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Displaying 25126 - 25150 of 74176

Report of the 95th National Conference on Weights and Measures

June 10, 2011
Author(s)
Linda D. Crown, Tina G. Butcher, Steven E. Cook, Lisa Warfield, David A. Sefcik
The 95th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 11 to 15, 2010, at the Crowne Plaza St. Paul Riverfront, St. Paul, Minnesota. The theme of the meeting was “Breaking Molds to Shape the Future.” Reports by the

Controlled Vapor Deposition Approach to Generating Surface Energy/Chemistry Gradients

June 9, 2011
Author(s)
Julie N. Albert, Joey D. Kim, Christopher Stafford, Thomas H. Epps
Substrate surface energy/chemistry gradients provide a means for high-throughput exploration of the surface interactions that are important for many chemical and biological processes. We describe the implementation of a controlled vapor deposition approach

Dzyaloshinskii-Moriya Interaction and Spin Re-Orientation Transition in the Frustrated Kagome Lattice Antiferromagnet

June 9, 2011
Author(s)
K. Matan, B. M. Bartlett, Joel Helton, V. Sikolenko, S. Mat'as, K. Prokes, Ying Chen, Jeffrey W. Lynn, D. Grohol, T. J. Sato, M. Tokunaga, D. G. Nocera, Y. S. Lee
Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin-5/2} kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in

Strongly quadrature-dependent noise in superconducting microresonators measured at the vacuum-noise limit

June 9, 2011
Author(s)
Jiansong Gao, Kent D. Irwin, Gene C. Hilton, John A. Mates, Daniel R. Schmidt, Leila R. Vale, Konrad W. Lehnert, Francois Mallet, Jonas Zmuidzinas
We report noise measurement of superconducting micro-resonators with a Josephson parametric amplifier. These resonators show significant amount of frequency noise caused by surface two-level systems. However, in the dissipation quadrature, no excess noise

Successful Design of Biometric Tests in a Constrained Environment

June 9, 2011
Author(s)
Vladimir N. Dvornychenko
The National Institute of Standards and Technology (NIST), with participation of the biometrics community, conducts evaluations of biometrics-based verification and identification systems. Among the more challenging is testing of automated latent

Thin Film Dynamics on a Prolate Ellipsoid with Application to the Cornea

June 9, 2011
Author(s)
Richard J. Braun, R. Usha, Geoffrey B. McFadden, T. A. Driscoll, L. P. Cook, P. E. King-Smith
We study the flow of a thin fluid film on a prolate ellipsoid that is a good approximation to the shape of the human cornea. Two lubrication models for the dynamics of the film are studied in prolate spheroidal coordinates which are appropriate for this

Analytical and Experimental Assessment of Steel Truss Bridge Gusset Plate Connections

June 8, 2011
Author(s)
Mark A. Iadicola, Yavuz Mentes, Yoon D. Kim, Robert S. Zobel, Donald W. White, Roberto T. Leon, Justin M. Ocel
This paper focuses on findings from comprehensive studies of steel truss bridge gusset plate behavior and proposes practical design procedures. The studies include comparisons of analytical models to responses from large-scale experimental tests from

Comparison of absolute measurements of laser power using next generation NIST high power radiometer and Air Force high power calorimeter

June 8, 2011
Author(s)
Marla L. Dowell, Christopher L. Cromer, Xiaoyu X. Li, John Bagford, Dan Seibert, John Eric, David Cooper, Steven Comisford, Ernie Cromwell, Richard Bowling
We report comparisons of laser power measurements between the new NIST radiometer, also known as the BB Prime, and the current Air Force standards, known as the BB calorimeter. [1] These measurements were performed using high power laser sources in the Air

Cybersecurity, Innovation and the Internet Economy

June 8, 2011
Author(s)
Ari M. Schwartz
The Department of Commerce's Internet Policy Task Force Green Paper on Cybersecurity, Innovation and the Internet Economy recommends consideration of a new framework for addressing internet security issues for companies outside the orbit of critical

Guide to Industrial Control Systems (ICS) Security - Supervisory Control and Data Acquisition (SCADA) systems, Distributed Control Systems (DCS), and other control system configurations such as Programmable Logic Controllers (PLC)

June 7, 2011
Author(s)
Keith A. Stouffer, Joseph A. Falco, Karen A. Scarfone
NIST Special Publication (SP) 800-82, Guide to Industrial Control Systems (ICS) Security, provides guidance on how to secure Industrial Control Systems (ICS), including Supervisory Control and Data Acquisition (SCADA) systems, Distributed Control Systems

Negative Regulation of STAT3-mediated Cellular Respiration by SirT1

June 7, 2011
Author(s)
Lili Wang, Hua-Jun He, Michel Bernier, Rajib K. Paul, Alejandro Martin-Montalvo, Morten Scheibye-Knudsen, Shaoming Song, Sean M. Armour, Vilhelm A. Bohr, Yaping Zong, David A. Sinclair, Rafael de Cabo
In mammals, the transcriptional activity of signal transducer and activator of transcription 3 (STAT3) is regulated by the deacetylase SirT1. However, whether the newly described non-genomic actions of STAT3 toward mitochondrial oxidative phosphorylation

Physicochemical characterization and in vitro hemolysis evaluation of silver nanoparticles

June 7, 2011
Author(s)
Vytautas Reipa, Jonghoon Choi, Nam S. Wang, Victoria M. Hitchins, Peter L. Goering, Robert Malinauskas
In anticipation of the increased use of various forms of silver as an antimicrobial agent in medical devices, the objective of this study was to evaluate the in vitro hemolytic potential of silver nanoparticles in dilute human blood, and to relate particle

An Equation of State for the Thermodynamic Properties of Dimethyl Ether

June 6, 2011
Author(s)
Yong Zhou, Jiangtao Wu, Eric Lemmon
A thermodynamic property formulation for dimethyl ether has been developed based on a selection of experimental thermodynamic property data. The formulation includes a fundamental equation, a vapor pressure equation, and saturated density equations for

Combinatorial and High-throughput Screening of Biomaterials

June 6, 2011
Author(s)
Carl Simon Jr., Sheng Lin-Gibson
The review describes recent advances in utilizing combinatorial and high-throughput methods to better understand cell-material interactions, in terms of cell toxicity, adhesion, morphology, migration, proliferation and differentiation, particularly

Five Grand Challenges in Pedestrian and Evacuation Dynamics

June 6, 2011
Author(s)
Jason D. Averill
This paper identifies five grand challenges in the multidisciplinary field of pedestrian and evacuation dynamics (PED). In order to maximize the ef-fectiveness of limited resources, the PED community would benefit greatly from a prioritized, consensus

Method for determining the irreversible strain limit of Nb 3 Sn wires

June 6, 2011
Author(s)
Loren F. Goodrich, Najib Cheggour, Xifeng Lu, Jolene D. Splett, Theodore C. Stauffer, Bernard J. Filla
We have defined a rigorous and reliable method for determining the irreversible strain limit of Nb 3Sn wires. The critical current (I c) is measured as a function of applied longitudinal strain (ε), I c(ε), at one magnetic field and a temperature of 4.0 K

Modeling and DIC Measurements of Dynamic Compression Tests of a Soft Tissue Simulant

June 6, 2011
Author(s)
Steven P. Mates, Aaron M. Forster, R Rhorer, Amit Bagchi, Richard Everett, Kirth Simmonds
Stereoscopic digital image correlation (DIC) is used to measure the shape evolution of a soft, transparent thermoplastic material subject to a high strain rate compression test performed using a Kolsky bar. Rather than using the usual Kolsky bar wave
Displaying 25126 - 25150 of 74176
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