Analisi, modellazione e previsione della disposizione di uccelli su cavi elettrici

Abstract

The problem addressed is "the spontaneous arrangement of birds on a wire horizontally." We evaluated several models and, starting from biological and ethological basis, we defined a new one then checked for consistency with experimental observations. The starting model, chosen as a reference, has been the one proposed by Piccoli-Cristiani-Frasca characterized by the following aspects:  the velocity of movement of each entity within the group depends on the local interactions between the individuals themselves;  interactions are mainly attractive and repulsive forces;  hierarchies do not exist among individuals (there isn't any leader);  each individual is affected only by individuals who fall within its "sphere of influence" (you can model not-symmetrical interactions, since an individual may fall within the zone of influence of another individual which, however, is out of the sensitive area of the first one);  each individual is affected only by the n closest individuals... [edited by author]