Phase equilibria and thermodynamic properties of oxide systems on the basis of rare earth, alkaline earth and 3d-transition (Mn, Fe, Co) metals. A short overview of

Review is dedicated studies of phase equilibria in the systems based on rare earth elements and 3d transition metals. It’s highlighted several structural families of these compounds and is shown that many were found interesting properties for practical application, such as high conductivity up to the superconducting state, magnetic properties, catalytic activity of the processes of afterburning of exhaust gases, the high mobility in the oxygen sublattice and more

Prompt neutrino fluxes from atmospheric charm

We calculate the prompt neutrino flux from atmospheric charm production by cosmic rays, using the dipole picture in a perturbative QCD framework, which incorporates the parton saturation effects present at high energies. We compare our results with the next-to-leading order perturbative QCD result and find that saturation effects are large for neutrino energies above 10^6 GeV, leading to a substantial suppression of the prompt neutrino flux. We comment on the range of prompt neutrino fluxes due to theoretical uncertainties.Comment: 13 pages with 11 figures; expanded discussion, added references, version to be published in Phys. Rev.

The Results of Plant Monitoring in the Semistozhki Area of Stavropol Region

Preserving biodiversity is a global problem that was reflected in the Convention on Biological Diversity which appeared in 1992. The adoption of the Convention was an answer to the intensified problem of a significant reduction in the diversity of genetic resources. Botanical gardens are the main centres for preserving the biodiversity of plants that solve the problem of preserving the gene pool. One of the main tasks of botanical gardens is to monitor plant populations in their natural habitats in situ. This paper describes the monitoring of the current state of peonies and sedges in the Semistozhki area of the Andropov district in the Stavropol region. The research determines the growing locations and the belongingness of species to plant associations in the vegetation variety of the Stavropol region. It also determines the species that may be treated as rare due to their limited distribution area. The territory is marked by the presence of Paeonia tenuifolia L., which is a tertiary relict, and Paeonia biebersteiniana Rupr., which is subendimic for Stavropol region. Rear species with low numbers that are not threatened by grave danger of extinction are also present. Carex hordeistichos Vill. and c. otrubae Podp. species in the area are small in number. Their populations in the area are inadequate with young, vegetative and strong specimens lacking. The limiting factors are represented by human agricultural activities. Several specimens of a narrow-leaved peony of pink colour and a big number of petals were planted on an experimental stretch of the botanical garden to continue the analysis ex-situ

Highly mobile carriers in orthorhombic phases of iron-based superconductors FeSe1−x{}_{1-x}Sx{}_{x}

The field and temperature dependencies of the longitudinal and Hall resistivity have been measured for FeSe${}_{1-x}$S${}_{x}$ (x=0.04, 0.09 and 0.19) single crystals. The sample FeSe${}_{0.81}$S${}_{0.19}$ does not show a transition to an orthorhombic phase and exhibits at low temperatures the transport properties quite different from those of orthorhombic samples. The behavior of FeSe${}_{0.81}$S${}_{0.19}$ is well described by the simple two band model with comparable values of hole and electron mobility. In particular, at low temperatures the transverse resistance shows a linear field dependence, the magnetoresistance follow a quadratic field dependence and obeys to Kohler's rule. In contrast, Kohler's rule is strongly violated for samples having an orthorhombic low temperature structure. However, the transport properties of the orthorhombic samples can be satisfactory described by the three band model with the pair of almost equivalent to the tetragonal sample hole and electron bands, supplemented with the highly mobile electron band which has two order smaller carrier number. Therefore, the peculiarity of the low temperature transport properties of the orthorhombic Fe(SeS) samples, as probably of many other orthorhombic iron superconductors, is due to the presence of a small number of highly mobile carriers which originate from the local regions of the Fermi surface, presumably, nearby the Van Hove singularity points

Self-oscillations in rocks,results of laboratory experiments

The method of generation of self-oscillations in rocks is developed here. Self-oscillations arise as a result of direct and inverse mechanoelectric transformations without an external generator. Laboratory experiments were executed with different samples. A relation between self-oscillation parameters from samples humidity and direct electrical field applied to samples was detected

Magnetotransport properties of FeSe in fields up to 50T

Magnetotransport properties of the high-quality FeSe crystal, measured in a wide temperature range and in magnetic fields up to 50 T, show the symmetry of the main holelike and electronlike bands in this compound. In addition to the main two bands, there is also a tiny, highly mobile, electronlike band which is responsible for the non-linear behavior of $\rho_{xy}$(B) at low temperatures and some other peculiarities of FeSe. We observe the inversion of the $\rho_{xx}$ temperature coeficient at a magnetic field higher than about 20 T which is an implicit conformation of the electron-hole symmetry in the main bands.Comment: MISM 201

Personal characteristics of a 21st-century teacher: An analysis of empirical studies of the problem

Introduction. Modern scientific literature lacks evidence-based empirical studies of teacher personality. Singular reviews of the empirical studies related to the teacher personality are fulfilled within the framework of one theoretical model and do not cover results obtained in other directions of research, which does not benefit the practice of modern educational managers, teachers or educational psychologists. This gap might be filled with generalising empirical evidence through analysing international publications on personality of the modern teacher. Aim. The article aims to review empirical studies dedicated to the characteristics of a 21st-century teacher, to understand the existing limitations in the research of teacher personality, and to outline future research directions for the optimisation of today’s educational practice. Methods. The review includes the publications selected with searching keywords along with additional descriptors, followed by the analysis of content of relevant publications. The review covers articles published in the last 20 years. Results. The results of empirical studies, which meet the research selection criteria (have representative volumes of research samples and performed using measuring tools with known psychometric properties), allowed the author to distinguish several main clusters for studying teacher personal characteristics. The most prevalent are the studies of teacher personality within the five-factor framework, teacher emotional intelligence and motivation (job motivation, intrinsic motivation and semantic preferences). Within these clusters, the author has identified the tendencies, which demonstrate personal characteristics of a 21st-century teacher and correspond to subjective paradigm of modern education, effective teaching and effective management of education processes. Scientific novelty. The generalisation of results allowed the author to determine the basic personality characteristics of the modern teacher. The presented results reveal the patterns of personality development, work behaviour of a modern teacher and can serve as the basis for further research in the field of educational sciences, personality psychology, labour psychology and educational psychology. Practical significance. The specific historical knowledge about personal characteristics of a 21st-century teacher may serve for strategic and tactical decisions in the field of education management; determine the tactics of managing modern teaching staff; design teacher-centric programmes for the educational psychological services and educational programmes for the training, retraining and advanced training of teachers.Введение. В научной литературе эмпирические исследования личностных особенностей современного учителя с опорой на надежные и валидные методики немногочисленны. Единичные обзоры эмпирических исследований личности учителя выполнены только в рамках одной теоретической модели и не учитывают достижения других научных направлений, что существенно снижает потенциал управленческой, педагоги ческой и психологической деятельности в современном образовании. Разрешению этого противоречия может способствовать обзор эмпирических исследований, представляющий собой анализ и обобщение международного опыта изучения личностных особенностей со временного учителя. Цель. На основе анализа научных публикаций обобщить результаты эмпирических исследований личностных особенностей учителя начала XXI века, выявить основные ограничения в организации научных исследований личностных особенностей учителя и определить актуальные направления исследований для оптимизации педагогической деятельности в современных условиях. Методология и методы. В обзоре использовалась методология подготовки аналитических обзоров на основе поиска публикаций с опорой на ключевые слова, в соответствии с выбранными критериями поиска с использованием дополнительных дескрипторов и дальнейшего качественного анализа релевантных эмпирических исследований. В обзоре использовались материалы, опубликованные за последние 20 лет. Результаты. Результаты эмпирических исследований, которые имеют репрезентативные объемы исследовательских выборок, выполненные с применением измерительных инструментов с известными психометрическими свойствами и отвечающие исследовательским критериям отбора, позволяют выделить несколько основных кластеров изучения личностных особенностей учителя. Наибольшее распространение получили исследования личностных черт педагога в рамках пятифакторной модели личности, эмоционального интеллекта учителя и мотивации учителя (трудовой мотивации, внутренней мотивации, эмоционально-смысловых предпочтений). Внутри этих кластеров были выявлены тенденции, которые характеризуют личностные особенности учителя XXI века, отвечающие возможности воплощения субъектной парадигмы современного образования, задаче успешного выполнения учителем своей деятельности и эффективности управления образовательными процессами. Научная новизна. Обобщение результатов определило содержание базовых личностных характеристик современного учителя и позволило выявить особенности, отличающие учителя XXI века. Представленные результаты раскрывают закономерности развития личности, поведения и деятельности современного учителя и могут выступить основой для дальнейших исследований в сфере наук об образовании, психологии личности, психологии труда и педагогической психологии. Практическая значимость. Конкретно-историческое знание личностных особенностей учителя XXI века представляет собой доказательную базу для выработки стратегических и тактических решений в сфере управления образованием; определяет тактику управления современными педагогическими коллективами; позволяет проектировать на правления работы психологической службы системы образования с учителем, а также служит материалом для разработки образовательных программ подготовки, переподготовки и повышения квалификации учителей.Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 20-113-50085The reported study was funded by the Russian Foundation for Basic Research (RFBR), project number 20-113-50085