sedimentation

The effect of cavitation phenomena excited by ultrasonic radiation and in a jet-type hydrodynamic cavitator on the change in the phase-dispersed state of hydrated calcium oxide was investigated. The influence of the conditions of cavitation activation of calcium hydroxide on the sedimentation stability of its suspension was established. Based on the analysis of the intensity of sedimentation of Ca(OH)2 particles after cavitation treatment of calcium hydroxide suspension, the probable course of this process in different time periods is proposed.

Purpose. The paper’s purpose consists in determining the source mechanism of 29.09.2017 earthquake near Stebnyk (21h46m8,4s, = 49,34˚, λ = 23,49˚, h = 1,9 км, MD = 2,9) using two methods – from polarities of first P-wave arrivals and by inversion of wave forms registered at a limited number of stations. Methodology. Seismic waves in the inhomogeneous medium represented by horizontally layered elastic structure are calculated using the matrix method.

Study of the dynamics of gas extraction depending on open porosity of rocks-reservoirs which are formed in different geological conditions of sedimentation indicates the three distinct modes of extracting gas: initial, where βh varies from 0 to 0.5, transition – βh=0,5-0,7 (for sarmatian collectors of Bilche-Volytsky zone of the Carpathian foredeep), βh=0.5-0.8 (for Visean collectors of Rudivsko-Chervonozavodsky deposits in the Dnieper-Donets basin) and βh=0.5-0.6 (for Miocene carbonate reservoirs of southern waters of Azov sea).

Target. Finding subordination of spatial distribution of hydrocarbon accumulation of different types because of region geodynamics.Methods. The main stages of sedimentary cover forming of Dniprovsko-Donetska depression have been characterized, geodynamic factors led to forming of paleolandscapes have been studied, paleogeomorphic and lithology-facial reconstructions have been done, peculiarities of sedimentation processes, forming of composition and structure of sedimentary complexes and distribution of hydrocarbon accumulation of different types there have been fixed. Results.

The influence of the molecular architecture and the composition of block copolymers on their solid-liquid interface behaviour were investigated in detail. For this purpose, the surface modification of hydrophilic titanium dioxide and hydrophobic copper phthalocyanine pigments in aqueous dispersion by a series of amphiphilic block copolymers has been studied.