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Displaying 41676 - 41700 of 74090

Self-Adaptive Leasing for Jini

March 1, 2003
Author(s)
K Bowers, Kevin L. Mills, Scott W. Rose
Distributed computing environments require strategies by which components can detect and recover from failures in remote, collaborating components. Many protocols for distributed systems employ a strategy based on leases, which grant a leaseholder with

Sharing a Common Sense of Time

March 1, 2003
Author(s)
J C. Eidson, Kang B. Lee
Distributed measurement and control systems in which all components share a common sense of time allow significant decoupling of synchronization issues from considerations of communication latency and fluctuation. This decoupling enables new techniques for

Shear-Induced Structure in Polymer Blends With Viscoelastic Asymmetry

March 1, 2003
Author(s)
Erik K. Hobbie, H Jeon, Haonan Wang, H W. Kim, D J. Stout, Charles C. Han
Light scattering and optical microscopy have been used to measure the morphology as a function of shear rate and composition in polymer blends with viscoelastic asymmetry in the melt components. The blends studied are immiscible mixtures of low-vinyl

Small-Angle Neutron Scattering Study of the Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed Yttria-Stabilized Zirconia Deposits

March 1, 2003
Author(s)
H Boukari, Andrew J. Allen, Gabrielle G. Long, J Ilavsky, Jay S. Wallace, C C. Berndt, H Herman
The microstructures of thick plasma-sprayed yttria-stabilized (8% mass) zirconia deposits have been studied in a series of Porod small-angle neutron scattering (SANS) and multiple small-angle neutron scattering (MSANS) experiments. Three main void

Smoke Measurements Using a Helicopter Transported Sampling Package (NIST SP 995)

March 1, 2003
Author(s)
William D. Walton, Jay A. McElroy, W H. Twilley, R. R. Hiltabrand
A first generation smoke sampling package designed to be deployed on a helicopter winch cable has been developed. The package contains three sampling pumps which are operated via radio control from the helicopter. The pumps can be fitted with a variety of

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
Displaying 41676 - 41700 of 74090
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