Репозиторий Университета

© 2020 A series of novel metal complexes of Cu(II), Ni(II), Zn(II), Cd(II), and Mg(II) with four N-heterocyclic derivatives of 2-arylhydrazono-1,3-dicarbonyl compounds were isolated and identified by FT IR, 1H NMR, EPR, and UV–Vis spectroscopy. The crystallographic data for two organic ligands as well as Mg(II) and Ni(II) complexes were obtained. It was indicated that the organic species exist in the form of hydrazo-tautomers. The Ni complex is monomeric and is characterized by the tridentate coordination of the ligand through a deprotonated N-atom of the hydrazo-fragment and two neighboring O-atoms of the carbonyl and deprotonated hydroxy-groups. In the case of the Mg complex the polymeric structure is observed with the additional coordination through the sulfamide group of the organic specie. Formation constants of the complexes in ethanol aqueous solutions were calculated and correlated with some physical characteristics of the metal cations. Structures of yet unstudied metal complexes were proposed based on quantum-chemical modeling at the DFT/B3LYP level.

© 2020 A series of novel metal complexes of Cu(II), Ni(II), Zn(II), Cd(II), and Mg(II) with four N-heterocyclic derivatives of 2-arylhydrazono-1,3-dicarbonyl compounds were isolated and identified by FT IR, 1H NMR, EPR, and UV–Vis spectroscopy. The crystallographic data for two organic ligands as well as Mg(II) and Ni(II) complexes were obtained. It was indicated that the organic species exist in the form of hydrazo-tautomers. The Ni complex is monomeric and is characterized by the tridentate coordination of the ligand through a deprotonated N-atom of the hydrazo-fragment and two neighboring O-atoms of the carbonyl and deprotonated hydroxy-groups. In the case of the Mg complex the polymeric structure is observed with the additional coordination through the sulfamide group of the organic specie. Formation constants of the complexes in ethanol aqueous solutions were calculated and correlated with some physical characteristics of the metal cations. Structures of yet unstudied metal complexes were proposed based on quantum-chemical modeling at the DFT/B3LYP level.

© 2019 Wiley Periodicals, Inc. Control over biomaterials surface characteristics through surface modification or deposition of coatings is one of the key aspects of tissue engineering. This work was aimed to evaluate an effectiveness of various methods of chitosan-coating formations onto polylactide films using a number of techniques, such as vacuum deposition by electron-beam sputtering, chemical entrapment method, and electrospray procedure. Differently coated films were studied in terms of surface morphology (scanning electron and atomic-force microscopy), chemical structure (FTIR and X-ray photoelectron spectroscopy), and hydrophilic/hydrophobic balance (goniometry). The effect of coating technique on homogeneity of chitosan distribution over the substrate surface was evaluated using genipin and fluorescein isothiocyanate labeling as well as FTIR-microscopy. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48287.

© 2019 Elsevier Ltd Sandpiles are ubiquitous in nature and engineering applications but still not fully understood due to the complexity of structures and materials properties. This work presents a systematic study on the piles of Platonic solids using the discrete element method (DEM), mainly focusing on the effect of particle shape on the repose angles and bottom pressure distributions of the piles. Five Platonic particles (tetrahedron, cube, octahedron, dodecahedron, and icosahedron) were discharged to form wedge-shaped piles. It was found that the repose angle did not increase with the decrease of particle sphericity. The pile formed by the cubes had the maximum repose angle and its bottom stress dip phenomena were more significant in terms of dip width and depth than that of other particle piles. The pressure distributions at different heights of the piles were quite similar to those of the whole piles, while the shear stress distributions near the boundaries exhibited different characteristics for the cube piles. The analyses of packing structures in terms of coordination number, radial distribution function, as well as contact types inside the piles were discussed to understand the change of pressure dips. The influence of static friction on the repose angle was more significant and it enhanced the stress dip phenomenon.

© 2018 by the authors. Composite fibers and films based on cellulose and betulin were spun for the first time from solutions in N-methylmorpholine-N-oxide using the dry-wet jet method. The rheological properties of the composite solutions did not reveal any fundamental difference from those of the cellulose solutions. Introduction of betulin into the cellulose matrix (up to 10%) led to a decrease in the mechanical properties of the obtained fibers. The structure of the composite fibers was analyzed using SEM and X-ray diffraction methods. It was shown that the introduction of an additive into the cellulose matrix led to a decrease in the structural ordering of the cellulose. Comparative studies of the antibacterial activity of the composite films on Escherichia coli (E. coli) were carried out. The antifungal activity of the composite films was estimated using the strain of the O-97 Trichoderma viride Pers ex Fr (Gause Institute of New Antibiotics, Moscow, Russia).

© 2018, Media Sphera Publishing Group. All rights reserved. Objective. To study the formation and dynamics of development of suicidal behavior (SB) in medical students based on a personality/psychological approach. Material and methods. Two hundred and seventy-two students with- (n=75) and without SB (n=197) were examined. Psychopathological and psychological methods, and several questionnaires and scales were used. Results and conclusion. Personality and environmental characteristics as well as family loading were the leading factors of SB formation. Based on the results obtained, the authors developed a complex of preventive measures in the frames of three types of prevention (common, selective and indicative).

© 2018 Institute of Europe Russian Academy of Sciences. All Rights Reserved. Introduction. In the modern world, volunteering is one of the most effective ways for successful social development and improvement of the quality of human life. By the Decree of the President of Russia Vladimir Putin, the year of 2018 has been declared the Year of Volunteer in the Russian Federation. Voluntary activity has a positive impact not only on people who are provided with help but also on volunteers. Volunteering is beneficial for the formation and strengthening of moral position and citizenship, development of philanthropy, responsiveness, sense of justice, leadership skills. Besides, youth volunteering abroad has long been used as an important element of preparation to perform professional duties. Participating in the professionally focused volunteering, the student has an opportunity to gain professional experience, to check the correctness of own professional self-determination and career aptitude. Similar volunteer service is especially relevant for representatives of the “caring” professions - teachers, social workers, psychologists and doctors, i.e. people who have to be a priori ready for pro-social activity and have such qualities as goodwill, communicability and conscientiousness. The aim of the paper is to study the dynamics of the psychological characteristics of future health-care professionals regularly participating in professionally-oriented volunteer activities. Methodology and research methods. The research is based on competency-based and activity approaches to education. Also, research methodology involves the key provisions of the concept of a humanization of the pedagogical process of the higher education institution, and the basic principles of volunteers' activity declared in documents of the “United Nations Volunteers” (UNV) programme. The survey among students was the main method of information collection. Psycho-diagnostic tools involved: the assessment technique for communicative and organizing tendencies of an individual (V. V. Sinyavsky, V. A. Fedoroshin); the questionnaire for assessing the development level of empathic tendencies (A. Megrabyan, N. Epstein); the methodology for studying of valuable orientations of the individual (M. Rokich); the questionnaire “Motivation of Assistance” (S. K. Nartov-Bochaver). To objectify the data obtained, the Mann-Whitney U Test statistical technique was applied to reveal a difference in values of the parameter between small selections. Results and scientific novelty. The volunteer team was organized at the Department of Psychology of Health and Correctional Psychology of the Kursk State Medical University. This team is engaged in volunteering at the boarding school for children with disabilities. The authors came to the conclusion that the real directions of quasi-professional voluntary student unionism substantially correspond to the abilities and skills required of future health professionals. The authors analyzed the two-year dynamics of changes in students' psychological characteristics and professional competencies under the influence of their constant involvement in the volunteer movement. The key personality traits of an experienced student volunteer were designated: orientation towards humanistic values; motivation and readiness of providing assistance to needy people; well-developed communicative abilities and empathy. It has been established empirically that the level of development of these professionally important qualities among the student volunteers is initially above, compared with fellow students who were not involved in volunteering. Also, the level mentioned above continues to evolve actively due to the performance of the professionally focused and socially important volunteer mission. Practical significance. Results of the undertaken research prove convincingly that inclusion in the pedagogical process of higher education institution of professional volunteering as one of the priority activities contributes to the spiritual-moral education of students, the formation of professional and general humanistic outlook. In addition, student volunteering allows future graduates to find the necessary experience in the chosen field of employment.

© 2018 Academic Research Publishing Group. The use of new information technologies in the educational process intensifies the need for analyzing the existing resources suitable for teaching students in conformity with professional standards. The objective of this study is to consider the significance of survey services in teaching students market research, to analyze the efficiency of survey services, to prove their positive impact on the learning process and to determine requirements for educational survey services. The materials of the study were students' reports on conducting consumer surveys using either paper or online questionnaires. The research is based on a pedagogical experiment to analyze the applicability of Internet resources in the educational process. The results of students' research were processed through the comparison of the data obtained. The authors of the article have developed the life cycle of educational survey services. Based on stages of the life cycle, the authors have determined desired functional characteristics of free survey services, which will simplify the task of selecting a suitable educational tool. It has been confirmed that the exclusive use of Internet technologies in teaching students market research cannot be sufficient, and they should be used in combination with basic approaches to a marketing theory. The conducted pedagogical experiment has proved the consistency of Internet technologies as an educational tool. The authors of the article have revealed that despite undeniable advantages of online survey services they also have significant shortcomings, which makes it impossible to completely replace classic methods of collecting market information from this moment on. The introduction of free survey services into the educational process increases teaching efficiency and develops professional competencies within the existing standards. Defining functional requirements of the above-mentioned life cycle, teachers can choose the best educational survey service taking into account the stages students will go through while using it. An extensive use of information technologies is essential to the formation of new teaching materials and the renewal of the existing ones based on the synthesis of the classical theory of marketing and innovations.

© 2018 Media Sphera Publishing Group. All rights reserved. The objective of the present study was to evaluate the possibilities for the use of the changes in the AgNOR staining patterns in the neurons of the dorsal raphe nucleus (DRN) for the purposes of the medical differential diagnostics of the cases of death from chronic alcohol intoxication. We elucidated the characteristics of the activity of protein biosynthesis including the number and the area of the nucleoli in the nuclei of the neurons of the individuals who had died from chronic alcohol intoxication (n=20) in comparison with the subjects of the control group (n=13). To reveal the morphological structures associated with protein biosynthesis in the nucleoli of the serotoninergic neurons of the dorsal raphe nucleus in the brain, the histological preparations were stained with the use of the silver-staining technique for nucleolar organizer regions (AgNOR). The comparative statistical analysis of the results thus obtained with the calculated confidence coefficients was carried out. The aggregated analysis of all the dorsal raphe subnuclei revealed the impairment of the AgNOR staining characteristics in the neurons of the subjects who had died from chronic alcohol intoxication in comparison with those of the subjects comprising the control group. It is concluded that the results of the study can be used for differential diagnostics of deaths from chronic alcohol intoxication and other causes.

© 2011–2018 NSPU Bulletin All rights reserved Introduction. The problem of the article is addressed to clarify the question of how the content of practical pedagogical knowledge accumulated by the society can be understood from the point of view of an epistemologically correct theoretical scheme, to what extent this scheme itself is now formed in the methodology of pedagogy and what are the immediate prospects for such formation. The aim of the article is to reveal the epistemological coding of the modern state of educational theory as an object of research reflection and the prospects for its further formation. Materials and Methods. Among our research methods, we consider it possible to include: analysis of literature on the topic of the work, a theoretical substantive generalization, heuristic synthesis, the formulation of a hypothesis about the possible content and activity filling the field of reflection of researchers in the field of pedagogy, and a prospectus of further approaches to the study of the problem. Results. The modern initial stage of the theoretical interpretation of pedagogy is identified, the difficulties of which are explained by the polyphony of coding: the object of pedagogy, its fundamental foundations, the rules for deducing consequences from general provisions, the correct implementation of generalizations and analogies, and the methods for carrying out the experiment and identifying experimental confirmation of an experted theory. As the nearest stage in the solution of these problems, the authors design correct theoretical constructs of a restricted nature which must include the following aspects: identifying weak research development of several segments of pedagogical reality, raising hypotheses about the possibility of describing them from the point of view of the positively valuable educational outcome for the learner and the ways of achieving it, finding the criteria for its evaluation and implementing them in a diagnostic format. Conclusions. The presented variant of polyaspect reflection of the results of educational research based on the theoretical scheme covers both retrospective and prospective reflective forms; it also shows all the procedures traditionally indicated by psychologists: stopping, removing, fixing, reviewing, objectifying; allows educational researchers to evaluate their investigations according to scientific norms which achieve a theoretical status. All the theses of the problematic format presented in the article are a possible field of application for beginning researchers.

© 2018 Media Sphera Publishing Group. All rights reserved. The objective of the present study was to elucidate the characteristic features of the injuries inflicted to the victims of a road traffic accident inside the passenger compartment of a moving car equipped with the modern personal safety systems. The materials available for the present work included the lesions documented in 210 drivers and 150 occupants of the car passenger compartments. Both comparative, morphometric and statistical methods were used to analyze the data obtained. The morphometric analysis included identification of the form of the injury, such as extravasation, wounds, fractures, and lesions of the internal organs (e.g. hemorrhages, ruptures, etc.), their number and localization. Special attention was given to the specific features of the injuries to the occupants of the cars equipped with the modern personal safety systems. The study has demonstrated that the form, frequency, and localization of the injuries inflicted to the victims of a road traffic accident inside the passenger car compartment (including the drivers and other occupants) can be used for determining the positions of the victims at the moment of the accident.

© 2018 Media Sphera Publishing Group. All rights reserved. The objective of the present study was to determine the biological age of the unidentified dead subjects based on the morphometric characteristics of the sella turcica in comparison with other methods available for the purpose in order to narrow the range of the alleged ages of the human remains being examined. The parameters of the sella turcica were measured in the corpses immediately after cephalotomy provided no pathological changes could be identified in the sellar region. A total of 86 skulls of the Caucasoid subjects representing the Eastern-Slavic group at the age varying from 22 to 87 years were available for the examination. The study has demonstrated the undulating dynamics of dimensional characteristics of the sellae turcica during the course of a lifetime. The regression analysis was employed to predict the age of the subjects above 22 years of age based on the measurements of the length and depth of the sella turcica and to classify the sample of interest within a given age period. It is concluded that the morphometric characteristics of the sells turcica can be used as the additional clues for the purpose of age determination in forensic medical investigations.

© 2018 by the authors. The article contains the results of an empirical study on self-perception and cognitive style of students. The issue of what psychological variables accompany the process of interpersonal interaction in small groups is considered from a viewpoint of cognitive structures of individual members that comprise such groups. The article also presents a theoretical and methodological analysis of personal and cognitive features of students with different sociometric status. The novelty of this work consists in studying self-perception of group members with different sociometric status, and personal and cognitive characteristics and features given to group members through a system of their opinions about each other. It was concluded from the results of the study that the subjects with different sociometric status are perceived differently by the group: leaders appear to be more aggressive and authoritarian than outsiders. The subjects-leaders when coming across the circumstances that subjectively experienced as unpleasant ones, are able to minimize negative experience and find positive moments in such situations. The outsiders are unable to see the positive aspects of situations they subjectively experience as unpleasant. The cognitive space of the subjects-leaders includes the binary opposition construct “optimistic – pessimistic” what can be determined as cognitive complexity. While the subjects-outsiders perceive the cognitive field of the construct as a one-sided structure, and in unpleasant situations they see the surrounding reality not from the positive side, but only from the negative one. The results presented in this article can be useful to optimize interpersonal relations in student groups, as well as to be a source of additional information to develop measures of a psychological impact.

© 2018, Media Sphera Publishing Group. All rights reserved. The objective of the present study was the criminalistics evaluation of the changes in the structure of the illegal drug market and the volume of drug sales that took place during the recent years. One of the most challenging problems associated with the new situation is the extensive distribution of synthetic cannabimimetics that constitutes one of the most serious threats to the public security. The criminological analysis of the forensic expert practice provided materials for the criminalistics characteristic of the recent events at the criminal drug market in several regions of this country as of 2014 with special reference to the cases of mass poisoning of the young people attributable to the use of the new psychoactive agents. The authors emphasize the important role of forensic medical and other forensic expertises for the identification and comprehensive evaluation of all the factors and circumstances associated with the current situation and characterizing the level of social unsafety under the conditions of the illegal trafficking of the new psychoactive substances. It is concluded that the further improvement of the criminal legislation is urgently needed to strengthen the responsibility for the participation in the subversive and terrorist activities.