Dust-free starburst galaxies at redshifts z>10z>10

One of the most distant galaxies GN-z11 was formed when the Universe was $\le$ 400 Myr old, and it displays a burst-like star formation rate \sim 25~\msun yr$^{-1}$ with a metallicity $Z\sim 0.2\pm 0.1Z_\odot$. It resembles $z=2-3$ galaxies (at ``cosmic noon") except for the fact that the measured reddening $E(B-V)=0.01\pm 0.01$ indicates the presence of little or no dust. This marked absence of dust hints towards violent dynamical events that destroy or evacuate dust along with gas out of the galaxy on a relatively short time scale and make it transparent. We apply a 3D numerical model to infer possible physical characteristics of these events. We demonstrate that the energetics of the observed star formation rate is sufficient to tear apart the dusty veil on time scales of $20-25$ Myr. This can explain the apparent lack of evolution of UV luminosity function of galaxies between and $z\ge 10$ and $z\sim 7$, by compensating for the lower galaxy masses at higher redshift by the absence of dust. We show, however, that this is a temporary phenomenon and soon after the last of the supernovae explosions have taken place, the expanding shell shrinks and obscures the galaxy on time scales of $\approx 5-8$ Myr.Comment: submitted to MNRAS Letters, 5 pages, 4 figure

Features of the structure of metal composite alloy obtained by electric slag remelting with controlled magneto-hydrodynamic action

The results of experimental studies on the use of mineral raw materials containing zirconium oxides without its deep technological processing to create alloys by electroslag remelting are presented. Dependences of the transition of zirconium into remelted low-carbon steel on the magnitude of electromagnetic pulses have been established. It has been experimentally proven that zircon concentrate can be used as an alloying component to obtain alloyed alloys and coatings in electroslag technologies. In this case, the concentrate is used in a comprehensive manner, without additional technological processing

Features of the structure of metal composite alloy obtained by electric slag remelting with controlled magneto-hydrodynamic action

The results of experimental studies on the use of mineral raw materials containing zirconium oxides without its deep technological processing to create alloys by electroslag remelting are presented. Dependences of the transition of zirconium into remelted low-carbon steel on the magnitude of electromagnetic pulses have been established. It has been experimentally proven that zircon concentrate can be used as an alloying component to obtain alloyed alloys and coatings in electroslag technologies. In this case, the concentrate is used in a comprehensive manner, without additional technological processing

Production of functional materials on the basis of tungsten multicomponent mineral resources

We produced tungsten and tungsten carbide as a result of the synthesis of multicomponent tungsten mineral resource with the employment of high density energy flow. The results of experiments concerned with the possibility of using high-density energy to synthesize functional materials for industrial use are presented as well

Production of functional materials on the basis of tungsten multicomponent mineral resources

We produced tungsten and tungsten carbide as a result of the synthesis of multicomponent tungsten mineral resource with the employment of high density energy flow. The results of experiments concerned with the possibility of using high-density energy to synthesize functional materials for industrial use are presented as well