Ab initio calculations of optical constants of GaSe and InSe layered crystals

The dielectric functions, refractive indices, and extinction coefficients of GaSe and InSe layered crystals have been calculated within the density functional theory. The calculations have been performed for the values of theoretical structural parameters optimized using the exchange-correlation functional, which allows one to take into account the dispersion interactions. It has been found that optical functions are characterized by the most pronounced polarization anisotropy in the range of photon energies of ∼4–7 eV. The frequency dependences for InSe compound in the range up to 4 eV demonstrate the more pronounced anisotropy as compared to GaSe. The results obtained for GaSe crystal agree better with the experimental data as compared to the previous calculations

Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit

We report on the observation of a new spin mode in a quantum Hall system in the vicinity of odd electron filling factors under experimental conditions excluding the possibility of Skyrmion excitations. The new mode having presumably zero energy at odd filling factors emerges at small deviations from odd filling factors and couples to the spin-exciton. The existence of an extra spin mode assumes a nontrivial magnetic order at partial fillings of Landau levels surrounding quantum Hall ferromagnets other then the Skyrmion crystal.Comment: 9 pages, 4 figure

Development of human capital in the system of economic categories of work

Today, human capital is one of the main factors in the formation of the knowledge economy, which is the highest stage in the development of an innovative, post-industrial economy. The development of intellectual and spiritual capabilities of a person, as well as the accumulation of human capital, which has a strong influence on the productivity and quality of labor, becomes one of the priorities for the future development of the state. This article discusses the development of human capital in the system of economic categories of labor.peer-reviewe

Structure parameters and magnetic properties of nanosized strontium hexaferrite prepared by the sol-gel combustion method

The phase composition, structure parameters, and main magnetic characteristics of SrFe12O19 hexaferrite prepared by the sol-gel combustion method in combination with subsequent annealing at the temperature of 850°C for 6 hours are investigated. From the study of the magnetization curves in the pulsed magnetic fields the value of saturation magnetization of synthesized material was determined. The value of the magnetocrystalline anisotropy field was determined from the survey of the ferromagnetic resonance

Economic and political fundamentals for the establishment of the cabinet-owned metallurgical complex in Siberia in the 18th century

Economic and political fundamentals for the development of mining and metallurgical production in Siberia in the 18th century are discussed in this paper. The principal type of ownership of large enterprises at that time was serf manufactory, the development of which took place in the conditions of absolutism based on forced labor. Based on a comprehensive set of archive documents, the authors have studied the problem of the transfer under the authority of the Imperial Cabinet of the private Kolyvano-Voskresensk enterprises owned by Demidov, which were established in the 1720s in the south area of Western Siberia. The status change of industrial enterprises is discussed in the context of accidental events (the death of Akinfiy Demidov and the controversy of his heirs) and the consistent processes of development of silver smelting production in the country. The quick development of the metallurgical industry in Russia in the 18th century was caused by a number of domestic and external factors. The Crown extensively attracted private sector capital for the search and development of ore deposits, especially in remote Uralian and Siberian areas. In the 1720s-1740s, the Kolyvano-Voskresensk industrial-territorial complex privately owned by Akinfiy Demidov was established in the south area of Western Siberia. In the middle of the 1740s, the events happened, as a result of which the possessory belonging of the enterprises was changed and these enterprises were transferred under the control and management of the governmental institution – that is, the Imperial Cabinet. Thus, the Kolyvano-Voskresensk plants became the basis of the Cabinet production unit which existed in the 18h-19th centuries.peer-reviewe