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NIST Authors in Bold

Displaying 33626 - 33650 of 74024

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

Analysis of potential cancer biomarkers in mitochondrial DNA

December 1, 2006
Author(s)
J P. Jakupciak, G. D. Dakubo, Samantha D. Maragh, R. L. Parr
Understanding mitochondrial biology is a fundamental research goal in human genetics and medicine. The use of mitochondria to serve as a biomarker is rapidly expanding in disciplines ranging from cancer, rare metabolic diseases, aging, the tracing of human

Compensation of Random and Systematic Timing Errors in Sampling Oscilloscopes

December 1, 2006
Author(s)
Paul D. Hale, C. M. Wang, Dylan Williams, Kate Remley, Joshua Wepman
In this paper, a method of correcting both random and systematic timebase errors using measurements of only two quadrature sinusoids made simultaneously with a waveform of interest is described. The authors estimate the fundamental limits to the procedure
Displaying 33626 - 33650 of 74024
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