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Search Publications

NIST Authors in Bold

Displaying 31226 - 31250 of 73697

Current Status of the Quantum Metrology Triangle

January 18, 2008
Author(s)
Mark W. Keller
The quantum metrology triangle is a test of the consistency of three quantum electrical standards: the single-electron tunneling current standard, the Josephson voltage standard, and the quantum Hall resistance standard. This paper considers what is known

Demonstration of a Multiplexer of Dissipationless SQUIDs}

January 18, 2008
Author(s)
John Mates, Gene C. Hilton, Kent D. Irwin, Leila R. Vale, Konrad Lehnert
We report on the development of a microwave SQUID multiplexer for reading out arrays of low-temperature detectors. In this frequency-division multiplexer, each SQUID couples to a high-Q superconducting resonator so that flux through the SQUID shifts the

The Modified-Single Fiber Test: A Methodology for Monitoring Ballistic Performance

January 18, 2008
Author(s)
Jae Hyun Kim, Walter G. McDonough, William R. Blair, Gale A. Holmes
In an effort to develop a minimally invasive testing methodology for monitoring the in-service performance of soft body armor, the ASTM D3379-75 standard was modified by measuring the fiber diameter at 5 equally spaced locations along a 6 cm gauge length

Overcoming Impediments to Cell Phone Forensics

January 16, 2008
Author(s)
Wayne Jansen, Aurelien M. Delaitre, Ludovic Moenner
Cell phones are an emerging but rapidly growing area of computer forensics. While cell phones are becoming more like desktop computers functionally, their organization and operation are quite different in certain areas. For example, most cell phones do not

256-channel magnetic imaging system

January 15, 2008
Author(s)
Fabio C. Da Silva, Sean Halloran, Anthony B. Kos, David P. Pappas
We present the design and fabrication of a magnetoresistive imaging system capable of scanning 256 channels simultaneously along linear ranges of either 4 or 13 mm. High speed electronics read the channels and transfer the data to a computer that builds

A Weighted GCV Method for Lanczos Hybrid Regularization

January 15, 2008
Author(s)
Julianne Chung, James G. Nagy, Dianne M. O'Leary
Lanczos-hybrid regularization methods have been proposed as effective approaches for solving large-scale ill-posed inverse problems. Lanczos methods restrict the solution to lie in a Krylov subspace, but they are hindered by semi-convergence behavior, in

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
Displaying 31226 - 31250 of 73697
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