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Search Publications

NIST Authors in Bold

Displaying 32526 - 32550 of 73830

Single Molecule Mass Spectrometry in Solution Using a Solitary Nanopore

May 15, 2007
Author(s)
Joseph W. Robertson, Claudio G. Rodrigues, Oleg V. Krasilnikov, Vincent M. Stanford, Kenneth A. Rubinson, John J. Kasianowicz
A solitary protein nanometer-scale pore provides the basis for single molecule mass spectrometry in solution. Individual poly(ethylene glycol) molecules of different mass that enter a nanopore cause distinct and statistically resolved conductance states

Access Control Policy Combinations for the Grid Using the Policy Machine

May 14, 2007
Author(s)
Vincent C. Hu, David F. Ferraiolo, Karen A. Scarfone
Many researchers have tackled the architecture and requirements aspects of grid security, concentrating on the authentication or authorization mediation instead of authorization techniques, especially the topic of policy combination. Policy combination is

Development of Surgical Lighting for Enhanced Color Contrast

May 14, 2007
Author(s)
Maritoni A. Litorja, Steven W. Brown, Maria E. Nadal, David W. Allen, Alexander Gorbach
The National Institute of Standards and Technology and the National Institutes of Health have started a collaborative study on the development of lighting that will provide enhanced, specific to various tissues, contrast with respect to its surroundings

Microfabricated Laser Saturated Absorption Spectrometer

May 14, 2007
Author(s)
Svenja A. Knappe, Hugh Robinson, Leo W. Hollberg
We demonstrate a miniature microfabricated laser saturated absorption spectrometer. The system consists of miniature optics, a microfabricated Rb vapor cell, heaters, and a photodetector, all contained within a volume of 0.1 cm 3. Saturated absorption

Utility Assessments of Soldier-Worn Sensor Systems for ASSIST

May 14, 2007
Author(s)
Michelle P. Steves
Utility assessments were performed for the Defense Advanced Research Projects Agency (DARPA)Advanced Soldier Sensor Information Systems and Technology (ASSIST) program. This paper describes the field-based, formative methods used to assess utility for

Optimal Ion Trapping Experiment

May 10, 2007
Author(s)
Kevin J. Coakley
In each run of an experiment, ions are confined in a trap for duration {\tau}. After the trapping stage, ions are purged and detected. The detector provides incomplete information because it goes dead after detecting the first trapped ion. There is a dead

A 14-pixel, multiplexed array of gamma-ray microcalorimeters with 47 eV energy resolution at 103 keV

May 9, 2007
Author(s)
W.Bertrand (Randy) Doriese, Joel Ullom, James A. Beall, William Duncan, S. L. Ferreira, Gene C. Hilton, Rob Horansky, Kent D. Irwin, John Mates, Carl D. Reintsema, Leila R. Vale, Yizi Xu, Barry L. Zink, Andrew Hoover, Michael W. Rabin, Clifford R. Rudy, Duc Vo
We present a prototype for a high-energy-resolution, high-count-rate, gamma-ray spectrometer intended for nuclear forensics and international nuclear safeguards. The prototype spectrometer is an array of 14 transition-edge-sensor microcalorimeters with an

Measurement of Single Wall Nanotube Dispersion by Size Exclusion Chromatography

May 9, 2007
Author(s)
Barry J. Bauer, Matthew Becker, Vardhan Bajpai, Jeffrey A. Fagan, Erik K. Hobbie, Kalman D. Migler, Charles M. Guttman, William R. Blair
The dispersion of nanotubes in solution is necessary in order to achieve the goal of sorting and manipulating nanotubes by length and type and to then prepare high quality monodisperse samples. A necessary step is the proper characterization of the

On tuning the design of an evolutionary algorithm for machining optimization problem

May 9, 2007
Author(s)
Jean-Louis Vigouroux, Sebti Foufou, Laurent Deshayes, James J. Filliben, Lawrence A. Welsch, Alkan Donmez
In this paper, a methodology for tuning the design of an evolutionary algorithm (EA) is presented. An EA for solving machining optimization probfems having highly non-linear constraints and uncertainties is studied. A conventional turning optimization

Tensile Strength Measurements of Frangible Bullets Using the Diametral Compression Test

May 8, 2007
Author(s)
Steven P. Mates, Richard L. Rhorer, Stephen W. Banovic, Eric P. Whitenton, Richard J. Fields
Frangible bullets are designed to disintegrate on impact against rigid surfaces to avoid ricochet hazards in recreational shooting ranges or law enforcement training facilities. Their behavior against protective soft body armor is therefore quite different

Modeling and Analysis of Scatterometry Signatures for Optical Critical Dimension Reference Material Applications

May 7, 2007
Author(s)
Heather J. Patrick, Thomas A. Germer, Michael W. Cresswell, Richard A. Allen, Ronald G. Dixson, Michael R. Bishop
We use an optical critical dimension technique, matching modeled to measured scatterometry signatures, to obtain critical dimension linewidth on grating targets fabricated using the single-crystal critical dimension reference materials process. The targets

Fiber-laser frequency combs

May 6, 2007
Author(s)
Nathan R. Newbury, William C. Swann
We discuss the contributions to the linewidth and frequency noise of the individual modes of a mode-locked fiber laser. Much of this noise can be suppressed through feedback to form a stable frequency comb.

Multi-octave optical coherence spanning hundreds of meters

May 6, 2007
Author(s)
Ian R. Coddington, Luca Lorini, William C. Swann, J. C. Bergquist, Y. Le Coq, C. W. Oates, Qudsia Quraishi, Jason Stalnaker, Scott Diddams, Nathan R. Newbury
We demonstrate coherent transfer of optical signals with radian level noise (in a 3.5 MHz bandwidth) through a series of laser systems spanning from 657 nm to 1535 nm and several hundred meter distances.

Photon-number-resolving capabilities of a semiconductor quantum dot, optically gated, field-effect transistor

May 6, 2007
Author(s)
Eric Gansen, Mary A. Rowe, Marion Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard Mirin
We demonstrate the photon-number-resolving capabilities of a novel quantum dot, optically gated, field-effect transistor cooled to 4 K. Peaks are observed in the detector's response to highly attenuated laser pulses in accordance with Poisson statistics.

Residual stability of a fiber-based frequency comb

May 6, 2007
Author(s)
William C. Swann, Ian R. Coddington, Luca Lorini, Jason Stalnaker, J. C. Bergquist, Scott Diddams, Nathan R. Newbury
Abstract: We present measurements of the residual frequency stability across a fiber frequency comb by comparison through a Ti:sapphire frequency comb. We find 6 x 10 -17 stability at one second and 1 x 10 -18 at 1000 seconds.

Measurement of Complex Impedance of Individual Metallic Carbon Nanotubes

May 3, 2007
Author(s)
Jan Obrzut, Kalman D. Migler, L F. Dong, J Jiao
We describe impedance measurements of individual single wall carbon nanotubes (CNTs) in the frequency range of 40 Hz to 100 MHz. The extracted CNT capacitance of 4 10-14 F/mm, is independent of the total resistance, however the CCNT value is larger than
Displaying 32526 - 32550 of 73830
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