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Displaying 31451 - 31475 of 73929

Instability in Pipe Flow

January 15, 2008
Author(s)
David Cotrell, Geoffrey B. McFadden, W. E. Alley, B. J. Alder
An axisymmetric linear stability analysis is carried out for flow driven by an axial pressure gradient in a pipe with axisymmetric and axially-periodic radius variation (i.e., axial corrugation). The steady base flow is assumed to be axisymmetric and

Measurements of the isochoric heat capacity, the critical point (Tc, pc) and vapor-liquid coexistence curve (Ts, ps) of high-purity toluene near the critical point

January 15, 2008
Author(s)
Ilmutdin Abdulagatov, Nikolai G. Polikhronidi, Thomas J. Bruno, Rabiyat G. Batyrova, Genadii V. Stepanov
Isochoric heat capacities, phase boundary properties and the critical parameters for high purity (0.9999 mole fraction) toluene have been measured using a high temperature, high pressure, nearly constant volume adiabatic calorimeter and quasi-static

Evaluating Visual Analytics: The 2007 Visual Analytics Science and Technology Symposium Contest

January 14, 2008
Author(s)
Catherine Plaisant, Georges Grinstein, Jean Scholtz, Mark Whiting, Theresa O'Connell, Sharon J. Laskowski, T Chien, A Tat, W Wright, C Gorg, Z Liu, N Parekh, K Singhal, John Stasko
The second Visual Analytics Science and Technology (VAST) contest?s data consisted of a heterogeneous synthetic collection of news articles with additional supporting files and contained a scenario with embedded threats that provided ground truth. Using

Latent Fingerprint Performance Modeling

January 14, 2008
Author(s)
Vladimir N. Dvornychenko
This paper describes aspects of work done at NIST, in concert with the latent fingerprint community, toward achieving a partial lights-out latent fingerprint processing capability. The initial steps are to quantify performance over a cross-section of

On the nature of asymetry of nucleation centers activity in ultrathin Co films and Co/Pt multilayers

January 14, 2008
Author(s)
Yu L. Iunin, Yury P. Kabanov, Valerian I. Nikitenko, X M. Cheng, Alexander J. Shapiro, C L. Chien, Robert D. Shull
Magnetization reversal in ultrathin Pt(10 nm)/Co(0.6 nm)/Pt(3 nm) magnetic films and Pt(10 nm)/[Co(d)/Pt(1 nm)]_n}/ Pt(2 nm) (d = 0.4, 0.6, 0.8 nm, n = 2, 4) multilayers with perpendicular anisotropy has been studied using Kerr microscopy. These materials

Rubidium Vapor Cell with Integrated Nonmetallic Multilayer Reflectors

January 13, 2008
Author(s)
M A. Perez, U Nguyen, A Shkel, Svenja A. Knappe, Elizabeth A. Donley, John E. Kitching
This paper reports on a method for improving the optical efficiency of micromachined reflectors for use in rubidium vapor cells. A hybrid bulk micromachining / multilayer thin film technique is used to form the integrated reflectors, which can redirect

Probing molecules in integrated solid-state silicon junctions

January 12, 2008
Author(s)
Wenyong Wang, Adina Scott, Nadine Gergel-Hackett, Christina Hacker, David Janes, Curt A. Richter
In this research work, we fabricate integrated Si-SAMs-metal devices using the ?soft? top metal deposition technique and probe their electronic properties with IETS characterizations. IETS confirmed the existence of molecular species in the device area.

Reinvestigation of the Microwave Spectrum of 2-Methylmalonaldehyde

January 11, 2008
Author(s)
Vadim V. Ilyushin, E A. Alekseev, Y C. Chou, Y-C Hsu, Jon T. Hougen, Francis J. Lovas, L B. Picaux
The molecule 2-methylmalonaldehyde (2-MMA) exists in the gas phase as a six-membered hydrogen-bonded ring [HO-CH=C(CH3)-CH=O] and exhibits two large-amplitude motions, an intramolecular hydrogen transfer and a methyl torsion. The former motion is

Sigma Stellation: A Design Strategy for Electron Boxes

January 10, 2008
Author(s)
Karl K. Irikura
The carbon-fluorine antibonding (sigma*) orbitals in a fluorocarbon cage are directed toward a central, common point. If the cage is not too large or too small, the sigma* orbitals will overlap at that point. An added electron can occupy the resulting

Model for Reversible Nanoparticle Assembly in a Polymer Matrix

January 8, 2008
Author(s)
Andrew Rahedi, Jack F. Douglas, Francis W. Starr
The clustering of nanoparticles (NP) within solutions and polymer melts depends sensitively on the strength and directionality of the NP interactions involved, as well as the molecular geometry and interactions of the dispersing fluids. Since clustering

NIST Time and Frequency Bulletin

January 8, 2008
Author(s)
Eyvon Petty
The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

A Device for Mechanically Folding Yarns and Woven Fabrics of Ballistic Fibers

January 7, 2008
Author(s)
Walter G. McDonough, Jae Hyun Kim, Nolan J. Brandenburg, William R. Blair, Gale A. Holmes
Abstract (2000 characters maximum - spell out acronyms the first time)An apparatus was designed and built that attaches to servo-hydraulic machines that typically perform material fatigue testing. The device was designed to systematically fold woven fabric

Building a Test Suite for Web Application Scanners

January 7, 2008
Author(s)
Elizabeth N. Fong, Romain Gaucher, Vadim Okun, Paul E. Black, Eric Dalci
This paper describes the design of a test suite for thorough evaluation of web application scanners. Web application scanners are automated, black-box testing tools that examine web applications for security vulnerabilities. For several common

Reference Values for Dynamic Calibration of PMUs

January 7, 2008
Author(s)
Gerard N. Stenbakken, Thomas L. Nelson, Ming Zhou, Virgilio A. Centeno
This paper discusses measurements of the dynamic performance of electric power Phasor Measurement Units, PMUs, and their relation to the requirements of the IEEE Synchrophasor Standard C37.118-2005. In particular, it proposes a new method for monitoring

Towards the Complete Analysis of the Rotational Spectrum of (CH 3 ) 3 SnCl

January 7, 2008
Author(s)
Melanie Schnell, Jon T. Hougen, J U. Grabow
The rotational spectrum of the symmetric top trimethyl tin chloride (CH3)3SnCl has been studied using a pulsed molecular beam Fourier transform microwave spectrometer in the frequency range from 3 to 24 GHz. The spectrum is exceedingly complicated by the

Trap-Imbalanced Fermion Mixtures

January 7, 2008
Author(s)
Menderes Iskin, Carl J. Williams
We analyze the ground state phases of two-component population- andmass-balanced but trap-imbalanced fermion mixtures as a function of interactionstrength from the weak attraction Bardeen-Cooper-Schrieffer (BCS) to the strongattraction Bose-Einstein

X-Ray Topography to Characterize Surface Damage on CdZnTe Crystals

January 7, 2008
Author(s)
David R. Black, Joseph C. Woicik, Martine Duff, Douglas Hunter, Arnold Burger, Michael Groza
Synthetic CdZnTe or CZT crystals can be used for room temperature detection of ?-radiation. Structural/morphological heterogeneities within CZT, such as twinning, secondary phases (often referred to as inclusions or precipitates), and polycrystallinity can
Displaying 31451 - 31475 of 73929
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