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Displaying 1576 - 1600 of 2724

High-Frequency Dielectric Measurements: A Tutorial

April 1, 2010
Author(s)
James R. Baker-Jarvis, Michael D. Janezic, Donald C. DeGroot
KNOWLEDGE of the response of materials to electromagnetic (EM) fields in the frequency range of radio frequency (RF) through terahertz (THz) is critical to numerous research projects and electronic product development activities. Electromagnetic waves in

Influence of Ti and Ta doping on the irreversible strain limit of ternary Nb 3 Sn superconducting wires made by the restacked-rod process

April 1, 2010
Author(s)
Najib Cheggour, Loren F. Goodrich, Theodore C. Stauffer, Jolene D. Splett, Xifeng Lu, A. K. Ghosh, G. Ambrosio
Nb 3Sn superconducting wires made with restacked-rod process (RRP®) were found to have a dramatically improved resilience to axial tensile strain when alloyed with Ti as compared to Ta. Whereas Ta-alloyed Nb 3Sn in RRP wires showed permanent damage to its

The Limits and Extensibility of Optical Patterned Defect Inspection

April 1, 2010
Author(s)
Richard M. Silver, Bryan M. Barnes, Martin Y. Sohn, Richard Quintanilha, Hui Zhou, Chris Deeb, Mark Johnson, Milton Goodwin, Dilip Patel
New techniques recently developed at the National Institute of Standards and Technology using bright field optical tools are applied to signal-based defect analysis of features with dimensions well below the measurement wavelength. A key to this approach

Certification of Drugs of Abuse in a Human Serum Standard Reference Material: SRM 1959

March 24, 2010
Author(s)
Susan S. Tai, Jocelyn L. Prendergast, Lorna T. Sniegoski, Michael J. Welch, Karen W. Phinney, Nien F. Zhang
A new Standard Reference Material (SRM) for drugs of abuse in human serum (SRM 1959) has been developed. SRM 1959 is a frozen human serum material fortified with seven drugs of abuse, benzoylecgonine (BZE), methadone (METH), methamphetamine (MAMP)

Improved NIST Airspeed Calibration Facility

March 23, 2010
Author(s)
Iosif I. Shinder, J. M. Hall, Michael R. Moldover
The National Institute of Standards and Technology (NIST) uses a laser Doppler anemometer (LDA) as a working standard for airspeed calibrations in the range 0.15 m/s to 75 m/s (0.34 to 168 miles/hour). We report improved procedures for calibrating the LDA

Influence of molecular mass on the modulus of thin polystyrene films

March 21, 2010
Author(s)
Jessica M. Torres, Christopher Stafford, Bryan D. Vogt
In this work, we examine the influence of relative molecular mass (Mn, or the number average molecular mass) of PS on the thickness-dependent moduli using a wrinkling based instability of a stiff film on an elastic substrate. This wrinkling based metrology

Measurement Science Roadmap for Net-Zero Energy Buildings

March 18, 2010
Author(s)
Joan Pellegrino, Arthur H. Fanney, Andrew K. Persily, Piotr A. Domanski, William M. Healy, Steven T. Bushby
Buildings account for nearly a third of the world s energy use today, and this share is expected to rise along with population growth and levels of prosperity. In the United States, residential and commercial buildings consume about 40% of primary energy

Neutron radioscopy: industrial and scientific applications

March 15, 2010
Author(s)
Daniel Hussey, Michael A. Hickner
Neutron imaging has been a unique, precise, measurement tool for water transport in proton exchange membrane fuel cells (PEMFCs), enabling the direct measurement of the water distribution in standard, commercially viable fuel cell hardware. Thus, in the

Water based Polyurethane Graphene Oxide Nanocomposites

March 3, 2010
Author(s)
Coralie Bernard, Tinh Nguyen, Bastien T. Pellegrin, Mat Celina, Alexander J. Shapiro, Deborah Jacobs, Kar T. Tan, Sungjin Park, R. S. Ruoff, Joannie W. Chin
Graphene oxides are potentially a new class of nanomaterial to enhance multifunctional properties of polymers because of their remarkable thermal conductivity, mechanical strength, and more importantly, low cost. The graphene oxides, produced by

Utility Assessment in TRANSTAC: Using a set of complementary methods

February 8, 2010
Author(s)
Michelle P. Steves, Emile L. Morse
This paper describes the methods used during formative utility assessments for speech-to-speech, real-time translation systems intended for tactical use. The systems, while still prototypical, had hardware platforms that could be exercised indoors or

Comparison of Large-Signal-Network-Analyzer Calibrations

February 5, 2010
Author(s)
Dylan F. Williams, Catherine A. Remley, Joe Gering, Grand Aivazian
We develop a procedure and metrics for comparing large-signal-network-analyzer calibrations. The metrics we develop provide a bound on differences between measurements obtained from large-signal-network-analyzer calibrations, as well as more specific
Displaying 1576 - 1600 of 2724
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