bluuebunny/crossref_metadata_2025_split huggingface dataset:
Account the resistances under the action of the suction
Authors: Kudryavtsev S A , Gersenshteyn I S , Sultanova Y M , Lee M 
Published: May 2021

Abstract
In this paper we’ll show the interrelation between pressure suction and suction object. Suction force and air flow rate are determined as a function of the air pressure supplied to the suction. Here (unlike the earlier works) airflow losses are taken into account. In casethe gaps between the suction surfaces are either too small or too large, suction force is replaced by repulsion. The math expressions that describe the interrelation between air flow rate and suction force will help us to choose optimal suction parameters.
Test planning and evaluation of maintainability indices of engineering products
Authors: Kukhtik M P , Makarov A M , Barabanov V G , Stegachjov E V 
Published: May 2021

Abstract
One of the most important issues of maintainability of engineering products is an experimental evaluation of quantitative maintainability indices. It is necessary to plan maintenance and repair tests of products to obtain estimates. The analytical dependencies to determine amount of check and determinative tests and value of specified maintenance time for the cases of normal and exponential distribution laws of maintainability indices have been derived in the article. The numerical examples of calculation of amount of tests and evaluation of maintainability indices of engineering products have been represented.
Assessment of printing cylinder deformation effect on nature of load distribution
Authors: Serkova L B , Varepo L G , Kolozova O A , Belyaev P S , Bezzateeva E G 
Published: May 2021

Abstract
Various loads have a significant effect on the operation of different equipment components. Modern national and international studies show high efficiency of applying finite element methods to research into the loading nature of various parts and systems as a whole. Unevenly distributed loads can reduce the performance of the equipment, as well as lead to the failure of components. This paper examines the effect of the position of the substrate gripper system on the deformations in the printing cylinder. The findings prove that the misalignment of the shaft and gripper bridge placement doubles the resulting deformations.
Research of the electrical complex of a conveyor with two wire drums
Authors: Domanov V I , Domanov A V , Meshchaninov I A 
Published: May 2021

Abstract
The electrical equipment and control system of the conveyor conveyor electric drive are considered. The functional and structural diagrams were drawn up. The analysis of the operation of one-and two-drum electric drives is carried out. Structural diagrams of the mechanical part of the conveyor were obtained. A mathematical description was compiled and modeling of the investigated electric drive was carried out. The structure and model of the elastic link are compiled taking into account the friction forces. The use of a smoothing filter in the speed reference circuit makes it possible to eliminate fluctuations in the system from the reference signal. A mathematical model of the electrical complex has been compiled and its modeling has been carried out. The results obtained confirm the effectiveness of the application of the corrective coupling based on the elastic moment signal.
Detection of network attacks by deep learning method
Authors: Tatarnikova T , Bogdanov P , Kraeva E , Stepanov S , Sidorenko A 
Published: May 2021

Abstract
In this paper, we discuss the possibility of using a neural network approach in solving the problem of detecting network attacks. The neural network is designed to solve the problem of classifying the transmitted traffic into not containing an attack and containing an attack. The difficulties of using a neural network in this problem are discussed. Difficulties are associated with the choice of significant information features for the formation of the date set and having as many training examples as possible for each type of attack. Solutions for the selection of significant information features are proposed. It consists in ranking the features in order of importance. A method and rules for ranking features are proposed. In the future, it is proposed to use only important features to train the neural network. The problem of uneven number of training examples for each type of attack is considered. It is proposed to preserve significant examples represented by small sample sizes by assigning weights to them. Experiments show the effectiveness of the proposals discussed in the paper.
A Cascadic Multigrid Algorithm on the Shishkin Mesh for a Singularly Perturbed Elliptic Problem
Authors: Tikhovskaya S V 
Published: May 2021

Abstract
A two-dimensional linear elliptic problem with parabolic and regular boundary layers is considered in the unit square. It is solved by using an upwind difference scheme on the Shishkin mesh which converges uniformly with respect to a small perturbation parameter. The scheme is resolved based on an iterative method. It is known that the application of multigrid methods leads to essential reduction of arithmetical operations amount. Earlier we investigated the cascadic two-grid method with the application of Richardson extrapolation to increase accuracy of the difference scheme uniformly with respect to a perturbation parameter for a linear elliptic equation with parabolic and regular boundary layers and the cascadic multigrid method with the application of Richardson extrapolation for a linear elliptic equation with regular boundary layers. In this paper a cascadic multigrid algorithm of the same structure is studied. We also used an interpolation formula uniform with respect to a perturbation parameter and an extrapolation of initial guess using numerical solutions on two coarse meshes to reduce the arithmetical operations amount. The application of the Richardson extrapolation method based on numerical solutions on the last three meshes leads to increase accuracy of the difference scheme by two orders uniformly with respect to a perturbation parameter. We compare the proposed cascadic multigrid method with a multigrid method with V-cycle with a special restriction operator. The results of some numerical experiments are discussed.
Research minimax and minisum Weber problems on a plane with forbidden zones
Authors: Zabudsky G G , Veremchuk N S 
Published: May 2021

Abstract
Weber problem is a well–known location problem of connected facilities. Two optimality criteria are considered. The first criterion is minimization of the total cost of connections among facilities. The second criterion is minimization of the maximum connection between facilities. This article deals with Weber problems on a plane with rectangular forbidden zones. Location inside in the forbidden zones is not allowed. The sides of forbidden zones are parallel to the coordinate axes. To measure distances rectangular metric is used. An overview of studies for these problems is provided. Some properties of the problems are described. For example, the possibilities of reduction of admissible areas in the search for an optimal solution are presented. Variants of different bounds of the objective functions are provided. Models of integer linear programming with Boolean variables are given. Computational experiments with using the branch and bound algorithms, the constructed models and IBM ILOG CPLEX package were carried out. Usage of the properties of reductions of admissible areas is promising both in solving of the problems by combinatorial methods and using the integer optimization apparatus.
Computer geometric modeling of quasi-rotation surfaces
Authors: Beglov I A 
Published: May 2021

Abstract
The paper presents an analytic description of quasi-rotation correspondence. The formulas for calculation of values characterizing geometric objects are provided on the basis of constructive description of the quasi-rotation correspondence. The values characterizing circles generated through quasi-rotation of the initial point are calculated. A system of parametric equations describing a generic quasi-rotation surface is provided. Every type of curvilinear second-degree axis – circular, elliptic, parabolic, and hyperbolic – is considered. An algorithm for surface modeling through computer algebra systems has been developed on the basis of the analytic description and tested by means of Maple software. The algorithm allows one to acquire plots of separate sheets of the surface as well as all four sheets simultaneously. The capability to acquire 3D models of quasi-rotation surfaces given the desired shape and mutual location of the axis and the generatrix is demonstrated. The developed algorithm is applicable to any flat generating curve belonging to the axis plane and defined by a single-parameter system of equations. The resultant 3D model polygon count is user-defined and only limited by computer’s processing capability assuring high surface quality. The images of several four-sheet quasi-rotation surfaces are provided. The developed algorithm allows one to design surfaces of pre-defined properties.
Critical point analysis of an irregular surface model
Authors: Kuchkarova D F , Achilova D A 
Published: May 2021

Abstract
The article discusses approaches to modeling a surface by its discrete values. Possible passage positions are shown when modeling the surface according to the amount of information. Existing classification schemes for models according to the structure of input data are considered. The difference in the concepts of mathematical modeling in a narrow and broad sense is shown. The concept of an irregular critical point of a surface is considered, which is associated with the concept of the rank of a map. there are two types of metric points metrizing a given space. The definition of the curvature of the vertex and the degree of curvature is given. Types of points on the surface are defined. a method is proposed for determining irregular (critical) points of a surface by differentiating a matrix of initial data. Here the second partial and mixed derivatives are calculated. Possible cases of analysis of each vertex of the surface are considered. For each vertex, its degree of curvature and the type of vertex are determined. The original matrix with the source data is converted to a new matrix, where the elements show the type of vertex for each point. The task of identifying the desired model is reduced to constructing it in each cell.
Investigation of the electro-technical complex with alternative energy sources
Authors: Belyaev P V , Podberezkin D A , Golovsky A P 
Published: May 2021

Abstract
The article considers hybrid electric power complexes. The prospects of their development are shown. The expediency of using alternative energy sources for sustainable electricity and heat supply to consumers is proven. A mathematical model of an autonomous electrical complex with a fuel cell and a photovoltaic station as power supply sources is presented. The necessity of taking into account mutual influence of individual subsystems of the electrical complex, as well as their influence on the complex as a whole is reasoned.
The algorithm for selecting the optimal voltage class of the gas field power supply system, taking into account the entire life cycle
Authors: Bogachkov I M , Khamitov R N 
Published: May 2021

Abstract
The paper proposes an algorithm for choosing the optimal voltage class of a power supply distribution grid of gas well clusters, in which there is a multiple electrical load increase during field’s life cycle. Building a mathematical model with considering factors allows to design both a trunk line and a single radial grid and evaluate the magnitude and direction of the influence of individual factors, i.e. to conduct a quantitative analysis of the gas field power supply diagram. An extreme experiment is used to construct mathematical models. The optimization parameter is accepted as economic-the minimum of discounted costs. The paper presents six response functions-regression equations. The distribution grids of a number of operating gas fields in Western Siberia have been investigated taking into account the entire life cycle of the field at “PRON” computer program. The proposed algorithm can be used in the design of the power supply system for new gas fields, which allows to select the optimal voltage class for the power supply system of gas clusters, considering the entire life of the gas field, taking into account the minimum discounted costs. It can improve the efficiency of decisions, reduce funds and design time.
Experimental study of the boiling process in a fire-tube boiler with different heat transfer fluids
Authors: Slobodina E N , Mikhailov A G 
Published: May 2021

Abstract
Currently various boiler modifications differing in the types of heat transfer fluid used andin the heat exchange conditions in the boiler working area are presented on the market. To improve the boiler efficiency, it is necessary to take into account the peculiarities of the heat exchange process during convection or boiling depending on the properties and type of the heat transfer fluid used.
Experimental investigation of the effect of laser radiation on evaporation of a liquid
Authors: Trushlyakov V I , Novikov A , Panichkin A , Lesnyak I , Averchenko A , Sevoyan V 
Published: May 2021

Abstract
To study the process of model liquid (ML) evaporation under laser irradiation, two experimental samples (ES) in the form of ML reservoirs have been developed: an experimental reservoir with transparent walls, ES1, and an experimental reservoir of metal ES2, as a prototype of a future porous structure.
The processes of ML evaporation under constant and discrete laser radiation (LR) of different power were studied.
The program and methodology of experiments were developed and preliminary results of ML evaporation processes were obtained, including: current mass and temperature for ES1, ES2. The advantage of the discrete mode of exposure LR over constant mode of LR is shown. In the discrete mode of LR at a distance of 10 mm between the focus of LR and the surface of ES2 at a power of LR of 60 W evaporated ML by 4% more than at constant LR, and at a power of LR of 90 W evaporated ML by 22% more than at constant LR.
Effect of heat treatment temperature on the properties of silicon dioxide films derived from film-forming solutions
Authors: Kozlov A G 
Published: May 2021

Abstract
The effect of the heat treatment temperature on the physical properties of sol-gel silicon dioxide films derived from film-forming solutions is investigated experimentally. The dependencies of the thickness of the films, their refractive index, electrical strength, resistivity, etching rate, and the level of internal mechanical stresses on the treatment temperatures in the range from 700 to 1150 °C are obtained. It was found that the dependencies of the electrical strength, the etching rate, and the level of internal mechanical stresses have the sections with the different characters. The transition region between these sections corresponds to the heat treatment temperature equal to 900-950 °C.
Investigation of hydrogen permeability through nickel membrane by mass spectrometry method
Authors: Strunin V I , Khudaibergenov Zh G 
Published: May 2021

Abstract
Dynamics of hydrogen permeability through nickel membrane is studied; diffusion coefficient and time of hydrogen penetration through membrane are calculated. As a result of the work, it was revealed that hydrogen diffusion through the nickel membrane occurs, and it has a saturation character one day after the application of the solution. The obtained results make it possible to evaluate the process of flooding of quartz resonators of thermostats (QRT) housings in a chemically aggressive environment and in conditions of high humidity.
Experimental studies of a valveless non spool-type pneumatic percussion mechanism of a hammer
Authors: Gruzin A V , Abramenkov D E , Gruzin A V 
Published: May 2021

Abstract
Performing different kinds of activities, both in mining companies and in construction of industrial, housing and civil facilities requires specialized equipment provided with attached active operating elements, for example, pneumatic hammers. The analysis and selection of a schematic diagram of a pneumatic percussion mechanism are performed using known elements-features and structural additional expanding elements-features. This allowed a development of a new design of a valveless non spool-type pneumatic percussion mechanism of a hammer, for which analytical studies of its operating modes using a mathematical model were conducted. Experimental studies were carried out with an experimental sample of a pneumatic percussion mechanism to specify the reliability of parameters for the proposed mathematical model.
Comparison of modeling the natural frequencies and vibration modes of a sound isolation panel fragment with full-scale tests
Authors: Romanenko E A , Russkikh G S , Sokolovskiy Z N 
Published: May 2021

Abstract
The article discusses the results of modeling natural frequencies and modes of vibration, performed in the Ansys Workbench software package in comparison with a full-scale experiment. The aim of the study is to verify the model built in Ansys Workbench. The results allow us to make a conclusion about the adequacy of the model and the possibility of its application for solving the problem of determining the natural frequencies and vibration modes.
Elastic wave propagation in a cylinder with external active friction
Authors: Sultanov K S , Khusanov B E , Rikhsieva B B 
Published: May 2021

Abstract
Wave propagation in an elastic cylindrical body interacting with an external moving absolutely non-deformable medium (a cage) under a shock load on the front end is considered. The friction force arising on the contact surface directly depends on the parameters of the propagating waves and, due to the external medium motion,-it is active. The stated one-dimensional problem is solved analytically by the method of characteristics. Exact solutions are obtained for the stress wave propagation in a cylinder. An increase in the wave parameters with time and distance was determined; the influence of the parameters of external load and the physical and mechanical characteristics of the cylinder on the parameters of the increase in propagating waves were determined. The place and time of equalization of the velocities of the cylinder particles and the external medium motion, and the stress state of the cylinder particles, were discussed.
Experimental study on the complete stress-strain curve of gangue aggregate concrete
Authors: Bai Guoliang , Su Yuxiang , Liu Hanqing 
Published: May 2021

Abstract
In order to study the complete stress-strain curve of Chinese YuShenFu district’s gangue concrete. This experiment contains seven groups of gangue concrete which are all made by different water cement ratio and different gangue replacement rate, altogether 15 standard prismatic specimens. After the axial compression of concrete’s specimens, stress-strain curves of gangue concrete were obtained. In order to study the complete stress-strain curve of gangue concrete. In this paper, 15 coal gangue prism samples (150mm×150mm×300mm) were prepared for axial compression test. The main parameters are water-cement ratio and replacement rate of gangue aggregate. The result shows that there are four stages including the whole process of gangue concrete under uniaxial compression, but the descent stage exists the phenomenon of sudden break-down. Based on the data, the gangue concrete complete stress-strain curves’ constitutive equation is fitted. The parameter of ascending section fits favorably and the parameter of descending section is dispersed.
Influence of Thermal Alternation on the Interface between Insulation Layer and Bonding Mortar
Authors: Zhu Shaofeng , Wang Yaqun , Wang Yuxi , Su Fukang 
Published: May 2021

Abstract
The safety of the external thermal insulation system has been widely concerned by people. In this paper, strain gauges and temperature sensor are preset at the interface of bonding layer/insulation layer, bonding layer/mortar layer. The interface stress variation rules of graphite polystyrene board, polystyrene board and homogeneous board were studied under 30 times of thermal alternating environment and the test results were analyzed in combination with physical properties of the materials. The results show that the strain at the interface of the samples composed of three kinds of thermal insulation materials increases with the increase of the number of thermal alternating cycles. The total interfacial strain of the sample composed of homogeneous board is the largest, and that of graphite polystyrene board is the smallest.
Mechanical properties of a new string capsule drainage anchor and its supporting effect in deep foundation pit
Authors: Yuan Fanglong , Yang Zhijun , Chen Yuntao 
Published: May 2021

Abstract
With the increase of the scale and depth of urban underground space construction in coastal soft soil area, the traditional anchoring technology has been difficult to meet the requirements of deep foundation pit excavation and support. This paper puts forward a new type of string capsule drainage anchor supporting structure, introduces its structure composition, analyzes its working mechanism and mechanical characteristics, the calculation formula of ultimate bearing capacity of small cylindrical shear failure between anchor and surrounding soil is given, finally, the supporting effect of the new structure in deep foundation pit engineering is simulated and analyzed by finite element software. It is concluded that the stress of the new type of anchor can be divided into three stages: static earth pressure, plastic zone development and plastic zone breaks through; the new anchor can quickly dissipate the pore water pressure in the surrounding soil, which is more conducive to the stability of foundation pit; the axial force distribution presents a “sawtooth” shape, and the axial force increases sharply in the expanding section; the supporting effect of the new anchor is more obvious than that of the traditional anchor, which can more effectively inhibit the horizontal displacement of the slope.
Parametric analysis of the influence coefficient of round-end concrete-filled steel tubular members
Authors: Wang Erlei , Xie Jianxiong 
Published: May 2021

Abstract
The long-term load has great influence on the internal force distribution, deformation, bearing capacity and other mechanical properties of round-end concrete-filled steel tubular member. Parameter analysis is carried out on the influence coefficient kcr of the round-end concrete-filled steel tubular members under the influence of long-term effects. The parameter analysis results show slenderness ratio, concrete strength, steel content and load eccentricity have great impact on the influence coefficient kcr.
Mechanical performance analysis of U-shaped steel-concrete composite deep coupling beam
Authors: Zhiren Yuan , Jiayue Ding , wang Ren , Jianhong Fan , Junfei Niu 
Published: May 2021

Abstract
In this paper, semi-span simply supported beam is used to simulate the mechanical behavior and failure mode of U-steel reinforced concrete composite-deep coupling beam, and three U-steel reinforced concrete composite beams, with same height-span ratio of 1/3, were tested under one-point vertical concentrated loading in mid-span. Theresults show that the mid-span yield height exceeds 60% of U-steel-concrete composite beams flange, and that the three of U-steel-concrete composite beam specimens aredamaged, there is a critical oblique crack in the inner concrete of the beam that is roughly parallel to the line between the bearing center and the loading point. It is concluded that the failure mode of this type of U-shaped steel-concrete beam begins with yieldat mid-span bottom and flanges of U-shaped steel, and ends with concrete shear failure.