bluuebunny/crossref_metadata_2025 huggingface dataset:
Effectiveness of energy-saving glazing in various climatic zones of Russia
Authors: Korkina Elena , Shmarov Igor , Tyulenev Matvey
Published: July 2020

Transmission heat losses through the filling of the apertures are greatest through the entire envelope of the building, therefore, their reduction is of great importance for saving energy for heating. For this purpose, the installation of double-glazed windows with special energy-saving coatings is being carried out. The purpose of this work is to estimate the decrease in heat losses while reducing heat gains when replacing glass packs with energy-saving ones for the whole building. For this purpose, an indicator was introduced that is equal to the ratio of heat loss reduction, taking into account the decrease in heat gains when replacing glass packs with energy-saving ones. This indicator was calculated using the example of a building, presumably located in different climatic zones of Russia. This indicator can be used in economic calculations when evaluating the effectiveness of energy-saving glazing.
Dynamic problems of scientific support construction
Authors: Ter-Martirosyan Armen , Sobolev Evgeny
Published: July 2020

This article presents the results of scientific support of the project and construction, as well as geotechnical monitoring of the multi-storey residential complex Bogorodsky with four towers of 35 floors and a developed underground part of two floors in difficult geotechnical conditions. In the immediate vicinity of the building under construction there is a line of high-speed city tram. In addition, since the building has a status of increased complexity, it is necessary to take into account the seismic load. As part of the geotechnical tasks of scientific support, in addition to assessing the displacement of the designed building and assessing the impact on the surrounding buildings, the forecast of additional displacements of the base from the effects of ground rail transport and seismic was considered. The geotechnical forecast was carried out by the finite element method in specialized software. The calculations are based on flat sections taking into account the elastic-plastic properties of soils. In conclusion, the results of observations of the displacements of the building under construction and the surrounding buildings are presented. Displacement graphs of geodetic marks installed on the structures of the building and surrounding buildings are presented. A comparative analysis of the results of the geotechnical forecast and the actual situation at the construction site.
Soil and structure interaction investigation features
Authors: Sidorov Vitalii , Almakaeva Anastasya
Published: July 2020

The interaction of soils with underground structures is an important and complicated geotechnical problem, because a new stress-strain state is formed on their contact, associated with reduced strength properties of soils. To determine these characteristics, laboratory tests by direct shear scheme with stiff clay and loam interacting with a concrete surface were carried out. Soil samples were taken from a depth of more than 35 m in Moscow. The tests were carried out according to the “soil-soil” and “soil-solid surface” schemes with a speed of 0.005 mm/min for clay and 0.05 mm/min for loam. According to the results of laboratory tests, strains and deformations were obtained. Also, the strength reduction factors were determined equal to 0.53 for clay and concrete and 0.44 for loam and concrete. This coefficient is one of the main parameters characterizing the magnitude of decrease of the strength characteristics at the contact in numerical calculations. Moreover, two methods for modeling the contact zone of the soil massif and a single pile were considered in the PLAXIS 2D software package. In the first case, the problem was modeled with use special contact elements “interfaces”, which have zero (virtual) thickness, and in the second case, the contact zone was defined by a layer of soil of real thickness, for which the properties are equivalent to the properties of the virtual interface. The results of numerical modeling showed that the shear stresses on the contact in the case of a real interface will be less than when using a virtual interface, and the bearing capacity of the pile will decrease by almost 2 times.
The effects of morphometric elements of the channel on hydraulic resistance of machine channels of pumping stations
Authors: Bazarov Dilshod , Uralov Bakhtiyar , Matyakubov Bakhtiyar , Vokhidov Oybek , Uljaev Farokhiddin , Akhmadi Makhfuz
Published: July 2020

Presents the results of hydraulic studies in pressureless and pressure water conduits, the results of which showed that the dependences obtained for calculating the hydraulic resistance in round pressure pipes cannot be distributed without the corresponding adjustments of pressureless channels (provided that the diameter of the pipe is replaced in the corresponding calculations with a value where hydraulic radius). In particular, it follows (and this is confirmed by the data of the corresponding experimental studies published in the literature) that in the case of pressureless channels, the pressure loss coefficient, and therefore the pressure loss, depends not only on the relative roughness and Reynolds number, but also on the shape of the cross section the channel. Moreover, if for hydraulically smooth pressureless channels this dependence can be considered to a first approximation clarified, then for channels whose wetted surface is characterized by the presence of a certain roughness, the question of its influence, as well as the shape of the channel cross section on the pressure loss, is far from roughly approximate solution. The paper also considers the general equation of fluid motion in pressureless channels and the functional dependences of the coefficient of hydraulic friction on the Reynolds number, relative roughness, and on the shape of the living section of the channel; resistance formulas are first for the simplest with respect to the cross-sectional shape of the channels (round and infinitely wide rectangular), and then for channels with a more complex cross-sectional shape. To take into account the effect (on the pressure loss) of the channel cross-sectional shape and the presence of a flow with a free surface in it, additional correction factors are introduced (using the hydraulic radius concept) as well as new dependencies and formulas for determining the hydraulic friction coefficient are given, s taking into account the influence of morphometric elements of the channel on the hydraulic resistance of the machine channels of pumping stations.
Kinematic characteristics of the flow, in the compression region, with bilateral symmetric restriction by floodplain dams
Authors: Bakiev Masharif , Kaxxarov Uktam , Jakhonov Azizjon , Matkarimov Otanazar
Published: July 2020

Of great importance is the solution of the problem of research aimed at improving design methods and calculating the parameters of a bilaterally symmetrically constrained river flow with wide floodplains, for regulating river channels, protecting river banks from erosion and for the efficient use of floodplain fertile lands.The aim of this work is to develop a methodology for calculating the flow velocity field in the compression region, which is bilaterally constrained by floodplain transverse dams. Experimental studies were carried out in a schematizaron channel with a bilateral floodplain of rectangular cross section with parallel dynamic axes. It was experimentally established that the velocity distribution in the zone of interaction between channel and floodplain flows obeys the universal Schlichting-Abramovich dependence. The relative width of the interaction zone depends on the ratio of the depths of the channel and floodplain flows. The device of transverse floodplain dams to conduct to the appearance of areas of backwater, compression and spreading. In the compression region, the greatest longitudinal and transverse differences in depths are observed, as well as the velocity field with zones characteristic of jet flows: a weakly perturbed core, turbulent mixing, and reverse currents. The problem is realized for the compression domain by a joint solution of the equations of conservation of momentum and conservation of flow in the stream. Design dependencies are proposed to determine the patterns of change in speed in the channel and on floodplains. In contrast to existing solutions, the interaction of channel and floodplain flows, uneven velocity distribution in the zone of a weakly perturbed core, and transverse and longitudinal differences in depth in the compression region are taken into account. The combined use of experimental and theoretical solutions allowed the establishment of kinematic flow parameters in the compression region of the flow constrained by floodplain dams.
To assessment of stress-strain state in rock continua
Authors: Adilov Farkhadjan , Makhmudova Shakhnoza , Abirov Rustam , Toshmatov Elyor , Maxmudova Ikbal
Published: July 2020

The approach for calculation of stress-strain state of mine excavation in rock continua is described in this issue. Boundary element techniques are used here. Proposed method can take into account existing cracks in continua and its propagation under dynamic or static loading.
Equations of motion of mechanical systems with nonlinear nonholonomic servoconstraints
Authors: Khusanov Kahramanjon
Published: July 2020

The proposed paper is devoted to the derivation of equation of motion for the systems with nonholonomic servoconstraints, taking into account the release from servoconstraints containing only tangential components of reaction force of servoconstraints taken as control parameters. Chaplygin’s problems and a gyroscope in gimbal mount are considered.
Automation of vibration modes of soil compaction machines
Authors: Drozdov Anatoliy
Published: July 2020

The relevance of high-quality compaction of soil foundations during the construction of embankments and foundations during the construction of engineering structures is given. An effective vibrodynamic method of compaction of gravel and sand materials for foundations of building structures for various purposes is substantiated and proposed. The method of continuous monitoring of the degree of compaction of the soil by measuring the magnitudes of the amplitudes and frequencies of harmonic oscillations of the compacted surface is determined. A schematic diagram of the automatic control system CAP of vibration modes of shock-absorbing soil compacting machines with a crank-oscillating exciter is proposed. The principle of regulating the operating modes of a vibrating machine using an automatic control pulse distributor is stated. A structural block diagram of the CAP elements is constructed and an analysis of the dynamic properties that determine the optimal control time is carried out. The main elements of the CAP are determined and their work in the control program is shown: the frequency of impact of the working mechanism on the soil surface being compacted, depending on the degree of compaction. Key words: soil compaction degree, operating mechanism, amplitude and frequency of harmonic oscillations of the surface of the soil being compacted, vibro-shock machines with a crank-connecting rod exciter, automatic control system, control pulse distributor, process parameters sensors, on-board microprocessor controller.
Flexible concrete protective coating resistance to approach flow exposure
Authors: Yumahseva Maria , Bryanskaya Yuliya , Bryansky Ilya
Published: July 2020

In order to protect the bottom and coastal slopes of natural channels and artificial reservoirs from channel deformations, various shore reinforcing structures are often used. One of this structures is the universal flexible protective concrete coating. When using this kind of structures, it is necessary to take into account their interaction with the approach flow. At the flexible protective coatings operating, one of the problems is the “wrapping” of the coating body. To calculate the stability assessment of the surface coating, it is necessary to know the value of the coefficient of hydrodynamic resistance of the protective coatings. It is determined mainly by its shape. Currently, various forms of surface coatings from various materials are used. In most cases, the resistance of such structures is assumed approximately, based on the known values of the resistance coefficients of bodies of various shapes. As a rule, the elements of protective coatings have a specific form, the resistance of which must be established experimentally. The article presents the results of an experimental determination of the hydrodynamic drag coefficient of a universal flexible concrete protective coating (a universal flexible protective mat) on aerodynamic and hydraulic experimental stands. Used laboratory equipment with basic operating characteristics, examples of experimental models, and basic operating conditions during experiments are described. It is shown that the value of the coefficient of hydrodynamic resistance decreases with increasing Reynolds number. The obtained values of the hydrodynamic resistance coefficient in some cases exceed the values recommended for calculating the maximum permissible flow velocity when assessing the stability of a protective coating. It is concluded that it is necessary to experimentally evaluate the hydrodynamic resistance coefficient for each model of protective coatings. The recommended value of the hydrodynamic resistance coefficient for the studied modification of a flexible protective concrete coating is established.
Theory of stress-strain state of concrete faced rockfill dams
Authors: Sainov Mikhail
Published: July 2020

In spite of the fact that concrete faced rockfill dams began to be used long ago; their designing is based on empirical approaches and there is still no common theoretical concept about peculiarities of their operation. With the aid of numerical modeling the author studied conditions of forming stress-strain state (SSS) of a concrete face with consideration of impact of various factors. The used methodology of analysis took into account operation of the face not as that of the plate but as a 3D structure interacting with the dam body in a complicated way. This permitted obtaining new knowledge about the face operation. It was revealed that friction farces at the contact of the face with the dam body play the main role in SSS formation. Due to friction the concrete face perceives not only deformations of cross bending but also longitudinal forces and deformations of longitudinal bending. The most dangerous is the face lower section where the face is subject to tensile longitudinal force and longitudinal bending, which may result in appearance of transversal cracks in the face. Considerable compressive forces perceive the face in the direction from the bank to the bank. The new theoretical concept about the concrete face SSS dictates reconsideration of approaches to designing of concrete face rockfill dams. For decrease of tensile longitudinal force, the pattern of rockfill zoning in the dam body should not allow considerable difference in deformation of the dam zones; also it is necessary to decrease friction on the contact of the face with the under-face zone. “Soft” vertical joints should be arranged to decrease compression in the face in the direction from one side to the other side.
The methodology of geo-information monitoring system of oil pollution distribution in sandy soils near fuel station
Authors: Man’ko Arthur
Published: July 2020

This article considers the results of studies of possible permeability coefficient in sandy soils of oil products sold in bottling at fuel stations. Based on the results of the obtained data, a method of geo-information monitoring of the environmental condition of the existing or newly built fuel station of the environment is created to minimize the risk of possible pollution of the environment (soils, above-ground and underground waters).
Evaluation of Current Standards in Designing Cold-rolled Aluminium Channel Beams
Authors: Hieu Pham Ngoc , Hung Pham Cao , Rasmussen Kim J R
Published: July 2020

Cold-rolled aluminium alloy sections have been well known as new products of BlueScope Permalite, and have been produced by utilising the existing rolling system for cold-formed steel sections to successfully roll-form Channel and Zed sections in Australian market. The roll-forming approach is proven to be faster and more cost-effective as compared to the conventional extrusion method. This method has attracted the attention from the manufacturers and users as well as researchers which resulted in the ARC Linkage Research Project-LP140100863 grant funded by the Australian Research Council and BlueScope Permalite to perform research on these types of cold-rolled aluminium sections. One of the objects in this project is to evaluate the application of current design standards in designing cold-rolled aluminium alloy members which are necessary to propose modifications in Aluminium design standards. This paper presents the applicability of current Aluminium design standards including Australian Standard, American Specification and Euro code in designing cold-rolled Aluminium Alloy Channel Beams by using reliability analysis.
Impact of Discharge Structure Carrying Capacity on the Velocity of Water Reservoir Drawdown
Authors: Djabbarova Shakhnoza , Yunusova Farida , Masharifo Umidbek , Bobojanova Nodira
Published: July 2020

Water reservoir hydrosystems are built to control flow in time as well as to fight against flood. For this purpose, discharge structure carrying capacity is set with respect to structure class, water users water consumption schedule, provision percentage in accordance with regulations, not taking into account the impact of carrying capacity on operation of structures in water reservoir hydrosystem. The main goal of the given work is to determine the impact of discharge structure carrying capacity on drawdown velocity in Tupolang water reservoir. The task is accomplished with the account of discharge and outlet structure joint operation depending on water levels in the reservoir that drawdown velocity increases from 11.98 m/day to 16.1 m/day for low levels in the reservoir in narrow canyon. For other horizons drawdown velocity in the reservoir is observed to range from 4.62 m/day to 11.63 m/day. These velocities are tens of times higher than allowable normative velocities for drawdown (0.3÷0, 5 m/day), and it decreases the reliability and safety of earth fill dams in particular.
Prefabricated steel structures with a corrugated web (Part 1. Beam)
Authors: Ibragimov Alexander , Zinoveva Ekaterina , Rosinskiy Stanislav
Published: July 2020

This paper considers prefabricated steel structures with a corrugated wall. Their relevance of development, new improvements of existing beam structures and their application are substantiated. Composite beams are known and widespread, a significant drawback of which is the inseparability and the need for their production in the factory, even despite the enlargement as assembly unit. Beams of a composite I-beam are offered, but of a detachable section of individual elements (flanges - rolled steel: corner, channel, box section; web-profiled sheet). Particular attention is paid to be prefabricated - demountable and the possibility of their delivery to the installation site in a “detailed” form, assembly and installation in a building site, dismantling (if necessary), and reuse. Between themselves, fastening is carried out on self-tapping screws or bolts, which allows assembly at the installation site. For increase the rigidity of the corrugated wall without a significant change in geometric parameters, including web thickness, additional layers of the profiled sheet will be sufficient amplification. In addition, this configuration allows you to increase the bearing capacity. The advantages of the design of I-beams with corrugated web are revealed: accessibility of materials, repeated use of the beam, low laboriousness, cutting of elements and assembly can be carried out at the construction site, waste-free production, reduced transportation costs, the possibility of selecting a section depending on the load.
Features of modelling reinforced concrete structures in order to give fire resistance
Authors: Portnov Feodor , Kovaleva Sofya
Published: July 2020

The work explores the problem of assessing the limits of fire resistance of modern construction structures. Existing experimental methods are a fairly accurate way of assessing and are used in the certification of construction structures. Nevertheless, a significant problem in the development of new construction structures arises the problem of the need to conduct a large number of complex and expensive tests. Calculated evaluation methods are a reasonable alternative for pre-evaluating the effectiveness of the solutions developed. However, at present such calculations do not take into account the different types of design solutions and properties of new building materials. The work provides the results of experimental and calculated methods of assessing the limits of fire resistance. The analysis of the calculation results showed that when using regulatory documents in calculating the actual limit of fire resistance, the results differ by a maximum of close to 20 minutes. Thus, it can be concluded that the data obtained by the standards may produce inflated results. Currently, there are quite a lot of software products capable of solving such problems at a high level. One of the most powerful software complexes is ANSYS. This product allows you to construct a mathematical model of the object to conduct complex engineering calculations to determine the likely failure scenarios and parameters of control of the tensely deformed state of construction structures Object. A simulation of the behavior of a reinforced concrete slab during a fire, with the help of the ANSYS program, is shown.
Construction project organizational and technological parameters analysis
Authors: Lapidus Azariy , Kuzhin Marat , Shesterikova Iana
Published: July 2020

The article deals with the organizational and technological features of construction. Methods of optimization of values to the required level are considered. Recommendations are given on making changes to organizational and technological solutions and achieving the required indicators. Reducing the timing of work while maintaining the cost of the final product is the main condition for the organization of construction production. This can be achieved by developing network and calendar schedules with the correct sequence of work, the composition of teams, and optimal technological solutions. Adjustment of graphs is possible when determining the parameters of resource graphs and comparing them with normal values. The effectiveness of the applied optimization methods in terms of time and resources depends on the technological and organizational parameters of the designed building or structure. The calculation of the parameters of construction production is carried out on the basis of the conditions that each work is provided with all the necessary resources. In reality, all resources are always limited. All planning work comes down to a constant analysis of the use of resources and their redistribution. When scheduling work, it is necessary to link the objectives of the plan in as much detail as possible with the possibilities of their implementation, that is, with available resources. Adjustment of graphs is called work to improve certain parameters of the graph. Since as a result of changing the schedules, the calculated parameters are brought into line with the task, and some optimal option is not achieved.
Study of Rupture Mechanism in Concrete Girder Strengthened by External Fiber Reinforced Polymer Using Crack Analysis
Authors: Nguyen Van-Hau
Published: July 2020

In the concrete beam strengthened by using fiber-reinforced polymer (FRP) sheet, the failure of the beam in the design standard is considered as the delamination of the FRP sheet at the end of the concrete beam or break of the FRP sheet when its maximum strain reaches. However, as cracks always happen in bending concrete beam, the failure is predicted to occur between two adjacent cracks. This failure also occurs in concrete near the adhesive zone instead of delamination of the FRP sheet. By analyzing the crack formation of a concrete beam under flexure, the average strain of the FRP sheet at failure is assumed as the ratio of crack width and distance between two adjacent cracks. This assumption is consistent with the comparison of experimental data from the literature. The proposed maximum strain value values from assumption have a lower value than the strain of FRP sheet specified in design specification ACI 440-2R which is determined from pulling tests. Tests of FRP strengthened concrete beam under flexure rupture were conducted in the laboratory. The failure morphologies confirm that cracks of concrete beam affect significantly rupture type.
Investigation of water absorption of non-autoclaved foam concretes based on microsilica
Authors: Baranova A , Bygajchuk V
Published: July 2020

The article presents the results of a study of water absorption of non-autoclaved foam concrete based on microsilica. The dependence of water absorption by mass and by volume on the average density of foam concrete in the range of 500÷700 kg/m3 is derived. It is experimentally established that the water absorption of foam concrete based on microsilica the grade D500 by mass is 100, 9 %, by volume – 53.6 %, for the grade D700 – 64.3 % and 42.4 %, respectively. At the same time, a day after immersion in water, foam concrete the grade D500 gains an average of 69.7% from full water absorption both by mass and by volume, foam concrete the grade D700 – 66.1 %. Full of water absorption of non-autoclaved foam concrete based on microsilica reaches in seven weeks later. The difference in water absorption between the grades D500 and D700 by mass is 56.9 %, by volume – 26.4 %. The closed porosity of foam concrete based on microsilica the grade D500 is 26 %, and for the grade D700 – 32.2 %.
Cyclic testing of polypropylene fibre reinforced concrete
Authors: Korneeva I G
Published: July 2020

Annotation. The article studies fatigue limits of polypropylene fibre reinforced concrete under conditions of low-cycle loading of variable intensity. It presents the experimental data based on testing mode under load conditions with constant strain rate. When put to the cyclic test, polypropylene fibre reinforced concrete tends to experience changes in its structural properties. Accordingly, the study has a quantitative assessment of changes in the resistance potential for axial compression of both test concrete samples and prismatic samples subjected to cyclic loads.
Changes properties of concrete with cyclic low-temperature impacts
Authors: Pinus B I
Published: July 2020

The analysis of concrete fracture in the process of exhaustion of its frost resistance. Statistical regularities and kinetics of ultimate strength upper limit of microdestruction and deformative values are established. A steady decline in the fracture toughness was found during cyclical freezing and thawing (FTC). Fatigue transformation of concrete long-term operation in severe climatic conditions is characterized with an increase in the danger of brittle fracture.
Polymerasphaltconcrete together with the use of modified effective components
Authors: Rozina V E , Shestakov N I , Komarov A K
Published: July 2020

In this paper, we consider the possibility of joint use of polystyrene, its block copolymers and transformer oil to produce polymerasphaltconcrete. It is established that the properties of bitumen change when different polymers and their quantity are introduced into its composition. It was found that the introduction of polystyrene together with a plasticizer expands the temperature range of operation, which leads to an improvement in the physical-mechanical and hydrophysical properties of polymerasphaltconcrete. The regularities of the influence of the composition and quantity of polymers on the physical, mechanical and operational properties of asphalt concrete based on modified binders are revealed. It was found that the optimal amount of polymers and plasticizer is 3.5% and 10% of the mass of bitumen.
Construction and technical examination of wooden structures (on the example of a wooden country house)
Authors: Samoilenko E V , Peshkov V V
Published: July 2020

In practice, the construction of wooden buildings of low-rise residential construction is carried out based on the experience and knowledge of the builders, and does not agree with the legal framework of the construction industry. Therefore, many low-rise and garden houses are typical, unequal spacing of the beams, overestimated the distance between the bearing walls, the construction of attic floors without regard to bearing loads of the lower floors, uneven box joints timber, use of faulty material or materials from different batches with different parameters and characteristics. All these violations in the construction and operation of objects made of wooden structures lead to civil disputes in the framework of which it is necessary to conduct construction and technical expertise.
Use of secondary raw material for foam concrete production
Authors: Sherbin S A , Gorbach P S
Published: July 2020

The article discusses the problems of using secondary raw materials for the production of mixed binder compositions and foam concrete. The effect of ash and microsilica on the properties of low-linker binder compositions and large-scale foam concrete was studied.
Use of mica-based composite materials for radiation protection of buildings
Authors: Shishelova T I , Hramovskih M A , Chuvashev N F
Published: July 2020

Radioactive emission is widely applied in different fields of sciences, in various technologies, and in medicine. For its safe use the protective screens shall be used that limit the impact of radiation on a human being. The paper deals with study and analysis of opportunities for applying different materials for protecting buildings and premises from radiation. Studies have shown that phlogopite micalex has high radiation resistance. Calculations of masses of conventional panels made of different materials ensuring tow-fold and ten-fold attenuation of X-ray and gamma radiation are presented. Studies revealed that micalex is the most promising and economically feasible material that can be used for those purposes. A new area for micalex application, namely, for radiation protection of buildings and structures of different purpose has been proposed.
Conceptual framework for implementing energy-efficient technologies into construction
Authors: Gorbachevskaya E Y , Bezrukikh O A , Maletina T A , Safronov D A
Published: July 2020

The energy problem is becoming global every year. The reason for this is the growth of the world’s population and the intensive development of technologies, which causes a constantly growing level of energy consumption. The construction industry is the largest sector of final energy consumption, accounting for a higher share of consumption than in industries such as industry and transport. The relevance and versatility of the problem of improving the efficiency of energy-efficient technologies in construction determines the need to improve the methodological foundations of the mechanism for managing production and economic processes for the introduction of energy-efficient technologies. Improvement and implementation of current methodological foundations and principles will form a systematic approach to the issue of mass use of energy efficient technologies in construction.
Improving the energy efficiency of a residential building
Authors: Kartavskaya V M , Khoroshikh S A
Published: July 2020

The possibilities of introducing energy-saving technologies to increase the energy efficiency of an apartment building with a central heating system are considered. The efficiency of using heat energy will increase in accordance with the value of reducing heat loss to the environment. When implementing the project of the proposed energy-saving measures with effective overhaul, the energy efficiency indicator in terms of the specific consumption of thermal energy by a residential building can reach a value close to the base, and the efficiency class to normal D and claim to be increased C.
Assessing the energy efficiency of air-to-water heat pumps
Authors: Kuzmin S I , Zelenina A A
Published: July 2020

This paper considers the model of assessing the energy efficiency of energy generation by air-to-water heat pumps in the changing temperatures of heat-containing and heat-perceived environments. The results of the assessment of the heat transformation rate for different climatic areas are presented.
Research of the possibilities of SmartEnergyCoating applying for thermal insulation of engines in harsh climate
Authors: Pospelova I Y , Kornlov D A
Published: July 2020

The investigated SmartEnergyCoating is able to generate electricity independently, provide a stable temperature regime for some types of technological coatings, elements of machines and control systems. The article presents the results of investigation to determine the time of the efficiency of the composition elements for the possibilities of generating electricity by the temperature difference between the technological coating and an environment.
Energy efficient methods of protecting buildings from cold air flows
Authors: Yu Shelekhov I , Dorofeeva N L , Smirnov E I , Shelekhov M I , Dorofeev I A
Published: July 2020

In this work, we study new innovative methods for creating an additive temperature environment, study the influence of a new type of infrared devices such as air and air-thermal curtains on the living conditions and infiltration parameters of buildings and structures from penetrating cold air flows. For calculating these structures, the engineering and technical methods of V.M. Elterman was used, based on the methods of calculating heated air curtains of Soviet scientists V.V. Baturin, I.A. Shepelev, S.E. Butakov. Additionally, the method of calculating air curtains by M.E. Diskin was used. We studied the distribution of temperature fields in the gate area of the building, in which road transport is being repaired. The experiments showed that the best indoor microclimate is achieved by using dual-flow systems consisting of a heated air curtain and an air curtain. The study of thermoelectric systems showed that it is possible to recuperate about 500 watts of electrical energy in this case. Studies have shown that there are modern, innovative developments, use of which improves the microclimate in the rooms without spending additional energy resources.
Comprehensive optimization of the route, composition and parameters of transporting pipelines for various technological purposes
Authors: Chupin V R , Maizel D I
Published: July 2020

Pipeline transport is the most common in our country and abroad. All of Russia is entangled in a single system of oil and gas transport, which already permeate many European and Asian countries. At the same time, pipelines pass through swamps, pass through mountain ranges, cross seas and lakes. Group and district water pipelines cover thousands of populated areas, heat supply, water supply and sanitation systems cover cities and urban agglomerations. When designing such capital-intensive linear objects, one of the most important tasks is to trace them. The paper proposes to solve this problem in conjunction with the optimization of parameters of pipelines, pump and compressor substations, throttling devices and mating structures. The technique is based on a combination of discrete optimization methods and reflects the real processes of substantiating the structure and parameters of structures. The calculations of real pipeline systems showed high computational and economic efficiency of the proposed approach and its software implementation.
Development of closed systems of oil-field water treatment as a basis of ecological safety of oil deposits settlements maintenance
Authors: Dubrovskaya O G , Dubrovskiy D I , Zhmakov E V , Matushenko A I
Published: July 2020

The methods used for oil-containing sewage treatment and the efficiency of an existing water treatment system are dealt with in the paper. The importance of work is stipulated by the necessity of improvement of technical sewage conditioning systems of oil complex enterprises. To optimize the operation of the waste water treatment closed system, a block of sorption structures is suggested to be included in the filtering stage. This method allows to achieve the required quality both for using this water as return oil – field water and technical one. The use of Unisorb-Bio sorbent is substantiated to implement the treatment process of heavily polluted oil-containing sewage water. In the course of an experiment the optimal temperature of maximum sorption treatment is revealed. Sorption filtration rational modes are selected and scientifically based. The data obtained can be used in the design of closed systems structures of oil-containing sewage treatment.
Actual problems of the operation of apartment buildings
Authors: Khan V V , Dekanova N P , Khan P V
Published: July 2020

The issues related to the occurrence of accidents during the operation of multi-apartment residential buildings, and the contradictions between property relations, rights of use and liability of business entities in the current legal environment are considered. The analysis of typical accidents leading to significant losses is conducted. The significance of the main factors influencing the occurrence of accident situations, the amount of damage from accidents and the degree of responsibility attributed to various categories of business entities in terms of compensation for material damage are assessed. Options for solving problems are proposed, including technical solutions in terms of diagnosing and localizing accident situations, and measures to increase the efficiency of the organizational and legal basis for the operation of multi-apartment residential buildings.
Determining the cost-effectiveness of thermal energy production by air-to-water heat pumps
Authors: Kuzmin S I , Ivshina N A
Published: July 2020

This paper provides a methodology for identifying the cost-effectiveness of thermal energy generation by air-to-water heat pumps. The results of a comparative estimate of the cost of energy received and the profitability of the method under consideration are presented.
Variable geometry impeller centrifugal pump
Authors: Pankin A , Makotrina L
Published: July 2020

The article compares the energy efficiency of the pump installation in a changing flow rate for options without flow control and with regulation by reducing the shaft speed and trimming the impeller. A comparison of these methods. A description is given of the operation of the pumping unit with a self-trimming impeller and an algorithm for controlling it.
A promising water supply scheme for Khomutovo village (Irkutsk district, Irkutsk region)
Authors: Shcheglov A A , Sudnikovich V G
Published: July 2020

The article proposes a water supply scheme for Khomutovo village. The authors describe regulation options for domestic and drinking water supply from the existing water intake facility in Dzerzhinsk under uniform operation of pumps using a regulating capacity and a frequency converter without intermediate tanks.
Development and reconstruction of district water supply systems
Authors: Slepnev O K , Maisel I V , Chupin V R
Published: July 2020

The aim of the study is to develop a methodology for the comprehensive optimization of promising schemes of water supply systems, ensuring the selection of optimal water withdrawals taking into account water quality, structure and parameters of transporting facilities, as well as operating modes. An algorithm of theoretical, practical and methodological recommendations on optimizing promising schemes of water supply systems is presented. A new optimization technique for group water supply systems is proposed, which allows the complex to solve the following problems: to optimize the location and performance of water intake structures from surface and underground water sources; to optimize installation sites, productivity and composition of water treatment facilities; choose the route of group pipelines and their optimal diameters.
Management of the housing and utilities sector in small municipal districts
Authors: Zharkaya G F , Alekseev T N , Tsyrempilov D A , Krapivkina O A
Published: July 2020

The article deals with the issue of management of the housing and utilities sector in small municipalities, trends in the development of housing and communal services at the regional and municipal levels. It analyzes the literature on the research issue, presents problems of the housing and utilities sector, and analyzes the issues of wear of fixed assets in the housing and utilities sector. It assesses fixed asset renewal activities in the industry, identifies problems and determines development trends for the stagnant state of the housing and utilities sector in small municipalities.
The use of standard series plans in designing unique buildings: the case of V. A. Pavlov’s residential house in Irkutsk
Authors: Druzhinina I
Published: July 2020

The article analyzes the documents of the Ministry of Construction of Russia, which contain the methods for calculating the index of urban environment quality. It reveals the lack of the housing quality indicator in the sum of the indicators that compose this index. Rethinking of the experience of the standardized construction can be one of the ways to restore the balance of the quality of housing and public spaces. Using the example of V. A. Pavlov’s residential buildings in Irkutsk, the article shows a possibility to design high-quality modern dwelling, taking the basis of space-planning decisions for standard series as a starting point.
City identity: mechanisms of formation of design of the urbanized territories
Authors: Hokhrin E V , Smolkov S A
Published: July 2020

In article theoretical basics of the mechanism of formation of city identity and a condition of realization of ways of broadcast of specific lexicon of shaping and cultural tradition are covered. Due attention is paid to problems of preservation and development of city identity and also the solution of problems of formation of the modern urbanized environment. The methodology of a research of mechanisms of formation of design of unique units of an original image of the historical environment is formed on the basis of results of the analysis of specifics of activity and types of the spatial and functional organization of the downtown as style carrier. At the same time empirical researches of different types of identity are characteristic, owing to specifics of the territory and the multinational population of the country, transformations? society in the conditions of which the priority directions a research? are national and ethnic identity are characteristic of the period socio-political. Other local types of spatial identity remain almost poorly studied though questions of specifics and development of the cities and the territory? are key in a modern urbanism. The solution of the listed tasks allows to be objecting the choice of the generated options that is especially necessary in a designing process and design of the urbanized territories. The aspects of city identity of the historical environment of the cultural and public center of the Siberian settlement considered by us allow to perform the described operations over various types of dimensional sizes, from formation of a range of parameters to their comparative assessment and to receive as a result indicators of compliance of the studied structure of composition to the set standard. Results of a research confirmed the existing theoretical provisions, having proved thereby efficiency of a research.
Architecture of the University campus in terms of maximum energy efficiency
Authors: Nizamutdinova Z F , Krivchikov N E
Published: July 2020

This article presents an analysis and overview of the main energy-efficient methods in the aspect of the campus planning structure in order to preserve the maximum comfort of students in various weather periods, as well as technologies for adapting campus buildings. The purpose of the work is to determine suitable methods for applying energy-efficient technologies in Siberia, and to present possible proposals for using these technologies in relation to the architectonic appearance of University campuses in Irkutsk.
Public spaces as a factor of the quality of the urban environment (on the example of the city of Irkutsk)
Authors: Polyakova N V , Polyakov V V , Zaleshin V E
Published: July 2020

The article describes the relevance of the study of public spaces as an important element of the quality of the urban environment. Successfully functioning public spaces are called upon to solve a number of urban problems, including the social isolation of citizens caused by urbanization processes. The characteristic of public spaces of a particular city is based on an assessment of a set of attributes and related criteria developed by placemaking specialists. It is proved that this complex should reflect not only the general requirements for public spaces, but also the features of the city: the diversity of the socio-ethnic structure of the population, cultural and historical heritage, and the specificity of the existing urban environment. The characteristics of the four most visited public spaces of the provincial Siberian city of Irkutsk are fulfilled: the Kirov square; historical and memorial complex “Jerusalem Mountain "; Municipal Park “Yunost Island”; shopping and entertainment complex “130th quarter”. The results showed that the public spaces of the city perform a number of functions with varying degrees of success: best recreational and entertaining, partially creative and the function of storing the “collective memory” of the city. At the same time, the city does not have public spaces that fully meet the objectives of the development of urban society; this applies to both historical and newly created. Their main drawback is the inconsistency with the modern challenge for Irkutsk, namely, the solution to the problem of social inclusion of new citizens. Some measures have been proposed for City management to purposefully strengthen the elements of public spaces that implement the function of involving residents, especially migrants, in the public life of the city.
Plan of reorganization of the architectural space of military campus No. 19 for the needs of the Suvorov Military School
Authors: Skorikova N A
Published: July 2020

The possibilities of implementing of a project to adapt the buildings and structures of the former military campus No. 19 in Irkutsk for the needs of the Suvorov Military School are examined in the article. The author proposes a set of specific architectural and planning solutions. The principle of compact development and rigid functional zoning has been the basis for the proposed project. Recommendations for accommodation of the personnel, arrangement of the residential and educational premises, taking into account age-related characteristics and relevant legislative norms and requirements are given.