Conceptualization of user activities in the social network in the conditions of distance education

No artigo, as mídias sociais são analisadas através do foco de entender este último como um espaço virtual da mídia, o que reflete indicadores identificados dos usuários como: interesse, desejo, entusiasmo e direção dos processos de integração. A relevância do estudo é determinada pelo desenvolvimento insuficiente e inconsistência dos conceitos e resultados empíricos da pesquisa sobre os processos de diferenciação da comunidade das redes sociais e seu papel nas condições da educação a distância. Foram utilizados os métodos filosóficos, de análise e hermenêutica: interpretação, conceituação, análise comparativa. Como base teórica e metodológica, utilizamos o aparato categórico da filosofia social, matemática, teoria da prática, pragmatismo, epistemologia social. Utilizamos abordagens para extrair a atividade de grupos de usuários em uma rede social de várias camadas: 1) extrair grupos em cada camada separadamente e, em seguida, combinar comunidades em todas as camadas; 2) primeiro transformar a rede social em uma camada e, em seguida, procurar diferentes grupos dentro

Analysis of approaches to study identification in social media

The nature of the social influence of media on social processes, the production of virtual information practices, to study these processes currently actualizes the need to use modern new tools for collecting, processing and data analysis methods. The purpose of this work is to analyze the activity of university graduates in communities, their identification through the collection of data from social networks. Assessment of the activity of graduates in social networks was carried out by “downloading” messages and news from online university communities. For each message, activity labels (“likes”, reposts, comments) were collected and graduates of these universities were identified (reconciliation with the register of graduates was carried out). The focus of the analysis is on identifying the actions of graduates - loyalty in the media space and the dissemination of information about the university community. The main methodological guideline was the approach within the framework of the microsociological paradigm, in particular, the idea of symbolic interactionism. The heuristic potential of using big data to analyze the activity of university graduates in communities allows us to expand our methodological arsenal and overcome the limitations of existing traditional methods of collection and analysis. The main research methods: interface programming, social network analysis of user interaction in social media, Web-crawling using a search engine, statistical data processing. Results: the main digital strategies of university graduates are characterized by the expansion of the audience, the promotion of content caused by the interest of users depending on the focus of the group. Four types of alumni communities have been distinguished: groups that identify with social development, with charity, with scientific research, and education. The high average value of the activity index belongs to charitable foundations, followed by the community of culture and science. The lowest average value of the activity index is recorded in educational communities

Tensile Adhesion Strength of Atmospheric Plasma Sprayed MgAl₂O₄, Al₂O₃ Coatings

This study analyses the distribution of stress during the testing of glued cylindrical specimens with thermally sprayed MgAl2O4, Al2O3 oxide coatings in order to evaluate the tensile adhesion strength. The set of studies that make up this work were conducted in order to evaluate the influence of the geometric parameters of cylindrical test specimens, 25 mm in diameter by 16–38.1 mm in height, on the measured tensile adhesion strength of the specimens. The stress and strain states inside the coating and at the coating-substrate interface were determined using the finite element modelling method. The debonding mechanisms, failure mode and influence of the coating microstructure on bond strength are also discussed. The finite element stress analysis shows a significant level of non-uniform stress distribution in the test specimens. The analysis of the results of the modelling stresses and strains using the finite element method for six types of cylindrical specimens, as well as the values obtained for the adhesion testing of MgAl2O4, Al2O3 coatings, show a need to increase the height of the standard cylindrical specimen (according to ASTM C633-13 (2021), GOST 9.304-87). The height should be increased by no less than 1.5–2.0 times to reduce the level of a non-uniform stress distribution in the separation area

Potential of the dynamic approach to data analysis

Explores the potential of a dynamic data analysis approach to study user behavior in social networks. Currently, information appears on social networks that allows differentiating user groups by their activity within the technical capabilities of a particular social network. The description of the information field of Tomsk is presented, a brief analysis is given. A dynamic approach to the study of user behavior, the structure of nodes and connections of social networks makes it possible to identify the rate of growth or decrease in the size of the network, the redistribution of connections between groups. There are four main stages in the analysis of social networks: 1) data collection; 2) selection of data for analysis; 3) selection and application of the analysis method; and 4) drawing conclusions. To obtain a complete picture of the information field of the Tomsk region, posts for 2019 were unloaded from all regional communities. All posts were classified based on training sample and specialized machine learning algorithm

Evaluation of the influence geometric parameters of a cylindrical specimen for tensile adhesion testing of thermally sprayed coating

The problem of calculating the required adhesion strength and the accuracy of measuring the adhesive/cohesive strength of thermally sprayed coatings (thermal barrier, electrically insulating, irradiation) on a cylindrical test specimen is of practical interest from the point of view of improving the reliability of highly loaded parts of internal combustion engines of agricultural machines, various parts of the aerospace and nuclear industries. There have been carried out a set of studies on the application in practice of standard test method for assessing adhesion or cohesion strength of electrically insulation plasma sprayed coating Al2O3 on standard and elongated specimens with a diameter of 25 mm in accordance with standards ASTM C633-13, GOST 9.304-87. In order to assess the influence of witness specimen’s geometry at common coating adhesion, there were selected 6 types of cylindrical specimens. A finite-element stress analysis was used to evaluate stress-strain state of the two bonded cylindrical specimens of the same geometry with coating by tensile testing. The uniformity of stress distribution at the interface coating/substrate was found for three elongated specimens. Compared to standard tensile testing of a cylindrical specimen, the applied significance of the conducted studies that it is possibility to obtain more accurate experimental data of bond strength. There is also needed further research in the field of determining the most optimal geometry of the witness specimen for evaluating the tensile adhesion strength of thermal spray coating

Identification of the self-oscillating mode in metal-cutting machines in the production of agricultural machinery

The production of modern agricultural machinery includes various technological chains machining workshops, consisting mostly of turning and milling machining centers. The influence of self-oscillations on the dynamic characteristics of mechanisms for various purposes is due to the increased requirements for the quality and reliability of products of modern machines and units. Timely detection and reduction of the impact of oscillatory processes makes it possible to qualitatively optimize the design of mechanisms. A special role in the process of operation is exerted by self-oscillations on metal-cutting machines in the processing of materials. The consequence of the self-oscillatory process is a violation of the performance of a metal-cutting machine, expressed in a parametric (accuracy) failure. In this paper, the possibility of using parametric spectral analysis for the early identification of a self-oscillating process in hexapod machine tools was evaluated, for which the objective function was determined, i.e. the value of the damping coefficient of the dynamic system

Germ plasm provides clues on meiosis: The concerted action of germ plasm granules and mitochondria in gametogenesis of the clam Ruditapes philippinarum

Summary Germ plasm-related structures (GPRS) are known to accompany meiotic cell differentiation but their dynamics are still poorly understood. In this study, we analyzed the ultrastructural mechanisms of GPRS transformation during oogenesis and spermatogenesis of the bivalve mollusc Ruditapes philippinarum (Manila clam), exploring patterns of GPRS activity occurring at meiosis onset, sex-specific difference/similarity of such patterns, and the involvement of mitochondria during GPRS-assigned events. In the two sexes, the zygotene-pachytene stage of meiosis is anticipated by three shared steps. First, the dispersion of germ plasm granules containing the germ line determinant VASA occurs. Second, the VASA protein deriving from germ plasm granules enters neighbouring mitochondria and appears to induce mitochondrial matter release, as supported by cytochrome B localization outside the mitochondria. Third, intranuclear VASA entrance occurs and the protein appears involved in chromatin reorganization, as supported by VASA localization in synaptonemal complexes. In spermatogenesis, these three steps are sufficient for the normal course of meiosis. In oogenesis, these are followed by the action of 'germ plasm granule formation complex', a novel type of structure that appears alternative to the Balbiani body. The possibility of germ plasm involvement in reproductive technologies is also suggested

Man-made load of industrial environment and its impact on human microbiota

People are exposed to a significant amount of man-made hazards upon contact with technological systems, and foundry engineering industrial sites belong undoubtedly to such systems. Foundry shops are characterized by high noise and temperature thresholds that affect the human body. Unsatisfactory condition of the air is considered to be an acute problem in foundry engineering. In this connection, the state of air and its composition change, which can certainly affect health of workers, and the latter may be seen in the respiratory, cardiovascular, nervous systems, and digestive organs functional changes. However, up to date, the effect of health hazards of foundry engineering on the microbiocenosis of human intestine remains poorly studied. The paper apprizes the microbiota of human large intestine being exposed to integrated effects of foundry engineering factors. A structural change of the intestinal coenotype accompanied by a change of absolute dominants and opportunistic microorganisms appearance is established. Intestinal microbiocenosis disorder is accompanied by a high detectability of parasitic protozoa Blastocystis spp. in the sampling material. The obtained blastocyst isolates have pathogenic properties of varying degree of manifestation, which indicates their unequal etiological significance in the development of the pathological process. The isolated strains of protozoa have a high anti-interferon activity characterizing their persistent properties. This characteristic brings along the displacement of normal symbionts by blastocysts and colonization of the intestinal mucous membranes with these protozoa

Variation of sperm morphology in Pacific oyster precludes its use as a species marker but enables intraspecific geo-authentification and aquatic monitoring

Abstract According to recent reports, shell morphology is unreliable for the identification of oysters because of the high phenotypic plasticity of these bivalves. Using COI DNA barcoding and sperm morphology, we reinvestigated the species validity of wild Pacific oyster Crassostrea gigas habituating the Peter the Great Bay (Sea of Japan). DNA barcoding confirmed the species validity of samples collected. Application of the single sperm pattern was not possible for species identification due to pronounced sperm plasticity being found. Six sperm morphs were discovered in the testes of each oyster collected. The amount of abundant sperm morphs and the type of the most dominant sperm pattern are particular to geographical localities that are individual depending on the environmental factors. Ecological monitoring of marine areas and commercially assigned intraspecific geo-authentification of the Pacific oyster seems possible based on the analysis of this species’ heterogenic sperm. Further work will be needed to test if sperm heterogeneity exists in other Ostreidae species and if heterogenic sperms could be used for interspecific analysis