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 25351 - 25375 of 73697

Robust Iris Recognition Baseline for the Occular Challenge

January 20, 2011
Author(s)
Yooyoung Lee, Ross J. Micheals, James J. Filliben, P J. Phillips
Due to its distinctiveness, the human iris is a popular biometric feature used to identity a person with high accuracy. The Grand Challenge in iris recognition is to have an effective algorithm for subject verification or identification under a broad range

Tranmission Electron Microscopy with a Liquid Flow Cell

January 20, 2011
Author(s)
Kate L. Klein, Ian M. Anderson, N. de Jonge
The imaging of microscopic structures at nanometer-scale spatial resolution in a liquid environment is of interest for a wide range of studies. Transmission electron microscopy (TEM) provides a method for imaging with the requisite spatial resolution, but

A Prototype of Modeling and Simulation for Sustainable Machining

January 19, 2011
Author(s)
Guodong Shao, Eric Chernow, Deogratias Kibira, Kevin W. Lyons
Modeling and simulation techniques have frequently been utilized to analyze manufacturing processes. The simulation of Numerically Controlled (NC) machine tools is preferred to real machine testing of the programs due to the potential savings of time and

Diffraction study of the retained austenite content in TRIP steels

January 19, 2011
Author(s)
Thomas H. Gnaupel-Herold, Adam Abel Creuziger
The results of a study of using neutron diffraction for determining the retained austenite content of TRIP steels are presented. The study covers a wide area of materials, deformation modes (uniaxial, biaxial and plane strain), strains, and the retained

NMR Characterization of the Formation Kinetics and Structure of Di-O-Benzylidene Sorbitol Gels Self-Assembled in Organic Solvents

January 19, 2011
Author(s)
David L. VanderHart, Jack F. Douglas, Steven Hudson, Joseph M. Antonucci, Elizabeth A. Wilder
The molecule 1,3:2,4-Di-O-Benzylidene sorbitol (DBS) is a common gelator that forms thermally reversible gels in diverse organic solvents. Solid state 13C and proton NMR techniques, along with electron microscopy, are utilized in an exploratory study of

Towards a Methodology for Analyzing Sustainability Standards using the Zachman Framework

January 19, 2011
Author(s)
Sudarsan Rachuri, Prabir Sarkar, Anantha Narayanan Narayanan, Jae H. Lee, Paul Witherell
There exists a multitude of standards and regulations related to sustainability. It is critical to enable users to identify applicable standards across entire lifecycles of products, processes, and services. To synthesize this variety of standards, it is

Controlled in situ Nanocavitation in Polymeric Materials

January 18, 2011
Author(s)
Yajun Cheng, Joseph M. Antonucci, Steven Hudson, Nancy Lin, Xinran Zhang, Sheng Lin-Gibson
A new strategy to produce polymer-inorganic composites with ultra low volume shrinkage has been developed. Small amount of cavitation agent, acetone dicarboxylic acid (ADCA), was introduced into acrylate-glass composites and decomposed in situ to carbon

Microfluidics Measurements of Interfacial Rheology

January 18, 2011
Author(s)
Jeffrey D. Martin, Joie N. Marhefka, Kalman D. Migler, Steven D. Hudson
The bulk properties and structural characteristics of emulsions arise substantially from their interfacial rheology, which depends strongly on surfactant mass transfer and its coupling to flow. Typical methods used to measure such properties often employ

Experimental realization of a low-noise heralded single photon source

January 17, 2011
Author(s)
Alan L. Migdall, Sergey V. Polyakov, Marco Genovese, Fabrizio Piacentini, I. Ruo Berchera, Ivo P. Degiovanni, Giorgio Brida
We present a heralded single-photon source with a much lower level of unwanted background photons in the output channel by using the herald photon to control a shutter in the heralded channel. The shutter is implemented using a simple field programmable

Far Infrared Characterization of Single and Double Walled Carbon Nanotubes

January 17, 2011
Author(s)
Shin G. Chou, Zeeshan Ahmed, Georgy Samsonidze, Jing Kong, Mildred Dresselhaus
Variable temperature high resolution far infrared absorption measurements were carried out for single walled carbon nanotubes samples with different diameter distributions. At a temperature where kBT is significantly lower than the phonon energy, the broad

Simulation of lattice strain due to CNT-metal interface

January 17, 2011
Author(s)
Alexander Y. Smolyanitsky, Vinod K. Tewary
We report an atomistic molecular statics study of strains in single wall carbon nanotubes (SWCNTs) interfaced with a planar nickel surface. We calculate axial and radial strain distributions along the SWCNT axis. We demonstrate strains of up to 2%

Methylmercury photodegradation influenced by sea ice cover in Arctic marine ecosystems

January 16, 2011
Author(s)
David Point, J E. Sonke, Russell D. Day, David G. Roseneau, Keith A. Hobson, Stacy Schuur, Amanda Moors, Rebecca Pugh, Olivier F. Donard, Paul R. Becker
Despite two decades of research on mercury in northern environments, we do not fully understand the high levels of this pollutant in Arctic Biota. The presumption that global anthropogenic mercury emissions and Arctic atmospheric mercury depletion events

Equations of State on Demand: Application for Surrogate Fuel Development

January 15, 2011
Author(s)
Marcia L. Huber, Thomas J. Bruno, Robert D. Chirico, Vladimir Diky, Andrei F. Kazakov, Eric W. Lemmon, Chris D. Muzny, Michael D. Frenkel
The NIST ThermoData Engine (TDE) is a large electronic database containing experimental data with detailed descriptions of relevant metadata and uncertainties that incorporates expert- system software to automatically generate dynamically evaluated data

Electron Vortex Beams with High Quanta of Orbital Angular Momentum

January 14, 2011
Author(s)
Benjamin James McMorran, Amit K. Agrawal, Ian M. Anderson, Andrew A. Herzing, Henri J. Lezec, Jabez J. McClelland, John Unguris
Analogous to vortices in light optical beams, electron optical beams with helical wavefronts carry orbital angular momentum and promise new capabilities for electron microscopy and other applications. We use nanofabricated diffraction holograms in an

Calibration and uncertainty assessment for certified reference gas mixtures

January 13, 2011
Author(s)
Franklin R. Guenther, Antonio M. Possolo
The method to build an analysis function described in ISO 6143, Gas analysis - Comprarison methods for determining and checking the composition of calibration gas mixtures, is extended to recognize the typically small number of instrumental readings

Design of the NIST 10V programmable Josephson voltage standard system

January 13, 2011
Author(s)
Charles J. Burroughs, Paul Dresselhaus, Alain Rufenacht, David I. Olaya, Mike Elsbury, Yi-hua D. Tang, Samuel Benz
NIST has developed and implemented a new Programmable Josephson Voltage Standard (PJVS) that operates at 10 V. This next-generation system is optimized for both dc metrology and stepwise-approximated ac voltage measurements for frequencies up to a few
Displaying 25351 - 25375 of 73697
Was this page helpful?