The design of water-stable photo and electrocatalysts of metal-organic frameworks (MOFs) for its promising catalytic applications at long-term irradiations or persisted current loads is extremely ...necessary but still remains as challenging. A limited number of reports on Ti-MOF-based catalysts for water splitting are only available to explain and understand the correlation between the nature of materials and MOFs array. Herein, spherical Ti-MOFs and corresponding partially annealed hollow core-shell Ti-MOFs (Ti-MOF/D) are designed and the correlation with their photo(electro)catalytic water splitting performance is evaluated. The switchable valence state of Ti for the Ti-MOF as a function of molecular bonding is the possible reason behind the observed photocatalytic hydrogen generation and light-harvesting ability of the system. Besides, the defect state, solid core-shell mesoporous structure, and active sites of Ti-MOF help to trap the charge carriers and the reduction of the recombination process. This phenomenon is absent for hollow core-shells Ti-MOF/D spheres due to the rigid TiO
outer surface although there is a contradiction in surface area with Ti-MOF. Considering the diversity of Ti-MOF and Ti-MOF/D, further novel research can be designed using this way to manipulate their properties as per the requirements.
The study in this article is a study of rural employment in the informal economy. It is based on the data from the following surveys of households and individuals:“Comprehensive monitoring of the ...population's living conditions” and “Selective monitoring of income and participation in social programs”, both carried out by Rosstat during the years 2011–2016 and commissioned by the Russian government. Rural residents ages 16 and up were interviewed in every region of 9 Federal districts, including the Crimean Federal district. A decrease in the level of rural inhabitants employed in farming together with an increase in other fields of the agro-industrial complex (AIC) lead to sectoral mobility (relocation), the transformation of rural social structure, and the development of informal sector where one third of the employed are rural residents. However, despite the informal sector being characterized by a primitive level of technology, low capital-intensity, as well as low levels of human capital, it compensates for the expenses of Russian village social development by way of absorbing labor resources. Had they ended up outside of this sector, might have stayed out of business.
One of the main trends in the development of the financial sector around the world is digitalization. The purpose of this study is to analyze the interdependence between the level of digitalization ...and the key performance indicators of commercial banks, as well as the prospects for further development of digital technologies and their implementation in the activities of commercial banks. Based on the analysis of statistical data, it was confirmed that the digitalization of the Russian banking sector has significant potential. A correlation analysis of the data of 100 Russian commercial banks for 2021, grouped by assets, was performed. The presence of the influence of the level of digitalization on the individuals' transactions and on the net commission income was confirmed. Hypotheses about the existence of a close relationship between the level of digitalization and the volume of transactions with legal entities, as well as profitability, have not been confirmed. According to the results of the study, it was noted that digitalization currently has the greatest impact on large Russian banks. It was concluded that currently, for the largest and big banks, a high level of digital maturity is a competitive advantage. This research contributes to the development of the theory of modern banking. The results obtained will be useful for researchers of the impact of digitalization on various aspects of banks' activities, for banks, and for public authorities.
APPLICATION OF LOGICAL RULES IN DECISION-MAKING PROCESSES Tussupov, D.A.; Mukhanova, A.A.
Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ Fiziko-matematičeskaâ/Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ fiziko-matematičeskaâ,
12/2021, Letnik:
6, Številka:
340
Journal Article
The scheelite-like double tungstate Na5YW4O16 was selected by using Voronoi tessellation as a compound with suitable channels for ionic transport. The effect of charge carrier density on the ionic ...conductivity was investigated by heterovalent substitution of Ca2+ for Na+ and Y3+. Ionic conductivities of ceramics at 300°С are 3.4·10−5S/m for Na5YW4O16 and 8.5·10−6S/m for Na4.6Ca0.2YW4O16. It is proposed to use new term “pathway density” to explain low value of ionic conductivity for the studied compound.
•Conductivity pathways for series of the Na-containing oxide's structures were studied.•Ionic conductivity of Na5YW4O16 and Na4.6Ca0.2YW4O16 was measured.•Complex term “pathway density” was used to complete Voronoi tessellation method.
The search for effective reagents for the flotation of non-ferrous metals from mineral raw materials is an actual problem. The article discusses the results of research on improving the technology of ...processing copper–molybdenum ores using a combined collector emulsion. The object of research was copper–molybdenum ore containing 0.43% copper and 0.0089% molybdenum. Copper minerals are represented by chalcopyrite 1.2% and chalcocite 0.015%, while covellite is present in a much smaller amount. The main mineral of molybdenum is molybdenite. The cycle of collective copper–molybdenum flotation includes the main flotation, control flotation, and three re-cleanings of concentrate. In the basic mode, the collective Cu–Mo concentrate was produced with the copper content of 16.25% with an extraction of 77.79% and with the molybdenum content of 0.45% with an extraction of 79.38%. Reaflot, thionocarbamate, and butyl xanthate were used in a ratio of 1:3:15 to prepare a combined collector agent. In order to produce the combined collector emulsion, the best degree of dispersion, which amounted to 99.5% of particles with a size of −3.6 μm, was chosen. During the Cu–Mo ore flotation using an optimally dispersed microemulsion of the combined collector agent, a collective Cu–Mo concentrate was obtained with a copper content of 18.2% with an extraction of 83.58%, and with a molybdenum content of 0.49% with an extraction of 88.46%. The use of a combined collector agent increases the extraction of copper into the collective Cu–Mo concentrate by 5.79%, while the extraction of molybdenum increases by 9.08%.
The design of water‐stable photo and electrocatalysts of metal–organic frameworks (MOFs) for its promising catalytic applications at long‐term irradiations or persisted current loads is extremely ...necessary but still remains as challenging. A limited number of reports on Ti‐MOF‐based catalysts for water splitting are only available to explain and understand the correlation between the nature of materials and MOFs array. Herein, spherical Ti‐MOFs and corresponding partially annealed hollow core–shell Ti‐MOFs (Ti‐MOF/D) are designed and the correlation with their photo(electro)catalytic water splitting performance is evaluated. The switchable valence state of Ti for the Ti‐MOF as a function of molecular bonding is the possible reason behind the observed photocatalytic hydrogen generation and light‐harvesting ability of the system. Besides, the defect state, solid core–shell mesoporous structure, and active sites of Ti‐MOF help to trap the charge carriers and the reduction of the recombination process. This phenomenon is absent for hollow core–shells Ti‐MOF/D spheres due to the rigid TiO2 outer surface although there is a contradiction in surface area with Ti‐MOF. Considering the diversity of Ti‐MOF and Ti‐MOF/D, further novel research can be designed using this way to manipulate their properties as per the requirements.
A controllable strategy is reported for the preparation of spherical Ti‐MOFs (metal–organic frameworks) and corresponding hollow core–shell structure and evaluated their photo(electro)catalytic water splitting performance. The switchable valence state of Ti for the Ti‐MOF as a function of molecular bonding is the reason behind the observed high photocatalytic hydrogen generation and light‐harvesting ability of the system.
The flotation of copper-molybdenum ores Aktogay deposit of Republic Kazakhstan has been studied, with application new synthesized modified reagents. Selective flotation of copper-molybdenum ...collective concentrate was carried out according to standard technology with application of modified flotation agent (diesel fuel: oil = 1:1) in comparison with traditional apolar (kerosene) collector. The use of the modified reagent in the processing of copper- molybdenum ore allows increasing the molybdenum content in the molybdenum concentrate by 3,6, and extraction - by 5,7 %.
Environmental monitoring using satellite imagery and aerial photography is an important tool for assessing the state of the environment at the global and regional level. The article discusses the ...process of developing an application for environmental monitoring based on the analysis of high-altitude photographs. The authors describe in detail the choice of data processing methods and technologies underlying the developed application. An analysis of algorithms for detecting and analyzing environmental changes using high-precision satellite data was carried out. The application provides users with access to real-time visualization of environmental parameters, facilitating effective monitoring and management of natural resources. The results demonstrate the potential of using modern technologies in the field of ecology and highlight the importance of developing relevant tools for sustainable environmental management.
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