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Displaying 25576 - 25600 of 73697

Securing WiMAX Wireless Communications

December 27, 2010
Author(s)
Shirley M. Radack
This bulletin summarizes the information presented in NIST Special Publication (SP) 800-127, Guide to Securing WiMAX Wireless Communications: Recommendations of the National Institute of Standards and Technology. The publication, which was written by Karen

A Benchmark for Best View Selection of 3D Objects

December 23, 2010
Author(s)
Helin Dutagaci, Chun Pan (Benny) Cheung, Afzal A. Godil
The best view selection corresponds to the task of automatically selecting the most representative view of a 3D model. In this paper, we describe a benchmark for evaluation of best view selection algorithms. The benchmark consists of the preferred views of

Evidence that the reversible strain effect on critical current density and flux pinning in Bi2Sr2Ca2Cu3Ox tapes is caused entirely by the pressure dependence of the critical temperature

December 23, 2010
Author(s)
Daniel C. van der Laan, J. F. Douglas, Cameron C. Clickner, Theodore C. Stauffer, Loren F. Goodrich, Hans J. van Eck
It is well known that the critical temperature of cuprate- and iron-based high-temperature superconductors changes with pressure. YBa 2Cu 3O 7-δ coated conductors, as well as Bi 2Sr 2CaCu 2O x and Bi 2Sr 2Ca 2Cu 3O x tapes and wires, show a clear

Influence of Polyethyleneimine Graftings of Multi-Walled Carbon Nanotubes on Their Accumulation and Elimination by and Toxicity to Daphnia magna

December 23, 2010
Author(s)
Elijah J. Petersen, Roger A. Pinto, Danielle J. Mai, Peter E. Landrum, Walter J. Weber
Carbon nanotubes (CNTs) are often modified for different intended applications which often changes the nanotubes’ physicochemical properties, such as surface charge. Assessing the extent to which such modifications to carbon nanotubes influence their

Superconducting multiplexer filter bank for a frequency-selective power limiter

December 23, 2010
Author(s)
Eduard Rocas, Alberto Padilla, Jordi Mateu, Juan C. Collado Gomez, James C. Booth, Juan M. O'Callaghan
This work proposes a superconducting multiplexer filter bank configuration to be used as a frequency-selective power limiter. The proposed configuration limits narrowband high power signals without degrading the signal performance in the remainder

Torsion Balance Test of Couplings to Spin

December 23, 2010
Author(s)
Blayne R. Heckel, Eric G. Adelberger, William A. Terrano, Claire E. Cramer
This article describes constraints on possible new spin-coupled interactions using a torsion pendulum with approximately 1 × 1023 polarized electrons.

High Temperature Seebeck Coefficient Metrology

December 22, 2010
Author(s)
Joshua B. Martin, Terry M. Tritt, Winnie K. Wong-Ng, Ctirad Uher
We present an overview of the challenges and practices of thermoelectric metrology at high temperature (300 K-1300 K). The Seebeck coefficient, when combined with thermal and electrical conductivity, is a useful property measurement for evaluating the

A Mathematical Model of Atmospheric Retention of Man-made CO_2 Emissions

December 21, 2010
Author(s)
Bert W. Rust
Rust and Thijsse [Proc. CSC'07 (2007) pp. 10-16], [CiSE, Vol. 10 (2008) pp. 49-59] have shown that global annual average temperature anomalies T(t) vary linearly with atmospheric CO_2 concentrations c(t). The c(t) can be related to man-made CO_2 emissions

Characterizing a Scatterfield Optical Platform for Semiconductor Metrology

December 21, 2010
Author(s)
Bryan M. Barnes, Ravikiran Attota, Richard Quintanilha, Martin Y. Sohn, Richard M. Silver
Scatterfield microscopy is the union of a high-magnification imaging platform and the angular and/or wavelength control of scatterometry at the sample surface. Scatterfield microscopy uses Köhler illumination, where each point on the source translates to a

Combined scanning probe and light scattering characterization of multi-stage self-assembly of targeted liposome-based delivery systems

December 21, 2010
Author(s)
Natalia Farkas, John A. Dagata, Chengli Yang, Antonina Rait, Kathleen Pirollo, Esther Chang
The mean size and size distribution of a targeted nanoparticle delivery system (NDS) strongly influences the intrinsic stability and functionality of this molecular complex, affects its performance as a systemic drug delivery platform, and ultimately

Scanning Probe Microscope Dimensional Metrology at NIST

December 21, 2010
Author(s)
John A. Kramar, Ronald G. Dixson, Ndubuisi G. Orji
Scanning probe microscopy (SPM) dimensional metrology efforts at the U.S. National Institute of Standards and Technology are reviewed. The main SPM instruments for realizing the International System of Units (SI) are the Molecular Measuring Machine, the

TDCR Measurements on Pu-241 at NIST

December 21, 2010
Author(s)
Denis E. Bergeron, Brian E. Zimmerman
We have performed a series of measurements on a Pu-241 solution using the triple-to-double coincidence ratio (TDCR) liquid scintillation technique. A similar series of measurements in 2007 revealed significant discord between activity values determined via

Benchmarks, Performance Evaluation and Contests for 3D Shape Retrieval

December 20, 2010
Author(s)
Afzal A. Godil, Zhouhui Lian, Helin Dutagaci
Benchmarking of 3D Shape retrieval allows developers and researchers to compare the strengths of different algorithms on a standard dataset. Here we discuss the different steps involved in developing a benchmark and some of the issues involved. We then

Common Reference Channels for Metrological Comparability

December 20, 2010
Author(s)
Ruediger Kessel, Tim Hewison
In this article we discuss the effect of the choice of reference during calibration on later use of the calibrated results, and how a reference should be chosen to support later use of the data. Starting from the concept of metrological comparability we

Femtotesla atomic magnetometry in a microfabricated vapor cell

December 20, 2010
Author(s)
William C. Griffith, Svenja A. Knappe, John Kitching
We describe an optically pumped 87Rb magnetometer with 4.5 fT/Hz 1/2 sensitivity when operated in the spin-exchange relaxation free (SERF) regime. The magnetometer uses a microfabricated vapor cell, consisting of a cavity etched in a 1 mm thick silicon
Displaying 25576 - 25600 of 73697
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