Blow-up and global solutions for a class of nonlinear parabolic equations with different kinds of boundary conditions

摘要

By constructing different auxiliary functions and using Hopf's maximum principle, the sufficient conditions for the blow-up and global solutions are presented for nonlinear parabolic equation u_t = ?(a(u)b(x)c(t) ?u) + f(x, u, q, t) with different kinds of boundary conditions. The upper bounds of the "blow-up time" and the "upper estimates" of global solutions are provided. Finally, some examples are presented as the application of the obtained results.