Pressurized elastic shells are ubiquitous in nature and technology, from the outer walls of yeast bacterial cells to artificial pressure vessels. Indentation measurements simultaneously probe internal properties thin shells, serve as a useful tool for strength testing inferring biological functions living cells. We study effects geometry pressure-induced stress on indentation stiffness ellipsoi...

Solenidae are deep burrowing bivalves inhabiting intertidal and shallow sub-tidal soft bottom sediments mostly in tropical and sub-tropical areas. Solen dactylus has a restricted distribution within the Indian Ocean. Solen dactylus is frequently found on the sandy-muddy coast of the northern Persian Gulf, Iran. Specimens of S. dactylus were collected since 2006 from Bandar Abbas to study their ...

We present an analysis of AAVSO visual observations of the Mira variable R Cen from 1918 to 2000. The period of the dominant mode has been steadily decreasing from 550 days at JD 2,434,000 (1951) to its present value of 505–510 days. In the same interval, the pulsational amplitude has decreased by 3 mag, from 5.5–11.8 V to 6.3–9.1 V. We suggest that both are caused by a He-shell flash, as the p...

[1] A cooling viscoelastic ice shell overlying an ocean develops stresses due to two effects: thermal contraction of the ice due to cooling and the expansion of the shell due to the ice-water volume change. The former effect generates near-surface compression and deeper extension; the second effect generates extension only. In both cases, stresses are smaller at depth due to viscous creep. The ...