A.S. Pushkin Brest State University

Addressing the issues of sudden range reduction and lifespan degradation in agricultural drone lithiumion batteries due to temperature runaway during high-temperature operations, this paper proposes an optimization method for an electric drive battery power supply system. The study initially constructs a battery thermoelectric coupling model to analyze the dynamic relationship between power demand and temperature rise during typical spraying operations. Subsequently, an intelligent thermal management system is designed, which combines active air cooling and phase change material (PCM) cooling strategies and is controlled by an innovative dynamic threshold algorithm. To further enhance system performance, the discharge current curve is optimized using the Particle Swarm Optimization (PSO) algorithm, achieving a better balance between power output and thermal generation. Experimental verification under 35°C environmental conditions shows that the battery peak temperature decreases from 58°C to 49°C, representing a % reduction in the maximum operating temperature. Field tests indicate that the system extends the durability of a single operation by 14 %, while significantly improving the service life, with a capacity retention rate of 92.3 % after 100 charge-discharge cycles, compared to 85.1 % for traditional systems. These results demonstrate that the proposed method effectively addresses the thermal challenges of drone batteries by coordinating and optimizing cooling strategies and discharge management, providing a practical, cost-effective solution for maintaining battery performance in hightemperature agricultural applications, while extending service life and operational reliability.

Let G = 1 be a nite group and let P be the set of all primes.A chain 1 = M 0 < M 1 < . . .< M n-1 < M n = G such that M i is a maximal subgroup of M i+1 for every i is called a maximal chain of G. Every chain is associated with a sequence of nonnegative integers j 1 , j 2 , . . ., j n , where j i = |M i : M i-1 |.A maximal chain is a P-chain if j i P for every i.We say that a P-chain is a P < -chain (P > -chain) if j 1 j 2 . . . j n (j 1 j 2 . . . j n , respectively).We investigate nite groups in which some maximal chains are P-chains.In particular, we obtain the following criteria for nite groups to be supersolvable: a group G is supersolvable if and only if there are a P > -chain and P < -chain in G; a group G is supersolvable if and only if G has a Sylow tower of supersolvable type and there is a P < -chain in G.The obtained results are used for characterization of generally supersolvable groups.

The paper studies one of the urgent problems of current higher education – the training of a new specialist’s generation. The authors reveal the concept of a competitive specialist with professional communicative competence. They pay special attention to the need for future specialists to develop foreign language communicative competence within the “discourse – communication – cross-cultural professional collaboration” paradigm. In this regard, particular attention deserves the formation of discursive competence as a component of the professional communicative competence of a specialist. It is considered that a university graduate knows various types of discourses and their characteristics, knows the methods of their construction and perception in specific areas and communication scenarios. The authors provide examples of training in foreign language professional communication based on modern methods and techniques of teaching foreign languages (for example, a training project, visual means, and text work). The authors conclude that in current conditions, a competitive specialist needs to demonstrate readiness for cross-cultural communication activities using a foreign language in international professional and business relations.

The article describes the experience of creating GIS portals as a platform for combining the results of scientific and educational activities of students of A. S. Pushkin Brest State University. GIS portals allow to combine large amounts of various types of information (descriptive, cartographic, graphic, photographic) and present it in a systematic way. The paper presents the experience of systematizing thematic geospatial information on the example of creating four GIS portals: &amp;quot;GIS portal of the Brest State University named after A.S. Pushkin&amp;quot;, &amp;quot;Urbanological GIS platform of Brest&amp;quot;, &amp;quot;GIS portal of the student research group &amp;quot;Constructive geography and GIS”, “Educational GIS platform for schoolchildren”. For each GIS portal, a description of its thematic structure (main sections and subsections), as well as structural elements (web applications, video materials, text descriptions, hyperlinks, etc.) is provided. GIS portals were implemented using various technologies: a website builder or a template for mapping web applications. The implemented GIS portals make it possible to combine a significant number of cartographic GIS products made by students. These GIS products are systematized on the portal pages by type, subject, purpose, GIS template and other features. The created GIS portals can be used in the activities of educational institutions, government bodies, in the activities of scientific institutions.

The paper unfolds the content of the concepts “Bison” and “Dragon” in the Belarusian and Chinese linguo-cultures. Through reference to the study of the national language and literature in close connection with the cultures and mentalities as well as with the national identity of both countries the concepts are reconstructed through the prism of such modern linguistic disciplines as linguoculturology and linguoconceptology. The study of the means of verbal and non-verbal expressions of the concepts “Bison” and “Dragon” enables the authors to distinguish the most significant features of the concepts and point out their cultural value from the viewpoints of two contradictory trends of modernity: the processes of globalization and the desire to preserve national identity. Considering the concepts of “Bison” and “Dragon” in the Belarusian and Chinese linguo-cultures, literature, arts, heraldry, the results of the associative experiments are presented. The analysis of poetic and prose works proved the cultural value of the concepts under consideration.

We distinguish 2-maximal and strictly 2-maximal subgroups of a finite group and give examples of soluble and simple groups in which every 2-maximal subgroup is strictly 2-maximal. Let M be a maximal subgroup of a group G. We prove that every maximal subgroup of M is strictly 2-maximal in G if M is normal in G or if G is p-soluble and We describe the structure of a finite group in which all 2-maximal subgroups are Hall subgroups. In particular, it has a Sylow tower and all its Sylow subgroups are elementary abelian.

Introduction. Water resistance is one of durability criteria of building materials. As a rule, the value of the liquefaction ratio is applied to assess the water resistance. However, even water resistant materials are not always able to withstand cyclical weather impacts that cause linear deformations, reduced strength and cause destruction of building products. Therefore, it is necessary to take into account the resistance of building materials, namely, their resistance to alternating humidification and drying (airproof performance). The purpose of this research is to study the producibility of molded composites containing a modified magnesium binder that features higher resistance to weather impacts. Materials and methods. The magnesium binder was modified by the silica fume and high pressure molding to increase the water resistance and airproof performance of the composites. The influence produced by the modifier on the change in the compressive strength of dried and water-saturated molded composites, liquefaction and airproof performance ratios, as well as linear deformations of the reference specimens were studied following a pre-set number of cycles of alternating wetting and drying. Results. The water resistance and airproof performance of construction products, containing magnesia binders, may be improved by the micro-silica, added to pressed mixtures, and their compaction by press molding. Compositions of molded composites, containing a modified magnesia binder, were developed for the manufacture of products used to make enclosing structures and for the flooring of rooms having the indoor humidity of over 60 %. Conclusions. It is established that molded composites containing a modified magnesia binder feature high resistance to alternating wetting and drying. The proposed method of modifying magnesia binders prevents the destruction of molded stone-like materials containing these binders in case of exposure to alternating stresses; it reduces linear deformations and, as a result, decelerates the fatigue failure. The use of a recyclable material as a mineral additive must contribute to the reduction of the cost of products and allow to consider the method of their production as one of the best technologies available.

This paper describes two prototypes of an on-site Early Warning Water Quality Monitoring System (EWWQMS) for pesticide quantification in natural waters. As many pesticides are non-fluorescent, the EWWQMS setup uses UV photoconversion to form highly fluorescent photoproducts. To enhance sensitivity, the two prototypes use micellar-enhanced fluorescence with surfactant (cetyl trimethyl ammonium chloride) in aqueous solution. To improve specificity, four UV LEDs at different wavelengths then excite the fluorescent photoproducts. The EWWQMS prototypes also employ UV absorption for quantification of non-photosensitive pesticides. The first prototype detects the pesticides via a diode array spectrometer. The second system is developed with higher resolution spectrometer and an intensified CCD camera detection to improve the sensitivity of the method. These experimental set-ups are described, explained and tested. Analytical applications were carried out online in CTAC aqueous solution, for the determination of isoproturon, flufenoxuron and profenofos. The calibration curves obtained are linear over one order of magnitude, and the detection limits are in the ng mL-1 range. The analytical performances of these new methods are good compared with other published classical micellar enhanced photo-induced fluorescence methods for the determination of pesticides in aqueous solutions. Our results show that these EWWQMS prototypes can be used as a warning system to protect against pesticide contamination exceeding the threshold of treatment capabilities at industrial facilities using natural waters.