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Displaying 44901 - 44925 of 73929

VAMAS: Accomplishments and Future Directions

November 1, 2001
Author(s)
Stephen W. Freiman, E A. Early
The Versailles Project on Advanced Materials and Standards (VAMAS) was created in 1982 to support trade through international collaboration in pre-standards research in advanced materials. VAMAS has become self-sustaining through Memoranda of Understanding

W3C Quality Assurance Activity Initiated

November 1, 2001
Author(s)
Lynne S. Rosenthal
In order for web specifications to permit full interoperability and access to all, it is important that the quality of implementation be given as much attention as their development. Moreover, as the complexity of W3C specifications and their

Wireless Interfaces for IEEE 1451 Sensors Network

November 1, 2001
Author(s)
James D. Gilsinn, Kang B. Lee
NIST started working with industry and the Institute of Electrical Engineers (IEEE) in the mid 90''s to develop a standardized interface to network smart sensors. With the spread of wireless technology, more industries are looking to incorporate wireless

X-Ray Spectra in the 12- to 60- keV Energy Range From Plasmas Produced by the OMEGA Laser

November 1, 2001
Author(s)
J Seely, R Deslattes, Lawrence T. Hudson, G Holland, R Atkin, D D. Meyerhofer, C Stoeckl
X-ray spectra in the energy range (12 to 60) keV were recorded by a transmission crystal spectrometer from targets irradiated by the 60 beam, difference} 30 kJ, OMEGA laser. The targets consisted of planar silver and goldfoils, spherical gold targets, and

X-Ray Tomography of Integrated Circuit Interconnects: Past and Future

November 1, 2001
Author(s)
Zachary H. Levine
An Al-W-silica integrated circuit interconnect sample was thinned to several micro υ and scanned across a 200 nm focal spot of a Fresnel zone plate operating at photon energy of 1573 eV. The experiment was performed on beamline 2-ID-B of the Advanced

Real-Time Operating System Timing Jitter and its Impact on Motor Control

October 29, 2001
Author(s)
Frederick M. Proctor, William P. Shackleford
General-purpose microprocessors are increasingly being used for control applications due to their widespread availability and software support for non-control functions like networking and operator interfaces. Two classes of real-time operating systems

Real-Time Operating System Timing Jitter and its Impact on Motor Control

October 29, 2001
Author(s)
Frederick M. Proctor, William P. Shackleford
General-purpose microprocessors are increasingly being used for control applications due to their widespread availability and software support for non-control functions like networking and operator interfaces. Two classes of real-time operating systems

The TREC Question Answering Track

October 29, 2001
Author(s)
Ellen M. Voorhees
The Text REtrieval Conference (TREC) question answering track is an effort to bring the benefits of large-scale evaluation to bear on a question answering (QA) task. The track has run twice so far, first in TREC-8 and again in TREC-9. In each case the goal

Chapter 19 Shock and Vibration Standards

October 22, 2001
Author(s)
Christopher J. Evans, H C. Pusey
Chapter 19 is concerned with shock and vibration standards covering: terminology; use and calibration of transducers and instrumentation; shock and vibration generators; structures and structural systems; vehicles including land-based, airborne, and ocean

Crossover From First-Order to Critical Wetting: Short-Range Tricritical Wetting

October 22, 2001
Author(s)
David J. Ross, D Bonn, A I. Posazhennikova, J O. Indekeu, J Meunier
We study wetting in liquid mixtures of methanol and the n-alkanes. Mixing alkanes of different chain lengths, we can examine the crossover between critical (continuous) and first-order (discontinuous) wetting transitions. Measurements of the film thickness

Time-Domain Measurement System to Characterize Ultrawideband Emissions

October 21, 2001
Author(s)
Robert T. Johnk, David R. Novotny
This paper summarizes some results of a recent NIST measurement effort. The purpose of this effort was to use a NSIT-developed ultrawideband measurement system to assess the time and frequency-domain characteristics of selected ultrawideband transmitting

Intron and Exons

October 17, 2001
Author(s)
Arlin B. Stoltzfus
An intron (or intervening sequence) is a segment of RNA excised from a gene transcript, with concomitant ligation of flanking segments called exons. Introns of some type are found in every kingdom of cellular life, and also in viruses, bacteriophages and
Displaying 44901 - 44925 of 73929
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