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Displaying 24151 - 24175 of 73985

Performance Evaluation Experiments on a Laser Spot Triangulation Probe

November 25, 2011
Author(s)
Balasubramanian Muralikrishnan, Wei Ren, Dennis S. Everett, Eric S. Stanfield, Theodore D. Doiron
Laser triangulation probes are increasingly used for dimensional measurements in a variety of applications. At the National Institute of Standards and Technology, we have recently explored the use of laser spot triangulation probes to determine dimensional

Quantum simulation of the hexagonal Kitaev model with trapped ions

November 25, 2011
Author(s)
Dietrich G. Leibfried, Roman Schmied , Janus H. Wesenberg
We present a detailed study of quantum simulations of coupled spin systems in surface-electrode ion-trap arrays, and illustrate our findings with a proposed implementation of the hexagonal Kitaev model [A. Kitaev, Annals of Physics 321,2 (2006)]. The e

Isotope Dilution Liquid Chromatography - Mass Spectrometry Methods for Fat- and Water-Soluble Vitamins in Nutritional Formulations

November 24, 2011
Author(s)
Karen W. Phinney, Catherine A. Rimmer, Jeanice M. Brown Thomas, Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise
Vitamins are essential to human health, and dietary supplements containing vitamins are widely used by individuals hoping to ensure they have adequate intake of these important nutrients. Measurement of vitamins in nutritional formulations is necessary to

Standard Reactions for Comparative Rate Studies: Experiments on the Dehydrochlorination Reactions of 2 Chloropropane, Chlorocyclopentane and Chlorocyclohexane

November 23, 2011
Author(s)
Iftikhar A. Awan, Donald R. Burgess Jr., Wing Tsang, Jeffrey A. Manion
Single pulse shock tube studies of the thermal dehydrochlorination reactions (chlorocyclopentane → cyclopentene + HCl) and (chlorocyclohexane → cyclohexene + HCl) at temperatures of 843 to 1021 K and pressures of 1.4 to 2.4 bar have been carried out using

Guidelines for Fire Design of Steel Beam-Columns: Part II, Beams.

November 22, 2011
Author(s)
M. M. Dwaikat, V. K. Kodur
Steel structures when exposed to fire develop significant fire induced forces and deformations, and these effects are to be properly accounted for in evaluating realistic response of structural systems. The current design methodologies are based on

Ignition Propensity of Hydrogen in the Presence of Metal Surfaces.

November 22, 2011
Author(s)
Chih-Jen Sung, James S. T'ien, Kyle Brady
Hydrogen as an energy carrier has received much attention in recent years as a result of a confluence of economic, environmental, and political pressures on the continued use of fossil fuels. The benefits of using hydrogen fuel over fossil fuel products

Wildfire Modeling.

November 22, 2011
Author(s)
Steven K. Krueger
This report documents the development and testing of the LES (Large Eddy Simulator) version of the WRF (Weather Research and Forecasting) model coupled with SFIRE, the wildland surface fire module, to simulate wildland fires. The relevance of this work to

Tracking the National Fire Problem: The Data behind the Statistics

November 21, 2011
Author(s)
Douglas S. Thomas, David T. Butry
The objective of this report is to support the development of descriptive statistics and associated measures of uncertainty for characterizing, tracking, and better understanding the root causes of the U.S. fire burden by identifying the relevant costs and

Phase-Sensitive Specular Neutron Reflectometry for Imaging the Nanometer Scale Compositional Depth profile of Thin-Film Materials

November 20, 2011
Author(s)
Brian Kirby, Paul A. Kienzle, Brian B. Maranville, Norman F. Berk, J. Krycka, Frank Heinrich, Charles Majkrzak
Neutron reflectometry is a powerful method for probing the molecular scale structure of both hard and soft condensed matter films. Moreover, the phase-sensitive methods which have been developed make it possible for specular neutron reflectometry to be

Evaluation of Proposed Test Artifacts for Five-Axis Machine Tools

November 18, 2011
Author(s)
Shawn P. Moylan, David Blumenfeld, Michael L. McGlauflin, Ronnie R. Fesperman Jr., M A. Donmez
Machining of a test artifact is an attractive method of evaluating the performance of a machine tool because the tests are often quick and do not require special instrumentation. An appropriate artifact should be complex enough to assess a machine's

Giant piezoelectricity on Si for hyperactive MEMS

November 18, 2011
Author(s)
S. H. Baek, J. Park, D. M. Kim, Vladimir Aksyuk, R. R. Das, S. D. Bu, D. A. Felker, J. Lettieri, V Vaithyanathan, S. Bharadwaja, N. Bassiri-Gharb, Y. B. Chen, H. P. Sun, C. M. Folkman, H. W. Jang, D. J. Kreft, S K. Streiffer, R. Ramesh, X Q. Pan, S Trolier-McKinstry, Darrell G. Schlom, M. S. Rzchowski, R. Blick, C. B. Eom
Smart materials that can sense, manipulate, and position are crucial to the functionality of micro- and nano-machines [1-2]. Integration of single crystal piezoelectric films on silicon offers the opportunity of high performance piezoelectric

Origin of Electrical Signals for Plasma Etching Endpoint Detection

November 18, 2011
Author(s)
Mark A. Sobolewski
Electrical signals are used for endpoint detection in plasma etching, but the origin of the electrical changes observed at endpoint is not known. They may be caused by changes in the gas-phase densities of etch products and reactants or by changes in

TSOM Method for Nanoelectronics Dimensional Metrology

November 18, 2011
Author(s)
Ravikiran Attota
Through-focus scanning optical microscopy (TSOM) is a relatively new method that transforms conventional optical microscopes into truly three-dimensional metrology tools for nanoscale to microscale dimensional analysis. TSOM achieves this by acquiring and

DEMONSTRATION OF AN INTEGRATED MICRO CRYOGENIC COOLER AND MINIATURE COMPRESSOR FOR COOLING TO 200 K

November 17, 2011
Author(s)
Ryan J. Lewis, Mu Hong Lin, Yunda Wang, Jill Cooper, Peter E. Bradley, Ray Radebaugh, Marcia L. Huber, Yung-Cheng Lee
Joule-Thompson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a
Displaying 24151 - 24175 of 73985
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