Electro-Fenton-like reactions of transition metal ions with electrogenerated hydrogen peroxide

We evaluated and compared the hydroxyl radical-generating ability of chromium, iron, cobalt, nickel, copper, lanthanum, and cerium ions when reacted with electrogenerated hydrogen peroxide by usage the voltammetry. There was reproduced an electro-Fenton-like reaction in electrochemical cell when metal salt added. The nature of metal ions determined the appearance and increasing of current of hydroxyl radicals cathodic reduction due to individual rate of the redox cycling of metal ions with ongoing cathodic regeneration of Fenton-active metal ions oxidation state. The approximated current magnitude growth in relation to metal ions concentration was calculated for each tested metal. It expressed in μA·ml·μmol−1 and is equal to HO•-generating ability of metal ions. Results are usable for improvement of advanced oxidation processes (AOPs) through enhancement of exploitation of electro-Fenton-like processes with selecting metals that are more active. Besides, in accordance with concept of metal-induced hydroxyl radical stress in biological systems, the hydroxyl radical-generating ability of metal ions is equal to their pro-oxidant capacity

ИНТЕРТЕТ КАК НОВАЦИОННАЯ ФОРМА ОБРАЗОВАНИЯ В УСЛОВИЯХ ГЛОБАЛИЗАЦИИ

The article explores the relevant aspects of cultural policy in education. The author puts forward the idea about organization of educational process in the context of active integration of various sciences and personnel training in global studies considered as a new area of interdisciplinary knowledge. The paper shows fundamental difference between global studies and private sciences and raises a question of creation modern universities that can serve as an alternative to the faculties of intertet. The article makes grounds that these are intertets that can arrange education on the basis of interdisciplinary approach and international relations as this is the urgent task in the current globalization.В статье обсуждаются актуальные вопросы культурной политики в сфере образования. Поднимается проблема организации учебного процесса в условиях активной интеграции различных наук и подготовки кадров в новейшей области междисциплинарного знания – глобалистике. Показано принципиальное отличие глобалистики от частных наук и ставится вопрос о создании в структуре современных университетов альтернативных факультетам интертетов. Обосновывается, что именно интертеты способны обеспечить организацию образования на междисциплинарной основе с опорой на широкие международные связи, что в условиях современной глобализации является задачей первостепенной важности

Coronavirus and Globalization: Knowledge vs Concept

The coronavirus pandemic has generated a lot of talk about the post-coronavirus future of the world community and has drawn close attention to the globalization process. The article notes that something similar in the public consciousness took place after the publication of the first report to the Club of Rome, when the awareness of the danger posed by global problems had quickly come. Now, one of the global problems — the coronavirus pandemic — has changed the usual life rhythm of the entire world community in a matter of weeks. The relevance of the topic is so high that even those who, before that, not only professionally, but even seriously were not interested in either the problems of medicine or global problems, actively joined its discussion. As a result, on the pages of many print and electronic publications, along with serious and verified information, all sorts of guesses and speculations about the nature and correlation of coronavirus and globalization are multiplied. Only knowledge can be opposed to this, according to the authors

Double-spiral magnetic structure of the Fe/Cr multilayer revealed by nuclear resonance scattering

We have studied the magnetization depth profiles in a [57Fe(dFe)/Cr(dCr)]x30 multilayer with ultrathin Fe layers and nominal thickness of the chromium spacers dCr 2.0 nm using nuclear resonance scattering of synchrotron radiation. The presence of a broad pure-magnetic half-order (1/2) Bragg reflection has been detected at zero external field. The joint fit of the reflectivity curves and Mossbauer spectra of reflectivity measured near the critical angle and at the "magnetic" peak reveals that the magnetic structure of the multilayer is formed by two spirals, one in the odd and another one in the even iron layers, with the opposite signs of rotation. The double-spiral structure starts from the surface with the almost antiferromagnetic alignment of the adjacent Fe layers. The rotation of the two spirals leads to nearly ferromagnetic alignment of the two magnetic subsystems at some depth, where the sudden turn of the magnetic vectors by ~180 deg (spin-flop) appears, and both spirals start to rotate in opposite directions. The observation of this unusual double-spiral magnetic structure suggests that the unique properties of giant magneto-resistance devices can be further tailored using ultrathin magnetic layers.Comment: 9 pages, 3 figure

Effect of subphase conditions on the formation of graphene Langmuir monolayer

This work was supported by grant from DAAD 4.9977.2017/5.2

Magnetic Phase Separation and Magnetic Moment Alignment in Ordered Alloys FE 65

The structure and the magnetic state of ordered Fe65Al35-xMx (Mx = Ga, B; x = 0; 5 at.%) alloys are investigated using X-ray diffraction, Mössbauer spectroscopy, and magnetic measurements. The behavior of the magnetic characteristics and Mössbauer spectra of the binary alloy Fe65Al35 and the ternary alloy with gallium addition Fe65Al30Ga5 is explained in terms of the phase separation into two magnetic phases: a ferromagnetic one and a spin density wave. It is shown that the addition of boron to the initial binary alloy Fe65Al35 results in the ferromagnetic behavior of the ternary alloy

Lattice dynamics of coesite

The lattice dynamics of coesite has been studied by a combination of diffuse x-ray scattering, inelastic x-ray scattering and ab initio lattice dynamics calculations. The combined technique gives access to the full lattice dynamics in the harmonic description and thus eventually provides detailed information on the elastic properties, the stability and metastability of crystalline systems. The experimentally validated calculation was used for the investigation of the eigenvectors, mode character and their contribution to the density of vibrational states. High-symmetry sections of the reciprocal space distribution of diffuse scattering and inelastic x-ray scattering spectra as well as the density of vibrational states and the dispersion relation are reported and compared to the calculation. A critical point at the zone boundary is found to contribute strongly to the main peak of the low-energy part in the density of vibrational states. Comparison with the most abundant SiO2 polymorph - α-quartz - reveals similarities and distinct differences in the low-energy vibrational properties

Study of the surface microrelief of copper nanoparticles by the method of scanning probe microscopy

This work was supported by grants from the RFBR № 17-07-00407-а and № 17-32-50137-mol_nr