The article considers one of the main systems that ensure the safety of workers and passers – by in a dangerous zone-the protective-catching grid. The types of grid systems, basic principles of their operation, and technical characteristics are described. The requirements for the installation and operation of such systems are considered.
Keywords: grids, construction, security, organization, security screens
The article provides a comparative analysis of facade systems used in the construction of buildings in Russia and abroad. The features and requirements put forward to modern facades in the context of aesthetic, operational and energy-saving characteristics are examined in detail. Special attention is paid to ventilated and non-ventilated systems. It also analyzes the state and dynamics of the facade materials market in Russia. The features of the application of technological solutions in the design of facades in different countries of the world, such as: Germany, Poland, North America, are indicated. The results obtained led to the conclusion that in the market of facade insulation systems in Europe, stucco facade systems were more widely used. In Russia, more than 50% of the market belongs to ventilated facades. In America, innovative “smart” facades are widely spread.
Keywords: facade, facade system, ventilated facade, plaster facade, technology, materials, building, enclosing structures, exterior walls, maintenance
The main part of the technical documents in creation, reconstruction and capital repair of buildings and structures consists of technical executive documentation. Its formation, design, processing demand a lot of time and labor expenses. With the purpose of optimization of these processes and decreasing of work expenses it is necessary to appeal to automatic means of control and exploitation of executive documentation. In the article there are considered technical possibilities of the programs, allowing to simplify compilation of technical executive documentation at construction plant.
Keywords: construction, executive technical documentation, automatic method, optimization, construction control, software systems, systematization of documentation
This article discusses the features of technical operation of cultural heritage objects. The relevance of the topic is that cultural heritage objects, like any real estate objects, need constant measures to maintain the working condition, as well as to preserve consumer properties, and this action requires special attention and rational approaches. Guided by the guidelines for the operation of cultural heritage objects of the peoples of the Russian Federation, the owner or other legal owner of the cultural object must comply with the requirements of regulatory documents for the preservation of the object in order to increase its service life. Thanks to a comprehensive approach to improving the method of restoration of objects of historical and architectural significance, it is possible to increase the interest of tourists to cultural objects and ensure their safety.
Keywords: Object of cultural heritage, operation, operating costs, quality, timeliness, impact, safety, defect, repair, rationality, activities, working condition
This article is devoted to an of solving vector optimization problems using modern technologies, namely, the possibilities of parallel programming. The most problems of economic activity are solved by methods of mathematical programming in this modern world. And most of them have a large dimension. The solution of this problems takes a lot of time even when using the powerful computing systems. The purpose of the article is to use all available logical cores of PC processor to solve problems, which will allow access to all the computing power of PC. Much attention is given to a more optimal algoritm for load disribution across thread, which allow to perform several independent actions. The method of solving vector optimization problems is reworked with the use of the algorithm. Thanks to this, it was possible to reduce the time of solving problems by 0.6n times, where n is the number of logical cores.
Keywords: vector optimization, economic activity, parallel programming, .NET, TPL library, main criterion method, sequential assignment method, target programming methods, multithreading
The granulation process of ammophos in a drum granulator-dryer (DGD) is considered. The main factors affecting the granulation process are considered. The inputs and outputs of the mathematical model of the granulation process are determined. A dynamic mathematical model has been developed for the formation of the equivalent diameter of ammophos granules depending on the flow rate and particle size distribution of the external recycle. Graphs of comparison of simulation results with actual data of normal operation are presented. A graph of the dependence of the equivalent diameter of the granules on the flow rate of external recycling is presented. The model is intended to create a system for stabilizing the granulation mode.
Keywords: ammophos, recycle, granulation, particle size distribution, drum granulator-dryer, modelling, mathematical model
This article explores the use of machine learning methods in vibrodiagnostics. To assess the effectiveness of the use of a neural network, a hypothesis was put forward on the possibility of revealing hidden patterns indicating a defect for structures of the same type with different parameters. The selection of these features by visual analysis of the graphs is difficult due to the large amount of data, which indicates the relevance of solving the classification problem using a neural network. As a result of the study, a fully-connected two-layer neural network was obtained, showing sufficient accuracy of predictions, which confirms the fundamental possibility of using machine learning methods to monitor the state of standard structures.
Keywords: vibration diagnostics, building construction, building, structure, defect, damage, machine learning, neural network
Currently, the problem of increasing the efficiency of managing resource-intensive tasks in distributed computing systems is quite acute. Analysis of existing task dispatching algorithms for traditional computing systems showed the limitations of using these methods in heterogeneous systems, as a result of which significant delays can occur between task switching.A functional mathematical model for estimating the workload of distributed computing systems is proposed, based on determining the probability of downtime of the processing center as a criterion for assessing the system load. Using this model will provide increased efficiency in managing resource-intensive tasks in distributed computing systems.
Keywords: mathematical model, distributed computing system, processing center, loading
In this paper proposed a method based on evaluation characteristics using reference points for cross-linking frames of images obtained from unmanned aerial vehicles. We analyze multi-route (area) aerial photography, which allows you to get images of the area from several parallel routes. The model developed by the authors for detecting reference points of aerial photographs obtained from any type of survey equipment carrier can be used for a wide range of tasks related to the reconstruction of anthropogenic and natural objects and the construction of 3D models for architecture and topography based on digital images.
Keywords: aerial images, image recognition, reference point detection, photo map, unmanned aerial vehicles
hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration.
Keywords: hydroxyapatite, non-collagenous protein, implant, quantum-chemical analysis, molecular model, one-electron spectrum, vibrational mode, osseointegration
The article deals with the problem of increasing the efficiency of the formation and further functioning of the organizational and technical structure. The leading factor in the formation of which is the availability of objects, with gradation by volume of work performed, purpose and type, conditions of work, which requires the choice of the method of organization of repair and construction works and planning of logistics. To solve this problem, it is proposed to develop a mechanism for managing organizational and technical structures based on the application of a program - oriented approach. This should allow you to create a system that is a continuous design with different implementation periods, regulated by the resource provision. To date, there is no unified approach to the formation of an effective organizational and technical structure. A tool for solving this problem, taking into account the features of the construction industry, is proposed.The article deals with the problem of increasing the efficiency of the formation and further functioning of the organizational and technical structure. The leading factor in the formation of which is the availability of objects, with gradation by volume of work performed, purpose and type, conditions of work, which requires the choice of the method of organization of repair and construction works and planning of logistics. To solve this problem, it is proposed to develop a mechanism for managing organizational and technical structures based on the application of a program - oriented approach. This should allow you to create a system that is a continuous design with different implementation periods, regulated by the resource provision. To date, there is no unified approach to the formation of an effective organizational and technical structure. A tool for solving this problem, taking into account the features of the construction industry, is proposed.
Keywords: Planning, major repairs, organizational and technical system, program, production support, structure, management, order method, cost, balance
The rapid development of infrastructure contributes to the development of building technologies and materials. Today, in addition to classic building materials, completely new technological composites - pultruded profiles - have appeared. These materials have a lot of advantages compared to classic materials, but this product also has a huge drawback - unstudied. To date, there are no widely accepted design standards or instructions available to practicing design engineers.As a consequence, now, most construction projects rely on manufacturers' design manuals, which are often incomplete and too cautious. The purpose of this article is to develop provisions for the calculation of structures of pultruded profiles
Keywords: pultruded profiles, stretched elements, calculation of stretched elements
The physicomechanical properties of paving slabs produced by vibropressing technology are determined. The compositions of fine-grained concrete using quartz fine-grained sands and very fine sands are proposed. The obtained results confirmed the possibility and effectiveness of the use of substandard fine-grained raw materials of the local raw material base, which ensure a reduction in the cost of production.
Keywords: fine-grained concrete, vibrocompression, raw material base, substandard sands, ground sand, active rheological matrix
The results of testing a series of 18 samples of joints for chipping along wood fibers are considered. The samples are made of glued wooden beam, intended for use as a supporting structure of the floor. To assess the strength of the adhesive joint in accordance with standard 33120-2014 “Wooden glued structures. Methods for determining the strength of joints”, statistical processing of test results was carried out, temporary shear resistance, coefficient of variation, range of variation series and the minimum probabilistic value of tensile strength were determined. Indicators are given to standard wood moisture content W = 12%. It was determined that the strength of the adhesive joint is less than the value established by current standards, by 18.5%.
Keywords: glued wood, wooden glued beams, adhesive strength, temporary chipping resistance, tensile strength, minimum probabilistic value of tensile strength, coefficient of variation, chipping during bending, standard wood wetness