Recent content by shyboy

The term HTS may also refer to a particular class of superconductors, which demonstrates high critical temperature (actually, there is only one) But this particular materials may be called HTS even if they have rather low critical temperature. They are called so to emphasize that they have a...

well, the shock wave hits only once so yes, the frequency is infinitely small. On the other hand, the detected frequency from the source is finite, but Doppler shifted to a lower value. For example, if source is just "beeping", you will still hear the beeps after it will pass you, but the...

Another crude explanation is the following: When you inverse the field, the spin system is immediately in the nonequilibrium postion. You may describe this position as a state with negative temperature. Indeed, at negative temperature the number of spins at higher energy should be bigger then...

The mechanism, which you have proposed, can indeed exist in the absense of gravity, or in horizontal direction. In a real life the convection mechanism will always overtake it, because it will provide much stronger heat transfer. For example, if you put a pot near the open fire it will be more...

MRI has little to do with EM radiation. It works with and detects magnetic fields. Alternative magnetic field is used to exicite the internal spin transition, and a big coil is used to detect them as a change of the magnetic field in a body. So MRI does not rely on EM waves to probe the body...

a linear differential equation with non zero additional term has a soulution which is a sum of a general solution of this equation with zero additional term and a particular solution of this equation. To be more clear (I assume that theta is independent variable) the equation u^{''}+u=0...

yes, but without echo

Check this: In their write-up of the experiment, Houpt and Smith noted something peculiar. When the rats that got the real magnetic bath were returned to their cages, they immediately began a rapid, nose-to-tail circling—and all in a counterclockwise direction. Some of the animals rotated 30 or...

You are not the first, neither you will be the last. The problem is that magnetization and magnetic field may be measured in different units. The relation between magnetization, magnetic field strength, and magnetic field is also different in SI and Gauss system. Moreover, there are two...

well, the speed of a sound wave depends not only on a density, but on the interaction between particles as well. I herad that theoreticians belived that at the BigBang the "sound" waves had the same speed as light. But, actually, that may be different physics altogether. As to Chernkov...

It looks like you are trying to address the question how reversible mechanical laws produce irreversible thermodynamics...

i think so, because there is a lot of work done on layered absorbers. cannot give you any specifics, but you may look on RF, radars, and absorbers.

yes, they both will be equal to the speed of light.

if you fix the waveguide length, then you have a resonator and boundary conditions for x, too. The boundary conditions for an open end is that there is no pressure change at it.

in first approximation the field well outside the magnet is a usual dipole field. The next step is quite troubling, because you need to take into the account the effect of one part magnet on the magnetization of another part of the magnet. The problem is that you may have hysteresis und...