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Displaying 27626 - 27650 of 73960

Biometrics Systems Include Users

December 16, 2009
Author(s)
Mary F. Theofanos, Ross J. Micheals, Brian C. Stanton
Where do biometrics come from? The “canonical” standard (Wayman) biometric system model includes the biometric presentation and a biometric sensor but not the user themselves. Having this model facilitates having shared vocabulary and abstraction for

Carbon Weight Analysis for Machining Operation and Allocation for Redesign

December 16, 2009
Author(s)
Gaurav Ameta, Mahesh Mani, Sudarsan Rachuri, Kevin W. Lyons, Shaw C. Feng, Ram D. Sriram
The objective of this research is to explore and develop a new methodology for computing carbon weight (CW) - often referred to as carbon footprint, in manufacturing processes from the part level to assembly level. In this initial study we focused on

Electronics for a Next-Generation SQUID-Based Time-Domain Multiplexing System

December 16, 2009
Author(s)
Carl D. Reintsema, Gene C. Hilton, Kent D. Irwin, Joseph S. Adams, Robert Baker, Simon R. Bandler, William B. Doriese, Enectali Figueroa-Feliciano, Richard L. Kelly, Caroline A. Kilbourne, F. S. Porter, Jeff Krinsky, Patrick Wikus
A decade has elapsed since the design, development and realization of a SQUID-based time-division multiplexer at NIST. During this time the system has been used extensively for low-temperature-detector-array measurements. Concurrently, there have been

Many-Pole Model of Inelastic Losses Applied to Calculations of XANES

December 16, 2009
Author(s)
Eric L. Shirley, Joshua J. Kas, J. T. Vinson, N. Trcera, D. Cabaret, John J. Rehr
Conventional Kohn-Sham band-structure methods for calculating deep-core x-ray spectra typically neglect photo-electron self-energy effects, which give rise to an energy dependent shift and broadening of the spectra. Here an a posteriori procedure is

Optimal filtering, record length, and count rate in transition-edge-sensor microcalorimeters

December 16, 2009
Author(s)
William B. Doriese, Gene C. Hilton, Kent D. Irwin, Francis J. Schima, Joel N. Ullom, Joseph S. Adams, Caroline A. Kilbourne
In typical algorithms for optimally filtering transition-edge-sensor-microcalorimeter pulses, the average value of a filtered pulse is set to zero. The achieved energy resolution of the detector then depends strongly on the chosen length of the pulse

Progress Toward Corrugated Feed Horn Arrays in Silicon

December 16, 2009
Author(s)
Joseph W. Britton, Ki W. Yoon, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Gene C. Hilton, Michael D. Niemack, Kent D. Irwin
We are developing monolithic arrays of corrugated feed horns fabricated in silicon for dual-polarization single mode operation at 90, 145 and 220 GHz. The arrays consist of hundreds of platelet feed horns assembled from gold coated stacks of micromachined

QOD Standalone Users Guide

December 16, 2009
Author(s)
Julien C. Cuvillier, Katherine C. Morris
This report describes installation and use of the XML Schema Quality of Design Standalone testing system, or QOD Standalone. QOD Standalone is one of several tools produced by NIST's XML Testbed project within the Manufacturing Systems Integration Division

Architecture and Dynamics of C18 Bonded Interphases with Small Molecule Spacers

December 15, 2009
Author(s)
Lane C. Sander, Katrice A. Lippa, Catherine A. Rimmer, Maximilian Kuhnle, Volker Friebolin, Klaus Albert
The relationship between alkyl phase structure and chromatographic performance is investigated for a series of octadecyl (C18)- modified silica surfaces with defined spacing of the alkyl surface by a “pre-endcapping” technique. Stationary phases were

Effect of Diamond Nanolubricant on R134A Pool Boiling Heat Transfer

December 15, 2009
Author(s)
Mark A. Kedzierski
This paper quantifies the influence of diamond nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. Nanofluids are liquids that contain dispersed nano-size particles. A lubricant based

Nanoelectronic Fabrication with Flip Chip Lamination

December 15, 2009
Author(s)
Mariona Coll Bau, Curt A. Richter, Christina Hacker
Nanoelectronic fabrication with Flip chip lamination Mariona Coll, CA Richter, CA Hacker, Colloquium Catalan Institute of Nanoscience and Nanotechnology CIN2, Barcelona Spain, Dec 2009.

The Science of Interaction

December 15, 2009
Author(s)
Theresa O'Connell, John Stasko, John Dill, William Pike, Alan MacEachren
There is a growing recognition within the visual analytics community that interaction and inquiry are inextricable. It is through the interactive manipulation of a visual interface the analytic discourse that knowledge is constructed, tested, refined, and

Ultrafast Demagnetization Dynamics at the M Edges of Magnetic Elements Observed Using a Tabletop High-Harmonic Soft X-Ray Source

December 15, 2009
Author(s)
Thomas J. Silva, Justin Shaw, Hans Nembach, Chan La-O-Vorakiat, Mark Siemens, Margaret M. Murnane, Henry C. Kapteyn, Stefan Mathias, Martin Aeschlimann, Patrik Grychtol, Roman Adam, Claus M. Schneider
We use few-femtosecond soft x-ray pulses from high-harmonic generation to extract element-specific demagnetization dynamics and hysteresis loops of a compound material for the first time. Using a geometry where high-harmonic beams are reflected from a

A Structural Approach to the Temporal Modeling of Networks

December 14, 2009
Author(s)
Brian D. Cloteaux, Isabel M. Beichl
Simulation of many dynamic real world systems such as the Internet and social networks requires developing dynamic models for the underlying networks in these systems. Currently, there is a large body of work devoted towards determining the underlying

Marketplace Assessment - Metric Labeling on Packages in Retail Stores

December 14, 2009
Author(s)
Elizabeth J. Benham
Use of metric labeling on United States consumer products has a long history. Currently, the Fair Packaging and Labeling Act (FPLA) requires dual unit labeling, while products regulated by states under the Uniform Packaging and Labeling Regulation (UPLR)

Quantum information processing and quantum control with trapped atomic ions

December 14, 2009
Author(s)
David J. Wineland
The role of trapped atomic ions in the field of quantum information processing is briefly reviewed. We discuss some of the historical developments that enabled ions to enter the field and then summarize the basic mechanisms required for logic gates and the

ThermoML an XML-based Approach for Storage and Exchange of Experimental and Critically Evaluated Thermophysical and Thermochemical Property Data. 4. Biomaterials

December 12, 2009
Author(s)
Robert D. Chirico, Michael D. Frenkel, Vladimir Diky, Robert N. Goldberg, Heiko Heerklotz, John E. Ladbury, David P. Remeta, John H. Dymond, Anthony R. Goodwin, Kenneth N. Marsh, William A. Wakeham
ThermoML is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the representation of properties of biomaterials are described. The

EXAFS Studies of Catalytic DNA Sensors for Mercury Contamination of Water

December 11, 2009
Author(s)
Bruce D. Ravel, S.C. Slimmer, X. Meng, G.C.L. Wong, Y. Lu
Monitoring of metallic contaminants in domestic and agricultural water systems systems requires technology that is fast, flexible, sensitive, and selective. Recently, metal sensors based on catalytic DNA have been demonstrated as a practical monitoring

Interlaboratory Study of Alternate Filter Papers for Use in ASTM E 2187

December 11, 2009
Author(s)
Richard G. Gann, William F. Guthrie
ASTM E 2187 has become the internationally referenced standard for designing and specifying less fire-prone cigarettes. In this test method, a lit cigarette is laid on multiple layers of filter paper, and the observer identifies whether the cigarette burns

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles
Displaying 27626 - 27650 of 73960
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