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Sergiienko S.A.,Ukrainian Academy of Sciences | Pogorelov B.V.,Ukrainian Academy of Sciences | Daniliuk V.B.,NASU Institute of Electrodynamics
Separation and Purification Technology | Year: 2014

A study on recycling silicon and silicon carbide powders from wire-saw slurry containing silicon carbide, silicon kerfs, polyethylene glycol (PEG), and iron fragments in the wire-saw slicing silicon ingots process was conducted. Recycling technology was suggested. PEG from the slurry was removed using filter press, and iron particles from the slurry were removed using high gradient magnetic separator. To separate silicon carbide and silicon particles hydrocyclone assembly was used. Recovered silicon carbide powder (95 wt% SiC, 4 wt% Si and 1 wt% Fe) can be used again in the process of cutting silicon ingots. Obtained recovered powder with high Si content after additional purification further can be used as a feedstock together with the amorphous silicon for crystal growth by directional solidification in an induction furnace. © 2014 Elsevier B.V. All rights reserved. Source


Khalikov V.A.,NASU Institute of Electrodynamics
Technical Electrodynamics | Year: 2012

Transient processes appearing over core saturation on switching of the primary winding of a three-phase transformer are considered. Visual modeling of transient processes is done with MATLAB and techniques for minimization or elimination of transients are suggested. Source


Zakharchenko S.N.,NASU Institute of Electrodynamics
Technical Electrodynamics | Year: 2012

Results of research of dependence of equivalent electric resistance of a layer of metal granules from time and from a current proceeding in a layer on example Al are given. Characteristics of areas of dependence of resistance from time are described. The critical analysis of the functions approximating nonlinear dependence of resistance from a current by means of three known and one original criteria is carried out. It is shown that in the best way given dependence is described by hyperbolic function of the first degree on which basis the equivalent circuit of electric resistance of the granulated current-carrying medium is offered. Source


Kucheriava I.M.,NASU Institute of Electrodynamics
Technical Electrodynamics | Year: 2012

As applied to polymer insulation of extra-high voltage power cable, the distributions of volume electric force and connected with the force mechanical stress in the zone of separate water microinclusion and inclusion with treeing channel are studied. The qualitative patterns and quantitative estimations for the values of electric force and maximum von Mises stress are obtained for microinclusions of different sizes. The mathematical model and computer program are developed to determine electric force and mechanical stress in polyethylene taking into account structural defects filled with water as well as to simulate the mechanism of destructive action on inhomogeneous insulating material. Source


Bragynets I.O.,NASU Institute of Electrodynamics
Technical Electrodynamics | Year: 2013

The possibility of reducing the influence of low-frequency noise in the laser phase-frequency rangefinders, which leads to a short-term instability of converting links of the device has been reviewe. This is achieved through the use of filtering the output signal of the phase-frequency system, the frequency which is proportional to the measured distance. The electronic simulation of converting processes in such system was carried out for which the output signal models in analog and discrete form were received. The results of the simulation allow to choose optimal parameters for a high pass filter according to the allowable value of the error arising from the transition processes in it. By numerical simulations assessment of the random error of the device due to the influence of broadband noise has been carried out. The simulation results are presented as a function of the random error from the signal/noise ratio for the selected filter time constant. References 7, tables 2, figure 1. Source

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