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Displaying 48251 - 48275 of 73829

An Introduction to Evaluating Biometric Systems

February 1, 2000
Author(s)
P J. Phillips, Alvin F. Martin, Charles L. Wilson, Mark A. Przybocki
How and where biometric systems are deployed will depend on their performance. Knowing what to ask and how to decipher the answers can help you evaluate the performance of these emerging technologies. On the basis of media hype alone, you might conclude

An Ultracold Neutral Plasma Created by Photoionizing Laser-Cooled Xenon

February 1, 2000
Author(s)
T C. Killian, S Kulin, S L. Rolston
We create an ultracold neutral plasma by photoionization of laser-cooled xenon atoms. The charge carrier density is as high as 2 x10^{9} cm^{-3}, and the temperatures of electrons and ions are as low as 100 mK and 10 uK, respectively. Such low temperatures

Atomic Force Microscopy of Hybrid Bilayer Membranes

February 1, 2000
Author(s)
John T. Woodward IV
Hybrid bilayer membranes (HBM) are synthetic membrane mimics designed to form a biomimetic surface. The basic HBM system consists of a lipid monolayer adsorbed to an alkanethiol self-assembled monolayer. More advanced versionshave used different thiolates

Atomic Weights and Isotopic Compositions (Version 2.0)

February 1, 2000
Author(s)
J S. Coursey, Robert A. Dragoset
The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate. The atomic weights data were published by T. B. Coplen in Atomic Weights of the Elements 1995, and the isotopic compositions

Capillary X-Ray Microfluorescence Instrument

February 1, 2000
Author(s)
J R. Swider
Although many techniques for microanalysis exist, few are totally nondestructive, easy to maintain, or portable. Techniques such as Electron Probe Microanalysis (EPMA) deliver sub-micrometer beams, but are destructive in sample preparation and in analysis

Ceramic Coatings Metrology Workshop Report

February 1, 2000
Author(s)
S J. Dapkunas
The Ceramic Coatings Metrology Workshop was held at NIST to identify the measurement needs of the various industries that manufacture and use ceramic coatings. The industrial perspectives were complemented by reviews of the scientific issues that require

Chemical Science and Technology Laboratory 1999 Technical Activities Report

February 1, 2000
Author(s)
Hratch G. Semerjian, W Koch
This report summarizes the research and services provided by the Chemical Science and Technology Laboratory of the National Institute of Standards and Technology for Fiscal Year 1999. The report includes: a general overview of the laboratory's activities

Compressible Fluid Dynamics in Materials Processing

February 1, 2000
Author(s)
Steven P. Mates
Two widely-utilized materials processing techniques, namely liquid metal atomization and thermal spraying, heavily involve compressible fluid dynamics. In liquid metal atomization, a hot melt stream is disintegrated by a cold supersonic gas jet into small

Crystallization and 1.1 Angstrom Diffraction of Chorismate Lyase From Escherichia Coli

February 1, 2000
Author(s)
C Stover, M P. Mayhew, Marcia J. Holden, A Howard, David Travis Gallagher
Clorismate pathway enzymes are important as producers of nonnucleotide aromatic compounds. The enzyme chorismate layase from Escherichia coli has been crystallized in four distinct forms, three of which have been characterized by x-ray diffraction. Despite
Displaying 48251 - 48275 of 73829
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