Sentences with phrase «of wave velocity»

That assertion is consistent with the analysis of wave velocity which shows there must be light elements in the liquid core (roughly 5 %, the liquid is roughly the size of the moon) and theoretical analysis for the liquid core that shows CH4 can «dissolve» in the liquid core and would be extruded when a portion of liquid core solidifies.

Not exact matches

I run some calculations to measure the wave length and velocity of that sound.

Inspired by a 2012 paper that proposed a correlation between such hotspots and the velocity of seismic waves moving through Earth's interior, UC Santa Barbara geochemist Matthew Jackson teamed with the authors of the original paper — Thorsten Becker of the University of Texas at Austin and Jasper Konter of the University of Hawaii — to show that only the hottest hotspots with the slowest wave velocity draw from the primitive reservoir formed early in the planet's history.

When they compared oceanic hotspots with high levels of He - 3 / 4 to seismic wave velocities, they found that these represent the hottest hotspots, with seismic waves that move more slowly than they do in cooler areas.

By measuring the velocity of those waves, scientists can gather data about the characteristics of the rocks through which they traveled.

«We can therefore determine the velocities of the waves and so tell the difference between one rock and another and whether or not the rock is molten,» says Ebinger.

Horizons are formed where the local speed of the medium exceeds the wave velocity.

The researchers then measured the effect of flavanols on hallmarks of cardiovascular aging, such as arterial stiffness (as measured by pulse wave velocity), blood pressure and flow - mediated vasodilation (the extent to which blood vessels dilate in response to nitric oxide).

This separation is essential for the study of gravity because the effect of gravitational radiation — the steady conversion of orbital velocity to gravitational waves as predicted by Einstein — is incredibly small and would have negligible impact on the orbit of the pulsar.

The distinctive waves with capped tops and cloudless troughs are created by what's known as velocity shear, which occurs when a fluid or two different fluids — wind and water, for example — interact at different speeds to create differing pressures at the back and front ends of the wave.

Researchers calculated temperatures at the bottom of the crust, which varies in thickness, by measuring the velocity of seismic waves that travel near the interface between the lower crust and uppermost mantle.

«When your arteries are more stiff, you have higher pulse wave velocity, which increases your risk of cardiometabolic disease in the future,» says Raed.

But by measuring rotation as well as translation, seismologists can get not only the displacement of earthquake waves but also their velocities, which are a powerful probe of subsurface structure.

There are four types of blast trauma injury: 1) primary injury caused directly by the pressure wave, which can travel through tissue at velocities close to that of sound in water, 2) secondary injury caused by objects put in motion by the blast, 3) tertiary injury caused by an individual thrown into motion by the blast and hitting surrounding objects, and 4) quaternary injury caused by burns, explosion - related injuries, illnesses and diseases not attributed to the other three blast trauma types.

Thus astronomers can interrogate the photons to reveal the basic physical properties, like velocity and density, of gas passing through shock waves in the jets.

The new system, described in the March 5 edition of the journal Nature Communications, combines photons and phonons — electromagnetic energy and sound energy — to conduct sophisticated signal processing tasks by harnessing the properties of lower - velocity acoustic waves.

Nearly a decade ago, Steve Elgar of the Woods Hole Oceanographic Institution (WHOI) set up a series of floating pressure gauges, sonar devices and water velocity meters on a beach in Duck, N.C., in an attempt to determine what changes in wave action bring sand back onshore.

These two figures show the internal waves at Dongsha Island on April 23, 2010, as seen by the radar on TerraSAR - X in its conventional mode of operation (left) and in the experimental new mode that permits direct velocity measurements (right), with the measured surface velocities shown in color.

«This is a significant breakthrough using a single image to determine the velocity of a wave below the surface,» said Hans Graber, UM Rosenstiel School professor of ocean sciences and director of CSTARS.

«This is the first time internal wave velocities could be calculated from data acquired during a single overpass of a satellite,» said Roland Romeiser, associate professor of ocean sciences at the UM Rosenstiel School.

Prior to the development of this new technology, researchers would have to compare several images taken during multiple satellite overpasses to estimate internal wave velocities.

The mineral has a unique layered structure that causes seismic waves to change velocity depending on their direction of travel — just as in the D» layer.

Observations from NASA's Chandra X-ray Observatory show that both of these nuclei — and the region of hot gas between them — have been heated by shock waves created as gas clouds collide at high velocities.

When reflected back by rain, hail, airborne debris, or even insects, the waves create an image of storm activity and indicate wind velocity.

Wind velocities of three to 15 kilometers per hour will produce water waves having periods up to three seconds.

And some shoots like a jet from the disk's center at velocities up to 30 times the speed of sound, triggering supersonic shock waves.

The equipment was used to measure the velocity and direction of different sound waves generated by earthquakes as they traveled under Sierra Negra.

The researchers then visualized the velocity of the two liquids using a technique called Laser Doppler Velocimetry, which detects changes in the frequency of light waves when a laser beam hits them.

Using high - speed photography data on the apokamp dynamics, the authors elucidated its nature as consisting of ionisation waves — so - called plasma bullets — that move with a velocity of 100 - 220 km / s.

Because we can not sample the deep Earth, we must deduce its composition either by looking at the clues hidden in igneous and metamorphic rocks, or by examining proxies for composition and structure such as the three - dimensional variation of the velocity of seismic waves produced by earthquakes and sampled by networks of seismometers on the surface.

Led by Carnegie's Ho - kwang «Dave» Mao, the research team believes that as much as 300 million tons of water could be carried down into Earth's interior every year and generate deep, massive reservoirs of iron dioxide, which could be the source of the ultralow velocity zones that slow down seismic waves at the core - mantle boundary.

As the speed of the object increases to the sonic velocity (the local velocity of sound waves), these sound waves begin to pile up in front of the object.

During a four - year period, the researchers used sensors to measure relative changes in the velocity of seismic waves moving through the volcano over time.

These seismic measurements enabled scientists to visualize these ultralow velocity zones in some regions along the core - mantle boundary, by observing the slowing down of seismic waves passing through them.

«Where these two crustal blocks came into contact, there would have been tremendous deformation that aligned the mineral grains in the rocks and changed the propagation velocities of the seismic waves,» Fischer said.

«Pulse wave velocity from the aortic arch provides functional information about vessel compliance that may help determine a patient's risk for cerebrovascular disease down the road,» said Kevin S. King, M.D., assistant professor of radiology at UT Southwestern Medical Center in Dallas.

«Our results demonstrate that aortic arch pulse wave velocity is a highly significant independent predictor of subsequent white matter hyperintensity volume and provides a distinct contribution — along with systolic blood pressure, hypertension treatment, congestive heart failure and age — in predicting risk for cerebrovascular disease,» Dr. King said.

The results showed that aortic arch pulse wave velocity helped predict white matter hyperintensity volume, independent of the other demographic and cardiovascular risk factors.

Dr. King and colleagues set out to evaluate the relationship between aortic arch pulse wave velocity and subsequent cerebral microvascular disease, independent of other cardiovascular risk factors, among 1,270 participants in the multiethnic Dallas Heart Study.

Led by Geophysical Laboratory's Ho - kwang «Dave» Mao, the research team believes that as much as 300 million tons of water could be carried down into Earth's interior every year and generate deep, massive reservoirs of iron dioxide, which could be the source of the ultralow velocity zones that slow down seismic waves at the core - mantle boundary.

The scans create images of seismic - wave velocity, which is largely controlled by temperature.

Doppler Effect stated that the frequency a wave as perceived by an observer changes depending on the relative velocity of the object producing that wave.

A recent observational study investigating sex differences in target organ damage, in insulin - resistant patients, demonstrated increased vascular and renal damage in women, who had increased intima - media thickness progression, higher numbers of vascular plaques, and reduced pulse wave velocity compared with men (321).

Heezel, D., Wiens, D., Nyblade, A., Kanao, M., Aster, R., Huerta, A., Wilson, T., Anandakrishnan, S., An, M., Zhao, Y., Shear velocity structure of central Antarctica from teleseismic Rayleigh waves, National Institute of Polar Research Symposium, Tokyo, Japan, 14 - 18 November, 2011.

Lévêque, S - velocity model and inferred Moho topography beneath the Antarctic Plate from Rayleigh waves, Journal of Geophysical Research, 10.1002 / 2014JB011332, 2015

However, the football players displayed significantly higher pulse wave velocity, a measure of arterial stiffness (football: 6.5 vs control: 5.7).

Recently developed, in - situ techniques for direct volume determination, acoustic wave velocity measurements, and x-ray diffraction at HPCAT, along with molecular dynamics simulations, were employed to explore the nature of the unusual and pressure - tunable, compression and elastic properties.

â $ œIt is known that in other populations, increased pulse wave velocity precedes the development of hypertension, â $ Kim says.

Pulse wave velocity is measured by noninvasive devices that track the speed of blood flow by calculating differences between arteries in the neck and the leg.

N ~ 2 seen in the spiral arms in M81 and M101 supports the scenario of star formation triggered by cloud - cloud collisions enhanced by spiral density wave, while N ~ 1 derived in giant HII regions in M101 suggests the star formation induced by the Parker instability triggered by high velocity HI gas infall.