Ultrasonic soldering in electronics.

Ultrasonic (US) soldering of electronic components, as an alternative to flux soldering, is environmentally friendly, improves the quality of soldered connections at the mounting elements after long-term storage, and allows the use of lead-free solders. Methods of US solder melt activation, lead-free solders in US soldering and glass-ceramic capacitor metallization processes have been investigated.

[A study of the effect of radiation on megakaryocytopoiesis using a mathematical model].

Mathematical modelling used in analysing the postirradiation changes in megakaryocytopoiesis permitted to determine the level of radiation-induced injury in each experiment conducted and to show that megakaryocytopoiesis regulation followed the same mechanism after irradiation as it does normally and after the effect of hydroxyurea and anti-thrombocyte serum. The analysis has demonstrated that after the stem cell death induced by ionizing radiation, the regeneration can be provided by the committed cells, and the level of regeneration is determined by the maturity of precursors.

[Purification of biological fluids by sorbents on a base of industrial activated charcoal].

The authors propose using industrial activated carbon as a base for hemosorbents and show the methods of choosing the optimal size of the sorbent grain. The results of using the column with a pseudo-liquefied layer and the apparatus with an unfixed layer of hemosorbent are given. Using enterosorption was proposed for the treatment of a number of disorders including allergic diseases.