The influence of bioethanol content and parameters of the cavitation field on the quality indicators of motor gasolines: volatility and octane number is studied. Studying the effect of bioethanol and cavitation treatment of bioethanol-gasoline mixture will make it possible to produce automotive fuels for different climatic zones, or winter (summer) versions of gasolines. The use of bioethanol and cavitation treatment of a bioethanol-gasoline mixture affect the fractional composition of motor gasoline and its volatility. The optimal content of the biocomponent, at which there is an increase in the volatility of gasoline, is established Also the results of the octane number change are presented depending on the intensity of cavitation treatment for gas condensate with the addition of bioethanol. The influence of bioethanol content on the increase in octane number during cavitation treatment is determined. It is found that the introduction of bioethanol into the composition of gasoline leads to an improvement in its volatility. In this case, cavitation treatment makes it possible to obtain a mixture resistant to delamination. The addition of bioethanol leads to an adequate increase in light fractions during mechanical mixing and to a change in the fractional composition of the bioethanol-gasoline mixture during cavitation treatment. The addition of bioethanol in amounts up to 10% leads to a decrease in the saturated vapor pressure during cavitation treatment of bioethanol-gasoline mixtures, and an increase in the bioethanol content up to 20% leads to an increase in the saturated vapor pressure, which is explained by a change in the chemical composition of fuel components in comparison with the mechanical method of preparing mixtures. By cavitation treatment it is possible to change the fractional composition, the pressure of saturated vapors and the volatility of bioethanol-gasoline mixtures, making cavitation a promising energy-saving process for the production of gasoline for various climatic conditions

No abstract

A new wave of relocation of universities from the war zone has resulted from the negative consequences of the hostilities and the temporary occupation of the territories of Ukraine by the russian federation. The challenges of today have a multidirectional impact, especially on universities that have been displaced twice. The relocation of each university is a unique experience, and academic management is the object of modern scientific research. Therefore, the paper aims to highlight the experience of gaining resilience and developing the sustainability of Volodymyr Dahl East Ukrainian National University (hereinafter V. Dahl EUNU) during the evacuation in 2014 from the city of Luhansk to the town of Severodonetsk, and in 2022 along the entire movement path to the city of Kyiv. It is determined that the main resources are human and social capital, which allow not only counteractong the challenges of martial law, but also ensuring the restoration of the system and its further development. The introduction of digitalization of the educational process, and work on the development of values and reputation are identified as the main tools for survival in dangerous war conditions. According to the results of the study, it was proved that in the conditions of martial law, the university acquired new qualities and developed the capacity for resilience. The ability of V. Dahl EUNU to use its strengths to overcome dangers and obstacles and to choose strong strategies focused on recovery and development was considered.

The object of this study is an effective approach to designing automatic control systems with a model of complex technological processes, which include interrelated and complementary stages from the formulation of the task to the implementation of the control system at the facility. It includes a set of measures, starting with the analysis of the process in its hardware design with the construction of an information and logical scheme to the development of all types of security and commissioning. The main problem in the implementation of a control system with a technological process model is the limited ranges of adequacy of mathematical models. Therefore, when changing the load on the unit, changing external and internal perturbations, it is necessary to constantly ensure the necessary level of adequacy of the models. It is proposed to use a combined model as a mathematical model of the control object, combining the advantages of analytical and experimental-statistical models. This makes it possible to significantly expand the information base of the resulting model. A simple and effective iterative algorithm for calculating this model is also proposed. It includes sequential steps to determine the parameters of the model by basic dependences (the deterministic part of the model), followed by clarifying them according to the current data from the object (experimental statistical part of the model). The effectiveness of the approach is confirmed by the example of ASC TP of the ammonia synthesis column. By improving the accuracy of determining the control parameters and narrowing the range of their change around the optimal value, the volume of ammonia release increases by 5–8 %. The application of the described approach on the example of the development of an automatic control system for the technological process of ammonia synthesis confirmed the economic feasibility of implementing the proposed solutions

Власенко Виктория Ивановна, кандидат технических наук, доцент, кафедра технологии и конструирования швейных изделий, Киевский национальный университет технологий и дизайна, Украина.