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Uzhhorod, Ukraine

Kozak M.I.,Uzhgorod National University
Progress in Electromagnetics Research Letters | Year: 2015

A new method of electrodynamic analysis of gyrotropic (isotropic and anisotropic) media is developed. This method is based on the scalar representation of Maxwell’s equations corresponding to 4 * 4-matrix formulation and coupling equations for gyrotropic medium in the Drude’s form. It is utilized by solving the wave equations of second and fourth order, followed by cross-linking the fields at the boundary. The obtained results are experimentally verified by their good matching with the popular benchmark data, such as quartz rotatory power and in comparison with a known standard parameter of an optical element, such as λ/4-plate. This method simply summarizes the polarimetric and ellipsometric calculations. © 2015, Electromagnetics Academy. All rights reserved.

Trunov M.L.,Uzhgorod National University | Lytvyn P.M.,Institute of Semiconductor Physics of Ukraine | Dyachyns'Ka O.M.,Institute of Semiconductor Physics of Ukraine
Applied Physics Letters | Year: 2010

We present direct measurements of the kinetics of surface relief gratings (SRGs) formation in amorphous As20Se80 thin films observed in real time by in situ atomic force microscopy. SRGs are induced in different holographic schemes of recording using near band-gap light and enhanced additionally by light polarized orthogonally to the recording beams. We demonstrate that the direction of mass transport depends on the polarization of additional light and recording pattern and can be driven by their modulation. Additional light triggers a giant mass transport and accelerates SRG formation while increasing it in height up to the order of the film thickness. © 2010 American Institute of Physics.

Sidey V.,Uzhgorod National University
Acta Crystallographica Section B: Structural Science | Year: 2013

For the crystal structures of oxoborates, the value of ∼1.2 Å can be regarded as the lower physical limit for BIII-O bond lengths. The oxoborate crystal structures with BIII-O bond lengths shorter than ∼1.2 Å have been found to be either doubtful or clearly erroneous. © 2013 International Union of Crystallography Printed in Singapore-all rights reserved.

Sidey V.,Uzhgorod National University
Acta Crystallographica Section B: Structural Science | Year: 2012

The calculation scheme for determining the bond-valence parameters (r 0 and b) resulting in the exact solution of the bond-valence sum rule for a given set of coordination shells is presented. © 2012 International Union of Crystallography Printed in Singapore - all rights reserved.

Petrov A.N.,Moscow State University | Lompay R.R.,Uzhgorod National University
General Relativity and Gravitation | Year: 2013

A construction of conservation laws and conserved quantities for perturbations in arbitrary metric theories of gravity is developed. In an arbitrary field theory, with the use of incorporating an auxiliary metric into the initial Lagrangian covariantized Nœther identities are carried out. Identically conserved currents with corresponding superpotentials are united into a family. Such a generalized formalism of the covariantized identities gives a natural basis for constructing conserved quantities for perturbations. A new family of conserved currents and correspondent superpotentials for perturbations on arbitrary curved backgrounds in metric theories is suggested. The conserved quantities are both of pure canonical Nœther and of Belinfante corrected types. To test the results each of the superpotentials of the family is applied to calculate the mass of the Schwarzschild-anti-de Sitter black hole in the Einstein-Gauss-Bonnet gravity. Using all the superpotentials of the family gives the standard accepted mass. © 2012 Springer Science+Business Media New York.

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