A model of the optical media with a spatially structured Kerr nonlinearity is introduced. The nonlinearity strength is modulated by a set of singular peaks on top of a self-focusing or defocusing uniform background. The peaks may include a repulsive or attractive linear potential too. We find that a pair of mutually symmetric peaks readily gives rise to the spontaneous symmetry breaking (SSB) o...

We investigate classes of systems based on different interaction patterns with the aim of achieving distributability. As our system model we use Petri nets. In Petri nets, an inherent concept of simultaneity is built in, since when a transition has more than one preplace, it can be crucial that tokens are removed instantaneously. When modelling a system which is intended to be implemented in an...

Starting from a rate-equation model proposed by Beenakker, we calculate current-voltage characteristics for symmetric and asymmetric vertical quantum dots. We include up to 26 electrons and show how single-electron charge interaction, inelastic scattering, and nonadiabatic subband mixing can enhance the valley current signi6cantly by opening new conduction channels. Subband mixing is the domina...

introduction: poor sensitivity and poor signal to noise ratio because of low injected thallium dose and presence of scattered photons are the main problems in using thallium in scintigraphic imaging of the heart. scattered photons are the main cause of degrading the contrast and resolution in spect imaging that result in error in quantification. thallium decay is very complicated and photons ar...

In present study is concerned with the propagation of axisymmetric vibrations in a homogenous isotropic micropolar thermoelastic cubic crystal plate bordered with layers or half spaces of inviscid liquid subjected to stress free boundary conditions in context of Lord and Shulman (L-S) and Green and Lindsay (G-L) theories of thermoelasticity. The secular equations for symmetric and skew-symmetri...

In this paper, the well-known proportional hazards model which includes several well-known lifetime distributions such as exponential,Pareto, Lomax, Burr type XII, and so on is considered. With both Bayesian and non-Bayesian approaches , we consider the estimation of parameters of interest based on progressively Type-II right censored samples. The Bayes estimates are obtained based on symmetric...

We theoretically investigate $\mathcal{PT}$ symmetry, induced mechanical lasing, and force sensing in an optically levitated nanoparticle with coupled oscillation modes. The coupling the system is created by modulation of asymmetric optical potential plane transverse to beam trapping nanoparticle. show that such a can lead $\mathcal{PT}$-symmetric behavior for experimentally realistic parameter...

In this work, we examine the effects of methane, on normal modes water. We find methane has a weaker influence water modes. estimate vibrational density states and infrared spectral density. decompose these based different characters. observe general decrease in intensity throughout stretch region methane-water system compared to bulk data. This lower reflects reduction number average molecules...