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Search Publications

NIST Authors in Bold

Displaying 33301 - 33325 of 73697

Nucleation conditions for catalyst-free GaN nanowires

December 8, 2006
Author(s)
Kristine A. Bertness, Alexana Roshko, Lorelle Mansfield, Todd E. Harvey, Norman Sanford
We have examined the initial steps for catalyst-free growth of GaN using molecular beam epitaxy on Si (111) substrates using AlN buffer layers. These wires form spontaneously under high N-to-Ga ratios for a growth temperature range of about 810 to 830 °C

Changes in Electronic Structure of the Electrochemically Li-Ion Deintercalated LiNiO 2 System Investigated by Soft X-Ray Absorption Spectroscopy

December 7, 2006
Author(s)
W S. Yoon, Kyung Y. Chung, James McBreen, Daniel A. Fischer, Xiao-Qing Yang
The electronic structures of Li1-xNiO2 system after electrochemically delithiated to various x values have been investigated using soft X-ray absorption spectroscopy (XAS) for oxygen K-edge and Ni LII,III-edge. By comparing the O K-edge XAS spectra of Li1

Nonparametric Analysis of Fingerprint Data on Large Data Sets

December 7, 2006
Author(s)
Jin Chu Wu, Charles Wilson
By executing different fingerprint-image matching algorithms on large data sets, it reveals that the match and non-match similarity scores have no specific underlying distribution function. Thus, it requires a nonparametric analysis for fingerprint-image

Thickness Dependence of Microstructure in Semiconducting Films of an Oligofluorene Derivative

December 7, 2006
Author(s)
Dean M. DeLongchamp, Mang-Mang Ling, Youngsuk Jung, Daniel A. Fischer, Mark Roberts, Eric K. Lin, Zhenan Bao
The measurement and optimization of microstructure development in organic semiconductor films is valuable because microstructure in many cases critically impacts electronic performance. We demonstrate a general method to measure microstructure thickness

Is There a High Energy Particle Population in the Quiet Solar Corona?

December 6, 2006
Author(s)
Yuri Ralchenko, Uri Feldman, G. A. Doschek
A study of spectra emitted by the quiet solar corona indicates that the majority of line intensities originating in low-lying levels are consistent with isothermal plasma of ~1.3 106 K. Nevertheless, a number of line intensities and in particular those

Effects of the Rooftop Environment on GPS Time Transfer

December 5, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick
We examine the effects of the rooftop environment on GPS time transfer, in particular the effects of multipath reflections from nearby metallic objects. Three different antennas sites were selected on the roof of the NIST laboratories at Boulder, Colorado

GPS Signal Integrity Dependencies on Atomic Clocks

December 5, 2006
Author(s)
Marc A. Weiss, Pradipta Shome, Ron Beard
The problem of signal integrity for GPS satellites is discussed. In particular, there is a need for characterizing peak deviation of GPS clocks from prediction. Results from a preliminary study of two GPS clocks tested on the ground show that the

Long-term Stability of NIST Chip-Scale Atomic Clock Physics Packages

December 5, 2006
Author(s)
Svenja A. Knappe, V Shah, Vladislav Gerginov, Alan Brannon, Leo W. Hollberg, John E. Kitching
We present measurements regarding the long-term frequency instability of NIST CSAC physics packages. Changes of the clock frequency are caused mainly through time-dependent light shifts by the frequency-modulated VCSEL and properties of the vapor cell. We

Measurement Science for Remote Sensing

December 5, 2006
Author(s)
K B. Gebbie
NIST s role in providing the optical radiation measurement science and standards to ensure the quality, accuracy, and comparability of our Nation s remote sensing measurements in support of climate-change research is presented. Climate research has

Time Coordination Throughout the Americas via the SIM Common-View GPS Network

December 5, 2006
Author(s)
Michael A. Lombardi, Andrew N. Novick, Jose M. Lopez, Jean-Simon Boulanger, Carlos Donado
The Sistema Interamericano de Metrologia (SIM) consists of national metrology institutes (NMIs) located in all 34 member nations of the Organization of American States (OAS), which extends throughout North, Central, and South America, and the Caribbean

A Roadmap For Metrology Interoperability

December 4, 2006
Author(s)
John A. Horst, S McSpadden
An International Metrology Interoperability Summit (IMIS) was held March 28 - 30, 2006 at NIST in Gaithersburg, MD. Workers and decision makers in a variety of dimensional metrology corporations and organizations worldwide participated. The first day

An Empirical Study of Sample Size in ROC-Curve Analysis of Fingerprint Data

December 4, 2006
Author(s)
Jin Chu Wu, Charles Wilson
The fingerprint datasets in many cases may exceed millions of samples. Thus, the needed size of a biometric evaluation test sample is an important issue in terms of both accuracy and efficiency. In this article, an empirical study, namely, using Chebyshev

Hyperspectral Image Projector for Advanced Sensor Characterization

December 4, 2006
Author(s)
Steven W. Brown, Joseph P. Rice, Jorge E. Neira, Bettye C. Johnson
In this work, we describe radiometric platforms able to produce realistic spectral distributions and spatial scenes for the development of application-specific metrics to quantify the performance of sensors and systems. Using these platforms, sensor and

Magnetic Properties of Co/GaAs(110)

December 4, 2006
Author(s)
T Monchesky, John Unguris
We observed three magnetic states of an ultrathin, atomically well-ordered Co film grown on a cleaved GaAs(110) substrate. For a Co thickness less than 3.4 monolayers (ML), we find a ferromagnetically dead layer associated with the formation of interfacial

Analysis of artificially degraded DNA using STRs and SNPs results of a collaborative European (EDNAP) exercise

December 1, 2006
Author(s)
L. A. Dixon, A. E. Dobbins, H. Pulker, John M. Butler, Peter M. Vallone, Michael D. Coble, W. Parson, B. Berger, P. Grubwieser, H. S. Mogensen, N. Morling, K. Nielsen, J. J. Sanchez, E. Petkovski, A. Carracedo, P. Sanchez-Diz, E. Ramos-Luis, M. Brion, J. A. Irwin, R. S. Just, O. Loreille, T. J. Parsons, D. Syndercombe-Court, H. Schmitter, B. Stradmann-Bellinghausen, K. Bender, P. Gill
Displaying 33301 - 33325 of 73697
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