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Displaying 34676 - 34700 of 73832

Magnetic field-induced spectroscopy of strongly forbidden optical transitions

March 3, 2006
Author(s)
Alexey Taychenachev, V Yudin, Christopher W. Oates, C Hoyt, Zeb Barber, Leo W. Hollberg
We propose a method that uses a static magnetic field to enable direct optical excitation of forbidden electric dipole transitions that are otherwise prohibitively weak. The method is based on mixing of atomic states by a static magnetic field. The method

Legal and Technical Requirements for Time and Frequency Metrology

March 2, 2006
Author(s)
Michael A. Lombardi
Who needs time and frequency? This paper answers that question by discussing the technologies and applications that rely on precise time and frequency, and exploring their legal and technical requirements for measurement uncertainty. The technologies and

MINEX Performance and Interoperability of the INCITS 378 Fingerprint Template

March 2, 2006
Author(s)
Patrick Grother, R. McCabe, Craig I. Watson, Michael D. Indovina, Wayne J. Salamon, Patricia A. Flanagan, Elham Tabassi, Elaine M. Newton, Charles L. Wilson
While the interchange of fingerprint image data provides the greatest interoperability between dissimilar fingerprint recognition systems, standards exist that specify the location and formatting of processed minutiae locations data, or templates. Minutiae

Analysis of Charpy impact verification data: 1993-2003

March 1, 2006
Author(s)
Jolene D. Splett, Christopher N. McCowan
Indirect verification tests, used to verify the performance of Charpy impact machines according to ASTM Standard E23, are evaluated by the National Institute of Standards and Technology (NIST) and the data from these tests are co1lected in a database. The

Assembly Model Representation from Conceptual to the Detailed Design

March 1, 2006
Author(s)
Sudarsan Rachuri, Y H. Han, Sebti Foufou, Shaw C. Feng, Utpal Roy, Fujun Wang, Ram D. Sriram, Kevin W. Lyons
The important issue of mechanical assemblies has been a subject of intense research over the past several years. Most electromechanical products are assemblies of several components, for various technical as well as economic reasons. This paper provides an

Broadband Permittivity Measurements of High Dielectric Constant Films

March 1, 2006
Author(s)
Jan Obrzut, Nozaki R. AnopchenkoA
Our investigation concerns measuring broadband dielectric permittivity and loss tangent of thin film high dielectric constant (high-k) dielectric materials at microwave frequencies. The measurements are made in an APC-7 coaxial configuration where the test

Cellular Response to Phase-Separated Blends of Tyrosine-Derived Polycarbonate

March 1, 2006
Author(s)
L A. Bailey, Matthew Becker, J S. Stephens, Nathan D. Gallant, Christine M. Mahoney, N Washburn, Aarti Rege, J Kohn, Eric J. Amis
Tyrosine-derived polycarbonates are extremely promising degradable materials for use in orthpedic applications and two-dimensional thin films consisting of homopolymer and discrete compositional blends of the ethyl (DTE) and octyl (DTO) ester polycarbonate

Collisions and Near-Collisions for Reduced-Round Tiger

March 1, 2006
Author(s)
John M. Kelsey, Stefan Lucks
We describe a collision-finding attack on 16 rounds of the Tiger hash function requiring the time for about 244 compression function invocations. This extends to a collision-finding attack on 17 rounds of the Tiger hash function in time of about 249

Crystal Structure of the Class IV Adenylyl Cyclase From Yersinia Pestis

March 1, 2006
Author(s)
N Smith, Sung Kim, Prasad T. Reddy, David T. Gallagher
ABSTRACT: The crystal structure of the class IV adenylyl cyclase from Yersinia pestis is reported at 1.9 resolution. The class IV fold is distinct from the previously described folds for class II and class III ACs. The dimeric Yp AC-IV folds into an

Elevator Controls

March 1, 2006
Author(s)
Richard W. Bukowski, R P. Fleming, Jeffrey Tubbs, Christopher Marrion, Jill Dirksen, Chris Duke, Debbie Prince, Lee F. Richardson, Dave Beste, Dottie Stanlaske
The development of firefighter elevators and special application egress elevators is reviewed. Recent activities of the elevator industry and NIST to develop standards and building code requirements for elevators for use by the fire service and by
Displaying 34676 - 34700 of 73832
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