Estimation of the solar wind extreme events

This research provides an analysis of extreme events in the solar wind and in the magnetosphere due to disturbances of the solar wind. Extreme value theory has been applied to a 20-year data set from the Advanced Composition Explorer spacecraft for the period 1998–2017. The solar proton speed, solar proton temperature, solar proton density, and magnetic field have been analyzed to characterize extreme events in the solar wind. The solar wind electric field, vBz has been analyzed to characterize the impact from extreme disturbances in the solar wind to the magnetosphere. These extreme values were estimated for 1-in-40- and 1-in-80-year events, which represent two and four times the range of the original data set. The estimated values were verified in comparison with measured values of extreme events recorded in previous years. Finally, our research also suggests the presence of an upper boundary in the magnitudes under study.Ministerio de Economía y CompetitividadAgencia Estatal de Investigació

Specific features of magnetic structure formation in orbitally degenerate BiMnO3 manganite

The orbital structure and magnetic ordering of the Jahn-Teller multiferroic BiMnO3 manganite have been theoretically studied. It is shown that the orbital structure depends not only on the nearest-neighbor oxygen environment of manganese ions, but also on their next-to-nearest neighbors. The orbital structure significantly influences the magnetic order that forms as a result of competition between ferromagnetic and antiferromagnetic exchange interactions. © 2013 Pleiades Publishing, Ltd

The mechanism of antidepressant action of a new 3-substituted thiethane-1,1-dioxide derivative in tests of neuropharmacological interaction

The present study is aimed at investigation of the mechanism of action of a new 3-substituted thietane-1,1-dioxide derivative (N-199/1) exhibiting antidepressant properties, in several tests of neuropharmacological interactio

Podobe države in stereotipi, ki jih o Rusiji gojijo učenci ruskega jezika (Country Images and Stereotypes about Russia Held by Russian Language Learners)

This article explores country images and stereotypes about Russia held by Russian language learners in a big public university in Malaysia. Several studies in the field of applied linguistics have explored language learners’ stereotypes about the target language country. However, there are some gaps in the academic literature on this topic. Firstly, no studies have been done among the learners of the Russian language; secondly, a systematic analysis of cultural stereotypes held by language learners has been lacking. The present study adopts an interdisciplinary approach to address these gaps. It explores the internal structure of the students’ images about Russia, examines the stereotypical images about the country and quantitatively assesses favourability of these stereotypes. The findings show that the images about Russia held by the students clustered around several country-related aspects. Several prominent stereotypes about Russia were distinguished and the majority of these stereotypes were positive. The article concludes with a brief discussion on practical implications of these findings

A look at a small classroom in a big university: through a Metaphor, Vividly

In educational research literature there are two influential metaphors about learning. They describe this process as either “acquisition” or “participation” (Sfard, 1998). These metaphors have been widely used by scholars, researchers and educators. However, the students’ perspectives on learning have been underexplored. This article addresses this gap in research literature and examines metaphors about learning created by a group of foreign language learners in a big public university in East Malaysia. The findings indicate universality of people’s perceptions about learning and reveal the presence of both the “acquisition” and “participation” metaphors in the students’ images. The study considers the implications of the findings for language pedagogy

Escape from an optoelectronic tweezer trap: experimental results and simulations

Optoelectronic tweezers (OET) are a microsystem actuation technology capable of moving microparticles at mm s−1 velocities with nN forces. In this work, we analyze the behavior of particles manipulated by negative dielectrophoresis (DEP) forces in an OET trap. A user-friendly computer interface was developed to generate a circular rotating light pattern to control the movement of the particles, allowing their force profiles to be conveniently measured. Three-dimensional simulations were carried out to clarify the experimental results, and the DEP forces acting on the particles were simulated by integrating the Maxwell stress tensor. The simulations matched the experimental results and enabled the determination of a new “hopping” mechanism for particle-escape from the trap. As indicated by the simulations, there exists a vertical DEP force at the edge of the light pattern that pushes up particles to a region with a smaller horizontal DEP force. We propose that this phenomenon will be important to consider for the design of OET micromanipulation experiments for a wide range of applications