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Displaying 33826 - 33850 of 73832

Fiber Frequency Combs: Development and Applications

September 19, 2006
Author(s)
Nathan R. Newbury, William C. Swann, Ian R. Coddington, John J. McFerran
The output of a femtosecond fiber laser provides a comb of lines in frequency space that can be phase-locked to either a microwave or optical reference to form a stable frequency comb. We discuss the basic configuration of fiber laser-based frequency combs

Einstein-de Haas effect in a NiFe film deposited on a microcantilever

September 18, 2006
Author(s)
Thomas Mitchell (Mitch) Wallis, John M. Moreland, Pavel Kabos
A new methods is presented for determining the magetomechanical ratio, g', in a thin ferromagnetic film deposited on a microcantilever via measurement of the Einstein-de Haas effect. An alternating magnetic field applied in the plane of the cantilever and

Guided Data Capture software (GDC 4.0)

September 18, 2006
Author(s)
Vladimir Diky, Robert D. Chirico, Michael D. Frenkel
Guided data capture software (GDC 4.0) is software for structured capture of experimental thermophysical and thermochemical property data for molecular chemical systems involving one, two, and three components, and chemical reactions. Property values are

Parametric Uncertainty in Optical Image Modeling

September 18, 2006
Author(s)
James E. Potzick, Egon Marx, M P. Davidson
Optical photomask feature metrology and wafer exposure process simulation both rely on optical image modeling for accurate results. While it is fair to question the accuracies of the available models, model results also depend on several input parameters

The 2005 Materials Research Society (MRS) Fall Meeting

September 18, 2006
Author(s)
Winnie K. Wong-Ng
The 2005 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheration Boston Hotel, starting the weekend following the Thanksgivings Holidays from November 27 to December 2. This large-scale meeting included

A Straightforward Frequency-Estimation Technique for GPS Carrier-Phase Time Transfer

September 15, 2006
Author(s)
C Hackman, Judah Levine, Thomas E. Parker, Dirk Piester, Juergen Becker
GPS carrier-phase time transfer (GPSCPTT) offers high frequency stability at short averaging times, approaching a fractional frequency stability of 10 -15 at an averaging time of 1 d. However, a discontinuity occurs in the time-transfer estimates between

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
Displaying 33826 - 33850 of 73832
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