Manufacture of Two-layers and Double-sided Iron Castings with Differential Structure and Properties

The paper proposes a new method of production of bilayer and double-sided castings with differentiated structure and properties using the technology of in-mold modification of the initial melt, smelted in a single melting furnace, which ensures formation of hard wear-resistant white iron as the working layer, and formation of ductile shock-resistant cast iron with nodular graphite as the core or the mounting part. Numerous laboratory studies confirm the feasibility of the proposed method and provide conditions ensuring differentiation of structure and properties in local parts or layers of castings. The prospects of the method for manufacturing a wide range of industrial castings are indicated

The Landau-Lifshitz-Bloch equation for ferrimagnetic materials

We derive the Landau-Lifshitz-Bloch (LLB) equation for a two-component magnetic system valid up to the Curie temperature. As an example, we consider disordered GdFeCo ferrimagnet where the ultrafast optically induced magnetization switching under the action of heat alone has been recently reported. The two-component LLB equation contains the longitudinal relaxation terms responding to the exchange fields from the proper and the neighboring sublattices. We show that the sign of the longitudinal relaxation rate at high temperatures can change depending on the dynamical magnetization value and a dynamical polarisation of one material by another can occur. We discuss the differences between the LLB and the Baryakhtar equation, recently used to explain the ultrafast switching in ferrimagnets. The two-component LLB equation forms basis for the largescale micromagnetic modeling of nanostructures at high temperatures and ultrashort timescales

Лікування післяпункційного головного болю

Післяпункційний головний біль може ускладнитись порушеннями слуху чи зору, внутрішньочерепною субдуральною чи інтрацеребральною гематомою, ущемленням головного мозку і смертю. Тому кожен випадок післяпункційного головного болю потребує серйозного ставлення. Сучасні неінвазивні способи лікування післяпункційного головного болю: ліжковий режим, рідини, кофеїн, суматриптан, – малоефективні. Хірургічне закриття розриву твердої оболони є методом останньої надії. Епідуральне пломбування кров’ю лишається інвазивним методом вибору, з приблизно 70 % тривалого успіху після першої ін’єкції. Старовинна внутрішньовенна акватерапія є менш інвазивною і доволі популярною серед українських акушерських анестезіологів. Блокада крило-піднебінного вузла є найменш інвазивним методом, що потребує дослідження

Cases in methods of teaching Russian as a foreign language

The article deals with the specificity of using cases in teaching Russian as a foreign language (RFL) to the adults getting higher professional education or studying Russian for personal goals. The research describes operational phases in the educational process of cases and presents the innovative three-component model of the case. The model is based on features of teaching Russian as a foreign language and takes into account the level of the language proficiency, peculiarities of students and learning environment. The authors define greatest challenges and positive aspects of using cases and lay down their efficiency conditions. The structure of the case developed and proposed in the article can be used in teaching any European language (with some modifications connected with features of culture and everyday life of this or that country). Efficiency of the method, proposed in the article, has been tested at Omsk Tank-Automotive Engineering Institute in the groups with the student number not exceeding 10 persons. The article formulates general methodical requirements and conditions enhancing the productivity of teaching Russian as a foreign language while using cases, positive and negative aspects of cases in methods of teaching Russian as a foreign language