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Search Publications

NIST Authors in Bold

Displaying 32451 - 32475 of 73697

Visualization and Modeling of Smoke Transport Over Landscape Scales

May 1, 2007
Author(s)
Glenn P. Forney, William E. Mell
Computational tools have been developed at the National Institute of Standards and Technology (NIST) for modeling fire spread and smoke transport. These tools have been adapted to address fire scenarios that occur in the wildland urban interface (WUI) over

Manipulation of the Vortex Motion in Nanostructured Ferromagnetic/Superconductor Hybrids

April 30, 2007
Author(s)
A V. Silhanek, W Gillijns, V V. Moshchalkov, V Metlushko, F Gozzini, B Ilic, Willard C. Uhlig, John Unguris
The authors investigate the rectified motion of vortices in superconducting films deposited on top of a close-packed array of open in-plane magnetized triangular micromagnets. The dc voltage induced by the vortex drift under an ac excitation is recorded

Metrics to Estimate Image Quality in Compressed Video Sequences

April 30, 2007
Author(s)
G O'Brien, S Israel, J Irvine, Charles D. Fenimore, John W. Roberts, Michelle Brennan, D Cannon, J Miller
A fundamental problem in image processing is to find objective metrics that parallel human perception of image quality. In this study, several metrics were examined to quantify compression algorithms in terms of perceived loss in image quality. In addition

Perceived Interpretability of Motion Imagery: Implications for Scale Development

April 30, 2007
Author(s)
J Irvine, G O'Brien, S Israel, Charles D. Fenimore, John W. Roberts, Michelle Brennan, Jeffrey Bartolucci, D Cannon
The motion imagery community would benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable

Specification-Driven Testing of Smart Card Interface Using a Formal Model

April 30, 2007
Author(s)
Ramaswamy Chandramouli, Mark Blackburn
Model-Driven Engineering (MDE) is emerging as a promising approach that uses models to support various phases of system development lifecycle such as Code Generation and Verification/Validation (V &V). In this paper, we describe the application of a model

TRC Thermodynamics Tables - Hydrocarbon Supplement No. H133

April 30, 2007
Author(s)
Michael D. Frenkel
1. Table 23-2-(1.20238)-db: Pages db-1476.0 and db-1476.1 New table for 2,3-dimethylpentane containing the density for the real fluid at selected temperatures and pressures. 2. Table 23- 2-(3.35162)-db: Pages db-2216.0 and db-2216.1 New table for cis

User-Oriented Evaluation of Compression for Motion Imagery

April 30, 2007
Author(s)
J Irvine, G O'Brien, J Miller, S Israel, Charles D. Fenimore, John W. Roberts, Michelle Brennan, Jeffrey Bartolucci, D Cannon
Motion imagery will play a critical role in future intelligence and military missions. The ability to provide a real time, dynamic view and persistent surveillance makes motion imagery a valuable source of information. The ability to collect, process

Errors in trapped-ion quantum gates due to spontaneous photon scattering

April 27, 2007
Author(s)
R Ozeri, Wayne M. Itano, Brad R. Blakestad, Joseph W. Britton, J Chiaverini, John D. Jost, C. Langer, Dietrich G. Leibfried, Rainer Reichle, Signe Seidelin, Janus Wesenberg, David J. Wineland
We analyze the error in trapped-ion, hyperfine qubit, quantum gates due to spontaneous scattering of photons from the gate laser beams. We investigate the error in single-ion-qubit rotations that are based on stimulated Raman transitions and in two-ion

Simulation of Nanotube Separation in Field-Flow Fractionation (FFF)

April 27, 2007
Author(s)
Frederick R. Phelan Jr., Barry J. Bauer
A Brownian dynamics simulation of prolate ellipsoidal particles is developed to investigate the separation of nanotubes in flow-FFF. The particle motions are governed by stochastic forms of a linear momentum balance with orientation dependent drag and

Securing Wireless Networks

April 26, 2007
Author(s)
Shirley M. Radack
This bulletin summarizes the recommendations developed by NIST to assist organizations in establishing and maintaining robust security for wireless local area networks (WLAN) using the new security features that were developed for IEEE 802.11i. Topics

The 2006 Materials Research Society (MRS) Fall Meeting Report

April 26, 2007
Author(s)
Winnie K. Wong-Ng
The 2006 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheraton Boston Hotel, starting the weekend following the Thanksgiving Holidays from November 26 to December 1. This large-scale meeting included forty

Determination of Bitter Orange Alkaloids in Dietary Supplements Standard Reference Materials by Liquid Chromatography With Ultraviolet Absorbance and Fluorescence Detection

April 24, 2007
Author(s)
Karsten Putzbach, Katherine E. Sharpless, Lane C. Sander
Four adrenergic amines [(+/-) synephrine, (+/-) octopamine, tyramine, and n-methyltyramine) were determined in a variety of Citrus aurantium (Bitter Orange) containing dietary supplements. Two extraction techniques were evaluated in detail: Soxhlet

Determination of Caffeine, and Caffeine-Related Metabolites in Ephedra-Containing Standard Reference Materials Using Liquid Chromatography With Absorbance Detection and Tandem Mass Spectrometry

April 24, 2007
Author(s)
Jeanice M. Brown Thomas, Katherine E. Sharpless, S. Mitvalsky, Mark Roman, James H. Yen, Mary B. Satterfield
The concentration of caffeine and caffeine-related compounds in two ephedra-containing reference materials have been determined by three independent methods with measurements performed by the National Institute of Standards and Technology (NIST) and a

Microfluidic Directed Formation of Liposomes of Controlled Size

April 24, 2007
Author(s)
Andreas Jahn, Wyatt N. Vreeland, Don DeVoe, Laurie E. Locascio, Michael Gaitan
A new method to tailor liposome size and size distribution in a microfluidic format is presented. Liposomes are spherical structures formed from lipid bilayers that are from tens of nanometers to several micrometers in diameter. Liposome size and size

Complex Permittivity Measurements at Millimeter Wave Frequencies

April 23, 2007
Author(s)
Billy F. Riddle, Michael D. Janezic
Contemporary circuit designers are requiring larger bandwidths from microsystems to accomodate the ever-increasing demand for denser content. The electrical performance of these microsystems is intrisically related to the electromagnetic properties of the

Ferroelectric Distortion in SrTiO3 Thin Films on Si(001) by X-Ray Absorption Fine Structure: Experiment and First-Principles Calculations

April 23, 2007
Author(s)
Joseph C. Woicik, Eric L. Shirley, C S. Hellberg, S Sambasivan, Daniel A. Fischer, B D. Chapman, E A. Stern, P Ryan, D L. Ederer, H Li
Ti K and Ti L2,3 edge x-ray absorption fine-structure near-edge spectra of SrTiO3 thin films grown coherently on Si(001) reveal the presence of a ferroelectric (FE) distortion at room temperature. This unique phase is a direct consequence of the

Fracture Toughness through a Welded Pipeline Section - Crack Tip Opening Angle Criterion

April 23, 2007
Author(s)
Philippe P. Darcis, Christopher N. McCowan, Elizabeth S. Drexler, Joseph D. McColskey, Avigdor Shtechman, Thomas A. Siewert
The increasing demand for natural gas as an alternative energy source implies continued growth of gas pipeline installations. This trend compels the natural gas transmission industry to consider the construction of larger-diameter, higher-pressure
Displaying 32451 - 32475 of 73697
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