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Search Publications

NIST Authors in Bold

Displaying 33701 - 33725 of 73697

Comparative Measures of Single Wall Carbon Nanotube Dispersion

September 14, 2006
Author(s)
Jeffrey A. Fagan, Brian Landi, Idan Mandelbaum, Vardhan Bajpai, Barry J. Bauer, Kalman D. Migler, Jeffrey R. Simpson, Angela R. Hight Walker, Ryan Raffaelle, Erik K. Hobbie
Model polymer composites of DNA wrapped single-wall carbon nanotubes (SWNTs) dispersed in polyacrylic acid are used for a systematic comparison of the different metrologies currently used to evaluate SWNT dispersion. Application of a pH-controlled

Long-distance quantum key distribution in optical fibre

September 14, 2006
Author(s)
Philip A. Hiskett, Danna Rosenberg, Charles G. Peterson, Richard J. Hughes, Jane E. Nordholt, Sae Woo Nam, Adriana Lita, Aaron J. Miller
Use of low-noise detectors can both increase the secret bit rate of long-distance quantum key distribution (QKD) and dramatically extend the length of a fibre optic link over which secure keys can be distributed. Previous work has demonstrated the use of

The Microwave Spectrum of a Two-Top Peptide Mimetic: The N-Acetyl Alanine Methyl Ester Molecule

September 14, 2006
Author(s)
I Kleiner, J Demaison, David F. Plusquellic, R D. Suenram, R J. Lavrich, Francis J. Lovas, Gerald T. Fraser, Vadim V. Ilyushin
Rotational spectra of the ground torsional state of the N-acetyl alanine methyl ester molecule, a derivative of the alanine dipeptide biomimetic molecule, have been measured using a mini Fourier transform spectrometer between 10 and 20 GHz as part of a

Concrete Rheology: Knowledge and Challenges?

September 13, 2006
Author(s)
Chiara F. Ferraris
The design of concrete with specified properties for an application is not a new science, but it has taken on a new meaning with the wide use of special concretes, such as self compacting concrete (SCC). General terms such as flow under its own weight and

Curing, Hydration, and Microstructure of Cement Paste

September 13, 2006
Author(s)
Dale P. Bentz, Paul E. Stutzman
This paper compares the hydration characteristics and microstructures of cement pastes with water-to-cement ratios (w/c) of 0.35 and 0.435, cured under saturated and sealed conditions. Degree of hydration is quantified by loss on ignition measurements. The

Guide to Computer Security Log Management

September 13, 2006
Author(s)
Karen A. Scarfone, Murugiah Souppaya
The National Institute of Standards and Technology (NIST) developed this document in furtherance of its statutory responsibilities under the Federal Information security Management Act (FISMA) of 2002, Public Law 107-347. This publication seeks to assist

Phase Formation and Properties in the System Bi2O 3:2CoO 1+x:Nb2O5

September 13, 2006
Author(s)
Terrell A. Vanderah, T Siegrist, M W. Lufaso, C Yeager, Juan C. Nino, S Yates, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Co-Nb-O system in air (750 C to 925 C). Ternary compound formation was limited to pyrochlore (A2B 2O 6O ), which formed a substantial solid solution region at Bi-deficient stoichiometries (relative

Uncertainty Analysis for Virtual Cement Measurement

September 13, 2006
Author(s)
Blaza Toman, Adriana Hornikova, Robert C. Hagwood, Hung-Kung Liu, Nien F. Zhang, Edward J. Garboczi, Jeffrey W. Bullard
Virtual measurements are the outputs of well-defined mathematical models based on theoretical principles and simulation algorithms. The VCCTL (Virtual Cement and Concrete Testing Laboratory) is a software system built by the Material and Construction

Association Characteristics in Spatial Statistics

September 12, 2006
Author(s)
Andrew L. Rukhin
A coefficient of association for two spatial sequences is suggested. Some properties of this characteristic are discussed. By using the Central Limit Theorem for stationary random fields its limiting asymptotic normality is derived for any error

Correlation for the Vapor Pressure of Mercury

September 12, 2006
Author(s)
Marcia L. Huber, Arno D. Laesecke, Daniel G. Friend
We present a new correlation for the vapor pressure of mercury that is valid from the triple point to the critical point. The equation is a Wagner-type form, where the terms of the equation are selected using a simulated annealing optimization algorithm

Effective Link Triggers to Improve Handover Performance

September 11, 2006
Author(s)
Steve Woon, Nada T. Golmie, Y. A. Sekercioglu
Effective link layer triggering is key in order to enable fast and reliable handover across different access networks. In this paper, we investigate the use of signal strength as part of the trigger mechanism. We propose an analytical model to estimate the

Numerical Modeling of Diffusion-Induced Deformation

September 11, 2006
Author(s)
J A. Dantzig, William J. Boettinger, James A. Warren, Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
We present a numerical approach to modeling the deformation induced the the Kirkendall effect in binary alloys. The governing equations for isothermal binary diffusion are formulated with respect to inert markers and also with respect to the volume

Whisker Formation in Pb-Free Surface Finishes

September 11, 2006
Author(s)
Gery R. Stafford, Maureen E. Williams, C E. Johnson, Kil-Won Moon, Ugo Bertocci, William J. Boettinger
High purity bright Sn, Sn-Cu and Sn-Pb layers measuring 3,7 and 16 microns thick were electrodeposited onto phosphor bronze cantilever beams in a rotating disk apparatus. Beam deflection measurements within 15 min. of plating proved that all

Determination of Lipid Phase Transition Temperatures in Hybrid Bilayer Membranes

September 9, 2006
Author(s)
Neil A. Anderson, Lee J. Richter, John C. Stephenson, Kimberly A. Briggman
The main gel to liquid crystal (LC) phase transition temperature, Tm, of the lipid monolayers in hybrid bilayer membranes (HBMs) was investigated using vibrational sum frequency spectroscopy (VSFS). The unique sensitivity of VSFS to probe order/disorder

Microwave Spectrum and Structure of Furfural

September 8, 2006
Author(s)
R A. Motiyenkoa, E A. Alekseev, S F. Dyubkoa, Francis J. Lovas
The microwave spectrum of furfural was investigated in the frequency range 7 GHz to 21 GHz and 49 GHz to 330 GHz. The ground and first torsional state of trans-furfural and ground state of cis-furfural were assigned and analyzed. A total of 1720 rotational

Elimination of two level fluctuators in superconducting quantum bits by an epitaxial tunnel barrier

September 7, 2006
Author(s)
Seongshik Oh, Katarina Cicak, Jeffrey S. Kline, Mika Sillanpaa, Jed D. Whittaker, Raymond W. Simmonds, David P. Pappas, Kevin Osborn
Quantum computing based on Josephson junction technology is considered promising due to its scalable architecture. However, decoherence is a major obstacle. Here, we report evidence for improved Josephson quantum bits qubits using a single-crystal Al2O3
Displaying 33701 - 33725 of 73697
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