Articles tagged with Vibration
Researchers have found that exposure to vibrations from power tools can cause hand-arm vibration syndrome, a condition that leads to numbness, loss of dexterity, and discoloration in the extremities. A study by Concordia engineer Subhash Rakheja suggests that simple seat upgrades can reduce exposure by up to 60 percent.
A team from Vienna and Munich has developed a numerical solver to predict the design-limited damping of mechanical resonators, enabling the creation of more efficient devices. The solver uses quantum mechanics to calculate the radiation of phonons from the resonator, removing the need for trial and error prototype fabrication.
Researchers developed a virtual laboratory model to predict train vibrations, taking into account elasticity, density, and thickness of materials. The model was validated on the Madrid-Barcelona high speed line and will be applied to other rail facilities in future studies.
Antennal drumming behavior has been linked to development of social caste in a native paper wasp, Polistes fuscatus. The new work shows that exposure to simulated antennal drumming biases developing larvae toward the physiological characteristics of workers rather than gynes.
Male Schizococa ocreata wolf spiders adjust their signaling modes based on environment to increase mating chances. In natural habitats, vibrations on leaf litter were found to be significantly more effective than other substrates, leading to successful mating over 85% of the time.
Australian researchers found that as fatigue progresses, speech slows and variations in pitch increase, indicating a loss of control over the muscles producing speech. The study provides a novel method for analyzing the effects of fatigue on the central nervous system through acoustic analysis.
Researchers at EPFL have discovered an all-optical transistor that controls the flow of light using a novel optical microresonator. The device enables a strong 'control' laser to turn on or off a weaker 'probe' laser, opening up new possibilities for telecommunications and photonics.
Researchers studied the closest living relative of tetrapods, the African lungfish, and found that they lack sensitivity to airborne sound. The inner ear's structure suggests a high vibration sensitivity but limits hearing to very low frequencies, implying that early tetrapod ancestors were probably deaf to airborne sound.
Researchers found daily whole body vibration improves bone density around the hip joint and femur, reducing a biomarker of bone breakdown. The technique also stimulates stem cells to differentiate into bone cells, potentially aiding fracture healing. Vibration has shown promise in improving glucose uptake and reducing fatty liver disease.
Researchers have developed a web portal that allows seismologists to study noise for analyzing the Earth's structure, leading to better understanding of earthquakes. The system enables smaller groups to perform complex analysis previously limited to large organizations.
Scientists have observed the first real-time measurements of a rare gas atom and halogen molecule dissociation. The study found that adding vibrational energy to the bromine-stretching vibration led to rapid direct dissociation, while higher excitation resulted in a more complex mechanism.
Researchers bridge the gap between classical and quantum physics by exploring how the rules of quantum mechanics apply to macroscopic objects. They discovered that vibrations in a crystal can cause electrons to tunnel through barriers, leading to random quantum fluctuations.
Researchers have created a low-cost, human-focused land mine detection system using microwave-based sensors to detect vibrations remotely. The system costs around $10,000, compared to $1 million for laser-based Doppler remote detection systems.
A team of scientists at TUM developed an artificial sensory organ inspired by the lateral-line system found in fish and amphibians, enabling the underwater robot Snookie to orient itself in murky waters. This technology aims to enable AUVs to work autonomously in operations ranging from deep sea exploration to inspection of sewer pipes.
Researchers at the University of Michigan have developed mini generators that can produce electricity from random, non-periodic vibrations. These devices have the potential to power a range of applications, including remote wireless sensors and surgically implanted medical devices.
Three NASA scientific instruments, MINI-ME, PISA, and TTI, have completed environmental testing and passed critical tests, paving the way for their launch on the FASTSAT-HSV01 satellite. The instruments will study Earth's atmosphere and space weather, improving global predictions.
Researchers at MIT have found that chemical energy from ATP controls the shape of red blood cell membranes and determines their membrane vibrations. The study, published in PNAS, provides conclusive evidence that these vibrations require ATP input to occur.
Researchers at Duke University created a non-linear device that can convert a range of vibrations into electricity, improving efficiency over traditional linear devices. This technology has the potential to power small electronic devices, such as pacemakers and cardiac defibrillators, and even sensors in ocean buoys and spacecraft.
Researchers found that elephants use two pathways to 'hear' ground-borne vocalizations: somatosensory pathway through feet and trunks, and bone conduction pathway through toenails. This allows them to understand seismic communication over long distances.
A study published in PLOS ONE found that sensations of touch can be felt and mislocalized towards where a virtual body is seen, altering the mapping of touch sensations in space. This research demonstrates the crucial role of brain mechanisms in multisensory processing for conscious experience.
Researchers have created a new class of ultra-sensitive nanoscale devices capable of detecting the vibrations of individual gold nanoparticles. By studying bipyramid-shaped nanoparticles with highly uniform sizes and shapes, scientists overcame previous limitations in understanding damping in these systems.
University of Oregon physicists have developed a technique to slow down mechanical fluctuations in optomechanical oscillators, reducing phonon excitations to near 40 quanta. The goal is to reach the quantum mechanical ground state with minimal excitation, enabling precise nanotechnology measurements.
Researchers at Cornell University have developed a computer algorithm that can simulate the sounds of water and other fluids, allowing for more realistic graphics simulations. The algorithm is based on physics-based simulations and uses computational models to generate sound waves in response to vibrations and movements.
Acoustics expert and Springer editor Thomas Rossing received the prestigious Gold Medal from the Acoustical Society of America. His research focuses on musical acoustics, psychoacoustics, and physics education, with over 350 publications in these fields.
A six-month study found that Power Plate exercise aided in significant weight loss (11% body weight) and reduced visceral fat compared to diet and conventional fitness alone. Regular Power Plate exercise also outperformed dieting with low-impact results.
A study found that vibration plate exercise, combined with a calorie-restricted diet, led to significant long-term weight loss and fat reduction. The intervention group lost an average of 10.5% body weight and 47.8 square centimeters of visceral fat, compared to the control group who gained weight.
Scientists found ion channels on middle and shortest rows of stereocilia, not as previously thought. The discovery could lead to new treatments for hearing loss and deafness by understanding the adaptation process.
Higher frequency vibrations cause immediate changes in peripheral vascular systems, while lower frequency vibrations can lead to long-term vascular problems. Researchers found increased oxidative stress and pro-inflammatory factors in rats exposed to higher frequencies.
MIT Sensory Communication Group researchers create tactile devices that translate sound waves into skin vibrations, improving communication for deaf people relying on lip reading. The devices could be integrated into smartphones, providing a cost-effective alternative to cochlear implants.
Research reveals that elephants rely on bone conduction to detect seismic signals in estrus calls, allowing them to triangulate the source with greater accuracy. This method is more effective than somatosensory reception, which involves vibration-sensitive cells in the foot.
The Virginia Tech-CIMSS-PAC team develops a suite of new technologies to monitor bridge structural integrity. The proposed 'Bridge Prognostic System' uses piezoelectric materials and acoustic emission sensing to detect cracks, providing real-time data for decision-making.
The Lunar Reconnaissance Orbiter has successfully completed thermal vacuum testing at NASA's Goddard Space Flight Center, simulating extreme hot and cold conditions of space. The orbiter will carry seven instruments to provide detailed maps of the lunar surface and increase understanding of its topography and natural resources.
A University of Michigan engineer has created a machine called VIVACE that converts slow-moving ocean and river currents into clean, renewable power. The device works by creating vortex-induced vibrations in the water, which are then converted into mechanical energy and electricity.
Rice University scientists develop technique to view step-by-step breakdown of TCE, a common groundwater pollutant, using nanoparticles and surface-enhanced Raman spectroscopy. The method provides new level of detail for understanding catalyzed reactions in water, with potential applications in biofuels processing.
The project uses laptops with built-in accelerometer chips to detect tremors, allowing for faster earthquake detection and more accurate location of strong motions. With many sensors, it's possible to provide several seconds of warning before an earthquake hits neighboring regions.
Research shows that female fallow deer are attracted to deep calls from dominant males, who also have higher mating success. The study found a link between the depth of the call and body size, suggesting size exaggeration may be an evolutionary trait.
Scientists have found that certain nanostructures are more susceptible to failure by fracture at specific sizes. This is due to phonon confinement, which affects thermal transport and electronic processes. The study provides valuable information for designing stable nanostructures with reduced fracture energy.
A team of scientists found that intrinsic disorder in relaxor crystals leads to their extreme sensitivity to mechanical pressure or voltage. This property makes them useful for applications such as medical ultrasound imaging, loudspeakers, sonar, and computer hard drives. The research was published in Nature Materials.
A study published by the American Academy of Neurology found that stimulating hand muscles using low-amplitude vibration can help treat musician's dystonia. The therapy, which lasts just 15 minutes, has been shown to restore a more normal brain response in people with the condition.
Researchers at Penn University discovered that changing atomic mass reduces friction between sliding bodies, reducing energy loss and wear. This study provides a fundamental understanding of atomic-scale phenomena contributing to friction.
A team of researchers created the first fully functional radio from a single carbon nanotube, enabling tiny wireless communication devices. The nanotube radio works by detecting incoming radio waves and vibrating at its flexural resonance frequency to receive signals, offering a new approach to making radios.
The RT3 accelerometer measures walking intensity, providing an accurate alternative to traditional questionnaires. Researchers found that only 15% of Americans meet the recommended physical activity level, with people with disabilities getting even less.
Cornell researchers demonstrate a new way to make nanoresonators vibrate 'in the plane' – side to side. This technique shakes off extraneous materials, allowing only tightly bound pathogens to be detected. The ability to excite in-plane motion also has applications in making nanoscale gyroscopes and nano optics.
A £9.5 million European Union-funded project will build a self-healing house in Greece with unique walls that contain wireless sensors and can repair cracks using nano polymer particles. The system aims to alert residents straight away if there are any problems, potentially saving lives.
Cornell researchers have found a simple solution to measuring nanoscale vibrations by tapping with an atomic force microscope (AFM), allowing for the detection and identification of bacteria, viruses, and other organic molecules. The new method uses probes similar to those in AFMs to measure vibrations in nanomechanical oscillators.
Researchers found termites prefer blocks with more wood content, even without touching them. The study suggests termites use vibrations to assess food quality, which could lead to new methods for controlling feeding termites and mitigating termite damage in buildings.
Researchers at Purdue University have developed mathematical models to simulate and analyze the rattling of car headrests, a major source of consumer dissatisfaction. The models can predict which vibration frequencies cause the rattling and enable automakers to tune their suspension systems more effectively.
Researchers at Brown University and Columbia's Earth Institute recovered two lost ocean-bottom seismometers, providing unprecedented insights into the process of seafloor spreading. The data from the instruments reveals increasing seismic activity before a major episode of seafloor creation, offering a unique 'ear to earth's belly'.
Researchers at Ford Motor Company tested four driver warning systems to help combat drowsy driving. The study found that these systems cut drivers' reaction time in half, with the steering wheel vibration warning being the most effective.
Researchers at Cornell University found that the distribution of paired electrons in a common high-temperature superconductor was disorderly, but the distribution of phonons was also disorderly. This suggests that a similar mechanism may be responsible for high-temperature superconductivity.
Researchers identify lattice solitons, localized energy waves, in uranium crystals using x-ray and neutron scattering experiments. The discovery has immediate implications for uranium science and solid-state physics.
A team of scientists has successfully created a new material that induces magnetic vibrations at visible light frequencies, allowing for the creation of ultra-small optical lenses and miniature lasers. This breakthrough could lead to significant advancements in optics, optoelectronics, and biosensing.
A study by Romo and de Lafuente found that the medial premotor cortex plays a crucial role in sensory perception, particularly in touch. The researchers used macaque monkeys as subjects and found that activity in this region correlated with the intensity of the stimulus, regardless of whether the monkey consciously felt it or not.
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 developed special vibration-isolating seats to manage increased vibration risks, while monitoring potential damage to the aircraft. The findings support the installation of larger observation windows despite increased vibration concerns.
Researchers discovered that monkeys perceive vibration frequency by analyzing neuronal firing patterns, particularly in the first 250 milliseconds. The findings suggest a complex process where attention to the initial response dominates perception, with subsequent firings becoming less significant.
Researchers at NIST developed a compact, vertically mounted cavity that eliminates vibrations, allowing for stable laser light with minimal environmental disturbances. The new design outperforms previous systems in size and cost, enabling widespread adoption of precise optical technologies.
Physicists propose new class of time machines that avoid difficulties inherent in other models. Researchers also analyze lateral vibrations to control friction and crack propagation in thin films. The horizontal Brazil nut effect is studied, showing grain migration to center or edge based on size and density.
Researchers found that adding noise to weak vibrations increased the ability of participants to detect the frequency of the original signal. This effect could be useful in designing prosthetics for the elderly to prevent painful falls and improve balance control.
Researchers from Stanford University explore the secret world of elephant communication, discovering that elephants can sense underground vibrations generated by low-pitched sounds. The team uses seismic signals to communicate with elephants, finding that they can feel and interpret these vibrations through their trunks and feet.