Intensity and width of bragg reflections from imperfect icosahedral quasicrystals obtained by simulating atomic growth.

International audienceThe Bragg reflections from icosahedral quasicrystals obtained in the course of a computer experiment on the simulation of crystal growth have been studied. The computer experiments based on the theory developed earlier allow one to “grow” in a computer the imperfect quasicrystals of nanometer dimensions. It is shown that the absolute value of the structure factor can be close to the maximum possible one for crystals, i.e., to the structure factor in the case where all the atoms scatter in phase. The spectral width of Bragg reflections is studied, and it is shown that the reflection width depends not only on the quasicrystal dimensions in the physical space but, also, on the perpendicular component of the reciprocal-lattice vectors. The data obtained are compared with the known experimental data

Microwave Radiometry of the Pelvic Organs

The problems of designing a microwave radiometer for thermal monitoring of pelvic organs were considered. Based on mathematical modeling, a waveguide antenna for intracavitary diagnostics was developed. The antenna was tested in various phantoms and biological tissues. The obtained results can be used in various fields of medicine and robotics. © 2019, Springer Science+Business Media, LLC, part of Springer Nature