Los epew : Una forma de relatar la cosmovisión ranquel

El siguiente trabajo tiene por objeto indagar el grado de conservación de los relatos tradicionales orales, en particular de los ngïrï epew o cuentos del zorro, y analizar la importancia que éstos tienen al interior de la cultura ranquel. Al respecto, se prestará especial atención a los contextos en los que estas narraciones tienen lugar, quiénes son los narradores y en qué lengua se transmiten. En este sentido, se parte de la hipótesis de que estos relatos constituyen la identidad cultural del puebloranquel, por lo tanto, cada vez que se narran se ponen en juego dos operaciones: por un lado, los hablantes resignifican su cosmovisión y, por otro, se da a conocer a un tercero, que es elreceptor, parte de esa cosmovisión, resguardada en el epew. Dicho análisis se llevará a cabo a partir de una selección de relatos relevados por la Dra. Fernández Garay, en una población indígena ranquel entre 1983 y 1986 en la provincia de La Pampa. En relación a dicho relevamiento, cabe mencionar que como la lengua, al momento de realizarse la recolección, se encontraba en un avanzado proceso de pérdida, fue necesario que los discursos tuvieran lugar en contextos socioculturales inducidos por la propia investigadora, puesto que el ranquel ya no era empleado por los hablantes en sus comunicaciones diaria

A free boundary tumor model with time dependent nutritional supply

A non-autonomous free boundary model for tumor growth is studied. The model consists of a nonlinear reaction diffusion equation describing the distribution of vital nutrients in the tumor and a nonlinear integro-differential equation describing the evolution of the tumor size. First the global existence and uniqueness of a transient solution is established under some general conditions. Then with additional regularity assumptions on the consumption and proliferation rates, the existence and uniqueness of steady-state solutions is obtained. Furthermore the convergence of the transient solutions toward the steady-state solution is verified. Finally the long time behavior of the solutions is investigated by transforming the time-dependent domain to a fixed domain.Ministerio de Economía y Competitividad (MINECO). EspañaEuropean Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)Junta de AndalucíaNational Natural Science Foundation of ChinaSimons Foundatio

The persistence of synchronization under environmental noise

It is shown that the synchronization of dissipative systems persists when they are disturbed by additive noise no matter how large the intensity of the noise provided asymptotically stable stationary stochastic solutions are used instead of asymptotically stable equilibria

The pathwise numerical approximation of stationary solutions of semilinear stochastic evolution equations

Under a one-sided dissipative Lipschitz condition on its drift, a stochastic evolution equation with additive noise of the reaction-diffusion type is shown to have a unique stochastic stationary solution which pathwise attracts all other solutions. A similar situation holds for each Galerkin approximation and each implicit Euler scheme applied to these Galerkin approximations. Moreover, the stationary solution of the Euler schemes converges pathwise to that of the Galerkin system as the stepsize tends to zero and the stationary solutions of the Galerkin systems converge pathwise to that of the evolution equation as the dimension increases. The analysis is carried out on random partial and ordinary differential equations obtained from their stochastic counterparts by substraction of appropriate Ornstein-Uhlenbeck stationary solutions

Non-Autonomous Attractor for Integro-Differential Evolution Equations

We show that infinite-dimensional integro-differential equations which involve an integral of the solution over the time interval since starting can be formulated as non-autonomous delay differential equations with an infinite delay. Moreover, when conditions guaranteeing uniqueness of solutions do not hold, they generate a non-autonomous (possibly) multi-valued dynamical system (MNDS). The pullback attractors here are defined with respect to a universe of subsets of the state space with sub-exponetial growth, rather than restricted to bounded sets. The theory of non-autonomous pullback attractors is extended to such MNDS in a general setting and then applied to the original integro-differential equations. Examples based on the logistic equations with and without a diffusion term are considered