bluuebunny/crossref_metadata_2025_split huggingface dataset:
Selection of Outdoor Climate Parameters for Designing of Ventilation and Air Conditioning Systems
Authors: Strongin A S , Vorontsov V A , Kuznetsov K A 
Published: March 2021

Abstract
The correct selection of the outdoor climate parameters for the design of ventilation and air conditioning systems in buildings allows saving initial costs and reducing energy consumption during operation. The article presents a method of statistical processing of long-term data of measurements of meteorological parameters and the results of calculations for various regions of Russian Federation. The required outdoor climate parameters such as air temperature, specific enthalpy and absolute moisture content, are presented in the form of tables, BIN diagrams and a climate map of a city.
Dynamic Loading of the Rod at a Sudden Change of Elastic Foundation Structure
Authors: Poddubny A A , Gordon V B 
Published: March 2021

Abstract
The mathematical model of dynamic process in the loaded constant evenly distributed load of structurally nonlinear system “beam - two-parameter foundation" is constructed, arising as a result of sudden change of physical and mechanical properties of the foundation, leading to zeroing of its shear rigidity. The solving of the static bending problem of a hinged beam fixed at the ends of the beam, supported by (если физически на него опирается, если нет, тогда operated) the Pasternak foundation, serves as an initial condition of the problem about the forced vibrations of the beam on the Winkler foundation, which occurred after a sudden formation of the defect. The solutions of static and dynamic problems are built using the method of initial parameters with the involvement of vectors of beam cross-sections states and matrixes of influence of initial parameters on the state of arbitrary cross-sections. To analyze forced vibrations, the decomposition of load and deflection of the initial static state into rows according to the forms of natural vibrations of the new state is applied.
Areas of Probable Air Pollution in Mountains and Valleys
Authors: Shukurov I S , Marakulina S P 
Published: March 2021

Abstract
Many cities of the world are located in river valleys or are associated with mountains. The article presents the characteristic landscape positions of many cities in the world. Among them is very important to study the wind regime, which is located in the conditions of the basin. In these cities, general pollution and deterioration of the microclimatic regime of the atmosphere are observed during periods of windless weather, and especially during inversions. It occurs either due to the gradual accumulation of harmful impurities of road transport under adverse meteorological conditions. The contribution of vehicles to the total air pollution is up to 80%. Currently, their composition of vehicle exhaust gases contains more than 200 different substances. With 95 … 99% of emissions t represent an aerosol of complex composition, depending on the engine operating condition and the composition of the mixture. The composition of the atmosphere of cities should meet the established standards for the content of the main components of air and harmful impurities (dust, gases), taking into account existing state standards. Biomedical requirements for the composition of air in cities are determined by the maximum permissible concentrations (MAC). However, the content of toxic substances in the air at the level of the MPC cannot be considered as the optimal composition of the air environment. In cities located in the depressions, deterioration of air exchange conditions is observed, which is associated both with a drop in wind flow activity and a decrease in the intensity of solar insolation per unit area of exposed surfaces of the slopes. In the work to improve the wind mode, the base for establishing the main stages for regulation is set to be direct; recycling; and combined i-recirculation direct-flow, as well as direct-flow-recirculation schemes of natural ventilation. The formulas for determining the criterion for evaluating the effectiveness of ventilation are given. We used computer modeling technologies that significantly simplify the analysis of the wind regime and reduce the time spent on research, the purpose of which was to compare the results of experiments in a wind tunnel with the data of virtual studies of the wind flow around natural wind patterns in a wind tunnel with the use of SolidWorks 2015, with the addition of Flow Simulation.
Investigation of Air Dust and Fine Dust of an Urbanizing Environment
Authors: Thi An Phan , Shukurov I S , Van Luong Pham , Shukurova L I 
Published: March 2021

Abstract
Hanoi is the capital of the Socialist Republic of Vietnam. The city is developing according to the following scheme: there is a central region and surrounded by satellites (5 cities), which are connected to the center using a transport system such as rail, road, river roads, etc. A high pace of economic development will cause environmental problems. Air quality is deteriorating due to an increase in population, means of personal transport, industrial and other sources of emissions; and all this has a strong impact on human health and the environment. According to WHO estimates, Hanoi is the city with the highest levels of dust pollution with annual average values of PM10 and PM2.5, which are both high at 73.5 μg/m3 and 47,45 μg/m3. This conference paper studies the effects of environmental pollution caused by fine dust PM2.5 during urbanization in the city of Hanoi, and some urban planning solutions to reduce pollution caused by fine dust PM2.5.
Expert Opportunities for Regulating Communication in the Network Management of Construction Production
Authors: Osadchaya N , Kliuchnikova O , Murugova E 
Published: March 2021

Abstract
The article deals with the problematic aspects of the examination of construction objects from the perspective of effective communication. The problem is considered from the perspective of an interdisciplinary scientific approach. It is proposed to use information and intelligent environments in the construction industry-software systems for BIM modeling and production management. The article notes the importance of expert solutions in the innovation process. Based on the information approach to the development of communications, we show the possibility of creating institutional forms of innovation in the management of construction production using software packages for BIM modeling and production management.
Calculation and Construction of Combined Steel Concrete Beams
Authors: Veselov V , Egorov V , Abu-Khasan Makhmud 
Published: March 2021

Abstract
The article considers combined steel-concrete beams of floors and coverings, crane structures, bridge spans, and analyzes methods for evaluating the stress-strain state of a steel-concrete beam. A number of steel-concrete beam designs protected by utility model and invention patents are proposed for use. A method for calculating a steel-concrete beam of a closed contour of any shape filled inside with concrete has been developed.
Influence of 3D-Printing Parameters on Bimetallic Products Manufacturing Process of Cu-Fe System
Authors: Osipovich K S , Gurianov D A , Chumaevsky A V 
Published: March 2021

Abstract
The article is devoted to selection of optimal parameters for manufacturing defect-free high quality products. Bimetallic samples with different parameters of modes were printed by the method of electron beam wire-feed additive technology. Materials of stainless steel 304 and copper C11000 selected for printing have different physical properties. Based on macrostructural research, the paper presents various external defects, which were formed in different modes of production. The study showed the effect of external defects on the formation of internal defects in experimental samples. It was noted that in addition to the basic parameters of the manufacturing process, such as beam power and wire feed rate, geometric parameters such as electron beam sweep diameter and substrate thickness play a major role. The article presents macrostructural studies of bimetallic samples of stainless steel 304 and C11000 made using different modes of production.
Strength and Deformability of Cement Composites of Various Types
Authors: Erofeeva I V , Emelyanov D V , Svetlov D A , Matvievskiy A A , Maksimova I N , Makridin N I 
Published: March 2021

Abstract
It is shown that the construction of buildings and structures requires concrete with universal characteristics, primarily with compressive strength in the range of 35-200 (MPa) with high tensile strength, crack resistance and durability. Strength and elastic-plastic and other properties of concretes and other cement composites are regulated by creating their various formulations. In this regard, it is important to conduct comprehensive studies of the properties of composites in relation to their compositions. Cement composites of various compounding compositions, including fillers, plasticizers, pigments, and biocidal preparations, are considered. Attention is also paid to the technological aspects of preparing mixtures and manufacturing products, namely, the influence of activated water on the properties of concretes of mixing and hardening conditions. Indicators of strength, modulus of elasticity, and brittleness were obtained for compositions that differed in the type of plasticizer (“Melflux 1641 F”, “Melflux 5581 F”, “Fortrace–strong”, “Hidetal-P-5”, “Hidetal GP-9” gamma “A”), a biocidal preparation (Teflex Antimould, Teflex Disinfectant, Teflex for Industrial sights), a pigment (iron oxide red, iron oxide yellow, green glauconito-vogo, meerkat iron). The influence on the properties of powder – activated concretes, rheologically active (rock flour), reactively active (micro - silica), fillers, as well as quartz sand fractions 0, 16 – 0.63 and 0.63-5.0 mm. The results of research showed an increase in the strength of concrete when using plasticizer “Melflux 1641F” and activated mixing water in the technology of their preparation. To increase the strength and modulus of elasticity led to the introduction of rock flour and silica. The introduction of plasticizers led to a decrease in the elastic modulus, and the use of activated closing water does not affect this indicator. From the examined compositions, compositions with the addition of pigments are characterized by increased fragility. The brittleness index of composites is mainly reduced when using the heat-and-water treatment mode compared to normal hardening modes.
The State and Prospects of the Issue of Assessing the Fire Resistance of Reinforced Concrete Structures
Authors: Portnov F , Kovaleva S 
Published: March 2021

Abstract
The paper considers the main approaches to assessing the limits of fire resistance of reinforced concrete structures. It shows what regulations are guided by the use of certain methods. The key elements of the evaluation processes were described. Practical examples show the advantages and disadvantages, in particular the impossibility of using calculated methods to evaluate new building materials and structures, the characteristics of which are significantly deviated from the available in the calculation manuals. The convergence of the results of the experimental method of assessment and computer modeling has been shown. Conclusions have been drawn on the need to optimize the calculated methods and the possibility of using modeling methods to pre-assess fire resistance limits to optimize performance, followed by experimental confirmation.
Theoretical Aspects of Production of Products by Hot Isostatic Pressing
Authors: Manyanin S E , Vaxidov Y S , Maslov K A 
Published: March 2021

Abstract
The role of powder metallurgy in the modern world is increasing every year. The introduction of new technologies in powder metallurgy contributes to the successful solution of complex problems in creating parts that have completely new, progressive properties. The development of powder metallurgy is mainly because its technological operations are relatively simple, and the effect achieved with their help in many cases is striking. One of the most promising methods for forming powder materials is the hot isostatic pressing method. This method allows the manufacture of materials and products with special compositions, structure and properties. However, to ensure the necessary characteristics and to eliminate defects in the finished product, it is necessary to strictly observe all technological operations of hot isostatic pressing.
Wear of Asphalt Concrete Pavements and Its Contribution to the Depth of the Rut
Authors: Aleksandrov A S , Dolgih G V , Kuzubov A U 
Published: March 2021

Abstract
The purpose of the article is to determine the contribution of wear of asphalt concrete pavement to the depths of ruts. The method of experimental research is field and laboratory tests. In the course of field work, the thickness of the asphalt concrete pavement in the core taken from the bottom of the rut, between the rut and side bulging of rut, if any, is measured. When performing laboratory work, the indicators of the physical and mechanical properties of asphalt concrete are determined in samples taken from the coating and in reformed samples. Laboratory data make it possible to judge the compliance of asphalt concrete with the requirements of the standard and evaluate its possible compaction by transport during exploitation. The difference in the thickness of the asphalt concrete in the cores taken from different points of the cross-section of the coating allows us to determine the amount of wear and calculate its share in the depth of the rut. As a result, share of the rut depth caused by the wear of the asphalt concrete pavement and the deformation of the structural layers of the pavement and the soil of subgrade were established.
Elastomeric Composites Based on Frost-Resistant Rubbers Containing Karelian Deposit Natural Schungite
Authors: Portnyagina V V , Petrova N N , Mukhin V V , Ovchinnikov N P 
Published: March 2021

Abstract
The article considers the problems of the operation of elastomers and elastomeric products in cold climates. It was shown that the combination of propylene oxide rubber (SKPO) and ultrafine polytetrafluoroethylene (UPTFE) was an effective way to obtain elastomeric materials with improved performance for operation in the northern regions. The general patterns of the influence of natural schungite on phase morphology and the properties of composites based on SKPO and UPTFE were investigated. It was found that with an introduction of small amounts of UPTFE (0.5-1 phr) the properties of elastomeric composites improve. It was associated with the structural features of the fluoropolymer. The particles of fluoropolymer had high activity, nanostructured organization, and the predominant concentration of fluoropolymer particles in surface layers of the material. The introduction of large quantities of UPTFE (50 phr) into the elastomeric matrix led to an improvement in the surface properties of the materials (wear and oil resistance). When substituting carbon black with natural schungite, both surface properties and physical and mechanical properties and compression set were improved. The obtained elastomeric composite will surpass many industrial elastomers by wear resistance and can ensure stable operation of seals under dynamic loading conditions (movable seals) and the presence of abrasives. Replacing carbon black in compositions based on SKPO and UPTFE with natural schungite will have a significant environmental and economic effect since it is much cheaper than carbon black.
Physical and Mechanical Properties of Films Based on Graft Copolymers of Chitosan with N, N-Dimethylaminoethyl Methacrylate
Authors: Mochalova A E , Salomatina E V , Pochina A N 
Published: March 2021

Abstract
The graft-polymerization of N, N-dimethylaminoethylmethacrylate (DMAEMA) on chitosan (CTS) was performed in the presence of ammonium persulfate (PSA) at a temperature of 323K. The effect of the DMAEM concentration in the reaction mixture on the copolymer yield, the degree and effectiveness of grafting, as well as on the physical-mechanical properties of films obtained on the basis of synthesized copolymers was studied. The copolymers formation was prooven by gravimetric method, extraction, and IR spectroscopy. Chitosan-graft-DMAEM copolymers of various compositions were obtained. The grafing degree reached ~ 350 wt. % with the ratio [DMAEMA]/[CTS] = 5 (mol/(base-mol), the grafting effectiveness was ~ 86 wt. % with the ratio [DMAEMA]/[CTS] = 1 (mol/(base-mol). It was established that the changing the copolymers composition lead to variation of tencile strength and deformation characteristics of films widely from 1.4 MPa to 25.7 MPa and from 34% to 413%, correspondingly.
Development of the Composition of Steel Fiber Reinforced Concrete for the Repair of Bridge Structures
Authors: Fedorov V I , Mestnikov A E 
Published: March 2021

Abstract
The article is devoted to the problem of increasing the service life of road networks, which, with an increasing flow of vehicles in harsh climatic conditions, becomes even more urgent. In such conditions, with the traditional approach to the reinforcement of the roadway of bridge structures, defects often appear on the concrete surface in the form of macrocracks and potholes in the protective layer. As one of the ways to solve this problem, the use of concrete with dispersed reinforcement with steel fibers for the upper layer of the pavement is considered, which makes it possible to increase its strength and impact strength. To determine the required amount of concrete mixture components with specified performance characteristics, a two-factor experiment was carried out, which made it possible to obtain a regression dependence of the ultimate compressive strength of steel fiber reinforced concrete at the design age, depending on the proportion of the mass of steel fiber on the mass of solid components and the proportion of the mass of organo-mineral additives from the mass of cement. The recipe of steel fiber reinforced concrete, developed on the basis of the experimental data, was tested during the reconstruction of one of the bridges of the A360 Lena federal highway.
Air Quality Upgrading in Residential Areas Using Architectural Methods
Authors: Balakin V V 
Published: March 2021

Abstract
According to results of natural observations in big cities and using building models, some optimum techniques for planning and development have been revealed providing hygienic norms of emission content from vehicles in main streets within the comfortable weather classes defined by combinations of wind speed, temperature, and air moisture. Patterns of air flow transformation were revealed by the speed and direction as well as distribution of polluting substances on the cross section of urban streets with variation of their width, height, and housing density. Planning conditions have been determined contributing to the formation of the stable vortex and the elevated air pollution resulting from the closed circulation of vehicle emissions in the street canyons. Possibilities to provide the air quality are determined under the conditions of the historically formed urban development by way of realization of planning reconstructive and organization regulative measures. Special aspects to choose and realize urban planning steps are chosen aimed at air protection in various geographic areas with a typical annual trend of changing climate forcing. It is highlighted that in landscape zones with a pronounced seasonal character of climate forcing, an individual approach to choosing urban planning methods is needed to regenerate the urban environment as applicable to problems arising in different seasons.
Modeling of Efforts on Cylinder of Boom Lift of Small Loader
Authors: Kudryavcev E 
Published: March 2021

Abstract
Article describes process of modeling of efforts on cylinder of boom lift of small loader. Article include analytical researches and modeling of interrelations of various parameters of the working equipment of loader and define efforts on a cylinder of boom lift, including and the maximum efforts, under various conditions of using. The proposed procedures of modeling allow to reduce time and costs of such calculations at least in several hundred times and effectively to define optimum parameters of the working equipment of such loaders, providing good visual presentation of received results.
A Study on Teaching the Kinematic Analysis of Structures (Based on the Approach Applied in Learning Process at Industrial University of Tyumen)
Authors: Shagisultanova J , Panfilov A 
Published: March 2021

Abstract
2020, the year marked by global pandemic, revealed a number of systemic weak points, including those in higher education industry in general and in teaching approaches to the discipline of Structural Engineering in particular, which would have remained uncovered under usual conditions. Earlier articles highlighted the positive impact of applying the workbook-based teaching method, developed by the authors of this article, on student learning. However, mass transitioning to online education has helped identify a series of issues that students had to face in the course of their studies. One of these problems included conceptual understanding of how the calculating model, especially a model of a statically indeterminate structure (building), was formed. This article is dedicated to the new methods of teaching kinematic analysis, which have already been put into practice in the virtual classroom of Tyumen Industrial University (TIU).
Vibration Characteristics of Railway Trains
Authors: Tsukernikov I E , Shubin I L , Nevenchannaya T O 
Published: March 2021

Abstract
The problem of predicting vibration on the territory of residential buildings adjacent to the projected lines of rail transport is considered. The concept of vibration characteristics of trains is introduced as an intrinsic characteristic of a vibration source, the knowledge of which is necessary to predict vibration parameters in an area of impact of lines. The substantiation is given for choosing the equivalent and maximum value of vibration velocity as the parameter of the vibration characteristic. For four generalized types of soils, the values of the maximum distance from the middle of the nearest track were obtained for the experimental determination of the vibration characteristics of a passing train. The assessment was carried out in the frequency range inherent in the vibration generated by rail transport on the basis of the insignificance of the influence of the soil parameters on the values of the vibration characteristics. This makes it possible to determine the values of vibration characteristics irrespective of the type of track structure and to consider the obtained value as an intrinsic characteristic of trains, which depends only on the parameters of their movement.
Features of Regulation of Heat Energy Consumption by Heating and Ventilation Systems in Agricultural Buildings
Authors: Biryukov S V 
Published: March 2021

Abstract
The article is devoted to the regulation of heat energy consumption by heating and ventilation systems, as well as to the design features of agricultural buildings. Approaches to the regulation of heat energy consumption and compliance with the standards of specific heat consumption of agricultural buildings with civil standards for the cold climate zone of the Russian Federation are given.