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NIST Authors in Bold

Displaying 40951 - 40975 of 73969

Studies of Fingerprint Matching Using the NIST Verification Test Bed (VTB)

July 1, 2003
Author(s)
Charles L. Wilson, Craig I. Watson, Michael D. Garris, R. A. Hicklin
A series of fingerprint matching studies have been conducted on an experimental laboratory system called the Verification Test Bed (VTB). The VTB is a collection of commercial off the shelf (COTS) computer hardware, an open-source operating system, and a

Terahertz Spectroscopy of Short-Chain Polypeptides

July 1, 2003
Author(s)
M R. Kutteruf, Craig Brown, L K. Iwaki, M B. Campbell, Timothy M. Korter, Edwin J. Heilweil
Terahertz (THz) absorption and neutron vibrational spectra for solid-phase short-chain peptide sequences at 77 K and 298 K are reported. We demonstrate that a high degree of spectral and structural information exists for these systems in the 1 THz to 15

The Detection and Sizing of Flaws in Components From the Hot-End of Gas Turbines Using Phase Contrast Radiography: A Feasibility Study

July 1, 2003
Author(s)
J Thornton, P J. McMahon, B E. Allman, J E. Murphy, K A. Nugent, David L. Jacobson, Muhammad D. Arif, S. A. Werner
In this paper we present a feasibility study of the use of phase contrast radiography in the examination of components from the hot-section of gas turbine engines. These components are usually made from dense materials (nickel or cobalt based superalloys)

The Expanding NIST Atomic Spectra Database

July 1, 2003
Author(s)
Wolfgang L. Wiese
The NIST Atomic Spectra Database is reviewed, and the additions planned for the near-term and longer range future are discussed. Two examples are presented, illustrating the often still unsatisfactory state of transition probability data, which show the

Theory of the Greenspan Viscometer

July 1, 2003
Author(s)
Keith A. Gillis, J B. Mehl, Michael R. Moldover
We present a detailed acoustic model of the Greenspan acoustic viscometer, a practical instrument for accurately measuring the viscosity eta of gases. As conceived by Greenspan, the viscometer is a Helmholtz resonator composed of two chambers coupled by a

Toward Traceability for At-line AFM Dimensional Metrology

July 1, 2003
Author(s)
Marylyn H. Bennett, Angela Guerry, Ronald G. Dixson, Michael T. Postek, Theodore V. Vorburger
The in-line and at-line measurement tools for critical dimension (CD) metrology in semiconductor manufacturing are technologically advanced instruments that exhibit excellent measurement repeatability - below one nanometer in some cases. Accuracy, however

Towards High Accuracy Reflectometry for Extreme-Ultraviolet Lithography

July 1, 2003
Author(s)
Charles S. Tarrio, S Grantham, M B. Squires, Robert E. Vest, Thomas B. Lucatorto
Currently the most demanding application of extreme ultraviolet optics is connected with the development of extreme ultraviolet lithography. Not only does each of the Mo/Si multilayer EUV stepper mirrors require the highest attainable reflectivity at 13 nm

Two-Color Photoassociation Spectroscopy of the Lowest Triplet Potential of Na 2

July 1, 2003
Author(s)
L E. de Araujo, J D. Weinstein, S D. Gensemer, F K. Fatemi, Kevin Jones, Paul D. Lett, Eite Tiesinga
We have performed a type of Autler-Townes spectroscopy to locate a number of rovibrational hyperfine levels of the a ^3^ς + u potential, the lowest triplet potential of the Na 2 dimer. The spectroscopy starts with the photoassociation of ultracold atoms in

UML 2 Activity and Action Models

July 1, 2003
Author(s)
Conrad E. Bock
This is the first in a series introducing the activity model in the Unified Modeling Language, version 2 (UML 2), and how it integrates with the action model [1]. The series is a companion to the standard, providing additional background, rationale

Virtual Environment for Manipulating Microscopic Particles with Optical Tweezer

July 1, 2003
Author(s)
Thomas W. LeBrun, Kevin W. Lyons, Yong-Gu Lee
In this paper, we use virtual reality techniques to define an intuitive interface to a nanoscale manipulation device. This device utilizes optical methods to focus laser light to trap and reposition nano-to-microscopic particles. The underlying physics are

Data Evaluation Theory and Practice for Materials Properties

June 26, 2003
Author(s)
R G. Munro
Data evaluation is the process by which collections of data are assessed with respect to reliability, completeness, and consistency. The present work addresses data evaluation for materials properties as a scientific discipline that evolves from the formal

Magneto-optic effects in spin-injection devices

June 23, 2003
Author(s)
Steve Ruggiero, Anthony Williams, Carol Tanner, S. Potashnik, John M. Moreland, William Rippard
The magneto-optic properties of semi-transparent ferromagnetic films are presented in the context of ferromagnet/GaAs spin-injection devices. We have measured the polarization-dependent photoresponse and magneto-optic properties of Co/i}n-GaAs, Co/p-GaAs
Displaying 40951 - 40975 of 73969
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