Problem. The article presents the results of studies stability a three-layer cylindrical shell. Factors that have significant impact on strength and shell were taken into account, namely reduced modules elasticity wall. Goal. purpose study is to develop methodology for calculating shell, which will significantly improve calculation practice such structures in relation determining critical exter...

We discuss effects of fluctuation geometry on primordial nucleosynthesis. For the first time we consider condensed cylinder and cylindrical-shell fluctuation geometries in addition to condensed spheres and spherical shells. We find that a cylindrical shell geometry allows for an appreciably higher baryonic contribution to be the closure density (Ωbh 2 50 < ∼ 0.2) than that allowed in spherical ...

We discuss effects of fluctuation geometry on primordial nucleosynthesis. For the first time we consider condensed cylinder and cylindrical-shell fluctuation geometries in addition to condensed spheres and spherical shells. We find that a cylindrical shell geometry allows for an appreciably higher baryonic contribution to be the closure density (Ωbh50 < ∼ 0.2) than that allowed in spherical inh...

Using multi-layers method (MLM), a semi-analytical solution have been derived for determination of displacements and stresses in a thick cylindrical shell with variable thickness under non-uniform pressure. Three different profiles (convex, linear and concave) are considered for the variable thickness cylinder. Given the existence of shear stress in the thick cylindrical shell due to thickness ...