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 30801 - 30825 of 74070

Secure Biometric Match-on-Card Feasibility Report

November 30, 2007
Author(s)
David A. Cooper, Trung-Hung Dang, Philip Lee, William I. MacGregor, Ketan Mehta
FIPS 201, "Personal Identity Verification (PIV) of Federal Employees and Contractors," and its associated special publications define a method to perform biometric match-off-card authentication of a PIV cardholder when the PIV card is inserted into a

Certification of Standard Reference Material 1476a, a Polyethylene Resin

November 29, 2007
Author(s)
Kathleen M. Flynn, S Wetzel, William R. Blair, J R. Maurey
The melt flow rate of Standard Reference Material (SRM) 1476a Branched Polyethylene Resin was determined to be 1.23g/10 min at 190 C under a load of 2.16 kg using the ASTM Method D1238-03, method A. The average results from 30 determinations yielded a

IPOG/IPOG-D: Efficient Test Generation for Multi-way Combinatorial Testing

November 29, 2007
Author(s)
Yu Lei, Raghu N. Kacker, D. Richard Kuhn, Vadim Okun, James F. Lawrence
We present two strategies for multi-way testing (i.e., t-way testing with t > 2). The first strategy generalizes an existing strategy, called In-Parameter-Order, from pairwise testing to multi-way testing. This strategy requires all t-way combinations to

Microdomain Ordering in Laterally Confined Block Copolymer Thin Films

November 29, 2007
Author(s)
August W. Bosse, Carlos Garcia-Cervera, Glenn Fredrickson
We examine the effects of small-scale, hexagonal, lateral confinement on microdomain ordering in $AB$ diblock copolymer thin films using self-consistent field theory (SCFT) simulations. Specifically, we examine a hexagonal confinement well with side length

Photoconductive lifetimes of carbon nanotubes films

November 29, 2007
Author(s)
Katie Hurst, Richard K. Ahrenkiel, Steve W. Johnston, Anne Dillon, Lara Roberson, John H. Lehman
The photoconductive recombination lifetimes of carbon nanotube (CNT) thin films as a function of wavelength are measured by resonant-coupled photoconductive decay (RCPCD) method (1). The carrier recombination lifetime is a fundamental property of carbon

Developing an Interpretability Scale for Motion Imagery

November 27, 2007
Author(s)
J Irvine, A Aviles, D Cannon, Charles D. Fenimore, Donna Haverkamp, S Israel, G O'Brien, John W. Roberts
The motion imagery community would benefit from the availability of standard measures for assessing image interpretability. The National Imagery Interpretability Rating Scale (NIIRS) has served as a community standard for still imagery, but no comparable

Evolution of Modern Approaches to Express Uncertainty in Measurement

November 27, 2007
Author(s)
Raghu N. Kacker, K D. Sommer, Bernd Siebert
The object of this paper is to discuss evolution of the concept of uncertainty in measurement and methods for its quantification from the classical error analysis to the modern approaches based on the Guide to the Expression of Uncertainty in Measurement

Long-term Stability of Remote Clock Comparisons with IGS Clock Products

November 27, 2007
Author(s)
Victor S. Zhang, Thomas E. Parker, Marc A. Weiss
The International GNSS Service (IGS) clock products contain clock information of the local reference for the IGS tracking receivers with respect to the IGS time. The clock information is obtained from GPS carrier-phase measurements. Many timing

Magnetic Levitation System for the Dissemination of a Non-Artifact Based Kilogram

November 27, 2007
Author(s)
Zeina J. Kubarych, Patrick J. Abbott, Edwin R. Williams, Ruimin Liu, Vincent J. Lee
We describe a new approach to directly link air and vacuum mass measurements. This approach uses magnetic levitation along with vacuum and balance technology to realize vacuum mass measurements. It provides direct traceability to the International

Overview of the TREC 2006 Blog Track

November 27, 2007
Author(s)
Iadh Ounis, Maarten de Rijke, Craig Macdonald, Gilad Mishne, Ian Soboroff
The Blog track began this year, with the aim to explore the information seeking behaviour in the blogosphere. For this purpose, a new large-scale test collection, namely the TREC Blog06 collection, has been created. In the first pilot run of the track in

Standard Time and Frequency Dissemination via Eqyptian Digital Satellite

November 27, 2007
Author(s)
John P. Lowe, Jason Heidecker, Mohamed A. Swidan, Ahmed Hisham, Safaa Samuel
The Egyptian Satellite Company and the National Institute for Standards (NIS) in Egypt, with technical assistance from the National Institute of Standards and Technology (NIST) in the United States, are collaborating to broadcast frequency and time

Statistical Analysis of 4 MN Force Range Key Comparison

November 27, 2007
Author(s)
Thomas W. Bartel
The factors contributing to the uncertainty are discussed for the measurements that were conducted for the 2 MN and 4MN force values of the very high force CIPM key comparison. Details of the statistical analysis by the pilot institute, NIST, are provided

Sub-Doppler Laser Cooling and Magnetic Trapping of Erbium

November 27, 2007
Author(s)
Andrew J. Berglund, Simone Lee, Jabez J. McClelland
We investigate cooling mechanisms in magneto-optically and magnetically trapped erbium. We find efficient sub-Doppler cooling in our trap, which can persist even in large magnetic fields due to the near degeneracy of two Lande g factors. Furthermore, a

Closed Loop CNC Manufacturing -- Connecting the CNC to the Enterprise

November 26, 2007
Author(s)
Sid Venkatesh, Rich Morihara, John L. Michaloski, Frederick M. Proctor
Closed Loop manufacturing describes the use of feedback from a Computer Numerical Control (CNC) to the Enterprise Resource Planning (ERP) to help in business operations. Although conceptually simple, many obstacles make CNC-ERP connectivity difficult -
Displaying 30801 - 30825 of 74070