The number of data centers worldwide is increasing year by year, mostly because of the development of cloud services and applications. In the near future, the rate of construction of data centers will grow, with a corresponding increase in their electrical energy consumption. The requirements of the reliability of the electrical power supply of data centers are one of the highest among industrial power consumers, since uninterrupted power supply is critically important for the continuous functioning of server hardware. The assessment of electrical power supply reliability is one of the most important parts of the design process of data centers. However, the speed of the development of new power equipment does not always make it possible to use classical probabilistic and statistical methods for reliability assessment. Therefore, the development of new methods for reliability assessment based on alternative approaches, which can eliminate the disadvantages of probabilistic and statistical methods, are of great interest. This paper discusses the alternative method for analyzing the reliability of electrical power supply for the case of data centers. The method defines the reliability through the internal information of the system that characterizes the system’s topology, flows of information, energy, and matter in the system.

Аннотация: В настоящее время проектирование электротехнического комплекса выемочных участков выполняется по устаревшим нормативным документам, сформированным в начале 90-х годов ХХ века. Это замедляет реализацию концепции «цифрового горного предприятия» и не позволяет полностью реализовать потенциал к энергосбережению. В то же время развитие цифровых технологий делает актуальным вопросы имитационного компьютерного моделирования электротехнического комплекса выемочных участков угольных шахт. Имитационное компьютерное моделирование необ ходимо для разработки мероприятий по повышению эффективности электротехнического комплекса существующих угольных шахт, а также при проектировании новых угольных шахт. В статье предложена методология формирования имитационных компьютерных моделей для оценк и энергоэффективности системы электроснабжения выемочного участка угольной шахты. Для обеспечения корректности формирования профилей потребления активной и реактивных мощностей предложено использование сценарного подхода к моделированию динамических процес сов. В качестве примера использования предложенного подхода рассмотрен один из сценариев работы электротехнического комплекса выемочного участка одной из угольных шахт Кузбасса.

The article discusses the higher educational institutions transition problems to a distance learning operation mode during the pandemic, taking into account the technical universities work specifics. The article describes the problems that have arisen as a result of e-learning mode transition, as well as some solutions to these problems. The article focuses on: the teachers’ readiness problems; the e-courses quality for technical specialities students; the teachers’ developed materials copyright; virtual learning environments to replace the laboratory stands and equipment for students in distance learning process; distance learning educational process implementation technical support problems. The described problems’ proposed solutions’ implementation can be carried out in higher educational institutions without hiring additional personnel.

Recent experimental results on the electrical and electrochemical properties of carbon-carbon electrodes of electrochemical capacitors (supercapacitors) are discussed. The dependence of electronic conductivity, specific capacity and the equivalent series resistance on the concentration and nature of the conductive filler is revealed: carbon black PA-76, carbon fibers VGCF grown in vacuum. It is established that the capacity of the electrical double layer formed on the high extended surface area of carbon-carbon electrode material of electrochemical capacitor obtain a maximum value of 115 F / g at a concentration of conductive filler 15%. The equivalent series resistance does not depend on the concentration and nature of the conductive filler and electrical contact is defined on the boundary of the electrode material / current collector.