We proposed a thermoacoustic cooling system as a technique using solar heat energy. My previous study confirmed that this system can drive and cool materials using solar heat energy. The amount of solar heat energy depends on the season because solar heat energy is natural energy. Therefore, examination of whether a long-term drive of this system is possible irrespective of the season is necessary for practical use of thermoacoustic cooling systems using solar heat energy. This report descries a driving experiment of the system operating between April and December. Results demonstrate the possibility of long-term driving of the thermoacoustic cooling system using solar heat energy by shortening the time until reaching this system's oscillation temperature.
We investigate the photoresistance of a magnetically confined quantum wire in which microwave-coupled edge channels interfere at two pinning sites in the fashion of a Mach-Zehnder interferometer. The conductance is strongly enhanced by microwave power at B = 0 and develops a complex series of oscillations when the magnetic confinement increases. Both results are quantitatively explained by the activation of forward scattering in a multimode magnetically confined quantum wire. By varying the strength of the magnetic confinement we are able to tune the phase of electrons in the arms of the interferometer. Quantum interferences which develop between pinning sites explain the oscillations of the conductance as a function of the magnetic field. A fit of the data gives the distance between pinning sites as 11 μm. This result suggests that quantum coherence is conserved over a distance three times longer than the electron mean free path.
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