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APPML
2005
13 years 5 months ago
2005
In this paper, we discuss the existence of positive periodic solutions to the nonlinear differential equation u (t) + a(t)u(t) = f (t, u(t)), t R, where a : R [0, +) is an -peri...
APPML
2005
13 years 5 months ago
2005
Using two classes of test functions introduced recently by the authors, a criterion for conditional stability of the trivial solution of a second-order semi-linear differential eq...
APPML
2005
13 years 5 months ago
2005
We present a convection model which can be coupled with fire propagation models in order to take into account the wind and the slope which are two of the most relevant factors aff...
APPML
2006
13 years 5 months ago
2006
The stability of the hydromagnetic Couette flow is investigated when a constant current is applied along the axis of the cylinders. It is shown that if the resulting toroidal magn...
APPML
2006
13 years 5 months ago
2006
This work deals with the qualitative analysis of a nonlinear integro-differential model of immune competition with special attention to the dynamics of tumor cells contrasted by t...