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NIST Authors in Bold

Displaying 34101 - 34125 of 73832

The Pseudo-mitochondrial Genome Influences Mistakes in Heteroplasmy Interpretation

July 21, 2006
Author(s)
Ryan L. Parr, Jennifer Maki, Brian Reguly, Gabriel D. Dakubo, A A. Aguirre, Roy Wittock, Kerry Robinson, J P. Jakupciak, Robert E. Thayer
Nuclear mitochondrial pseudogenes (numts) are a potential source of contamination during mitochondrial DNA PCR amplification. This paper is the first to fully sequence 29 paralogous nuclear DNA fragments that represent the entire mitochondrial genome. This

Subsolidus Phase Equilibria and Properties in the Magnetic Dielectric System Bi 2 O 3 :Mn 2 O 3+x :Nb 2 O 5

July 20, 2006
Author(s)
Terrell A. Vanderah, M W. Lufaso, A U. Adler, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Mn-Nb-O system in air (750-900 C). Phases containing Mn2+, Mn3+, and Mn4+ were all observed. Ternary compound formation was limited to pyrochlore, which formed a substantial solid solution region

Semantic Web for Chemical Genomics: Need, How To, And Hurdles

July 19, 2006
Author(s)
Talapady N. Bhat
Semantic Web has been often suggested as the information technology solution to the growing problem in managing the millions of data points generated by modern science such as nanotechnology and high through-put screening for drugs. However, the progress

5th Annual PKI R&D Workshop "Making PKI Easy to Use" Proceedings

July 18, 2006
Author(s)
William T. Polk, Nelson E. Hastings, Kent Seamons
NIST hosted the fifth annual Public Key Infrastructure (PKI) Research Workshop on April 4-6, 2006. The two and a half day event brought together PKI experts from academia, industry, and government to explore the remaining challenges in deploying public key

Enhanced light extraction from circular Bragg grating coupled microcavities

July 18, 2006
Author(s)
Mark Su, Richard Mirin
A sevenfold enhancement of light extraction over a 130 nm bandwidth from a semiconductor at room temperature was achieved using circular Bragg gratings (CBGs) etched around the periphery of a vertical-cavity light-emitting structure. The CBG defined an in

Real Time Shape Evolution of Nanoimprinted Polymer Structures During Thermal Annealing

July 18, 2006
Author(s)
Ronald L. Jones, T Hu, Christopher L. Soles, Eric K. Lin, R M. Reano, Stella W. Pang, D M. Casa
The real time shape of nanoimprinted polymer patterns are measured as a function of annealing temperature and time using a new metrology technique, Critical Dimension Small Angle X-ray Scattering (CD-SAXS). Periodicity, linewidth, line height, and sidewall

Some Difficult Problems in the Modeling of Fire Spread

July 16, 2006
Author(s)
Kathryn M. Butler, Thomas J. Ohlemiller
A fire and the objects involved in the fire form a highly complex dynamic system. Important processes occur over a wide range of spatial and temporal scales, from the microscales of thermodynamics and chemical kinetics, through the mesoscales of heat

Trapped atomic ions and quantum information processing

July 16, 2006
Author(s)
David J. Wineland, Dietrich G. Leibfried, James C. Bergquist, Brad R. Blakestad, John J. Bollinger, Joseph W. Britton, J Chiaverini, Ryan Epstein, David Hume, Wayne M. Itano, John D. Jost, Emanuel H. Knill, Jeroen Koelemeij, C. Langer, R Ozeri, Rainer Reichle, Till P. Rosenband, Tobias Schaetz, Piet Schmidt, Signe Seidelin, Nobuyasu Shiga, Janus Wesenberg
The basic requirements for quantum computing and quantum simulation (Single- and multi-qubit gates, long memor times, etc.)have been demonstrated in separate experiments on trapped ions. Construction of a large-scale information processor will require

100 mV ac-dc Transfer Standard measurements with a Pulse-driven AC Josephson Voltage Standard

July 14, 2006
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus, Thomas E. Lipe, Joseph R. Kinard Jr.
In order to improve the low-voltage calibration service at NIST we have constructed an ac Josephson voltage standard system with a maximum rms output voltage of 100 mV. Using this system we synthesized sinewaves of various audio frequencies and measured ac

A single-atom optical clock with high accuracy

July 14, 2006
Author(s)
Windell Oskay, Scott A. Diddams, Elizabeth A. Donley, Tara M. Fortier, Thomas P. Heavner, Leo W. Hollberg, Wayne M. Itano, Steven R. Jefferts, M J. Jensen, Kyoungsik Kim, F Levi, Thomas E. Parker, James C. Bergquist
For the past fifty years, atomic frequency standards based on the cesium ground-state hyperfine splitting have been the most accurate timepieces in the world. One of the most accurate, current-generation, cesium standards is the NIST-F1 fountain, which has

Development of a 60 Hz Power Standard using SNS Programmable Josephson Voltage Standards

July 14, 2006
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Bryan C. Waltrip, Thomas L. Nelson, J. Williams
We are implementing a new standard for 60 Hz mains power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). Our NIST PJVS systems are based on

On-Wafer Noise-Parameter Measurements at NIST

July 14, 2006
Author(s)
James P. Randa, Dave K. Walker
NIST has developed the capability to measure noise parameters on a wafer int he 1-12.4 GHz range. In this paper we briefly describe the measurement methods and the uncertainty analysis and present results of measurements on a very poorly matched transistor

Supplementary Comparison of RF Power Measurements with 2.4 mm Connectors, CCEM.RF-S1.CL

July 14, 2006
Author(s)
Thomas P. Crowley, J Miall, J dereede, J. Furrer, A Michaud, E. Dressler, T Zhang, K. Shimaoka, J H. Kim
We present the results of a supplementary comparison in RF power measurements with 2.4 mm connectors. This is the highest frequency RF power comparison with coaxial connectors. All participant measurements agree with the reference values within their

Terahertz radiometer design for traceable noise-temperature measurements

July 14, 2006
Author(s)
Eyal Gerecht, Dazhen Gu, James P. Randa, Dave K. Walker, Robert L. Billinger
We report on design of a radiometer for traceable noise-temperature measurements at terahertz frequencies, including noise measurements on cryogenic IF components, development and test of quasi-optical adapter technology, development of black body

VARIABILITY OF CHARGE NOISE IN Al-BASED SET TRANSISTORS

July 14, 2006
Author(s)
Mark W. Keller, Blaise Jeanneret, Joe Aumentado
We measured the charge noise of four Al-based SET transistors on multiple cooldowns. We found a consistent 1/f component independent of thermal cycling and other treatments, but large variations in the total noise spectrum due to two-level fluctuators.
Displaying 34101 - 34125 of 73832
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