USC researchers created a new sharkskin-inspired smart material that allows shifts in acoustic transmission on demand using magnets. As a result the new material can achieve multiple properties in one structure by switching between states, for example transmitting and also damping external noise transmission in a submarine through a single device. This smart material can recreate properties intrinsic to electronic devices such as switches, thus showing promise of smart sound transmission--a sound "computer."
Researchers have demonstrated a new concept of optical fiber sensors that addresses a decades-long challenge: the distributed mapping of refractive index outside the cladding of standard fiber, where light does not reach. The sensor can be used for leak detection in critical infrastructure, and process monitoring in the petrochemical industry, desalination plants, food and beverage production and more.
The ocean is getting too loud even for crabs. Normally, shore crabs (Carcinus maenas) can slowly change their shell color to blend in with the rocky shore, but recent findings show that prolonged exposure to the sounds of ships weakens their camouflaging powers and leaves them more open to attack. The work, appearing March 9 in the journal Current Biology, illustrates how man-made undersea noise can turn shore crabs into sitting ducks for predators.
Scientists from the Hong Kong University of Science and Technology (HKUST) have realized what they called a virtualized acoustic metamaterial, in digitizing material response to an impulse response stored in a software program.
Working in an emerging field known to as 'spacetime-varying metamaterials,' University at Buffalo engineers have demonstrated the ability to break reciprocity in acoustic waves.
A concept known as 'fragile topology' has been puzzling physicists ever since it emerged two years ago. Two teams, one led by physicists at ETH Zurich, have now developed a comprehensive theoretical and experimental framework to pin down the essence of the concept -- and establish ways how to potentially harness it in applications.
Crystalline materials known as topological insulators conduct surface current perfectly, except when they don't. In two new studies published in the journal Science, Princeton researchers and their collaborators explain how these 'fragile' poorly conducting topological states form, and how conductivity can be restored.
Doctors have used focused ultrasound to destroy tumors without invasive surgery for some time. However, the therapeutic ultrasound used in clinics today indiscriminately damages cancer and healthy cells alike. Researchers have now developed a low-intensity ultrasound approach that exploits the properties of tumor cells to target them and provide a safer option. Their findings are a new step in oncotripsy, the singling out and killing of cancer cells based on their physical properties.
Microplastics suspended in water can be gathered using acoustic forces in microchannels. The bulk acoustic wave (BAW) device can be customized to gather microplastic fibers and particles of different sizes. When run in series and parallels, the device can successfully concentrate free floating microplastics in large amounts of water into very manageable quantities. This is a promising new technique to clean our laundry grey water before they are released into the environment.
So suggests a study that compares the behaviour of rodents and humans with respect to the detection rhythm, published in Journal of Comparative Psychology by Alexandre Celma-Miralles and Juan Manuel Toro, researchers at the Center for Brain and Cognition.