Streams of sound are now all you need to make objects dance in the air and combine. A levitation device is the first to use high-frequency sound waves to bring together floating particles and liquid droplets. In principle, the technique could even levitate a person or animal although its not strong enough yet.
For now, such hands-free control could be used to study chemical reactions in extreme environments, to move hazardous materials and to simulate the low-gravity environment of space. At 24 kilohertz, the waves are too high-pitched to be audible to humans but can be heard by some animals, including cats, bats and mice.
Other levitation methods use magnets or electrical fields, making mag-lev trains and even levitating frogs possible. But in these cases, the levitated objects must have particular magnetic or electrical properties.
Acoustic levitation imposes no such constraints. It can, in principle, float anything, says Dimos Poulikakos of the Swiss Federal Institute of Technology (ETH) in Zurich, Switzerland.
A sound wave is a pressure wave that produces a force and so has the potential to counteract gravity. To float things using sound, you need to ensure the force remains constant in a particular point in space.
This has been done previously, by using speakers or other resonators to fire pressure waves upwards and bounce them off a reflector. The original waves and their reflections then combine to create a standing wave, with a series of stationary "nodes" that stay put even as the wave oscillates.
If the standing wave has the right frequency, the force at these nodes exactly cancels gravity and anything trapped there hovers in place.
"Scientists at Argonne National Laboratory have discovered a way to use sound waves to levitate individual droplets of solutions containing different pharmaceuticals. While the connection between levitation and drug development may not be immediately apparent, a special relationship emerges at the molecular level."
An Eye For Odin 2015-05-03 2:03
The Anglo-Saxon Sutton Hoo helmet is a religious artefact dedicated to Woden the one eyed god of war. Recent research indicates that numerous other archeaological artefacts also provide evidence that one eye on various figures has been deliberately removed as part of a Woden ritual.
Read the original essay by Neil Price and Paul Mortimer here:
Music: Faunus Amadeus Loki - Strange ...
"Sweden is ruled by unelected policy plotters" 2015-05-03 1:16
Editor's Comment: As usual, the power in Sweden is behind the scenes, unelected and weaved into the bureaucracy so that Swedes have no control or influence over what happens in the country.
Sweden has long been seen as the epitome of a healthy democracy. But in this week's debate article, three researchers argue that an increase in unelected behind-the-scenes operators is ...
Israel to airlift 25 babies born to surrogates out of Nepal 2015-05-03 1:46 Ya'ari is one of 26 babies airlifted by the Israeli government and brought to Israel to be with their parents after the Nepal earthquake. (Derek Stoffel/CBC)Israel said Sunday it plans to airlift 25 infants from quake-hit Nepal born to surrogate mothers, along with their Israeli parents, most of them homosexual couples.
Officials said Israel was sending a military delegation to offer ...
Ed Miliband is a f****** communist, says Noel Gallagher 2015-05-02 3:38
Noel Gallagher has warned Ed Miliband is a 'f******* communist' who will 'fail us all' if Labour wins the election next week.
The former Oasis guitarist admitted that he did not plan to vote on Thursday because he could not 'get behind' any of the parties.
His foul-mouthed outburst at Mr Miliband is a long way from New Labour's Cool Brittania heyday, ...