Vol 17, No 4 (2023)

From May 22 to 26, 2023, the 23rd international specialized exhibition “Equipment, instruments and tools for the metalworking industry” - “Metalworking-2023” was held in Moscow at the Expocentre Fairgrounds.

To study the nature of greenhouse gas variations, a hardware and software complex has been created, consisting of the 52.5-meter laser strainmeter, the 17.5-meter laser strainmeter, the laser nanobarograph and the mobile laboratory Research Vessel “Professor Gagarinsky”, consisting of an atmochemical measuring complex (Picarro gas analyzer), the complex of meteorological instruments on the upper deck of the bridge, the vessel’s gas analysis laboratory and the flow-through system. When processing experimental data on variations of deformations of the upper layer of the Earth’s crust and variations of atmospheric pressure at Shultz Cape, and in the analysis of variations of methane, carbon dioxide and water vapor in the near-water atmosphere on the shelf of the Sea of Japan at a distance of about 2 km from Shultz Cape, general patterns were established in the behavior of the studied parameters of the upper layer of the Earth’s crust and the near-water layer of the atmosphere in the infragravity range. The general powerful oscillations with periods from 7 min 59.1 s to 7 min 45.5 s, 28 min 28.8 s, from 30 min 07.6 s to 31 min 59.1 are identified, the primary source of which can be associated with both atmospheric processes and the main (radial) tone of the Earth’s own vibrations 0S0.

The article describes the design of the pancratic erecting system that allows to expand the range of magnifications in the optical sight up to 5–8 times and obtain a high-quality reticle image when using the illumination.

A procedure for developing a detection method using a passive optoelectronic system of an unmanned aircraft against a complex background formed by atmospheric radiation in the far infrared range (8–13 microns) is proposed. The atmospheric background on which the unmanned aircraft is detected is formed by the radiation of the cloudy atmosphere when observed from the Earth’s surface. Of particular interest is the complex background created by cumulus clouds of different scores or other classes of clouds with discontinuities. The following assumptions are accepted: a short-focus optoelectronic system has a wide field of view, video information about the artifact and background characteristics is presented in binary form. The processed video stream is a two-dimensional array, the elements of which contain information about the level of energy brightness of radiation in the selected direction. The emphasis is on the need to monitor changes in the structure of the emitting background and the absence of the need to process each frame of the video stream.

The paper presents the study results relating to the material state of the implants made of titanium alloy and coated with chitosan. The implants have been studied before and after preclinical use in animals. A feature of this research method is the use of Raman scattering spectroscopy with a high sensitivity in the region of 400^–1 800 cm⁻¹. Confirmation of the implant surface study results was obtained using the scanning electron microscopy. The details of spectral changes are taken as an indirect estimate of the complete biodegradation of the implant coating after one month.