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Search Publications

NIST Authors in Bold

Displaying 27101 - 27125 of 73697

Asynchronous Cooperative MIMO Systems using A Linear Dispersion Structure

February 2, 2010
Author(s)
Hamid Gharavi
In this treatise, we propose a novel family of Asynchronous Cooperative Linear Dispersion Codes (ACLDCs),which is capable of maintaining full diversity in cooperative scenarios even at the presence of asynchronous reception. The linear dispersion structure

Electromagnetic Wave Dynamics in Matter-Wave Superradiant Scattering

February 2, 2010
Author(s)
Lu Deng, Edward W. Hagley, Marvin Payne
We present a small-signal wave propagation theory on matter-wave superradiant scattering. We show, in a longitudinally excited condensate, that the backward-propagating, superradiantly generated optical field propagates with ultraslow group velocity and

Overlap-Based Cell Tracker

February 2, 2010
Author(s)
Joe Chalfoun, Antonio Cardone, Alden A. Dima, Michael Halter, Daniel P. Allen
In order to facilitate the extraction of quantitative data from live cell image sets, automated image analysis methods are needed. This paper presents an introduction to the general principle of an overlap cell tracking software developed by NIST. This

Whisker Formation in Pb-Free Surface Finishes

February 2, 2010
Author(s)
Gery R. Stafford, Maureen E. Williams, Jae W. Shin, Kil-Won Moon, William J. Boettinger, Carlos R. Beauchamp
Tin(Sn)-lead(Pb) alloys have been used extensively for surface finishing of electronic components in part because Pb was found to be effective in retarding Sn whisker growth in electrodeposits. Altough whiskers appear to be a local response to the

A superconducting nanowire single-photon detector system for single-photon source characterisation

February 1, 2010
Author(s)
C. R. Fitzpatrick, C. M. Natarajan, R. E. Warburton, G. S. Buller, Burm Baek, Sae Woo Nam, Shigehito Miki, Z. Wang, Masahide Sasaki, A. G. Sinclair, Robert Hadfield
Single-photon sources and detectors are key enabling technologies for photonics in quantum information science and technology (QIST). QIST applications place high-level demands on the performance of sources and detectors; it is therefore essential that

Application Modes of Egress Simulation

February 1, 2010
Author(s)
Steve M. Gwynne, Erica D. Kuligowski
The evacuation process is influenced by historical events. These can reflect previous incidents, training, and the routine use of the structure. These need to be considered during the design process as they will influence occupant behavior. In addition

Attacking Paper-Based E2E Voting Systems

February 1, 2010
Author(s)
John M. Kelsey, Andrew R. Regenscheid, Tal Moran, David Chaum
In this paper, we develop methods for constructing vote-buying/coercion attacks on end-to-end voting systems, and describe vote-buying/coercion attacks on three end-to-end voting systems: Punchscan, Pret-a-Voter, and Threeballot. We also demonstrate a

Characterization of SiGe Films for use as a National Institute of Standards and Technology (NIST) Microanalysis Reference material (RM 8905)

February 1, 2010
Author(s)
Ryna B. Marinenko, Shirley Turner, David S. Simons, Savelas A. Rabb, Rolf L. Zeisler, Lee L. Yu, Dale E. Newbury, Rick L. Paul, Nicholas W. Ritchie, Stefan D. Leigh, Michael R. Winchester, Lee J. Richter, Douglas C. Meier, Keana C. Scott, D Klinedinst, John A. Small
Bulk SiGe wafers cut from single-crystal boules and two SiGe thick films (4 m and 5 m thick) on Si wafers were evaluated with the electron probe microanalyzer for the extent of heterogeneity and composition for use as reference materials needed by the

Complete Inspection: In-situ system to inspect 100% of micro-parts

February 1, 2010
Author(s)
Shawn P. Moylan
On-machine measurement can provide significant advantages in part metrology at the micro/meso-scale. The strengths of measurement by fringe projection techniques directly address the difficulties presented by on-machine measurement. An experimental setup

Electrically-stimulated gradients in water and counterion concentrations within electroactive polymer actuators

February 1, 2010
Author(s)
Jong Keun Park, Paul J. Jones, Chris Sahagun, Kirt A. Page, Daniel S. Hussey, David L. Jacobson, Sarah E. Morgan, Robert B. Moore
While ionic polymer metal composites (IPMCs) have been studied for more than 10 years, the specific actuation mechanism is still unclear. In this work, neutron imaging, applied potential (AP) and current sensing (CS) atomic force microscopy (AFM) methods

NIST HB 105-4, Specifications and Tolerances for Reference Standards and Field Standard Weights and Measures 4. Specifications and Tolerances for Liquefied Petroleum Gas and Anhydrous Ammonia Pressurized Volumetic Field Standards

February 1, 2010
Author(s)
Georgia L. Harris, L.F. Eason
These specifications and tolerances are recommended as minimum requirements for standards used by state and local weights and measures officials and others in the regulatory verification of meters used in quantity determination of pressurized liquid

Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell

February 1, 2010
Author(s)
Ricardo Jimenez Martinez, William C. Griffith, Ying-ju Wang, Svenja A. Knappe, John E. Kitching, Ken Smith, Mark Prouty
We compare the sensitivity performance of two optically pumped atomic magnetometers based on the Mx and frequency-modulated Bell-Bloom configurations. The Cs magnetometers are implemented using a millimeter-scale microfabricated vapor cell in a

The Need for Behavioral Theory in Evacuation Modeling

February 1, 2010
Author(s)
Erica D. Kuligowski, Steve M. Gwynne
This paper posits the need for comprehensive theories about human behavior in fire evacuations. These would be of value in and of themselves to improve training, education, and future data collection efforts, but would also allow for a complete behavioral

Three steps towards metrological traceability for ballistics signature measurements

February 1, 2010
Author(s)
Jun-Feng Song, Theodore V. Vorburger, Robert M. Thompson, Thomas Brian Renegar, Xiaoyu Alan Zheng, Li Ma, James H. Yen, Martin Ols
The National Institute of Standards and Technology (NIST) in collaboration with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) has developed the Standard Reference Material (SRM) 2460 bullets and 2461 casings. NIST and ATF are proposing to
Displaying 27101 - 27125 of 73697
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