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Search Publications

NIST Authors in Bold

Displaying 22301 - 22325 of 73697

Effect of the Spherical Indenter Tip Assumption on the Initial Plastic Yield Stress

October 17, 2012
Author(s)
Li Ma, Lyle E. Levine, Ronald G. Dixson, Douglas T. Smith, David Bahr
Nanoindentation is widely used to explore the mechanical properties of small volumes of materials. For crystalline materials, there is a growing experimental and theoretical interest in pop-in events, which are sudden displacement-burst excursions during

Second Virial Coefficients of H2 and its Isotopologues from a Six-Dimensional Potential

October 17, 2012
Author(s)
Giovanni Garberoglio, Piotr Jankowski, Krzysztof Szalewicz, Allan H. Harvey
We employ path-integral Monte Carlo techniques to compute the second virial coefficient as a function of temperature for molecular hydrogen (H2), deuterium (D2), and tritium (T2), along with the mixed isotopologues HD, HT, and DT. The calculations utilize

Significance Test in Speaker Recognition Data Analysis with Data Dependency

October 17, 2012
Author(s)
Jin Chu Wu, Alvin F. Martin, Craig S. Greenberg, Raghu N. Kacker, Vincent M. Stanford
To evaluate the performance of speaker recognition systems, a detection cost function defined as a weighted sum of the probabilities of type I and type II errors is employed. The speaker datasets may have data dependency due to multiple uses of the same

Vacuum-Assisted Gas Atomization of Liquid Metal

October 17, 2012
Author(s)
Steven Mates, Stephen D. Ridder, Frank S. Biancaniello, Tony Zahrah
Vacuum-assisted gas atomization of liquid metal is explored. The investigation is motivated by observations of liquid metal atomization which indicate that secondary atomization is sustained over an extended distance from the nozzle tip. Increasing the

Efficient Algorithms for T-way Test Sequence Generation

October 16, 2012
Author(s)
Linbin Yu, Yu Lei, Raghu N. Kacker, D. Richard Kuhn, James F. Lawrence
Combinatorial testing has been shown to be a very effective testing strategy. Most work on combinatorial testing focuses on t-way test data generation, where each test is an unordered set of parameter values. In this paper, we study the problem of t-way

Notional Supply Chain Risk Management Practices for Federal Information Systems

October 16, 2012
Author(s)
Jon M. Boyens, Celia Paulsen, Nadya Bartol, Rama Moorthy, Stephanie Shankles
This publication is intended to provide a wide array of practices that, when implemented, will help mitigate supply chain risk to federal information systems. It seeks to equip federal departments and agencies with a notional set of repeatable and

Bi2Te3 and Bi2Te3-xSx FOR THERMOELECTRIC APPLICATIONS

October 15, 2012
Author(s)
Winnie K. Wong-Ng, N D. Lowhorn, Joshua B. Martin, Peter Zavalij, Howard Joress, Qingzhen Huang, Yonggao Y. Yan, Azzam Mansour, Evans L. Thomas, Jihui Yang, Martin L. Green
The increased interest in research and development on thermoelectric materials is partly due to the need for improved efficiency in the global utilization of energy resources. Historically, Bi2Te3 occupies an important position in the thermoelectric

Broadband Emissivity Calibration of Highly Reflective Samples at Cryogenic Temperatures

October 15, 2012
Author(s)
Solomon I. Woods, Timothy M. Jung, Greg Ly, Simon G. Kaplan, Jie Yu
We have developed a technique for calibrating the broadband optical emissivity of high reflectivity samples at cryogenic temperatures. This measurement method employs a primary standard optical detector with high absorptance from visible wavelengths to

Certification of NIST SRM 2569 Lead Paint Films for Children's Products

October 15, 2012
Author(s)
John L. Molloy, John R. Sieber, Karen E. Murphy, Stephen E. Long, Stefan D. Leigh
SRM 2569 Lead Paint Films for Children’s Products is a new Standard Reference Material (SRM) developed for use primarily with XRF instrumentation. It consists of three paint coatings, with nominally 0 mg/kg, 90 mg/kg, and 300 mg/kg of Pb added, on

Evaluation of Cation-Exchanged Zeolite Adsorbents for Post-Combustion Carbon Dioxide Capture

October 15, 2012
Author(s)
Tae-Hyun Bae, Matthew Ross Hudson, Jarad A. Mason, Wendy Queen, J.J. Dutton, Kenji Sumida, Ken J. Micklash, Steven S. Kaye, Craig Brown, Jeffrey R. Long
A series of zeolite adsorbents was evaluated for potential application in post-combustion (CO 2) capture. Among zeolites tested, Ca-A showed the highest CO 2 uptake together with an excellent CO 2 selectivity over N 2 at conditions relevant to capture from

Photon Temporal Correlations Measured Using a Dual-Channel Upconversion Detector

October 14, 2012
Author(s)
Paulina Kuo, Jason S. Pelc, Oliver T. Slattery, Martin M. Fejer, Xiao Tang
We demonstrate application of a dual-channel upconversion detector as a beamsplitter that preserves photon statistics. We use this beamsplitter to characterize temporal correlations of photons from coherent and pseudo-thermal sources.

Aggregation/agglomeration state of carbon nanotubes

October 12, 2012
Author(s)
Vivek M. Prabhu, Toshiya Okazaki, Takeshi Eitoku, Masayoshi Tange, Haruhisa Kato
Evaluation of aggregation and agglomeration of carbon nanotube (CNT) solution has been one of the key issues for applications. Here we introduce a simple method based on depolarized dynamic light scattering (DDLS) performed at multiple scattering angles to

An IEEE Standard Ontology for Robotics and Automation

October 12, 2012
Author(s)
Craig I. Schlenoff, Edson Prestes, Rajmohan Madhavan, Paulo Goncalvest, Howard Li, Stephen B. Balakirsky, Thomas R. Kramer, Emilio Miguelanez
In this article, we discuss a newly formed IEEE- RAS working group entitled Ontologies for Robotics and Automation (ORA). The goal of this working group is to develop a standard ontology and associated methodology for knowledge representation and reasoning

An Industrial Robotic Knowledge Representation for Kit Building Applications

October 12, 2012
Author(s)
Stephen B. Balakirsky, Zeid Kootbally, Craig I. Schlenoff, Thomas R. Kramer, Satyandra K. Gupta
The IEEE RAS Ontologies for Robotics and Automation Working Group is dedicated to developing a methodology for knowledge representation and reasoning in robotics and automation. As part of this working group, the Industrial Robots sub-group is tasked with

Collaborative Robotics: Measuring Blunt Force Impacts on Humans

October 12, 2012
Author(s)
Joseph A. Falco, Jeremy A. Marvel, Richard J. Norcross
Robot manufacturers are developing a new generation of industrial robots that are designed to work in collaborative environments in close proximity to humans. In parallel, an international standards effort is developing a technical specification to support
Displaying 22301 - 22325 of 73697
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