bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical study of the effective modulus of elasticity of three-dimensional mechanical metamaterial
Authors: Akhmetshin L R 
Published: August 2020

Abstract
Metamaterials are of great interest due to their unusual properties and promising practical application. The paper studies a mechanical metamaterial bar composed of 81 unit cells. The unit cell is shaped to a cube the faces of which consist of two-dimensional tetrachiral elements. The elastic deformation of a metamaterial specimen is numerically modeled in uniaxial loading. How the twist angle and Young modulus of the metamaterial specimen depend on the parameters of the chiral structure is demonstrated. Value ranges of the parameters in which the twist angle is largely affected are found. Cell parameters that have the greatest and least influence on the metamaterial twist angle and Young’s modulus are determined. The effective Young’s modulus decreases by a factor of approx. 20 when changing the inner radius of the ring. An almost constant effective Young’s modulus is found.
Structure formation features of large block-shaped samples from the copper and aluminum alloy produced by the wire-feed electron-beam additive technology
Authors: Knyazhev E O , Panfilov A O , Kalashnikova T A , Kalashnikov K N , Gusarova A V , Chumaevskii A V 
Published: August 2020

Abstract
In this work the study of the structure of samples made by the wire-feed electron-beam 3D printing from copper C11000 and aluminum alloy AA5056 was carried out. The presence of a dendritic structure typical of this method was revealed, as well as the presence of pores, cracks and other defects that occurred during printing. Mechanical properties of samples cut in the planar section are at a rather low level. The ultimate tensile strength of copper block samples varies between 165 and 187 MPa. The relative elongation of samples without pores is at 18%, but with the presence of pores it decreases sharply to 7%, while the strength is practically not decreased. The samples of alloy AA5056 demonstrate slightly higher mechanical properties: the strength is at the level of 190-192 MPa and the relative elongation is about 16-18%. In samples with defects such as large pores or discontinuities, the strength drops to almost zero.
Computational modeling of boric acid droplet entrainment during water-water energetic reactor operation in emergency boiling mode
Authors: Sahipgareev A R , Shlepkin A S , Soshkina A S , Morozov A V 
Published: August 2020

Abstract
The results of a computational modeling of the processes of droplet entrainment of boric acid by a vapor stream in the event of an emergency at a water-water energetic reactor (WWER) nuclear power plant associated with a guillotine rupture of the main circulation pipeline and the loss of all alternating current sources are presented in the article. The dependence received in the course of computational modeling makes it possible to estimate the maximum size of the droplets carried away by the steam stream during the emergency process in the WWER reactor unit during the operation of the complex of passive safety systems in the pressure range 0.2-0.5 MPa. It was established that to the end of 72 hours of an accident the maximum size of droplets carried away from reactor is 0.11 mm.
Evaluation of elastic modulus of carbon fiber reinforced polymers using an optical extensometer
Authors: Lyubutin P S , Burkov M V , Eremin A V 
Published: August 2020

Abstract
The paper presents the results of application of different techniques for processing of digital image correlation data. The algorithms are described and applied for determination of elasticity modulus of carbon fiber reinforced polymer specimens tested by uniaxial tension. Two ways of evaluation of elongation along with two methods of elastic modulus calculation resulted in four techniques which have shown quite similar results with a scatter of 0.5-2%.
Study of the Stability of the Gallium-Containing Catalyst in the course of Conversion of Gaseous C1-C6 Hydrocarbons into Aromatic Compounds
Authors: Vosmerikov A V , Barbashin Ya E , Vosmerikova L N , Vagin A I 
Published: August 2020

Abstract
A study was made on the duration of the single-pass lifespan of the gallium-containing catalyst in the course of conversion of a model mixture of C1-C6 hydrocarbons into aromatic compounds. Using temperature-programmed desorption of ammonia, it has been found that some acid sites of the catalyst were irreversibly deactivated as a result of the reaction and oxidative regeneration. It has been shown that the gallium-containing catalyst characterized by high activity and stability in the course of aromatization of lower alkanes was able to withstand a certain number of reaction-regeneration cycles without reducing its activity.
Chemical codes identification based on periodic dependences of chemical element distribution in biological objects
Authors: Otmakhov V I , Kuskova I S , Obukhova A V , Petrova E V , Sarkisov Yu S 
Published: August 2020

Abstract
This work for the first time considers the periodic dependences of logarithm of chemical element concentration in human hair, animal hair, crude drugs and other objects of flora and fauna of Siberia on the atomic number in the periodic table. The hypothesis is put forward that the maxima on the constructed curves can serve as the original code reflecting their interrelation with various factors of a genetic and ecological nature. The samples of the animal origin, blood-sucking insects and fish are selected in Siberia (the Tomsk region), whereas the samples of the drug plants are taken in the Krasnoyarsk region. The diversity of the objects at issue and the regions for sampling is conditioned by the breadth of challenges this paper faces. The chemical element concentration in the objects is determined by the detection limit of the method applied (from 1· 10–5 to 104 µg/g and more). For convenience, this element concentration is represented as logarithmic charts. It is shown that periodic dependences of the living world of Siberia and Siberian regions are of the same genetic nature. In this research performed in the certified Environmental Monitoring Laboratory of the Tomsk Regional Core Facility Center of National Research Tomsk State University we use the Spectrometer “Grand” with a multichannel analyzer of emission spectra.
Design of SiO2 materials with hierarchical structure as promising supports for catalysts
Authors: Zubkov A V , Vyshegorodtseva E V , Bugrova T A , Mamontov G V 
Published: August 2020

Abstract
The silicate support with a hierarchical structure based on diatomite and MCM-41 is synthesized. The MCM-41 is formed directly on the surface of diatomite and from the diatomite itself without the use of additional silica precursors. The structure of the synthesized samples is characterized by the low-temperature nitrogen adsorption and scanning electron microscopy (SEM). It was shown that hydrothermal treatment of diatomite with NaOH and cetyltrimethylammonia bromide leads to the partial dissolving of diatomite with self-assembly of MCM-41 fragments inside diatomite pores. The developed approach has demonstrated the opportunity to obtain the supports based on diatomite and MCM-41 that are characterized by a hierarchical structure (macropores of diatomite with size of 10-500 nm and mesopores of MCM-41 with size of 3-4 nm) and a high specific surface area that is promising for their application as supports for catalysts.
Laboratory study of the oil displacing ability of a chemical acid oil-displacing composition
Authors: Sholidodov M R , Altunina L K , Kozlov V V , Chernova U V 
Published: August 2020

AbstractThe paper presents the results of laboratory experiments to study the filtration characteristics of models of a heterogeneous reservoir of a Permian-carbon deposit in the Usinsk mine and the oil-displacing ability of a chemical acid oil displacing composition (AODC). The experiments were carried out on a setup for studying the filtration characteristics of heterogeneous reservoir models. The study found that the use of AODC will lead to a significant increase in the coefficient of oil-displacement.
Effect of bismuth ion implantation on the crystallization temperature of the amorphous Ge2Sb2Te5 thin films
Authors: Lazarenko P , Kozyukhin S , Sherchenkov A , Yakubov A , Zaytseva Yu , Dronova D , Boytsova O , Chigirinsky Yu , Zabolotskaya A , Kozik V 
Published: August 2020

Abstract
Bismuth doped Ge2Sb2Te5 thin films were prepared by magnetron sputtering of Ge2Sb2Te5 target with following ion implantation of Bi. Thin film compositions and elemental distribution across the film thicknesses were determined. An amorphous state of the as-deposited undoped and Bi-doped Ge2Sb2Te5 thin films was confirmed by X-ray diffraction. Temperature dependencies of the resistivity for Bi-doped Ge2Sb2Te5 thin films were measured. Two resistivity drops due to the crystallization and transformation from the cubic to hexagonal structure were determined. Decreases of the onset temperatures for the first and second transitions from 169.3 to 120.3 °C and from 188.0 to 153.0 °C with the increase of Bi concentration were found. It was shown, that the resistivity of the amorphous films sufficiently decreases with Bi concentration, while the variation of resistivity for the crystallized state is much smaller.
Modelling of sand cement hydration in normal conditions
Authors: Abzaev Yu A , Gnyrya A I , Korobkov S V 
Published: August 2020

Abstract
The paper considers the hardening mechanisms of the sand cement composition (0.75 sand and 0.25 Portland cement) during 28 days. In this study, the VCCTL tool is used for computer modelling of the sand cement hardening process. It is found that after 28 days, the sand cement hydration is ∼0.75, the porosity is over 0.20 and 0.32 at the water-cement ratio of 0.40 and higher, respectively. Calcium silicate hydrate (C–S–H) and portlandite (CH) are the main hydration products of Portland cement and responsible for the sand cement strength. Owing to the high porosity of sand cement, free moisture is present in it in large quantities. It is shown that the effective elastic moduli of sand cement rapidly grow during 200 hours and then monotonically lower. The yield stress monotonically grows during sand cement curing, and at 0.40 and 0.44 water-cement ratios achieves the maximum value. This growth thus depends on the water-cement ratio and affects Young’s modulus during the curing process. At the qualitative level, a correlation is observed between the yield stress and Young’s modulus depending on the curing time of sand cement with the discussed water-cement ratios.
The deformation characteristics of the modified heat-insulating foam concrete
Authors: Steshenko A B , Latypov A D , Ryabtseva N E 
Published: August 2020

Abstract
The present paper investigates deformation characteristics of natural hardened cement based foam concrete with chrysotile asbestos fibers and crystalline glyoxal. The given study is relevant as new methods for managing volumetric changes during the porous cement compositions operation are required to be developed. These new methods should allow obtaining high-quality, energy-efficient wall structures for application on the territory of the Russian Federation. Chrysotile asbestos fibers and crystalline glyoxal applied within the technology of cement foam concrete of natural hardening contribute to ensuring the increased deformation characteristics of concrete at the age of 28 days. The optimal compositions of heat-insulating foam concrete with the elastic modulus of 1035-1383 MPa, Poisson’s ratio of 0.1127-0.1446 and shear modulus of 465-604 MPa have been developed. The elaborated composition and technology of foam concrete production with glyoxal-containing additives is intended for use in the wall structures as well in monolithic construction as in pre-cast production.
Inhibition of tumor cell proliferation in vitro using atmospheric-pressure plasma jet
Authors: Evtina A A , Nekhoroshev V O , Buldakov M A , Cherdyntseva N V , Landl N V , Korolev Y D 
Published: August 2020

AbstractThe effect of atmospheric-pressure plasma jet on the proliferative activity of tumor and normal cells was studied. It was shown that under certain parameters, plasma jet inhibits the proliferative activity of tumor cells up to 75%. However, the reaction of normal cells under the same parameters of plasma exposure is different. It was found that low-temperature plasma jet stimulates the proliferative activity of normal cells up to 25% on the 5th day after exposure. The obtained data indicate the prospects of using this low-temperature plasma jet in biomedical research aimed to minimizing the negative impact on healthy tissues during antitumor therapy.
Software implementation for transfer functions of arbitrary order on managing controllers
Authors: Alekperli F A , Bayramova I S 
Published: August 2020

Abstract
Despite the great capabilities of controllers of the Simatic type, their library lacks a block for implementing the transfer functions necessary for programming complex control algorithms both in research by simulation and in industrial applications. This article discusses a method for software implementation of transfer functions of arbitrary order and delay in the Tİ A (Totally Integrated Automation) environment. The programs compiled in SCL and LAD languages and examples confirming the validity of the proposed method are given A program is presented that implements the solution of a difference equation in the SCL language, as well as programs for implementing the factorial and the number of combinations. These programs are designed as functions. The fourth program, compiled in the LAD language, is designed to build a transient process for a given transfer function in real time. The created software blocks allow developing software for the study of fairly complex regulatory systems by simulating and adapting to real industrial conditions without much difficulty.
Optimization of the algorithm for identifying digital traces of schoolchildren in the Altai Territory
Authors: Zhuravleva V V , Manicheva A S , Feshchenko A V , Berestov A V 
Published: August 2020

Abstract
The use of digital traces of social networks users has gained great popularity in various studies with the development of methods for analyzing big data. When processing data from social networks users, the problem of the incompleteness of the provided information arises (age, educational institution, year of admission/graduation are not specified). Users with such gaps do not fall into the field of view of the university as a result the number of potential applicants is significantly reduced. The aim of the project is to develop an algorithm for restoring information in a digital trace of a social networks user and its application to identify the group affiliation of schoolchildren whose digital trace contains incomplete information on the grade and place of study. The study was carried out on the data of schoolchildren from “The VKontakte” social network, corresponding to the ninth and eleventh grades, which were divided into four groups. The analysis of unique community subscriptions revealed significant differences in the age groups of schoolchildren. Then, based on gradient boosting, the algorithm that allows restoring missing information in the digital trace of schoolchildren was built. The optimization of the parameters of this algorithm based on numerical experiments allowed obtaining the precision of the order 0.6. The algorithm was used to identify groups of schoolchildren in 9th and 11th grades, in the digital trace of which there was incomplete information. The practical significance of the project is to expand the target audience of future university applicants and, as a result, the opportunity for the university to help them using career guidance measures in social networks to choose an educational program more consciously.
Optical incoherent direction finder as a part of a fault-tolerant complex for landing onto small bodies of the Solar System
Authors: Lobanov A A , Alpatov A N , Mozharov G A , Torshina I P , Troitsky V I 
Published: August 2020

Abstract
The subject of the study is the on-board guidance and navigation system for an autonomous landing of a space probe. The list of on-board equipment for safe landing of the spacecraft on the small bodies of the solar system (SBSS) is offered. The algorithm is proposed to combine all the on-board equipment into a single fault tolerance system. All the equipment is selected under the condition of the ability to identify failures at an early stage. The novelty of the method is in diversifying methods that are used in each stage of failure analysis. Such general method allows rejecting the results of some failure measurements from the further process thus preventing possible accident. The algorithm suggests two-stage control of the on-board systems that allows improving the fault tolerance. The first stage is based on the method of analysis of a number of double unequal measurements, but unlike the classical approach, it is assumed not to improve accuracy, but to search for errors. The second stage is based on the analysis of the parameters to control the internal equipment in order to predict failures.
Design of Border Security Defense System for VPN Network in Power Enterprises
Authors: WenZhen Ma , MingChang Xu 
Published: August 2020

Abstract
In order to ensure the safe and stable operation of the power system, the VPN network border security defense system of power enterprises is designed. The hardware of the system is planned and designed, including cooperative intrusion detection, security audit, cooperative camouflage, collaborative firewall, disaster recovery and electronic forensics. On the basis of the hardware design, the network data in the gateway is detected by using the cooperative control framework and other security technologies, and the attack behavior is analyzed by using host based intrusion detection, and the network information security situation assessment based on si-s0 is proposed. The algorithm estimates the security state of network intrusion information and realizes the security defense of network boundary. The experimental results show that the designed VPN border security defense system has higher security than the traditional system, and fully meets the research requirements.
Application of intelligent control in industrial process control automation
Authors: Hong Wang , YanYing Li 
Published: August 2020

Abstract
Based on the development background of industrial 4, the development status of industrial process control automation is analyzed, and the application of intelligent control is discussed. First, combined with the forefront of industrial process automation development, the current hot point intelligent control technology and means are summarized. Secondly, the specific application of intelligent control is discussed. Finally, the application development suggestions of intelligent control are put forward. The application of intelligent control has played an important driving role. Combined with the specific application and research, we summarized the application of intelligent control and shared it with the relevant personnel for reference.
From the point of view of the research on and application of industrial process control automation, the key is to realize intelligent production, the key is to realize the intellectualization of manufacturing process, and then to achieve the goal of high efficiency and green development, and to build an industrial manufacturing mode that can realize intelligent decision making and intelligent independent control of manufacturing equipment. It is necessary to optimize the control of industrial process, that is to optimize and control the intelligence and integration, realize efficient perception of production conditions change, adaptive decision-making, and track the setting value of control system to achieve the optimal target of operation index, that is, to improve the quality and efficiency of production, to reduce energy consumption and to promote the continuous development of industry. The following analysis is carried out.
Research on Network Information Security Issues and Strategies under the Internet Plus Environment
Authors: Li E 
Published: August 2020

Abstract
In today’s world, with the rapid development of science and information technology, the internet has become an indispensable medium in people’s daily life. Through the internet, we can carry out various activities very conveniently and save a lot of manpower and material resources. In recent years, internet plus has become a hot word. It aims to deeply integrate the internet with traditional industries and create new development ecology with the help of internet platform and network information technology. With the deepening of network information technology, network information security has become an increasingly prominent problem. This paper analyzes the network information security problems under the internet plus environment, and puts forward corresponding countermeasures to reduce the emergence of various network information security problems in order to maintain people’s information security.
Research on Fault Transmission Method of Switchgear Based on Internet of Things
Authors: Chen Jianxin , Yu Shujiang , Jiang Yijun , Wang Genming 
Published: August 2020

Abstract
In order to meet the intelligent function of the switchgear, the fault transmission method of the switchgear based on the Internet of Things is researched and designed. Firstly, use the data collection terminal and monitor to monitor the parameters in the switchgear and transmit the detected faults; Secondly, use the Internet of Things method to design a monitoring switch platform to provide an operating environment for fault monitoring; Finally, verify the accuracy of the IOT(internet of things) technology in the fault transmission of switchgear.
Research on comprehensive index of freezing disaster caused by rain and snow
Authors: Chang Zhenxing , Wei Zhen , Chen Tao , Wang Guanning , Ma Na , Zheng Huijie 
Published: August 2020

Abstract
In this study, the ISD surface meteorological observation data set in NCEI database website under NOAA is used. The longitude and latitude range of the selected stations is 105°E∼117.5°E, 24°N∼32.5°N. The basic meteorological data of the winter from 2001 to 2010 are statistically analyzed. The statistical analysis shows that there is a short period of severe cooling to below 0°C and relative humidity increasing in 2008, in addition, the observed wind speed did not change significantly, the wind direction changed disorderly, and the sea level pressure at different stations showed high consistency. Based on the statistical analysis, three basic meteorological elements, temperature, relative humidity and wind speed, are selected to normalize, and then the rain snow freezing disaster index is generated according to the weight. According to the unified standard, Guizhou Province is (0.65,0.3,0.05), Hunan and Jiangxi Province is (0.55,0.4,0.05). Through the qualitative evaluation of the weight factor scheme, it can reasonably reflect the situation of rain and snow freezing disaster.