Thick shells have attracted much attention in recent years as intelligent and functional graded materials because of their unique properties. In this review paper, some critical issues and problems in the development of thick shells made from Functionally graded piezoelectric material (FGPM) are discussed. This review has been conducted on various types of methods which are available for thick ...

The gauge usually adopted for extracting the reduced Hamiltonian of a thin spherical shell of matter in general relativity, becomes singular when dealing with two or more intersecting shells. We introduce here a more general class of gauges which is apt for dealing with intersecting shells. As an application we give the hamiltonian treatment of two intersecting shells, both massive and massless...

BACKGROUND The shells of molluscs survive well in many sedimentary contexts and yield information about the diet of prehistoric humans. They also yield evidence of symbolic behaviours through their use as beads for body adornments. Researchers often analyse the location of perforations in shells to make judgements about their use as symbolic objects (e.g., beads), the assumption being that hole...

Polyimide shells are used as targets in Inertial Confinement Fusion (ICF) experiments. These shells are filled with DT gas, then cooled to low temperatures for cryogenic laser shots. During target preparation, shells require careful pressure and temperature control due to their sensitivity. The pressure is governed partly by permeation through the shell wall, which can only be determined with t...

When I woke up on the morning of Tuesday 27th June 2000, I noticed no change at all. I telephoned a few friends and they confirmed that their lives were not much different that morning. One said he had a slight hangover but he could account for this minor deviation. For years we had been told that once we had the sequence of the human genome, everything would change. So how come after the rough...

We introduce the notion of empty alternation by investigating alternating automata which are restricted to empty their storage except for a logarithmically space-bounded tape before making an alternating transition. In particular, we consider the cases when the depth of alternation is bounded by a constant or a polylogarithmic function. In this way we get new characterizations of the classes AC...

Recent work (Hu and Black (2005, 2007, 2008); Dekel and Wolinsky (2012)) has detailed the twin issues of empty voting and hidden/morphable ownership. The former arises when an actor has control rights over a corporation but no economic interest in that corporation, such as when an investor borrows shares. The latter arises when a shareholder has an economic or voting interest in a corporation b...

Thin shells are found in nature at scales ranging from viruses to hens' eggs; the stiffness of such shells is essential for their function. We present the results of numerical simulations and theoretical analyses for the indentation of ellipsoidal and cylindrical elastic shells, considering both pressurized and unpressurized shells. We provide a theoretical foundation for the experimental findi...

Abstract The link between the evolution of advanced sociality and cognition has been an important concept across fields taxonomic boundaries. However, in many study systems, ecological phylogenetic confounds impair evolutionary inferences drawn when comparing social organization. Here, we highlight value shell-dwelling Lamprologine cichlids Lake Tanganyika studies cognitive evolution. These spe...

HI observations have revealed in several shell galaxies the presence of gaseous shells slightly displaced from the stellar shells radially, in the outward direction. We propose a mechanism to form this gaseous shells, based on the well-known phase-wrapping process of the companion matter in a merger, with nearly radial orbits. The mechanism relies on the existence of a clumpy interstellar matte...