ANALYSIS OF THE EMOTIONAL BEHAVIOR OF USERS OF SITES BASED ON NEURAL NETWORKS

Create a neural network capable of predicting the emotional coloring of a comment

On the impact of the plasma jet energy on the product of plasmadynamic synthesis in the Si-C system

Silicon carbide (SiC) nanoparticles can be used for ceramics reinforcement, creation of nanostructured ceramics, microelectromechanical systems. The paper presents the results of plasmadynamic synthesis of silicon carbide nanopowders. This method was realized by the synthesis in an electrodischarge plasma jet generated by a high-current pulsed coaxial magnetoplasma accelerator. Powdered carbon and silicon were used as precursors for the reaction. Four experiments with different energy levels (from 10.0 to 30.0 kJ) were carried out. The synthesized products were analysed by several modern techniques including X-ray diffractometry, scanning and transmission electron microscopy. According to analysis results all the products mainly composed of cubic silicon carbide (b-SiC) with a small amount of unreacted precursors. Silicon carbide particles have a clear crystal structure, a triangular shape and sizes to a few hundred nanometers. Comparison of the results of experiments with different energy levels made it possible to draw conclusions on ways to control product phase composition and dispersion. The silicon carbide content and particles sizes increase with increasing the energy level

Plasmadynamic synthesis in the Si-C-N-O system

The present work is aimed at studying the possibility of synthesizing nanodispersed particles in the Si-C-N-O system and then studying the resulting synthesis products. Three series of experiments were carried out under different atmospheres of the reactor chamber: air, air + argon, argon. The possibility of synthesis of particles of the ternary Si-C-N system was considered. In the course of the study, it was found that, in the air atmosphere of the reactor chamber, the production of silicon carbonitride particles is not feasible due to the oxidation of precursor phases. The result was the production of nanodispersed particles of cubic silicon carbide, which were obtained by the method of plasmadynamic synthesis in a hyper-velocity jet silicon-carbon plasma. The obtained products were subjected to a thermal analysis. During the thermal analysis, the most optimal annealing temperature range was found to be 600-700 °C. Annealing at this temperature in air allows the synthesis product to be eliminated from the unreacted carbon phase

Optimization of the TiB2 plasma dynamic synthesis

Titanium Diboride (TiB2) nanoparticles were obtained by plasma dynamic synthesis in a hypersonic plasma jet. The aim of the work was to optimize synthesis of TiB2 nanoparticles. Firstly, three series of experiments with different ways of a discharge initiation were implemented: 1) using titanium conductors; 2) using carbon fibers; 3) using graphite aerosol (graphitization). Secondly, experiments with different atmosphere gas, which filled the volume of the reactor chamber - Ar and N2 were implemented. Thirdly, there were experiments with different mass ratio of Ti:B precursors using graphitization (26.7:73.3; 45.5:54.5; 61.1:38.9; 86.4:13.6). And finally experiments with 16.9 kJ released energy were implemented. The results showed, that the best of way of initiation an arc discharge is graphitization using Ar with mass ratio Ti:B 26.7:73.3 and input energy − 33.9 kJ. The yield of TiB2 was 93.2% with the smallest particles 56.1 nm