Dynamics of Crystal Lattice With Non-Tetraedrical Site in Keating Model

Abstract

The work investigates the applicability of the Keating Model to estimation of the crystal lattice dynamics with the atomic coordination different from that of tetrahedral. The general model statement is considered in view of the long-range pattern of Coulomb interaction, software support of estimations with total consistency and accuracy assessment in terms of test systems to be standard for the Keating Model, and calculation results are given with the analysis of the crystal phonon spectrum structured like the mineral salt and fluorite. It is shown that the best choice of the model parameters will result in values for compounds of the structure above that are well consistent with experimental data, including acoustic vibration frequency range, where the Keating Model normally results in the increased values thereof.

Assessment of the social target program

“…The final stage of the implementation of the PCM is to evaluate the effectiveness of the implementation of the target program. One of the possible methods that allows you to evaluate the results of the implementation of the target program is to build an EMM of the dependence of the quality indicator on the resource indicator [6]. The main indicator of quality in CPU is the number of cases of HIV infection and AIDS deaths.…”

Preparation, Microstructure and Compressive Properties of Silicone GEL/SiC Composites for Elastic Abrasive

“…Silicone gel is a kind of high activity adsorption material, whic belongs to amorphous materials with a larger specific surface area and stronger mechanical strength. Its chemic formula is [Si 2 O•mSiO 2 ], which is a kind of polar material [15][16][17][18][19][20] . In the preparing process of the elastic abrasive the abrasive particles are treated with the surface modification agent, for the purpose of the characteristics of th polarity attraction of silicone gel.…”

“…As a cu off point of fore the extreme, the compression change is relatively flat, in turn, increases quickly. That is to sa [15][16][17][18][19][20]. In the preparing process of the elastic abrasives, the abrasive particles are treated with the surface modification agent, for the purpose of the characteristics of the polarity attraction of silicone gel.…”

“…The crystal structure of SiC is hexagonal crystal structure compound with covalent bond priority. The migration process of electrons in the outer layer of the SiC atoms in the migration of S P atom leads to a stable energy SP3 hybrid arrangement when SiC crystals formation with the carbon and silicon elements interacting with each other [18][19][20]. This will form a diamond structure of SiC with octahedral (symmetric tetrahedral) structure.…”

Magnetic control of structural changes in structural steels during plastic deformation

“…A negative impact on the performance of elements of welded metal structures is also exerted by local zones of stress concentration (SC) that arise during long-term operation, where plastic deformation is observed to one degree or another. Some unfavorable factors that contribute to the initiation and development of cracks and, as a result, lead to failures and serious accidents, are undoubtedly one of the main reasons for the decrease in the reliability and safety of operation of welded metal structures in general [1][2][3][4][5].…”