The permutation entropy concept of Bandt and Pompe (2002 Phys. Rev. Lett. 88 174102) is used to analyze the fluctuations in ion saturation current that spontaneously arise in a basic experimental study (Pace et al 2008 Phys. Plasmas 15 122304) of electron heat transport in a magnetized plasma. From the behavior of the Shannon entropy and the Jensen–Shannon complexity it is found that the underl...

We review some properties of the convex roof extension, a construction used, e.g., in the definition of the entanglement of formation. Especially we consider the use of symmetries of channels and states for the construction of the convex roof. As an application we study the entanglement entropy of the diagonal map for permutation symmetric real N = 3 states ω(z) and solve the case z < 0 where z...

Abstract Due to the significant intermittent, stochastic and non-stationary nature of wind power generation, it is difficult achieve desired prediction accuracy. Therefore, a method based on improved variational modal decomposition with permutation entropy proposed. First, meteorological data farms, Spearman correlation coefficient used filter that are strongly correlated establish model set; t...