The dynamical properties of fractional-order Duffing–van der Pol oscillator are studied, and the amplitude–frequency response equation of primary resonance is
Conservation laws for the Birkhoffian system and the constrained Birkhoffian system of Herglotz type are studied.We propose a new differential variational princ
Lithium-sulfur (Li-S) batteries have received more and more attention because of higher specific capacity and energy density of sulfur than current lithium-ion