Abstract Fluid boundary is quite common to be noted in engineering, for example, water tank, or the ocean. The tank wall could regarded as rigid wall. Besides, structures submerged water, hydrostatic pressure actually existes, and its effect important especially big level. In this work, hysrostatic are both accounted, natural frequency predicted cylindrical shell near with high pressure. Result...

Class separation of methylated free bile acids from bile acids conjugated with taurine and methylglycine was accomplished using a solvent system of 2,2,4-trimethylpentane-absolute ethanol 10:1 (v/v). By developing a silica thin-layer plate two times with solvent in a Brinkmann sandwich tank, the difficult resolution between methyl cholate and methyl glycolithocholate was achieved. Evidence is p...

The dust shell around the evolved star HD 179821 has been detected in scattered light in near-IR imaging polarimetry observations. Here, we subtract the contribution of the unpolarized stellar light to obtain an intrinsic linear polarization of between 30 and 40 per cent in the shell which seems to increase with radial offset from the star. The J and K band data are modelled using a scattering ...

We investigate the response of conductive and convective ice shells on Europa to variations of heat flux and interior tidal-heating rate. We present numerical simulations of convection in Europa’s ice shell with Newtonian, temperature-dependent viscosity and tidal heating. Modest variations in the heat flux supplied to the base of a convective ice shell, F , can cause large variations of the ic...

This paper describes a technique for analyzing the phenomenon of static buckling pre-loaded complex nano-composite shell. Most works devoted to analysis structures consider vibration processes, while can be an important factor that limits use new materials in space-rocket hardware. A constant-thickness shell consisting two spherical covers and cylindrical body is considered. It acted upon by in...