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Displaying 25801 - 25825 of 73969

Synthetic Electric and Magnetic Fields for Ultracold Neutral Atoms

January 1, 2011
Author(s)
William D. Phillips, Yu-Ju Lin, Robert L. Compton, Karina K. Jimenez Garcia, Abigail R. Perry, James V. Porto, Ian B. Spielman
We use Raman coupling between magnetic sublevels of a 87Rb Bose-Einstein condensate (BEC) to create an effective vector gauge field for the neutral atoms. They behave as if they were charged particles in a magnetic vector potential. With appropriate

Urban trees and the risk of poor birth outcomes

January 1, 2011
Author(s)
Geoffrey Donovan, Yvonne Michael, David Butry, Amy Sullivan, John Chase
This paper investigated whether greater tree-canopy cover is associated with reduced risk of poor birth outcomes in Portland, Oregon. Residential addresses were geocoded and linked to classified-aerial imagery to calculate percentage tree canopy in 50, 100

Defining Common Reference Channels for Geostationary Infrared Imagers

December 31, 2010
Author(s)
Tim Hewison, Ruediger Kessel
This article follows up the theoretical considerations presented above with an example applied to the infrared channels of geostationary imagers. The uncertainties, u(deltaLr), introduced by the process of spectral conversion to Common Reference Channels

Evaluating self-declared ancestry of U.S. Americans using autosomal, Y-chromosomal and mitochondrial DNA

December 31, 2010
Author(s)
Peter Vallone, Oscar Leo, Manfred Kayser, Mannis van Oven, Michael Coble, Toni M. Diegoli, Kristiaan J. van der Gaag, Peter D. Knijff
The current U.S. population represents an amalgam of individuals from different biogeographic ancestries who arrived on the territory at different times in the history of the territory. However, such admixture is far from being homogeneous and this fact

Time-resolved radiation beam profiles in water obtained by ultrasonic tomography

December 31, 2010
Author(s)
Eugene Malyarenko, Joseph Heyman, Heather H. Chen-Mayer, Ronald Tosh
This paper presents a practical ultrasonic system for near real-time imaging of spatial temperature distributions in water caused by absorption of radiation. Initial testing with radiation from a highly attenuated infrared lamp demonstrates that the system
Displaying 25801 - 25825 of 73969
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