U.S. flag

An official website of the United States government

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.

Search Publications

NIST Authors in Bold

Displaying 33951 - 33975 of 74372

Quantum key distribution at 1550 nm with twin superconducting single-photon detectors

December 15, 2006
Author(s)
Robert Hadfield, Jonathan L. Habif, John Schlafer, Robert E. Schwall, Sae Woo Nam
The authors report on the full implementation of a superconducting detector technology in a fiber-based quantum key distribution (QKD) link. Nanowire-based superconducting single-photon detectors (SSPDs) offer single-photon detection with low dark counts

Office of Microelectronics Programs (Programs, Activities and Accomplishments)

December 14, 2006
Author(s)
Stephen Knight, Joaquin (. Martinez, Michele L. Buckley
The microelectronics industry supplies vital components to the electronics industry and to the U.S. economy, enabling rapid improvements in productivity and in new high technology growth industries such as electronic commerce and biotechnology. The

Photocurable Oil/Water Interfaces as a Universal Platform for 2-D Self-Assembly

December 14, 2006
Author(s)
Jason Benkoski, Ronald L. Jones, Jack F. Douglas, Alamgir Karim
We present a novel platform for the creation of 2-D assemblies from nanoscale building blocks. The system consists of an oil/water interface in which the oil phase can be flash-cured upon UV exposure. The photopolymerizable material, 1,12-dodecanediol

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
Displaying 33951 - 33975 of 74372
Was this page helpful?