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Search Publications

NIST Authors in Bold

Displaying 28326 - 28350 of 73697

Extension of the NIST tristimulus colorimeter for solid-state light source measurements

May 29, 2009
Author(s)
George P. Eppeldauer, Carl C. Miller, Thomas C. Larason, Yoshihiro Ohno
In order to obtain improved color measurement uncertainties for solid state light (SSL) sources, the second generation tristimulus colorimeter of NIST has been extended with a fifth channel to perform efficient matrix corrections for the spectral mismatch

Generating and Using Data of Higher Dimension for Gas-Phase Chemical Sensing

May 29, 2009
Author(s)
Baranidharan Raman, Joshua L. Hertz, Kurt D. Benkstein, Douglas C. Meier, Casey Mungle, Stephen Semancik
Methods to acquire and analyze rich data streams from sensors are helpful, if not required, to track chemical components within complex gas-phase environments. We describe a MEMS-based microsensor technology that populates multi-element arrays with

NIST SPECTRALLY TUNABLE LIGHTING FACILITY FOR COLOR RENDERING AND LIGHTING EXPERIMENTS

May 29, 2009
Author(s)
Carl C. Miller, Yoshihiro Ohno, Wendy L. Davis, Yuqin Zong, Kevin Dowling
The National Institute of Standards and Technology has developed a spectrally tunable lighting facility to allow state-of-the-art vision experiments on color rendering and lighting. The facility is composed of two cubicles, each lit by a spectrally tunable

Proceedings of the Dynamic Measurement and Control for Autonomous Manufacturing Workshop

May 29, 2009
Author(s)
Tsai H. Hong, Roger D. Eastman, Roger V. Bostelman, Hui-Min Huang, B. McMorris
The Dynamic Measurement workshop was held on October 10 - 11, 2007 at the Columbia Graduate Center of Loyola College in Maryland. Forty-eight people attended the one-day-and-a-half event which was moderated by Roger Bostelman and Tsai Hong of National

Standardization Activities for Solid State Lighting in the USA

May 29, 2009
Author(s)
Yoshihiro Ohno
In support of the U.S. Department Energy s Energy Star program for solid state lighting, a series of standards for solid state lighting products have been developed in the USA. The standards published related to measurement and color include ANSI-NEMA

Third- and fourth-order coherences measured with a multi-element superconducting nanowire single-photon detector

May 29, 2009
Author(s)
Martin J. Stevens, Burm Baek, Eric Dauler, Andrew J. Kerman, Richard J. Molnar, Scott A. Hamilton, Karl Berggren, Richard P. Mirin, Sae Woo Nam
We demonstrate a technique for measuring third- and fourth-order coherences using a multi-element detector consisting of four independent, interleaved superconducting nanowire single-photon detectors, and observe strong bunching from a chaotic light source

High Speed Quantum Key Distribution over Optical Fiber Network System

May 28, 2009
Author(s)
Xiao Tang, Lijun Ma, Alan Mink
NIST has developed a number of complete fiber-based high-speed quantum key distribution QKD)systems that includes an 850 nm QKD system for a local area network (LAN), a 1310 nm QKD system for a metropolitan area network (MAN), and a 3-node quantum network

The TRECVid 2008 BBC Rushes Summarization Evaluation

May 28, 2009
Author(s)
Paul D. Over, Alan Smeaton, George M. Awad
This paper describes an evaluation of automatic video summarization systems run on rushes from several BBC dramatic series. It was carried out under the auspices of the TREC Video Retrieval Evaluation (TRECVid) as a followup to the 2007 video summarization

Time and Frequency-Domain Spectroscopy with Dual Frequency Combs

May 28, 2009
Author(s)
Nathan R. Newbury, Ian R. Coddington, William C. Swann
High-resolution spectroscopic measurements of the amplitude and phase spectra from a gas sample can be acquired by use of dual frequency combs. Here we discuss the corresponding gas signature in the time domain.

Topological Insulators and Metals in Atomic Optical Lattices

May 28, 2009
Author(s)
Tudor Stanescu, Victor Galitski, Jay Vaishnav, Charles W. Clark, Sankar Das Sarma
We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal lattice in the presence of a light-induced periodic vector potential, which

Understanding Insecure IT: Practical Risk Assessment

May 27, 2009
Author(s)
Simon Liu, D. Richard Kuhn, Hart Rossman
IT systems have long been at risk from vulnerable software, malicious actions, or inadvertent user errors, in addition to run-of-the-mill natural and human-made disasters. As we discussed in the last issue ( Surviving Insecure IT: Effective Patch

Comparison of Clinical Methods with Isotope Dilution ICP-MS for the New Standard Reference Material 955c Lead In Caprine Blood

May 26, 2009
Author(s)
Karen E. Murphy, Thomas W. Vetter, Gregory C. Turk, Christopher D. Palmer, Miles E. Lewis, Ciaran M. Geraghty, Patrick J. Parsons, William F. Guthrie
The National Institute of Standards and Technology (NIST) has developed Standard Reference Material (SRM) 955c, a new caprine-based, four-level blood standard with certified blood lead levels (BLLs) ranging from 0.4 µg/dL (0.02 µmol/L) Pb to 45 µg/dL (2.17

Packaging and interconnect technologies for GaN nanowire-based light emitting diodes

May 26, 2009
Author(s)
Norman A. Sanford, Myongjai Lee, Jen-Hau Cheng, Dragos Seghete, Steven M. George, John B. Schlager, Kristine A. Bertness
GaN nanowires grown along c-axis on a silicon substrate using molecular beam epitaxy have been identified as one of the best materials for future light emitting diodes (LEDs). These defectfree nanowires-based LEDs may reach the highest possible efficiency

A deep-UV optical frequency comb at 205 nm

May 25, 2009
Author(s)
Scott A. Diddams, E Peters, P Fendel, S Reinhardt, T W. Hansch, T Udem
By frequency quadrupling a picosecond pulse train from a Ti:sapphire laser at 820 nm we generate a frequency comb at 205 nm with nearly bandwidth-limited pulses. The nonlinear frequency conversion is accomplished by two successive frequency doubling stages

Absolute Ranging Using Frequency Combs

May 25, 2009
Author(s)
William C. Swann, Ian R. Coddington, Nathan R. Newbury
We present a technique for measuring absolute range that uses two mismatched frequency combs to measure distance over 1.5 m range with 10 nm level statistical uncertainty.

Carbon Nanomaterials Standards Efforts at NIST

May 24, 2009
Author(s)
Jeffrey A. Fagan
Development of carbon nano-materials for applications has been hindered to date by a lack of standard protocols, i.e. documentary standards, and physical standards such as reference materials, which enable the common inter-comparison between laboratories

Optimization of Accurate SEM Imaging by Use of Artificial Images

May 22, 2009
Author(s)
Petr Cizmar, Andras Vladar, Michael T. Postek
Today the vast majority of the scanning electron microscopes (SEMs) are incapable of taking repeatable and accurate images at high magnifications. Geometric distortions are common, so are drift, vibration, and problems related to disturbing electro

Capillary Instability in Nanoimprinted Polymer Films

May 21, 2009
Author(s)
Kyle J. Alvine, Yifu Ding, Hyun Wook Ro, Brian C. Okerberg, Alamgir Karim, Christopher L. Soles, Jack F. Douglas
Capillary forces play an active role in defining the equilibrium structure of nanoscale structures. This effect can be especially pronounced in soft materials such as polymers near or above their glass transition temperatures where material flow is

Direct Imaging of Current Driven Domain Walls in Ferromagnetic Nanostripes

May 21, 2009
Author(s)
Willard C. Uhlig, Michael J. Donahue, Daniel T. Pierce, John Unguris
To better understand the response of domain walls to current induced spin transfer torques, we have directly imaged the internal magnetic structure of domain walls in current-carrying ferromagnetic nanostripes. Domain wall images were acquired both while a
Displaying 28326 - 28350 of 73697
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