Zeta potential change of Neuro-2a tumor cells after exposure to alumina nanoparticles

In recent years, researches have paid much attention to the physical, chemical, biophysical and biochemical properties of a cell surface. It is known that most of the cells’ surfaces are charged. This charge depends on the biochemical structure of the cell membranes. Therefore, measurement of a cell surface charge is a significant criterion that gives information about the cell surface. Evaluation of the cells zeta-potential is important to understand the interaction mechanisms of various drugs, antibiotics, as well as the interaction of nanoparticles with the cell surface. In this study, we use the dynamic light scattering method to detect the zeta-potential change of Neuro-2a tumor cells. It has been observed that zeta-potential shifted to negative values after exposure to metal oxide nanoparticles and inducing apoptosis

Semi-analytical hybrid approach for modelling wave motion excited by a piezoelectric transducer in a laminate with multiple cracks

A semi-analytical hybrid approach is presented here to simulate the dynamic behaviour of a multi-layered elastic waveguide with a system of delaminations and a piezoelectric transducer mounted on the surface of the waveguide. The proposed hybrid approach combines the advantages of the frequency domain spectral element method, which is applied to discretize a complex-shaped piezoelectric structure, and the boundary integral equation method employed to simulate wave propagation in multi-layered waveguide with multiple delaminations. The proposed method is applicable to the multi-parameter analysis of the phenomena related to elastic wave scattering and excitation. The advantages of the presented extended semi-analytical hybrid approach method along with the results of the parametric analysis of wave propagation in the considered structures are discussed

Investigation of the Diffusion Characteristics of Narrow Fractions of Cenospheres with Network Structure of a Glass-Crystalline Shell

Выполнено исследование взаимосвязи состава, строения и диффузионных свойств стеклокристаллических мембранных материалов на основе узких фракций ценосфер с сетчатой стеклокристаллической оболочкой в широком диапазоне изменения макрокомпонентного и фазового состава (мас. %): SiO2 – 56–68, Al2O3 – 37–38, муллит – 35–48, кварц – 1–3, кристобалит – 0–16, анортит – 0–6, стеклофаза – 31–63. Установлено, что коэффициенты проницаемости Не и Н2 стеклофазы ценосфер с оболочкой сетчатого строения существенно превышают аналогичные значения для силикатных стекол различного состава. Значения селективности стеклокристаллических мембранных материалов на основе узких фракций ценосфер соответствуют высокому уровню, что определяет перспективность их использования в процессах мембранного разделения и глубокой очистки гелия и водородаThe study of the relationship between the composition, structure and diffusion properties of glass-crystalline membrane materials based on narrow fractions of cenospheres with a network glass-crystalline shell in a wide range of changes in the macrocomponent and phase composition (wt. %): SiO2 – 56–68, Al2O3 – 37–38, mullite – 35–48, quartz – 1–3, cristobalite – 0–16, anorthite – 0–6, glass phase – 31–63 was carried out. It was found that the permeability coefficients of He and H2 of the glass phase of cenospheres significantly exceed those for silicate glasses of various compositions. The selectivity values of glass-crystalline membrane materials based on narrow fractions of cenospheres with a network glass-crystalline shell correspond to a high level, which determines the prospects of their use in membrane separation processes with the production of He and H2 gases of high purit

Low-dimensional pseudoboehmite structures for microorganism adsorption

Low-dimensional structures consisting of pseudoboehmite nanopetals are synthesized by hydrolysis of electroexplosive aluminum nanopowder. The physical and chemical properties of the synthesized nanostructures are studied, such as morphology, particle size, specific surface area, phase composition, and zeta-potential. The production of a hybrid material on the basis of cellulose acetate microfibers and low-dimensional pseudoboehmite structures is described. Using the example of gram-negative and gram-positive bacteria, we show the microorganism adsorption capacity of pseudoboehmite nanopetals and the hybrid material

МОТИВАЦИОННО-ЦЕЛЕВОЕ УПРАВЛЕНИЕ СОВМЕСТНОЙ ДЕЯТЕЛЬНОСТЬЮ ПРЕПОДАВАТЕЛЯ И КУРСАНТОВ ВОЕННОГО ОБРАЗОВАТЕЛЬНОГО УЧРЕЖДЕНИЯ

Article deals with problems of motivation when setting goals together educational activities in the training of military personnel. Considered: the problem of organizing joint activities of students; the need to design their learning objectives tree for the design trajectory personal action in collaboration with the teacher work. The recommendations for the solution of the problems, referring to the design theory of motivation in the education field of military personnel.Purpose: the consideration of innovative forms of education in ennyh-frames.Methodology: theoretical modeling; the method of ownership of observation; formal pedagogical method.Results. We introduce the concept – «management of motivations and of purposes» which is considered in relation to the organization and conduct of joint activities of students and tea-chers training military establishments. The authors give a comparative analysis of the work colleagues as part of the problem. The authors make a brief description of the model «management of motivations and of purposes». Make recommendations for the implementation of the model in the educational process of the military institution.The article has scientific value, as it contains a generalization of the authors, there are scientific conclusions aimed at solving problems on the organization of joint activities of all persons of educational process.Practical implications: general pedagogy, history of pedagogy and education.Статья посвящена проблемам мотивации при постановке целей совместной воспитательной деятельности в процессе подготовки военных кадров. Рассмотрены: проблемы организации совместной деятельности курсантов; необходимость их обучения конструированию дерева целей для проектирования траектории личных действий в совместной с преподавателем работы. Даны рекомендации по решению поставленных проблем, ссылаясь на проектирование теории мотивационного поля в воспитании военных кадров.Цель: рассмотрение вопроса о построении модели совместной деятельности, как инновационной формы воспитания военных кадров.Метод или методология проведения работы: теоретическое моделирование, метод сопричастного наблюдения, формальный педагогический метод.Результаты. В статье вводится понятие – «мотивационно-целевое управление», которое рассматривается применительно к организации и проведению совместной деятельности курсантов и преподавателей учебных военных учреждений. Авторы дают теоретический сравнительный анализ научных работ коллег в рамках рассматриваемой проблемы. Предлагают краткое описание модели мотивационно-целевого управления и дают рекомендации по внедрению модели в образовательный процесс военного учреждения.Статья имеет научную ценность, так как содержит обобщения авторов, обладающие новизной, имеются научные выводы, направленные на раскрытие и решение проблем по организации совместной деятельности всех субектов образовательного процесса.Область применения результатов: общая педагогика; история педагогики и образования

Production of Refractory Bricks through Combustion Synthesis from Metallurgical Wastes and the Thermo-Physical Properties of the Products

Industrial symbiosis is one of the key approaches to meet sustainable and low carbon production targets. Thus, through circular approaches, it is possible to reduce the use of natural crude materials and make production processes waste-free in the metallurgical industry. The purpose of this study was to study the possibility of using various metallurgical waste and low-grade semi-finished products, which do not have a direct application area, in the production of heat-resistant carbon-containing refractory bricks through the combustion synthesis (CS) method. In the experiments, used metallurgical wastes were wet filter cake (FC), sludge (S), and refractory magnesite scrap (MS) while semi-products were rich and poor dust of chrome spinel (Cr-S). Simultaneously with the experiments, thermochemical simulation studies were carried out using the HSC Chemistry 6.12 to predict the thermodynamic properties of the reactions and possible reaction products. Thermal conductivity coefficients were determined in products in terms of thermal properties of composite samples, they were between 0.511 and 1.020 Wm/K. The phase compositions of the produced samples were determined via XRD technique. The TG-DTA technique was used to characterize thermal behavior of products. In addition, mechanical properties were determined by compression strength test. As a result of experiments, it was observed that Cr-S-rich-based samples showed a promising result in comparison to others: increasing amount of useful carbide phases were formed and demonstrated a high value of mechanical properties. Compression strength was increased from 2.7 MPa (sample №4) to 15.8 MPa (sample №1) with increasing chromite-containing phases in the green samples

Catalytic Epoxidation of 3-Carene and Limonene with Aqueous Hydrogen Peroxide, and Selective Synthesis of α-Pinene Epoxide from Turpentine

The epoxidation of turpentine (technical α-pinene), 3-carene, and limonene with aqueous hydrogen peroxide was studied in a new catalytic system employing manganese sulfate, salicylic acid, sodium bicarbonate, and acetonitrile, as a polar solvent. The proposed approach makes it possible to carry out a “chemical separation” of turpentine components, yielding valuable individual derivatives of monoterpenes without the need to isolate individual monoterpene reagents. Specific methods have been developed for the production of α-pinene epoxide, 3-carene epoxide, limonene diepoxide, as well as for two related compounds: 3-carene-5-one and 3-carene-2,5-dione