Line form of Mossbauer spectra as an evidence of electron exchange in system CuO-Fe2O3

Investigations of line form and hyperfine structure parameters of Fe 57 nuclei in copper ferrites were carried out by Mossbauer spectroscopy. It is shown that increasing of synthesis temperature leads to redistribution of copper and iron ions among lattice sites. This results in changing of local magnetic fields at iron nuclei and varying of relative intensities of spectrum components. However, detailed study of Mossbauer spectrum line forms for all samples did not allow to detect the influence of nearest cations environment of iron ions in octohedral sites on local field value, which is the case in other spinel structure ferrites. One of possible reasons is strong electron exchange between Cu and Fe ions in octahedral sublattice

TO THE QUESTION OF PREPARATION OF WORKERS IN THE CONDITIONS OF INDUSTRIAL PRODUCTION

В статье рассматриваются актуальность разработки содержательных компонентов подготовки рабочих в условиях промышленного производства, актуальность применения имитационных технологий обученияThe article discusses the relevance of the development of substantial components of the training of workers in industrial production, the relevance of the use of simulation training technologie

Problems and prospects of human capital development in modern Russia

Purpose: In the context of dynamically changing modern labor market there is a need to develop a model of congruence and correlation of the process of building professional competencies provided by educational standards. Design/Methodology/Approach: The study was performed using monographic, abstract logical, sociological and statistical methods. However, this approach does not imply the formation of supra-professional competencies, which generally predetermine the success of professional tasks performed by a specialist. Findings: The article discusses the role of human capital as a fundamental factor affecting the increase in the competitiveness of production. Practical implications: The study focusses on the most demanded competencies for the development of digital society. The authors have grouped countries by level of human capital use. Originality/Value: At present, the appropriate parameters for measuring professional and general cultural competencies have been adopted as a system for assessing the quality of education in general and the quality of specialist training.peer-reviewe

Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4

We report high-resolution optical absorption spectra for NdFe3(BO3)4 trigonal single crystal which is known to exhibit a giant magnetoelectric effect below the temperature of magnetic ordering TN = 33 K. The analysis of the temperature-dependent polarized spectra reveals the energies and, in some cases, symmetries and exchange splittings of Nd3+ 84 Kramers doublets. We perform crystal-field calculations starting from the exchange-charge model, obtain a set of six real crystal-field parameters, and calculate wave functions and magnetic g-factors. In particular, the values g(perpendicular) = 2.385, g(parallel) = 1.376 were found for the Nd3+ ground-state doublet. We obtain Bloc=7.88 T and |JFN|= 0.48 K for the values of the local effective magnetic field at liquid helium temperatures at the Nd3+ site and the Nd - Fe exchange integral, respectively, using the experimentally measured Nd3+ ground-state splitting of 8.8 cm-1. To check reliability of our set of crystal field parameters we model the magnetic susceptibility data from literature. A dimer containing two nearest-neighbor iron ions in the spiral chain is considered to partly account for quasi-one-dimensional properties of iron borates, and then the mean-field approximation is used. The results of calculations with the exchange parameters for Fe3+ ions Jnn = -6.25 K (intra-chain interactions) and Jnnn = -1.92 K (inter-chain interactions) obtained from fitting agree well with the experimental data.Comment: 13 pages, 8 figures, 2 table

Detection of magnetized quark-nuggets, a candidate for dark matter

AbstractQuark nuggets are theoretical objects composed of approximately equal numbers of up, down, and strange quarks and are also called strangelets and nuclearites. They have been proposed as a candidate for dark matter, which constitutes ~85% of the universe’s mass and which has been a mystery for decades. Previous efforts to detect quark nuggets assumed that the nuclear-density core interacts directly with the surrounding matter so the stopping power is minimal. Tatsumi found that quark nuggets could well exist as a ferromagnetic liquid with a ~1012-T magnetic field. We find that the magnetic field produces a magnetopause with surrounding plasma, as the earth’s magnetic field produces a magnetopause with the solar wind, and substantially increases their energy deposition rate in matter. We use the magnetopause model to compute the energy deposition as a function of quark-nugget mass and to analyze testing the quark-nugget hypothesis for dark matter by observations in air, water, and land. We conclude the water option is most promising.</jats:p

Local raw materials ceramic tile

In article the production of ceramic tiles with the aim of replacing imported analogues on the construction materials market in the Urals region. As a result of the studies established the suitability of the Sadovoe clay deposits for the production of ceramic tiles of high quality.В работе предложено производство керамической черепицы с целью замены импортируемых аналогов на рынке строительных материалов Уральского региона. В результате проведенных исследований установлена пригодность глины Садового месторождения для производства керамической черепицы высокого качества

MODEL OF THE PROCESS OF ADDITIONAL PROFESSIONAL TRAINING OF WORKERS IN THE CONDITIONS OF THE INDUSTRIAL ENTERPRISE

В статье представлена разработка модели процесса дополнительной профессиональной подготовки рабочих в условиях промышленного предприятияThe article presents the development of a model for the process of additional professional training of workers in an industrial enterpris

PEDAGOGICAL TECHNOLOGIES IN THE ORGANIZATION OF ADDITIONAL PROFESSIONAL TRAINING OF WORKERS IN AN INDUSTRIAL ENTERPRISE

В статье рассматриваются возможности применения элементов современных педагогических технологий в процессе подготовки рабочих кадров в условиях промышленного предприятияThe article considers the possibilities of applying elements of modern pedagogical technologies in the process of training workers in an industrial enterpris

Simulations of magnetic and magnetoelastic properties of Tb2Ti2O7 in paramagnetic phase

Magnetic and magnetoelastic properties of terbium titanate pyrochlore in paramagnetic phase are simulated. The magnetic field and temperature dependences of magnetization and forced magnetostriction in Tb2Ti2O7 single crystals and polycrystalline samples are calculated in the framework of exchange charge model of crystal field theory and a mean field approximation. The set of electron-deformation coupling constants has been determined. Variations of elastic constants with temperature and applied magnetic field are discussed. Additional strong softening of the crystal lattice at liquid helium temperatures in the magnetic field directed along the rhombic symmetry axis is predicted.Comment: 13 pages, 4 figures, 2 table

Weighted ergodic theorems for Banach-Kantorovich lattice Lp(∇^,μ^)L_{p}(\hat{\nabla},\hat{\mu})

In the present paper we prove weighted ergodic theorems and multiparameter weighted ergodic theorems for positive contractions acting on $L_p(\hat{\nabla},\hat{\mu})$. Our main tool is the use of methods of measurable bundles of Banach-Kantorovich lattices.Comment: 11 page