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Leninskiy, Russia

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

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). Source

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. Source

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. Source

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. Source

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. Source

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