Stability and reproducibility of solid electrolyte amperometry sensors at the analysis of hydrogen in nitrogen-containing gas mixtures

This paper illustrates the results of long-term tests on the stability of the output signal of the solid electrolyte amperometry sensor when measuring the hydrogen concentration in the H2 + N2 gaseous mixture. The obtained experimental data verify the stability and reproducibility of the sensor output signal for hydrogen concentration measurements in the nitrogen-containing gaseous mixture during  8000 h of operation. The output signal drift, i.e., the limiting current value, was insignificant, less than ± 5 %. The sensor operation was performed at 3 temperature shifts with different time intervals; these changes did not have any impact either on the sensor integrity or on its operation. The structure of the solid electrolyte sensor, intermediate solid electrolyte / electrode layer and electrodes did not undergo any significant changes during operation. The dynamic characteristics of the sensor, the response time in particular, remained stable during the operation.https://doi.org/10.15826/elmattech.2024.3.02

Legal nature, contents, and problems of applying a corporate agreement

A corporate agreement is widely known as a legal structure that allows regulating legal relations and distributing risks between participants in an investment transaction. The establishment of this institution in Russian legislation has opened up great opportunities for both financial and strategic investors. When concluding a corporate agreement with third parties, a “quasi-corporate” agreement is concluded. Study objective: legal research of the current legislation and theoretical concepts regarding the definition of the legal nature, content, and problems of applying a corporate agreement and identification of the most significant proposals for legislation improvement. Methods. The authors of the study applied general scientific and specific scientific methods of research work. In particular, the dialectical method of scientific knowledge, systemic, functional, deduction, induction, analysis, synthesis methods as well as special legal ones like formal legal, comparative-legal, the method of legal modeling, and others were implemented. Results and novelty. The analysis of law enforcement practice showed that, despite a wide selection of both named and unnamed protection measures, none of them guarantee the proper performance of obligations arising from a corporate agreement. This thesis follows from the materials of judicial and arbitration practice

Lectin-like bacteriocins from pseudomonas spp. utilise D-rhamnose containing lipopolysaccharide as a cellular receptor

Lectin-like bacteriocins consist of tandem monocot mannose-binding domains and display a genus-specific killing activity. Here we show that pyocin L1, a novel member of this family from Pseudomonas aeruginosa, targets susceptible strains of this species through recognition of the common polysaccharide antigen (CPA) of P. aeruginosa lipopolysaccharide that is predominantly a homopolymer of d-rhamnose. Structural and biophysical analyses show that recognition of CPA occurs through the C-terminal carbohydrate-binding domain of pyocin L1 and that this interaction is a prerequisite for bactericidal activity. Further to this, we show that the previously described lectin-like bacteriocin putidacin L1 shows a similar carbohydrate-binding specificity, indicating that oligosaccharides containing d-rhamnose and not d-mannose, as was previously thought, are the physiologically relevant ligands for this group of bacteriocins. The widespread inclusion of d-rhamnose in the lipopolysaccharide of members of the genus Pseudomonas explains the unusual genus-specific activity of the lectin-like bacteriocins

Human capital of the Karelian Arctic in the implementation of the special economic regime of the region

This article presents the results of a field study of the state and development of the human capital in the Karelian Arctic as a factor in sustainable development of the region during the transition to a new economic and legal regime. The focus of the scientific research is the assessment by the citizens of the level of their well-being and the ability to meet various family needs, personal income planning possibilities, correspondence of the current place of work to the training received in an educational institution. Brief conclusions are made on the indicated aspects of the development of the human capital in the Karelian Arctic region. Data were obtained and an analysis of the situation was made both for the Karelian Arctic as a whole, and for individual municipal districts included in this region. Further research activities to deepen scientific knowledge about the state and trends in the development of the human capital in Arctic Karelia and the Arctic zone of Russia as a whole have been identified. The issues under study are one of the key ones in determining the parameters of the created special economic and legal regime, which applies to Arctic Karelia

Methodological approaches to the study of socio-economic constraints on sustainable development of the Karelian Arctic region in modern conditions

The article examines the tools of sociological research, used in the study of the state and prospects of the socio-economic and environmental development of the Karelian Arctic region, its human capital, as a factor in the sustainable development of the region. Special attention is paid to the reasons for choosing migration from the region of residence as a form of investment in the human capital, as well as the role of a wide range of factors in deciding on migration, such as environmental, economic and social ones. The tasks of a comprehensive study of the processes of regional socio-economic and ecological development are considered, the methodological approaches used at each stage of this study are determined, the importance of sociological tools in the system of goals and objectives of this study is identified. The process of forming a special economic and legal regime of the Arctic Zone of the Russian Federation as a whole and the Karelian Arctic region requires taking into account not only the entire spectrum of the latest problems of these territories, but also updating the knowledge about the features of their socio-economic and ecological economic development. These circumstances require the improvement of research tools used in the study of these processes

Experimental studies into the performance of the lead coolant axial pump wet ends to justify main circulation pumps for the HMLC reactor plant circuits

The paper presents the results of the studies to justify the design solutions for the main circulation pumps of the heavy liquid-metal cooled reactor plant circuits. A substantial difference has been shown in the performance of pumps for the heavy liquid-metal coolant transfer. The studies have confirmed the qualitative difference in the cavitation performance of coolants, the state of the gases and vapors they contain, the influence of supply and discharge devices, and the effects of the impeller blade section performance and geometry and the hub-tip ratio on the pump performance. The studies were performed based on NNSTU’s lead-cooled test facilities with the coolant temperature in a range of 440 to 550 °C and the coolant flow rate of up to 2000 t/h. The outer diameter of the impellers and the straightening devices was about 200 mm, and the thickness of the flat 08Kh18N10T-steel blades was 4.0 mm and that of the airfoil blades was up to 6.0 mm. The pump shaft speed changed in a stepped manner from 600 rpm to 1100 rpm after each 100 rpm. The studies were conducted to justify the engineering and design solutions for pumps as applied to conditions of small and medium plants with fast neutron lead cooled reactors currently under investigation at NNSTU (BRS-GPG). The experimental results can be recommended for use to design other HLMC transfer pumps

Legal nature, contents, and problems of applying a corporate agreement

A corporate agreement is widely known as a legal structure that allows regulating legal relations and distributing risks between participants in an investment transaction. The establishment of this institution in Russian legislation has opened up great opportunities for both financial and strategic investors. When concluding a corporate agreement with third parties, a “quasi-corporate” agreement is concluded. Study objective: legal research of the current legislation and theoretical concepts regarding the definition of the legal nature, content, and problems of applying a corporate agreement and identification of the most significant proposals for legislation improvement. Methods. The authors of the study applied general scientific and specific scientific methods of research work. In particular, the dialectical method of scientific knowledge, systemic, functional, deduction, induction, analysis, synthesis methods as well as special legal ones like formal legal, comparative-legal, the method of legal modeling, and others were implemented. Results and novelty. The analysis of law enforcement practice showed that, despite a wide selection of both named and unnamed protection measures, none of them guarantee the proper performance of obligations arising from a corporate agreement. This thesis follows from the materials of judicial and arbitration practice

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Li-rich Mn-based layered oxides are among the most promising cathode materials for next-generation lithium-ion batteries, yet they suffer from capacity fading and voltage decay during cycling. The electrochemical performance of the material can be improved by doping with Mg. However, the effect of Mg doping at different positions (lithium or transition metals) remains unclear. Li1.2Mn0.54Ni0.13Co0.13O2 (LR) was synthesized by coprecipitation followed by a solid-state reaction. The coprecipitation stage was used to introduce Mg in TM layers (sample LR-Mg), and the solid-state reaction (st) was used to dope Mg in Li layers (LR-Mg(st)). The presence of magnesium at different positions was confirmed by XRD, XPS, and electrochemical studies. The investigations have shown that the introduction of Mg in TM layers is preferable in terms of the electrochemical performance. The sample doped with Mg at the TM positions shows better cyclability and higher discharge capacity than the undoped sample. The poor electrochemical properties of the sample doped with Mg at Li positions are due to the kinetic hindrance of oxidation of the manganese-containing species formed after activation of the Li2MnO3 component of the composite oxide. The oxide LR-Mg(st) demonstrates the lowest lithium-ion diffusion coefficient and the greatest polarization resistance compared to LR and LR-Mg

Numerical Study of the Application of Polymeric Solutions Based on Ethylene Glycol-Water Mixture for Permafrost Drilling

Разработана математическая модель сопряженного теплообмена скважины с учетом фазовых переходов и циркуляции бурового раствора в процессе бурения. Проведены расчетные исследования процесса растепления многолетнемерзлой породы вокруг скважины в процессе ее бурения растворами с различным содержанием этиленгликоля. Установлены основные закономерности сопряженных теплогидравлических процессов при бурении многолетнемерзлой породы с учетом циркуляции раствора и растепления. Показано, что добавка этиленгликоля приводит к снижению коэффициента теплоотдачи и количества тепла, поступающего в скважину, что в свою очередь ведет к значительному замедлению скорости процесса растепления многолетнемерзлых породA mathematical model of the conjugate heat transfer of the well was developed subject to phase transitions and drilling fluid circulation during the drilling. Calculations were carried out for the permafrost thaw process around a well while drilling using by solutions with different ethylene glycol contents. It was established the main regularities of conjugate thermohydraulic processes during the drilling of permafrost subject to thawing and solution circulation. It was shown the addition of ethylene glycol leads to a decrease of the heat transfer coefficient and the quantity of heat entering the well, which in turn leads to a significant slowdown in the thawing permafrost proces