“…For the following values of the parameter σ � 0.1, 1, 5, we simulate six tests of the decay of the energy (19) (for similar constructions, we refer to [41,42]). Test 1: in the first three tests, we present the decay case using the exponential function g 1 (t) = e − 2t , the vector field (103), and the parameters σ = 0.1, 1, 5 (Test 1.1, 1.2, and 1.3).…”