SU(3)-invariant “spin” chains with a single impurity, such as a modified exchange coupling on one link, are analyzed using boundary conformal field theory techniques. These chains are equivalent to a special case of the “tJV ” model, i.e. the tJ model with a nearest neighbour repulsion added. In the continuum limit they are equivalent to two free bosons at a special value of the compactificatio...

Continuum methods for representing skin and proximity effects in round-wire windings have been previously presented in the literature. Although the economy of these methods is well-established, the existing approaches require preliminary numerical field computations to determine the equivalent material properties of the wound region. The present work derives approximate but closed-form expressi...

Matrix models have been shown to be equivalent to noncommutative field theories. In this work we study noncommutative X-Y model and try to understand Kosterlitz Thouless transition in it by analysing the equivalent matrix model. We consider the cases of a finite lattice and infinite lattice separately. We show that the critical value of the matrix model coupling is identical for the finite and ...

We propose a discrete traffic flow model with discrete time. Continuum limit of this model is equivalent to the optimal velocity model. It has also an ultradiscrete limit and a piecewise-linear type of traffic flow model is obtained. Both models show phase transition from free flow to jam in a fundamental diagram. Moreover, the ultradiscrete model includes the Fukui–Ishibashi model in a special...

This paper describes a continuum model for analyzing the inelastic behavior of a single walled carbon nanotube (SWCNT) in different loading conditions. Because of limitations in using molecular dynamics (and other atomic methods) to model the failure load of the SWCNT, continuum mechanics methods are considered in this paper. Based on some experimental and theoretical results, an elasto-plastic...

in this paper, the mechanical behavior of three-phase inhomogeneous materials is modeled using the meso-scale model with lattice beams for static and dynamic analyses. the timoshenko beam theory is applied instead of the classical euler-bernoulli beam theory and the mechanical properties of lattice beam connection are derived based on the continuum medium using the non-local continuum theory. t...

In this work, an equivalent continuum of a barrel gridshell is introduced. Constitutive identification procedures based on periodic homogenization are provided in the literature for purpose, flat Representative Element Volume (REV), notwithstanding that geometry structures concerned curved. Therefore, novelty present study selection curved REV to obtain elastic constants. The numerical validati...

this research has tried to find most proper leadership styles based on a approved model to direct hospital manpower appropriately. the main objective of this research was the comparison between manager’s existing leadership styles and suggested styles to them in order to direct existing styles toward suggested ones. in this cross- sectional study all qom province hospital managers participated....