Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Journals

GaN nanowire carrier concentration calculated from light and dark resistance measurements

January 30, 2009

Author(s)

Lorelle Mansfield, Kristine A. Bertness, Paul T. Blanchard, Todd E. Harvey, Aric W. Sanders, Norman A. Sanford

We obtained limits on the carrier concentration and mobility of silicon-doped gallium nitride nanowires at room temperature with light and dark resistance data

Low-noise synthesis of microwave and millimeter wave signals with optical frequency comb generator

January 29, 2009

Author(s)

Shijun Xiao, Leo Hollberg, Scott A. Diddams

We analyze the phase noise of the 20 GHz sub-picosecond optical pulse train generated by an optical frequency comb generator. The 10 fs for Fourier frequencies

Analysis of 3D elemental mapping artifacts in biological specimens using Monte Carlo simulation

January 29, 2009

Author(s)

Keana C. Scott, Nicholas W. Ritchie

In this paper, we present the Monte Carlo simulation results demonstrating the feasibility of the focused ion beam based X-ray microanalysis technique (FIB-EDS)

Broadband Dielectric Spectroscopy of Ruddlesden-Popper Sr(n+1)Ti(n)O(3n+1) (n= 1, 2, 3) Thin Films

January 29, 2009

Author(s)

Nathan D. Orloff, Ichiro Takeuchi, James C. Booth, Dazhen Gu, Jordi Mateu, C. J. Fennie, K. M. Rabe, W Tian, D.G. Schlom

We explore the frequency dependent permittivity of Ruddlesden-Popper series Sr(n+1)Ti(n)O(3n+1) (n= 1, 2, 3) thin films as a function of temperature and dc

Computer-Based Monitoring for Decision Support Systems and Disaster Preparedness in Buildings

January 29, 2009

Author(s)

Alan B. Vinh

The operation of modern buildings can support a vast amount of static and real-time data. Static information such as building schematics is vital for security

Advancing Automated Demand Response Technology

January 28, 2009

Author(s)

Steven T. Bushby, David G. Holmberg

For several years electric utilities have implemented a wide variety of programs to curtail load in times of stress on the electricity distribution grid or on

Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-Temperature La 2 − x Sr x CuO 4 Superconductors

January 27, 2009

Author(s)

M. Kofu, S.-H. Lee, M Fujita, Hye J. Kang, H. Eisaki, K Yamada

Low-energy spin excitations were investigated in the static stripe phase of La2−xSrxCuO4 sing elastic and inelastic neutron scattering on single crystals. For x

Structure and Degeneracy of Vortex Lattice Domains in Pure Superconducting Niobium: A Small-Angle Neutron Scattering Study

January 27, 2009

Author(s)

Mark Laver, E M. Forgan, C Bowell, C D. Dewhurst, S Ramos, A B. Abrahamsen, D. K. Christen, D Fort, S Muhlbauer, J Kohlbrecher, R Cubitt

High-purity niobium exhibits a surprisingly rich assortment of vortex lattice (VL) structures for fields applied parallel to a fourfold symmetry axis, with all

Density and Speed of Sound Measurements of Jet A and S-8 Aviation Turbine Fuels

January 27, 2009

Author(s)

Stephanie L. Outcalt, Arno R. Laesecke, Malte B. Freund

The density and speed of sound were measured for three compositions of aviation jet fuel A, and a synthetic fuel (S-8) derived from the Fischer-Tropsch process

3:1 Magnetization Plateau and Suppression of Ferroelectric Polarization in an Ising Chain Multiferroic

January 26, 2009

Author(s)

Y.-J. Jo, Seoungsu Lee, E. Choi, H. Yi, William D. Ratcliff, Y. Choi, V. Kiryukhin, S.-W. Cheong, L. Balicas

Ferroelectric Ising chain magnet Ca3Co2−xMnxO6 (x≃0.96) was studied in magnetic fields of up to 33 T. Magnetization and neutron-scattering measurements reveal

Origin and Tuning of the Magnetocaloric Effect in the Magnetic Refrigerant Mn1.1Fe0.9(P0.8Ge0.2)

January 26, 2009

Author(s)

Danmin Liu, Ming Yue, Jiuxing Zhang, T. M. McQueen, Jeffrey Lynn, Xiaolu Wang, Ying Chen, Jiying Li, R. J. Cava, X. Liu, Zaven Altounian, Qingzhen Huang

Neutron-diffraction and magnetization measurements have been carried out on a series of samples of the magnetorefrigerant Mn1+yFe1−yP1−xGex. The data reveal

Magnetization and Superconducting Quantum Interference Device detected Electron Paramagnetic Resonance (SQUID-EPR) of the FIN Trityl Radical

January 24, 2009

Author(s)

Brant Cage, James H. McNeely, Howard J. Halpern, Stephen E. Russek

The Finland trityl paramagnet is characterized by magnetic susceptibility and a new form of quantitative electron paramagnetic resonance (EPR) that utilizes a

Global Information Systems in Science: Application to the Field of Thermodynamics

January 22, 2009

Author(s)

Michael D. Frenkel

Global Information Systems can be defined as information systems designed to collect, process, integrate, evaluate, and communicate the entire body of knowledge

Nuclear quadrupole resonances in compact vapor cells: The crossover between the NMR and the nuclear quadrupole resonance interaction regimes

January 22, 2009

Author(s)

Elizabeth A. Donley, Jonathan Long, Tara C. Liebisch, Eleanor Hodby, Ted Fisher, John E. Kitching

We trace the transformation of I = 3/2 131-Xe nuclear spin resonances from the pure nuclear quadrupole regime to the quadrupole-perturbed Zeeman regime. We

Local Bounds on Effective Hamiltonians for Stabilizer Codes

January 22, 2009

Author(s)

Stephen Bullock, Dianne M. O'Leary

This paper introduces various notion of k-locality of stabilizer codes inherited from the associated stabilizer groups. A choice of generators for the group

Simple Connections in Alkali Adsorption

January 21, 2009

Author(s)

John William Gadzuk

Stimulated by recent two-photon photoemission spectroscopy and density functional theory (DFT) studies by Petek and coworkers, a retrospective look at some

Thermal Decomposition Kinetics of Propylcyclohexane

January 21, 2009

Author(s)

Jason A. Widegren, Thomas J. Bruno

As part of a large-scale thermophysical property measurement project, the decomposition kinetics of propylcyclohexane was investigated. Decomposition reactions

Introducing "Insecure IT"

January 20, 2009

Author(s)

David R. Kuhn, Hart Rossman, Simon Liu

This article introduces a new department for IT Professional that will cover security in IT systems, ranging from desktops to global e-commerce networks. Our

Pb(II) Adsorption on Isostructural Hydrated Alumina and Hematite (0001) Sur faces: A DFT Study

January 20, 2009

Author(s)

Sara E. Mason, Christopher R. Iceman, Kunaljeet Tanwar, Thomas P. Trainor, Anne M. Chaka

The persistence of lead (Pb) in contaminated topsoil is ranked as one of the most serious environmental issues in the U.S. and other countries. Adsorption of Pb

Design and fabrication of a micromachined multi-spectral magnetic resonance imaging agent

January 20, 2009

Author(s)

Gary Zabow, Alan P. Koretsky, John M. Moreland

This paper describes the fabrication details of magnetic nano- and microstructures that enable a new class of multispectral magnetic resonance imaging agents

Predicting Failure in Mammalian Enamel

January 16, 2009

Author(s)

Brian R. Lawn, James J. Lee, Paul Constantino, Peter Lucas

Dentition is a vital element of human and animal function, yet there is little fundamental knowledge about how tooth enamel endures under stringent oral

Creating a supersolid in one-dimensional Bose mixtures

January 15, 2009

Author(s)

Ludwig G. Mathey, Ippei Danshita, Charles W. Clark

We identify a one-dimensional supersolid phase in a binary mixture of near-hardcore bosons with weak, local interspecies repulsion. We find realistic conditions

Black optical coating for high-power laser measurements from carbon nanotubes and silicate

January 15, 2009

Author(s)

Christopher L. Cromer, Katie Hurst, Xiaoyu X. Li, John H. Lehman

We describe a coating based on potassium silicate, commonly known as water glass, and multiwall carbon nanotubes. The coating has a high absorbance (0.96 at

Living Anionic Polymerization Using a Microfluidic Reactor

January 15, 2009

Author(s)

Thomas Q. Chastek, Kazunori Iida, Eric J. Amis, Michael J. Fasolka, Kathryn L. Beers, Jae H. Chun

Living anionic polymerizations were conducted within aluminum-polyimide microfluidic devices. Polymerizations of styrene in cyclohexane were carried out at

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009

Author(s)

William C. Griffith, Svenja A. Knappe, John E. Kitching, Ricardo Jimenez Martinez, Vishal Shah

High permeability magnetic flux concentrators are used to enhance the sensitivity of an atomic magnetometer operating in the spin exchange relaxation free

Capillary Rise between Planar Surfaces

January 14, 2009

Author(s)

Jeffrey W. Bullard, Edward J. Garboczi

Minimization of free energy is used to calculate the equilibrium verticalrise and mensicus shape of a liquid column between two closelyspaced, parallel planar

Equilibrium Electrostatics of Responsive Polyelectrolyte Monolayers

January 14, 2009

Author(s)

Rebecca A. Zangmeister, Rastislav Levicky, Kang Wang

The physical behavior of polyelectrolytes at solid-liquid interfaces presents challenges both in measurement and in interpretation. An informative, yet often

Round-Robin Studies of Two Potential Seebeck Coefficient Standard Reference Materials

January 14, 2009

Author(s)

Nathan Lowhorn, Winnie K. Wong-Ng, Weiping Zhang, John Lu, Makoto Otani, Evan L. Thomas, Martin L. Green, Thanh Tran

The scientific activities of NIST include the development and distribution of standard reference materials (SRM) for instrument calibration and inter-laboratory

Miniature atomic magnetometer integrated with flux concentrators

January 14, 2009

Author(s)

William C. Griffith, Ricardo Jimenez Martinez, Vishal Shah, Svenja A. Knappe, John E. Kitching

A major limitation on the sensitivity of alkali atomic magnetometers, spin-exchange relaxation, can be completely eliminated by operating at low magnetic field

400-Fold Reduction in Saturation Field by Interlayering

January 13, 2009

Author(s)

William F. Egelhoff Jr., John E. Bonevich, Philip Pong, John Unguris, Robert D. McMichael, Gery R. Stafford, Carlos R. Beauchamp

The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable saturation fields that can convert