Articles tagged with Acoustic Waves
Researchers at MIT are exploring a new method to measure hurricane strength using underwater microphones, which could lead to cheaper early-warning systems. The approach was validated by measurements from Hurricane Gert in 1999, providing accurate results comparable to aircraft-based methods.
A new imaging technique helps demystify the cause of explosive sound waves in rockets, revealing spinning acoustic waves that gain destructive power as they rotate around the combustion chamber. The study provides a clearer understanding of this phenomenon and brings scientists closer to preventing its occurrence.
A new study contradicts a prevailing belief about otoacoustic emissions, revealing they travel through fluid in the inner ear rather than rippling along the basilar membrane. The findings offer insight into hearing loss and could lead to the development of tools to detect damage.
Researchers at Duke University have successfully created a three-dimensional sound cloak in theory, allowing sound waves to travel around it undistorted. This breakthrough could lead to improved acoustics in concert halls and hidden submarines from sonar detection.
Researchers at the University of Liverpool have developed a mathematical model that proves it is possible to gain full control of sound waves using meta-materials. This could lead to improved medical scans, such as ultrasound technology used in pregnancy tests, and quieter noisy machines by trapping sound.
Scientists have discovered that sound waves can trigger earthquakes in a laboratory setting, inducing aftershocks long after the initial quake. This finding has significant implications for understanding earthquake behavior and may provide clues to catastrophic events in other granular media.
A team of researchers at Duke University has successfully transferred encoded information from a laser beam to sound waves and back again, opening the door for ultra-fast optical communications networks. The new method uses stimulated Brillouin scattering to create acoustic vibrations that can retain data for brief intervals.
Hinode satellite data sheds light on sun's magnetic field and solar wind formation, revealing Alfvén waves play a critical role in driving the solar wind. Magnetic reconnection and convective motions also contribute to its creation.
Scientists create a functional radio system utilizing a tiny carbon nanotube detector, marking a significant milestone in the evolution of nano-electronics. The device enables wireless transmission of classical music wirelessly from an iPod to a speaker.
Researchers at St. Jude Children's Research Hospital have solved the long-standing mystery of how mammalian ears amplify sound, concluding that movement of cilia atop hair cells dominates response in non-mammals but somatic motility drives amplification in mammals.
Scientists have developed a new technique to measure the speed of nuclei traveling at one-third the speed of light, enabling the study of rare isotopes. The method uses the Doppler effect to calculate the nucleus's speed based on gamma ray emissions.
Researchers at UNH have successfully proven the existence of a new type of electron wave on metal surfaces called acoustic surface plasmons. This discovery has significant implications for various fields including nano-optics, high-temperature superconductors, and chemical reactions on surfaces.
A magnitude 7.8 earthquake triggered a slow-rupturing tsunami with unexpectedly high wave heights, catching lifeguards off guard and claiming over 600 lives in Java, Indonesia. The study highlights the limitations of traditional warning systems for tsunami events near earthquakes.
Researchers at Brown University have successfully captured the motion of a single electron in liquid helium using sound waves. The images show electrons moving through the fluid in snakelike paths, which are believed to be following vortex lines - a phenomenon akin to a tornado in superfluids.
The study reveals that the Sun's magnetic field allows the release of wave energy from its interior, enabling sound waves to travel through fountains into the solar chromosphere. This discovery sheds light on why the chromosphere is hotter than the star's surface and has significant implications for climate variability.
Dr. George Papanicolaou was chosen for his significant contributions to mathematics and its applications, including imaging in random media and financial mathematics.
The USC/Duke team has made significant improvements in controlling light pulses, achieving a slowdown of up to 20-fold increase over previous methods. By using a simple optical fiber and exploiting the Brillouin effect, they can potentially accommodate higher data rates and enable more efficient processing with photonics.
Researchers developed an ultrasonic metamaterial that captures sound wave's fine details and expands instead of compresses like natural materials. This allows for higher modulation of the acoustic wave, enabling better ultrasound image resolution.
Devices called PALs can detect sounds coming from ships, whales, volcanic eruptions, rainfall, and breaking waves. By analyzing these sound sources by frequency, researchers can create a 'sound budget' that helps establish noise regulations for different ecosystems.
Researchers discovered faint visible 'echoes' of three ancient supernovae by detecting centuries-old light reflected by interstellar gas clouds. The oldest echo is likely over 600 years old, offering a chance to study famous supernovae like those observed in 1006 and 400 years ago.
Researchers will use fMRI technology to map brain regions active during speech and language tasks in healthy subjects, with data from stroke patients used to correlate language deficits with damage to specific brain areas.
A new system can predict the total magnitude of an earthquake within seconds, allowing for tens of seconds of warning. This allows for critical actions such as shutting down power grids and evacuating buildings, potentially saving lives and reducing damage.
Researchers have developed a new sensor based on a human organ that can detect specific frequencies of sound waves. The device, which is a microelectromechanical system, has three main benefits over existing artificial cochlea designs: mass production potential, comparable size, and efficiency.
Researchers suggest that high winds over rough terrain can generate acoustic waves that heat the atmosphere at prodigious rates. These waves could account for mysterious 'hotspots' observed above the Andes and Rocky Mountains.
Researchers found a dramatic change in electrical conductivity at 60 kilometers below the ocean floor, with sound waves traveling rapidly above and slowly below. This discovery sheds new light on the process of forming oceanic crust at mid-ocean ridges.
Scientists have detected geoneutrinos using the KamLAND detector, providing crude information about the chemistry of uranium and thorium isotopes. This detection offers a new window into the Earth's interior, doubling the number of tools available for studying the planet's composition and structure.
Scientists captured T waves from the Sumatra earthquake using underwater microphones at Diego Garcia, providing a direct look at the entirety of the large underwater event. The study reveals two phases: faster rupture to the south and slower to the north, with implications for tsunami risk and emergency relief.
Researchers at Purdue University have confirmed findings by Rusi Taleyarkhan, using a tabletop device to produce nuclear fusion reactions through the use of ultrasound. The experiment produced neutrons in the range of 2.5 MeV and tritium, providing evidence for thermonuclear fusion.
Researchers have discovered the inverse Doppler effect, a phenomenon where electromagnetic waves compress and expand, leading to new advances in optics and communications equipment. This discovery challenges the basic laws of nature and could lead to breakthroughs in material engineering.
A new underwater listening device has been developed by Boston University engineers using off-the-shelf hardware, combining sophisticated engineering to create a highly sensitive device. The array can be towed behind small craft, making it easier to launch, and is less expensive than current multi-million dollar systems.
Scientists have discovered a subset of learning disabilities resulting from a dysfunction in the brainstem's encoding of basic sounds of speech. BioMAP, a simple neurophysiological test, can identify children with sound processing disorders and improve their speech discrimination skills through auditory training.
Nayfeh has made significant contributions to the field of nonlinear dynamics, including developing a new methodology for controlling ship motions and analyzing acoustic waves in aircraft engine-duct systems. His work has improved the understanding of complex phenomena such as subharmonic and superharmonic resonances in ships and boats.
A Texas A&M University professor has developed a detailed wave prediction system that provides forecasts for two days ahead. The system uses data from NOAA and complex mathematical models to predict wave conditions, including height and timing.
The SDSS team detected ripples in the galaxy distribution made by sound waves, providing evidence that galaxies grew via gravity. The findings support the standard cosmological model and provide insights into dark matter and dark energy's properties.
Researchers at Los Alamos National Laboratory have discovered a rare state of matter, Bose-Einstein condensation (BEC), in the ancient pigment Han Purple when subjected to intense magnetic fields. This finding represents a significant breakthrough in quantum physics and has implications for advanced computing technologies.
Researchers have designed a traveling-wave engine that converts 18% of heat source energy into electricity, outperforming current thermoelectric devices. The device's high reliability and efficient energy conversion make it suitable for deep space probes.
Dr. Arthur Anker's research on alpheidae, a diverse family of snapping shrimp, has led to the discovery of two new species: Automate hayashii from Hokkaido, Japan, and Bermudacaris australiensis off Western Australia. These finds expand our understanding of this unique family's range and ecological diversity.
Researchers studied beaked whale responses to sound frequencies and decibel levels, revealing overestimated deep water impacts and new insights into shallow water reverberations. The study aims to improve safety guidelines for seismic operations in U.S. waters.
Researchers develop a new technology using low-frequency wide band Rayleigh waves to detect cracks in rails at high speeds. This technique could transform every train in the country into part of a 24-hour network of rail crack detectors.
Time-reversal acoustics (TRA) systems hold promise for precise medical imaging, diagnostic techniques, and incision-free surgical methods. TRA's ability to focus sound waves accurately in dense environments makes it an attractive solution for imaging the human body or targeting tumors non-surgically.
Researchers have developed a system that can alter pitch, duration, and vibrato in singing voices, producing more professional-sounding renditions. The technology uses a sinusoidal model to break down the original voice into components that can be modified to produce a great singing voice.
Researchers discovered that fusiform cells in the cochlear nucleus integrate acoustic information with head and ear position information to pinpoint sound sources. The study found that synapses transmitting acoustic information are stable, while those carrying head and ear position information exhibit plasticity.
The MIT model provides predictive capabilities for understanding defect nucleation and growth, crucial for nanotechnology. It explains how defects like cracks or dislocations develop from waves in four stages, providing a key finding for materials science.
Researchers Deane and Stokes developed a new depiction of bubble sizes and creation processes using acoustical and optical observations. They found that bubble size distribution follows two distinct mechanisms, one for small and large bubbles.
Tiny, super-hot bubbles created by acoustic cavitation may be producing nuclear fusion, according to researchers. The experiment produced stable bubbles that could expand to nearly a millimeter before collapsing, and detected higher levels of tritium and neutrons.
Researchers analyzed sound waves from the Solar and Heliospheric Observatory to map the temperature and flow structure beneath sunspots. The study revealed fast-moving streams of hot plasma converging into a gigantic vortex that penetrates the solar surface.
Researchers Weaver and Lobkis developed a technique to measure the vibrations of an object's interior by analyzing ambient noise. By correlating patterns in the noise, they can extract information about the object's internal structure, offering new possibilities for non-invasive inspection and monitoring.
Researchers at Purdue University have created a mathematical model to analyze tire vibrations and identify the components that produce the most noise. The model, which creates a visual representation of the tire's vibration pattern like a fingerprint, will help engineers design quieter tires and reduce highway noise.
Scientists study seismic waves to understand tectonic plate dynamics, aiming to resolve the long-standing 'great plate debate'. They use data from seismometers worldwide to characterize wave origins and time delays, creating a X-ray image of the planet's internal structure.
Archaeologists may use sound waves to survey potential building sites for significant cultural artifacts. The high-resolution acoustic system can detect and image small buried objects, improving on current ground-penetrating radar methods that struggle with wet soils or non-metallic objects.
Researchers from the University of Pennsylvania discovered that carbon nanotubes can conduct heat exceptionally well, potentially addressing overheating issues in microchips. The discovery could lead to applications in various fields, including electric motors and aircraft components.
Researchers suggest using ultrasound and audible sound waves to measure eye fluid pressure. This could enable glaucoma patients to monitor changes in pressure, taking medication accordingly.
Dr. Robert Pinkel, a leading researcher in acoustical oceanography, has received the prestigious Walter Munk Award for his groundbreaking contributions to Doppler methods and sector scan sonar technology. His work has significantly advanced our understanding of small-scale ocean structure.
Physicists at Northwestern University have demonstrated that superfluid helium-3 can conduct sound waves transversely, a property previously observed in solids. This discovery provides conclusive proof of the existence of transverse sound waves in liquid helium-3 and opens up new possibilities for studying its internal structure.
Sandia National Laboratories' tiny acoustic wave sensors can detect specific chemicals in the environment and alert people to potential hazards. The sensors, similar to a 'canary in a mine,' are part of a hand-held chemical detection system called 'chem lab on a chip.'
Researchers will gather at a record-breaking acoustics meeting to discuss topics including the dangers of noise-induced hearing loss in day-care centers and the potential for thermacoustic refrigerators to create musical tones. The event features over 1,950 abstracts submitted by scientists from 44 countries.
Researchers at Carnegie Institution use X-ray diffraction to determine iron's elasticity at high pressures, which could explain seismic anisotropy in the inner core. The findings suggest the inner core is close to melting and may contain additional components with low shear-wave velocities.
Researchers at Brown University have discovered that bats can resolve sonar images with a higher quality and wider variety of orientation tasks than previously thought. Bats can process overlapping echo delays as little as two microseconds apart, resolving objects as close together as three-tenths of a millimeter.
Researchers are developing a magnetic hearing aid that uses an electromagnetic coil to stimulate the inner ear via the round window, potentially enhancing speech and reducing background noise. The device could reduce or eliminate acoustic feedback, a common issue with conventional hearing aids.
The Aurex-3 device uses a vibrating probe to cancel out ringing sounds in the ear, offering long-term benefits without interfering with hearing. Developed by ADM Tronics, the device employs beat harmonics to effectively mask tinnitus symptoms.