730 research outputs found
Multiple-relaxation-time Finsler-Lagrange dynamics in a compressed Langmuir monolayer
In this paper an information geometric approach has been proposed to describe
the two-dimensional (2d) phase transition of the first order in a monomolecular
layer (monolayer) of amphiphilic molecules deposited on air/water interface.
The structurization of the monolayer was simulated as an entropy evolution of a
statistical set of microscopic states with a large number of relaxation times.
The electrocapillary forces are considered as information constraints on the
statistical manifold. The solution curves of Euler-Lagrange equations and the
Jacobi field equations point out contracting pencils of geodesic trajectories
on the statistical manifold, which may change into spreading ones, and
converse. It was shown that the information geometrodynamics of the first-order
phase transition in the Langmuir monolayer finds an appropriate realization
within the Finsler-Lagrange framework
Geometrization of the theory of electromagnetic and spinor fields on the background of the Schwarzschild spacetime
The geometrical Kosambi–Cartan–Chern approach has been applied to study the systems of differential equations which arise in quantum-mechanical problems of a particle on the background of non-Euclidean geometry. We calculate the geometrical invariants for the radial system of differential equations arising for electromagnetic and spinor fields on the background of the Schwarzschild spacetime. Because the second invariant is associated with the Jacobi field for geodesics deviation, we analyze its behavior in the vicinity of physically meaningful singular points r = M, ∞. We demonstrate that near the Schwarzschild horizon r = M the Jacobi instability exists and geodesics diverge for both considered problems.The geometrical Kosambi–Cartan–Chern approach has been applied to study the systems of differential equations which arise in quantum-mechanical problems of a particle on the background of non-Euclidean geometry. We calculate the geometrical invariants for the radial system of differential equations arising for electromagnetic and spinor fields on the background of the Schwarzschild spacetime. Because the second invariant is associated with the Jacobi field for geodesics deviation, we analyze its behavior in the vicinity of physically meaningful singular points r = M, ∞. We demonstrate that near the Schwarzschild horizon r = M the Jacobi instability exists and geodesics diverge for both considered problems
Application of hydrogenation to low-temperature cleaning of the Si(001) surface in the processes of molecular-beam epitaxy: Investigation by STM, RHEED and HRTEM
Structural properties of the clean Si(001) surface obtained as a result of
low-temperature (470--650C) pre-growth annealings of silicon wafers in a
molecular-beam epitaxy chamber have been investigated. To decrease the cleaning
temperature, a silicon surface was hydrogenated in the process of a preliminary
chemical treatment in HF and NH_4F aqueous solutions. It has been shown that
smooth surfaces composed by wide terraces separated by monoatomic steps can be
obtained by dehydrogenation at the temperatures > 600C, whereas clean surfaces
obtained at the temperatures < 600C are rough. It has been found that there
exists a dependence of structural properties of clean surfaces on the
temperature of hydrogen thermal desorption and the process of the preliminary
chemical treatment. The frequency of detachment/attachment of Si dimers from/to
the steps and effect of the Ehrlich-Schwoebel barrier on ad-dimer migration
across steps have been found to be the most probable factors determining a
degree of the resultant surface roughness.Comment: 8 pages, 8 figures; version accepted to J. Appl. Phy
Petro fabric characteristics of olivine from xenoliths, peridotites, and basalts (from Canary Islands, Kuznetsk Alatau and Yoko-Dovyren Massif)
This paper presents results of study of petro fabric specific characteristics of olivine from xenoliths, peridotites, and basalts (from Canary Islands, Kuznetsk Alatau and Yoko-Dovyren Massif
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