139 research outputs found
Foreign language teacher’s competence in using information and communication technologies
В названии статьи ошибочно указано The development o
Foreign language teacher’s competence in using information and communication technologies
В названии статьи ошибочно указано The development o
Structural features of highly stable reproducible C₆₀ fullerene aqueous colloid solution probed by various techniques
The method of preparation of highly stable reproducible C₆₀ fullerene aqueous colloid solution is described. The structural organization of C₆₀ fullerenes in aqueous solution was studied and analyzed in detail using various techniques such as chemical analysis, UV/VIS spectroscopy, atomic force and scanning tunneling microscopy, dynamic light scattering, and zeta potential method
Levy stable noise induced transitions: stochastic resonance, resonant activation and dynamic hysteresis
A standard approach to analysis of noise-induced effects in stochastic
dynamics assumes a Gaussian character of the noise term describing interaction
of the analyzed system with its complex surroundings. An additional assumption
about the existence of timescale separation between the dynamics of the
measured observable and the typical timescale of the noise allows external
fluctuations to be modeled as temporally uncorrelated and therefore white.
However, in many natural phenomena the assumptions concerning the
abovementioned properties of "Gaussianity" and "whiteness" of the noise can be
violated. In this context, in contrast to the spatiotemporal coupling
characterizing general forms of non-Markovian or semi-Markovian L\'evy walks,
so called L\'evy flights correspond to the class of Markov processes which
still can be interpreted as white, but distributed according to a more general,
infinitely divisible, stable and non-Gaussian law. L\'evy noise-driven
non-equilibrium systems are known to manifest interesting physical properties
and have been addressed in various scenarios of physical transport exhibiting a
superdiffusive behavior. Here we present a brief overview of our recent
investigations aimed to understand features of stochastic dynamics under the
influence of L\'evy white noise perturbations. We find that the archetypal
phenomena of noise-induced ordering are robust and can be detected also in
systems driven by non-Gaussian, heavy-tailed fluctuations with infinite
variance.Comment: 7 pages, 8 figure
Comparative Analysis of Self-Aggregation of Liquid Crystalline Pt(II) Complexes in Solution and in Neat Films
Two novel cycloplatinated complexes that differ by the presence/absence of a lateral fused cyclopenteno ring, respectively, were prepared. Although contributing to only a few percentage of the whole molecular volume, the presence of this aliphatic protuberance appears to be essential for the emergence of liquid crystalline behaviour. This pair of two similar compounds, non-mesomorphic complex and mesomorphic complex, was prepared as a model to assess the possible link of the self-aggregation in solution with the appearance of the liquid crystallinity in molten state. NMR dilution studies in CDCl3 solution and X-ray diffusion study in neat films show qualitative similarity of the aggregated structures formed by liquid crystalline complex. Solution studies may therefore be a useful additional tool to the characterization of the liquid crystalline properties and other self-association processes of Pt(II) complexes. © 2021We thank Northumbria University, CNRS, University of Strasbourg and Russian Foundation for Basic Research (project No. 18-03-00232A ) for the support of this work
Study of Thermal Stability of Li-ion Batteries
В настоящее время вейпинг создает новую субкультуру. Употребление электронных сигарет связано с риском их самовоспламенения и взрыва. На примере Li-ионных батарей марки «Орбита» определены их температуры разложения и самовоспламенения.Currently, vaping creates a new subculture. The use of electronic cigarettes is associated with the risk of self-ignition and explosion. On the example of Li-ion batteries of the “Orbit” brand, their decomposition and auto-ignition temperatures are determined
- …