Stochastic finite element technique for stochastic one-dimensional time-dependent differential equations with random coefficients.
Structural discontinuities to approximate some optimization problems with a nonmonotone impulsive character
In some preceding works we consider a class of Boltz optimization problems for Lagrangian mechanical systems, where it is relevant a line , regarded as determined by its (variable) curvature function of domain . Assume that the problem is regular but has an impulsive monotone character in the sense that near each of some points to is monotone and is very large. In [10] we propose a procedure belonging to the theory of impulsive controls, in order to simplify into a structurally...
Structure theory for second order 2D superintegrable systems with 1-parameter potentials.
Structures symplectiques singulières génériques
Soit une variété différentiable de dimension paire munie d’une 2-forme différentielle fermée générique . L’apparition éventuelle d’un lieu de dégénérescence du rang de est l’obstacle à ce que soit une structure symplectique. Nous étudions les propriétés géométriques de et nous caractérisons l’algèbre des hamiltoniennes admissibles de i.e. les fonctions différentiables qui possèdent un champ hamiltonien sur .
Study of nonlinear wave processes in plasmas using the formalism of a special Lorentz transformation for a space-independent frame.
Su di un sistema dissipativo soggetto a forze dipendenti dal tempo
Su un problema più generale di quello di De Brun per il moto di un corpo rigido intorno a un punto fisso.
Su una classe di precessioni generalizzate semiregolari del solido pesante
Su una classe di precessioni semiregolari del satellite girostatico in orbita circolare
Subharmonics near an equilibrium point for Hamiltonian systems.
Sufficiency Conditions Under Which a Lagrangian is an Ordinary Divergence.
Sugli atti di moto, eventualmente isocori, più rigidi possibile
Sui moti di precessione di un corpo rigido
Sui moti polinomiali
Sul collasso di un ammasso di materia disgregata. Nota I
Starting from the considerations developed in [4], it is shown that the only forces at a distance exerted among the elements of an isolated spherical cluster of incoherent matter which, preserving homogeneity, is collapsing are those expressed by Newton's law of gravitation and those of the elastic type. Furthermore the reverse is shown, that is if the forces at a distance are of these two types during the collapse the homogeneity is preserved.
Sul collasso di un ammasso di materia disgregata. Nota II
With reference to Nota I, the hypothesis that the cluster is spherical is substituted by the hypothesis that it has an isotropic behaviour with respect to a given frame of reference with origin in an element internal to . The kinematical behaviour of during the collapse with respect to the frames of reference with origin in the elements of and in translatory motion with respect to is studied. This behaviour is the same with respect to each of such frames, which are in translatory motion...
Sul moto di un giroscopio in un campo gravitazionale centrale
Sul problema del rimbalzo in un insieme convesso
In the present paper we seek the bounce trajectories in a convex set which assume assigned positions in two fixed time instants. We find sufficient conditions in order to obtain the existence of infinitely many bounce trajectories.
Sul teorema di Liouville per deformazioni conformi
Sul vettore caratteristico della rotazione nei moti rigidi