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Your search keyword '"Tatiana V. Aksenova"' showing total 3 results
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3 results on '"Tatiana V. Aksenova"'

1. Crystal Structure and Properties of Gd1-xSrxCo1-yFeyO3-δ Oxides as Promising Materials for Catalytic and SOFC Application

Author

Tatiana V. Aksenova, Darya K. Mysik, and Vladimir A. Cherepanov

Subjects
solid solution, X-ray diffraction, crystal structure, thermogravimetric analysis, oxygen nonstoichiometry, conductivity, Chemical technology, TP1-1185, Chemistry, QD1-999
Abstract

A series of samples with the overall composition Gd1-xSrxCo1-yFeyO3-δ (x = 0.8; 0.9 and 0.1 ≤ y ≤ 0.9), which are promising materials for catalytic and SOFC application, was prepared by a glycerol nitrate technique. X-ray diffraction analysis allowed to describe Gd0.2Sr0.8Co1-yFeyO3-δ with 0.1 ≤ y ≤ 0.5 in a tetragonal 2ap × 2ap × 4ap superstructure (SG I4/mmm), while oxides with 0.6 ≤ y ≤ 0.9 exhibit cubic disordered perovskite structure (SG Pm-3m). All Gd0.1Sr0.9Fe1-yCoyO3-δ oxides within the composition range 0.1 ≤ y ≤ 0.9 possess the cubic perovskite structure (SG Pm-3m). The structural parameters were refined using the Rietveld full-profile method. The changes of oxygen content in Gd1-xSrxCo1-yFeyO3-δ versus temperature were determined by thermogravimetric analysis. The introduction of iron into the cobalt sublattice leads to a gradual increase in the unit cell parameters and unit cell volume, accompanied with increasing oxygen content. The temperature dependency of conductivity for Gd0.2Sr0.8Co0.3Fe0.7O3-δ exhibits a maximum (284 S/cm) at ≈600 K in air. The positive value of the Seebeck coefficient indicates predominant p-type conductivity in the Gd0.2Sr0.8Co0.3Fe0.7O3-δ complex oxide.

Published
2022
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2. Specificity of US President J. Biden’s Evaluativity of the Black Lives Matter Protest Movement in Social and Political Discourse

Author

Tatiana V. Aksenova and Bulat Kh. Chapaev

Subjects
Mechanical Engineering, Energy Engineering and Power Technology, Management Science and Operations Research
Abstract

Introduction. Due to the development of information and communication technologies, the impact of the media on the population has increased significantly. Journalistic discourse implements one of its main functions – the function of influence and manipulation – by referring to various means of evaluation. In this case, any object or phenomenon of reality, as well as current events, can be evaluated. Materials and Methods. This work examines the evaluative lexical-semantic units that describe the attitude of the 46th President of the United States, J. Biden, to the events of 2020 associated with the Black Lives Matter protest movement. Practical material is selected from influential American news portals. Research methods include the continuous sampling method and the method of contextual analysis. Results. In the course of the study, components of an evaluative nature were selected. An analysis was given of the purpose of evaluative tools in a particular context, and the evolution of the attitude of the English-language media to the position of J. Biden in connection with the Black Lives Matter movement was traced. Discussion and Conclusion. Based on the results of the study, a conclusion was made about the significant role of the media in shaping public opinion. The evolution of the media’s attitude to the president’s position is traced.

Published
2022

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