Rejecting noise in Baikal-GVD data with neural networks

Baikal-GVD is a large ($\sim$ 1 km$^3$) underwater neutrino telescope installed in the fresh waters of Lake Baikal. The deep lake water environment is pervaded by background light, which produces detectable signals in the Baikal-GVD photosensors. We introduce a neural network for an efficient separation of these noise hits from the signal ones, stemming from the propagation of relativistic particles through the detector. The neural network has a U-net like architecture and employs temporal (causal) structure of events. On Monte-Carlo simulated data, it reaches 99% signal purity (precision) and 98% survival efficiency (recall). The benefits of using neural network for data analysis are discussed, and other possible architectures of neural networks, including graph based, are examined

Corrosion-Resistant High-Silicon Cast Iron for Chemical Engineering Components

© 2015, Springer Science+Business Media New York. A method is proposed for preparing corrosion-resistant high-silicon cast iron by processing fine waste from engineering enterprises in a self-propagating high-temperature synthesis process. Theoretical aspects for the SHS process and a practical procedure for implementing it are provided. Results of analyzing practical experiments are presented

Integral performance criterion of self-propagating high-temperature synthesis ferrosilid for optimization of charge composition

© 2017 Trans Tech Publications, Switzerland. An algorithm of optimization of the charge for metal-containing waste processing of metallurgical and foundry industries was developed. The processing method is based on the phenomenon of self-propagating high-temperature synthesis (SHS) of ferroalloys of the composition of dispersed waste without the use of external sources of heat due to internal energy

SHS ferroaluminum obtained from the disperse waste of engineering

© 2016 Trans Tech Publications, Switzerland.This article provides a method of disposing of a particulate waste that allows treatment to produce ferroaluminum. In this work the optimization of the charge composition was carried out by the planned experiment to obtain the maximum performance properties of the SHS ferroaluminum. The article presents the analysis of the conditions of formation of the ferroaluminum microstructure in the process of the self-propagating high-temperature synthesis. The SHS process is initiated in the mixture composed of the dispersed waste engineering. The factors influencing the formation of the alloy structure were brought out

Strength of shs aluminium cast iron from dispersed mechanical engineering waste

© 2018 Trans Tech Publications, Switzerland. The article presents an alternative method of obtaining aluminium cast iron in the process of self-propagating high-temperature synthesis from disperse waste of machine-building enterprises. The deficiencies of the traditional methods for obtaining structural iron castings with aluminum are established. The analysis of the factors influencing the strength of the SHS aluminium cast iron, the planned experiment for obtaining the maximum strength of SHS aluminium cast iron for two input factors varying at three levels and three parallel observations were carried out. The statistical processing of experimental results is performed. The mathematical model is obtained for the dependence of operational factors on the composition of the charge of the SHS process. The significance of the regression coefficients of the equation is determined. The adequacy of the obtained equation is checked for the results of observations. The analysis of the conditions for the formation of the microstructure of aluminium cast iron in the process of SHS-casting is presented

Iron oxide nanoparticles fabricated by electric explosion of wire: Focus on magnetic nanofluids

Nanoparticles of iron oxides (MNPs) were prepared using the electric explosion of wire technique (EEW). The main focus was on the fabrication of de-aggregated spherical nanoparticles with a narrow size distribution. According to XRD the major crystalline phase was magnetite with an average diameter of MNPs, depending on the fraction. Further separation of air-dry EEW nanoparticles was performed in aqueous suspensions. In order to provide the stability of magnetite suspension in water, we found the optimum concentration of the electrostatic stabilizer (sodium citrate and optimum pH level) based on zeta-potential measurements. The stable suspensions still contained a substantial fraction of aggregates which were disintegrated by the excessive ultrasound treatment. The separation of the large particles out of the suspension was performed by centrifuging. The structural features, magnetic properties and microwave absorption of MNPs and their aqueous solutions confirm that we were able to obtain an ensemble in which the magnetic contributions come from the spherical MNPs. The particle size distribution in fractionated samples was narrow and they showed a similar behaviour to that expected of the superparamagnetic ensemble. Maximum obtained concentration was as high as 5 % of magnetic material (by weight). Designed assembly of de-aggregated nanoparticles is an example of on-purpose developed magnetic nanofluid. Copyright © 2012 Author(s)

SHS-Ferrosilide Anode-Grounders for Electrochemical Corrosion Protection

© 2017 Springer Science+Business Media New YorkA method for producing castings of anode-grounders by recycling fine wastes from engineering enterprises during self-propagating high-temperature synthesis is proposed. A mathematical model for the dependence of the SHS-ferrosilide operating properties on the starting components is obtained using experiment planning. Results of analytical experiments are presented

Magnetic properties and giant magnetoimpedance effect for CoFeMoSiB surface modified amorphous ribbons covered by water based ferrofluid

Giant magnetoimpedance (GMI) effect is a powerful technique for magnetic label detection. Co-based amorphous ribbons are cheap materials showing high GMI effect at low operation frequencies for close to zero magnitostriction compositions. In this work magnetic properties and GMI were studied for CoFeMoSiB amorphous ribbons in as-quenched and surface modified states without and in the presence of water-based ferrofluid with electrostatic stabilization of γ-Fe2O3 nanoparticles. Surface modification by ultrasound treatment resulted in appearance of round defects with average diameter of about 150 micrometers. The GMI difference for as-quenched ribbons in absence and in the presence of ferrofluid was measured for the frequency range of 0.5 to 10 MHz. Although proposed surface modification by the ultrasound treatment did not improve the sensitivity limit for ferrofluid detection, it did not decrease it either. Observed changes of GMI are useful for understanding of functionality of GMI biosensors. © 2018 The Authors, published by EDP Sciences.The work was supported in part by the Government of the B is acknowledged for financial support under th e Elkartek Program, the Project Micro4Fab (KK -206/01 30)00 and the Ministry of dE ucation and Science of the RF Project N 055 , within the state job 3.21.61 20/17.9 . We thank I.V. Beketov , A.I . Medvedev and A. Larr anga for special support. Selected measurements were made at SGIKER services of .UPV/EH