Studies of changes in the activity of dissolved oxygen in the simulation of ferromanganese filtration

The article deals with the solution of an urgent problem related to the process of filtration refining of ferroalloys. Based on the data obtained, it was found that combining the filtration process with casting ensures the flow of refined melt directly into the mold cavity and partial or complete elimination of secondary oxidation. To identify the underlying mechanism of filtration refining, the interaction of liquid metal with the filter in its separate pore channel was simulated. The main technological parameters of the process under consideration are calculated and practically confirmed

Studies of changes in the activity of dissolved oxygen in the simulation of ferromanganese filtration

The article deals with the solution of an urgent problem related to the process of filtration refining of ferroalloys. Based on the data obtained, it was found that combining the filtration process with casting ensures the flow of refined melt directly into the mold cavity and partial or complete elimination of secondary oxidation. To identify the underlying mechanism of filtration refining, the interaction of liquid metal with the filter in its separate pore channel was simulated. The main technological parameters of the process under consideration are calculated and practically confirmed

RESEARCH OF NEUROPROTECTIVE ACTIVITY OF PHYTOREMEDY «PHYTOTON»

The research of neuroprotective activity of phytoremedy «Phytoton» was performed. In experiments on white rats (Wistarline) it was found that «Phytoton» possesses pronounced neuroprotective activity. «Phytoton» reduced. the level of anxiety in animals, attenuated substituting passive defensive reaction, increased orientation and exploratory behavior, and provided nootropic, anxiolytic, antihypoxia action

Complexes of Polyvinylpyrrolidone and Polyethylene Glycol with Palladium(II) Ions: Characterization and Catalytic Activity

Received: 21.06.23. Revised: 13.07.23. Accepted: 19.07.23. Available online: 24.07.23.The composition of the complex compounds was determined by potentiometric and conductometric methods.IR spectroscopy and SEM confirmed the coordination of polymeric ligand to palladium and allowed evaluating the morphology of the complex surface.The catalytic activity of the complexes in the oxidation of octene-1 by inorganic oxidizers under mild conditions was evaluated.In this work, we obtained complexes by mixing aqueous solution of palladium(II) chloride with polyvinylpyrrolidone and polyethylene glycol. The composition of the complex compounds was determined by potentiometric and conductometric titration. IR spectroscopy and scanning electron microscopy (SEM) confirmed the coordination of polymeric ligand to palladium and allowed evaluating the morphology and features of the complex surface. The catalytic activity of the synthesized compounds in the oxidation of octene-1 by inorganic oxidizers (NaBrO3, K2S2O8) in aqueous-organic media in dimethyl sulfoxide (DMSO) under mild conditions was calculated. The reaction product was octanone-2, obtained in good yield (62–98%). Quantitative analysis of octanone-2 was made by the gas-chromatographic method. Mass spectrometry confirms the formation of octanone-2. The complexes are able to participate in five consecutive catalytic cycles without significant loss of catalytic efficiency. Oxidation of octene-1 proceeds by the oxidation-reduction mechanism and consists of two key stages

Combustion of Hydrogen Sulfide-Containing Oil on the Surface of the Water and Possible Applications of Combustion Method at Sea

Oil production in sea conditions is associated with certain difficulties of the field development process due to technological peculiarities of oil production at sea. The Caspian Sea is an enclosed pond with a very sensitive ecosystem, therefore, maritime operations here meet higher requirements than in open ponds. The uniqueness of the Caspian Sea is in the fact that its biological wealth has no analogues in the world, therefore, mining without complying with strict ecological requirements can cause irreparable harm to the environment. This work deals with the analysis of the possibility to use controlled combustion in situ in case of accidents on the Kashagan oil field which is located in the Caspian Sea. The Kashagan oil field is distinguished by a high content of hydrogen sulphide. In order to study the operational possibilities of oil combustion in situ, the process of evaporation and combustion of desulfurized oil from the Kashagan field depending on salinity of water was studied in this work. The process of evaporation of hydrogen sulphide from hydrogen sulphide-containing oil and the peculiarities of its combustion on water surface were studied in this work. It has been stated that the main difference in oil combustion with a high content of hydrogen sulphide is that the oil combustion process leads to the increase of sulfur concentration in oil residue after combustion

Legal regulation of agriculture in Kazakhstan: problems and prospects

Abstract: The problem of food security is the top priority of the economic policy strategy of any state, the effectiveness of this solution influences social, political, and ethnic stability in society. Food security, as an integral part of national security depends considerably on public resources aimed at preventing imbalance in the market, production and social environment of the country. Formation of public resources for all types of food, public grains resources and other strategically important agricultural products in the right quantities, depending on the needs of the population, is able to provide food security. The global financial crisis that affected the agricultural sector and the economy, created a real threat to global food security, and this in turn requires a reform of existing mechanisms and development of new ones to ensure food security at the international and national levels. Economic, political, and social security in the modern world is based on three aspects of security -food, energy and finance. According to the UN, more than 925 million people around the world suffer from hunger. This represents 12.5 percent of the world population (every eighth person). Of these, the vast majority -852 million people -live in developing countries, where 14.9 percent of the population is starving. The number of hungry people in the world remains unacceptably high. Given the current rate of the population growth, global food production must increase by 70% by 2050, while the population of the world to this time should reach 9 billion people

Aerogels Based on Graphene Oxide with Addition of Carbon Nanotubes: Synthesis and Properties

Nowadays numerous sorbents based on graphene and other carbon nanomaterials have been synthesized for the removal or collecting of oil remains due to its unique physico-chemical properties. Obtaining of aerogels based on graphene oxide and carbon nanotubes with addition of chitosan solution as a binder component is shown in this paper. Aerogels were synthesized by reduction of aqueous dispersion of graphene oxide using the reducing agents, followed by ultrasonic and thermal treatment. Ultrasound destroys the graphene layers, decreasing them in size, thereby exposing new layers to form edges that already have no stabilizing carboxyl groups, which are located at the edges, and participate in the formation of bonds. The surface morphology of obtained aerogels was studied by SEM. The study of the sorption capacity showed that graphene/CNTs aerogel is characterized by short absorption time and high sorption ability that depend on densities of the used solvents. All experimental results show the possibility of using the aerogels based on graphene and CNTs as sorbents for collection of oil residues

Influence of Magnetite Nanoparticles on Mechanical and Shielding Properties of Concrete

This paper presents an experimental study on the performance of shielding concrete with additives of magnetite nanoparticles. Two concretes with magnetite additives as well as one based concrete were tested. In order to achieve the high-performance concrete, all concrete mixes had a constant water/cement ratio of 0.45. In order to measure the mechanical properties, concrete samples were made in accordance with dimension such as 40 × 40 × 160 mm. But, for measurement of protective properties the concrete was made in accordance with dimension of rotary antennas such as 400 × 400 mm with a thickness of 10 mm. The nanoparticles Fe3O4 were synthesized by chemical condensation method. XRD have shown the presence of cubic structure of Fe3O4 spinel with crystallite size is equal to 130.0 Å. The TEM microphotograph shows that theFe3O4 nanoparticles are spherical, the range of sizes is 12‒30 nm. The magnetic retardation suggests that the magnetite nanoparticles have superparamagnetic properties. This is explained by the fact that under the influence of external magnetic field, they are single-domain, in other words, they become uniformly magnetized throughout the volume. The additives of magnetite nanoparticles at a concentration of 0.5% mass have not a negative effect on flexural strength. The samples with additives of magnetite nanoparticles showed better shielding of microwave radiation in the frequency range from 0.7 GHz to 13 GHz. The maximum efficiency of suppression of electromagnetic disturbance is equal to 19.9 dB at a frequency of 1.5 GHz with a thickness of 10 mm

Морфологические и физико-химические свойства наноструктурированной целлюлозы, полученной химическим и биологическим способами

The authors obtained samples of chemically pure, crystalline, microand nanostructured cellulose of various modifications using two approaches – biological and chemical. They studied these cellulose samples via scanning electron microscopy (SEM), thermogravimetric analysis, and infrared (IR) spectroscopy. To prepare cellulose microcrystals, they used the mild acid treatment method based on glycerolacid mixtures for treating cotton fibers. They showed that the chemical processing of cotton fiber ensured its dispersion with generation of microcrystals surrounded by a partially preserved amorphous shell. The authors produced bacterial cellulose (BC) films using the Komagataeibacter xylinus C3 strain in surface cultivation conditions. With a view of obtaining higher-quality SEM images, they applied chemical fixation of lipids and proteins with critical drying to fix the process of nanofiber synthesis by bacterial cells. The two-step fixation method helped find the fibrillar structure of a cellulose film, while the morphology of bacterial cells was not deformed. The authors made a comparative analysis of the IR spectroscopy results between chemically synthesized cellulose microcrystals and BC. The obtained cellulose samples do not contain lignin and hemicellulose, both samples are highly crystalline. The BC has an ordered structure, higher crystallinity and gets carbonized when exposed to air pyrolysis. A thermogravimetric analysis of the samples shows the absence of thermally stable impurities. Both cellulose samples of biological and chemical origin are thermally stable, and the initial decomposition temperature is high enough for cellulose materials. These results show that the authors have managed to create nanocellulose materials that might be potentially applied in various industries, such as pharmaceuticals, functional composites, engineering, etc

The development of future foreign language teachers’ digital competences in creating multimedia tutorials

Introduction. The article considers the problem of the development of future teachers’ digital competences in creating foreign language multimedia tutorials and presents the results of the corresponding research conducted by the authors. In the context of the digitalisation of education, the foreign language multimedia tutorials represent an effective means of organising and integrating authentic audio-visual materials into the learning process. Nevertheless, FL (foreign language) teachers today face the problem of the lack of the competences, including digital ones, necessary for the development of effective multimedia tutorials, which cannot be created without the awareness of the methodological foundations of their designing, mastering of the relevant software tools and obtaining the corresponding level of digital skills of their usage. Aim. The current research is aimed to identify the effectiveness of the training course for future teachers in the development of foreign language multimedia tutorials based on authentic audio-visual materials. The training course was conducted at Academician E. A. Buketov Karaganda University among 30 graduate students. Methodology and research methods. The research work was based on the determination of four levels of training in the field of development of multimedia foreign language tutorials: recognition-based, reproductive (adaptive), heuristic, creative. Results and scientific novelty. The developed training course proved its effectiveness in increasing the level of development of digital competences of future FL teachers in the field of designing multimedia educational resources. The research results demonstrated that 80 % of the participants achieved the heuristic level in the field of the development of digital educational resources, namely multimedia tutorials, getting the required 60 % and more points (according to Bespalko V. P.) in the final assessment of academic achievement. Practical significance. The corresponding authoring experimental training course contributes to solving the problem of the development of the future FL teachers’ competences when creating multimedia educational resources, and to the problem of skills formation when using appropriate software to create multimedia educational resources.В статье рассматривается проблема развития цифровых компетенций будущих учителей в области разработки мультимедийных учебных пособий по иностранному языку, а также представлены результаты соответствующих исследований, проведенных авторами. В контексте цифровизации образования мультимедийные учебные пособия по иностранному языку представляют собой эффективное средство для организации аутентичных аудио- и видеоматериалов и их интеграции в учебный процесс. Тем не менее в настоящее время учителя иностранных языков сталкиваются с проблемой недостаточного уровня развития компетенций, в том числе цифровых, необходимых для создания эффективных мультимедийных учебных пособий, которые невозможно спроектировать без знания методологических основ их разработки, а также владения соответствующими программными инструментами. Цель исследования состоит в выявлении эффективности курса подготовки будущих учителей к разработке мультимедийных учебных пособий по иностранному языку на основе аутентичных аудио- и видеоматериалов, проведенного среди 30 студентов выпускного курса на базе Карагандинского университета им. академика Е. А. Букетова. Методология и методы исследования. В основу исследования положено выделение 4 уровней подготовки в области разработки мультимедийных учебных пособий по иностранному языку: распознавательного, адаптивного (репродуктивного), эвристического (продуктивного), творческого. Результаты и научная новизна. Разработанный авторский курс доказал свою эффективность в повышении уровня развития цифровых компетенций будущих учителей иностранного языка в области разработки мультимедийных образовательных ресурсов. Результаты проведенного исследования показали, что 80 % участников достигли эвристического уровня в области разработки цифровых образовательных ресурсов, а именно мультимедийных учебных пособий, набрав требуемые 60 % и более баллов (по В. П. Беспалько) в итоговом оценивании учебных достижений. Практическая значимость. Экспериментальный учебный курс в рамках исследования вносит вклад в решение проблемы развития цифровых компетенций будущих учителей иностранного языка в области разработки мультимедийных учебных пособий и формирования навыков использования соответствующего программного обеспечения для создания мультимедийных образовательных ресурсов.The authors express their gratitude to the Editorial Board of the Education and Science Journal for their support in publishing the research results. Moreover, the authors would like to thank the reviewers, whose comments helped to improve the structure and the content of the article.Авторы выражают благодарность редакционной коллегии журнала «Образование и наука» за оказанную поддержку в публикации результатов исследования, а также рецензентам, чьи замечания помогли улучшить структуру и содержание изложенного в статье материала