In order to prevent surface adhesion processes between the two friction surfaces and to reduce static friction coefficients, it is proposed to treat them with laser irradiation and doping with graphene nanoplatelets. The effects of laser irradiation modes on the depth and structure of the modified surface layers were investigated. It was shown that by remelting the surface with laser radiation it is possible to obtain a metal layer with a fine microstructure and sufficiently high hardness. The doping with graphene nanoplatelets made it possible to block the uneven grain growth of the matrix phase of the coating and ensure its homogeneity. An examination of the parameters of the obtained coating after laser remelting shows their sensitivity to changes in the scanning speed of the laser beam on the surface. This makes it possible to control the properties of the surface layers.
In the evidence-based diagnosis of nasal breathing disorders and the planning of corrective surgical procedures, it is not sufficient to examine only the general characteristics of airflow - averaged values of aerodynamic parameters such as airflow rate, pressure drop, and aerodynamic nasal resistance. It is necessary to investigate the effect of airflow on the mucosa at the micro level, which, when pathological conditions develop, leads to excessive drying of the nasal cavity surface. To do this, it is necessary to compare the width of the laminar boundary layer – the parietal region, where the maximum change in airflow velocity is observed, and the height of the nasal mucosa irregularity. The calculated values of the laminar airflow boundary layer were obtained from model representations of the complex spatial configuration of the nasal cavity using a circular channel of equivalent diameter.
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