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 14326 - 14350 of 17285

The Decoupled Potential Integral Equation for Time-Harmonic Electromagnetic Scattering

May 28, 2015
Author(s)
Felipe Vico, Leslie Greengard, Miguel Ferrando, Zydrunas Gimbutas
We present a new formulation for the problem of electromagnetic scattering from perfect electric conductors. While our representation for the electric and magnetic fields is based on the standard vector and scalar potentials A, φ in the Lorenz gauge, we

Atomic Clock with 1x10 -18 Room-Temperature Blackbody Stark Uncertainty

December 31, 2014
Author(s)
Kyle P. Beloy, Nathan M. Hinkley, Nate B. Phillips, Jeffrey A. Sherman, Marco Schioppo, John H. Lehman, Ari D. Feldman, Leonard M. Hanssen, Christopher W. Oates, Andrew D. Ludlow
… factor limiting the performance of many atomic frequency standards, with the BBR environment inside the clock …

A CW calibrated laser pulse energy meter for the range 1 pJ to 100mJ

May 13, 2014
Author(s)
Malcolm G. White, Rodney W. Leonhardt, David J. Livigni, John H. Lehman
We describe the use of a silicon photodiode trap detector and digital storage oscilloscope as an absolute laser pulse energy meter, capable of repetition rates of 85 Hz and 5% uncertainty (k = 2). The maximum repetition rate is limited by the decay time of

Three-deminstional Hemisphere-structured LiSn_(0.0125)Mn_(1.975)O_(4) Thin-Film Cathodes

March 5, 2014
Author(s)
Haena Yim, Woo Yeon Kong, Seok-JIn Yoon, Sahn Nahm, Ho Won Jang, Yung-Eun Sung, Jong Y. Ha, Albert Davydov, Ji-Won Choi
Three-dimensional (3D) high surface area LiSn_(0.0125)Mn_(1.975)O-(4) thin film cathodes have been fabricated in order to increase a charge/discharge capacity in the Li-ion battery. Metal oxide films were deposited by RF magnetron sputtering on close

Building Better Search Engines by Measuring Search Quality

March 3, 2014
Author(s)
Ellen M. Voorhees, Paul D. Over, Ian Soboroff
Search engines help users locate particular information within large stores of content developed for human consumption. For example, users expect web search engines to direct searchers to web sites based on the content of the site rather than the site

Optical phase-noise dynamics of Titanium:sapphire optical frequency combs

January 24, 2014
Author(s)
Qudsia Quraishi, Scott A. Diddams, Leo W. Hollberg
Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise between

Cold-atom double-lambda coherent population trapping clock

October 31, 2013
Author(s)
Elizabeth A. Donley, Francois-Xavier R. Esnault, Eric M. Blanshan, Eugene N. Ivanov, Robert E. Scholten, John E. Kitching
… field applications, particularly where satellite frequency standards are not accessible. Cold-atom CPT clocks promise …

A Literature Review of Sensor Ontologies for Manufacturing Applications

October 23, 2013
Author(s)
Craig I. Schlenoff, Tsai Hong Hong, Roger D. Eastman
The purpose of this paper is to review existing sensor and sensor network ontologies to understand whether they can be reused as a basis for a manufacturing perception sensor ontology, or if the existing ontologies hold lessons for the development of a new

Flat Frequency Response in the Electronic Measurement of the Boltzmann Constant

June 1, 2013
Author(s)
Jifeng Qu, Horst Rogalla, Yang Fu, Jianqiang Zhang, Alessio Pollarolo, Samuel Benz
A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with an integration period

Metrology for Lab-on-a-Chip Final-Product Devices

May 12, 2013
Author(s)
Darwin R. Reyes-Hernandez, Michael W. Halter, Jeeseong Hwang
New metrology tools to measure the critical parameters of internal structures in lab on a chip devices are greatly needed in order to develop standard tests for this technology. Here we present a method that combines a custom made optical coherence
Displaying 14326 - 14350 of 17285
Was this page helpful?