Thermal Stability and Vibrational Properties of the 6,6,12-Graphyne-Based Isolated Molecules and Two-Dimensional Crystal.

We report the geometry, kinetic energy, and some optical properties of the 6,6,12-graphyne-based systems. We obtained the values of their binding energies and structural characteristics such as bond lengths and valence angles. Moreover, using nonorthogonal tight-binding molecular dynamics, we carried out a comparative analysis of the thermal stability of 6,6,12-graphyne-based isolated fragments (oligomer) and two-dimensional crystals constructed on its basis in a wide temperature range from 2500 to 4000 K.

Rapid and Effective Way to Synthesize Highly Crystalline Nanosized SAPO-34 Particles.

SAPO-34 nanocrystals with sizes of 50-150 nm were obtained via steam-assisted crystallization (SAC) for 5 h at 200 °C from two types of aluminum precursors-aluminum isopropoxide and boehmite. A reaction mixture composition with a small amount of organic template tetraehylammonium hydroxide (TEAOH) was used with the molar ratio TEAOH/AlO = 1/1. The alumina precursor type and duration of the SAC (5 and 24 h) on the crystal size, texture, and acid properties were investigated.

[Pharmacoepidemiological research of COVID-19 in the Russian Federation EGIDA-2020].

Aim: An analysis of coronavirus infection in Russia and evaluation of different AVT regimens effectiveness.

Materials And Methods: The study involved a retrospective analysis of 1082 patient records with laboratory-confirmed COVID-19 in 17 regions of Russia. The number of men and women was equal, mean age 48.

[Characteristics of thinking recorded in experimental psychological studies of young people].

Aim: To identify the features of thinking of young people, whose mental development was carried out in conditions of life virtualization (in a networked society).

Material And Methods: The study included 310 mentally healthy respondents, aged from 18 to 20 years, who study in universities of St. Petersburg.