The influence of low-intensity non-thermal electromagnetic waves of the millimeter range on the surface and volume properties of water, saline, and DNA solutions was studied. It is demonstrated that non-thermal millimeter electromagnetic waves (MMEMW), which coincide in frequency with the resonant frequencies of water structures’ oscillations, produce a specific effect in vivo and in vitro [1–3], affecting living organisms through the aqueous component of their environment. The non-thermal EW is not absorbed by the surface layer of aqueous solutions and penetrates the deeper layers of liquid, leading to the dehydration of salt ions and DNA, and an increase in the density of the aqueous solutions. Irradiation of DNA solutions with low-intensity resonance frequencies for aqueous molecular structures for 90 minutes leads to an increase in the thermal stability of DNA by approximately 1°C. As the temperature increases, the density of non-irradiated and irradiated solutions decreases. However, there is a significant difference between the behavior of density dependence on temperature for non-irradiated and irradiated saline and DNA solutions. Calculations show that for studied solutions, the coefficient of thermal expansion (α) increases with increasing temperature, and the growth of α occurs differently for water structures irradiated and not irradiated with resonant oscillation frequencies.
By doping zinc with transition metals (Ag + Fe + Cu), the following targets were formed: Zn/Ag/Fe/Cu (Zn95, Ag2, Fe2, Cu 1
The effect of an electric field on a graphite coating deposited on an aluminum plate was studied experimentally. The experiments were made under electrolysis conditions, and ordinary water was used as the electrolyte. Samples of aluminum plates with graphite coatings served as the cathode and anode. The electrodes were tested under the influence of electric pulses with a sharp front. After exposure to the electric field for 72 hours, changes in the integrity of the cathode coating were observed. No changes were detected on the surface coating of the anode. Using a scanning electron microscope equipped with an energy-dispersive X-ray microanalysis system, the chemical composition of the cathode surface coating was analyzed before and after the electric pulses’ influence on the electrolyzer. A significant degradation of the graphite coating structure on the aluminum plate was recorded as a result of the electric field exposure. A possible physical mechanism of carbon transformation on the graphite coating of the aluminum plate under the application of a negative electric field is presented.
A hydrothermal-microwave method for the synthesis of cadmium metasilicate was developed using water-soluble cadmium compounds and sodium silicate, demonstrating enhanced efficiency compared to conventional thermal techniques. The synthesized product, cadmium metasilicate, is a nanodispersed powder with high photocatalytic activity and radiation resistance. The physicochemical properties of the synthesized cadmium metasilicate were investigated using differential thermal analysis, X-ray diffraction, UV–VIS and IR spectroscopy, as well as electron microscopy. The results showed that the band gap (Eg) of the synthesized powder, depending on the heat-treatment temperature and proton irradiation, varies in the range of 5.06–5.46 eV. The material obtained by the proposed method can be used as a dielectric, a photocatalyst, and for protection against ionizing radiation.
A theoretical evaluation of the activity of the medical radioisotope 68Ga produced by cyclotron irradiation of zinc targets via the 68Zn(p, n)68Ga reaction has been performed. Using SRIM/TRIM, proton energy losses in the target material and the dependence of proton energy on target depth (thickness) were determined. Effective cross–sections σ(E) for the 68Zn(p, n)68Ga reaction were obtained using the TALYS 1.9 code. It was established that the optimal proton energy range (12.5–4.6 MeV) provides a high theoretical product yield while minimizing side reactions. For irradiation of natural and enriched zinc targets, the calculated theoretical yields were 0.82 and 4.36 GBq/(μA h), respectively, which agree with literature data. The results obtained can be used to optimize the technical parameters for the production of 68Ga for medical applications.
