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Highlights of major physics conference in Washington, D.C.
Date:2/13/2010

sentations given at several scientific meetings. At the APS meeting, for example, Session X4 explores the impact of lasers on precision measurements. One talk will recount the invention of the original 1960 ruby laser. Another will look at frequency comb metrology, a technique that measures laser wavelengths with high precision. A third looks at quantum cascade lasers, which metaphorically put electrons in a barrel and send them over a series of waterfalls. Instead of recombining with holes to create one photon per electron, as in conventional semiconductor lasers, electrons in a QC laser pass through a succession of closely coordinated quantum wells -- sandwiches of semiconductor layers -- and unload energy as they go in the form of one photon per stage in the stack. (Session X4, http://meetings.aps.org/Meeting/APR10/SessionIndex3/?SessionEventID=116197).

7) SOUNDS OF THE LITTLE BANG

Particle accelerators at Brookhaven National Laboratory and CERN that collide large nuclei, like gold or lead, create very small systems with densities and temperatures similar to that of the universe when it was a microsecond old. These collisions produce a small speck of matter through which acoustic waves can propagate. Agnes Mocsy (Pratt Institute) will present an analysis of the acoustic signatures left over from these relativistic high-energy collisions. By shifting the frequencies to an audible range she will allow the audience to hear the evolution of these little bangs created in the laboratory. This is the first time relativistic particle collisions have been presented as a sound. (Talk Y14.7, http://meetings.aps.org/Meeting/APR10/Event/115984)

8) USING SUNLIGHT TO RECYCLE CARBON DIOXIDE

Every year factories across the world pump some 10 billion tons of carbon dioxide into the atmosp
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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