Physics

Physics of 'green waves' could make city traffic flow more smoothly

(Phys.org) —If you've been lucky enough to catch all the green lights as you drive down a busy street, you may have been benefiting from intentional synchronization called a "green wave." The green wave concept has been around in the US since the 1920s, but it doesn't always work as it should. When traffic gets backed up for some reason, "green wave breakdown" occurs.

Physicists help design, build cargo X-ray scanners

(Phys.org) —Two SLAC physicists with decades of particle accelerator experience helped a Silicon Valley company design and build X-ray devices that scan cargo containers for nuclear materials and other hazards. A version of this screening system is now in commercial use, and on May 16, the company received national recognition for its successful development from the federal Small Business Administration.

Theorists weigh in on where to hunt dark matter

(Phys.org) —Now that it looks like the hunt for the Higgs boson is over, particles of dark matter are at the top of the physics "Most Wanted" list. Dozens of experiments have been searching for them, but often come up with contradictory results.

New technique may open up an era of atomic-scale semiconductor devices

Researchers have developed a new technique for creating high-quality semiconductor thin films at the atomic scale -- meaning the films are only one atom thick. The technique can be used to create these thin films on a large scale, sufficient to coat wafers that are two inches wide, or larger.

Herschel Space Observatory Finds Mega Merger of Galaxies

A massive and rare merging of two galaxies has been spotted in images taken by the Herschel space observatory, a European Space Agency mission with important NASA participation.

NASA Announces Global Best in Class Winners for the International Space Apps Challenge

A panel of international judges from NASA, the European Space Agency (ESA), and other partner organizations has selected five "best in class" solutions as winners of the 2013 International Space Apps Challenge.

NASA Hosts Google+ Hangout with Recently Returned Space Station Astronauts

NASA will host a Google+ Hangout with the three recently returned International Space Station astronauts from 3-4 p.m. EDT on Thursday, May 23.

NASA Announces Global Best in Class Winners for the International Space Apps Challenge

A panel of international judges from NASA, the European Space Agency (ESA), and other partner organizations has selected five "best in class" solutions as winners of the 2013 International Space Apps Challenge.

NASA Hosts Google+ Hangout with Recently Returned Space Station Astronauts

NASA will host a Google+ Hangout with the three recently returned International Space Station astronauts from 3-4 p.m. EDT on Thursday, May 23.

New method for tailoring optical processors

Physicists and engineers have unveiled a robust new method for arranging metal nanoparticles in geometric patterns that can act as optical processors that transform incoming light signals into output of a different color.

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