Sentences with word «helicity»

Modeling studies have projected that CAPE will increase in a warmer climate leading to more frequent environments favorable to severe thunderstorms in the U.S.. However, they found that the meteorological trends were not due to increasing CAPE but instead due to trends in storm relative helicity, which has not been projected to increase under climate change.

The high electrical conductivities of ∼ 1500 to 1800 siemens per centimeter after iodine doping and the chiral helicity of these films may be exploited in electromagnetic and optical applications.

As a workaround, Ebrahimi is investigating coaxial helicity injection (CHI), a method of starting fusion reactions that doesn't involve solenoids, thereby simplifying the design of conventional tokamaks and making them both more compact and less costly.

The proxy is associated with magnetic helicity, which reflects the extent of twist and entanglement of the magnetic field.

Their initial calculations confirmed that neither magnetic energies nor the total helicity of the magnetic field fulfilled the criteria for a predictive factor.

The proxy (which compares two helicities in the potentially eruptive region) remains low in non-eruptive scenarios; whereas in every other case it increases significantly before the eruption.

In real viscous liquids, vortices dissipate eventually, but Irvine and his team found that because helicity is conserved, they can last much longer than expected.

They looked at two factors: convective available potential energy (CAPE) and a measure of vertical wind shear, storm relative helicity.

The researchers tested various parametric simulations and analyzed changes in magnetic energy and magnetic helicity, a quantity that measures the extent of entanglement and twist of the magnetic field.

The simulations show that the technique, known as coaxial helicity injection (CHI), could also benefit tokamaks that use superconducting magnets.

«Our novelty was to realise that by twisting the helicity of these beams in a non-linear fashion, the result would be a propagation dependent angular velocity,» he explains.

The link between the changes in severe tornado outbreaks and an increase in storm relative helicity is unsurprising but difficult to explain, Brooks says.

But the team did find a substantial increase in another known risk factor for tornado formation: a parameter called storm relative helicity (SRH), which is related to the differences in wind speed and direction at various altitudes between ground level and 3 kilometers.

For example, every time a writhe increases, a twist decreases, so helicity is conserved.

But Cohen and his colleagues found the increases in outbreaks were driven instead by storm relative helicity, which has not been projected to increase under a warming climate.

To understand the increased frequency in tornado outbreaks, the researchers looked at two factors: convective available potential energy, or CAPE, and storm relative helicity, which is a measure of vertical wind shear.

Dlugach, J.M., and M.I. Mishchenko, 2006: Enhanced backscattering of polarized light: Effect of particle nonsphericity on the helicity - preserving enhancement factor.