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Search Publications

NIST Authors in Bold

Displaying 38226 - 38250 of 73697

The era of coherent optical frequency references

September 29, 2004
Author(s)
Leo W. Hollberg, Christopher W. Oates, Scott Diddams, G Wilpers, A Bartels, C Hoyt, Zeb Barber
The past four years have shown a dramatic improvement in the performance of optical frequency references and in the methods by which they are calibrated and utilized. These revolutionary changes result from better stabilized lasers that probe narrow

Wear and Mechanical Properties of Nano-Silica-Fused Whisker Composites

September 28, 2004
Author(s)
Hockin D. Xu, Janet Quinn, Anthony A. Giuseppetti
This study aimed to improve the composite wear resistance via reinforcement using nano-silica-fused whiskers, and to examine the relationships between wear and mechanical properties. Nano-silica particles were fused onto silicon nitride whiskers at 800 C

A Test Methodology for Multiple Sensor Multiple Criteria Alarms

September 26, 2004
Author(s)
Thomas G. Cleary
Multiple sensor-multiple criteria fire alarms hold promise for improving fire detection by both increasing sensitivity to fire while decreasing nuisance alarms. Eventually, to provide a fair assessment of performance, some type of uniform testing protocol

Retrieving Noisy Text

September 26, 2004
Author(s)
Ellen M. Voorhees, John S. Garofolo
Two tracks within TREC have examined the problem of retrieving noisy documents---documents whose content is not necessarily a faithful representation of the author's intent. The confusion track tested the ability of system to retrieve documents that were

Nonlinear Modeling of Tunnel Diode Detectors

September 24, 2004
Author(s)
Dave K. Walker, Kevin Coakley, Jolene Splett
We investigate the sensitivity and nonlinear properties of a tunnel diode microwave detector as functions of the input power and the load impedance presented at the detector's output. We compare the two-tone method estimate of nonlinearity with precise

Standard Radiometers and Targets for Microwave Remote Sensing

September 24, 2004
Author(s)
James P. Randa, Amanda Cox, Dave K. Walker, Michael H. Francis, Katherine MacReynolds, Jeffrey R. Guerrieri
We describe the NIST effort to develop brightness-temperature standards for microwave and millimeter-wave frequencies. Results of preliminary measurements at 26 GHz are presented.

Ensuring High Quality Data Transfer Standards

September 23, 2004
Author(s)
Arthur Griesser
Quality data transfer standards are necessary for effective communication between equipment provided by different vendors. Like other complex activities, standards benefit strongly from careful requirements definition and analysis. This presentation

Measuring the Performance of XML-Based Data Standards

September 23, 2004
Author(s)
Eric D. Simmon, Gino Crispieri
The semiconductor fabrication plant floor is a constantly changing environment. As equipment and fabrication process complexity increases, larger quantities of data are being generated, transferred and processed. New data encoding standards are being

Pose of I-Beams for Construction Site Automation

September 21, 2004
Author(s)
David E. Gilsinn, Geraldine S. Cheok, Alan M. Lytle
Automation of construction processes can result in reduced project costs and increased worker safety. A process that lends itself to automation is the picking and placing of objects. However, determining the pose (position and orientation) of an object is

Errors due to the reflectivity of calibration targets

September 20, 2004
Author(s)
James P. Randa, Dave K. Walker, Amanda Cox, Robert L. Billinger
For a microwave total-power radiometer, we consider the error introduced by neglecting the difference in the antenna reflection coefficient between when it views a distant scene and when it views a nearby calibration target. An approximate expression is

Refrigeration for Superconductors

September 20, 2004
Author(s)
Ray Radebaugh
Temperatures in the range of 0.05 to 80 K are required for most applications of superconductors. Refrigeration powers range from fractions of a watt for many electronic applications to kilowatts for some large magnet and power applications. This paper
Displaying 38226 - 38250 of 73697
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