News tagged with acoustic

Bottling up sound waves

There's a new wave of sound on the horizon carrying with it a broad scope of tantalizing potential applications, including advanced ultrasonic imaging and therapy, acoustic cloaking, and levitation and particle ...

Aug 04, 2014
4.3 / 5 (11) 1

How do liquid foams block sound?

Liquid foams have a remarkable property: they completely block the transmission of sound over a wide range of frequencies. CNRS physicists working in collaboration with teams from Paris Diderot and Rennes ...

Apr 24, 2014
4.7 / 5 (7) 2

Scientists twist sound with metamaterials

A Chinese-U.S. research team is exploring the use of metamaterials—artificial materials engineered to have exotic properties not found in nature—to create devices that manipulate sound in versatile and ...

Feb 25, 2014
4.5 / 5 (8) 1

Designing an acoustic diode

Most people know about ultrasound through its role in prenatal imaging: those grainy, grey outlines of junior constructed from reflected sound waves. A new technology called an "acoustic diode," envisioned ...

Nov 01, 2013
4.4 / 5 (20) 0 | with audio podcast

Using sound waves for bomb detection

(Phys.org) —A remote acoustic detection system designed to identify homemade bombs can determine the difference between those that contain low-yield and high-yield explosives.

Oct 23, 2013
3.7 / 5 (3) 0 | with audio podcast

A unique glance into the Sun's atmosphere

Three months after the flight of the balloon-borne solar observatory Sunrise, scientists from the Max Planck Institute for Solar System Research (MPS) in Germany now present unique insights into the central ...

Sep 25, 2013
5 / 5 (6) 3 | with audio podcast

Clot-dissolving bubbles to treat strokes?

(Medical Xpress)—Researchers are using computer simulations to investigate how ultrasound and tiny bubbles injected into the bloodstream might break up blood clots, limiting the damage caused by a stroke ...

Sep 25, 2013
4.7 / 5 (3) 0 | with audio podcast

A layer of tiny grains can slow sound waves

In some ways, granular material—such as a pile of sand—can behave much like a crystal, with its close-packed grains mimicking the precise, orderly arrangement of crystalline atoms. Now researchers at ...

Aug 05, 2013
5 / 5 (2) 2 | with audio podcast

Military sonar can alter blue whale behavior

Some blue whales off the coast of California change their behavior when exposed to the sort of underwater sounds used during U.S. military exercises. The whales may alter diving behavior or temporarily avoid ...

Jul 03, 2013
4.2 / 5 (6) 2 | with audio podcast