bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recent experience in solution of geotechnical problems during subway tunneling in Moscow
Authors: Khokhlov Ivan 
Published: January 2021

Abstract
Moscow subway is one of the world’s leaders in transportation. Moscow subway extension is a vital and urgent task for the authorities and engineers. Subway tunnelling requires using new design solutions, techniques and careful planning. However, widespread application of progressive construction methods does not always allow to achieve reliable efficiency in underground subway construction, mostly because of geotechnical risks impact. Mitigation of geotechnical risk becomes an actual task during subway tunnelling, providing security and saving costs and time. The most effective action to avoid geotechnical risk is scientific maintenance, which allows using the previous experience and making careful analysis, to choose the proper construction methods or develop an effective strategy during accidents.
Up-to-date technologies of constructing foundations on loose soil in the city of Moscow
Authors: Abelev Mark , Averin Igor , Karalli Daria , Kopteva Olga 
Published: January 2021

Abstract
The area of residential buildings constructed in various soil conditions in Moscow has amounted to more than 15 million square meters for the past 20 years. Analysis of the work performed in 1990-2010 showed that various design and survey organizations carry out design and engineering surveys in different ways.
Studies of the peculiarities of the construction of various objects in Moscow have shown a high efficiency of the examination of materials for geotechnical and envi-ronmental engineering surveys, as well as design documentation. There are cases when, in the course of construction work, the effectiveness of other, previously not provided for, design and technological solutions is confirmed.
Many possible emergencies of existing buildings, as well as the facilities under con-struction attached to them, unreasonable, expensive and ineffective design solutions were excluded in the process of special examination of the projects.
System of national standards for measuring and evaluating sound insulation
Authors: Tsukernikov Ilya , Shubin I L , Nevenchannaya T O 
Published: January 2021

Abstract
The features of international standards being introduced in the Russian Federation in the field of measurement and rating of sound insulation are considered. It has been noted that over the past eight years, on the basis of international standards, a system of fundamental national standards of Russia has been created to measure and evaluate sound insulation in buildings and elements of buildings and structures. The system includes five standards that establish technical methods for laboratory measurements of airborne and impact sound insulation, a standard that establishes approximate methods for field measurements of airborne and impact sound insulation, two standards for a single-number assessment of airborne and impact sound insulation, a standard that sets the rules for determining and application of the uncertainties of sound insulation measurement. In 2018, 2019, on the basis of international standards, drafts of two national standards were prepared on the methods of field measurements of sound insulation of building facades and their elements and sound insulation of airborne sound between two rooms in a building.
Innovative modular greening system for modern buildings
Authors: Korol Elena , Shushunova Natalia 
Published: January 2021

Abstract
For the sustainable development of the cities and auspicious environment for the life of future generations and the health of residents of the metropolis, it is very important to have not only comfortable housing, but also a healthy environment inside and outside it, and for this it is not at all necessary to live in rural areas. Today life in the city goes by at a very fast pace among the modern buildings. These are indispensable spaces for the life of every citizen, however, for the functioning and proper operation of the entire system of the human, it is necessary not only to move, but also to breathe the clear air. This is possible due to the plants in the urban environment, which are very few, and often the gas content and harmful impurities, together with CO2, exceed the maximum regulatory values in the air. The plants help to reduce them, and thus create a green environment for the population. Innovative modular greening systems for the roofs and facades of modern buildings, developed by the authors, possesses high manufacturability in comparison with competitors and help to the environment in general, which contributes to improving the health and longevity of people.
Expert Recommendations for Energy Improvements in Educational Facilities: Case Study-School Buildings in Azerbaijan
Authors: Mammadova G H , Mammadov N Y , Akbarova S M , Feyzieva G H 
Published: January 2021

Abstract
Energy efficiency and resource saving are the key parts of the state policy in Azerbaijan. They cover all areas of the economy, including the building industry and the educational institutions. Therefore utilizing of innovative architectural design and construction strategies, energy-efficient engineering equipment and renewable energy sources should be raised to the level of the current requirements. In pursuit of this aim, examining and evaluation energy consumption in the educational buildings at their operational stage are ones of the contemporary issues and offering recommendations by the implementation the energy improvements is crucial. This article makes research to find energy efficient opportunities and then suggest proper measures and recommendations for educational buildings, what solutions can be used in schools to reduce their energy consumption. There were examined some school buildings in different climate regions of Azerbaijan. There had been performed energy auditing of them and the results were processed by software. Technical data and results for 2 school buildings in Ujar and Lankaran are given here. The recommendations for energy improvements in educational buildings were proposed by the local experts-architects and auditors. Findings can be used for fulfilling a multi-disciplinary energy audit of any educational buildings.
Eigenwaves propagation in three-layer cylindrical viscoelastic shells with a filler non-uniform in thickness
Authors: Mirsaidov Mirziyod , Safarov Ismoil , Teshaev Muhsin , Nuriddinov Bakhtiyor 
Published: January 2021

Abstract
The paper provides the statement of the problem, the development of a calculation method and an algorithm to solve the problems of propagation and absorption of non-axisymmetric natural waves in layered dissipative-inhomogeneous viscoelastic three-layer cylindrical bodies. A detailed analysis of well-known publications devoted to this problem is given. The paper posed the problem of non-axisymmetric natural wave propagation in three-layer cylindrical shells with fillers, taking into account the theory of hereditary viscoelasticity. Dispersion equations were obtained and the dependence of the phase velocity on the wavenumber for the three-layer shells was constructed. A calculation method was developed based on the Muller, Gauss, and orthogonal sweep methods. The program (in C++ language) was compiled based on the developed algorithm. Numerical results were obtained for the complex phase velocity depending on various wavenumbers and parameters of an axisymmetric cylindrical mechanical system for the Kirchhoff-Love and Timoshenko hypotheses. The change in the real and imaginary parts of the complex phase velocity under various parameters of the system was investigated for structurally homogeneous and inhomogeneous mechanical systems. The results obtained by the Kirchhoff-Love and Timoshenko hypotheses are in good agreement but differ in the wave absorbing abilities. It was found that a decrease in filler thickness at a rigid inner shell leads to a rapid increase in the real and imaginary parts of the vibration frequencies.
Application of the theory of strength of materials to determine the shear stresses in beams with round holes
Authors: Saiyan Sergey , Paushkin Alexander 
Published: January 2021

Abstract
A study was carried out of the possibility of applicability of the theory of strength of materials to determine the shear stresses arising in sections weakened by perforation in the form of round holes, depending on the perforation parameters with a constant shearing force along the length of the beam. A method was proposed for the implementation of the Zhuravsky’s formula for a section weakened by round holes, in the form of dividing the cross section into two independent parts and determining the maximum shear stresses by methods of strength of materials. The reliability of this approach is confirmed by finite element analysis in the ANSYS Mechanical APDL software package. The results obtained can be used to determine the maximum shear stresses in perforated beams in cross-sections along the center of the cut.
Specifies of construction industry terminology and methods of analysis of the natural language sentences similarity by using isomorphism of their structures
Authors: Sak Alexander 
Published: January 2021

Abstract
This article discusses methods of automatic translation by analogy. Each dictionary entry in the online dictionary contains a certain number of examples highlighting the use of this lexeme in different contexts. The purpose of this study is to find an example from an online dictionary that most fully conveys the meaning of a word in a particular context. Based on the fact that natural language sentences can be represented as graphs, the author considers several methods based on set theory, graph theory and linear algebra to compare sentences in order to find the closest example in meaning. In addition to purely formal comparison methods based on syntax, the author presents methods for analyzing sentences based on the semantics of their components. The balance between syntactic and semantic structure when comparing sentences gives the best result for finding the correct meaning of the predicate, which ensures an adequate transfer of the idea of the sentence during translation.
Study of wave processes in elastic beams and nonlinear differential equations with moving singular points
Authors: Orlov Viktor , Gasanov Magomedyusuf 
Published: January 2021

Abstract
The main issue for building structures is to ensure its integrity. This is to some extent ensured by the study of wave processes in building structures using mathematical modelling and the identification of model parameters that guarantee the reliability of such structures. The article continues the study of wave processes in elastic beams on the basis of nonlinear differential equations previously published by the authors, in which the existence and uniqueness theorem was proved. At the same time, a feature of the nonlinear differential equation, a movable singular point, was associated with the location of the destruction of the structure. This paper presents a theoretical substantiation of the influence of the disturbance of a moving singular point on the structure of the analytical approximate solution. A priori estimates are obtained and numerical experiments are carried out, confirming the theoretical propositions.
Numerical simulation of fluid-structure interaction by the example of a flow past a cylinder with a flexible thin structure
Authors: Lantsova Irina 
Published: January 2021

Abstract
This article is devoted to the study of a numerical method of modelling fluid-structure interaction (FSI) problems, namely, optimization of computational resources. We consider a flexible thin-walled structure with clamped behind a fixed rigid non-rotating cylinder installed in a water channel. To solve the problem the “2-way FSI” mode of modelling in software ANSYS was used. The results are presented in tables and graphs in comparison with the data of the experiment and other authors.
Non-stationary temperature field of the heating device in the conditions of unsteady thermal field of the space
Authors: Akhverdashvili Robert , Gulkanov Aleksandr , Modestov Konstantin 
Published: January 2021

Abstract
The trend of the modern world is aimed at improving the energy efficiency of buildings and reducing unnecessary costs of heat and electricity. In view of this, heating systems are used with a periodic operating time, in order to reduce the cost of heat energy during periods of absence of people. As a result, this paper will consider a method for determining the temperature of a heating device, taking into account the heat accumulation by the metal body of the device and the heat carrier inside it, with changing environmental parameters, which will allow taking into account the accumulated heat during the heating system operation.
The fractional derivative type identification for the modelling deformation and strength characteristics of polymer concrete
Authors: Kirianova Ludmila 
Published: January 2021

Abstract
The article contains the comparative use analysis of fractional derivative three types (Riemann -Liouville, Caputo and model) at the Begley -Torvik equation when modeling the deformation and strength characteristics of polymer concrete. We also consider how to obtain a solution to the Begley -Torvik equation initial value problem for the fractional derivative model using a recurrent kernels sequence. Further, the correctness is substantiated of establishing the type and the fractional derivative order at the Begley -Torvik equation initial value problem.
Interpolyation in smoothing tin model of the earth
Authors: Inamov Aziz , Ruziev Ilkhom , Nurjanov Saatbay 
Published: January 2021

Abstract
This article deals with engineering (strategic site construction, buildings and structures, material cultural heritage sites), project (underground and overhead pipelines, railways, roads, power lines, fields and minerals, irrigation networks, hydraulic structures). Improved interpolation techniques for determining the most commonly used measuring heights in the process of land surveying, solving engineering problems on topographic maps and surveying land cadastral works (agriculture, fisheries) and the state cadaster illuminated. In addition, design of linear, dotted and field-themed objects, the study of absolute heights for volume measurements, the analysis of survey results in software for the geo-information system, the mapping of Earth’s dimensions, the determination of unknown altitude and land grinding. Optimized using an improved formula for implementation. In addition, there is a section with a relief section height within each relief interval, and traditional methods used to determine intermediate values have caused discomfort to specialists or users of this formula. In this paper, it is widely used that the formula developed can be used to develop a high-precision study of the absolute value of an unknown height and to develop a sequence algorithm for the implementation of modulation systems in the geo-information system family software.
Estimation of a motion equations system of a potential two-dimensional in a water flow plan to dimensionless form
Authors: Kondratenko Anatoly , Alexandrova Marija 
Published: January 2021

Abstract
In terms of stationary open water flow, the boundary conditions in the flow free spreading problem are reduced to a dimensionless form by the various coordinates and flow parameters’ transformations, including I.A. Sherenkov’s transformations, which bring the boundary value problem to a dimensionless form. It was found that the equations system itself can be reduced to a universal dimensionless form, but the boundary problem cannot be reduced, since the boundary conditions both at the flow outlet from a free-flow pipe and at the flow infinity downstream are not reduced to a universal dimensionless form. It is concluded that it is impossible to solve the boundary value problem once and then use this solution under any boundary conditions. It was also revealed that the problem solution depends on a dimensionless parameter-the Froude criterion at the flow outlet from the pipe. This proves that it is possible to build a universal graph, a universal method for solving the problem with Froude numbers at the flow outlet from the pipe more than unity or close to unity. But increasing the Froude number, it is necessary to build a series of graphs, and it is better to create a single theory, an algorithm for solving this problem.
Determination of calculating stresses on the depth of loess grounds of hydraulic structures
Authors: Xujakulov R , Rahmatov M , Nabiev E , Zaripov M 
Published: January 2021

Abstract
The processes of deformation and moistening of subsiding soils are closely related to each other. On the one hand, the deformations of subsiding soil depend on the degree of its moisture content, and on the other hand, they seriously affect the regularities of the process of moistening the massif. In connection with this, the improvement of methods for calculating the deformations of loess bases of hydraulic structures requires a thorough study of the process of moistening the massif and the influence on this process of the specifics of the impact and irrigation structures on the soil. The article presents the results of studies to determine the stresses on the depth of the loess bases of hydraulic structures in the Karshi steppe. It was established that the lateral pressure coefficient reaches its maximum during the period of the most intense manifestation of subsidence in the layer under consideration.
Research of the parameters of contour blasting in the construction of underground mining works in fast rocks
Authors: Norov Yunus , Karimov Yokub , Latipov Zuhriddin , Khujakulov Amirjon , Boymurodov Najmiddin 
Published: January 2021

Abstract
The article develops a methodology for studying the parameters of contour blasting during the construction of underground mine workings in hard rocks. Research has established the effect of the distance between the contour holes and the influence of the values of the coefficient of approximation on the efficiency of contour blasting.
Trajectory of sediment deposition at the bottom of water intake structures of pumping stations
Authors: Urishev B , Artikbekova F , Kuvvatov D , Nosirov F , Kuvatov U 
Published: January 2021

Abstract
The study of the causes and patterns of sediment deposition at the bottom of water intake structures of pumping stations, the negative impact of sediments on the efficiency of their operation is one of the important measures taken to improve the efficiency of the water recovery system. The issues of studying the determination of the deposition rate and the trajectory of solid particles at the bottom of structures were analyzed, and the main shortcomings and shortcomings in determining the parameters of particle deposition were identified. An equation is proposed that allows determining the trajectory of solid particles deposition taking into account their concentration in the flow, the main properties (density, geometric parameters) of particles and water flow, as well as the design dimensions of the pump station’s advance chamber. The obtained calculated results based on the proposed equation were verified by the results of the study of deposits at the bottom of the advance chamber of the operating pumping station, which showed that the spread of the obtained data does not exceed 7…12 %. At the same time, the smallest particles settle at the end of the prechamber in the water suction zone. The obtained data showed the possibility of using the proposed equation to determine the trajectory of sediment particles deposition at the bottom of water intake structures of pumping stations.
Mathematical modelling of bottom deformations in the kinematic wave approximation
Authors: Krutov Anatoly , Choriev Ruzimurod , Norkulov Bekhzod , Mavlyanova Dildora , Shomurodov Anvar 
Published: January 2021

Abstract
Two possible approaches for generalizing the kinematic wave model for deformable channels are being discussed in this paper, including the approximation in which the law of conservation of fluid mass includes erosion and sedimentation; and approximation that the fluid flow is determined by the kinematic wave equation without taking into account bottom deformations.
Systematic comparison of the results of calculations of self-similar waves for different values of the change in water flow was carried out as well.
Heli-drying units for drying fruit and vegetable products under conditions of Uzbekistan
Authors: Shaimardanov B , Abdurokhmonov Sh , Abdurokhmonova Sh , Ibragimova G 
Published: January 2021

Abstract
The article presents the results of research of solar drying plants for mechanization of preparation processes and organization of the drying process with a minimum energy consumption and maximum quality of finished products. The greatest effect is achieved when drying to low humidity, for example, drying fruit to a humidity of 2.5-3% is achieved in 4-16 hours, depending on the properties of the material to be dried. During vacuum drying, the rate of moisture evaporation increases, since the rate of moisture removal is proportional to the difference in water vapor pressure at the surface of the material and in the surrounding space. The efficiency of the process increases due to the lack of heat loss with the outgoing air.
Mathematical modeling of a hydraulic hitched system of gantry tractor with high clearance used in horticulture and viticulture
Authors: Shermukhamedov Abdulaziz , Annakulova Gulsara , Astanov Bekzod , Akhmedov Sh A 
Published: January 2021

Abstract
A mathematical model that allows comprehensive calculation of hydraulic hitched system (HHS) operation of a four-wheel gantry tractor with high clearance was developed in the paper. Analytical dependencies of angles, angular velocities and angular accelerations were determined, as well as the analogs of linear and angular velocities and link accelerations based on the kinematic diagram of the HHS hitch mechanism. A method for complex calculation of the HHS and a computer program using the Pascal algorithmic language were proposed on the basis of developed mathematical model. The changes in values of the driving force and re-sistance force on the hydraulic cylinder rod and the changes in fluid pressure in the hydraulic cylinder were calculated.
Free movement of mineral fertilizers and their mixtures in air
Authors: Khudayarov Berdirasul , Mambetsheripova Ajargul , Kuziyev Ulugbek , Sarimsakov Bakhtiyar 
Published: January 2021

Abstract
The object of research is the free movement of mineral fertilizers and their mixtures in the air after discharge from the centrifugal pneumomechanical apparatus, followed by the processes of distribution on the field surface.
The aerodynamic properties of the grains of mineral fertilizers or mixtures are different. Therefore, they are broken down into fractions during free movement in the air after being thrown from the centrifugal apparatus. A new pneumomechanical type equipment scheme was developed, developed and field tests were carried out using the method of assembling structural elements and the rules of classical mechanics, dedicated to the analysis of technological processes of centrifugal devices in existing and patent information materials and quality spraying of fertilizer mixtures. The expression was derived and calculated taking into account the fact that the rate of additional air flow decreases with distance, and the relative velocity of the fertilizer grains relative to it.
The centrifugal pneumomechanical device is designed to perform two functions simultaneously, the first is to throw mineral fertilizers, the second is to create an additional air flow and direct it behind the thrown fertilizer grains. The proposed centrifugal pneumomechanical type apparatus ensures even distribution of component fertilizer mixtures of different sizes, shapes and densities on the field surface.