Physics

Sound bullets in water

Sound waves are commonly used in applications ranging from ultrasound imaging to hyperthermia therapy, in which high temperatures are induced, for example, in tumors to destroy them. In 2010, researchers at Caltech led by Chiara Daraio, a professor of aeronautics and applied physics, developed a nonlinear acoustic lens that can focus high-amplitude pressure pulses into compact "sound bullets." In that initial work, the scientists demonstrated how sound bullets form in solids. Now, they have done themselves one better, creating a device that can form and control those bullets in water.

Invisibility cloaking to shield floating objects from waves

A new approach to invisibility cloaking may one day be used at sea to shield floating objects – such as oil rigs and ships – from rough waves. Unlike most other cloaking techniques that rely on transformation optics, this one is based on the influence of the ocean floor’s topography on the various “layers” of ocean water.

Time asymmetry confirmed: Time's quantum arrow has a preferred direction

Digging through nearly 10 years of data from billions of BaBar particle collisions, researchers found that certain particle types change into one another much more often in one way than they do in the other, a violation of time reversal symmetry and confirmation that some subatomic processes have a preferred direction of time.

Inside the advanced photon source

To see inside Argonne's Advanced Photon Source (APS), all it takes is a little bit of light.

Time's quantum arrow has a preferred direction: BaBar experiment confirms time asymmetry

(Phys.org)—Time marches relentlessly forward for you and me; watch a movie in reverse, and you'll quickly see something is amiss. But from the point of view of a single, isolated particle, the passage of time looks the same in either direction. For instance, a movie of two particles scattering off of each other would look just as sensible in reverse – a concept known as time reversal symmetry.

NASA Announces Education Research Program Award Recipients

NASA has awarded $12.6 million to colleges and universities to conduct research and technology development in areas important to the agency’s mission.

NASA Announces Education Research Program Award Recipients

NASA has awarded $12.6 million to colleges and universities to conduct research and technology development in areas important to the agency’s mission.

NASA Extends Electrical Systems Engineering Services Contract

NASA has awarded a contract extension to MEI Technologies, Inc., of Houston for the Headquarters Electrical Systems Engineering Services (ESES) Interim contract.

International Space Station Astronauts Land Safely In Kazakhstan

Three members of the Expedition 33 crew undocked from the International Space Station and returned safely to Earth Sunday, wrapping up a mission lasting more than four months.

Homeless Planet Found Wandering Near Earth's Solar System

An artist's rendition of planet CFBDSIR2149. The planet's faint
glow looks blue through an infrared telescope. In visible
light the cold planet would actually appear red.
It's cold and young and massive. And they call it the wanderer.

Astronomers recently discovered a new planet, named CFBDSIR2149, that is relatively close to our solar system. It is also the first convincing evidence of an accepted but yet unsubstantiated theory of roaming planets.

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