Research and Innovation Activities – 2023

REPORT

on the scientific and scientific-organizational activities

of the Center for Innovative Development of Science and New Technologies

of the National Academy of Sciences of Tajikistan in 2023

Project: "Research and development of innovative technologies for the production of electric and thermal energy, seasonal energy supply from renewable energy sources and provision of recommendations on the practical aspects of their use" RD No. 0123TJ1513.

Project manager: Academician of the National Academy of Sciences of Tajikistan, Doctor of Physical and Mathematical Sciences M.I. Ilolov

Research and Innovation Activities

1.1 Main results of scientific research

During the reporting period, research continued on the theory of stochastic differential equations and their applications. In particular, new results were obtained for the equations of porous media. An important example of such media is a geothermal reservoir with stochastic characteristics such as porosity, permeability, temperature and pressure. Some of the research results were presented at the 48th Stanford Geothermal Symposium (USA), the Eighth International Conference on Stochastic Methods (ICSM-8) and the Voronezh Winter School of Mathematicians - 2023. A mathematical model of fluid dynamics in a fractured-porous medium was created (using the Khoja Obi Garm hydrogeothermal system as an example). The solvability conditions for stochastic differential equations were determined using the fractional Laplacian and Balakrishnan white noise. (Ilolov M., Rakhmatov J.Sh.).

The effect of divalent ions Mg2+, Zn2+, Cd2+ and Sr2+ on enhancing the photoluminescence intensity of the oxide material CaAl12O19 doped with Mn4+ ions was studied using experimental and theoretical methods. All these samples were synthesized by the solid-state reaction method, and their crystal structure was studied by X-ray diffraction. A significant enhancement of the photoluminescence intensity was observed with the addition of Mg2+ and Zn2+ compared to the CaAl12O19 sample doped with Mn4+ ions (monodoped). The results showed that the samples doped with Cd2+ and Sr2+ ions do not contribute to such an enhancement of the photoluminescence intensity. In order to clarify the mechanism of such enhancement of photoluminescence upon co-doping with divalent ions, a study was carried out on the change in the local environment of the Mn4+ ion in CaAl12O19 both experimentally using the analytical EPR method and theoretically using density functional theory calculations. The EPR spectra demonstrate significant changes upon co-doping with Mg2+ and Zn2+ ions, whereas no such difference is observed in the spectra of the samples doped with Cd2+ and Sr2+ ions. Density functional theory calculations and EPR measurement results show that the addition of Mg2+ and Zn2+ ions significantly changes the local environment of the central Mn4+ ion, while the effect of Cd2+ and Sr2+ ions is very small. Changes in the local environment of the central ion lead to an increase in the photoluminescence intensity. In conclusion, it should be noted that the choice of additional divalent ions that take the place of the Al3+ ion in the CaAl12O19 structure can be carried out by comparing their ionic radius with the Al3+ ion, and these ions affect the local environment of the central Mn4+ ion in CaAl12O19. structure that enhances the photoluminescence intensity. (Ilolov M., Kurbaniyon M.)

Development of innovative systems for storing solar radiation energy in enclosing materials of buildings and structures (walls, roofs, floors).

The physical parameters and temperature characteristics of the device - a solar collector (SC) for storing solar energy - are calculated. The air-cooled CO was developed based on the research materials of the solar collector panel (SCP). The area of ​​the CC is 3 m2, the length is 244 cm, the width is 122 cm. There are two ways to install the CC on the surface of the enclosing structures (ES): vertical installation of the CC along the length or along the width. The space between the windows, above and below them is completely glazed with KO. The elements of the device: a transparent cover, a radiator, a heat-insulating layer, heat input and output devices. The elements are placed according to the description of the invention of the Central Heating Plant for heating buildings and structures and the first patent.

The technical effect is achieved by increasing the heating level and improving the thermal insulation of the air ducts.

The design peak capacity of the CHPP is 3 kW, the average capacity is 1 ... 2 kW during the heating season from October to April. The design thermal efficiency of the CO is 66%.

The design of the KO body is based on anti-corrosion profiles for strengthening the elements and installing the KO on the surface of the CM. A scale model was made to test the operation of the central heating system.

Development of an automatic control (monitoring) device for the thermal mass and microclimate of buildings and structures. The device is a device for measuring temperature, built on the basis of a microcomputer and having a memory unit for recording measurement results.