<正> By considering the fluctuation of grand potential Ω around equilibrium with respect to small one-particledensity fluctuations δρα ((?)),the phase insta
<正> Models for diseases spreading are not just limited to SIS or SIR.For instance,for the spreading ofAIDS/HIV,the susceptible individuals can be classified in
<正> By applying the standard analytical techniques of solving partial differential equations,we have obtainedthe exact solution in terms of the Fourier sine se