Use of E-resources of the learning environment in teaching mathematics to future engineers

© 2016 by author/s.The urgency of the issue discussed in this article is determined by fact that the modern education model aims at forming a competitive and creative personality of a student striving for continuous self-improvement and self-development. It should be emphasized that mathematical training is an integral part of engineering education. In this regard, the article aims to dwell upon the use of electronic resources of the learning environment in teaching mathematics to future engineers. The leading research method is the student-activity approach which allows to describe the issue in terms of dialogueness, subjectivity and individuality. The article describes the following resources of e-learning environment: motivational-adaptive, subjective, integrative, and managerial. The article reveals pedagogical opportunities of e-learning environment in teaching mathematics to future engineers. The use of electronic media in teaching future engineers at universities is proved to be successful. The materials of this article may be of interest for teachers of higher education institutions

Training of engineers in mathematics at university on the basis of the information cybernetic approach

© 2017 Authors. The relevance of the presented research is conditioned by the necessity of continuous formation of a competitive personality. The competitiveness of the state in the world market is caused by the level of transport and energy infrastructure, the level of training and qualification of the country's engineers. These have determined the task currently being decided by educational organizations to find new resources for training of highly qualified specialists for the diverse industries to develop. Analyzing the multicomponent training of future engineers, experts note the pedagogical potential of mathematical disciplines in the formation of professional competence of engineers. The potential of the cyber-information approach in the training of engineers at university is disclosed and justified in the article, the potential is represented by a combination of the following resources: motivational-adaptive, subjective, integrative, managerial. The authors developed the author's method of training of future engineers in mathematics at university on the basis of the information-cybernetic approach, represented by successively implemented modules: "I get to know myself." "Intellectual puzzle", "Entertaining modeling", "Creative laboratory". The effectiveness of the developed methodology was proved in the course of the experimental research carried out from 2012 to the present time and the experimental training in mathematics at university using the didactic potential of the information cybernetic approach. The materials of the article can be useful in practical terms for university teachers of mathematics striving to significantly improve the level of mathematical training of future engineers

Differentiated tasks system in math as a tool to develop university students’ learning motivation

© 2015 by iSER, International Society of Educational Research. The relevance of the study is due to the direction of the modern education model on the formation of a competitive creative personality, with the need for continuous self-improvement and self-development. It should be emphasized that the effectiveness of training students is largely determined by the level of motivation, interest, and the subjects’ personal involvement. Therefore, the article is aimed at the disclosure of the mechanisms of development of learning motivation of students through the system of differentiated tasks. The leading approach to the study of the problem was the personal-active approach, which aims to reveal the discussed question from the perspective of dialogism, subjectivity and individuality. The article presents the characteristics of the developed and proven system of differentiated tasks in mathematics, focused on the development of learning motivation of students, as well as providing empirical evidence about the results of implementation. The article describes the principles on which we identified three levels of tasks in mathematics: “algorithms”, “problem-search tasks”, and “creative tasks”. The article may be useful to teachers of higher education

РАВНОВЕСНОЕ РАСПРЕДЕЛЕНИЕ БОРА МЕЖДУ МЕТАЛЛОМ СИСТЕМЫ FE - C - SI - AL И БОРСОДЕРЖАЩИМ ШЛАКОМ

Using the HSC 6.1 Chemistry software package (Outokumpu) and simplex-lattice planning, the thermodynamic modeling of the boron equilibrium distribution between iron containing 0.2 % of C, 0.35 % of Si, 0.028 % of Al (in the terms and hereinafter indicated mass. %) and slag of the system СаО – SiO2 – Аl2O3 – 8 % МgO – 4 % В2O3 was carried out in a wide range of chemical composition and at temperatures of 1550 °С and 1600 °С. Adequate mathematical models in the form of III degree polynomial obtained for each temperature, describes the equilibrium distribution of boron between slag and metal depending on the slag composition. Mathematical modeling results are presented graphically in the form of diagrams of composition – boron equilibrium distribution. It is shown that slag basicity affects on the boron distribution coefficient. Thus, increasing the slag basicity from 5 to 8 at temperature of 1550 °С reduces the boron distribution coefficient from 160 to 120 and, as a consequence, increase the boron content in the metal from 0.021 % at LB = 159 to 0.026 % at LB = 121, that is, growth slag basicity is beneficial to the development of boron recovery process. The positive effect of the slag basicity on boron recovery process in the researched range of the chemical composition can be explained according to the slag phase composition and thermodynamics of boron reduction reactions. The temperature growth of the metal negatively affects the boron recovery. Equilibrium boron distribution coefficient increases by an average of 10 units with an increase in temperature to 1600 °C. The diagrams contain marked field of slag chemical composition with 53 – 58 % of CaO, 8.5 – 10.5 % of SiO2 and 20 – 27 % of Al2O3, providing boron distribution coefficients at level of 140 – 170 at temperature range of 1550 – 1600 °C and allowing to expect boron concentration in the metal at the level of 0.020 % at LB = 168 % and 0.023 % at LB = 139 at the 4 % of B2O3 in the slag initial. © 2017 National University of Science and Technology MISIS. All rights reserved

Evolution of oxygen-ion and proton conductivity in Ca-Doped Ln2Zr2O7 (Ln = Sm, Gd), located near pyrochlore fluorite phase boundary

Sm2-xCaxZr2O7-x/2 (x = 0, 0.05, 0.1) and Gd2-xCaxZr2O7-x/2 (x = 0.05, 0.1) mixed oxides in a pyrochlore-fluorite morphotropic phase region were prepared via the mechanical activation of oxide mixtures, followed by annealing at 1600 ?C. The structure of the solid solutions was studied by X-ray diffraction and refined by the Rietveld method, water content was determined by thermogravimetry (TG), their bulk and grain-boundary conductivity was determined by impedance spectroscopy in dry and wet air (100-900 ?C), and their total conductivity was measured as a function of oxygen partial pressure in the temperature range: 700-950 ?C. The Sm2-xCaxZr2O7-x/2 (x = 0.05, 0.1) pyrochlore solid solutions, lying near the morphotropic phase boundary, have proton conductivity contribution both in the grain bulk and on grain boundaries below 600 ?C, and pure oxygen-ion conductivity above 700 ?C. The 500 ?C proton conductivity contribution of Sm2-xCaxZr2O7-x/2 (x = 0.05, 0.1) is ~ 1 ? 10-4 S/cm. The fluorite-like Gd2-xCaxZr2O7-x/2 (x = 0.1) solid solution has oxygen-ion bulk conductivity in entire temperature range studied, whereas proton transport contributes to its grain-boundary conductivity below 700 ?C. As a result, of the morphotropic phase transition from pyrochlore Sm2-xCaxZr2O7-x/2 (x = 0.05, 0.1) to fluorite-like Gd2-xCaxZr2O7-x/2 (x = 0.05, 0.1), the bulk proton conductivity disappears and oxygen-ion conductivity decreases. The loss of bulk proton conductivity of Gd2-xCaxZr2O7-x/2 (x = 0.05, 0.1) can be associated with the fluorite structure formation. It is important to note that the degree of Ca substitution in such solid solutions (Ln2-xCax)Zr2O7-? (Ln = Sm, Gd) is low, x < 0.1. In both series, grain-boundary conductivity usually exceeds bulk conductivity. The high grain-boundary proton conductivity of Ln2-xCaxZr2O7-x/2 (Ln = Sm, Gd; x = 0.1) is attributable to the formation of an intergranular CaZrO3-based cubic perovskite phase doped with Sm or Gd in Zr sublattice. ? 2019 by the authors.371C-9F16-EBDE | Eduarda GomesN/

Numerical simulation of the fractures of anisotropic materials characterized by the high degree of anisotropy of elongation at break

The failure criteria of anisotropic materials, the criteria being expressed via deformations, are rarely applied in practice, and are usually used for low-ductility materials. Another situation involves the simulation of failures in materials with the high anisotropy of mechanical properties and that suffer elastic-brittle fracture. For such materials the failure criteria are formulated using ultimate strains and strain tensor invariants. For simulating the fractures of materials that are characterized by the anisotropy of strength properties, the failure criteria are applied with the critical values of stresses and strains, as well as their intensities. Using the value of cumulative plastic strain as a failure criterion does reflect the anisotropy of elastic and plastic properties of a material, but it does not reflect that of the strength properties. The application of this method allows accounting the total plastic strain induced by tension and compression in the conditions of the wave strain of targets during their impact loading

The assessment of morbidity and socio-medical care for women prisoners living with HIV

Rates of HIV infection among women prisoners of Sverdlovsk region and quality of medical observation in prisons and after release were studied. Methods of retrospective and prospective monitoring, expert evaluation, epidemiological, statistical were used. The basic group included 391 women living with HIV, the comparison group - 2818 men living with HIV. Found, that prevalence of HIV among women prisoners is 2.3 times higher than among male prisoners. Among women prisoners living with HIV the rates of viral hepatitis С are 90%, drug addiction -88%, sexually transmitted infections - 42%. HIV-infection of 67.5% of women has been diagnosed in prison, among the remaining - 40.7% in women’s clinics. Due to multi-professional approach in treatment and care for people living with HIV in prisons and in the AIDS Centre adherence to medical observation and treatment increases after release from prison.Изучена распространенность ВИЧ-инфекции среди женщин-осужденных Свердловской области и качество их диспансерного наблюдения в условиях заключения и после освобождения. Использованы методы ретроспективного и проспективного наблюдения, эпидемиологический, экспертной оценки, статистические. Основная группа — ВИЧ-инфицированные женщины-осужденные 391 чел., группа сравнения - ВИЧ-инфицированные мужчины-осужденные 2818 чел. Установлено, что пораженность осужденных женщин ВИЧ-инфекцией в 2,3 раза выше, чем мужчин. Среди ВИЧ+женщин у 90% выявлен вирусный гепатит С, 88% - наркотическая зависимость, 42% - инфекции, передающиеся половым путем. У 67,5% женщин ВИЧ-инфекция выявлена в местах заключения, а из числа выявленных на свободе 40,7% - в женских консультациях. Внедрение мультипрофессионального подхода в оказании помощи ВИЧ-инфицированным в учреждениях УИС и в центре СПИД способствует повышению приверженности пациентов диспансерному наблюдению и лечению после освобождения из заключения

Multilevel education in public health organization in Ural state medical university: traditions, activities, results, challenges

The article presents the experience of multilevel system in the field of public health and health care organization and management in higher and additional professional education in Ural State Medical University, forms of activities of the University in the healthcare management. The role of the Department of public health in health management training is represented.В статье представлен опыт организации многоуровневой системы подготовки кадров в области организации и управления здравоохранения по программам высшего и дополнительного профессионального образования в Уральском государственном медицинском университете, организационные формы участия университета в сфере управления здравоохранением. Отражена роль кафедры общественного здоровья и здравоохранения в подготовке управленческих кадров для здравоохранения

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Exsolution has been intensively studied in the fields of energy conversion and storage as a method for the preparation of catalytically active and durable metal nanoparticles. Under typical conditions, however, only a limited number of nanoparticles can be exsolved from the host oxides. Herein, we report the preparation of catalytic nanoparticles by selective exsolution through topotactic ion exchange, where deposited Fe guest cations can be exchanged with Co host cations in PrBaMn1.7Co0.3O5+delta. Interestingly, this phenomenon spontaneously yields the host PrBaMn1.7Fe0.3O5+delta, liberating all the Co cations from the host owing to the favorable incorporation energy of Fe into the lattice of the parent host (Delta E-incorporation = -0.41 eV) and the cation exchange energy (Delta E-exchange = -0.34 eV). Remarkably, the increase in the number of exsolved nanoparticles leads to their improved catalytic activity as a solid oxide fuel cell electrode and in the dry reforming of methane

MECHANICALLY ACTIVATED ANATASE AS A SORBENT AND PHOTOCATALYST FOR THE REMOVAL OF Cr(VI) FROM AQUEOUS SOLUTIONS

A method for modifying anatase has been developed, which improves its ability to remove Cr(VI) from aqueous solution by adsorption. A photocatalytic conversion of Cr(VI) to Cr(III) occurs first.Работа выполнена при финансовой поддержке Российского научного фонда, проект № 21-73-20039