Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It’s highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more

Anisotropic Exchange in LiCu2O2{\bf LiCu_2O_2}

We investigate the magnetic properties of the multiferroic quantum-spin system LiCu$_2$O$_2$ by electron spin resonance (ESR) measurements at $X$- and $Q$-band frequencies in a wide temperature range $(T_{\rm N1} \leq T \leq 300$\,K). The observed anisotropies of the $g$ tensor and the ESR linewidth in untwinned single crystals result from the crystal-electric field and from local exchange geometries acting on the magnetic Cu$^{2+}$ ions in the zigzag-ladder like structure of LiCu$_2$O$_2$. Supported by a microscopic analysis of the exchange paths involved, we show that both the symmetric anisotropic exchange interaction and the antisymmetric Dzyaloshinskii-Moriya interaction provide the dominant spin-spin relaxation channels in this material.Comment: 10 pages, 10 Figure

Structural and magnetic dimers in the spin-gapped system CuTe2O5

We investigated the magnetic properties of the system CuTe2O5 by susceptibility and electron spin resonance measurements. The anisotropy of the effective g-factors and the ESR linewidth indicates that the anticipated structural dimer does not correspond to the singlet-forming magnetic dimer. Moreover, the spin susceptibility of CuTe2O5 can only be described by taking into account interdimer interactions of the same order of magnitude than the intradimer coupling. Analyzing the exchange couplings in the system we identify the strongest magnetic coupling between two Cu ions to be mediated by super-super exchange interaction via a bridging Te ligand, while the superexchange coupling between the Cu ions of the structural dimer only results in the second strongest coupling

DESIGN AND DEVELOPMENT OF HETEROGENEOUS CATALYSTS FOR CHEMO- AND REGIOSELECTIVE OXIDATIONS USING SUSTAINABLE OXIDANTS (H2O2, O2)

Epoxidation of alkenes is a reaction of a great interest since epoxides are versatile and useful intermediates in fine chemical synthesis. However, nowadays, in the epoxidation of alkenes, hazardous oxidants are still commonly employed. This is the reason why the development of new epoxidation methods which employ safer oxidants and produce little waste are greatly requested. The present PhD thesis is mainly focused on the design and development of efficient and robust heterogeneous catalysts for epoxidation reactions using TBHP, H2O2 or, in the best case, molecular O2 or air as oxidants. The work is divided into six parts. In all topics the major attention is paid on the design and development of heterogeneous catalyst for the epoxidation reactions. Ti(IV)-heterogeneous silicas were successfully synthesized by the grafting procedure. It was found that all catalysts are active in epoxidation reactions with aq. H2O2 thanks to the applied slow dropwise addition protocol. Moreover, the effect of Ti modification surrounding on the catalytic performance was studied. Also the synthesis of the model compound (Ti-POSS/SiO2) was carried out. This model can be a powerful tool for studying the mechanism of the epoxidation reaction. The last two parts of the manuscript are focused on the in situ H2O2 production by means of GOx or Au-nanoparticles. For this, the encapsulation of GOx was carried out and it\u2019s combined use with Ti(IV)-silica catalysts was tested in the oxidation reactions both in aqueous and organic media. Activation of molecular O2 by means of Au-nanoparticles was also studied. The effect of various factors, such as the role of Au nanoparticles\u2019 size, the solvent\u2019s nature or the pH during the catalyst preparation, was studied

Investment resources of the mining and metallurgical complex: management features, analysis of the composition, structure and sources of their formation

In the conditions of the modern economy, an especially important area of economic activity of any company is its investment activity, which is associated with the investment of certain funds in the implementation of both long-term and medium-term projects. Without increasing in the receipt of financial resources from various sources used for investment, it is impossible to achieve the largescale goals of innovative, technological and information development of the socio-economic sphere in Russia. The purpose of this article is to study the specifics of the management of investment resources of metallurgical and mining companies in the country, as well as the analysis of the composition, structure of their investment resources and sources of their formation. The methods of comparative analysis, a systematic approach to the study of information, graphical methods are used. This article considers the factors affecting the efficiency of investment activities of mining and metallurgical enterprises. The measures for the implementation of the strategy of sustainable development are proposed. The features of the formation of the composition and structure of investment resources of companies in the industry are revealed

Russia’s banking sector during the pandemic

Quarantine and self-isolation have become a new challenge for the Russian economy, changed many areas of our life, revealed new weaknesses in the banking system and monetary regulation of the economy, and also become a good test for the post-crisis financial system. In this article using a systematic approach to the study of information, analytical and graphical methods the dynamics of the Russian banking sector during the development of the coronavirus pandemic and the specifics of recovery from the crisis have been investigated. The innovations and improvements brought about by the pandemic have been studied. The Central Bank of Russia’s monetary policy instruments used to mitigate the impact of the pandemic on the real economy in general and on the banking sector in particular have been reviewed. The features of anti-crisis measures taken by the monetary authorities in our country have been revealed

The “Digital Economy of the Russian Federation” national program as a support mechanism for the Russian information technology industry

The current pace of information technology development of the economy has a significant impact on the social life. This explains the necessity of using a scientific approach to assess the effectiveness of the implementation of the “Digital Economy of the Russian Federation” national program as a tool of government regulation of the economy and determines the high relevance of the topic of the study. The goal of the article is to identify significant areas of regulation of the Russian information technology industry on the basis of the assessment carried out. The objective of the study was to perform comprehensive analysis of the economic situation of the Russian Federation using the example of the information technology industry and to propose measures aimed at addressing imbalances in the industry’s advancement. The author of the article examined performance indicators of the industry and provided a description of the national program under study. The econometric model constructed revealed a high level of influence that program implementation measures have on the competitiveness of the industry

COVID-19 pandemic as a socio-psychological influence on transformations in religion

This article aims to establish COVID-19’s sociopsychological influence on religion. This interdisciplinary study’s theoretical framework embraces the socialecological systems framework, the concept of deprivation, the theory of religious myth-making, religious individualism and bricolage, as well as the concept of quality of life. A sociological survey was conducted of 4,700 residents of Moscow and the Moscow region. The results revealed that the social sphere of society was relatively stable duringthe pandemic. Exploring COVID-19’s socio-psychological influence, this study examines transformations in religion that resulted from tactile deprivation.&nbsp