Birds create songs by moving muscles in their vocal organs to vibrate air passing through their tissues, and new research shows that these muscles act in concert to create sound. Scientists describe how zebra finches produce songs in this week's Chaos. Using electromyographic signals, they tracked the activity of one muscle involved in creating sound, the syringealis ventralis. They then used the data from this muscle to create a synthetic zebra finch song.
Engineers at Duke University have developed a way to manipulate, split and mix droplets of biological fluids by having them surf on acoustic waves in oil. The technology could form the basis of a small-scale, programmable, rewritable biomedical chip that is completely reusable for disparate purposes from on-site diagnostics to laboratory-based research.
At the 96th General Session of the International Association for Dental Research (IADR), held in conjunction with the IADR Pan European Regional (PER) Congress, Jesse Jokerst, University of California, San Diego, USA gave an oral presentation titled 'Non-Invasive, Ultrasound-based Approach for Pocket Depth Measurements.'
Understanding gas flames' response to acoustic perturbations at high pressure should make next-generation turbines safer and more efficient.
Researchers at TU Wien are developing methods for manipulating waves in a targeted manner, so that they can move forward with almost no restriction. This method has now been implemented in an experiment. Using precisely controlled loudspeakers, it has been possible to send a sound wave through a tube containing various obstacles. Technologies like this could enable light waves to be manipulated and objects to be made invisible.
EPFL researchers have found a way to make materials that are normally opaque to sound waves completely transparent. Their system involves placing acoustic relays at strategic locations so that sound waves can propagate at a constant amplitude -- regardless of what may lie in their path. This method could eventually be used to make it possible to hide objects like submarines.
A discovery by scientists at the Department of Energy's Oak Ridge National Laboratory supports a century-old theory by Albert Einstein that explains how heat moves through everything from travel mugs to engine parts.
New research by UC San Francisco scientists reveals what area of the human brain controls the vocal folds of the larynx, or voice box, to let us control the pitch of our speech. Insights into pitch control could pave the way for advanced brain prosthetics that could allow people who can't speak to express themselves in a naturalistic way.
Researchers have developed a device that reflects sound in the direction it came from, rather than deflecting it at an angle. The 'retroreflector' can reflect sound across an operating range of 70 degrees in either direction -- more than doubling the effective range of previous technologies.
As part of ongoing acoustic research at Binghamton University, State University at New York Distinguished Professor Ron Miles has created a workable sensor with the least possible resistance to motion.