“…If the output of the object can be considered small deviations of ∆Θ(t, z) from some temperature Θ * (t, z) = Θ * , while assuming that Θ(t, z) = Θ * + ∆Θ(t, z), then with fairly smooth dependencies ρ(Θ), C p (Θ), λ(Θ), Equation ( 8) can be linearized in the vicinity of temperature Θ(t, z)| z=0 = Θ 1 (t), ∂Θ(t,z) ∂z z=L = Θ 2 (t) by expanding nonlinear dependencies into a Taylor series. We use this technique in Equation (8), which is a one-dimensional second-order differential equation with a nonlinear operator calculated as follows:…”