Vol. 3 No. 7 (2021)

This article describes the e-learning education system, its history of creation, the relationship with the distance learning system and the advantages of the e-learning education system.

The process of separation of oil sludge, which is obtained after cleaning the oil refining units of the Bukhara oil refinery, is presented. Methods of obtaining petroleum liquid rafinate using several experimental laboratory installations for liquid-phase separation of oil sludge in a centrifugal force field with the use of a deemulgator "Disolvan-4411" and sawdust from the processing of old furniture of local raw materials are used. The composition and amount of heavy sediment and clarified oil products from oil sludge were obtained

The organization of any activity requires an initial investment of funds for the purchase of buildings, raw materials, labour, and so on. This is done through investment. This article discusses investments, the task of their statistical study, investment activity, investment structure, capital investments, financial and non-financial assets and their efficiency.

Humic substances are the main organic component of soil and water, as well as solid fossil fuels. These important components are formed during the de-composition of plant and animal residues under the influence of abiotic envi-ronmental factors and as a result of the activity of microorganisms. In the future, humic substances are of great interest for medicine, veterinary medicine and plant protection as bioregulators, biostimulants and adaptogens, which deter-mine the normal functioning of various body systems. As a result of enrichment of coal from the Angren deposit, a large amount of waste accumulates, which negatively affects the ecological situation in the region and occupies large areas, in connection with which the question of their processing arises, in particular, to obtain humic preparations and bacterial fertilizers of prolonged action. The iso-lation of humic acids from the dumps was carried out with weak solutions of po-tassium and sodium hydroxides, and then precipitated from the obtained alka-line extracts by acidification with mineral acids to pH 2.0. In the residual cakes, the synthesis of humic acids was carried out by inoculation of an association of microorganisms BK 5 grown on rice flour. In the course of the research it has been found, that optimal separation of humic acid alkali consumption solvents NaOH or KOH is 8g per 100g of the crude product in a ratio of T:F = 1:5 at a temperature of 80° C for 30 minutes.

The article presents some applications of the matrix function and group action to reveal some properties of matrixes and p-groups.