Search

The study analyzed the thermal performance of enclosing structures made of: polystyrene concrete, heat block, arbolite blocks, foam concrete and aerated concrete. The calculation of heat losses was carried out using finite element methods, in the software package “Elcut”. The results of the study showed that the enclosing structure in the form of a wall consisting of aerated concrete blocks will be most effective in terms of heat conservation. In order to identify the most affordable and economical material for the construction of a house with an estimated area of 100 m2, an enlarged calculation was carried out, including determining the cost of building material necessary for the construction of an enclosing structure. According to the calculation results, the most expensive technologies turned out to be construction options from aerated concrete blocks and a heat block. The house made of wood-mineral composites (arbolite) turned out to be the most inexpensive. The materials of the work can be used by developers in the selection and justification of materials for wall structures of low-rise construction.

The article discusses the advantages of simulation modeling of the number of sales personnel in order to increase the economic efficiency of the organization. Headcount optimization aims to generate savings while meeting the organization’s goals. This example considers the activities of one of the leading players in the regional food market. In accordance with the general structure of the processes of receiving and servicing customers in the organization, their simulation model was developed in the GPSS World software environment. The obtained conclusions are economically substantiated.

The article discusses the advantages of simulation modeling of the number of sales personnel in order to increase the economic efficiency of the organization. Headcount optimization aims to generate savings while meeting the organization’s goals. This example considers the activities of one of the leading players in the regional food market. In accordance with the general structure of the processes of receiving and servicing customers in the organization, their simulation model was developed in the GPSS World software environment. The obtained conclusions are economically substantiated.

The article The low competitiveness of many agricultural organizations is mainly due to the insufficient use of opportunities to improve the efficiency of their management. The effectiveness of the activities of agricultural organizations determines the provision of the population with food products. This indicates the paramount role of strategic management of the development of agricultural organizations, and, above all, strategic planning.

The paper presents an approach to the automatic grouping algorithms development based on parametric optimization models for processing high-volume data in the agrarian and industrial complex. Combined search algorithms with alternating randomized neighborhoods show much more stable results (give a smaller minimum value, and also have a low standard deviation of the target function) and hence better performance compared to known (so-called classical) algorithms, such as j-means and k-means.

At present, the problem of depletion of forest resources and the associated increase in the export shoulder and the corresponding logistics costs are increasingly felt. Today, as one of the solutions to this issue, the concept of using timber terminals has been applied, when the processing of roundwood into a more appropriate form, including for transportation, is carried out in close proximity to the cutting area. The overall efficiency of timber terminals is affected by the equipment operated on them, in particular, the sawmill. This article discusses the main types of sawmills according to the type of working body: tire, frame, tape and disk, indicating their positive and negative qualities for direct use in timber terminals. The article also formulates tasks aimed at improving the energy sustainability of timber terminals - as production sites for deep processing of timber.

One of the leading places in the complex of measures to increase the productivity of forests and the rational use of wood resources is occupied by thinning for forest care. Timely and justified thinning for forest maintenance allows not only increasing the productivity and sustainability of forests, increasing the size of forest use, but also creating prerequisites for the effective implementation of environmental protection and climate control functions by forests. Growing highly productive stands of optimal composition requires regular forest maintenance. In the Republic of Belarus, forest thinning is carried out by various multi-operational systems of machines and methods, each of which has its own characteristics and efficiency depending on the conditions of their operation. This article analyzes the effectiveness of thinning for forest care in the conditions of forestry institutions of the Republic of Belarus using multi-operational systems of machines. The most important goals for the development of the country's forestry are noted, among which are the provision of the formation of highly productive and sustainable forests, as well as increasing the resource potential of forests to meet the needs of the environment and society.

To create control systems, mathematical models of objects are required, which often have to be obtained experimentally. In this case, the numerical data of experiments on the identification of essentially nonlinear objects can be satisfactorily approximated only in certain areas, which leads to fragmentary models that are not analytical. In these cases, when only fragmentary models are adequate, it is proposed to apply the new Cut-Glue approximation method, which allows obtaining a model with analytical properties. The proposed approach to the unification of the Cut-Glue approximation method is demonstrated by solving the problem of synthesizing a nonlinear airship altitude control system and studying it.

In this paper authors develop and research system for motor boat control, that allows to move along the stated paths with the given speed. It is assumed, that boat is equipped by the measuring system that provides current coordinates, linear and angular velocities. Control system is based upon the mathematical model, presented earlier (see references). In order to analytically find the necessary controls, all equations were transformed to Jordan controllable form. Besides solution this transformation also allows to handle model nonlinearities and get required quality of movement along the stated paths. Control system includes algorithms for control of longtitudal velocity and boat course. Research of the proposed control system according to boat design limitations for the values of control variables was performed by simulation in MATLAB. Results of two experiments, different in value of the required velocity are discussed.