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Journals

Large intrinsic effect of axial strain on the critical current of high-temperature superconductors for electric power applications

January 31, 2007

Author(s)

Daniel C. van der Laan, John (Jack) W. Ekin

A remarkably large reversible reduction in the critical current of "second generation" high-temperature superconductors for electric power applications has been...

Mapping Mechanical Properties on the Nanoscale with Atomic Force Acoustic Microscopy

January 31, 2007

Author(s)

Donna C. Hurley, Malgorzata Kopycinska-Mueller, Tony B. Kos

We are developing tools that use the atomic force microscope (AFM) to measure mechanical properties with nanoscale spatial resolution. Contact-resonance...

Correction of random surface roughness on colloidal probes in measuring

January 30, 2007

Author(s)

Seung Ho Yang, Huan Zhang, Stephen M. Hsu

A Physics Based Approach to Modeling Grassland Fires

January 30, 2007

Author(s)

William E. Mell, M A. Jenkins, J Gould, P Cheney

Physics based coupled fire-atmosphere models are based on approximations to the governing equations of fluid dynamics, combustion, and the thermal degradation...

Effective-Range Description of a Bose Gas Under Strong Confinement

January 29, 2007

Author(s)

Pascal Naidon, Eite Tiesinga, William F. Mitchell, Paul S. Julienne

We point out in this paper that previous theories describing s-wave collisions of atomic bosons confined in 1D or 2D geometries can be extended to much tighter...

Chemical Twinning of the Pyrochlore Structure in the System Bi₂O_3-Nb2O₅

January 28, 2007

Author(s)

Ian E. Grey, W G. Mumme, Terrell A. Vanderah, Robert S. Roth, C Bougerol-Chaillout

New ternary bismuth iron niobates having structures based on chemical twinning of pyrochlore are described. Bi5.67Nb10FeO35 has hexagonal symmetry, P63/mmc, a =...

Pattern-directed to isotropic dewetting transition in polymer films on micropatterned surfaces with differential surface energy contrast

January 27, 2007

Author(s)

D Julthongpiput, Wenhua Zhang, Jack F. Douglas, Alamgir Karim, Michael J. Fasolka

Surface chemical patterns can both cause and direct dewetting in overlying thin films. However, a key factor in this behavior, the magnitude of surface energy...

Contact Mechanics of Layered Elastic Materials: Experiment and Theory

January 26, 2007

Author(s)

P M. McGuiggan, Jay S. Wallace, Douglas T. Smith, I Sridhar, Z Zheng, K L. Johnson

This paper reports an experimental and theoretical investigation of the indentation of a layered elastic solid, with special reference to the surface force...

Light Force in Ultracold Photoassociation

January 26, 2007

Author(s)

Eduardo Gomez, A T. Black, Lincoln Turner, Eite Tiesinga, Paul D. Lett

We study the time-resolved photoassociation of ultracold sodium in an optical dipole trap. The photoassociation laser excites pairs of atoms to molecular states...

Leakage Effects in Microwave Power Measurements

January 26, 2007

Author(s)

Ronald A. Ginley, Denis X. LeGolvan, Ann F. Monke

Because microwave power measurements are used to support almost every segment of the microwave electronics industry, the accuracy of these measurements is...

Experimental approaches for the study and application of supercritical fluids

January 25, 2007

Author(s)

Thomas J. Bruno

The design of any process involving supercritical fluids requires some degree of knowledge about the thermophysical and chemical properties of the solvents...

NIST 4. Thermophysical Properties of Hydrocarbon Mixtures Database: Version 3.0

January 24, 2007

Author(s)

Marcia L. Huber

SUPERTRAPP version 3.0 is an interactive computer program for predicting thermodynamic and transport properties of pure fluids and fluid mixtures containing up...

Optimal Quantum Measurements of Expectation Values of Observables

January 24, 2007

Author(s)

Emanuel Knill, Gerardo Ortiz, Rolando Somma

Experimental characterizations of a quantum system involve the measurement of expectation values of observables for a preparable state |f> of the quantum system...

A High-Throughput Thermoelectric Power-Factor Screening Tool for Rapid Construction of Thermoelectric Property Diagrams

January 23, 2007

Author(s)

Makoto Otani, Nathan Lowhorn, Peter K. Schenck, Winnie K. Wong-Ng, Martin L. Green, K Itaka, H Koinuma

We have developed a high throughput screening tool that maps out thermoelectric power factors of combinatorial composition-spread film libraries. The screening...

Direct Measurement of Cantilever Spring Constants and Correction of Cantilever Irregularities Using an Instrumented Indenter

January 22, 2007

Author(s)

Z C. Ying, Mark Reitsma, Richard S. Gates

A method is presented that allows direct measurement of a wide range of spring constants of cantilevers using an indentation instrument with an integrated...

Influence of Oxygen Vacancies on the Dielectric Properties of Hafnia

January 22, 2007

Author(s)

Eric J. Cockayne

First-principles calculations were used to study the effects of neutral and 2+ charged oxygen vacancies on the dielectric properties of crystalline HfO2. In...

Design and Spectroscopic Reflectometry Characterization of Pulsed Laser Deposition Combinatorial Libraries

January 22, 2007

Author(s)

Peter K. Schenck, Nabil Bassim, Makoto Otani, Hiroyuki Oguchi, Martin L. Green

The goal of the design of pulsed laser deposition (PLD) combinatorial library films is to optimize the compositional coverage of the films while maintaining a...

Diameter Dependent Transport Properties of GaN Nanowire Field Effect Transistors

January 22, 2007

Author(s)

Abhishek Motayed, Mark D. Vaudin, A V. Davydov, J Meingalilis, Maoqi He, S. N. Mohammad

Experimental Densities, Vapor Pressures, and Critical Point, and a Fundamental Equation of State for Dimethyl Ether

January 22, 2007

Author(s)

E. Christian Ihmels, Eric Lemmon

Densities, vapor pressures, and the critical point were measured for dimethyl ether, thus filling several gaps in the thermodynamic data for this compound...

Introduction to Journal of Modern Optics Special Issue on Single Photon: Sources, Detectors, Applications and Measurement Methods

January 20, 2007

Author(s)

J Cheung, Alan L. Migdall, Stefania Castelletto

In October 2005, a 2-day follow up workshop, Single photon: sources, detectors, applications and measurement methods, was held at the NPL (National Physical...

Calibrating Photon-Counting Detectors to High Accuracy: Background and Deadtime Issues

January 20, 2007

Author(s)

Michael Ware, Alan L. Migdall, Joshua Bienfang, Sergey Polyakov

When photon-counting detectors are calibrated in the presence of a background signal, deadtime effects can be significant and must be carefully accounted for to...

Reduced Deadtime and Higher Rate Photon-Counting Detection Using a Multiplexed Detector Array

January 20, 2007

Author(s)

Stefania Castelletto, Ivo P. Degiovanni, V Schettini, Alan L. Migdall

We present a scheme for a photon-counting detection system that can be operated at incident photon rates higher than otherwise possible by suppressing the...

Phase Field Theory of Heterogeneous Crystal Nucleation

January 19, 2007

Author(s)

L Granasy, T Pusztai, D M. Saylor, James A. Warren

A phase field approach is developed to model wetting and heterogeneous crystal nucleation of an undercooled pure liquid in contact with a sharp wall. We discuss...

Origins of switching field distributions in perpendicular magnetic nanodot arrays

January 19, 2007

Author(s)

Justin Shaw, William Rippard, Stephen E. Russek, Tim Reith, Charles M. Falco

We studied the reversal properties of perpendicularly magnetized Co/Pd nanodots from 100 to 50 nm in diameter fabricated using electron beam lithography...

Detection of trace water vapor in high purity phosphine using cavity ring-down spectroscopy

January 18, 2007

Author(s)

H. H. Funke, Mark W. Raynor, Kristine A. Bertness, Yu-Hsuan Chen

The presence of trace water vapor in process gases such as phosphine, used for compound semiconductor epitaxial growth, can negatively affect the optical and...

Charge Offset Stability in Tunable-Barrier Si SET Devices

January 17, 2007

Author(s)

Neil M. Zimmerman, Brian Simonds, Mikio Fujiwara, Yukinori Ono, Yasuo Takahashi, Hiroshi Inokawa

The problem of charge offset drift in single-electron tunneling devices, based on the Coulomb blockade, can preclude their useful application in metrology and...

Synthesis and Structural Characterization of Glucopyranosylamide Films on Gold

January 16, 2007

Author(s)

Mridula Kadalbajoo, J J. Park, A Opdahl, Hiromi Suda, Kitchens A. C, Jayne C. Garno, J Batteas, Michael J. Tarlov, Phillip DeShong

Stereoselective synthesis of a- and b-linked glucopyranosylamide derivatives via the in situ generation of glucosyl isoxazolines has been performed utilizing a...

Analysis of C-S-H Gel and Cement Paste by Small-Angle Neutron Scattering

January 16, 2007

Author(s)

Andrew J. Allen, J Thomas

The role of small-angle x-ray and neutron scattering (SAXS and SANS) in the characterization of cement is briefly reviewed. The unique information obtainable...

Composition and Density of Amorphous Calcium-Silicate-Hydrate in Cement

January 16, 2007

Author(s)

Andrew J. Allen, J Thomas, Hamlin M. Jennings

Despite intensive research for over a century, the main binding reaction product of cement hydration, calcium-silicate-hydrate (C-S-H) gel, is not fully...

Measuring Molecular Order in Poly(3-alkylthiophene) Thin Films with Polarizing Spectroscopies

January 16, 2007

Author(s)

Marc Gurau, Dean DeLongchamp, Brandon M. Vogel, Eric K. Lin, Daniel A. Fischer, S Sambasivan, Lee J. Richter

We measured the molecular order of poly(3-alkylthiophene) chains in thin films before and after melting through the combination of several polarized photon...

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