Nonfrustrated magnetoelectric with incommensurate magnetic order in magnetic field

We discuss a model nonfrustrated magnetoelectric in which strong enough magnetoelectric coupling produces incommensurate magnetic order leading to ferroelectricity. Properties of the magnetoelectric in magnetic field directed perpendicular to wave vector describing the spin helix are considered in detail. Analysis of classical energy shows that in contrast to naive expectation the onset of ferroelectricity takes place at a field $H_{c1}$ that is lower than the saturation field $H_{c2}$. One has $H_{c1}=H_{c2}$ at strong enough magnetoelectric coupling. We show that at H=0 the ferroelectricity appears at $T=T_{FE}<T_N$. Qualitative discussion of phase diagram in $H-T$ plane is presented within mean field approach.Comment: 12 pages, 3 figures, accepted in JET

Bose-Einstein condensation of magnons in magnets with predominant ferromagnetic interaction

We discuss Bose-Einstein condensation of magnons (BEC) in magnets with predominant ferromagnetic (FM) interaction in magnetic field $H$ near saturation ($H_c$). Because $H_c$ is independent of FM couplings, magnetic materials of this type can have small $H_c$ that makes them promising candidates for experimental investigation of BEC. Ferromagnets with easy-plane anisotropy and antiferromagnets (AFs) containing weakly coupled FM planes or chains are discussed in detail. We observe small effective interaction between magnons near the QCP in such magnets, in contrast to AFs with strong AF coupling previously discussed. In particular, this smallness allows us to find crossovers in the critical temperature $T_c(H)\propto (H_c-H)^{1/\phi}$ from $\phi=3/2$ to $\phi=1$ in quasi-1D magnets, and from $\phi=3/2$ to $\phi\approx1$ ($T_c\ln T_c\propto H_c-H$) in quasi-2D ones.Comment: 9 pages, 4 figure. The paper has been rewritten considerably. In particular, discussion of crossovers in the critical temperature in quasi-low-dimensional magnets is adde

About assessment of training in competency-based education model

In article the questions of an assessment of results of training in education competence-based model are considered.В статье рассматриваются вопросы оценки результатов обучения в компетентностной модели образования

Modern education techniques: inverted training (experience)

В статье авторы рассматривают практический опыт применения метода перевернутого обучения. Показаны основные изменения в сфере высшего образования.In this article the experience of applying the method of inverted training is examined. The basic changes in the field of higher education are shown

Substantiation of the Parameters of a Soil Tillage Machine Ripper

Introduction. Production of safe food requires the avoidance of using chemical means to bring weeds under control in cultivating crops. Existing tillage loosening and separating machine PRSM-5 Dokuchaevskaya optimizes the physical and mechanical state of the cultivated soil layer, while the weeds are carefully removed from the soil by combing out together with the whole weed root system and laid on the surface, where they dry up under the influence of climatic factors. During the operation of the tillage machine, about 30% of the total energy consumption is spent on the rotor drive. Therefore, this machine is not working satisfactorily in firm soils. Materials and Methods. The soil was considered as an elastic-plastic medium. The generalized Hookeʼs law model and a variant of the plastic flow theory were taken into account. To simplify the calculations, there was used the experimental study information on the position in space of the soil deformation surface. The intensity of stresses of polyplastic deformations of the soil layer was determined. For the numerical solution of the problem, the Ritz method was used. Results. In connection with the indicated disadvantages, the parameters of the rotor ripper are justified taking into account the reduction in energy consumption for its drive. As a result of solving the problem by the Ritz method, the geometric shape of the rotor ripper was determined. The energy performance of the section of the tillage machine was evaluated by the torque of the rotor drive of the loosening-separating device. The rotor drive torque was determined for rippers with flat, convex, and concave profiles and for the profile substantiated during the study. Discussion and Conclusion. The profile substantiated during the study provides the best conditions for transporting the soil at the initial moment of the rotor entry into the soil and the minimum energy consumption for its drive

Показатели качества работы почвообрабатывающей рыхлительно-сепарирующей машины

Pre-­sowing soil cultivation aims at forming such a soil structure, which will allow increasing the yield. (Research purpose) To determine the qualitative indicators of an experimental soil­cultivating ripping­-and-­separating rotary machine for optimizing the ploughed soil layer, modifying the structure and density of the cultivated soil layer in accordance with the agronomic requirements. (Materials and methods) The author has studied physical and mechanical properties of the soil after its spring cultivation in the conditions of bare (black) fallow. Soil structure and aggregate composition depending on the type of cultivation, the density of soil layers at different times, the dynamics of soil moisture changes in the layers for two months after its spring cultivation have been analyzed as well. (Results and discussion) The author has studied the operation of a soil tillage ripping-­and-­separating machine on the soil layer, which is separated after processing into four sublayers: over­-seed, seed, under-­seed and subsurface ones. Soil fragments (lumps) of a size larger than 20 mm have been completely removed from the over-­seed sublayer. The most valuable soil structure in agronomic terms is formed in the seed sublayer, where the size of individual components does not exceed three times the size of seeds, the density of the under-­seed sublayer is up to 1.25 grams per cubic centimeter. The subsurface sublayer has a density of not more than 1.3 grams per cubic centimeter and a hardness of more than 3 MPa in the plow sole, which is provided by the main tillage operations. The information for the study has been obtained as a result of the analysis of literary sources. (Conclusion) The experimental machine for optimizing the agrophysical properties of the ploughed soil layer allows increasing the structural coefficient by about 2.5 times as compared with traditional cultivators. It has been found that soil cultivation with a ripping-­and-­separating tillage machine allows to improve the methods of pre-­sowing cultivation to improve its agrotechnical characteristics, skip pre­-sowing harrowing and cultivation and prepare the soil for sowing in one run.Предпосевная обработка почвы предусматривает создание структуры, которая позволит повысить урожайность. (Цель исследований) Определить качественные показатели экспериментальной почвообрабатывающей роторной рыхлительно-­сепарирующей машины для оптимизации пахотного слоя почвы, изменяющей структуру и плотность обрабатываемого слоя почвы в соответствии с требованиями агрономической науки. (Материалы и методы) Изучили в полевых условиях физико­-механические свойства почвы после весенней обработки ее в условиях черного пара. Проанализировали структурно­-агрегатный состав почвы в зависимости от вида обработки, плотность сложения почвы по слоям в различные сроки, динамику изменения влажности почвы по слоям на протяжении двух месяцев после ее весенней обработки. (Результаты и обсуждение) Проведены исследования почвообрабатывающей рыхлительно-­сепарирующей машины на слое почвы, который после обработки расслаивается на четыре подслоя: надсеменной, семенной, подсеменной и подпахотный. Из надсеменного подслоя полностью удалены глыбистые фрагменты почвы размером более 20 миллиметров. В семенном – образуется наиболее ценная в агрономическом отношении структура почвы, размер отдельных компонентов которой не превышает 3-­кратный размер семян, плотность сложения подсеменного до 1,25 грамм на кубический сантиметр. Подпахотный подслой имеет плотность не выше 1,3 грамм на кубический сантиметр и твердость в плужной подошве – более 3 мегапаскалей, что обеспечивается основной обработкой. Информация для обоснования исследования получена в результате анализа литературных источников. (Выводы) Экспериментальная машина для оптимизации агрофизических свойств пахотного слоя почвы позволила повысить коэффициент структурности примерно в 2,5 раза, в сравнении с традиционными культиваторами. Выявили, что обработка почвы с использованием почвообрабатывающей рыхлительно-­сепарирующей машины позволяет усовершенствовать методы предпосевной обработки почвы для улучшения ее агротехнических качеств, исключить предпосевное боронование и культивацию и осуществить подготовку почвы к посеву за один проход

Evaluating the use of the Child and Adolescent Intellectual Disability Screening Questionnaire (CAIDS-Q) to estimate IQ in children with low intellectual ability

In situations where completing a full intellectual assessment is not possible or desirable the clinician or researcher may require an alternative means of accurately estimating intellectual functioning. There has been limited research in the use of proxy IQ measures in children with an intellectual disability or low IQ. The present study aimed to provide a means of converting total scores from a screening tool (the Child and Adolescent Intellectual Disability Screening Questionnaire: CAIDS-Q) to an estimated IQ. A series of linear regression analyses were conducted on data from 428 children and young people referred to clinical services, where FSIQ was predicted from CAIDS-Q total scores. Analyses were conducted for three age groups between ages 6 and 18 years. The study presents a conversion table for converting CAIDS-Q total scores to estimates of FSIQ, with corresponding 95% prediction intervals to allow the clinician or researcher to estimate FSIQ scores from CAIDS-Q total scores. It is emphasised that, while this conversion may offer a quick means of estimating intellectual functioning in children with a below average IQ, it should be used with caution, especially in children aged between 6 and 8 years old

Practical Strategies to Improve National Competitiveness

Today, the global community is faced with a new vision of the economy that aims to coordinate public policies with the purpose of ensuring sustainable growth to facilitate economic recovery under the current conditions and after the COVID-19 pandemic. The purpose of the study is to create a basic typology of strategies to improve national competitiveness in the context of globalization. The research methodology includes a comparison of economic development models and strategies for different countries around the world and an analysis of data from international organizations. The benchmarking of national strategies is based on the measurements’ evaluation for three groups of the GCI index components. The originality of the study stems from the fact that it proposed choosing a strategy for the development of the national economy with account taken of the level of its economic development. The strengths and weaknesses of competitiveness in the profile of the economy are identified and, whereby, a strategy to increase national competitiveness is chosen, according to the results of this analysis. The results of the study showed that the American model of economic development is the most competitive one among the examined models. In addition, the paper shows that the application of practical strategies for social integration, as well as mergers and acquisitions, will contribute to enhancing the national competitiveness in the context of economic growth and raising the living standards of the population. The findings of this research provide practical guidance for related professionals attempting to choose a suitable public policy to form effective and holistic national strategies and monitor the country’s progress over time. © The Author(s) 2021

STRATEGIC DEVELOPMENT MANAGEMENT OF AN AGRICULTURE-ORIENTED REGION BY THE CLUSTER APPROACH: CASE OF REGIONS IN THE SOUTH OF RUSSIA

: The relevance of this study comes from the fact that the spatial organization of economy in Russia’s regions is going through the definite crisis in the established patterns of territorial localization and operation of the leading branches of economy and their anchor loci. The absence of any efficient response to this crisis results in increased disruption, excessive polarization, and socioeconomic asymmetry of economic space. Regions with agriculture-oriented economy are more sensitive to the uneven development of economic space because they are more dependent on natural and geographical determinants, whereas the focused development of particular zones leads to synchronously formed depressive localities with low basic socioeconomic parameters, despite available resource potential. From this perspective, this article aims to form new approaches to organizing economic space of agriculture-oriented regions, which must be dovetailed with revealing all propulsive economy sectors, zonal and polar forms of economic growth, followed by introduction of various kinds of cluster innovations based on encouraging respective initiatives. The potential of cluster forms of economic space organization is the one that can be spread to vast neighboring territories to form network structures characterized by active socioeconomic development. The modern theoretical methodological basis for managing agriculture-oriented regions by the cluster approach is characterized by deficiency and non-contiguous elaboration of questions related to identifying clusters and their formative prerequisites, making use of particularities and effects of various phases of their lifecycle to improve parameters of socioeconomic territorial development. In addition, there are no advanced developments in polybranch clusterization of economy with the formation of clusterized network economic space. The methodological tools for monitoring and diagnosing cluster formation processes are insufficient. The most efficient method of solving the above specified problem is to form a specialized methodological approach to revealing cluster formation prospects in propulsive sectors of economy. The approach must rely on forming an author system of indices and the expert survey technique. The initiating factor of this study was the theoretical, methodological, and practical pendency of these and many other questions related to the diffusion of cluster innovations in agriculture-oriented regions. The article discloses the essence of the methodological approach to revealing cluster formation prospects in propulsive economic sectors of an agriculture-oriented region. The described method involves calculating nine indices that provide the complete characteristic of the cluster formation capacity on the basis of a particular branch; in the end, this helps formulate the immanent characteristics of the economic sectors of the Stavropol’ kray in the context of cluster formation prospects