Ping! The popular 1990 film, The Hunt for Red October, helped introduce sonar technology on submarines to pop culture. Now, nearly 30 years later, a team of scientists at the University of Missouri is using this same sonar technology as inspiration to develop a rapid, inexpensive way to determine whether the drinking water is safe to consume. Based on their results, the scientists said they can determine changes in the physical properties of liquids.
Under certain circumstances, a wave can split into several paths, reaching some places with high intensity, while avoiding others almost completely. This kind of 'branched flow' has first been observed in 2001. Scientists at TU Wien (Vienna) have now developed a method to exploit this effect. The core idea of this new approach is to send a wave signal exclusively along one single pre-selected branch, such that the wave is hardly noticeable anywhere else.
Video cameras continue to gain widespread use, but there are privacy and environmental limitations in how well they work. Acoustical waves are an alternative medium that may bypass those limitations. Unlike electromagnetic waves, acoustical waves can be used to find objects and also identify them. As described in a new paper in Applied Physics Letters, the researchers used a 2D acoustic array and convolutional neural networks to detect and analyze the sounds of human activity.
Researchers have used sound waves to precisely manipulate atoms and molecules, accelerating the sustainable production of breakthrough smart materials. Metal-organic frameworks (MOFs) are versatile and porous nanomaterials that can be used to store, separate, release or protect almost anything, but the traditional process for creating them is environmentally unsustainable and time-consuming. Scientists have now demonstrated a clean, green technique that can produce a customized MOF in minutes, by harnessing the power of sound.
Acoustics consultant Klaus Genuit says that new ISO guidelines for defining, measuring and evaluating soundscapes are a big step forward in guiding the creation of audibly fine restaurants. 'A soup might be delicious or not, but you can't answer this by knowing the temperature of the soup. It is the same with restaurant soundscapes -- you need a lot more information than just noise level,' he said.
Current treatments of type 2 diabetes can help the body use insulin at various stages of the disease, but they can also be expensive and subject patients to lifelong medication regimens and side effects. Thanks to new therapeutic ultrasound technology, one promising alternative looks to reshape how early type 2 diabetes is managed. A group of researchers has used ultrasound therapy to stimulate insulin release from mice on demand.
Every year, bald and golden eagles are killed when they inadvertently fly into wind turbine blades. One possible way to prevent these deaths is to chase the birds away with acoustic signals. To determine what types of sounds are most effective in deterring the birds, researchers tested the behavioral responses of bald eagles to a battery of both natural and synthetic acoustic stimuli.
Referees and others using whistles on the job need a simple way to determine whether it's harmful to their hearing, so researchers set out to put it to the test and to provide some clarity and damage risk criteria for impulse noise exposures. To do this, the group carefully measured and analyzed the acoustic signature of 13 brands of whistles identified as the 'most commonly used' by 300 sports officials -- both indoors and outdoors.
Screaming is well-studied in animals, but much less is known about how human screams function in communication, or how similar or different human screams are from those of other species. To help unlock the secrets of human screaming, researchers at Emory University have studied human vocal sounds, representing a broad acoustical range and array of emotional contexts, and studied what makes a sound a scream or not.
Wind turbines are a critical component in the strategy for energy independence, but these massive structures are also killing bats. Now, researchers from Texas A&M University are exploring a unique passive acoustic whistle mounted on turbine blades to warn bats of the deadly turbines using a sound they can easily hear and recognize. They will present the team's research findings at the 177th ASA Meeting.