National Research Irkutsk State Technical University
Irkutsk, Russia
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Nizhegorodov A.I.,National Research Irkutsk State Technical University
IOP Conference Series: Materials Science and Engineering | Year: 2017

The paper deals with a new concept of electric furnaces for roasting and thermal energization of vermiculite and other minerals with vibrational transportation of a single-layer mass under constant thermal field. The paper presents performance calculation and comparative assessment of energy data for furnaces of different modifications: flame and electric furnaces with three units, furnaces with six units and ones with series-parallel connection of units, and furnaces of new concept. © Published under licence by IOP Publishing Ltd.

Nizhegorodov A.I.,National Research Irkutsk State Technical University
Russian Engineering Research | Year: 2017

The improvement of energy-saving modular electric furnaces for the thermal activation of minerals is considered. It is expedient to introduce a nonelectrified roasting module based on secondary energy resources so as to complete the dehydration and expansion of vermiculite and/or the thermal activation of sungulite–vermiculite conglomerates. © 2017, Allerton Press, Inc.

Nikolaev A.Yu.,National Research Irkutsk State Technical University
IOP Conference Series: Materials Science and Engineering | Year: 2017

The article considers the dynamics of the plain milling process. The model takes into account the time-lag effect due to the algorithm of new surface formation during material cutting-off. A reduced model based on the results of a modal analysis of the milling cutter is applied to describe the dynamics of the tool. The results of the work are presented in the comparison of the microprofiles obtained as a result of processing and simulation of surfaces. © Published under licence by IOP Publishing Ltd.

Petrushenko I.K.,National Research Irkutsk State Technical University
Journal of Nano- and Electronic Physics | Year: 2016

We carry out quantum chemistry calculations on armchair graphene nanoribbons (AGNRs) using density- functional theory. PVE/SVP results for the dependence of energies of the highest occupied (HOMO) and lowest unoccupied molecular orbitals (LUMO) as well as energy gaps on AGNR widths and lengths are presented. We compare the HOMO and LUMO energies of a series of AGNRs with those energies of fullerene C60 and its soluble derivative, PCBM, to ascertain whether it is possible to use such AGNRs as electron acceptors in organic solar cells. The influence of Stone-Wales defects embedded in the frameworks of AGNRs on their electronic properties is also studied. © 2016 Sumy State University.

Petrushenko I.K.,National Research Irkutsk State Technical University
Journal of Nano- and Electronic Physics | Year: 2017

Using standard GGA PBE as well as dispersion-corrected PBE-D3 and B3LYP-D3 functionals we have theoretically studied the adsorption of a hydrogen molecule onto pristine and N-doped graphene. We have found that the van der Waals interactions make an important contribution to adsorption energy (Ea) of H2. In graphene, the step-by-step substitution of carbon atoms with nitrogen modifies Ea values. All three methods used predict the considerable increase in Ea for N-doped graphene, when the horizontal configuration is considered. The results of the present study indicate that the introduction of the small number of nitrogen atoms may increase the adsorption energy in graphene, but the increment, seemingly, is dependent on the configuration of the interacting species. © 2017 Sumy State University.

Nizhegorodov A.I.,National Research Irkutsk State Technical University
Gornyi Zhurnal | Year: 2017

The technological aspects of production of expanded vermiculite and thermally activated sungulite from dumped overburden at Kovdor phlogopite-vermiculite deposit in the Murmansk Region are discussed in the article. The mentioned objective is successfully reached using a power and processing unit designed for thermal activation of sungulite and expansion of vermiculite in the mode of thermal shock at a heating rate of 150-200 °/s. The feature of the power and processing unit is that the thermal energy recuperated by a treated material is used for the implementation of the specified processes as the material passes auxiliary non-electrified modules. Efficiency of the auxiliary modules has experimentally been proved-Their application allows power consumption to be reduced by 25 %. After thermal treatment in the power and processing unit, sungulite loses up to 18 % in weight while the accompanying olivine-pyroxene phase remains unchanged. Therefore, after air separation of vermiculite, the residue is subjected to vibro-segregation with respect to density until ultimate removal. As a result, sungulite concentrate with the target product content of 85-90 % and expanded vermiculite are produced. The final stage is ageing of sungulite under the temperature of 700-750 ° for 20-25 min. By estimates, from 1000 kg of vermiculite-sungulite waste, it is possible to produce round 100 kg of sungulite and up to 1.5 m3 of expanded vermiculite, as well as 420 kg of mason's sand.

Papernyi V.L.,Irkutsk State University | Lebedev N.V.,National Research Irkutsk State Technical University
Plasma Physics Reports | Year: 2014

The propagation of a metal plasma jet in a transport system with a curvilinear magnetic field was studied experimentally. The jet was generated by a pulsed vacuum arc discharge with a composite (W + Fe) cathode. Spatial separation of ions of the cathode material was observed at the exit from the system. The ions of the lighter element (Fe) were concentrated in the inner part of the cathode plasma jet deflected by the magnetic field. The jet is also found to be deflected along the binormal to the magnetic field lines due to plasma drift in the crossed magnetic and electric fields. The degree of mass separation of elements is shown to increase with increasing jet deflection along the binormal. The maximum value of the mass separation efficiency reaches 45, the effective value being 7.7. © 2014 Pleiades Publishing, Ltd.

Tulokhonova A.,National Research Irkutsk State Technical University | Ulanova O.,National Research Irkutsk State Technical University
Waste Management and Research | Year: 2013

Continuous growth in the quantity of municipal solid waste (MSW) and increasing demands for their environmentally-friendly treatment are one of the main consequences of the growing social and economic development rate in modern society. Despite ecologically sustainable trends in waste management systems around the world, open dumps are still the main waste treatment option in Russia. This study aims to help the local municipality administration in Irkutsk (Russia) identify the most appropriate direction for current waste management and its optimization. Within this study four developed MSW management scenarios were assessed and compared with respect to their ecological, economic and social aspects using a life cycle-based integrated waste management model. The evaluation results of these scenarios show that the development of environmental sustainability and the reduction of social effects lead to an increase in handling of costs of waste. The best scenario, regarding both environmental and social aspects, is scenario four, which includes the separate collection and reprocessing of recyclables in combination with an aerobic mechanical-biological pre-treatment of the residual waste before landfilling. However, this scenario is 3.6 times more expensive than the existing system. The results of all assessed scenarios were further analyzed and recommendations were made to design integrated waste management solutions that are optimal not only from the ecological and social points of view, but which are also realistic within the given economic situation. © The Author(s) 2013.

Petrushenko I.K.,National Research Irkutsk State Technical University
Modern Physics Letters B | Year: 2016

This paper studies the mechanical properties of polyethylene (PE)-Single-walled carbon nanotube (SWCNT) complexes by using density functional theory (DFT). At the PBE/SVP level, the Young's modulus of the complexes is obtained as a function of PE content. It is established that, with increasing number of PE chains attached to the SWCNTs, the Young's modulus monotonically decreases. The density of states (DOS) results show that no orbital hybridization exists between the PE chains and nanotubes. The results of this work are of importance for the design of composite materials employing SWCNTs. © 2016 World Scientific Publishing Company.

Nikolaeva E.P.,National Research Irkutsk State Technical University
Solid State Phenomena | Year: 2016

The plasma processing causes a change of a surface layer structure and characteristics of the surface layer of the material. During plasma processing the surface is subjected to ultrafast heating and cooling which causes a thin hardened layer, and the resulting non-equilibrium structure of the layer provides properties that are different from the properties of the base metal. Since transformations in alloys due to the ultrafast heating by highly concentrated energy flows are not sufficiently explored, the surface layer structural state and its properties are of a great practical and scientific interest. The article presents study results of the St3ps steel after surface hardening with plasma arc. To study the structure of steel, the author used the microanalysis, the magnetostructural Barkhausen Noise Method; residual stresses have been determined by the x-ray diffraction. The study revealed correlation between the processing mode, steel microstructure, residual stress values and the Barkhausen noise amplitude. © 2016 Trans Tech Publications, Switzerland.

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