Проектирование системы электроснабжения производственной базы по обслуживанию нефтяной промышленности

В выпускной работе рассматривается система электроснабжения производственной базы по обслуживанию нефтяной промышленности. Объектом исследования является прокатно-ремонтный цех производственной базы по обслуживанию нефтяной промышленности. Цель работы: Разработка системы электроснабжения производственной базы по обслуживанию нефтяной промышленности и развитие способности решать технико-экономические вопросы при проектировании систем электроснабжения. В процессе исследования проводились расчеты электрических нагрузок прокатно-ремонтного цеха и предприятия в целом, методами коэффициента расчетной активной мощности и коэффициента спроса соответственно. Произведен выбор низковольтного оборудования прокатно-ремонтного цеха и высоковольтного оборудования главной понизительной подстанции.In the graduate qualification work, the system of power supplying production base for servicing the oil industry is considered. The object of the study is a hire and repair shop of the production base for servicing the oil industry. Purpose of work: development power supplying system production base for servicing the oil industry and development of the ability to solve technical and economic issues in the design of power supplying systems. In the process of the study, calculations were made of the electrical loads of the hire and repair shop and the enterprise as a whole, using the methods of the active power factor and the demand factor, respectively. A choice of low-voltage equipment of the hire and repair shop and high-voltage equipment of the main step-down substation were made

Magnetic two-dimensional systems

Two-dimensional (2D) systems have considerably strengthened their position as one of the premier candidates to become the key material for the proposed spintronics technology, in which computational logic, communications and information storage are all processed by the electron spin. In this article, some of the most representative 2D materials including ferromagnetic metals (FMs) and diluted magnetic semiconductor (DMSs) in their thin film form, magnetic topological insulators (TIs), magnetic graphene and magnetic transition metal dichalcogenides (TMDs) are reviewed for their recent research progresses. FM thin films have spontaneous magnetization and usually high Curie temperature (Tc), though this can be strongly altered when bonded with semiconductors (SCs). DMS and magnetic TIs have the advantage of easy integration with the existing SC-based technologies, but less robust magnetism. Magnetic ordering in graphene and TMDs are even more fragile and limited to cryogenic temperatures so far, but they are particularly interesting topics due to the desired long spin lifetime as well as the outstanding mechanical and optical properties of these materials

Tailoring perpendicular magnetic coupling by XMCD

The elemental perpendicular magnetic anisotropy constants of both elements of a 20 nm bcc Co88Mn12 alloy film grown on MgO(001) and capped with Al, have been determined. By fitting a Stoner-Wohlfarth astroid model to the measured Co and Mn L3 XMCD peak intensities as a function of incidence photon angle with the magnetic field applied co-axially with the photon propagation direction, the elemental perpendicular anisotropy constants were found to be -6.46 x 105 J/m3 and -6.68 x 105 J/m3, respectively. The modeling of the Co and Mn data both result in nearly the same anisotropy constant as expected for a single alloy film

Large moments in bcc FexCoyMnz ternary alloy thin films

The elemental magnetic moments and the average atomic moment of 10-20 nm thick single crystal bcc (bct) FexCoyMnz films deposited on MgO(001) have been determined as a function of a broad range of compositions. Thin film epitaxy stabilized the bcc structure for 80% of the available ternary compositional space compared to only a 23% stability region for the bulk. The films that display ferromagnetism represent 60% of the available compositional possibilities compared to 25% for the bulk. A maximum average atomic moment of 3.25 ± 0.3 μB/atom was observed for a bcc Fe9Co62Mn29 film (well above the limit of the Slater-Pauling binary alloy curve of 2.45 μB/atom). The FexCoyMnz ternary alloys that exhibit high moments can only be synthesized as ultrathin films since the bcc structure is not stable in the bulk for those compositions