bluuebunny/crossref_metadata_2025_split huggingface dataset:
Computation of Core Floor Slabs of Different Length
Authors: Vasilyev A S , Zemlyak V L , Plehanova E A 
Published: March 2021

Abstract
The purpose of this research is to study what the crosscurrent representation format of core slabs is for samples of different length, by investigating the effect of the above factors on the load-bearing and stress-related properties, as well as the cracking load. The authors examined samples of slabs of different length, freestanding and working in bending, with a cross-section in a natural form, in comparison with samples of similar length in an I-beam shape. The samples were systematically loaded an interval of one kN until the yield point of reinforcement in the tension area was reached. The authors completed a numerical study of core slabs in a nonlinear setting. The researchers designed load-deflection plots when modeling the corresponding lengths of samples with a natural and I-beam form of section. The scholars received and compared results with loading of the cracked condition, midspan deflections with a rupturing load. They found out that the length of the slab affects the calculation results of the shapes issued: the shorter the length, the more highlighted deviation in the load-deflection plots. The authors suggested correction coefficients to perform a refined calculation of slabs for cracking, deflection, and rupturing loads.
Development of Promising Technology for Manufacturing Parts of Gas Turbine Engines
Authors: Vdovin R A 
Published: March 2021

Abstract
This article discusses the results of the development of a promising technology for manufacturing parts of gas turbine engines. First of all, this technology is promising due to the use of the PolygonSoft system utilized for computer modeling of casting processes, which made it possible to evaluate the efficiency of the gating and feeding system, as well as to predict the appearance of casting defects (porosity and macrostructure discrepancies) and to develop a set of measures for their detection and elimination; second of all, due to the use of rapid prototyping which employs 3D printing of the master model, thus reducing the time and financial costs for the preparation of technological equipment. According to preliminary estimates, the use of rapid prototyping has reduced the cost of manufacturing 250 wax models by 15% in comparison with the traditional technology, and also reduced time costs by an average of 5-6 months.
Influence of the Methods of the Component Activation of Polymer Composites Based on Polytetrafluoroethylene and Carbon Fiber on the Operational Properties
Authors: Markova M A , Petrova P N 
Published: March 2021

Abstract
The article presents the dependence of the physical-mechanical and tribological characteristics on the manufacturing technology of polymer composite materials based on PTFE of PN grade and carbon fibers of UVIS-AK-P brand produced by OOO UVIKOM. Modification of polytetrafluoroethylene with a carbon filler provides low friction coefficient, and the wear resistance of composites increases by 77–2024 times in comparison with an unfilled polymer. The technological method of introducing filler through a concentrate applied in the present work has resulted in an improvement of the operational characteristics of composite materials compared to the initial polymer. Various technological approaches based on the methods of joint mechanical-chemical activation of components and milling of a polymer mixture, which contribute to an increase in operational characteristics, have been considered. The dependence of the operational properties of composite materials on the amount of filler in the polymer mass has been analyzed.
Technology of Manufacturing Small Piece Construction Materials Using Ice and Snow
Authors: Popov S N , Burenina O N , Andreeva A V , Savvinova M E 
Published: March 2021

Abstract
In the study, we present the technologies for manufacturing ice and snow blocks, the strength characteristics of which are sufficient for the construction of temporary low-rise structures (warehouses, garages, hangars, caponiers, and others). A technological feature of manufacturing blocks is the possibility to produce them without using specialized equipment. The technological modes of molding blocks and their thermal-physical and strength characteristics are determined. The blocks and a model of a single-story building with 3×4.2×2.3 m dimensions were tested on resistance to warming in the spring period. The results have revealed the possibility of a wide application of the proposed technologies in the North and the Arctic.
Integration Approach of BIM and GIS in Forming of the Upper Kama Architecture Database
Authors: Semina A E , Maksimova S V 
Published: March 2021

Abstract
The article address the issue of three-dimentional and spatial data integration applied to architectural heritage. Integrated approach of BIM and GIS models allow BIM models not to be limited in the description of buildings but also describe interactions of the object and surrounded environment, contributing to the management of the urban environment in an interoperable way. In this paper proposed the approach of division investigating objects on several scales. Movement from regional scaled data till building scaled data allows considering architectural monuments on every stage of the persistence. This approach described at the case study of surveying Upper Kama region. For this territory were identified several types of the environment. Within every of this types the morphology of architecture is described. All obtained data was divided considering scales and usage of BIM or GIS, or integrated models. Creation of certain model depends on analytical tasks. Such ways of the heritage digitization is a basis for future work on physical or virtual restoration.
Non-Canonic Representation of the Random Process in Tasks of Simulating Seismic Impacts for Calculating Buildings and Structures
Authors: Yerzhanov S Y , Lapin V A 
Published: March 2021

Abstract
The seismic impact model is analyzed as a combination of simple functions with random parameters. A random process simulating seismic impact is defined by a simple non-canonical representation. A method for generating artificial accelerograms of local earthquakes is proposed, based on the representation of the correlation function as the sum of cosine-exponential terms. The approximation parameters of the correlation function were determined earlier based on the least squares method using the MATLAB package using nonlinear approximation methods. As a quality criterion, the initial and generated spectral curves coincide. Samples of random process realizations from 20 to 10,000 realizations (artificial accelerograms) are used. Algorithms are simply implemented in modern computer mathematics systems MATLAB, SCILAB. The mathematical model of the accelerogram of the earthquake in El Centro, 1940 is also considered. The area of application of the algorithms is calculations using Eurocode 8 and ISO 2394, ISO 8930 standards, including using probabilistic methods, determining the reliability of buildings and structures based on the statistical test method.
Nanotoxicological Aspects of Post-Ischemic Myocardium Reconstruction
Authors: Beliaeva S A , Stelmashenko A I , Slepchenko G B 
Published: March 2021

AbstractSelenium (Se) is an essential atom in living organisms but some aspects of its metabolism and function remain unknown. Se large deficiencies cause significant disturbances of cardiovascular system and left ventricle (LV) fibrosis. The studies are needed to characterize the significance of Se in post-infarct LV dysfunction and postoperative remodeling. In Tomsk region, the level of Se in hair of healthy people and in myocardium of patients with ischemic cardiomyopathy was not changed. Chemical analysis of hair samples and myocardium of LV for Se content was based on a stripping voltammetry for determining the mass concentrations of this microelement. Nevertheless, a significant number of cardiac surgical patients showed a negative dynamics of postoperative LV myocardial remodeling with progression of heart failure. We obtained preliminary results on the direct relationship between favorable outcomes of postoperative adaptive myocardial remodeling (AR) and maladaptive myocardial remodeling (MALR) with variations in Se concentrations in the myocardium. At the same time, there were 84 % of cases with abnormal postoperative MALR of LV in the presence of extremely high (toxic) Se content in the myocardium. Further in-depth studies are required to translate novel data from the laboratory bench to the clinics.
Examining Beam Oscillations in the Space of Technogenic and Seismic Impact Parameters (Part I)
Authors: Kulterbayev Kh P , Oshkhunov M M , Baragunova L A , Kabzhikhov A A , Bulanov S G 
Published: March 2021

Abstract
Free transverse oscillations of a compressed beam carrying two evenly distributed loads and two discrete masses in the span are studied. The mathematical model of oscillations is presented as a boundary value problem from the basic equation in hyperbolic partial derivatives of the fourth order in spatial coordinates, of second order in time, boundary conditions and block connection conditions. The technical theory of bending oscillations of rods based on Bernoulli’s hypothesis is used. We consider the spectral problem on the determination of eigenvalues, eigenmodes (Sturm-Liouville problem), which is necessary for the analysis of forced oscillations. It is argued that the solution by analytical methods is inexpedient in view of the large amount of transformations and calculations. The methods of separation of variables and finite differences are used. An algorithm of task solution has been developed and implemented in the Matlab software environment in the form of high precision graphoanalytic calculations. Practical conclusions have been made.
Optimizing the Ingredients of Functional Foods
Authors: Kiselev V M , Kiseleva T F , Zubareva E N , Petropavlovskaya A V , Lipatova L P , Afanasyev M A 
Published: March 2021

Abstract
Conventional diets balance the multilevel, multifaceted needs by combining a diversity of foods into a daily menu. Such diets are compensatory by their nature. To compensate for the lack of some essential nutrients in foods, the body relies on the oversupply of some foods. The resulting diet is functionally disastrous; such dietary habits result in endemic and occupational diseases. Feeding on combined foods whose functional properties have been thoroughly adjusted helps properly balance the daily menu to optimize the intake of each nutrient, thus resulting in a higher quality of life, better health, saved foods, and lesser environmental impact. To optimize the composition and quantity of ingredients by the specified criteria so that the final functional food contains the required nutrient quantities, the authors hereof apply vector combinatorics. The paper summarizes the results of many years of research; it also articulates what else could potentially be researched further.
«Roadmap» for the Development of Eco-sustainable Habitat in Architecture: Innovative Approaches
Authors: Saprykina N A , Saprykin I A 
Published: March 2021

Abstract
The environmental priorities of the formation of the habitat space in the context of the paradigm of sustainable development of architecture as a challenge to civilization are considered. An environmental approach has been developed in architectural and urban practice as an alternative to the formation of architectural objects. Current trends and perspectives of the environmental approach in the formation of an eco-positive habitat in the context of the use of sustainability principles in the design of energy efficient buildings have been defined. Innovative approaches to the organization of the spatial environment of the future have been revealed, integrated ecological systems of automated building management have been considered, as well as environmental techniques for the formation of architectural objects using autonomous energy supply. The concepts of sustainable architecture in the context of eco-oriented thinking have been demonstrated. Bio-tectonic concepts of the organization of spatial habitat in modern conditions, as well as prospects and strategy for the development of sustainable architecture of the future have been defined. It is proposed to consider the “road map” of urban civilization in the context of the formation of a comfortable and safe spatial habitat.
Comparison of Calculated and Experimental Air Temperature in the Basement of a Residential Building
Authors: Kononova M S , Zherlykina M N , Kononov A D 
Published: March 2021

Abstract
Parts of buildings that have a fence in contact with the ground have some calculation features. One of the most important tasks is to determine the calculated air temperature in the basement of a building. As a result of the analysis of normative literature, it is revealed that there is no single methodology for solving this problem. To determine the correctness of the available calculation formulas, an experiment was carried out to measure the air temperature in the basement of a residential building. Measurements were carried out during two months of the heating season in the climatic conditions of the city Voronezh. As a result of processing the measured data, the dependence of the air temperature in the basement on the outdoor air temperature was determined. The resulting dependence is linear. Theoretical calculations of the air temperature in the basement at different values of the air exchange multiplicity and outdoor air temperature were also carried out. Comparison of calculated and experimental data showed that the discrepancy is minimal at positive outdoor temperatures. When the outdoor temperature decreases, the deviation of the calculated values from the experimental ones becomes more and more significant. The dependence of the temperature difference between the temperature of the basement and the outdoor air was also studied. The type of dependence obtained allowed us to offer a simplified method for determining the calculated air temperature in the basement.
Investigation of Stress-Strain State of Edge-Column Slab Connections on Finite Element Models
Authors: Filatov V B , Galyautdinov Z Sh , Kovalenko M V 
Published: March 2021

Abstract
The article presents the results of numerical research on finite-element models of flat girderless floors. The influence of geometric parameters on the magnitude and ratio of force factors that occur during the operation of a flat reinforced concrete slab was studied. Force factors include the combined action of the punching force and the bending moment. The variable parameters in the study were the flexibility of the column and the size of its cross-section. The purpose of the study was to substantiate the ratio of the bending moment and the longitudinal force in the column for the development of methods for conducting experimental studies on test samples. Based on the results of the study, the influence of the column’s flexibility and the dimensions of its cross-section on the ratio of the studied force factors was established. The study made it possible to choose the best option for loading test samples. The results of the study were used to conduct experimental studies on the punching of flat reinforced concrete slabs.
The Usage of Smart Materials for Development of Rehabilitation Orthopedic Device for Plantar Fasciitis Treatment
Authors: Gorokhova N , Perepelkina S , Sundkvist I 
Published: March 2021

Abstract
This article demonstrates the initial research results, related to the construction of rehabilitation orthopedic device for plantar fasciitis treatment. The results include the calculations of the pressure distribution, considering the human weight and individual gait peculiarities. Three calculation methods are considered: “theoretical” calculation, using the anatomical proportions of load distribution in human foot, empirical calculation, using weights coefficients and human weight distributions, and experimental calculation, using specific medical equipment. the Moreover, this article covers the usage of specific smart materials which can be implemented in the insole construction process. Each smart material has particular properties, considered in the functionality of the insole during the construction.
Effect of Nano-Aluminum Component on the Cement Properties
Authors: Kozlova I V , Zemskova O V , Semenov V S , Stepina I V 
Published: March 2021

Abstract
The possibility of using a nano-aluminum component in the cement composition has been considered. To ensure uniform distribution of the nano-aluminum component throughout the cement matrix, its suspension was stabilized using a sulfonaphthalene formaldehyde-based plasticizer and acoustic cavitation. It has been established that the nano-Al2O3 suspension is best stabilized when adding a plasticizer in an amount of 3-5 g/l and after an acoustic exposure at the optimal dispersion parameters: dispersion temperature–25±2 °C (the process is thermostated); dispersion time–20 minutes; and oscillation frequency-44 kHz. The study has shown that the compositions modified with a nano-aluminum component have improved strength and structural properties. On the first day of hardening, the compressive strength of the modified specimens increased by 20-24 % and at the grade age–by 31-35 % compared to the reference one. Introducing the stabilized nano-Al2O3 particles reduces the porosity for the first day of hardening by 12-13 % and at the grade age–by 27-29 %. It is recommended to add a nano-aluminum component as a stabilized suspension in an amount of 0.5-1.0 g/l to the cement composition.
Study of the Effectiveness of the Transition from an Open Heat Supply Systems to a Closed One
Authors: Biryuzova E A , Glukhanov A S 
Published: March 2021

Abstract
A promising direction in terms of improving heating networks is the transition from an open heating system to a closed one, which meets modern requirements fixed at the legislative level. However, the effectiveness of such measures is ambiguous. Despite the fact that closed systems maintain high quality water for hot water supply, stable hydraulic mode, automatic regulation of heat supply, their advantages are questioned. At the same time, open systems have significant advantages that, in some cases, give preference to: low corrosion rate of metal in pipelines and equipment due to the use of boiler-quality heat transfer agent that has been processed at a heat source, low cost of ITP, due to the lack of heat exchange devices that increase the cost of thermomechanical equipment, the use of exhaust steam from turbines of thermal power plants and thermal power plants, which increases the efficiency of heat supply. The disadvantage is the low quality of water for hot water supply systems and the need to replenish open heating networks with large volumes of prepared and treated water. A comparative analysis of costs in the transition from an open heating system to a closed one is devoted.
Unauthorized Building as an Object of Improper Civil Construction
Authors: Storozheva A , Dadayan E , Letyagina E 
Published: March 2021

Abstract
The purpose of the study described in this article is to identify the problematic issues that arise during the construction of unauthorized real estate. The study examines fair and unscrupulous actions of developers and proposes appropriate algorithms for solving the problems of regulating unauthorized civil construction projects. The authors analyze the indicators of improper construction of unauthorized construction objects.
Actual Issues of Control and Supervision of Construction
Authors: Storozheva A , Dadayan E , Letyagina E 
Published: March 2021

Abstract
The purpose of our study is to identify the problematic topics that arise during the implementation of measures by supervisory bodies in the construction of real estate facilities. The study examines the directions and ways out of these situations. On the example of a constituent entity of the Russian Federation, the Krasnoyarsk Territory, we analyze performance indicators of construction supervision and residential control services, determine effectiveness and need for state regulation of reconstruction, overhaul, redevelopment and construction of real estate objects through control measures.
Behavior of the Support Made of Concrete Grades B25 and B35, in the Conditions of Disturbed Ground Rocks
Authors: Batarshin V , Semiokhin A , Gulevatenko A 
Published: March 2021

Abstract
When building underground structures in difficult mining and geological conditions, there is always a question of comparing the price and quality of the materials used. During the construction of underground structures in complex geological conditions. The purpose of this article is to select concrete for lining, which will meet the optimal technical and economic parameters in the conditions of disturbed ground rocks in the South of Kazakhstan.
Mathematical Model of a Filter for Water Treatment Using Biofilms
Authors: Bobyleva T N , Shamaev A S 
Published: March 2021

Abstract
The paper considers the principles of constructing a mathematical model of water treatment based on the use of a biologically active layer, the bacteria of which absorb harmful impurities contained in water. A system of equations is presented on the basis of which a model of water purification is constructed in the simplest element, which is a rod covered with a biofilm. The system of equations is a system that includes a parabolic equation in a three-dimensional domain and a hyperbolic equation on a part of the surface of this domain, connected to each other through a boundary condition and a potential in an equation of hyperbolic type. Next, an asymptotic analysis of this system is carried out, which allows us to reduce the model of an individual element to the solution of a simple ordinary differential equation. On this basis, a model of the entire water treatment device is proposed.
Autonomous Air Shutoff Valves and How They Work in Northern Climate
Authors: Slobodchikov E , Struchkov E 
Published: March 2021

Abstract
For the Republic of Sakha (Yakutia), effective and reliable ventilation of buildings is imperative for human comfort and for appropriate air change. Demand for wall vents is rising in mass housing construction. However, practical experience has shown that neither domestically made nor imported vents are suitable for the Republic’s cold climate. At the same time, improving the airtightness of building envelopes remains indeed a relevant undertaking in the context of providing a comfortable indoor microclimate.
Evaluation of the Effectiveness of Alternative Options for Strengthening Inclined Sections of Beams with Prestressing Reinforcemen
Authors: Belutsky I Y , Alekseeva I D 
Published: March 2021

Abstract
The article provides an assessment of the effectiveness of technical solutions to strengthen the beams of spans of road bridges and indicates the advantages of using alternative reinforcement options in comparison with known solutions. The necessity of considering the collaboration of concrete and reinforcing elements on the principal planes of the webs of beams of the span is revealed. A method for determining the period of serviceability of a span is presented, as well as the dependence of this parameter on the strength characteristics of concrete beams. Calculated data are presented that allow critically assessing the effectiveness and the possibility of using various options for increasing the period of serviceability of the span of road bridges. The obtained results allow drawing conclusions about the validity and effectiveness of the proposed solutions for strengthening the span, as well as the prospects for using typical structures of previous generations in modern operating conditions.