High pressure synthesis of FeO-ZnO solid solutions with rock salt structure: in situ X-ray diffraction studies

X-ray diffraction with synchrotron radiation has been used for the first time to study chemical interaction in the FeO-ZnO system at 4.8 GPa and temperatures up to 1300 K. Above 750 K, the chemical reaction between FeO and ZnO has been observed that resulted in the formation of rock salt (rs) Fe1-xZnxO solid solutions (0.3 \leq x \leq 0.85). The lattice parameters of these solid solutions have been in situ measured as a function of temperature under pressure, and corresponding thermal expansion coefficients have been calculated.Comment: 9 pages, 2 figures, 1 tabl

Tecnología para la formación temprana de resistencia al estrés en el sistema de prevención de la mala adaptación escolar de alumnos de primer grado

The relevance of the stated problem of the crisis of 6-7-year old’s is dictated by the recently growing tendency to bring back children to preschool institutions after a short period at school by parents who notice the child’s painful condition associated with school maladaptation. In this regard, many researchers and practicing educators recommend reviewing the start dates for children at school so that the child starts school at the age of seven. Other teachers notice a significant increase in the work load on primary schoolchildren connected to the introduction of the Federal State Educational Standard for Primary General Education and the corresponding forms of control and assessment activities. Thus, there was a need to develop new technologies to preserve the health of younger students and allow them to overcome the crisis of the onset of education. The purpose of this article is to describe the developed technology aimed at helping 6-7-year old to overcome the age crisis and prevent school maladaptation with the help of early formation of stress tolerance. The main method in the study is the design of a technology for early formation of stress tolerance and prediction of the results of its implementation in the experimental groups of 6-7-year-old children. The technology is based on the principles of continuity of the educational process between preschool educational organizations and schools. With the implementation of the developed technology the following results were achieved: increased motivation for success and higher somatic health level manifested in sport and creative activities. The above-mentioned results in their turn contributed to crisis prevention, school deprivation of first graders and comfortable overcoming of the crisis of 6-7 year olds. The materials of the article can be useful to organizers of sport and creative activities in preschool educational institutions, educators of preparatory groups, teachers, methodologists in preschool and primary education, as well as physical education teachers and primary school teachers. The materials of the article can be used in the system of advanced training of teachers of physical education and elementary school, as well as in the preparation for professional activities in preschool educational institutions and elementary schools of students of teacher training colleges and universities.La relevancia del problema declarado de la crisis de los niños de 6 a 7 años está dictada por la tendencia cada vez mayor de traer a los niños a las instituciones preescolares después de un corto período en la escuela por parte de los padres que notan la condición dolorosa del niño asociada con la mala adaptación escolar. En este sentido, muchos investigadores y educadores en ejercicio recomiendan revisar las fechas de inicio de los niños en la escuela para que el niño comience la escuela a la edad de siete años. Otros maestros notan un aumento significativo en la carga de trabajo de los escolares de primaria relacionados con la introducción del Estándar Educativo del Estado Federal para la Educación General Primaria y las formas correspondientes de actividades de control y evaluación. Por lo tanto, era necesario desarrollar nuevas tecnologías para preservar la salud de los estudiantes más jóvenes y permitirles superar la crisis del inicio de la educación. El propósito del artículo es describir la tecnología desarrollada destinada a ayudar a niños de 6 a 7 años a superar la crisis de la edad y prevenir la mala adaptación escolar con la ayuda de la formación temprana de tolerancia al estrés. El método principal en el estudio es el diseño de una tecnología para la formación temprana de tolerancia al estrés y la predicción de los resultados de su implementación en los grupos experimentales de niños de 6-7 años. La tecnología se basa en los principios de continuidad del proceso educativo entre las organizaciones educativas preescolares y las escuelas. Con la implementación de la tecnología desarrollada se lograron los siguientes resultados: mayor motivación para el éxito y un mayor nivel de salud somática manifestado en actividades deportivas y creativas. Los resultados mencionados a su vez contribuyeron a la prevención de crisis, la privación escolar de los alumnos de primer grado y la superación cómoda de la crisis de los niños de 6 a 7 años. Los materiales del artículo pueden ser útiles para los organizadores de actividades deportivas y creativas en instituciones educativas preescolares, educadores de grupos preparatorios, maestros, metodólogos en educación preescolar y primaria, así como maestros de educación física y maestros de primaria. Los materiales del artículo se pueden utilizar en el sistema de formación avanzada de docentes de educación física y primaria, así como en la preparación de actividades profesionales en instituciones educativas preescolares y escuelas primarias de estudiantes de escuelas de formación de docentes y universidades

Youth Leisure in Cultural Space of Modern City: State and Prospects of Development

The relevance of this article is the need to study the leisure sphere of modern youth, since free time is one of the important means of forming a young person's personality. The use of free time by young people is a kind of indicator of culture, the range of spiritual needs and interests of a particular personality of a young person. The aim of the study is to analyze the strategy of youth leisure in the cultural space of the modern city. Research methods: as a research method, we used the questionnaire method, which allows us to analyze in detail the main forms and dynamics of the development of modern youth’s leisure practices living in an urban environment. Results of the research: the article considers the problems and prospects of leisure strategies’ development of young people living in the city. The features of organizing youth leisure in the city are described. The preferences of young people in leisure activities are revealed. The degree of satisfaction of young people with forms of leisure is analyzed. The article considers the respondents' awareness of the work of institutions of the social and cultural sphere in organizing leisure activities for young people in the city. The reasons that prevent young people from spending leisure time in accordance with their needs are identified. Alternative forms of leisure activities are considered. The novelty and originality of the study lies in the fact that for the first time the reasons why young people do not have the opportunity to build their leisure strategy in accordance with their needs are investigated: external reasons (lack of places, disinterest of organizers, certain forms of leisure are unattractive or unprofitable for entrepreneurs); internal reasons (strong employment at work, lack of energy after work, laziness). The reasons for the lack of interaction of young people with leisure and cultural organizations (lack of time; ignorance of where to address on this issue; unwillingness of the organizers to change the situation that is, ignoring the position of young people) are determined. It is revealed that young people show little interest in leisure activities organized by the authorities, since they are formal in nature and do not correspond to the leisure preferences of young people. For the first time, the main strategies for leisure activities for young people living in the city (meetings with friends, relatives, walks, computer games, viewing content, relaxing in silence, and reading) were identified. The strategies of leisure activities that are used to a lesser extent (visiting the cinema, theater; active recreation (Cycling, skating, various sports); attending concerts, exhibitions, master classes; learning foreign languages) are considered. It is revealed that young people are not satisfied with the available leisure opportunities in the city. The reasons for discontent are determined (limited material resources in the city for interesting forms of leisure; lack of cultural and leisure institutions in the city that would meet the requirements of young people; limited choice of institutions where you can spend your free time). There is a gap between the needs of young people in the field of leisure and the activities of the city's youth policy Department, which conducts events according to its own plan, without taking into account the opinion of young people. Young people's knowledge about events is examined and the problem is determined about unawareness of cultural and entertainment events that are associated with the lack of interest of young people and lack of desire of the organizers of the Department of culture to find out what interests this age group. Alternative forms of leisure that young people would like to see in the urban environment, as well as take part in them, are identified (such as cinemas, theaters, restaurants; amusement parks, attractions, water parks, bowling; master classes, courses, exhibitions; interest clubs (language, discussion, computer); Bicycle rental, roller skates, Quad bikes, go-karts; paragliding school; industrial tourism). Practical significance: the data Obtained in this work can be used in social psychology, pedagogy, age psychology, as well as for further theoretical development of this issue

Electron-based crystalline undulator

We discuss the features of a crystalline undulator of the novel type based on the effect of a planar channeling of ultra-relativistic electrons in a periodically bent crystals. It is demonstrated that an electron-based undulator is feasible in the tens of GeV range of the beam energies, which is noticeably higher than the energy interval allowed in a positron-based undulator. Numerical analysis of the main parameters of the undulator as well as the characteristics of the emitted undulator radiation is carried out for 20 and 50 GeV electrons channeling in diamond and silicon crystals along the (111) crystallographic planes.Comment: 16 pages, 8 figures, Latex, IOP styl

Chiral photonic super-crystals based on helical van der Waals homostructures

Chirality is probably the most mysterious among all symmetry transformations. Very readily broken in biological systems, it is practically absent in naturally occurring inorganic materials and is very challenging to create artificially. Chiral optical wavefronts are often used for the identification, control and discrimination of left- and right-handed biological and other molecules. Thus, it is crucially important to create materials capable of chiral interaction with light, which would allow one to assign arbitrary chiral properties to a light field. In this paper, we utilized van der Waals technology to assemble helical homostructures with chiral properties (e. g. circular dichroism). Because of the large range of van der Waals materials available such helical homostructures can be assigned with very flexible optical properties. We demonstrate our approach by creating helical homostructures based on multilayer As$_2$S$_3$, which offers the most pronounced chiral properties even in thin structures due to its strong biaxial optically anisotropy. Our work showcases that the chirality of an electromagnetic system may emerge at an intermediate level between the molecular and the mesoscopic one due to the tailored arrangement of non-chiral layers of van der Waals crystals and without additional patterning

Cytogenomic Profile of Uterine Leiomyoma: In Vivo vs. In Vitro Comparison

We performed a comparative cytogenomic analysis of cultured and uncultured uterine leiomyoma (UL) samples. The experimental approach included karyotyping, aCGH, verification of the detected chromosomal abnormalities by metaphase and interphase FISH, MED12 mutation analysis and telomere measurement by Q-FISH. An abnormal karyotype was detected in 12 out of 32 cultured UL samples. In five karyotypically abnormal ULs, MED12 mutations were found. The chromosomal abnormalities in ULs were present mostly by complex rearrangements, including chromothripsis. In both karyotypically normal and abnormal ULs, telomeres were ~40% shorter than in the corresponding myometrium, being possibly prerequisite to chromosomal rearrangements. The uncultured samples of six karyotypically abnormal ULs were checked for the detected chromosomal abnormalities through interphase FISH with individually designed DNA probe sets. All chromosomal abnormalities detected in cultured ULs were found in corresponding uncultured samples. In all tumors, clonal spectra were present by the karyotypically abnormal cell clone/clones which coexisted with karyotypically normal ones, suggesting that chromosomal abnormalities acted as drivers, rather than triggers, of the neoplastic process. In vitro propagation did not cause any changes in the spectrum of the cell clones, but altered their ratio compared to uncultured sample. The alterations were unique for every UL. Compared to its uncultured counterpart, the frequency of chromosomally abnormal cells in the cultured sample was higher in some ULs and lower in others. To summarize, ULs are characterized by both inter- and intratumor genetic heterogeneity. Regardless of its MED12 status, a tumor may be comprised of clones with and without chromosomal abnormalities. In contrast to the clonal spectrum, which is unique and constant for each UL, the clonal frequency demonstrates up or down shifts under in vitro conditions, most probably determined by the unequal ability of cells with different genetic aberrations to exist outside the body