We extend the mechanism for noise-induced phase transitions proposed by Ibañes et al. [Phys. Rev. Lett. 87, 020601 (2001)] to pattern formation phenomena. In contrast with known mechanisms for pure noise-induced pattern formation, this mechanism is not driven by a short-time instability amplified by collective effects. The phenomenon is analyzed by means of a modulated mean field approximation ...

We analyze pattern formation in doubly resonant intracavity second-harmonic generation in the presence of competing nondegenerate parametric downconversion. We show that for positive cavity detuning of the fundamental frequency the threshold for parametric oscillation is lower than that of transverse, pattern forming instabilities. The parametric oscillation strongly modifies the pattern dynami...

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Embodied pedagogical agents – v sually represented, computer generated characters n pedagog cal roles, such as v rtual nstructors, mentors and learn ng compan ons – populate the d g tal soc ety n ncreas ng numbers. They are found n educat onal programmes from preschool to un vers ty, as well as n broader educat onal contexts n the form of med cal counsellors, v rtual health coaches, nformat on ...