Agents of the transport and logistics market (TLM) in the implementation of their activities implement solutions aimed at maintaining and developing their position in the market through active interaction with counterparties (cooperation, diversification of capital and activities) in changing environmental conditions. The limited volume of transport services and changes in its structure require formalization and systematization of possible actions of agents. The paper provides an analysis of the factors influencing the activity of TLM agents, their formalization and schematic solutions for the implementation of their activities.
Keywords: transport and logistics market, activity, market agent, stability, formal model, efficiency indicator, profitability of services, logistics chain, volume of transport work, railway transport
The article analyzes the impact of the transition to distance learning on the academic performance of students of the Institute of Computer Science, Electronics and Robotics. The disciplines are identified, the development of which does not cause difficulties in the remote format and disciplines to which such technologies are difficult to apply. Based on the findings, recommendations are given to improve the quality of education at the Institute.
Keywords: quality, distance technologies, academic performance, control card, alternative attribute
An overview of the rationale for the use of lightweight multi-hollow floor slabs is given. Technological and design features of multi-hollow floor slabs are considered. The possibilities of rational use and labor intensity of lightweight hollow floor slabs are presented. On the basis of existing technologies, calculation methods for lightweight hollow slabs and current norms, the calculation of monolithic slabs in the Lira software package was carried out. The work of floor slabs with spans equal in two directions is considered. It was found that regardless of the span of the floor slab, the effect of reducing its own weight exceeds the effect of reducing the cruelty of the section. The total deflection from the floor slab's own weight and payload on it for hollow slabs is lower than for solid slabs of the same span.The conducted numerical experiment allows us to establish the limits of the effectiveness of the use of lightweight multi-hollow monolithic floor slabs, upon reaching which the use turns out to be significantly more profitable than the use of traditional girderless floors.
Keywords: constructive scheme, software package, overlap, building, multi-cavity plate, calculation, labor intensity, design
The paper proposes a method for preparing a dataset for training and testing neural networks in the MATLAB environment using the Image Processing Toolbox package of functions. An example of the implementation of this technique for preparing a dataset for training convolutional neural networks to classify wheat seeds into high-quality and low-quality classes according to its images is given. This technique was used to obtain a dataset of 900 images, which were successfully used to train and test the convolutional neural network.
Keywords: dataset, convolutional neural networks, artificial intelligence, image classification
The article discusses the use of mathematical modeling of the transmission of a car in the Simulink environment. Studies of the influence of individual transmission factors on the functional parameters of the KAMAZ 4308 car have been carried out. Differential equations describing the operation of the transmission are solved in a matrix way, allowing to study the dynamics of the car taking into account the moments of inertia of the engine, transmission and individual wheels of the car.
Keywords: transmission, wheeled vehicle, clutch, differential, gear ratio, simulation, maximum speed
The mathematical model of coordination of private and public interests in the implementation of innovations in the case of multiple agents is studied. It is taken into account the presence of two management levels, that are several agents and the supervisor.The relationship between the supervisor and the agents is designed hierarchically in accordance with the information regulations of the Stackelberg games. Two mehods, simulation modeling and the method of qualitatively representative scenarios (QRS), are used to construct Stackelberg equilibria. Numerical experiments have been carried out using these two methods. The analysis of the obtained results is given.
Keywords: Stackelberg game, simulation modeling, method of qualitatively representative scenarios (QRS), supervisor, agents
This paper presents a mathematical model and a geometric method of image-based object classification intended to improve the accuracy of object classification by filtering out noise objects.
Keywords: image processing, object recognition, pattern recognition, object identification, classification
A computer mathematical model was developed to predict the course of working processes in the device. To estimate the reliability of the obtained model, the study of mass-exchange characteristics of the experimental cooling device was carried out. Analyzing the graphs of mass-exchange characteristics of the model and the experimental cooling device it is possible to conclude about their correspondence. The conducted tests allowed to reveal three characteristic zones of distribution of two-phase gas-liquid flows arising in the working zone of the atomizer at the atomizer's output in the steady-state operation mode. It is proved that the optimum air pressure at the inlet of the vortex chamber can be considered as 0.10...0.15 MPa.
Keywords: ejection, cutting zone cooling, mathematical model, dispersant, emulsion, aerosol, lubrication, turbulence, pressure, mass transfer, atomization
At present, various software systems are widely used to carry out researches in the field of technology, make it possible to create mathematical models of real objects. Their further study allows to obtain a large amount of calculated data necessary for units’ design, resource assessment and performance of the object under study. This makes it possible to significantly reduce the conduct of experimental studies of real objects, as well as to obtain additional data that characterize specific parts during operation, such as the values of internal stresses, natural vibration frequencies, data on strength, fatigue, etc. However, during the process of real objects models creating, not always all the necessary data is available. In this regard, it is necessary to carry out research with some real details. To determine the material hardness of the rotor shaft of the turbocharger at different depths from the shaft surface, special new samples were made. Next, the microhardness of the material was determined. The hardness of the material from the surface decreases and at a depth of 1 mm becomes equal to the hardness of the unhardened one. After research finishing, a geometric model of the rotor shaft is created. The model is created using the SolidWorks Simulation complex. The working part of the shaft model consists of two layers: the first one is the surface with increased hardness and 1 mm thick; the second one is internal unhardened. This model is used in the research and development of technological processes for the repair of the part.
Keywords: software package, mathematical model, static analysis, rotor shaft, hardening, hardness, sample, depth, surface layer, repair
The article provides a comparative assessment of the possibilities of visual and machine sorting of sawn timber. It is noted that in conditions of depletion of forest resources, visual sorting of sawn timber according to the criteria of GOST 8486 cannot guarantee strength indicators corresponding to the assigned type of wood. while machine sorting allows for an objective sorting of wood according to the normalized values of strength, modulus of elasticity and density, according to the specified lower limits of their standard values. Using the example of the second grade wood (strength class C24), the influence of the statistical scatter of data on the rejection minimum assigned during machine sorting of sawn timber is considered.
Keywords: timber, sawn timber, visual sorting, machine sorting, rejection minimum, standard resistance, strength classes, coefficient of variation, strength control
Studies of a cylindrical mesh shell using the method of decomposition into flat faces and the LIRA application software package have been carried out. The assessment of the possibility of using the considered approaches in the analysis of specific sites and in the case of a complete study of the mesh surface is carried out. The necessary indicators of inclusion in the work of the design, reliability, accuracy and speed of calculation of design parameters are determined. The characteristics of the stress-strain state of the system are revealed, which made it possible to recommend an approximate calculation method for quickly determining preliminary results. Methods of obtaining calculated data in all zones of the shell on a cylindrical surface are analyzed. With the help of application software, a high degree of information about the forces, displacements and mass of the spatial structure was obtained. The simplicity and clarity of visualization of the obtained schemes in accordance with the design requirements are noted.
Keywords: cylindrical mesh shell, approximate method, computer approach, calculated parameters, forces, displacements, mass
The article indicates the need to use a factorial approach in the study of architectural heritage as applied to the architectural solution to the problem of modern retail environment in the Rostov region. On the example of E.M. Nikitin's trading house in Rostov-on-Don and club of the Credit Association in the Starocherkasskaya village the objective (human environment) and subjective (human mentality) factors which conditioned their constructive, planning and architectural and artistic peculiarities are outlined. From the position of rethinking of conceptual basis of formation in the Rostov region the significance of architectural and artistic image of these objects in giving "Rostov color" to the urban environment is determined. By the example of E.M. Nikitin's house and having studied the analogues of the clubs of the beginning of the XX century the Club of the Credit Association is restored. Conducting urban analysis revealed the need to reconstruct the building of the Credit Association for the public function "Exhibition Gallery".
Keywords: Architecture, construction, art nouveau, trading house, Nikitin's trading house in Rostov-on-Don, Credit partnership, club, Starocherkasskaya st.
The article discusses the main indicators of acceptance of work on engineering and geological surveys for compliance with the technical task of the Customer, the main technical indicators and on the results of control and acceptance of work satisfy the requirements of the joint venture. The main indicators of the deformation characteristics of the soil obtained by static and field tests are shown. To control the homogeneity and humidity of the soil after testing, samples were selected. According to the results of the test, graphs of the precipitation of the stamp of the pressure stamp are constructed. According to the test results, modules are deformed soil deformation in a water-saturated state. Geological and engineering and geological processes are identified at the site of the designed construction and are presented with increased seismicity and flooding.
Keywords: Acceptance of work, engineering and geological surveys, customer's technical task, main technical indicators, control and acceptance of work
This article explores the application of Fitwel's green certification standard to office buildings where employees spend most of their lives. The importance of the conditions of the office building in which its employees are located in terms of the impact on health and productivity was emphasized. The essence and advantages of using the Fitwel standard are demonstrated.
Keywords: office building, certification, green standard, Fitwel, health, productivity
The article considers the influence of external noise sources on humans and the environment as an environmental factor and ways to combat noise. The aim of the work is to study the external enclosing structures of residential buildings, the facades of which are oriented to a noisy highway on the example of residential complexes of the city of Rostov-on-Don and noise screens installed on the highway along the residential development of the city of Bataysk, Rostov region. A practical method of measuring the noise level using a noise meter is used. Acoustic measurements of the noise level were carried out, which made it possible to conclude about the effectiveness of the noise protection structures provided. It has been experimentally established that noise-proof structures reduce the sound pressure level to an acceptable level. When designing residential buildings, a simultaneous calculation of noise protection and thermal protection of buildings is necessary, determining the materials, the design of the outer wall, the thickness of the insulation layer and the choice of noise-proof windows. To improve the noise ecology near residential buildings and federal highways, it is recommended to use modern technologies for the construction of noise screens. According to the research results, it can be concluded about the effectiveness of the use of noise screens during their continuous construction along the highway.
Keywords: noise, noise protection, noise shield, noise-proof structures, sound power level, sound insulation, ecology
The article is devoted to a comprehensive urban planning analysis of the building along Lenin Avenue in Rostov-on-Don in the 1960s-1980s. The construction of the district was the initial stage of the introduction urban trends of modernism into the architectural practice of the city. Based on the study of historical materials and the real situation, schemes have been drawn up: dating, height and materials of buildings, the cultural and consumer services and the functioning of the district. The basic principles of planning residential areas typical for Rostov-on-Don in the 1960s are outlined.
Keywords: architecture of the 1960s-1980s, Soviet modernism, urban planning, residential areas, Lenina Avenue, Rostov-on-Don
The article offers an environmentally friendly method to assemble pipes into section in order to build, to reconstruct or to fully repair pipelines both in urban communities and outside them eliminating load-carrying devices. The technique is realized with a specially designed assembly line (DAL) consisting of similar devices positioned along one line. The proposed assembly line is executed as multi-functional since the complete range of production processes can be performed with it, starting from unloading pipe sections to laying a ready section into a trench or onto an elevated pipe pier. The offered engineering solution can be used in all places. 3-D spatial models are presented in the article for illustrative purposes.
Keywords: environmentally friendly method, assembly works, pipeline, pipeline assembly, lifting equipment, engineering process
The problem of maintaining the exact ratio between the components in mixtures based on oxychloride cement is described. This problem is solved by the use of additives plasticizing or water-reducing action. The results of studying the effect of the type of additives on the mobility of mixtures and the strength of hardened oxychloride cement pastes are presented. The positive effect of the use of additives based on naphthalene and melamine sulfoformaldehyde was shown. The negative effect of additives based on lignosulfonates on the strength of oxychloride cement pastes has been established. Assumptions about the reasons for the low efficiency of additives based on polycarboxylate esters are indicated. The positive influence of the plasticizing effect of additives on the homogeneity of the microstructure of oxychloride cement pastes is shown. An assumption about the reasons for the increase in strength when using additives based on naphthalene and melamine sulfoformaldehyde is made.
Keywords: oxychloride cement, Sorel cement, plasticizer, water reduction, additive, modification, structure, strength
This article presents the results of a study of the tendency of composites based on magnesium oxychloride cements to deformation changes. The dependence of the degree of deformation of light magnesian concretes on the conditions of their hardening has been determined. The main factors influencing the deformation of light magnesia concretes have been established. The influence of hardening conditions on the intensity of deformation changes is shown. Revealed the reasons causing uneven deformation of light magnesia concrete. A method for the manufacture of light magnesia concretes has been determined, which prevents their uneven deformation and subsequent violation of the geometry of the structure. It has been established that the introduction of modifier additives, such as cellulose ethers, helps to reduce the delamination of concrete magnesia mixtures, improve their homogeneity and reduce the unevenness of deformation changes over the sample volume.
Keywords: magnesium oxychloride cement, volumetric deformations, shrinkage, expansion, warpage, hardening conditions
The article considers the problem of the formation of urban heat islands. The reasons for the occurrence of such heat islands are revealed. The influence of artificial urbanized surfaces on the albedo value is analyzed. The connection of the appearance of urban heat islands with the reduction of plant and water resources of the city has been established. The estimation of anthropogenic heat emissions, urban morphology is given. Possible solutions for reducing the influence of urban heat island on the microclimate of urbanized space are presented. A number of natural urban planning and architectural construction tools and methods of regulating urban heat islands are formulated. Their complex accounting at the stage of city planning and design of buildings and structures is indicated. This approach is recommended using software systems modeling an urbanized environment as a basis for regulating heat islands, reducing their negative impact on urban space.
Keywords: wind, urban ecology, heat island, anthropo-loading, urbanization, city, relief, albedo, pollution, environment
The architecture of modern sports facilities for surfing and the main modern technologies of the wave formation system for surf pools are considered. An overview of indoor and outdoor surfing pools is presented. The architectural ideas of the latest buildings and projects are analyzed.
Keywords: sports buildings and structures; architectural solutions; surfing; surf parks; surfing pools; wave pools; architecture.
The article discusses the improvement of overhead power line supports (OHPL) by optimizing them and automating the design, including the creation of a OHPL design model as a single system and an algorithm for solving it. Performed the stress-strain state analysis and the optimization of structural forms of support poles, taking into account the requirements of efficiency and manufacturability. Created a system of automated one-stage design of overhead transmission line supports.
Keywords: overhead power line, optimal design, lattice support, design model
The presented study analyzes the issues related to the organization of construction production during the demolition of buildings for housing and civil purposes in the conditions of renovation of urban areas. The main issues in this case are the analysis of the initial data of the pre-design stage, the selection of tools, machines, mechanisms. In addition, it is important to analyze the factors influencing the technical and economic indicators and applied technologies.
Keywords: demolition and dismantling of buildings, organizational and technological solutions, technical and economic indicators of work, a group of influencing factors, technical condition of a building, construction waste
The article describes the well-known design of a tape-shell foundation. Based on the analysis of the known design, a number of factors affecting the limitation of the scope of the tape-shell foundation are derived. In order to ensure the controlled inclusion of the reinforced concrete shell of the foundation in the work, the author of the article proposed the use of a damping gasket under the tape support contours. A gasket made of an easily compressible slab material - polystyrene foam - is compressed under the influence of the load from the walls and columns of the basement of the building, the reinforcement of the shell is stretched and involves the soil of the subshell part of the foundation. At the same time, the strength characteristics of the band-shell foundation increase, the sediment decreases. The author of the article conducted numerical studies to determine the required thickness of the gasket. It is proved that the use of a damping gasket is relevant for soils with a deformation modulus of less than 15 MPa, above this value, the use of a gasket is impractical.
Keywords: tape-shell foundation, reinforced concrete shell, tape support contour, ground whole, auxiliary method of inclusion in the shell, damping gasket, thickness of the gasket