Krasnoyarsk State Agrarian University

The paper considers a pilot scale technological section designed for the pretreatment of a combined oxidation product of a gold bearing flotation concentrate prior to sorption cyanidation. The section comprises, in sequence, filtration units with chamber membrane filter presses, a rotary drum dryer, an oxidative roasting unit based on a tubular kiln, a regrinding stage in a ball mill with hydrocyclone classification, and a thickening stage with flocculant addition. Based on pilot roasting tests of the combined oxidation product, the influence of temperature and residence time on gold recovery is analysed, and an optimal roasting regime is justified. The role of residence time control in the tubular kiln, as well as operating parameters of filter presses, hydrocyclones and the thickener, in shaping the required properties of calcine and slurry is discussed. A three stage strategy is proposed to increase the roasting section capacity up to 25 t/h through process fine tuning, improvement of the burner system and possible installation of an additional kiln.

Relevance. Superficial wounds are one of the most common injuries in domestic and farm animals. Their healing is complicated by factors such as conditions of detention, lifestyle and untimely access to veterinary specialists. In this regard, the search for effective treatment methods that accelerate tissue regeneration remains an urgent task in veterinary medicine. The aim of the work is to evaluate the effectiveness of the combined use of the “Collachit-FA” wound healing coating and phonophoresis in comparison with using only the “Collachit-FA” wound coating. Methods . The work was performed on the basis of the animal hospital, the Vita clinic and the histological laboratory of the Krasnoyarsk State Agrarian University. For the experiment, female hybrid rabbits were selected according to the principle of analogues, kept in the same conditions. The material for the study was modeled wounds, tissue samples for histological studies. The research methodology included morphometric, macroscopic and histological methods. Results . It was found that in the experimental group (phonophoresis + “Collachit-FA”), the wound surface area decreased faster: by the 28th day, it was 3.86±0.23 cm2 (6.8% less than in the control group; p < 0.05). Histological analysis confirmed the acceleration of reparative processes: by day 21, complete restoration of the epithelium was observed in the experimental group, while in the control group the basement membrane remained uneven and the epithelium was immature. By day 28, complete healing of the skin was noted in the experimental groups. Thus, the combination of “Collachit-FA” wound healing coating with ultrasound stimulation significantly accelerates tissue regeneration in animals.

The relevance of the work is explained by the significant problems of the modern aerospace industry, mechanical engineering, energy, mining, processing and other industries in the disposal of waste products made of composite materials and products based on composites of various functional purposes (carbon fiber, fiberglass, metal-ceramic and cast glass reinforced). The aim of the work is to increase the efficiency of processes for obtaining micron fractions of composite materials waste through the use of an upgraded roller crusher-shredder design. Computational and experimental studies have substantiated the possibility of increasing the efficiency of waste recycling of composite materials due to their gradual (step-by-step) disintegration. Based on analytical calculations and finite element analysis methods, a kinematic scheme, layout and design of an upgraded prefabricated roller crusher-shredder with working bodies (discs) in the form of an equiaxed contour – a Relo triangle – have been developed. The new design implements a more complex system of forces (compression, friction, alternating cyclic loads) compared to analogues, which makes it possible to increase the speed and productivity of the crushing process. The process of cutting the material using the “rotating scissors” mechanism is implemented between adjacent counter knives of the PK profile, which also contributes to more intensive grinding of the material (especially when processing lamellar or long fragments of waste). The original location and inconsistency of the contact points of the oncoming profiles, the gap between the discs during their rotation creates a rolling effect due to the reciprocating movement of the crushed material, which reduces the risk of jamming and increases the throughput of the grinding rolls and the intensity of the disintegration processes. In order to determine the best performance in terms of the size of the working bodies of the crusher, the gap between them when grinding materials with different sizes and properties, kinematic models were created to simulate the grinding processes and conduct a numerical experiment using finite element analysis methods. It is shown that due to the effective combination of various fracture mechanisms (abrasion, crushing, cutting, alternating loads), the intensity of deformation processes and specific loads on the material increases, but the stresses on the working surfaces of the crusher vary in the range of 430–580 MPa, the safety margin of the working bodies increases to 0.43–0.65, which is a prerequisite for increasing the service life of the workers. grinding elements. The results of calculations using new methods and kinematic schemes show that the design of the upgraded prefabricated roller crusher with working bodies in the form of a Relo triangle has an increased resultant speed (by 30 %) and productivity is almost 2 times higher than the prototype with cylindrical rolls (with the same or comparable sizes of working bodies, kinematic parameters in terms of rotation speed and drive power). Design and technological preparation was carried out and a prototype of the installation for experimental studies was made, which confirmed a good agreement between the calculated and experimental data on the size of the gap, the speed and productivity of the crushing and crushing process.

The effective use of land resources in built-up areas provides for the integrated and sustainable development of the territory. The sustainable development of the territory is ensured by urban planning activities, which include urban zoning, land use and development rules, and urban planning regulations. In modern conditions of development of society, the problem of rational use and protection of land resources is becoming more and more urgent. This is due to population growth, the development of industry and infrastructure, as well as changing climatic conditions. In this regard, there is a need to develop and implement effective methods and approaches to land management. Oktyabrsky district is one of the largest and most populated districts of the city, and its development plays a significant role in the overall development strategy of Krasnoyarsk. The study will identify the main problems and potential of the area, as well as offer specific solutions.

The aim of the study is to investigate the effect of peat-sand substrates with the addition of sapropel on rhizogenesis, growth and development of rooted cuttings, and the quality of steppe cherry seedlings. The experimental work was carried out at the Garden Center of the Agrarian University LLC in the Krasnoyarsk forest-steppe in 2017–2020. The object of the study was green cuttings of the Subbotinskaya variety of steppe cherry. The culture was reproduced by green cuttings according to the generally accepted method of M.T. Tarasenko. Stem cuttings were harvested in the first ten days of July, soaked in a solution of indole-3-acetic acid (IAA) for 12 hours and planted in a greenhouse according to the 7 × 7 cm scheme in accordance with the experimental options. The basic substrate for rooting the cuttings consisted of high-moor acidic (Ph2o – 3.1) peat and river sand in a volume ratio of 1 : 1. To reduce the acidity of the peat and saturate the substrate with macro- and microelements, sapropel (Ph2o – 7.4) was added to the peat-sand mixture in doses of 10, 15 and 20 t/ha. In some variants, ammonium nitrate was additionally added at a dose of N30. The rooting of green cuttings of steppe cherry on the control version of the substrate was 64.5 %. Rhizogenesis of cuttings material in the block of variants peat + sand + sapropel is 16.6–18.1 % higher in relation to the control; in the block of variants peat + sand + sapropel + N30 it exceeded the values of the control cuttings by 22.6–27.7 %. The share of influence of the "substrate" factor on rhizogenesis of cuttings is 49.5 %. The inclusion of sapropel in the substrate contributed to a statistically significant increase in the number of roots and the total length of the 1st order of branching roots on rooted cuttings. The largest number of seedlings of the 1st commercial grade was obtained in the variants peat + sand + sapropel 20 t/ha and peat + sand + sapropel 20 t/ha + N30 – 70.6 and 71.4 %, respectively.

This article reviews current advances and key challenges in integrating optical sensors into Smart Dust technology for environmental monitoring. The principles and advantages of optical sensors are analyzed, alongside their vulnerability to external influences and high-power consumption. Special attention is paid to issues of miniaturization, autonomy, and the organization of energy-efficient communications between sensor nodes in harsh environments. The paper describes operational scenarios for Smart Dust systems, including passive and active optical communication, as well as approaches to reducing energy consumption and increasing resilience to environmental factors. Prospects for technology development are discussed, including improvements in MEMS components, new data processing methods, and the implementation of multisensor networks to enhance the effectiveness of environmental monitoring.

Currently, the Russian market is largely characterized by a high level of competition from domestic and foreign manufacturers. In order to maintain their positions in the market, enterprises need to improve the logistics system. The logistics system of an enterprise includes all interconnected links - supply, production and distribution, as well as transportation and storage. The relationship and work of all links is a complex logistics process that occurs in our time in the conditions of an unstable geopolitical situation, high competition in the market. With the development of globalization of economic processes, an increasing number of market participants communicate in supply chain systems. Most of the participants are divided into two types: in the first one, the participants are distinguished by the predictability of their reactions to market changes, in the second one - there are participants whose reaction to market impacts is difficult to predict. Hence, the reasons for the emergence of risky situations in the processes of goods movement in supply chains are clear. Research by various authors tend to search for the causes of risks directly at the enterprise participating in the supply chain. This study attempts to structure risks depending on various factors and conditions of market impacts on supply chains. At the same time, attention is drawn to the dual nature of risks, separately highlighting their negative impact on supply chains and speculative (dual) impact.

The purpose of the study is to identify key methodological principles for adapting of performance indexes of classical libraries to assess the pedagogical and educational effectiveness of electronic library systems in professional education, as well as to determine their practical significance for the formation of tools for analyzing the impact of digital resources on the learning process.Materials and methods. The study used an integrated approach combining theoretical analysis and empirical methods. A systemfunctional approach was applied to formulate the advantages of electronic library systems (remote, fast, equal, easy ... access), which provided a comprehensive analysis of their impact on the educational process. The historical and analytical method was used to identify key performance indexes used in evaluating the activities of classical libraries, which made it possible to justify their adaptation to the conditions of the digital educational environment. The empirical analysis included the processing of statistical data provided by electronic library systems using information from administrative offices and open sources. The regulatory and legal analysis covered the study of state standards and the provisions of Federal Law No. 273-Federal Law “On Education in the Russian Federation”, which ensured the verification of the compliance of the electronic library systems’ functionality with established educational requirements. The comparative method was applied to compare traditional library performance indexes with new metrics determined by the specifics of the digital environment.The results of the study demonstrate that despite the continuity of the main performance indexes from classical libraries, they are transformed and acquire a new quality in the digital environment. Metrics such as the number of registrations, the number of visits and requests, the number of bookings, bounce statistics, and search queries are becoming more detailed thanks to digital technologies. The adapted indexes allow for a more detailed approach to assessing the pedagogical and educational effectiveness of electronic library systems – the impact on the formation of professional competencies, support for learning continuity, and achievement of the federal state educational standard of higher education.The conclusion emphasizes that the results obtained create a theoretical and methodological basis for the development of a comprehensive model for evaluating the effectiveness of electronic library systems, requiring further verification and in-depth study of the relationship between the use of electronic resources, students’ academic performance and the formation of professional competencies.

Despite the 80 years that have passed since the defeat of the Nazi occupiers, the history of the restoration of agriculture in the Krasnoyarsk Region, as an integral part of the country's economic complex, has not been sufficiently studied. The purpose of the study is to identify the tasks assigned by government agencies to the region's agriculture in the context of the post-war restoration of the country's national economic complex and overcoming the consequences of the drought of 1946-1947, and the role of the regional executive committee in their implementation. The study used materials from the collection of the Krasnoyarsk Regional Planning Commission, which had information on the real state of affairs in the economic complex of the region, introduced into scientific circulation for the first time. The paper shows the tasks set by the country's government and the ministries of agricultural profile for collective and state farms of the region, the role of the regional executive committee and its planning commission in creating conditions for overcoming existing and emerging problems, measures to improve production efficiency, and the achieved results of work.

The unique characteristics of the human facial eye area are determined by the specific relationships between the bone orbit morphology and surrounding soft tissues, creating the distinctiveness of each individual face. Understanding of the relationship between the eyelids structure and the position of the eyeball ensures accurate reconstruction of a face based on the cranial characteristics. The paper presents a protocol for studying craniofacial relationships on anatomical material. It includes dissection, photo-recording and measurements on anatomical specimens and their images. The position of the pupil center in relation to the bone orbit was determined on full-face and profile specimens. The attachment sites of the canthal ligaments and their position in relation to the inner and outer corners of the eye were recorded. Detailed measurements of the bone and soft tissue structures of the eye region were taken. The author also proposes a method for determining the area of the opening of the palpebral fissure relative to the area of the orbital base. The ratio of the palpebral fissure area to the area of the orbital base was about 50%. In our case the pupil center was positioned superiorly towards the upper edge of the orbit. The results were compared with similar studies on different material.