Leninskiy, Russia

Moscow State Mining University

www.msmu.ru or www.mggu.ru
Leninskiy, Russia

Moscow State Mining University is a Russian institute of higher education that prepares mining engineers. Wikipedia.

Time filter
Source Type

Sheinin V.I.,N. M. Gersevanov Scientific Research Institute of Foundations and Underground Structures | Blokhin D.I.,Moscow State Mining University
Journal of Mining Science | Year: 2012

The article describes the uniaxial compression tests on rock salt samples under monotonic loading, which were carried out with the synchronous record of changes in thermal radiation and mechanical parameters. A relationship between the nonlinear deformation stages and the features of thermomechanical processes is found. The rate of change in rock stress state is shown to affect the information value of variations in the attendant infrared radiation. The experimental results point out the possibility of using the method in monitoring of the real geomechanical objects. © 2012 Pleiades Publishing, Ltd.

Zamiralova M.E.,Moscow State Mining University | Lodewijks G.,Technical University of Delft
Bulk Solids Handling | Year: 2014

This paper presents an overview of existent pipe conveyor test rig configurations and their design advantages and disadvantages. The scope of this paper covers test rigs for static and dynamic belt tests. The paper is divided into 3 parts: Part A describes static 6-point testing devices; Part B discusses static test rigs with various frames and supports; Part C - talks about dynamic measurements. The distribution of the load exerted on the conveyor idler rolls is used as a key indicator of the test rig design performance. For the comparison of the test results obtained with the different test rigs, the most common lay-out arrangements were chosen: a straight section of an empty pipe conveyor with the overlap on the top and also at the bottom. In general the qualitative analyses revealed that the maximum loads on the individual rolls for the belt with the overlap on the top were in the range of 40% of the sum of absolute values of all the six contact forces. For the overlap on the bottom, the forces were in the range of 80%. The idler load diagrams, obtained with the various test rig configurations and belt types, deviated substantially, making their comparison between each other rather problematic. However, the test results, obtained with the some test rigs, showed similarities in the load patterns. The paper emphasises the need in development a uniform standard regarding pipe conveyor test rig configurations and the supplementary test procedure.

Zagorskii L.S.,Moscow State Mining University | Shkuratnik V.L.,Moscow State Mining University
Acoustical Physics | Year: 2014

We consider a method for solving the inverse problem of finding a two-dimensional vertical seismic velocity profile of longitudinal and transverse waves in a massif from Rayleigh polarization waves recorded on the surface. We present an algorithm of the method based on applying perturbation theory in almost-periodic functions, and as well as the polynomials of B.M. Levitan. The possibilities of the method are illustrated by the results of comparison with geological data obtained in regions of the Northern Caucasus using active seismics. We formulate the calculation stability conditions and present an example based on microseism data obtained by the Joint Institute for Physics of the Earth, Russian Academy of Sciences (OIFZ RAN) in an area of North Ossetia. © 2014 Pleiades Publishing, Ltd.

Cheltsov V.F.,Moscow State Mining University
Journal of Nanophotonics | Year: 2011

Nonperturbative theoretical analysis of the temporal evolution of a spontaneous photon with atomic frequency &ohgr;a, emitted by a motionless two-level atom in a one-dimensional high-finesse nanocavity into a single resonance decaying mode, is presented. The explicit solution of the Schrödinger equation was found in an interaction picture with use of the Green functions technique. It has been assumed that emission leaks out of the empty cavity by exponential law at rate &Ggr;, which is a function of coupling constant g, distance between the mirrors, penetrability coefficient of the left mirror, and the velocity of light. The stationary superpositional co-phased structure of two photons with the same profiles and average frequencies 1/2(&ohgr;a ± g), quenched with continuum of final photonics states, has been revealed. The profile of this structure has been found to have the form &Ggr;t exp(-&Ggr;t/4) with maximum attained for &Ggr;/4g = 0.05 and average photon cavity lifetime equal to 4ln&Ggr;/&Ggr;. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

Cheltsov V.,Moscow State Mining University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The exact theory of generating the "entangled photons" by excited motionless two level atom in one-dimensional high finesse nanocavity with a single resonance linearly polarized mode, decaying at the rate Γ, is presented. We have investigated the evolution of resonance emission out of the macromolecule-like system "nanocavity with resonance mode and excited atom" in area 0≤ Γ≤ 0.2g , where g is a coupling constant for electro-dipolar interaction. We have revealed that the source of arising of the entangled photons at the outlet of nanocavity is disintegration of metastable interference superpositional field structure, ejected through the partly transparent mirror out of the cavity. This structure is produced by the self-consistent AC Stark effect, created by electrical fields of rotating atomic dipole and resonance mode. The field splits atomic levels and radiation transitions between them, producing in the nanocavity pairs of anti-phase (ω a ± g)- photons. Since the rate of mode damping Γ ≪ g these photons form in the cavity metastable interference superposional structure consisting of resonance mode carring wave with amplitude modulated with frequency 2g. The profiles of (ω a ± g )- components have identical form exp(-t Γ)t Γ, with average lifetime in the cavity being estimated as 4ln Γ/Γ. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

It is shown that for a given geometric body, the Ferrers theorem not only relates the potentials of volume- and surface-distributed scalar (charge or mass) sources (which it is known to do) but also relates the vector (scalar) magnetic field potentials produced by the volume- and surface-distributed densities of a stationary current (i.e., vector sources). For a body with a given magnetization, the magnetic multipole mo- ments calculated from expressions for polarization magnetic charges are shown to be equal to those of AmpeÁre currents. Using these results and noting the universality of the multipole expressions, multipole representations of the scalar magnetic potential of an ellipsoid can be (and, indeed, have been) obtained rather straightforwardly. © 2012 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

Abramov A.A.,Moscow State Mining University
Tsvetnye Metally | Year: 2013

In this part of the article theoretical bases of the contemporary flotation extremely necessary for creation of innovative flotation technologies and increase in efficiency of technological processes and complexity use of mineral raw material are considered. It is shown, that conditions for formation on a minerals surface of valence-saturated bonds of the collector with a mineral cation required by Taggart's "chemical theory", formation of chemisorption coverings of the collector by Shwedov's hypothesis, physical sorption of ions, molecules or their complexes by other hypotheses cannot be used as the criterion for innovative flotation technologies and do not allow to solve the problem discussed. On the basis of the modern flotation theory requirements to the structure of the collector sorption layer the new flotation hypothesis is offered for this purpose. By this hypothesis the effective flotation of a mineral occurs if only as the chemically fixed and physically sorbed collector are present on its surface. In this case as the thermodynamic probability of a mineral particle fastening on an air bubble and opportunity of the effective break of the hydrate layer between them as well as repeated hardening of the air bubble - particle contact in turbulent conditions of flotation are provided. Absence of any of forms of collector sorption on the surface of the mineral not possessing natural hydrophobicity leads to its depression. Requirements of the new flotation hypothesis to the structure of the sorption layer on the surface of minerals to be divided can be realized through calculation of electrochemical parameters values of the mineral surface and ionic composition of the liquid phase of pulp. It permits (as will be shown in the next part of the article) to offer theoretically grounded ways for creation of innovative flotation technologies.

In this part of the article the essence, mechanism, conditions and methods for intensification of flotation processes necessary for increase in technological and economic indices of dressing of ores of nonferrous metals are considered. It is shown that optimal conditions for various methods of intensification of recovered minerals flotation are the methods for securing of flotation theory requirements to the composition of the collector sorption layer on their surface. Optimization of the collector sorption layer on the surface of minerals to be recovered is achieved by cleaning of their surface and its activation with heavy metals salts, by activation of oxidation processes of ionogenic heteropolar collectors, by use of additional nonionogenic apolar collectors and mixtures of ionogenic and nonionogenic heteropolar collectors. Necessary relaxation parameters of the bubbles surface can be provided with formation on it of definite overmolecular structures of organic hydrophobic substances. Conditions necessary for optimization of intensification processes can be determined as a result of physical-chemical modeling of corresponding flotation systems.

Davydov M.V.,Moscow State Mining University
Coke and Chemistry | Year: 2012

Practical data are presented regarding coal extraction and enrichment. Water flow rates for jigging are recommended. The additional secondary slurry formed is expressed as a function of the depth of coal enrichment. The quantity of additional slurry in the ≤0. 5 mm class that is formed in the basic operations is determined. The major manufacturers of effective flocculants are listed. Russian and non-Russian approaches to improving the operation of water-slurry systems are analyzed and compared. © 2012 Allerton Press, Inc.

Abramov A.A.,Moscow State Mining University
Journal of Mining Science | Year: 2011

On the ground of the flotation theory requirements to composition of a collector layer adsorbed at the surface of minerals under flotation and depressing, the regularities of the effect exerted by intra-molecular and inter-molecular interactions on physicochemical properties of collectors, the selectivity conditions of the relationship between the functional group of a collector and crystal lattice elements of a mineral, as well as the demands for physical sorption form of collectors, the article couches and validates design principles for selective collecting agents. © 2011 Pleiades Publishing, Ltd.

Loading Moscow State Mining University collaborators
Loading Moscow State Mining University collaborators