Mechanical and electrical properties of composite materials based on polyester rezins and gipsymfiber

The composite materials developed from unsaturated polyester resins and gypsumfiber filler show relatively good strength characteristics. The adding gypsumfiber does not effect negatively the properties of the unsaturated polyester resins. The materials obtained have good electrical-insulation characteristics.Рассмотрены композиционные материалы на основе полиестерных резин и гипсфибер. Исследованы механические и электрические свойства в зависимости от содержания гипсфибра

NONLINEAR PROPERTIES OF BARIUM TITANATE CERAMICS

The materials based on barium titanate have nonlinear dependence of polarization on the intensity of the electrical field. The properties of those materials are used when different automation elements such as primary converters, phase regulators for low and high frequencies, sensors, modulators etc. are derived. Ceramics based on barium titanate (BaTiO3) alloyed with H3BO3 and Bi2O3 have been derived and researched. The influence of the temperature of sintering on the values of the dielectric permittivity on the structural properties has been determined. The influence of the quantity of the added material on the temperature dependencies and the non-linear properties of the ceramics have been analyzed. Both legation additives decrease the sintering temperature. However, the values of the dielectric permittivity decrease while the non-linear properties of the doped barium titanate (BaTiO3) improve. The coefficient of non-linearity reaches its maximum for the H3BO3 composites, synthesized at temperature of 1100 oC

NONLINEAR PROPERTIES OF BARIUM TITANATE CERAMICS

The materials based on barium titanate have nonlinear dependence of polarization on the intensity of the electrical field. The properties of those materials are used when different automation elements such as primary converters, phase regulators for low and high frequencies, sensors, modulators etc. are derived. Ceramics based on barium titanate (BaTiO3) alloyed with H3BO3 and Bi2O3 have been derived and researched. The influence of the temperature of sintering on the values of the dielectric permittivity on the structural properties has been determined. The influence of the quantity of the added material on the temperature dependencies and the non-linear properties of the ceramics have been analyzed. Both legation additives decrease the sintering temperature. However, the values of the dielectric permittivity decrease while the non-linear properties of the doped barium titanate (BaTiO3) improve. The coefficient of non-linearity reaches its maximum for the H3BO3 composites, synthesized at temperature of 1100 oC

Application network programming method – knapsack problem and it’s modification

New method of multi-extremal optimization has been developed - a network programming method, which is based on the possibility to represent a complex function as a superposition of simpler functions. The paper deals with network (dichotomous) programming method and its application for solving multi-extremal and discrete optimization problems in Project Management. The main goal of the paper is to develop a new approach to solving knapsack problem and to solve a number of optimization problems of project building management. The optimal structure of the dichotomous representation is determined. On the basis dichotomous programming method new algorithm to solve a optimization problem is propose

Value-meaningful conceptualisation of educational material in the process of foreign language teaching at the university: A hermeneutic approach

Introduction. One of the main tasks of teaching foreign languages for professional purposes is the formation of professional communicative competence of students. In this regard, it is important for university teachers to create conditions for students to master the methods and techniques of productive communication, not only from the perspective of language and culture, but also their future profession. In addition to the logical and rational aspect, it is important for pedagogical students to focus on the value and semantic significance of educational information, to deeply understand rather than to memorise information, to be emotionally “engaged” into knowledge, filling it with personal meaning, in order to avoid formal mastering of pedagogical profession. This is possible in the context of the value and semantic conceptualisation of acquired knowledge, which is carried out in the process of interpreting and structuring the content of training by the principle of linguistic concept. Aim. The present research aims to substantiate the content, methods, techniques and forms of value meaningful conceptualisation of educational material in the process of teaching foreign languages to pedagogical students. Methodology and research methods are based on the study of the value-semantic foundations of pedagogical practice with reference to the cultural-historical concept; on the phenomenological-hermeneutical approach, aimed at the actualisation of the interpretive potential of the teaching content; on the utilisation of the methods of theoretical analysis and synthesis, deduction and induction, comparison, modelling, and methods of inclusive observation. The empirical study was conducted during one academic year (from September 2020 to June 2021) in the course “English for Specific Purposes (ESP)” with 60 students of Pedagogical Education major of the University of Tyumen. To assess the results of the experimental work the following tools were used: L. Michelson’s test, free associative experiment, the method of expert evaluation based on the level scale developed by the authors. Results. The obtained data confirmed the effectiveness of structuring learning content according to the linguistic concept image. In the course of the final test of communicative and professional skills, most students demonstrated a confident command of the basics of professional communication in English. Compared to the initial stage of the study, students’ professional communication in English became more productive. Students’ statements were distinguished by their meaningfulness, structure. They used additional material from other fields of knowledge, emotional and value coloring in the form of metaphors, idioms, statements of famous teachers, precedent texts, the ability to improvise, etc. Scientific novelty. The authors didactically proved the productivity of the hermeneutic approach in the design of teaching foreign languages on the basis of structuring teaching material by the principle of linguistic concept, which is a mediating link between the scientific concept, on the one hand, and the individual consciousness and the subjective personal experience of students, on the other hand. Practical significance. The results of this study can be used by teachers in order to achieve a balance between technological and axiological aspects of learning and cognitive activities of students for mastering their pedagogical knowledge, professional and personal experience, which will ultimately contribute to the enhancement of professional training of future educators.Введение. Одной из основных задач преподавания иностранных языков для профессиональных целей является формирование профессиональной коммуникативной компетенции студентов. В этой связи в процессе обучения преподавателям вуза важно создать условия для освоения студентами способов и приемов осуществления продуктивного общения не только с позиции языка и культуры, но и их будущей профессии. Во избежание формального освоения педагогической профессии студентам педагогических специальностей важно, помимо логико-гносеологического аспекта, ориентироваться на ценностно-смысловую значимость учебной информации, глубоко понимать, а не запоминать, эмоционально «проживать» знание, наполняя его личностными смыслами. Это возможно в условиях ценностно-смысловой концептуализации осваиваемого знания, осуществляемой в процессе интерпретации и структурирования содержания обучения по образу лингвоконцепта. Цель – обоснование содержания, методов, приемов и форм ценностно-смысловой концептуализации учебного материала в процессе обучения иностранным языкам студентов педагогических специальностей. Методология, методы и методика. В основу работы положены исследование ценностно-смысловых оснований педагогической деятельности с обращением к культурно-исторической концепции, а также феноменолого-герменевтический подход, направленный на актуализацию интерпретационного потенциала содержания обучения. Использованы методы теоретического анализа и синтеза, дедукции и индукции, сравнения, моделирования, включённого наблюдения. Эмпирическое исследование проводилось в течение одного академического года (с сентября 2020 года по июнь 2021 года) на занятиях по «Иностранному языку в профессиональной сфере (английский язык)» с участием 60 студентов, обучающихся на направлении «Педагогическое образование» Тюменского государственного университета. Для оценки результатов опытной работы использовались: тест Л. Михельсона, свободный ассоциативный эксперимент, метод экспертной оценки на основе разработанной авторами уровневой шкалы. Результаты. Полученные в результате исследования данные подтвердили эффективность структурирования содержания обучения по образу лингвоконцепта. В ходе итогового тестирования коммуникативных и профессиональных умений и навыков большинство студентов продемонстрировали уверенное владение основами профессиональной коммуникации на английском языке. По сравнению с начальным этапом исследования профессиональная коммуникация студентов на английском языке стала более продуктивной. Высказывания отличались осмысленностью, структурированностью, привлечением дополнительного материала из других областей знания, эмоционально-ценностной окрашенностью в виде метафор, идиом, высказываний известных педагогов, прецедентных текстов, умением осуществлять импровизацию и др. Научная новизна. Дидактически обоснована продуктивность герменевтического подхода в проектировании обучения иностранным языкам на основе структурирования учебного материала по принципу лингвоконцепта, который является опосредующим звеном между научным понятием, с одной стороны, и индивидуальным сознанием и субъективно-личностным опытом обучающихся, с другой.Авторы выражают благодарность рецензентам за экспертное мнение и конструктивный подход.The authors express their gratitude to the reviewers for their expert opinion and constructive approach

Features of the course of manifest forms of acute hepatitis C

Aim. To identify clinical, epidemiological and laboratory-instrumental features of acute hepatitis C at the present stage according to the infectious hospital data. Methods. The study included 111 patients with acute hepatitis C aged from 18 to 79 years who were hospitalized in Republican Clinical Infectious Diseases Hospital named after A.F. Agafonov in 2011 - I quarter of 2017. Acute hepatitis C was diagnosed in accordance with the guidelines of the Ministry of Health of the Russian Federation. Results. In the study group, females aged 21 to 40 years, non-working, predominantly living in Kazan with medical transmission of infection (34 %) prevailed. The disease was mild and moderately severe (71 %). The icteric form was observed in 94 % of patients, in 3.6 % - with a cholestatic component. When comparing laboratory parameters, markers of cytolysis and cholestasis differed significantly in patients depending on the severity (p<0.001). Changes in the gallbladder walls (an ultrasound marker of cholestasis) were revealed in 21.4 % of patients. On specific examination, the viral RNA was detected in 100 % of patients. Analysis of serological markers revealed predominance of antibodies to core and NS3 proteins, M class antibodies were detected only in half of the patients. Specific antibodies were absent (“dark diagnostic window”) in 3 % of patients with mild and 6 % of moderate form of the disease. Conclusion. The feature of the course of acute viral hepatitis C was the predominance of moderate forms (71 %) with medical transmission of infection. Icteric forms of acute viral hepatitis C were diagnosed in 94 % of patients (in 3.6 % cases with the development of cholestatic component). PCR is a mandatory method of specific diagnosis of acute viral hepatitis C, and in case of a “dark diagnostic window” becomes the leading method