One of the main sources of electromagnetic radiation in the environment are power lines, not taking into account this fact, there are increasingly cases of construction of buildings in close proximity to the boundaries of the security zones of air lines. The purpose of this study is to improve the electromagnetic safety of the population, as a result of the use in the construction of residential facilities located near overhead power lines, structural and finishing materials with the greatest shielding ability. On the example of "corrugated Board" of different brands, used as a shielding material, the indicators reflecting the efficiency of electromagnetic shielding are obtained. Also, according to the results of the study, it was found that not only the raw material from which the material is made plays a role in the shielding of the electric field, but also its form factor.

Keywords: electromagnetic radiation, electric field, security zone, shielding ability, voltage class, power line, material

We consider the problem of diagnosing breast cancer on the basis of combined thermometry. Diagnosis is carried out using two-dimensional generalized signs. Each such sign is formed on the basis of two one-dimensional. We propose an algorithm for the formation of sets of such features using tapering ellipses. On the basis of a set of such signs a classifier is built. By varying the semi-axes of the ellipses, the physician can control the sensitivity and specificity of the classifier. The doctor can fix the threshold value of specificity and achieve the maximum value of sensitivity. As a result of computational experiments, we built a family of 300 sets of two-dimensional signs and implemented a classifier customized by the doctor.

Keywords: combined thermometry, diagnostic algorithms, data analysis, algorithm sensitivity, algorithm specificity, logistic regression, custom classifier, breast screening, mammology

The use of polymer concrete sleepers based on rubber concrete (RubCon®) with non-metallic composite reinforcement and the method of manufacturing such sleepers are described.

Keywords: sleepers, polymer concrete, rubber concrete, composites, reinforcement, manufacturing methods

On the basis of the model of non-piston displacement of oil with water, a mathematical model, algorithm and software product are presented, which allows to conduct numerical studies of the indicators of the development of a layered layer, taking into account the method of flooding the field: reservoir water temperature or hot water.

Keywords: continuity equation, heat transfer equation, non-piston displacement of oil by water, finite-difference scheme

The authors conducted field studies of a sequential series of breakdown voltages of the ignition system of the engine ignition model F8CV of the Daewoo Matiz car idling at a minimum crankshaft speed (650 rpm). The experiments were conducted on the basis of a microprocessor system for studying the distribution of breakdown voltage values. In addition to the distribution over the ranges of breakdown voltages, the algorithm of this system allows you to record a series of breakdown voltages in the microprocessor RAM. It was revealed that a sequential series of voltage values ​​can: increase several cycles (no more than 3 cycles); several cycles to decrease (no more than 3 cycles); stay the same. It can be assumed that there is a correlation between the breakdown voltage and the maximum cycle pressure. A further research objective is to identify the patterns of change in breakdown voltage in a sequential series of breakdown voltage values.

Keywords: ignition system, spark discharge, internal combustion engine, spark plugs, breakdown voltage, histogram

Finite state machines, being a mathematical abstraction, allow you to perceive information from the control object, process it and give signals to control the object. The disadvantages of the representation of complex production systems by a set of finite state machines include the complexity of carrying out logical and set-theoretic operations on them and the complexity of describing the parallelism that occurs in the operation of complex production systems. When specifying a finite state machine in the matrix–predicate form, due to the information redundancy, it is possible to avoid these difficulties. Matrix–predicate method allows you to uniquely set the finite state machine square matrix, which makes it possible to use the methods of the theory of matrices during the set–theoretic operations on them and it is possible to avoid isomorphism. The paper presents the developed methods of representation of a finite state machine using a multi-place predicate, which greatly simplifies its task.

Keywords: finite state machine, graph, matrix, predicate, algorithm, matrix–predicate method, graph incident, tuple, Cartesian product, complex production systems

The paper deals with the derivation of the basic relations of the theory of finite rotations. A numerical study of the dependence of the guide cosine of the final rotation on the guide cosines of a fixed coordinate system and the coordinate system associated with a solid is carried out. The formulas for the cosines of the angle of final rotation are obtained. The developed program of calculation of the values of the guides of the cosines of the final turning of the quantities in the problem statement. A graph of the dependence of the guide cosine of the final turn on the sine of the angle of the final turn. This dependence is clearly displayed when the program is started.

Keywords: vector orientation in space, spherical trigonometry, finite rotation angle, guiding cosine, Euler angles, finite rotation

This work is a description of the method of restoration of patterned woven fabric by means of computer technology. The problem of computer reconstruction of a historical object is rarely addressed in scientific publications. However, now the question of the feasibility of prototyping and modeling in the digital space is significant, because it is a computer model that allows you to give an accurate idea of the task, of problem situations, helps to warn about possible or already occurred errors.

Keywords: textiles, computer technology, raster editor, digital restoration, macro, processing, restoration, pattern, pattern, fabric

The technology of oil production includes a large number of processes in its cycle; extraction is one of the most energy-intensive processes before distillation of miscella. Analysis of automated extraction control methods determines the optimal process control method, which allows to improve the quality of miscella and save product consumption.

Keywords: automated, miscella, extraction, control, system, analysis, method, flow, solvent, quality

The object of research is the consideration and analysis of such a field as information retrieval. Given the rapid growth in the number of electronic documents, the tasks of their clustering, classification and ordering become very relevant. The work also indicates the need for creating formal methods for the semantics of texts and their processing. In addition, a software product was created that implements such a functional of semantic analysis as context and contextual bundle. The scientific novelty is to teach the machine to disclose the physical meaning in the documentation of a technical nature, to optimize the search for the necessary data

Keywords: semantics, contextual connective, reverse polish notation, clustering, context

Features of functioning of the enterprises of car service at increase in seasonal demand for THAT and repair of motor vehicles are considered. For the analysis of their activity in the conditions of limited resources and a random flow of applications (requirements) the device of system of Queuing is applied

Keywords: Enterprise car service, the flow of requirements probability, criteria, costs, efficiency

The algorithm of calculation of the main geometrical characteristics of the section consisting of pair angles at a bend of both angles is made. The received results are applied to definition of a carrying capacity of an element of a farm.

Keywords: a rafter farm, bend, a barycentre, a moment of inertia, a radius of inertia

The article presents the results of the development of wooden building blocks that allow to saturate the room air with phytoncides of Siberian and other species of wood and plants. Shows the fundamental design of the blocks, the features of its production and processing. An example of the positive effect of essential oils on the reduction of bacterial air pollution is given. Buildings and structures of the proposed unit are quickly built without the use of specialized equipment. The construction and reconstruction of such a structure can be more effective in terms of both labor costs and terms of work, in comparison with traditional construction practices. Production of buildings from the offered blocks opens prospects of low-cost construction of low-rise constructions, both residential, and industrial use.

Keywords: wood building material, environmental friendly, wood processing, resin, essential oil, extract

Mathematic modeling of the state of a thin round disk being heat and force affected is performed. In the central part of the disk the homogeneous field of temperatures is formed. Within the deformation theory of a perfect elasto-plastic solid the quadratic plasticity condition is chosen. The relationships between the radius of the disk, the temperature of the central part of the disk and the external pressure which defines the appearance of plastic zones have been established. For different values of external parameters of the model the stress vector hodograph and the plots of stresses and equivalent stresses have been introduced.

Keywords: mathematic modeling, an elastic-plastic solid, the plane-stress state, the deformation theory, thermo-elasto-plasticity, a high-speed rotating disk

The process of cavitation is one of the reasons for the premature wear of pumping equipment components. Elements of a pumping wheel are subject to the greatest wear. In addition, cavitation causes undesirable effects such as vibration and noise. In order to reduce cavitational damage and increase the service life of pumping equipment, the authors of this article propose to install a special-shaped flow divider at the pump inlet that breaks the flow entering the pump into separate jets of a certain shape and structure.

Keywords: fluid, centrifugal pump, regulation, cavitation, flow, bubble, flow divider