Вестник Башкирского университета

Modeling of gas production from gas reservoir with horizontal permeability anisotropy through the fractured wells

Mukhametova Zulfiya Samatovna, Kovaleva Liana Aronovna — Tue, 05 Aug 2025 00:00:00 +0000

In this paper, the influence of horizontal permeability anisotropy of low-permeability gas formation on the gas filtration process
and gas production through fractured wells is investigated. The simulation of gas flow to fractured wells in an element of gas reservoir with a low-permeability has been performed. The formulation of the problem takes into account the changing of the gas properties using the Peng-Robinson equation of state. The dynamics of gas production rate is obtained for various ratios of the horizontal anisotropy of the reservoir permeability; the changing of gas properties and pressure in the “fractures – reservoir” system is considered

The effect of synergism in the reaction of initiated oxidation of ethylbenzene by additives of nitroxyl radical and α-naphthylamine

Garifullina Garifa Gubaidullovna, Nasretdinova Rimma Nailevna — Tue, 05 Aug 2025 00:00:00 +0000

The inhibitory properties of three stable nitroxyl radicals and α-naphthylamine were studied. The ability to reduce the rate of ox-
idation of ethylbenzene is determined by the value of the effective inhibition rate constant and the capacity of the inhibitor. All of the binary compositions of the nitroxyl radicals with α-naphthylamine exhibited enhanced inhibitory properties

Studying the properties of film materials based on mixtures of polylactide. Chitosan and antibiotic

Tue, 05 Aug 2025 00:00:00 +0000

The work is devoted to the study of the properties of compositions obtained on the basis of polylactide, chitosan and ceftriaxone. materials on the basis of which are intended for the protection and treatment of long-term non-healing wounds. It is shown that despite the fact that film compositions are obtained by melt processing at elevated temperatures, they are characterized by high microbiological activity against Staphylococcus aureus. It has been established that by adjusting the content of ceftriaxone and chitosan in the composition, it is possible to regulate the absorbing capacity of the material, the rate of its hydrolytic destruction, the rate of antibiotic release from the film coating, as well as the values of physical and mechanical parameters such as breaking elongation, elastic modulus and breaking stress

Synthesis of siloxy derivatives of ascorbic acid

Shatirova Mahruza Ismailovna — Tue, 05 Aug 2025 00:00:00 +0000

The methods of the synthesis of siloxy-derivatives of ascorbic acid are developed, based on the interaction reactions of ascorbic
acid and its bromine- and dioxolane-containing derivatives with trialkyl(phenyl) ethoxysilanes in the presence of silicon tetrachloride in a medium of ethyl alcohol. The yields of the purposeful products are quite high and are 75–85%. The structures of the synthesized compounds are confirmed by IR and NMR 1H and 13C spectroscopy. The synthesized compounds are optically active and have a positive (+) rotation sign

The synergistic effect investigation in composite demulsifiers

Semikhina Ludmila Petrovna, Kovaleva Irina Vladimirovna — Tue, 05 Aug 2025 00:00:00 +0000

In this paper on the example of water-oil emulsions composite demulsifiers, the possibility of detecting a synergistic effect in their
compositions using dielectric measurements is shown. This method avoids time-consuming demulsification tests on water-oil emulsions

Quantum chemical calculation of thermodynamic parameters of iodine-ion oxidation system

Tue, 05 Aug 2025 00:00:00 +0000

It is relevant to use the oxidation-extraction method to extract halogens from natural waters; however, the control
of the method should be carried out potentiometrically. The innovative solution presented in the article is the use of quantum chemical calculations to calculate the thermodynamic parameters of the iodide ion oxidation reaction and related processes, including interfering ones. The quantum chemical calculation was carried out in the UHF/LANDZP approximation. The main parameters for the calculation were the change in the Gibbs free energy and the EMF of the reaction. The data were analyzed by comparing theoretical data on the Purbe diagram, quantum chemical calculations and experimental results of oxidation. The obtained data can be used to predict the content of halide ions by express methods, as well as to optimize the processes of iodine extraction from aqueous solutions

Determination of carotenoid composition of large-fruit pumpkin type by spectrophotometry and thin-layer chromatography methods

Gainullina Yuliya Yuryevna, Savenkova Irina Alexandrovna — Tue, 05 Aug 2025 00:00:00 +0000

In this work, using spectrophotometry and thin-layer chromatography, it was established that domestic varieties of large-fruited pumpkins contain carotenes and xanthophylls. It was determined that β-carotene is present in all the studied varieties. Moreover, its content was identified in all parts of the pumpkins. However, α-carotene is contained only in two varieties. It was shown that the color of the pumpkin affected by the content of such carotene as lycopene. Of all the samples studied, lycopene was identified only in one variety. It was found that all the studied pumpkin samples contain xanthophylls both in the peel and in the pulp. Lutein was identified in all parts of the studied pumpkin varieties. It is suggested that all the studied pumpkin varieties can be raw materials for the extraction of carotenoids

Synthesis of 2,6-dialkenyl-4-alkoxyarylamines

Tue, 05 Aug 2025 00:00:00 +0000

For the first time, di-ortho-alkenyl substituted derivatives of para-anisidine and para-phenethidine were synthesized. 4-Chloro-
2-pentene and 3-chlorocyclopentene, hydrochlorination products of piperilene and cyclopentadiene, respectively, were used as alkenylating agents. It was demonstrated that the reaction could be performed in one or two stages. The obtained compounds were found to be effective inhibitors of acid corrosion of steel