Malashchenko A.Y.,National Research Irkutsk State Technical University
Russian Aeronautics | Year: 2016
As a result of investigation, the reasons of forming the defects of skin aerodynamic surface shape at roll-bending were determined and technological recommendations on their prevention were provided. © 2016, Allerton Press, Inc.
Balanovskii A.E.,National Research Irkutsk State Technical University
High Temperature | Year: 2016
Pictures of an electric arc burning in argon, obtained by means of a digital camera, within the different domains of wavelengths of the visible spectrum are presented. Maps of the thermal fields of the heating spot are plotted, and the plasma temperature in the anode arc zone is calculated. The application potential of the digital image technology in the visible wavelength domain for analysis of the processes directly in the anode arc zone and for estimation of the arc column parameters is shown. © 2016, Pleiades Publishing, Ltd.
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.
Tolstikhin K.,National Research Irkutsk State Technical University |
Scholtes B.,University of Kassel
Journal of Applied Crystallography | Year: 2016
The inverse problem of evaluating residual stresses σ(z) in real space using residual stresses σ(τ) in image space is discussed. This problem is ill posed and special solution methods are required in order to obtain a stable solution. Moreover, the real-space solution must be localized in reflecting layers only in multilayer systems. This requirement imposes strong restrictions on the solution methods and does not allow one to use methods based on the inverse Laplace transform employed for compact solid materials. Besides, in the case of solid materials, the use of the inverse Laplace transform often leads to extremely unstable solutions. The stable numerical solution of the discussed inverse problem can be found using a method based on the Tikhonov regularization. Given the measured data and their pointwise error estimation, this method provides stable approximate solutions for both solid materials and thin films in the form of piecewise functions defined solely in diffracting layers. The approximations are shown to converge to the exact function when the noise in the experimental data approaches zero. If the initial data satisfy certain constraints, the method provides a stable exact solution for the inverse problem. A freely available MATLAB package has been developed, and its efficiency was demonstrated in the numerical residual stress calculations carried out for solid materials and thin films. © International Union of Crystallography, 2016.
Kuznetsov N.K.,National Research Irkutsk State Technical University
Russian Engineering Research | Year: 2016
A hydraulic damper with self-adjustment of the damping force is developed for the executive mechanisms of mechatronic systems with cyclic control. Equations of motion of an executive mechanism with the damper are proposed, taking account of the external forces. Analytical formulas are derived for the basic structural parameters of the damper. © 2016, Allerton Press, Inc.
Nizhegorodov A.I.,National Research Irkutsk State Technical University
Refractories and Industrial Ceramics | Year: 2016
A technology for firing vermiculite conglomerates with a high content of inert material is examined. The firing operation is completed in an additional “zero” module by the internal heat accumulated in the conglomerate itself. Heat is transferred by radiation from particles of the inert material to the vermiculite granules inside the conglomerate. At the same time, heat is being transferred by conduction from the outer layers of the granules to their inner layers. Such a method of using recuperated heat makes it possible to mitigate the temperature regime of the electric modules, reduce the consumption of electric power, and decrease the energy content of the process. © 2016, Springer Science+Business Media New York.
Petrushenko I.K.,National Research Irkutsk State Technical University
Journal of Nano- and Electronic Physics | Year: 2016
This paper presents quantum chemistry study on structural and mechanical properties of a series of single-walled carbon nanotubes (SWCNTs) and boron nitride nanotubes (BNNTs) functionalized with carbenes. At the PBE/SVP level, the obtained data on pristine nanotubes are in good accordance with the results of previous experimental and theoretical studies. The calculations show that carbenes functionalization, in general, distorts both SWNCTs and BNNTs frameworks, but there exists the difference between 'axial' and 'circumferential' functionalization. It turns out that in both cases elastic properties diminish with increasing concentration of adsorbents, however, the functionalized SWCNTs and BNNTs remain strong enough to be suitable for reinforcement of composites. © 2016 Sumy State University.