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

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)

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

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

An evolution equation as the WKB correction in long-time asymptotics of Schrodinger dynamics

We consider 3d Schrodinger operator with long-range potential that has short-range radial derivative. The long-time asymptotics of non-stationary problem is studied and existence of modified wave operators is proved. It turns out, the standard WKB correction should be replaced by the solution to certain evolution equation.Comment: This is a preprint of an article whose final and definitive form has been published in Comm. Partial Differential Equations, available online at http://www.informaworld.co