Apical constriction is one of the fundamental mechanisms by which embryonic tissue is deformed, giving rise to the shape and form of the fully-developed organism. The mechanism involves a contraction of fibres embedded in the apical side of epithelial tissues, leading to an invagination or folding of the cell sheet. In this article the phenomenon is modelled mechanically by describing the epith...

Understanding the evolution of level densities in crossover from spherical to well-deformed nuclei has been a long-standing problem nuclear physics. We measure for chain neodymium isotopes $^{142,144-151}$Nd which exhibit such crossover. These results represent date most complete data set an isotopic between neutron shell-closure and towards mid-shell. observe strong increase along with overall...

We study the stability of polymer-shelled bubbles with controlled dimensions generated from air-in-oil-inwater (A/O/W) compound bubbles. We show that the ratio of the shell thickness to bubble radius is critical in generating un-deformed polymer-shelled bubbles from A/O/W compound bubbles. In addition, the effects of shell stiffness and encapsulated gas on bubble stability are also investigated...

Attention is focused in this paper on: (i) definitions of alternate measures of “stress-resultants” and “stress-couples” in a finitely deformed shell (finite mid-plane stretches as well as finite rotations); (ii) mixed variational principles for shells, undergoing large mid-plane stretches and large rotations, in terms of a stress function vector and the rotation tensor. In doing so, both types...

We investigate the collapse of a spherical shell of matter in an anti-de Sitter space. We search for a holographic description of the collapsing shell in the boundary theory. It turns out that in the boundary theory it is possible to find information about the radial size of the shell. The shell deforms the background spacetime, and the deformed background metric enters into the action of a gen...

The damping of collective rotational motion is studied microscopically, making use of shell model calculations based on the cranked Nilsson deformed mean-field and on residual two-body interactions, and focusing on the shape of the gamma-gamma correlation spectra and on its systematic behavior. It is shown that the spectral shape is directly related to the damping width of collective rotation, ...

A shape sensitive, variational approach for the matching of surfaces considered as thin elastic shells is investigated. The elasticity functional to be minimized takes into account two different types of nonlinear energies: a membrane energy measuring the rate of tangential distortion when deforming the reference shell into the template shell, and a bending energy measuring the bending under th...

A major property of confined Fermi system is the quantisation of single particle motion. It leads to a bunching of levels in the single particle spectrum, known as shells, and gives rise to magic numbers in finite Fermi systems. Consequently, a spherical symmetry leads to very strong shell effects manifested in the stability of the noble gases, nuclei and metallic clusters [1, 2]. Recently the ...

In this work nuclei along N=Z line are of interest as transitions from spherical to deformed shapes are expected to occur when going across the medium mass region. In this respect a strong sudden shape transition between deformation is predicted to occur in the region N=Z as well as N>Z nuclei. New shell gaps are predicted using nucleon and two-nucleon separation energies and the shape evaluati...

A theoretical and experimental study of the spin-over mode induced by the elliptical instability of a flow contained in a slightly deformed rotating spherical shell is presented. This geometrical configuration mimics the liquid rotating cores of planets when deformed by tides coming from neighboring gravitational bodies. Theoretical estimations for the growth rates and for the non linear amplit...