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The influence of fertilisation on the water-salt regime in the conditions of the Mugan-Salyan massif, Azerbaijan

Mustafayev Mustafa, Tukenova Zulfiya, Alimzhanova Mereke, Ashimuly Kazhybek, Mustafayev Farid

Journal of Water and Land Development

2022

no. 55

276--285

The article presents research data on the amount of salts in the irrigated soils of the Mughan-Salyan massif, their composition, water-salt regime, and their forecast. It was found that the soils on the territory of the massif were saline to varying degrees. In general, the area of non-saline soils in the massif is 125,650 ha, mildly - 272,070 ha, moderately - 210,560 ha, highly - 125,850 ha, very highly - 109,450 ha and saline soils - 27,520 ha. The absorbed bases in the soils of the massif were studied, and it was determined that they change depending on the amount of salts as follows: in mildly saline soils, Ca - 57.82-68.31%, Mg - 25.26-36.28%, Na - 5.49-6.43%; in moderately saline soils - 56.77-65.76%, 27.03-35.58%, 7.12-7.94%, respectively; in highly saline areas - 54.05–64.75%, 24.94-43.67% and 9.19-14.42%. As you can see, the soils are mildly and moderately saline. The soils in the surveyed areas are saline to varying degrees (i.e., the average value of salts in the 0-100 cm layer of the soil varies between 0.25 and 1.00%). The biological product used in these soils contains a wide range of macro and microelements, humic acids, fulvic acids, amino acids, vitamins and enzymes that do not contain BioEcoGum mineral fertilisers. This biological product was used for the first time and one of the main goals was to study the improvement of water-physical properties of soils after its use. Therefore, the water-salt regime of the soils of the study area was studied on three experimental sites selected for the area, the number of irrigations for different plants, and their norms were determined taking into account the depth of groundwater in the soils and shown in tabular form. They are widely used in farms and these regions, taking into account the proposed irrigation norms and their quantity.

Numerical simulation of dry gas migration in condensate gas reservoir

Sun Y., Zhu W. Y., Li B. Z., Xia J., Jiao Y. W., Huang K.

Journal of Power Technologies

2018

Vol. 98, nr 2

212--219

Dry gas overlies on condensate gases and flows due to the difference in density. This phenomenon affects cyclic injection exploitation and increases production costs. A mathematical model of dry gas migration was developed in this study to investigate the migration characteristics and the overlying law for dry gas in the condensate gas reservoir. On the basis of the theory of convection diffusion, the governing equations were constructed, using dry and condensate gases as two pseudocomponents. The distribution and transition belt of dry gas, as well as the effects of condensate oil and the perforation method on overlying of dry gas were discussed based on the dry gas migration model. The results demonstrate that the width of the transition belt of dry and condensate gases increases gradually over time. The mole fraction of gas in the transition belt is dense in the middle, but sparse at the two ends. The overlying of dry gas is easy, taking condensate oil into consideration. The value of F increases by 0.32, but the width of the transition belt becomes narrow. The transition belt under the top perforation of the reservoir is wider than that under symmetric perforation, and the overlying degree of dry gas increases. This study provides a theoretical foundation for in situ adjustment and optimization of cyclic gas injection utilization.

Modelling of distributed parameter nonlinear systems by differential Taylor method

Abbasov T., Herdem S., Koeksal M.

Control and Cybernetics

1999

Vol. 28, no 2

259-267

Modelling, solution, control and even design of many ecological and engineering systems involve dealing with nonlinear partial differential equations of which analytic solutions are rarely available and numerical approach with or without linearization, or approximation is inevitable most of the time. In this paper the possibility of analysing such systems by using a fairly new method known as Differential Taylor (DT) Transform and its advantages are proved. The results obtained by this method are compared with the experimental results and shown to be within good agreement with them. It is emphasised that DT Transform is not effective for only filtration systems, but can also be used equally well for absorption, heat and mass transfer, convective diffusion and similar systems.