Voilà maintenant plus de deux ans que dure la crise sanitaire liée au Covid-19 en France, période durant laquelle des contraintes inédites ont été mises place pour y faire face : confinement, restriction déplacements, obligation port d’un masque, vaccinale certains citoyens, etc. Si l’épidémie n’a pas disparu, elle semble d&#23...

Catastrophic events are considered a major contributor to extinction threats, yet are rarely explicitly estimated in population models. We extend the basic state–space population dynamics model to include a mixture distribution for the process error. The mixture distribution consists of a “normal” component, representing regular process error variability, and a “catastrophic” component, represe...

We analyze the time evolution of a one-dimensional quantum system with an attractive delta function potential whose strength is subjected to a time periodic (zero mean) parametric variation η(t). We show that for generic η(t), which includes the sum of any finite number of harmonics, the system, started in a bound state will get fully ionized as t → ∞ irrespective of the magnitude or frequency ...