плотность

Indices in Dynamical System (B, δ) of Binary Vectors

Authors: Vlasova A. V.

An algorithm is proposed for computation of indices of states in dynamical system (B, δ), whose states are binary vectors and evolutional function δ transforms vectors according to the following rules: the initial component 0 (if exists) is replaced by 1, every digram 10 by 01, and the final 1 (if exists) by 0. Correctness of the algorithm is proven..

The Parametric Oscillations of Heterogeneous Round Cylindrical Shell of Variable Density on Different Boundary Conditions

Authors: Mochalin A. A.

We consider an isotropic cylindrical shell of varying thickness and density along the generatrix. Let the shell be under pressure, which is symmetric and also varying along the generatrix. We follow the polupostamenty theory by V. Z. Vlasov and consider the problem of the dynamical stability of the shell. We obtain the exact solution corresponding to the certain relation between thickness, pressure and density.