Engineering

High-security identification that cannot be counterfeited

Try whispering at one end of the Echo Wall in the Temple of Heaven in Beijing. People at the far end of the curved wall will hear you from 65 meters away. This is the whispering-gallery effect. Now, researchers from Japan ...

Electronics & Semiconductors

'One-way' electronic devices enter the mainstream

Waves, whether they are light waves, sound waves, or any other kind, travel in the same manner in forward and reverse directions—this is known as the principle of reciprocity. If we could route waves in one direction only—breaking ...

Robotics

The robot that grips without touching

ETH Pioneer Fellow Marcel Schuck is developing a robotic gripper that can manipulate small and fragile objects without touching them. The technology is based on sound waves.

Engineering

Military researchers see non-lethal role for talking lasers

Say what? Laser plasma balls that can talk? The Pentagon? How, and for what? The answer is that instead of beaming a flashing light or shouting over a loudspeaker to keep people away from sensitive areas, new technology is ...

Security

When smartphone finger taps can lead to side channel attack

You type, hacker deciphers, your password is doomed. That is the grim scenario being discussed in a paper that is now on arXiv. "Hearing your touch: A new acoustic side channel on smartphones," is by authors Ilia Shumailov, ...

Engineering

Miniaturised pipe organ could aid medical imaging

A miniaturised version of a musical instrument that could be used to improve the quality of medical images has been manufactured by researchers at the University of Strathclyde.

page 1 from 2

Longitudinal wave

Longitudinal waves are waves that have same direction of oscillations or vibrations along or parallel to their direction of travel, which means that the oscillations of the medium (particle) is in the same direction or opposite direction as the motion of the wave. Mechanical longitudinal waves have been also referred to as compressional waves or compression waves.

This text uses material from Wikipedia, licensed under CC BY-SA