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Thermal siphon phenomenon. (a) A typical thermal Siphon phenomenon wherein heat flows seemly from low temperature node ( j ) to high temperature node ( k ). (b) A pattern of normal heat conduction. (c) and (d) represent the corresponding power spectra of the time series from the nodes i, j, k and i', j', k' in (a) and (b), respectively, where the blue solid, red dash and yellow dot lines represent the cases of the nodes i and i' , j and j' , k and k' , respectively. (e) Dependence of the thermal siphon percentage on network assortativity, which is the number of links with abnormal heat conduction divided by the total number of links in a network.
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