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Theoretical bases of impregnation without pressure of meliorants and the application of their features in practice of fixing mobile sands

Mirakhmedov Makhamadjan

Transport Problems

2020

T. 15, z. 4, cz. 1

39--48

Desert sand is subject to deflation, which during the construction and operation of railways in the sandy desert leads to the filling of the railway track with sand and erosion of subgrade. To prevent this phenomenon, the surface of the sand is fixed with a binder, which is sprayed onto a deflated surface. The penetration of the working composition of the binder due to the characteristics of grinding is accompanied by an uneven distribution of the substance, which is proposed to characterize the saturation coefficient. Peculiarities of the interaction of the binder and sand from which the protective crust is formed are revealed, which made it possible to change the nature of the impregnation. Pre-wetting allows to reduce the pore space of sand, change the nature of the transfer of the substance when impregnated into the capillary, and increase the uniformity of impregnation, which as a result allows to obtain a resource-saving solution when fixing the movement of sand.

Biogas as an alternative fuel for automotive transport in mountain areas

Dykun T. V., Haieva L. I., Kozak F. V., Demianchuk Y. M.

Journal of New Technologies in Environmental Science

2018

Vol. 2, nr 4

149--155

The importance of the problem of effective use of traditional energy sources and the search for alternative resources is beyond doubt. However, nowadays Ukraine does not fully use the potential of low-calorie gases, in particular, biogas, produced by agriculture and industry in large quantities. The number of available domestic installations for the disposal of this gas is negligible although a great number of developed countries have thousands of such facilities. One of the most advantageous sources of energy is biogas produced out of biological waste from communal and agricultural dumps - landfill sites for waste disposal. It is meanwhile burnt in flares or emitted into the atmosphere contaminating it heavily. The level of biogas used as a fuel in automotive internal combustion engines is very low. However, replacing gasoline with biogas results in engine power reduction and fuel consumption increase. This should be taken into account when operating cars in mountainous areas where atmospheric pressure and temperature are lower.