We present an application of birth-and-death processes on configuration spaces to a generalized mutationselection balance model. The model describes the aging of population as a process of accumulation of mutations in a ...

We analyze the spectral properties of a phenomenological model for a weakly doped two-dimensional antiferromagnet, in which the carriers move within one of the two sublattices where they were introduced. Such a constraint ...

The energy of electrons of univalent and bivalent impurity of a spherical β -HgS/CdS nanoheterostructure is calculated as a function of quantum dot radius by the variation technique in the case of finite and infinite ...

This paper aims to discuss the present understanding of the high frequency dynamics in liquid water, with particular attention to a specific phenomenon – the so-called fast sound – since its first appearance in the literature ...

We propose a pseudospin model for proton glasses of the Rb₁₋x(NH₄)xH₂PO₄(Rb₁₋x(ND₄)xD₂PO₄) type, which takes into account the energy levels of hydrogens (deuterons) around the PO₄ group, long-range interactions between the ...

Statistical theory for ferroelectrics based on triple well anharmonic potential was used for the case of structural second order phase transition in Sn₂P₂S₆ crystals. Parameters of effective Hamiltonian of the model ...

The paper presents the X-ray photoelectron spectra (XPS) of the valence band (VB) and of the core levels (CL) of uniaxial ferroelectric Sn₂P₂S₆ single crystals from different crystallographic planes in both paraelectric and ...