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Displaying 22401 - 22425 of 73829

A VIRTUAL MACHINE TOOL FOR THE EVALUATION OF STANDARDIZED 5-AXIS PERFORMANCE TESTS

October 26, 2012
Author(s)
Ronnie R. Fesperman Jr., Shawn P. Moylan, M A. Donmez
Standards committees are actively working to develop standard test methods for the performance evaluation of 5-axis machining centers through the direct and indirect measurement of simultaneous motions of all five axes [1-2]. However, the compound effect

Combinatorial Coverage Measurement

October 26, 2012
Author(s)
David R. Kuhn, Raghu N. Kacker, Yu Lei
Combinatorial testing applies factor covering arrays to test all t-way combinations of input or configuration state space. In some testing situations, it is not practical to use covering arrays, but any set of tests covers at least some portion of t-way

Effects of phase-breaking scattering on the thermopower of molecular systems.

October 26, 2012
Author(s)
Adrian Popescu, Paul M. Haney
We study the effects of elastic and inelastic scattering on the thermoelectric transport properties of molecular systems. These systems can exhibit high thermopower due to resonant transmission through molecular orbitals. We focus on systems which exhibit

SysML extension for dynamical system simulation tools

October 26, 2012
Author(s)
Ion Matei, Conrad E. Bock
Computer-interpretable representations of system structure and behavior are at the center of designing today’s complex systems. Engineers create and review such representations using graphical modeling languages that support specification, analysis, design

High temperature thermoelectric properties of p-type skutterudites BaxYbyCo4-zFezSb12

October 23, 2012
Author(s)
Yongkwan Dong, Pooja Puneet, Terry M. Tritt, Joshua Martin, George S. Nolas
Several polycrystalline p-type skutterudites with compositions BaxYbyCo4-zFezSb12, with varied filler concentrations x and y, and z = 1 to 2, have been synthesized by first reacting the constituents and subsequent solid state annealing, followed by

Anisotropic, Hierarchical Surface Patterns via Surface Wrinkling of Nanoimprinted Polymer Films

October 22, 2012
Author(s)
Junghyun Lee, Hyun W. Ro, Rui Huang, Thomas Germer, Paul Lemaillet, Christopher Soles, Christopher Stafford
we demonstrated the wrinkling behavior of nanopatterned PS films, whose wrinkle wavelength and resultant morphology depend strongly on geometric parameters of surface patterns as well as the direction of the applied strain relative to the nanopattern

Slot-mode-coupled optomechanical crystals

October 22, 2012
Author(s)
Marcelo I. Davanco, Jasper Chan, Amir H. Safavi-Naeini, Oskar Painter, Kartik A. Srinivasan
We design a cavity optomechanical system in which a localized GHz frequency mechanical mode of a nanobeam resonator is evanescently coupled to a high quality factor (Q > 10^6) optical mode of a separate nanobeam optical cavity. Using separate nanobeams

Temperature-dependent mechanical-resonance frequencies and damping in ensembles of gallium nitride nanowires

October 22, 2012
Author(s)
Kristine A. Bertness, Norman A. Sanford, J. R. Montague, H.S. Park, Victor M. Bright, Charles T. Rogers
We have measured singly clamped cantilever mechanical-resonances in ensembles of as-grown gallium nitridenanowires (GaN NWs), from 12 K to 320 K. Resonance frequencies are approximately linearly dependent on temperature near 300 K with relative shifts of

ROBOTICALLY CONTROLLED MM-WAVE NEAR-FIELD PATTERN RANGE

October 21, 2012
Author(s)
Josh Gordon, David R. Novotny, Jeffrey R. Guerrieri, Jason Coder, Michael Francis
The Antenna Metrology Lab at the National Institute of Standards and Technology in Boulder Colorado has developed a robotically controlled near-field pattern range for measuring antennas and quasi-optical components from 50 GHz to 500 GHz. This range is

An Improved Antenna Gain Extrapolation Measurement

October 20, 2012
Author(s)
Jason Coder, David R. Novotny, Jeffrey R. Guerrieri, Michael H. Francis, Brian C. Stillwell
An improved antenna gain extrapolation measurement is proposed. The improved method consists of a vector network analyzer, a pair of RF optical links, and a pair of waveguide mixers. We present a detailed description of the new extrapolation measurement

Definite integrals using orthogonality and integral transforms

October 19, 2012
Author(s)
Howard S. Cohl, Hans Volkmer
We obtain definite integrals for products of associated Legendre functions with Bessel functions, associated Legendre functions, and Chebyshev polynomials of the first kind using orthogonality and integral transforms.

NIST ADVANCES IN COMPUTER-AIDED AND COMPUTATIONAL METHODS IN WIND ENGINEERING

October 19, 2012
Author(s)
Dong Hun Yeo, Franklin T. Lombardo, Dilip K. Banerjee, Eric J. Letvin, Emil Simiu, Marc L. Levitan, Florian A. Potra
The paper summarizes recent research and development of computer-aided and computational methods in wind engineering at the National Institute of Standards and Technology (NIST). Specific topics to be covered include: 1. Time-domain database-assisted

Selective Streptavidin Bioconjugation on Si, SiC, and GaN Nanowires for Biosensor Applications.

October 19, 2012
Author(s)
Elissa H. Williams, John A. Schreifels, Mulpuri V. Rao, Albert Davydov, Vladimir Oleshko, Nancy Lin, Kristen L. Steffens, Sergiy Krylyuk, Kristine A. Bertness, Amy Manocchi, Yaroslav Koshka
A functionalization method for the specific and selective immobilization of the streptavidin (SA) protein on semiconductor nanowires (NWs) was developed. Silicon (Si), silicon carbide (SiC), and gallium nitride (GaN) NWs were functionalized with 3

The distance dependences and spatial uniformities of spectral irradiance standard lamps

October 19, 2012
Author(s)
Howard W. Yoon, Gary D. Graham, Robert D. Saunders, Yuqin Zong, Eric L. Shirley
We describe the characterization of a group of NIST spectral irradiance lamps at longer distances and larger angles than are typically issued by NIST. The spectral irradiances from the FEL lamps were measured from 50 cm to 150 cm at 8 different distances
Displaying 22401 - 22425 of 73829
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