Scaling of the Fano effect of the in-plane Fe-As phonon and the superconducting critical temperature in Ba1−x_{1-x}Kx_{x}Fe2_{2}As2_{2}

By means of infrared spectroscopy we determine the temperature-doping phase diagram of the Fano effect for the in-plane Fe-As stretching mode in Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$. The Fano parameter $1/q^2$, which is a measure of the phonon coupling to the electronic particle-hole continuum, shows a remarkable sensitivity to the magnetic/structural orderings at low temperatures. More strikingly, at elevated temperatures in the paramagnetic/tetragonal state we find a linear correlation between $1/q^2$ and the superconducting critical temperature $T_c$. Based on theoretical calculations and symmetry considerations, we identify the relevant interband transitions that are coupled to the Fe-As mode. In particular, we show that a sizable $xy$ orbital component at the Fermi level is fundamental for the Fano effect and possibly also for the superconducting pairing.Comment: Supplemental materials are available upon reques

Perfectionism as a Predictor of Anxiety in Foreign Language Classrooms among Russian College Students

This study examined perfectionism as a multidimensional personality factor which influences foreign language learning and classroom anxiety. Hierarchical regression analyses confirmed that the two dimensions of perfectionism, adaptive and maladaptive, relate to Foreign Language Classroom Anxiety (FLCA) differently. After controlling for the effects of general anxiety, perceptions of academic performance, and self-reported English fluency, perfectionistic discrepancy (maladaptive aspect) was a significant predictor of FLCA; perfectionistic standards (adaptive aspect) was not. Measures indicated that this multidimensional nature of perfectionism affects Russian students in the context of foreign language classroom anxiety. Implications regarding the prevention and intervention of maladaptive perfectionism among students are discussed, as well as directions for future studies. These findings are important for teachers, students, and experts who may interact with FLCA and perfectionism as well as those who may personally experience it. The possible strategies to reduce anxiety could include discussing unrealistic beliefs and expectations with reference to foreign language learning, accepting mistakes as an integral part of foreign language learning as well as coaching

Sustainable development of a coal-mining region: technological and ecological aspects

Objective: to consider sustainable development of a region with mining as predominant economic activity through the prism of the relationship between technological and environmental aspects; to determine the impact of technological development of the coal-mining region on its sustainable development.Methods: the methods of statistical observation, summarizing and grouping of statistical observation materials, the method of analogy, as well as analytical and synthetic methods of analysis were used.Results: the level of technological development and environmental safety has a significant impact on almost all spheres of life, especially in the regions where economic growth is based on mining enterprises. In these conditions, it is of particular importance to assess the relationship between the development of the region specializing in mining, and the level of its technological and environmental development. To this end, on the basis of statistical data, the article assesses the state of technical, technological and environmental components of the coal-mining region (by the example of Kemerovo region), determines their role in improving regional competitiveness and ensuring sustainable development. The specific features and problems of coal industry technologization are revealed, the prospects of its development are determined, the experience of foreign countries is considered. It is established that the technical and technological state of the raw materials sector of Kemerovo region is a threat to regional sustainable development and does not contribute to the increase of its competitive advantages. Among the factors constraining the development of the technical and technological sphere and, as a consequence, the increase in environmental safety, are: high technological inertia of mining enterprises, low-efficiency owner, significant dependence on imports of production means, detachment of the state from the processes of withdrawal and redistribution of raw materials rent.Scientific novelty: increasing the technological level of coal industry through the creation and use of safe, environmentally friendly technologies designed to minimize environmental harm is recognized as the basis for sustainable development of a coal-mining region.Practical significance: the main provisions and conclusions can be used in the development of regional scientific, technical and environmental policies and programs of socio-economic development of territories