bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the strength of granules of instant drinks in a drum vibrating unit
Authors: Popov A M , Plotnikov K B , Ivanov P P , Donya D V , Plotnikov I B , Beryazeva L N 
Published: February 2021

Abstract
In conditions of high employment, the question of proper and balanced nutrition is becoming more and more acute, since it is not always possible to get all the substances necessary for the body with food. In this regard, the development of functional instantiated products is an urgent task. The paper investigates the new design of a drum vibrating unit, namely, determining the strength of the obtained granules depending on the design and operating parameters of the process. The object of research was instantiated jelly in the form of granules with dimensions of 1–3 mm. Another task was to determine the effect of mechanical activation of potato starch on the strength of the resulting granules. From the analysis of the obtained data, it can be concluded that the greatest influence on the strength of the granules is exerted by the dynamic component, namely, the frequency and amplitude of vibrations, and the rotation frequency of the kneading unit does not have a significant impact, but directly affects the time when the product is in the drum unit. Analysis of the effects of mechanical activation of potato starch showed that granules obtained based on native potato starch have less static crushing strength. This is because during the mechanical activation of starch agglomeration centres are formed, which ultimately leads to an increase in strength.
Ways to improve the efficiency of regulation of biomass concentration using modern control systems
Authors: Avtsinov I A , Gavrilov A N , Sukhanova N V , Kozhevnikov Yu E , Nickel S A , YuMalikov D 
Published: February 2021

Abstract
The paper presents an option for solving the task of controlling the process of growing yeast in order to bring their concentration X closer to the desired one by deliberately changing the parameters of the process conditions within acceptable limits. The relationships between the main parameters of the process of cultivation of microorganisms are revealed. It is shown that these relationships are of a complex cross character, and the control object is multidimensional. Based on the analysis of the interaction of the main parameters, a diagram of their relationship is drawn up. At optimal values of the parameters of the process conditions, the change in yeast concentration is far from the required. It is proposed to change the parameters of the process conditions in accordance with a given value of the concentration of yeast Xgiv, which can be determined with constant periodicity during the cultivation process. To solve assigned task, the principle of cascade control of yeast concentration X is used, where the internal contour includes the systems of controlling the temperature, acidity, formal value, and respiratory coefficient. The analysis of transients in cascade systems showed that the most effective systemsunder consideration are concentration control systems that use the temperature and the acidity of the medium control in the internal circuits.
Increase of durability of cutting elements in forage equipment using electric spark alloying
Authors: Akenchenko M A , Davydov O Yu , Kvashnin B N , Litvinov E V , Lihacheva L B 
Published: February 2021

Abstract
Features of interaction between the contact surfaces of cutting elements and ground raw materials used for forage preparation determine ways to increase the wear resistance of these elements, which are based on the formation of layers on their working surfaces with physical and mechanical properties and relief corresponding to these features. Because the conditions in the contact zone are variable, selective local application of electrophysical reinforcing coatings can ensure equal strength of different working surfaces or create conditions for self-sharpening of cutting edges and thereby increase their wear resistance. Electric spark alloying is a micro-welding process that uses short-term electrical pulses of high current to deposit the electrode material on a underlay of any electrically conductive metal material. The method of electric spark alloying is based on the phenomenon of metals and alloys erosion under the influence of electric current. The main disadvantage of electric spark alloying is the high roughness of the hardened surface after processing. Received wear-resistant layer should maintain as much thickness as possible and avoid further mechanical treatment of the surface that increase the durability of the restored part and reduce the total cost of work on reinforcement.
Study of energy consumption when mixing bulk materials in a centrifugal-blade mixer
Authors: Ratnikov S A , Borodulin D M , Sukhorukov D V , Cherkashina D K 
Published: February 2021

Abstract
The results of a study of the flowability of finely divided dry materials and mixtures depending on the diameter of the particles and their density are presented, the influence of the mechanical effect and the physicomechanical properties of the materials on the flowability are determined. A mathematical model is constructed that allows one to functionally evaluate the dependence of flowability on the physicomechanical characteristics of the material under study by the method of multiple regression analysis. Polynomial equations are obtained that describe the influence of the flow area, physical and mechanical properties on the flowability of various materials and mixtures. A flowability criterion is proposed that describes the motion of various materials under the action of inertia forces. Partial and universal criteria equations are obtained that describe the energy expenditures for mixing bulk materials
Fe3O4@PDA Immobilized glycerine dehydrogenase
Authors: Xing Zhaoliang , Dai Xiying , Wu Pengfei , Zhang Chong , Li Fei , Xiao Yu , Li Jian , Han Lin 
Published: February 2021

Abstract
Synthesis of surface modified/magnetic nanoparticles has become a vital research area of material science. In the present work, iron oxide (Fe3O4) nanoparticles prepared by solvo-thermal method were functionalized by polydopamine, which was as a facile nanoplatform for immobilizing glycerine dehydrogenase (GDH). The obtained nanocatalyst enabled efficient glycerol dehydrogenation reaction. The results show that GDH immobilized on polydopamine coated iron oxide (Fe3O4@PDA@GDH) revealed better adoptability towards higher levels of pH comparative. Moreover, this biocatalyst can be easily recovered from the reaction system without centrifugation or filtration.
Analysis of Smart Grid Stability and Security Management Based on Data Mining
Authors: Zhang Chao , Yuan Zhihang , Yan Pei 
Published: February 2021

Abstract
In the process of the operation and construction of the smart grid, the development of science and technology and the improvement of social productive forces have put forward higher requirements for the development of the power system. In this process, the scale and form of the power system have also changed to a certain extent, and power security has also become the most concerned issue. In the information society, through the application of the Internet of things and big data technology in power security management and control. It can simplify the operation process of the staff and reduce the occurrence of accidents. Distributed smart grid is a new technology proposed for power networks with elastic nodes, which can realize dynamic electricity price demand response without large-scale transformation of infrastructure. In order to analyze the system stability of DSG, six representative machine learning classification models are applied to analyze the stability data of 10000 samples of 4-node system. Combined with the requirements of power system security, stability and economy, the effect of each classification model on the prediction of DSG system stability is tested.
Active Distribution Network Fault Recovery Based on Particle Swarm Optimization
Authors: Jiao Deqiang , Wan Lin , Wang Dinghao 
Published: February 2021

Abstract
As a new mode of distribution network, it is necessary to study the minimum loss of active distribution network after line failure. Therefore, this paper proposes a method of active distribution network fault recovery based on particle swarm optimization (PSO). On the premise of satisfying the constraints of distribution network, this algorithm establishes an objective function model of balancing load based on reducing network loss. Using the active distribution network system of IEEE 33 node, the experimental simulation proves that the particle group algorithm can effectively solve the problem of active distribution network fault reconstruction by contrasting the particle group and ant group algorithm, and has the advantages of good stability and high efficiency.
Design of high-rise garbage sorting and conveying system based on gravity power generation system
Authors: Wang Shuai , Yang Zi’yu 
Published: February 2021

Abstract
With the rapid development of society and the improvement of people’s living standards, more and more people live in high-rise buildings, and while their living conditions are improving, they are also facing a lot of cleaning problems of domestic garbage. Among them, the disposal of domestic waste is one of the biggest problems faced by high-level users in their home lives. At present, the existing facilities are to build vertical garbage channels and set up garbage bins on each floor, but its convenience is far lower than the negative impact brought about, so a new type of garbage conveying system is necessary.
Harmonic analysis of AC/DC hybrid microgrid
Authors: Jiao Deqiang , Liu Che , Wang Dinghao , Li Zerui 
Published: February 2021

Abstract
A large number of nonlinear components exist in AC/DC hybrid microgrid, which will cause harmonic pollution and affect power quality. In this paper, according to the diversity, complexity, nonlinear and mutation characteristics of harmonics, the harmonic analysis of AC/DC hybrid microgrid is carried out by adding harmonic sources. The model diagram of AC/DC hybrid microgrid is built, and the mathematical parameters of harmonics are introduced. Finally, the simulation of microgrid model is constructed based on ETAP, and the harmonic characteristics of AC/DC hybrid microgrid are studied in three cases of static load and equivalent grid using the same harmonic source.
Design and Research of Plug-in Strip for Field Verification of Electric Energy Meter
Authors: Yin Wei , Tang Shengfei , Zhu Weijie , Chen Jin , Xie Jianguo , Sun Guodong , Xu Qin 
Published: February 2021

Abstract
Design a special plug-in strip for on-site verification of electric energy meters, combined with a dedicated wiring backplane for non-stop meter replacement, to achieve non-stop meter replacement. On the basis of meeting the on-site verification work, design the special plug-in strip for verification, complete the selection of the materials of the special plug-in strip for verification, upgrade and improve the special plug strip for on-site verification of electric energy meters according to the requirements of safety, functionality, and durability. And open the mold trial production verification special plug-in sample. The special plug-in strip design for on-site verification of electric energy meters lays the foundation for realizing the replacement of electric meters without inductive power failure.
Evaluation of the effect of various types of tools on a weld joint during wave strain hardening
Authors: Kirichek A V , Barinov S V , Yashin A V , Ryzhkova M N , Konstantinov A M , Zaitsev A A 
Published: February 2021

Abstract
The article studies the problem of increasing the durability of weld joints using surface plastic deformation by the method of wave strain hardening (WSH). Earlier, WSH was not used for these purposes. The prospect of using WSH for increasing the durability of weld joints is associated with the possibility of increasing the microhardness and the formation of compressive residual stresses at a depth of more than 10 mm. To identify the most effective conditions for the use of various types of tools for WSH of weld joints and accelerate the search for rational modes and conditions of WSH, finite element modeling was used. As a result of the research, recommendations related to the use of various types of WSH tools, depending on the thickness of weld joints, changes in hardness and stress state of the near-weld zone after welding, were given.
Prospects for power supply infrastructure enhancement
Authors: Gavrikova E V , Gorgisheli M V , Kosygina A V , Volkova I O , Yakovleva A Y , Dolmatov I A , Suslov K V 
Published: February 2021

Abstract
Traditional retail electricity market models transform under the condition of new technologies development and institutional changes in countries and worldwide. New models of the retail electricity market need to be adopted to recent requirements made by different stakeholders. The purpose of this study is to advance the understanding of transformation of the electricity retail market in different countries through introducing a uniform framework for comparison. The findings provide insights for experts and authorities on how the changes in the dynamic environment led to the emergence of new market models in six surveyed countries. Specific features of different models are highlighted to ensure optimal working conditions and incorporation with managerial practices in the industry as well as to help policy makers to understand what additional measures may boost the competition in retail electricity markets.
Interaction algorithm of the mechanisms of relative manipulation in a 6-DOF robot control system
Authors: Khalapyan S Y , Rybak L A , Gaponenko E V , Kholoshevskaya L R 
Published: February 2021

Abstract
The paper considers the features of management of a 6-DOF robot, developed on the basis of two interacting mechanisms of a parallel structure. Each mechanism provides movement in three independent degrees of freedom: a flat 3-RPR mechanism for installing a part and a 3-RPS mechanism (tripod) for installing a tool. It is shown that when these mechanisms are jointly controlled, it becomes necessary to correct the movement of one of them in connection with the parasitic movements of the other. The authors propose the method for the description of the position of the movable platform of the tripod, which allows using only five output coordinates. According to the authors, the platform rotation representation used in this case is more convenient to describe the interaction of mechanisms than the traditional use of Tait – Bryan angles. The algorithm was developed to correct the task by the position of the planar mechanism in order to compensate parasitic movements of the movable platform of the tripod in the horizontal plane during the control of a 6-DOF robot. On the basis of a specially constructed 6-DOF robot model with mechanisms of relative manipulation, the simulation in the MATLAB package was carried out, which confirmed the effectiveness of the proposed algorithm.
Standardization and control of thread parameters of a roller-screw gear
Authors: Zavyalov V S , Fedosovsky M E , Maltseva N K , Degtyarev V V , Boldyrev I P , Sharshov A G 
Published: February 2021

Abstract
Among the mechanisms that transform rotational motion into translational motion, helical gears of rolling, which provide higher efficiency and speed, are currently dominant. These include ball-screw gears and roller-screw gears. A comparative analysis of these showed that the latter has a number of limitations compared to the former. Serial production requires the development of automated technologies for machining, assembly and testing, the use of high-precision metrological equipment to control functional surfaces with minimal time costs in digital automated systems. Modern measuring instruments, such as contour meters allow for element-by-element control of the parameters of threaded surfaces. In the manufacture of high-tech products such as an electromechanical drive, the use of element-wise control is the only way to ensure product quality. However, not enough standardization of the parameters of the thread of the roller-screw gears requires the development of a set of requirements that provide the specified operational characteristics of the product. The work is devoted to the standardization of the parameters of the special roller-screw gears thread used in the electromechanical drive manufactured by AO Diakont. This article discusses issues related to the standardization of the accuracy parameters of the profiles of high-precision roller-screw gears, metrological support tools, a set of techniques and software based on a systematic approach to inputting, outputting and transmitting information about measurement results and evaluating their validity. The application of the proposed control methodology allowed improving the quality of products and reducing its cost.
Recognition of structural elements of mechanical engineering as a solution to data formalization problem
Authors: Fokin I V , Podrez N V , Smirnov A N , Govorkov A S 
Published: February 2021

Abstract
The paper discusses a typical example of recognizing a sheet metal part containing 2 structural elements. According to the developed recognition algorithm, a software module was implemented for automated recognition of structural elements in a 3-dimensional model of parts with the * .stp extension, which allowed working not only with models made in the Siemens NX system, but also, in general, with almost any 3D models exported in this format. The result of recognition can be used to develop systems that design technological processes for the production of mechanical engineering products, including at aircraft production enterprises.
Geological, technological and technical justification for choosing a design solution for drilling wells under different geological conditions
Authors: Mukhametshin V G , Dubinskiy G S , Andreev V E , Mukhametshin V V , Kuleshova L S 
Published: February 2021

Abstract
The oil companies focus on the prevention of leakage of the producing well to ensure the long-term well viability. The article considers the rationale for preventive measures to reduce the risks to the integrity of the strings and ensure the operation of the wells for the duration of their use. The authors propose tools for analysing the condition of wells as well as technical and technological solutions for extending the operation of the well without damage.
Modeling the production of hard-to-recover oil reserves using thermal methods
Authors: Gizzatullina A A , Minnivaleev T N , Mingulov I Sh 
Published: February 2021

Abstract
This article presents the theoretical and numerical implementation of the possibility of heating a reservoir with hard-to-recover oil. In a radial one-dimensional formulation, the article proposes a solution to the problem of hard-to-recover oil filtration with an increased viscosity coefficient. The procedure is performed in a reservoir using the thermal method of exposure in a single horizontal channel. Hot steam or water flows are used as a heat carrier. Only one channel is used as a heated and production well, which operates alternately.
Using the method of canonical discriminant functions for a qualitative assessment of the response degree of producing wells to water injection during the development of carbonate deposits
Authors: Mukhametshin V V , Kuleshova L S 
Published: February 2021

Abstract
The article proposes an algorithm for qualitative assessment of the response degree of producing wells to water injection into wells for the conditions of oil deposits of the Tournaisian stage of the Volga-Ural oil and gas province, based on the use of the method of canonical discriminant functions (CDF). The obtained CDF equations and distributions make it possible to quickly solve the issues of assessing success of a particular waterflooding system, select wells for transferring them to injection, evaluate the density of the grid of production and injection wells, pressure and volumes of water injection at the stage of drawing up the first design documents.
Mathematical model of propagation of liquid vibrations in a tubing string
Authors: Zaripova L M 
Published: February 2021

Abstract
Effectiveness of wave processes in tubing strings, wells and long pipelines may be limited by damping of hydrodynamic waves along the length of the channel. Violation of thermodynamic equilibrium in reservoir fluids during their rise to the surface and in ground pipelines may be accompanied by the release of asphalt-resin-paraffin components in the flow of crystals due to a decrease in temperature and pressure. Subsequent depositing of crystals takes place as they grow, due to adhesion to the wall of pipes, the surface of equipment. Deposits are most intensified in areas of local expansion and narrowing of the cross-section area of the flow (occurrence of vortices).
Electrospun nanofibrous scaffolds of ε-polycaprolactone containing graphene oxide and encapsulated with magnetite nanoparticles for wound healing utilizations
Authors: Al-Ahmed Zehbah Ali , Al Jahdaly Badreah A , Radwan Hyam A , Hassana Abeer A , Almahri Albandary , Ahmed M K , Taher Mohamed M 
Published: February 2021

Abstract
Wound healing treatment with a nanofibrous matrix is a serious demand to avoid associated complications, including bacterial infections. Magnetite nanoparticles (MNPs) were encapsulated into electrospun nanofibrous scaffolds of ε-polycaprolactone (PCL) containing graphene oxide (GO) nanosheets. The structural and morphological behaviors of the obtained scaffolds were investigated. The modification of nanofibers via the addition of MNPs generated a slight change of morphology, whereas the fibers’ diameters were around 0.2–0.5, 0.1–0.3, 0.1–0.2, and 0.1–0.3 μm for 0.0NPs-GO@PCL, 0.1NPs-GO@PCL, 0.2NPs-GO@PCL, and 0.3NPs-GO@PCL, respectively. Moreover, the roughness average (Ra) increased from 119 nm to be about 169 nm from the lowest and the highest contributions of MNPs. The Human fibroblasts cell line (HFB4) reached around 98.4 ± 3.1% cell viability for 0.2MNPs-GO@PCL composition. The antibacterial activity of the highest contribution of MNPs reached about 11.4 ± 1.6 mm and 12.3 ± 1.2 mm against S. aureus and E. coli, respectively. The in-vitro cells’ attachment of HFB4 showed that cells were adhered to and proliferated through the nanofibrous scaffolds. Cells also spread and grew significantly as the modification via MNPs. Thus, indicating that designing of new scaffold for wound healing and disinfection utilization could be reached via tailoring of electrospun products encapsulating with biocompatible substances such as graphene oxide and magnetite.
InGaAsPBi grown on InP substrate by gas source molecular beam epitaxy
Authors: Tian Fangkun , Ai Likun , Xu Anhuai , Huang Hua , Qi Ming 
Published: February 2021

Abstract
The effects of growth condition on material quality of quinary alloy InGaAsPBi grown by gas source molecular beam epitaxy (GSMBE) were investigated systematically. It is found that 0.1% of Bi incorporation can play the role of surfactant effects and is beneficial to improve the material quality. The roughness of surface RMS measured by atomic force microscope (AFM) is 0.218 nm. Furthermore, the addition of a small amount of bismuth atoms promotes the binding of phosphorus atoms to group III atmos.