Transbaikal State University

Chita, Russia

Transbaikal State University

Chita, Russia
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Filippova E.V.,Transbaikal State University
IOP Conference Series: Earth and Environmental Science | Year: 2017

Discoveries in the area of hydrometallurgy of noble metals can be of use in metal recovery from low-grade solutions and slurries, including liquid tailings. Efficiency of noble metal recovery and reduction in mining waste is gained owing to utilization of two forms of ion-exchange sorbent, including OH- for recovery of cyanic compounds of gold and cyanides, which allows abating burden on natural systems. © Published under licence by IOP Publishing Ltd.

Stepanov N.P.,Transbaikal State University | Kalashnikov A.A.,Transbaikal Institute of Railroad Transport | Ulashkevich Y.V.,RAS Ioffe Physical - Technical Institute
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2014

The regularities of changes in the optical properties of crystals of Bi2Te3-Sb2Te3 solid solutions in the range of the effects caused by free-carrier plasma oscillations at a variation in the ratio of Bi2Te3 and Sb2Te3 components are investigated. It is established that, when the Sb2Te3 content in a solid solution exceeds 80 mol %, the fundamental absorption edge undergoes plasma screening. Doping a Sb2Te3 crystal with tin increases the free-carrier concentration and plasma frequencies, thus enhancing the screening effect, whereas introduction of 0.1 mol % selenium reduced the plasma frequency and thus removes the fundamental-absorption-edge screening. © 2014, Pleiades Publishing, Ltd.

Mazalov V.,Institute of Applied Mathematical Research | Konovalchikova E.,Transbaikal State University
Procedia Computer Science | Year: 2015

This paper considers a best-choice game with incomplete information associated with the job search problem. Players (experts) observe a sequence of independent identically distributed random variables (xi, yi), i = 1 . . . , n, which represent the quality of incoming objects. The first component is announced to the players and the other one is hidden. The players choose an object based on known information about it. The winner is the player having a higher sum of the quality components (total quality) than the opponent. And finally, the optimal strategies of the players are derived. © 2015 The Authors. Published by Elsevier B.V.

Lavrov A.Yu.,Transbaikal State University
Gornyi Zhurnal | Year: 2015

Besides the known forms of gold, reserves of which are being depleted, increasing emphasis is placed on micron, submicron and dispersed gold. Bulk of dispersed gold occurs between lattice points of minerals-concentrators. These can be either separate atoms or clusters of gold. In this case, gold recovery is possible through leaching of atoms making up the mineral. The active forms of oxygen, first and foremost, ozone, were proposed to be used to activate oxidation of sulfides containing gold by Corresponding Member of the USSR Academy of Sciences I. N. Plaksin as early as the 1940s. Somewhat afterwards, this area of research engaged scientists in America and Japan. In recent years, the similar studies are under way at the Moscow State University and the National University of Science and Technology. The most active forms of oxygen and their effect on oxidation were investigated by W. P. Van Antverp and Ph. A. Lincoln. The researchers found that oxidation is influenced not by ozone only but, to a great extent, by hydroxyl radical OHo (its redox potential reaches 2.3 V solely giving way to F). Treatment of water-air emulsion by ultra-violet creates active types of oxygen-O, O3, H2O2, OH etc-inside bubbles with pure oxygen or bubbles with mix of gases (O2+ H2). A time-phased large-scale experiment was carried out in Aprelkovo Mine, NordGold, in April 2014-April, 2015. The longest phase trial, with maximum feed of percolators with ore pelletized in active solutions, and with recirculation of leaching solutions showed that increment of recovery was 20.5% in the proposed process flow diagram as against the process chart currently in use in the Mine, and was higher by 7.5% than in the process flow diagram with peroxide used as an oxidizer. Photoelectrochemical activation of working solutions and liquid phase of ore pulp ensures, owing to highly active oxidizers being formed, considerable rise in recovery of dispersed gold from ore and mine waste using both heap and agitation leaching circuits. This allows recommending the proposed technology as early as the given stage of development for commercial introduction in gold mines in Transbaikalia and Russian Far East.

Stepanov N.P.,Transbaikal State University | Nalivkin V.Y.,Transbaikal State University
Russian Physics Journal | Year: 2016

A technique is presented, by which the magnetic susceptibility χ| G of the ion core of an anisotropic semiconductor Bi2Te3–Sb2Te3 crystal is determined from experimental data on the magnetic susceptibility χ∥ and χ⊥ obtained with allowance for the orientation of the magnetic field vector H with respect to the trigonal C3 axis of the crystal in accordance with the expression χ∥/χ⊥ = (χ∥ eh + χG)/(χ⊥ eh + χG).In this expression, the value of the magnetic susceptibility of free charge carriers χ∥ eh and χ⊥ eh depending on their effective masses m∥ * and m⊥ * known from the experiment is calculated within the framework of the Pauli and Landau- Peierls approaches. The found value of χ| Gfor Bi2Te3–Sb2Te3 crystals is in good agreement with experimental data, as well as with the estimates obtained in the framework of the Larmor approach explaining, in particular, a linear dependence of the molar magnetic susceptibility on the number of electrons in the molecule observed for a large number of compounds. The proposed technique can be extended to other anisotropic semiconductors. © 2016, Springer Science+Business Media New York.

Mazalov V.V.,Russian Academy of Sciences | Tsynguev B.T.,Transbaikal State University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016

This paper extends the concept of betweenness centrality based on Kirchhoff’s law for electric circuits from centrality of nodes to centrality of edges. It is shown that this new measure admits analytical definition for some classes of networks such as bipartite graphs, with computation for larger networks. This measure is applied for detecting community structure within networks. The results of numerical experiments for some examples of networks, in particular, (a Web portal of mathematical publications) are presented, and a comparison with PageRank is given. © Springer International Publishing Switzerland 2016.

Avrachenkov K.E.,French Institute for Research in Computer Science and Automation | Mazalov V.V.,Russian Academy of Sciences | Tsynguev B.T.,Transbaikal State University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Betweenness centrality is one of the basic concepts in the analysis of social networks. Initial definition for the betweenness of a node in a graph is based on the fraction of the number of geodesics (shortest paths) between any two nodes that given node lies on, to the total number of the shortest paths connecting these nodes. This method has quadratic complexity and does not take into account indirect paths. We propose a new concept of betweenness centrality for weighted network, beta current flow centrality, based on Kirchhoff’s law for electric circuits. In comparison with the original current flow centrality and alpha current flow centrality, this new measure can be computed for larger networks. The results of numerical experiments for some examples of networks, in particular, for the popular social network VKontakte as well as the comparison with PageRank method are presented. © Springer International Publishing Switzerland 2015.

Konovalchikova E.N.,Transbaikal State University | Mazalov V.V.,Russian Academy of Sciences
Automation and Remote Control | Year: 2016

This paper proposes a game-theoretic model of the two-player best-choice problem with incomplete information. The players (experts) choose between objects by observing their quality in the form of two components forming a sequence of random variables (xi, yi), i = 1,.., n. By assumption, the first quality component xi is known to the players and the second one yi is hidden. A player accepts or declines an object based on the first quality component only. A player with the maximal sum of the components becomes the winner in the game. The optimal strategies are derived in the cases of independent and correlated quality components. © 2016, Pleiades Publishing, Ltd.

Glazyrina I.P.,Russian Academy of Sciences | Kalgina I.S.,Transbaikal State University | Lavlinskii S.M.,Russian Academy of Sciences
Regional Research of Russia | Year: 2013

The paper discusses efficiency of mineral and raw materials development projects and coordina- tion of the long-term interests of public and private investors in cross-border Russian-Chinese cooperation activities. A series of empirical studies on development in the border regions of Russia's Far East over the last decades have signaled that these territories really faced risks of lagging behind. The problem associated with the provision of national interests within Russian-Chinese cooperation was illustrated on the example of two projects to be implemented in Zabaikalsky krai. The projects were evaluated using scenario analysis based on the author's methods. The estimates show that the interest of an investor, the fulfillment of Russia's legislative procedures, and the presence of market demand for products cannot always guarantee the procurement of Russia's national interests and "symmetrical" outcomes in the framework of Russian-Chinese cooperation. Searching for a compromise of interests, a methodical scheme has been offered to provide sufficient levels of sustainability and profitability for the Russian party in joint cross-border projects. © Pleiades Publishing, Ltd., 2013. Original Russian Text © I.P. Glazyrina, I.S. Kalgina, S.M. Lavlinskii, 2012.

Stepanov N.P.,Transbaikal State University | Nalivkin V.Y.,Transbaikal State University
Semiconductors | Year: 2014

Temperature dependences of the magnetic susceptibility of Bi2Te3-Sb2Te3 with 10, 25, and 50% of Sb2Te3 are experimentally studied using an MPMS MultiVu SQUID magnetometer (Quantum Design, USA) in the temperature range from 2 to 400 K with regard to the anisotropy of the magnetic susceptibility. The behavior of the magnetic susceptibility at temperatures above 250 K is analyzed where the electron system of the crystals passes to the nondegenerate state. It is shown that the temperature dependence of the magnetic susceptibility in the intrinsic conductivity region can be described within the framework of the Pauli and Landau-Peierls approaches. © 2014 Pleiades Publishing, Ltd.

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