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Displaying 41926 - 41950 of 74335

Spotlight - Biometric Authentication -- Are You Who You Claim To Be?

March 1, 2003
Author(s)
Michael D. Hogan
The recent establishment of the International Organization for Standardization/International Electrotechnical Commission Joint Technical Committee 1/Subcomittee 37 (ISO/IEC JTC 1/SC 37) on Biometrics is a major development in international standardization

Structure and Dimensions of PAMAM/PEG Dendrimer-Star Polymers

March 1, 2003
Author(s)
R C. Hedden, Barry J. Bauer
Dendrimer-star polymers are prepared by grafting monofunctional poly(ethylene glycol) (PEG) chains of low polydispersity onto the terminal groups of poly(amidoamine) (PAMAM) dendrimers. A novel gel permeation chromatography technique is used to calculate

Structure and Properties of Consolidated Amorphous Metal Powder

March 1, 2003
Author(s)
Frank S. Biancaniello, Tony Zahrah, Rodney D. Jiggetts, L J. Rowland, Steven P. Mates, Stephen D. Ridder, S Glasmachers
Amorphous metal alloys have been developed with sufficiently slow crystallization kinetics to allow the casting of bulk metallic glass (BMG) components up to several centimeters in cross section. Mechanical characterization of these castings has shown that

Structure and Vibrational Dynamics of the Halogen-Substituted Butynes HC Equivalent to CCH 2 CH 2 X (X=F,Cl,Br) from Molecular-Beam High-Resolution Microwave and Infrared Spectroscopy

March 1, 2003
Author(s)
J C. Keske, F S. Rees, R D. Suenram, Brooks H. Pate
The pure rotational and high-resolution acetylenic C-H stretch rovibrational spectra of a series of substituted butynes, HC=CCH 2CH 2X (X=F,Cl,Br), are reported. For each of the molecules the pure rotational spectrum of two conformational isomers (trans

Thermal Evaluation of Scorched Graphite-Epoxy Panels by Infrared Scanning

March 1, 2003
Author(s)
Andrew J. Slifka, T Hall, E S. Boltz
A simple measurement system is described for evaluating damage to graphite-dpoxy panels, such as are used in high-performance aircraft. The system uses a heating laser and infrared imaging system to measure thermal performance. thermal conductivity or

Thermodynamics of Enzyme-Catalyzed Reactions

March 1, 2003
Author(s)
Robert N. Goldberg, Yadu D. Tewari
This review, which has been prepared for the McGraw-Hill 2003 Yearbook of Science and Technology, gives an overview of the thermodynamics of enzyme-catalyzed reactions. Topics include the thermodynamic formalism(s) used in this field, computational methods

Uncertainty Budgets For Realisation of Scales By Radiation Thermometry

March 1, 2003
Author(s)
J Fischer, M Battuello, M Sadli, M Ballico, S N. Park, P Saunders, Y Zundong, B. Carol Johnson, E Van der Ham, W Li, F Sakuma, Graham Machin, N Fox, S Ugur, M Matveyev
Some recent international comparisons and the preliminary results of the key comparison CCT-K5 evidenced that the realisation of theITS-90 above the freezing point of silver and its dissemination with tungsten strip lamps may be less straightforward than

What Is the Best Transfer Standard for Gas Flow?

March 1, 2003
Author(s)
John D. Wright
National metrology institutes around the world have embarked on an effort to compare their primary gas flow standards under the supervision of the Comit International des Poids et Mesures and its Working Group on Fluid Flow. As the pilot laboratory for the

Ignition of Weathered and Emulsified Oils (NIST SP 995)

February 28, 2003
Author(s)
Anthony Putorti, D D. Evans, E J. Tennyson
In situ burning of oil spills has been shown to be a rapid means of removing oil from the water surface. Although fresh oil is usually easily ignited, the ability to ignite weathered oils and water-in-oil emulsions is less certain. This paper presents

Nanoscale Chemical Imaging of Polymeric Materials With Atomic Force Microscopy

February 26, 2003
Author(s)
Xiaohong Gu, Tinh Nguyen, Michael J. Fasolka, D Julthongpiput, Lei Chen, Mark R. VanLandingham, Y C. Jean, Jonathan W. Martin
Nanoscale spatial chemical information is essential to developing a molecular-level understanding of a variety of phenomena occurring at surfaces and interfaces, including adhesion, friction, and surface reactivity. Therefore, the ability to probe and

Secure Interconnections for Information Technology Systems

February 26, 2003
Author(s)
Shirley M. Radack
This bulletin summarizes NIST Special Publication 800-47, Security Guide for Interconnecting Information Technology Systems, which provides guidance for planning, establishing, maintaining, and terminating secure yet cost-effective interconnections between

Canonical Decompositions of n-qubit Quantum Computations and Concurrence

February 25, 2003
Author(s)
Stephen Bullock, G K. Brennen
The two-qubit canonical decomposition SU(4) = [SU(2) SU(2)]?[SU(2) SU(2)] writes any two-qubit quantum computation as a composition of a local unitary, a relative phasing of Bell states, and a second local unitary. Using Lie theory, we generalize this to
Displaying 41926 - 41950 of 74335
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