Articles tagged with Acoustic Waves
Researchers create ultra-broadband sound absorber with an average absorption coefficient of 0.93, surpassing previous limitations. The metamaterial's design utilizes near-field non-locality to suppress excessive response and achieve efficient impedance matching.
Researchers have proposed a wearable, flexible scanner to enable patients to move naturally during brain scans. The technology uses photoacoustic imaging to visualize the cerebral cortex without the need for sedation or confined spaces.
Researchers developed a non-toxic, small-molecule probe that provides real-time visualization of disease progression, overcoming limitations of MRI and PET imaging. The probe binds copper ions and detects dysregulated levels, accurately identifying Wilson's disease and other maladies.
Researchers have discovered a new technique to locate the diffusion wake's signal in the quark-gluon plasma, a subatomic soup that flowed like a friction-free fluid after the Big Bang. This breakthrough may help scientists understand how matter emerged from this perfect fluid.
Researchers designed a tubular phononic crystal to sense biochemical and physical properties of liquids. The device demonstrates sensitivity to liquid density and speed of sound, making it suitable for sensing applications.
Scientists at ETH Zurich have developed a system that can manipulate the acoustic field in real time, creating illusions of objects disappearing or being simulated. The technology uses field-programmable gate arrays to control the augmentation of sound waves, enabling potential applications in sensor technology, architecture, and commu...
Researchers at NIST demonstrate a faster and more accurate way to calibrate microphones using lasers. The new technique surpasses the current industry standard, offering potential for commercial applications in industries like factories and power plants.
High-intensity focused ultrasound (HIFU) technology is being explored for its potential to destroy cancerous tumours while minimizing damage to healthy tissue. Researchers at the University of Waterloo have made significant progress in understanding how HIFU works on a cellular level, paving the way for future clinical trials.
Researchers at Duke University have developed a new approach to using sound waves to manipulate tiny particles suspended in liquid in complex ways. The 'shadow waveguide' technique creates a tightly confined, spatially complex acoustic field inside a chamber without requiring any interior structure.
Researchers found significant periodic flow velocity fluctuations in fuel injector ignite combustion oscillations, leading to high mechanical stress on the combustion chamber. The findings provide a reasonable answer for why these oscillations occur and have significant implications for preventing fatal damage in critical engines.
Scientists from Tokyo Metropolitan University have created a technology that allows objects to be lifted off reflective surfaces without physical contact using sound waves. They employed a hemispherical array of ultrasound transducers to generate a 3D acoustic field, stably trapping and lifting a small polystyrene ball.
Ashfaq Adnan's team uses 3D printing to create multilayered materials for smart helmets, absorbing impact energy and deflecting directed energy attacks. The resulting helmets will be lightweight and resistant to blast impacts, alerting soldiers to potential dangers.
Researchers at Harvard John A. Paulson School of Engineering and Applied Sciences have developed a technique to control and shape optical singularities, opening up possibilities for wide-ranging fields including super-resolution microscopy techniques and new atomic particle traps.
The study presents a phononic crystal that enables robust topological states at three dimensions, allowing for diverse wave steering applications. The researchers demonstrated the ability to engineer negative refraction of sound waves and utilize topological hinge states as transport channels.
Thermal waves have been observed in germanium at room temperature, a significant improvement in electronic devices performance. The discovery opens new possibilities for controlling heat through wave-like thermal transport.
Researchers at Duke University developed acoustoelectronic nanotweezers that control nanoparticles using sound-induced electric fields. This label-free, dynamically controllable method can be applied to various technologies, including biomedicine and condensed matter physics.
Scientists at the University of Rostock have made a groundbreaking discovery in the field of quantum mechanics. Localized light particles have been observed on long optical fibers, transcending the mechanism previously considered by Phil Anderson's theory of Anderson localization. This new class of disorder allows for the abrupt transp...
Researchers discovered non-reciprocal propagation in polarization-maintaining optical fibers due to ultrasound interaction. This phenomenon enhances sensing measurements and signal processing beyond the fiber's boundaries, opening new possibilities for advanced sensor networks.
Scientists have designed metamaterials that can produce rotons, quasiparticles that behave like free particles, without using quantum effects under normal conditions. These materials could enable the manipulation of sound waves in ways previously impossible, such as bouncing or redirecting them.
Scientists observe combined sound and light waves in atomically thin materials, finding that the hybrid wave can speed up and slow down spontaneously and split into two separate pulses. The discovery opens up new possibilities for optical communication through atomically thin layers.
Researchers discover moths have evolved acoustic metamaterials on their wings to absorb ultrasound, outsmarting bats. This adaptation decreases echo return and enhances insect survival, with scales tuned to different frequencies forming a broadband absorption array.
Researchers at Sandia National Laboratories have built the world's smallest acoustic amplifier, exceeding previous versions by over 10 times. The device uses sound waves to process radio signals, paving the way for smaller and more sophisticated wireless technology.
A collaborative research group successfully controlled the magnetization of a ferromagnetic thin film using circular vibrations of surface acoustic waves. The discovery opens up new possibilities for combining and developing acoustic and magnetic devices.
Researchers at Bar-Ilan University developed a novel solution combining light and ultrasound waves to create ultra-narrow filters in silicon integrated circuits. This innovation addresses the challenge of accommodating long delays required for narrowband filtering, enabling more efficient microwave photonic systems.
The Acoustical Society of America will host its 180th meeting online June 8-10, offering new features to ensure an exciting experience for attendees. The meeting will include prerecorded talks, live discussion sessions, panel discussions, and lightning round sessions.
Researchers found bats map the world in units of time, perceiving insects as nine milliseconds away, not meters. This constant sense allows bats to orient themselves without calculating distance based on sound speed.
A team of engineers is exploring new methods to focus ultrasound waves through the skull, offering a safer and less expensive alternative to MRI technology. The researchers are also investigating how vibrations and waves across different frequencies can be used to extract information from or focus energy on the brain.
Researchers used asteroseismology to measure the spin of older stars, finding they rotate faster than predicted by magnetic braking theories. The study provides new insights into the weakening effects of magnetic braking on older stars.
Researchers at the University of Oregon have developed a method to manipulate sound waves in synthetic composite structures known as metamaterials. The discovery uses theoretical and computational analysis of mechanical vibrations of thin elastic plates to dynamically stop and reverse sound pulses.
Researchers at POSTECH have designed a metasurface that can control acoustic and elastic waves, achieving underwater stealth capability untraceable by SONAR. The technology also enables drastic alteration of wave propagation through curved plates, such as vibrations.
Researchers at Washington State University have created hexagonal diamonds using sound waves, finding them stiffer than natural cubic diamonds. The discovery could lead to the development of superior materials for machining and drilling, potentially replacing traditional diamond in these industries.
Researchers from Tomsk Polytechnic University and colleagues have experimentally proven the existence of a two-dimensional curved flux of plasmonic quasiparticles, a plasmonic hook. The flat 2D hook possesses new properties, making it a promising transmitter for high-speed microoptical circuits.
Researchers at NIST developed a method using encounter metrics to measure interactions between individuals, promoting user anonymity. The system uses encrypted encounter IDs and ultrasonic ranging for accurate distance measurement, potentially slowing the spread of future pandemics.
Researchers successfully demonstrated a new methodology for direct near-field optical imaging of acoustic graphene plasmon fields. This strategy will provide a breakthrough for the practical applications of acoustic graphene plasmon platforms in next-generation optoelectronic devices.
A multidisciplinary research team has built nanoscale bubbles with customizable outer shells that can travel to and penetrate inaccessible areas in the human body. The breakthrough enables clearer ultrasound images and potentially improved disease detection and targeted drug delivery.
A new study assesses the dynamics of positron acoustic waves in electron-positron-ion plasmas under magnetic fields, finding compressive and rarefactive solitary waves. The team's results provide insight into magnetoplasma behavior in astrophysical contexts, such as solar winds and auroral acceleration regions.
Research reveals that brain hemispheres synchronize gamma waves to integrate auditory information, enabling us to hear a unified speech sound. Electric stimulation disrupts this synchronization, impairing the integration process and potentially leading to tinnitus.
Researchers perform an experiment that adds or subtracts a single phonon to a high-frequency sound field using laser light interactions. The team's findings show that subtracting a single phonon increases the average number of quanta, defying intuition. This result opens a new path for quantum science and technology with sound waves.
Researchers at Duke University have created a new method to concentrate and separate nanoparticles using sound waves, working in under a minute instead of traditional centrifugation methods which take hours or days. The technique can be used for precision bioassays, cancer diagnosis, and more.
Researchers have developed a noninvasive method to measure the stiffness of tissues within the brain's gray and white matter, which can reveal clues about traumatic brain injuries. The new technique, known as waveguide elastography, merges acoustic imaging methods and algorithms to provide diagnostic insights.
Researchers have developed an acoustofluidic process that can isolate sperm with normal head morphology and high DNA integrity from raw semen samples. The device selects over 60,000 high-quality sperm in under 50 minutes, providing a clinically-relevant number for IVF and ICSI.
MIT physicists create a perfect fluid in the laboratory, capturing its sound waves to measure viscosity. The results confirm that strongly interacting fermion gas behaves as a perfect fluid, with properties applicable to studying neutron stars and the early universe's plasma.
High-frequency sound waves revolutionize ultrasound-driven chemistry, enabling the development of innovative biomedical technologies and advanced materials. Researchers can deliver drugs to the lungs for painless vaccinations and create protective nanoparticles using patented nebulisation technology.
The NSF's National Solar Observatory has predicted the arrival of a large sunspot on November 18, coinciding with Thanksgiving. The prediction uses helioseismology to detect changes in sound waves from the Sun's interior and is valuable for understanding space weather effects.
Researchers discovered the precise construction of moths wings that enable extraordinary ultrasound-absorptive properties, creating a resonant absorber 100 times thinner than sound wavelength. This breakthrough inspires the design of ultra-thin sound absorbers for homes and offices.
The University of Arizona College of Engineering professor has received a $1.82 million grant to improve the sensitivity and portability of her FLOWER technology, which detects ultra-low levels of disease particles, contaminants, and performance-enhancing drugs.
Researchers from the Institute of Industrial Science, the University of Tokyo, have demonstrated a new cooling solution for nanostructured devices using surface waves. Surface phonon-polaritons (SPhPs) enhance thermal conductivity in thin membranes, improving heat transport beyond conventional acoustic phonon limitations.
Researchers found the upper limit for the speed of sound to be around 36 km per second, which is faster than previously thought. This discovery has implications for various scientific fields, including materials science and condensed matter physics.
A broadband graphene detector has been created to reveal the polarization of terahertz radiation. The device relies on plasma wave interference and has potential applications in next-generation information transmission systems and medical diagnostics.
Scientists have found that part of the acoustic energy released from a solar flare emanated from about 1,000 kilometers beneath the solar surface, suggesting that flares can create seismic activity. This discovery may lead to the development of a new method to forecast the size and severity of solar flares.
Researchers at Duke University demonstrate prototypes for acoustic tweezers that use sound waves to manipulate bioparticles in Petri dishes. The technology has the potential to bridge the gap between academia and industry, enabling a wider range of laboratories to adopt it.
Scientists at Princeton Plasma Physics Laboratory have found a novel electrical current that could stabilize fusion reactions, contrary to conventional notions. The discovery sheds light on the fundamental interactions of waves in plasma and has implications for creating fusion energy.
Researchers at the Institute for Basic Science found that audible sound can control chemical reactions in solution by supplying energy sources into the air-liquid interface. The study created aesthetically pleasing patterns on the surface and bulk of the solution, exhibiting life-like behavior in synthetic molecules.
Researchers have demonstrated strong topological order for sound stemming from time modulations, allowing robust propagation along boundaries of topological metamaterials. This advancement enables cheaper, lighter devices with reduced battery power consumption, suitable for harsh environments.
Scientists combine piezoelectric aluminium nitride with ultralow-loss silicon nitride integrated photonics to create a hybrid circuit for on-chip acousto-optic modulation. The technology enables wideband actuation with ultralow electrical power, opening up new possibilities for precision-demanding applications.
A recent study confirms theories developed by physicists over the last two centuries, showing the Earth's atmosphere vibrates like a bell. The study analyzed atmospheric pressure data for 38 years, revealing dozens of predicted wave modes, matching theory well.
A team of researchers used X-ray measurements to study the behavior of waves in granular materials. The findings provide a better understanding of how particle arrangements and forces affect wave propagation. This knowledge is crucial for detecting earthquakes, locating oil and gas reservoirs, and designing acoustic insulation.
Researchers from UNIGE developed a computational model that reproduces the brain's mechanism for analyzing spoken language. The model uses predictive coding to optimize perception by constantly trying to predict sensory signals. It has successfully recognized thousands of syllables in hundreds of sentences, validating the idea that neu...
Dr. Ying-Tsong Lin, the 12th person in history to visit Challenger Deep, is an acoustic scientist studying sound propagation in the ocean. His research aims to improve acoustic communication and geo-location at extreme depths.
Scientists studied sunspots and their movement, discovering a giant cell in each hemisphere with plasma moving towards the equator at 15 km/h. The meridional flow explains why sunspots emerge closer to the equator as solar cycles progress.