latest in a series of workshops designed to foster research in text retrieval. This year's conference

Time- and Frequency-Domain Analysis of EMC Test Facilities

October 1, 2001
Author(s)
David R. Novotny, Robert T. Johnk, Claude Weil, Seturnino Canales
We have developed a methodology to determine the quality of an EMC test facility using equipment that may be generally available to RF testing services. By utilizing both, the time- and frequency-domains, an accurate picture of the scattering , and modal

Time-Resolved Isothermal Crystallization of Absorbable PGA-co-PLA Copolymer by Synchrotron Small-Angle X-Ray Scattering and Wide-Angle X-Ray Diffraction

October 1, 2001
Author(s)
Z G. Wang, X H. Wang, B S. Hsiao, S Andjelic, D Jamiolkowski, J McDivitt, J Fischer, J Zhou, Charles C. Han
The isothermal crystallization behavior of absorbable dyed and undyed PGA-co-PLA copolymers was investigated by time-resolved simultaneous synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) methods. The morphological

Tomography of Integrated Circuit Interconnects

October 1, 2001
Author(s)
Zachary H. Levine, A R. Kalukin, M Kuhn, S P. Frigo, I McNulty, C C. Retsch, Y Wang, Uwe Arp, Thomas B. Lucatorto, Bruce D. Ravel, Charles S. Tarrio
00 Word summary based on the paper:Z. H. Levine, A. R. Kalukin, M. Kuhn, S. P. Frigo, I. McNulty,>C. C. Retsch, Y. Wang, U. Arp, T. B. Lucatorto, B. D. Ravel, and C. Tarrio,>``Microtomography of Integrated Circuit Interconnect with an> Electromigration

Ultracold Collisions of Metastable Helium Atoms

October 1, 2001
Author(s)
P J. Leo, V Venturi, I B. Whittingham, J F. Babb
We report scattering lengths for the 1ς + g, 3ς + u, 5ς + g adiabatic molecular potentials relevant to collisions of two metastable 2 3S helium atoms as a function of the uncertainty in these potentials. These scattering lengths are used to calculate
Displaying 44776 - 44800 of 73697
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