Semiclassical analysis of shell structures in realistic nuclear potentials are presented using periodicorbit theory. We adopted r potential model and examined classical-quantum correspondence using Fourier transformation technique. Spin-orbit coupling is also taken into account in the model Hamiltonian. Gross shell structure for a certain combination of surface diffuseness and spin-orbit parame...

In the present paper we demonstrate that there exists a fully microscopic shell-model counterpart of Bohr-Mottelson model by embedding latter in theory atomic nucleus within framework recently proposed proton-neutron symplectic (PNSM). For this purpose, another coupling scheme PNSM is considered which basis states are classified algebraic structure $SU(1,1) \otimes SO(6)$. It shown configuratio...

This paper presents a simple methodology for cost estimation of a near optimal heat exchanger network, which comprises mixed materials of construction. Intraditional pinch technology and mathematical programming it is usually assumed that all heat exchangers in a network obey a single cost model. This implies that all heat exchangers  in a network are of the same type and use the same mate...

In this study, the behavior of a composite lattice cylindrical shell is investigated in the buckling deforming. Also, the distribution of shell buckling response and the stress field is studied after making some defects on the ribs.Therefore using ANSYS software, a 3D finite element model of the shell has been created for the analysis. Material properties and geometrical data of the shell are o...

In the polyspheron theory of nuclear structure,' approximate wave functions for the normal state and some excited states of nuclei are constructed of localized is orbitals occupied by one to four nucleons; a nucleus is described in terms of deuterons, tritons, trelions,2 and helions,3 as well as neutrons and protons not included in these clusters (spherons). In the following paragraphs I point ...

Context. Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence for a merger event. Accurate photometry at high spatial resolution is needed to learn on presence of inner shells, population properties of shells, and dust in shell galaxies. Aims. Learn more about the origin of shells and dust in early type galaxies. Methods. V-I colours of shells and underlyi...

Thin solid shell contrast agents bubbles are expected to undergo different volume oscillating behaviors when the acoustic power is increased: small oscillations when the shell remains spherical, and large oscillations when the shell buckles. Contrary to bubbles covered with thin lipidic monolayers that buckle as soon as compressed: the solid shell bubbles resist compression, making the buckling...