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Displaying 27001 - 27025 of 73832

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

Interference of Single Photons from Two Separate Semiconductor Quantum Dots

April 1, 2010
Author(s)
Edward B. Flagg, Andreas Muller, Sergey V. Polyakov, Alexander E. Ling, Glenn S. Solomon
We demonstrate and characterize interference between discrete photons emitted by two separate semiconductor quantum dot states in different samples excited by a pulsed laser. Their energies are tuned into resonance using strain. The photons have a total

Internal quantum efficiency modeling of silicon photodiodes

April 1, 2010
Author(s)
Thomas R. Gentile, Steven W. Brown, Keith R. Lykke, Ping-Shine Shaw, John T. Woodward IV
Results are presented for modeling of the internal quantum efficiency (IQE) of silicon photodiodes in the 400 nm to 900 nm wavelength range. The IQE data are based on measurements of the external quantum efficiencies of three transmission trap detectors

Life history as a source of variation for persistent organic pollutant (POP) patterns in a bottlenose dolphin community resident to Sarasota Bay, FL

April 1, 2010
Author(s)
Jennifer Yordy, John R. Kucklick, Randall S. Wells, Brian C. Balmer, Lori Schwacke, Teresa Rowles
Bottlenose dolphins (Tursiops truncatus) are prone to accumulating complex mixtures of persistent organic pollutants (POPs). While variations in POP patterns have been previously observed for populations separated across regional and fine-scale geographic

Multiwalled carbon nanotubes coated with silicon carbonitride (SiCN)

April 1, 2010
Author(s)
Katie Hurst, Christopher L. Cromer, Elisabeth Mansfield, Roop Mahajan, John H. Lehman, Gurpreet Singh
We describe the development of two next-generation optical coatings; amorphous polymer-derived silicon carbonitride (SiCN) particles and a composite consisting of SiCN surrounding a multiwalled carbon nanotube (MWCNT) core. Laser-induced damage testing of

Niobium-silicide junction technology for superconducting digital electronics

April 1, 2010
Author(s)
David I. Olaya, Paul D. Dresselhaus, Samuel P. Benz
We present a technology based on Nb/NbxSi1-x/Nb junctions, with barriers near the metal-insulator transition, for applications in superconducting electronics (SCE) as an alternative to Nb/AlOx/Nb tunnel junctions. Josephson junctions with co-sputtered

NIST Gas Hydrate Research Database and Web Dissemination Channel

April 1, 2010
Author(s)
Kenneth G. Kroenlein, Vladimir Diky, Robert D. Chirico, Andrei F. Kazakov, Chris D. Muzny, Michael D. Frenkel
To facilitate advances in application of technologies pertaining to gas hydrates, a freely available data resource containing experimentally-derived information about those materials was developed. This work was performed by the Thermodynamic Research

Novel Dimethacrylates with Quaternary Ammonium Functionalities for Reduced Bacteria Adhesion

April 1, 2010
Author(s)
Nancy Lin, Joseph M. Antonucci, Diana N. Zeiger, Kathy Tang, Bruce O. Fowler, Sheng Lin-Gibson
Biofilm growth and secondary caries have resulted in the failure of many dental composite restorations. One approach to address this issue is the modification of dental materials to reduce bacterial adhesion and biofilm growth. Quaternary ammonium salts

On Hash Functions Using Checksums

April 1, 2010
Author(s)
Praveen Gauruvarum, John M. Kelsey, L. Knudsen, S. Thomsen
We analyse the security of iterated hash functions that compute an input dependent checksum which is processed as part of the hash computation. We show that a large class of such schemes, including those using non-linear or even one- way checksum functions

Resource Letter FC-1: The physics of fundamental constants

April 1, 2010
Author(s)
Peter J. Mohr, David B. Newell
This Resource Letter is a guide to the literature describing both experimental and theoretical work on the determination of values of certain fundamental physical constants. In this Letter, fundamental physical constants are taken to be the experimentally

Rheology and Setting of High Volume Fly Ash Mixtures

April 1, 2010
Author(s)
Dale P. Bentz, Chiara F. Ferraris
While high volume fly ash (HVFA) concretes can be designed and produced to meet 28-d strength requirements and often even exceed the durability performance of conventional concretes, a persistent problem is the potentially long delay in setting time that

Sub-50 nm measurements using a 193 nm angle-resolved scatterfield microscope

April 1, 2010
Author(s)
Richard Quintanilha, Martin Y. Sohn, Bryan M. Barnes, Richard M. Silver
Resist-on-silicon sub-50 nm targets have been investigated using a 193 nm angle-resolved scatter field microscope(ARSM). The illumination path of this microscope allows customization of the Conjugate Back Focal Plane (CBFP) while separate collection paths

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

Wireless Sensor Network Performance Metrics for Building Applications

April 1, 2010
Author(s)
Won Suk Jang, William M. Healy
Metrics are investigated to help assess the performance of wireless sensors in buildings. Wireless sensor networks present tremendous opportunities for energy savings and improvement in occupant comfort in buildings by making data about conditions and

Calibration of 1 nm SiC Step Height Standards

March 31, 2010
Author(s)
Theodore V. Vorburger, Albert M. Hilton, Ronald G. Dixson, Ndubuisi G. Orji, J. A. Powell, A. J. Trunek, P. G. Neudeck, P. B. Abel
We aim to develop and calibrate a set of step height standards to meet the range of steps useful for nanotechnology. Of particular interest to this community is the calibration of atomic force microscopes operating at their highest levels of magnification

Clifford Glenwood Shull

March 31, 2010
Author(s)
Robert D. Shull
In 1975 Clifford Glenwood Shull was elected to membership in the National Academy of Science. He had earlier, 1956, been admitted to the American Academy of Arts and Sciences, and would in 1994 be awarded the Nobel Prize in Physics. These and other honors

Estimation of the Enhancement Factor for Mercury in Air

March 31, 2010
Author(s)
Allan H. Harvey
A combination of classical thermodynamics and molecular theory was used to calculate the enhancement factor (ratio of partial pressure to saturated vapor pressure) for liquid mercury in equilibrium with air at standard atmospheric pressure in the

Performance Evaluation and Benchmarking of Robotic and Automation Systems

March 31, 2010
Author(s)
Rajmohan Madhavan, Elena R. Messina, Angel P. Del Pobil
The Technical Committee on Performance Evaluation and Benchmarking for Robotic and Automation Systems (TC-PEBRAS) was approved at the Technical Activities Board (TAB) meeting held at the 2009 International Conference on Robotics and Automation (ICRA) in

Proximity-associated errors in contour metrology

March 31, 2010
Author(s)
John S. Villarrubia, Ronald G. Dixson, Andras Vladar
In contour metrology the CD-SEM (critical dimension scanning electron microscope) assigns a continuous boundary to extended features in an image. The boundary is typically assigned as a simple function of the signal intensity, for example by a brightness
Displaying 27001 - 27025 of 73832
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