VOL 88, No. 11 (2015)

Medicine needs means of targeted drug delivery. Microbeads have a wide range of applications in medicine and are used as a means of delivering radiation to human internal organs and drugs. The review describes methods for the production and use of glass microspheres, including radioactive ones, for the needs of medicine.

Using vibrational spectroscopy methods, a different effect of the addition of titanium on the structure of glasses of the K ₂ O? B ₂ O ₃? SiO _{2, differing in the ratio of boron and alkali metal content in their chemical composition. The obtained result reflects the change in the structural role of titanium in glass and is important for assessing the effect of adding titanium on the properties of alkaline borosilicate glasses in the process of improving matrix glassy materials used in the immobilization of radioactive waste.}

A three-component ceramic material based on the ZrO2 - SrTiO3 - BiScO3 system has been obtained, its phase composition, microstructure features have been established, and the temperature dependence of the electrical conductivity has been studied. It was found that at room temperature the material consists of a cubic phase with a space group of symmetry Fm3m, corresponding to the cubic modification of zirconium dioxide, and a solid solution consisting of a nonpolar cubic phase with Pm3m symmetry and a polar tetragonal phase with P4mm symmetry and characteristic of the two-component system ZrO ₂? SrTiO ₃? BiScO ₃. The presence of these phases is confirmed by the results of studying the microstructure and elemental composition of the samples by scanning electron microscopy. It was found that above a temperature of ~ 750 K, the specific electrical conductivity of the samples under study increases significantly

The cybernetic equation of the complex dielectric constant of the condensed sample is considered. The results of computer simulation of long-wavelength optical spectra of pure crystalline oxides, as well as the resulting spectral dependences of the electronic properties of the sample under study, are presented.

The possibility of synthesis of compositions and technology for the preparation and application of a gas-tight isotropic coating for the protection of special structural steels used in the manufacture of hydrogen power plants in order to increase their stability in hydrogen and reduce hydrogen permeability at temperatures up to 600 C is shown.

On the example of ordered packages of bulk media? balls considered a model of their structure? with cells in the form of conditionally cut (quasi-faceted) parallelepipeds, the vertices of which are located in the centers of eight adjacent granule-balls. Power-law and exponential dependences of the coordination number of a granule-sphere on the packing density of the medium are given. and its porosity?. For relatively narrow, typical for backfill environments, ranges? and ? more accurate linear and non-linear dependencies are presented

The possibility of obtaining crystals of lithium molybdate Li ₂ MoO ₄ from aqueous solutions activated by low-frequency oscillations of a chemically inert body is considered. It was shown that the activation of the solution leads to an increase in the equilibrium solubility of Li ₂ MoO ₄ in an aqueous solution in the temperature range 25 28 ° C. The effect of the activation of the solution on the faceting shapes of the grown crystals and the morphology of the facet surface has been established. It is shown that the activation of the solution leads to a decrease in the inclusion of water in crystals and an improvement in the surface quality of the growing crystal.

Within the framework of a quasi-static uncoupled problem of thermoelasticity for an isotropic plate, non-destructive modes of high-temperature laser annealing of optical ceramics KO-3 with CO2-laser radiation are determined . It is shown that non-destructive modes are provided only for a sufficiently long exposure time and a low power density of laser radiation. An experimental verification of the adequacy of the computational model has been carried out