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Displaying 39801 - 39825 of 74222

Applications of Sinkhorn Balancing: The Monomer-Dimer Problem

January 30, 2004
Author(s)
Isabel M. Beichl, Francis Sullivan
We describe a general Monte Carlo technique based on work of Knuth for estimating the size of trees in backtrack algorithms. This method, based on importance sampling, is used to estimate the number of partial and complete matchings in a bipartite graph

Micromachined Alkali Atom Vapor Cells for Chip-Scale Atomic Clocks

January 30, 2004
Author(s)
Li-Anne Liew, Svenja A. Knappe, John M. Moreland, Hugh Robinson, Leo W. Hollberg, John Kitching
This paper describes the fabrication of chip-sized alkali atom vapor cells, for use in highly miniaturized atomic frequency references, using silicon micromachining and anodic bonding technology. The cells consist of silicon cavities with internal volume

Interoperable Dynamic Tactical Information for Public Safety Officials

January 23, 2004
Author(s)
William D. Davis, D D. Evans
Currently, fire department notification of a building fire comes from either a building fire alarm system monitoring service or a 911 call. The emergency responders know very little about the situation until they arrive on the scene. Information for their

NCWM Publication 15, Interim Meeting Agenda - January 2004

January 21, 2004
Author(s)
Linda D. Crown
This is the agenda for the four Standing Committees of the National Conference on Weights and Measures. The meeting will be held at the Hyatt Regency Bethesda, Bethesda, MD, January 25-28, 2004.

Practical electron-tunneling refrigerator

January 21, 2004
Author(s)
Anna Clark, Anthony Williams, Steve Ruggiero, Marcel L. van den Berg, Joel N. Ullom
We demonstrate a thin-film, solid-state refrigerator based on the removal of hot electrons from a metal by quantum-mechanical tunneling. We have halved the electronic temperature in a macroscopic film from 260 mK to near 130 mK. Both the cooling power and

Progress in the Development of Combustion Databases for Liquid Fuels

January 21, 2004
Author(s)
Wing Tsang
This paper describes the present situation regarding chemical kinetic databases for the simulation of the combustion of liquid fuels. Past work in the area is summarized. Much is known about the, reactions of the smaller fragments from combustion process

Quantitative Characterization of DNA Films by X-ray photoelectron spectroscopy

January 20, 2004
Author(s)
D Y. Petrovykh, H Y. Kimura-Suda, Michael J. Tarlov, L J. Whitman
Self-assembled films of thiolated poly(dT)25 single-stranded DNA (ssDNA) on gold areintroduced as a model system for quantitative characterization of DNA films by XPS. Weevaluate the applicability of a simple substrate-overlayer model for data analysis

Adiabatic Loading of Bosons Into Optical Lattices

January 16, 2004
Author(s)
P B. Blakie, James V. Porto
We calculate the entropy-temperature curves for non-interacting bosons in a 3D optical lattice and a 2D lattice with transverse harmonic confinement for ranges of depths and filling factors relevant to current experiments. These curves predict regimes

Direct-Current Induced Dynamics in Co 90 Fe 10 /Ni 80 Fe 20 Point Contacts

January 16, 2004
Author(s)
William Rippard, Matthew Pufall, Shehzaad F. Kaka, Stephen E. Russek, Thomas J. Silva
We have directly measured coherent high-frequency magnetization dynamics in ferromagnetic films induced by a spin-polarized dc current. The precision frequency can be tuned over a range of several gigahertz by varying the applied current. The frequencies

Approximating Limit Cycles of a Van der Pol Equation with Delay

January 15, 2004
Author(s)
David E. Gilsinn
In this paper a theorem of Stokes is used to establish the existence of a periodic solution of a Van der Pol equation with fixed delay in the neighborhood of an approximating solution that satisfies a certain noncriticality condition.

Using Nonoscillatory Splines to Model Urban Environments

January 15, 2004
Author(s)
David E. Gilsinn, Marjorie A. McClain, Christoph J. Witzgall
In this paper we introduce the notion of Lavery splines and examine their properties in the univariate case. We also discuss some of the details involved with computing these splines on irregularly spaced data.

NIST-NPL Interlaboratory Pulse Measurement Comparison

January 13, 2004
Author(s)
Nicholas Paulter, A. G. Smith, Donald R. Larson, T. M. Souders, A. G. Roddie
A comparison of the pulse parameter values obtained from the pulse measurement services of the National Institute of Standards and Technology, USA and the National Physical Laboratory, UK was performed. The comparison was based on the pulse parameters of

Bayesian Analysis of Ceria Nanoparticles From Line Profile Data

January 12, 2004
Author(s)
N G. Armstrong, A Dowd, James Cline, W Kalceff
A Bayesian/Maximum entropy (MaxEnt) method is applied to quantify the broadening of X-ray line profiles in terms of the nanocrystallite size effects in ceria. The analysis is in general agreement with transmission electron microscopy results, while
Displaying 39801 - 39825 of 74222
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