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Search Publications

NIST Authors in Bold

Displaying 42576 - 42600 of 73697

Smart and Designer Structural Material Systems

October 1, 2002
Author(s)
K P. Chong, Edward Garboczi
An efficient civil infrastructure system is essential to every country's productivity and quality of life. Basic research and development in smart structures and designer materials has shown great potential for enhancing the functionality, serviceability

Structural Study of an Unusual Cubic Pyrochlore Bi 1.5 Zn o.92 Nb 1.5 O 6.92

October 1, 2002
Author(s)
Igor Levin, T G. Amos, J Nino, Terrell A. Vanderah, C A. Randall, M T. Lanagan
Single-phase pyrochlore specimens of Bi 1.5Zn 0.92Nb 1.5O 6.92 were studied using combined electron, X-ray and neutron powder diffraction techniques. Rietveld refinements using neutron powder diffraction data confirmed an average pyrochlore structure A 2B

Superconformal Film Growth

October 1, 2002
Author(s)
Thomas P. Moffat, Daniel Wheeler, Daniel Josell
Superconformal electrodeposition of copper is explained by the recently developed curvature enhanced accelerator coverage (CEAC) mechanism. The model stipulates that 1. the growth velocity is proportional to the local accelerator, or catalyst, surface

Synthesis and Characterization of Colloidal Beta-HgS Quantum Dots

October 1, 2002
Author(s)
K A. Higginson, M Kuno, John E. Bonevich, S B. Qadri, M Yousuf, H Mattoussi
High-quality colloidal mercury sulfide quantum dots (QDs) are synthesized at room temperature using a synthetic strategy combining the effects of strongly binding Hg(II) ligands with a two-phase metal/chalcogen precursor compartmentalization scheme. This

Testing STEP-NC Implementations

October 1, 2002
Author(s)
Allison Barnard Feeney, Simon P. Frechette
STEP (STandard for the Exchange of Product model data, ISO 10303) data for numerical control, or STEP-NC, is intended to provide full product and process data interoperability between computer-aided manufacturing systems and machine tool controllers

The Development and Evolution of TREC and DUC

October 1, 2002
Author(s)
Donna K. Harman
The Text REtrieval Conference (TREC) has been running for 11 years now, with 93 participants in the last round of evaluation. This paper chronicles the changes in TREC over that time, emphasizing the evolution in the tasks that were evaluated rather than

The Environmental Life Cycle

October 1, 2002
Author(s)
Barbara C. Lippiatt
ES (Building for Environmental and Economic Sustainability) implements a rational, systematic technique for selecting environmentally and economically balanced building products. The technique is based on consensus standards and designed to be practical

The Existence of Precursor Soot in the Exhaust of Inverse Diffusion Flames

October 1, 2002
Author(s)
L G. Blevins, Robert A. Fletcher, Bruce A. Benner Jr, Eric B. Steel, George W. Mulholland
Knowledge of the chemical and physical structure of precursor soot is useful in the development of soot particle inception models. This paper examines the hypothesis that soot exiting an inverse flame is similar in chemical and morphological structure to

The Moisture Content of the Air in Equilibrium with Certain Desiccants

October 1, 2002
Author(s)
Peter H. Huang
The water vapor content of the air in equilibrium with various chemical desiccants at 28 C 1 C has been determined by using an advanced micro-sensor and measuring its electrical capacitance at a frequency of 20 kHz. The microsensor was calibrated against

The NIST Data Gateway: Providing Easy Access to NIST Data Resources

October 1, 2002
Author(s)
D M. Blakeslee, Angela Y. Lee, A J. Belsky
The National Institute of Standards and Technology (NIST) maintains a wide range of scientific and technical data resources, including free online data systems and PC databases available for purchase. However, many people are not familiar with these

The NIST Low Temperature ITS-90 Realization and Calibration Facilities

October 1, 2002
Author(s)
Christopher W. Meyer, Weston L. Tew
Two facilities have been constructed at NIST for realizing and maintaining the ITS-90 below 84 K. The first facility is an integrated low temperature realization system that realizes the ITS-90 below 84 K in its entirety and which we refer to as the Low

Thermal Modeling of Multiple-Line-Heat-Source Guarded Hot Plate Apparatus

October 1, 2002
Author(s)
William M. Healy, D R. Flynn
The National Institute of Standards and Technology is building an advanced-design guarded hot plate apparatus of advanced design to provide very accurate thermal transmission properties for specimens of thermal insulation 500 mm in diameter, with

Ultrafast Photodissociation of Br 2 : Laser-Generated High-Harmonic Soft X-Ray Probing of the Transient Photoelectron Spectra and Ionization Cross Sections

October 1, 2002
Author(s)
L Nugent-Glandorf, M Scheer, D A. Samuels, V M. Bierbaum, S R. Leone
The ultrafast dissociation of gas-phase Br 2 is probed via a 400 nm-pump soft-x-ray probe scheme at five different high-order harmonicwavelengths (13th, 15th, 17th, 19th, and 21st of an 800 mn Ti:sapphire laser). A series of time-resolved ultrafast

Using HMMs to Quantify Signals from DNA Driven Through a Nanometer Scale Pore

October 1, 2002
Author(s)
Vincent M. Stanford, John J. Kasianowicz
It was recently shown that individual molecules of single-stranded DNA can be forced through a nanoscale pore by an electric field. We demonstrate signal processing methods to detect and measure sub-states in the DNA-induced current blockades during

Three Dimensional Data Capture in Indoor Environments for Autonomous Navigation

September 30, 2002
Author(s)
John Evans, Tommy Chang, Tsai Hong Hong, Roger V. Bostelman, Robert Bunch
An innovative use of a low-cost laser range scanner captures three dimensional features of indoor environments in a manner suitable for mobile robot navigation that is superior to earlier approaches. This three dimensional mapping solves many of the known

A Tool to Improve Efficiency in Large Scale Manufacturing

September 25, 2002
Author(s)
Roger V. Bostelman, William P. Shackleford, Frederick M. Proctor, James S. Albus, Alan M. Lytle
NIST is working directly with industry to improve repair and conversion operations of ships in dry dock. Similarly, this work allows transfer of technology to construction and other industries requiring worker-access to large, external surfaces with

Advancements in Tele-Robotic Pipelaying

September 23, 2002
Author(s)
L E. Bernold, B Li
The labor intensive construction industry has a very high accident rate. One of the key reasons for this is the exposure of workers to a hazardous environment such as heights, confined narrow spaces, and exposure to health threatening fumes, dust, and
Displaying 42576 - 42600 of 73697
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