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Displaying 32526 - 32550 of 73929

Effect of the Spherical Indenter Tip Assumption on Nanoindentation

June 1, 2007
Author(s)
Li Ma, Lyle E. Levine
Nanoindentation is increasingly being used to explore mechanical properties on a local scale. One of the interests and challenges of nanoindentation is determining the shear stress at the onset of plastic yielding, which corresponds to dislocation

Measurement of Weld Toughness - Crack Tip Opening Angle Criterion

June 1, 2007
Author(s)
Philippe P. Darcis, Joseph D. McColskey, Christopher N. McCowan, Thomas A. Siewert
The stable tearing behavior of X100 pipeline steel through a girth weld section was investigated using a modified double cantilever beam specimens. A test technique for direct measurement of the steady state crack tip opening angle (CTOA) criterion was

Numerical Fluorescence Correlation Spectroscopy for Molecular Dynamics Analyses Under Non-Standard Conditions

June 1, 2007
Author(s)
Michael J. Culbertson, Joshua T. Williams, Wayland Cheng, Dee A. Stults, Emily R. Wiebrach, John J. Kasianowicz, Daniel L. Burden
A major concern in Fluorescence Correlation Spectroscopy (FCS) pertains to the accuracy of standard mathematical models that are used to extract kinetic information from correlated data. The standard equations used in FCS arise from a simple Gaussian model

Observation of the 1 S 0 - 3 P 0 clock transition in 27 Al +

June 1, 2007
Author(s)
Till P. Rosenband, P. O. Schmidt, David Hume, Wayne M. Itano, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Jeroen Koelemeij, James C. Bergquist, David J. Wineland
We report for the first time, laser spectroscopy of the 1S 0 – 3P 0 clock transition in 27Al +. A single aluminum ion and a single beryllium ion are simultaneously confined in a linear Paul trap, coupled by their mutual Coulomb repulsion. This coupling

Optical and Structural Study of GaN Nanowires Grown by Catalyst-Free MBE: (II) Defect-Related Luminescence and Electron-Beam Irradiation Effects

June 1, 2007
Author(s)
Lawrence H. Robins, Kristine A. Bertness, John G. Barker, Norman A. Sanford, John B. Schlager
GaN nanowires grown by catalyst free molecular beam epitaxy were characterized by photoluminescence (PL) and cathodoluminescence (CL) spectroscopy at temperatures from 3 K to 295 K. Both as grown samples, which contained approximately vertically oriented

Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors

June 1, 2007
Author(s)
Hiroki Takesue, Sae Woo Nam, Qiang Zhang, Robert Hadfield, Toshimori Honjo, Kiyoshi Tamaki, Yoshihisa Yamamoto
We report the first quantum key distribution (QKD) experiment to enable the creation of secure keys over 42 dB channel loss and 200 km of optical fibre. We used the differential phase shift QKD (DPS-QKD) protocol, implemented with a 10-GHz clock frequency

Spotlighting NIST Standard Reference Materials - New Standard Reference Material (SRM) 2585 Organic Contaminants in House Dust to Support Exposure Assessment Measurements

June 1, 2007
Author(s)
Michele M. Schantz, Jennifer M. Lynch, John R. Kucklick, Dianne L. Poster, H M. Stapleton, S S. Vander Pol, Stephen A. Wise
House dust originates from both internal and external sources and has been identified as one of the primary sources of lead exposure for children (http://www.epa.gov/lead). House dust is also a repository for pesticides, flame retardants, and other

Static Calibration and Dynamic Characterization of PMUs at NIST

June 1, 2007
Author(s)
Gerard N. Stenbakken, Thomas L. Nelson
This paper describes the development of two test systems at NIST aimed at improving the calibration and characterization of Coordinated Universal Time (UTC) synchronized electric power instrumentation. Reference to UTC is used to meet the need for precise

Supplement to the 2004 Update of the AAPM Task Group No. 43 Report

June 1, 2007
Author(s)
Mark J. Rivard, Wayne Butler, Larry A. DeWerd, Saiful M. Huq, Geoffrey S. Ibbott, Christopher Melhus, Michael G. Mitch, Ravinder Nath, J Williamson
Since publication of the 2004 update to the American Association of Physicists in Medicine (AAPM) Task Group No. 43 Report (AAPM TG-43U1), several new low-energy photon-emitting brachytherapy sources have become available. Many of these sources have

The NIST Calibration Check Standards Database

June 1, 2007
Author(s)
Kevin G. Brady, Frederic J. de Vaulx, Randolph Elmquist
For several years now, NIST has been a leader in the development and use of Information Technology to process calibration information. Beginning in 1996, researchers designed and developed a calibration database, the NIST Information System to Support

Wavelength bistability in two-section mode-locked quantum-dot diode lasers

June 1, 2007
Author(s)
Mingming M. Feng, N. A. Brilliant, Steven T. Cundiff, Richard Mirin, Kevin L. Silverman
We report a two-section mode-locked quantum dot laser with an emission wavelength that is bistable with respect to applied bias on the saturable absorber region. The two stable lasing wavelengths for this device are 1173 nm and 1166 nm with a power
Displaying 32526 - 32550 of 73929
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