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Displaying 37676 - 37700 of 143780

Fire Dynamics: The Science of Fire Fighting

October 1, 2013
Author(s)
Daniel M. Madrzykowski
Fire dynamics can provide a firefighter with means to understand how a fire will grow and spread within a structure and how best to control that growth. Researchers have generated experimental results and computer models to explain how fire dynamics

Insight into Neutron Focusing: the Out-of-Focus Condition

October 1, 2013
Author(s)
Boualem Hammouda, David F. Mildner, A. Brulet, S. Desert
A three-pronged approach is used to investigate neutron focusing for small-angle neutron scattering instruments. The three methods are analytical calculations, resolution measurements, and computer simulations. A source aperture containing a single small

Learning About SANS Instruments and Data Reduction from Round Robin Measurements on Samples of Polystyrene Latex

October 1, 2013
Author(s)
Adrian R. Rennie, Maja S. Hellsing, Kathleen Wood, Elliot P. Gilbert, Lionel Porcar, Ralf Schweins, Charles D. Dewhurst, Peter Lindner, Richard K. Heenan, Sarah E. Rogers, Paul Butler, Jeffery R Krzywon, Ron E. Ghosh, Andrew J. Jackson, Marc Malfois
Round-robin measurements of polystyrene latex samples at a number of small-angle scattering facilities have been used to assess the current limits of reliability and reproducibility of scattering data as well as the accuracy of parameters derived from

Local electrical characterizations of cadmium telluride solar cells using low energy electron beam

October 1, 2013
Author(s)
Heayoung Yoon, Paul M. Haney, Dmitry A. Ruzmetov, Hua Xu, Marina S. Leite, Behrang H. Hamadani, Albert A. Talin
We investigate local electronic properties of cadmium telluride solar cells using electron beam induced current (EBIC) measurements with current-collecting patterned contacts. EBIC measurements are performed with a spatial resolution as high as ≈20 nm both

Surface science for improved ion traps

October 1, 2013
Author(s)
David P. Pappas, Dustin A. Hite, Andrew C. Wilson, David T. Allcock, David J. Wineland, Dietrich G. Leibfried, Yves Colombe
Trapped ions are sensitive to electric-field noise from trap-electrode surfaces. This noise has been an obstacle to progress in trapped-ion quantum information processing (QIP) experiments for more than a decade. It causes motional heating of the ions, and

The Distribution and Stratification of Persistent Organic Pollutants and Fatty Acids in Bottlenose Dolphin (Tursiops truncatus) Blubber

October 1, 2013
Author(s)
Debra Ellisor, William McLellan, Heather Koopman, Wayne E. McFee, Lori Schwacke, John Kucklick
Blubber has been used for decades to monitor the exposure of marine mammals to persistent organic pollutants (POPs). However, little is known regarding POP variability as a function of blubber depth and across the body of the animal. However, such sampling

Time-Resolved Infrared Studies of a Trimethylphosphine Model Derivative of [FeFe]-Hydrogenase

October 1, 2013
Author(s)
Edwin J. Heilweil, Christopher J. Stromberg, Melissa Johnson, James Thuman, Roger G. Letterman, Webster E. Charles
Model compounds that structurally mimic the hydrogen-producing active site of [FeFe] hydrogenases have been explored. In order to explore potential ground-state electronic structure effects on reaction mechanisms compared to hexacarbonyl derivatives, the

Using a Laser Tracker to Actively Coordinate the Motion of a 3m Industrial Robot to Within 50 Microns: An ongoing effort to accurately determine and correct positioning errors.

October 1, 2013
Author(s)
David R. Novotny, Joshua A. Gordon, Jason B. Coder, Jeffrey R. Guerrieri, Michael H. Francis
We are using industrial-grade robotics guided by a metrology-grade laser tracker to perform antenna calibrations at mmWave frequencies. We are using a 3 m-reach robot to spherically scan a milli-meter Wave (mmWave) probe around an antenna under test (AUT)
Displaying 37676 - 37700 of 143780
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