Articles tagged with Velocimetry
A team of researchers describes a novel flight style in the smallest free-living insects, beetles of the featherwing family. They found that these insects use a bristled wing style and rowing movements to excel at flight, defying conventional wisdom about insect aerodynamics.
Researchers from NTU Singapore found significant increases in pollutant emissions at major international seaports during the COVID-19 pandemic. Emissions rose by over 100% in some ports, with container ships and dry bulk carriers experiencing the largest spikes.
A team of UBCO researchers developed a recipe for a clean-burning, power-boosting aircraft fuel by adding graphene oxide nanomaterials to ethanol. This mixture improves the burn rate by about eight per cent, reducing carbon footprint and increasing engine power.
A new experimental method tracks the motion of fibers instead of particles to reveal previously hidden information about turbulent flows. The researchers developed an innovative solution using rigid fibers, which allowed them to measure the speed and direction of flow at two points a fixed distance apart.
The NIST-developed emberometer uses digital cameras to track embers in mid-air and reconstruct their 3D shapes. This tool helps researchers understand the behavior of embers, which can aid in developing better protection for structures during wildfires.
University of Virginia researchers design a simple way to implement a tunable stiffness strategy in robots, enabling efficient swimming at varying speeds. The approach, inspired by the natural adaptability of fish, uses a programmable artificial tendon to adjust tail stiffness in real-time.
Researchers created a system of small autonomous robots that teach themselves to move forward as quickly as possible by continuously conducting small experiments. The results showed that this simple self-learning robot can tackle new situations and recover from damage, making it robust and scalable for applications in soft robotics.
A Tsukuba University study shows that comprehensive implementation of COVID-19 infection prevention measures boosts effectiveness, while partial implementation compromises it. The study found that implementing measures either individually or in partial combinations yields limited results.
Stevens Institute of Technology researchers are using a wind tunnel to measure the flow of air at previously inaccessible hypersonic speeds. By tagging and illuminating gas with laser beams, they aim to understand how boundary layers transition from order to chaos, affecting drag and heat transfer.
Researchers developed a statistical model to represent driving behaviors and their changes among drivers, accounting for external factors like road structure. The method was applied to Intelligent Speed Adaptation (ISA) technology, showing it can be effective in certain cases but not others.
Researchers investigate coronary microvascular spasm using real-time blood flow velocity measurement during acetylcholine testing. The study aims to provide objective evidence on the existence of coronary microvascular spasm, a condition affecting chronic coronary syndromes.
Researchers found that athletes who used a load velocity profile lifted less overall but gained strength and power, improving muscular performance. The study suggests that traditional training methods may not be the most effective, as athletes may lift too much or too little, leading to fatigue and injury.
Peregrine falcons have the fastest vision among birds of prey, registering up to 129 Hz blinks per second for high-light conditions. This exceptional visual acuity allows them to track fast-moving prey like flying birds and small mammals.
A team from North Carolina State University created a technique called Wi-Fi-Assisted Inertial Odometry (WIO) to track devices in near-real time. WIO uses Wi-Fi signals and accelerometer technology to accurately measure speed and distance, correcting errors made by inertial measurement units.
A new study found that slower walking speeds are associated with a higher risk of developing mobility disabilities. Researchers measured participants' walking abilities and followed up with them over eight years to track the development of mobility issues. The findings suggest that simple walking speed assessments in healthcare provide...
A study found that slower walking speeds are linked to lower survival rates and increased likelihood of hospitalization in older patients with blood cancers. Measuring gait speed offers a useful tool for tailoring care to individual patients.
A study by La Trobe University found that Fitbits have good-to-excellent reliability for measuring running speeds between 8-14kms/h. The accuracy of the device was also confirmed in a slow motion visual count, with a difference of less than one per cent.
Researchers at Griffith University have developed a procedure for making precise measurements of speed, acceleration and material properties possible. Using photons and entanglement, they achieved sensitivity approaching the Heisenberg limit, outperforming previous experiments.
A team of astronomers using Gaia data found twenty high-velocity stars racing towards the Galactic centre, raising questions about their origin. The stars' velocities could be a sign of supermassive black holes or binary systems in nearby galaxies.
A new study reveals that basking sharks can accelerate to over 90 degrees in just nine seconds, clearing the water at nearly 5.1m/s and reaching a height of 1.2m above the surface. The finding showcases the surprising speed of these gentle giants, dispelling their reputation as slow swimmers.
Tropical Depression Joyce's cloud top temperatures are as cold as minus 70 degrees Fahrenheit, generating heavy rainfall. The depression is forecast to weaken and become a remnant low over the next couple of days.
A recent study published in The Journals of Gerontology: Series A found that individuals who consumed more fruit, vegetables, and wholegrain cereals across their adult lives performed better in physical function tests at age 60-64. Improving diet quality throughout adulthood can have a significant beneficial effect on strength and phys...
A team of researchers in Australia developed an automatic system to diagnose Parkinson's disease severity from drawing speed and pen pressure measurements. The system combines these metrics into a single measurement, the Composite Index of Speed and Pen-pressure score, allowing for accurate diagnosis and monitoring of treatment effects.
A new MIT-developed device can accurately measure walking speed using wireless signals, providing insights into cognitive decline, cardiac disease, and other health issues. The system has 95-99% accuracy and can be placed on a person's home wall without intruding on daily life.
Researchers developed a non-wearable sensor system to measure walking patterns and predict falls in seniors. A gait speed decline of 5 cm/s was associated with an 86.3% probability of falling within three weeks.
Researchers studied the effects of different spin types on cricket ball trajectory. They found that adding top-spin to a delivery can reduce pitch length by up to 25cm, while introducing side-spin can produce significant drift. The study aims to help newcomers master spin-bowling and potentially benefit tennis players.
Researchers developed a new technique for fast photonic sensing of freely flowing particles using an opto-mechano-fluidic resonator. The sensor measures compressibility and viscoelasticity of cells and bioparticles, which correlates with diseases like cancers and anemia.
Scientists have developed a method to detect the shape of light waves with unprecedented precision by studying the behavior of 'quasiparticles' - ripples in the electric field that emerge when light meets solid surfaces. This breakthrough has significant implications for applications in metrology, chemical sensing, and adaptive optics.
Researchers at the University of Georgia have developed a technique to measure an individual's visual processing speed, which can predict executive cognitive functioning. The study used a simple test of visual flicker to evaluate brain function quality, and found that older adults had slower visual processing speeds.
A NASA-developed laser communication system has demonstrated record-breaking data download and upload speeds to the moon, as well as highly precise distance and speed measurements. The Space Optical Communication and Navigation System can provide micrometer-level accuracy over a 622 megabits-per-second laser communication link.
A new study published in Biology Letters found that changing walking speeds can burn up to 20% more calories than maintaining a steady pace. The research measured the metabolic cost of varying speeds and found that even small changes in speed can significantly impact calorie burn.
Scientists at Niels Bohr Institute create novel sensor using entangled atoms to precisely measure tiny magnetic fields, enabling new insights into biology and medicine. The researchers employ a unique technique involving laser light and quantum uncertainty relations to overcome classical physics limitations.
A new measuring system has been developed to objectively assess the fatigue level of physicians through their eye movement, specifically the speed of saccadic movements. This study found that the speed of saccadic movements effectively diminished after long hours, while subjective fatigue perception increased.
A new study reveals that individual cells' migration speed changes randomly through successive generations, despite the population's average speed remaining constant. This finding has significant implications for cancer treatment and tissue repair, suggesting a target for drugs to modulate cell migration speed.
A QUT study found that drivers underestimate speed limits at inactive roadwork sites, leading to high crash rates. The researchers suggest combining measures such as variable speed limit signs and police enforcement to improve safety.
A study by Oklahoma State University found that college football players experience significant increases in strength and size over four years of training. However, speed and power show little to no change despite sophisticated training regimens.
Researchers at Griffith University have demonstrated that particle properties can be measured simultaneously with high precision, challenging the long-held idea that this is impossible. The findings provide an important advance in the quantitative understanding and experimental verification of complementarity.
Researchers found that the increase in intelligence during adolescence can be largely attributed to improvements in mental speed. The study analyzed data from over 6,900 teenagers and discovered that older teens performed better and worked faster on cognitive tests.
Researchers from Washington State University tested common cheating methods in baseball, finding that corked bats result in slower bounces, while juiced balls have nearly identical coefficients of restitution as contemporary ones. Humidors also curb home run production by reducing ball bounce.
Research found that simple tests, such as Road Sign Recognition and Compass tasks, can identify those at risk of failing the on-road driving test. The tests correctly classified 80-85% of unsafe drivers.
A new method has been developed to estimate uncertainty in particle image velocimetry, a widely used technique in fluid mechanics. The approach allows for more accurate results and increased reliability in flow measurements, with potential applications in fields such as aerodynamics, hydrodynamics, and biomedical research.
A joint project between Iowa State University and Goodrich Corp. aims to develop advanced flow diagnostic tools for fuel nozzles in jet engines. The research uses techniques such as particle image velocimetry and molecular tagging velocimetry to analyze the uniformity, direction, temperature, and density of fuel droplets.
Researchers measured the motion of stars in a distant galaxy and found they are moving at incredible speeds, contradicting expectations of small galaxy size.
Researchers at NIST developed formulas to help law enforcement officers accurately calibrate down-the-road radar devices and ballistic chronographs. The new tools provide more precise speed measurements, improving the effectiveness of crime-fighting technologies.
Researchers developed a method using laser beams and fluorescence to measure airflow rates in wind tunnels, satellite engines, and object wakes. This technique surpasses traditional particle methods in accuracy.
Researchers found that safety measures introduced over the past decade have failed to reduce death rates and speed in Grand Prix motor racing. Experts recommend strengthening barriers, protective clothing for drivers, and improving cornering speeds to prioritize driver safety.
A study analyzing 138 bird species reveals that maximum flight speed is not solely determined by aerodynamic scaling rules. The authors found that flight speed also reflects the evolutionary history of the species, with species from the same group tending to fly at similar speeds.
A new nanoscale apparatus developed at JILA measures the wiggling of a tiny gold beam using electrons, enabling faster scanning tunneling microscopes. The device offers a potential 500-fold increase in speed and can measure atomic vibrations in high definition.
A study by Penn State researchers found that slow download speeds increase arousal in some individuals, leading to greater physiological excitement and improved memory. Slower speeds also encourage more active browsing behaviors.
A meta-analysis of studies on risk factors for unsafe driving found that cognitive processing speed is the most accurate measure of older drivers' abilities. This metric can be improved through speed of processing training, enhancing driving skills and safety.
The NEAR mission has provided definitive mass and density measurements of asteroid 433 Eros, confirming it is an undifferentiated, homogeneous structure. The asteroid's surface features spectacular images and movies showing ridges, pits, troughs, and grooves that provide fascinating clues about its history.
Researchers using the VLA radio telescope found a pulsar that is at least 40,000 years old and may be as old as 170,000 years. This discovery challenges current understanding of neutron stars and their ages.
A team of scientists from NASA and Max Planck Institute observed the deflection of galactic dust grains by solar radiation, finding that radiation pressure is stronger than solar gravity for certain mass ranges. This phenomenon affects the trajectory of dust particles near the Sun, causing them to move slower and be deflected.
Stanford researchers used atom interferometry to measure the force of gravity on individual atoms with unprecedented accuracy. Their findings strengthen the likelihood that previous neutron interferometry experiments were incorrect, validating the power of atom interferometry as a precise measurement tool.
A new superconducting device detects single light quanta at wavelengths longer than previously possible, detecting 25 billion photons per second. The device is capable of detecting changes in light level and has small size, making it a candidate for a superconducting computer input component.
An international team of scientists identified regions on the Sun where the high speed solar wind originates using the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on SOHO. The research will lead to a better understanding of the solar wind's effect on Earth's space environment.
The study found that elderly pedestrians often encounter insufficient crossing time at intersections, with many experiencing physical difficulties. The researchers emphasize the need for countermeasures such as engineering design considerations and educational campaigns to enhance safety.
Researchers have developed a micron-resolution particle image velocimetry system to measure velocity fields in bioanalysis systems where low-light level imaging is critical. The technique has been refined to provide velocity-field measurements with spatial resolutions approaching 1 micron.
Cornell University astronomers James Cordes and Barney Rickett have developed a method to calculate the speed and distance of extremely fast-moving neutron stars, called pulsars, by analyzing their twinkling rate. By combining data from two large radio telescopes, they can identify new pulsars and better understand their physics.
Researchers measured the velocity of gases ejected during an early phase of supernova formation, allowing them to tie its formation to the star's evolutionary phases. The study found that the entire nebula is at least 200,000 years old and probably several times older.