bluuebunny/crossref_metadata_2025_split huggingface dataset:
Monitoring hardeners of low toxic urea-formaldehyde resins
Authors: Kantieva E V , Ponomarenko L V , Starodubov A S 
Published: November 2020

Abstract
According to European standards, the most stringent standards for the content of formaldehyde belong to the emission class E 0.5. The hardening of resins with different formaldehyde content is different and it has not yet been sufficiently studied. The production of the woodworking industry face difficulty in the use of low toxic urea-formaldehyde resins. On the one hand, life and standards require environmentally friendly products, on the other hand, the use of low-toxic resins leads to a large percentage of defects in the production process, reduced productivity and deterioration of the strength properties of the finished product. The polycondensation reaction of low-toxic resins using a classical hardener-ammonium chloride is slower in comparison with resins with a high content of formaldehyde, that is, performance is reduced. The paper examines the influence of various hardeners on the physical and chemical properties of the glue (gelatinization time, viability, pH of liquid and cured adhesives). All the studied preparations can be used as a hardener of low-toxic urea-formaldehyde resin, but its content should be adjusted taking into account the physical and chemical parameters of the initial state of the resins and production conditions.
Development of a system for control of synthesis of methyl tertiary butyl ether
Authors: Muravyova E A 
Published: November 2020

Abstract
Methyl tertiary butyl ether is an oxygen-containing octane-increasing component used to increase the octane number of gasoline. The use of MTBE is very important in the modern world, since it improves not only the parameters of detonation resistance, but also reduces the content of carbon monoxide and hydrocarbons in the exhaust gases, which positively affects the environment. The article describes the technology of the synthesis of methyl tertiary butyl ether, gives a functional diagram of the process, the parameters involved in the production process, their control limits, which correspond to the manufacturer’s regulations, a mnemonic diagram, the dependence of the parameters on each other in the form of formulas, in addition, the process of creating a control program and developing a process control system is shown. The main objectives of the development of a methyl tertiary butyl ether synthesis process control system are the control and regulation of process parameters, as well as the search for the optimal use of resources and materials to increase the yield of finished products. The SCADA system was developed based on the actual limits of parameter control during the technological process. The expediency of using a SCADA-system is substantiated.
Tacking with curvilinear knives for grinding fibrous plant polymers
Authors: Marchenko R A , Shurkina V I , Yarovoy S V 
Published: November 2020

Abstract
The method for calculating the main technological parameters of a set with a curved shape of knives is presented. The aim of the work is to design a disk set with circumferential knives and to determine dependencies that allow predicting the technical and technological parameters of this set, the quality of the resulting semi-finished product during grinding, increasing the productivity of the grinding plant and reducing energy consumption during grinding. For the first time, a numerical method has been developed for calculating the second cutting length (Ls) of a knife set with a curved shape of knives, taking into account the main geometric parameters of the set. The geometric construction of the knife set of grinding machines allows to purposefully predict its use for various modes of the grinding process in the production of certain types of finished products. The research results can be used in the design of new types of headsets, their manufacture and operation.
Algorithm of ecological solutions in the smart city concept
Authors: Sergeev S M , Starodubtsev Y I , Kravets O Ja , Jawasreh H M 
Published: November 2020

Abstract
Solving the ecological problems of big cities is made difficult by the fact that their activities are built on the concentration of many kinds of resources. The economic foundation for their prosperity is made up of scientific, manufacturing, and cultural opportunities. At the same time, negative externalities occur, and natural and technological restrictions come into effect. The lessons of the COVID-19 pandemic require seeking out new methods of managing metropolitan areas. Global cities are unique in their constant influx of people - tourists, expats, students, and so on. This paper presents a way to solve the problems relating to regulating the inflow of visitors. A dynamic model of the spread of the infection is put together, the arguments for which are the restrictive and quarantine measures. At the same time, the problem of finding an economically sound balance between ecological externalities and the capacity of limited resources is solved. When solving these two problems using computer simulation, it becomes possible to use information flows of smart city systems, while the results of the calculations provide the basis for adopting the optimal set of administrative and technical solutions.
The use of 3 dB multi loop directional coupler with reduced dimensions in Marine communication systems
Authors: Hung L Q , Nhung D T 
Published: November 2020

Abstract
This article describes the process of developing a model of a multi loop directional coupler for marine applications by replacing conventional segments with artificial transmission lines. As a result, a coupler with an area of 2455 mm2 (at a frequency of 0.9 GHz) was obtained, which is 75.15% less than when the coupler is implemented on quarter-wave segments. The relevance of this work lies in the development of compact devices with easily reproducible geometry through the use of artificial transmission lines.
Effect of cavitational conditioning of water on stability of coal-water slurry
Authors: Stebeleva O P , Kashkina L V , Rubleva T V , Dobrosmyslov S S , Vshivkova O A 
Published: November 2020

Abstract
Coal-water slurry (CWS) is the basis of modern alternative fuel - coal-water fuel (CWF). To produce stable coal-water slurry, i.e. coagulation and separation is an important technological problem. The paper studies CWS the disperse part of which is fine brown Kansk-Achinsk coal, the dispersive part is distilled water. Effect of cavitational conditioning on CWS stability has been studied. The efficiency was for the first time studied by magnetic resonance tomography (MRT). In the experiment spin-lattice relaxation time profiles T1 were recorded along the central vertical axis of the samples. T1 dynamics correlates well with the local density of CWS solid phase. MRT data was sequentially interpreted with rheological characteristics of CWS. Feasibility of applying MRT method to find out time and space evolution of CWS has been estimated. The MRT methods has been shown to be efficient in resolution of technological problems to improve consumer properties of the coal-water fuel.
Optimization of costs for production and transportation of heat carrier in the district heating system
Authors: Vologdin S V , Korepanov A V 
Published: November 2020

Abstract
The article presents a problem statement and an algorithm for optimizing the parameters of the heat network and the power of heat sources (boilers, thermal power plants). Solving the optimization problem allows you to minimize the cost of production and transportation of the heat carrier, determine the optimal operating modes of pumping stations, as well as the performance of heat sources for a multi- circuit heat network. The proposed algorithm also includes calculation of the cost of heat energy production from various heat sources. The results of calculations of test problems on various model schemes of heat supply with an arbitrary number of consumers, heat sources, and pressure regulators are presented. Optimal regulation allowed to reduce total costs in the test calculation to 10%. The proposed method for solving the extremal problem showed good convergence of the iterative process. When calculating networks without pressure regulators, the method quickly converges. In the presence of pressure regulators, the convergence of the iterative process worsens, since the target function is nonlinear in this case. The research results can be recommended for making management decisions to improve the quality of functioning of district heating systems.
Combined acoustic-convective drying of plant products
Authors: Khmelev V N , Shalunov A V , Nesterov V A , Terentyev S A , Tertishnikov P P , Bochenkov A S 
Published: November 2020

Abstract
The paper presents the design of drying plants that combine convective drying with ultrasonic exposure. To create ultrasonic vibrations, ultrasonic emitters in the form of bending-vibrating discs with a diameter of 205 mm and 104 mm were used. Peas and vegetables were the objects of drying. As a result of the experiments, it was found. Drying with the help of ultrasonic action together with the thermal one proceeds no less than in 45% faster in comparison with the drying without ultrasonic action. During the drying of peas using the acoustic field, the drying time was reduced by 210 minutes (45%). The use of powerful ultrasonic action in a non-contact mode on dried carrot samples made it possible to reduce the drying time by 300 minutes, which is 47%. The acoustic method of drying allowed to reduce the drying time of potatoes by 300 minutes (45%).
Influence of measurement error for the results of defection of parts hole-type
Authors: Leonov O A , Shkaruba N Zh 
Published: November 2020

Abstract
Technological processes of repair production for a number of objective and subjective reasons do not provide the required reliability of equipment after repair. It has been shown that the most important process for incoming inspection of worn parts is fault detection. It is shown that the control process during flaw detection occurs not at the edges of the scattering zone, as it happens in mechanical engineering, but in the center. Features of formation of control errors of the 1st and 2nd kind during flaw detection of hole-type parts in repair production are considered. A new approach is proposed to assess the influence of measuring instrument error on the results of flaw detection of hole-type parts. this approach consists in developing a calculation method and plotting the dependences of calibration parameters for flaw detection of parts. Based on the proposed approach, the distribution of sorting parameters for hole-type parts by groups during defect detection is determined. The results were analyzed.
Assessment of the level of environmental innovation in industrial production and information and communication sphere
Authors: Gibadullin A A , Romanova Ju A , Morkovkin D E , Pirakov R M 
Published: November 2020

Abstract
The article analyzes environmental innovations in industrial production and information and communication activities. Because of the analysis of the indicators, it was revealed that technological innovations in all considered areas of activity do not exceed 10%, and environmental innovations in industrial production reach 16%, in the information and communication sphere, they do not exceed 3-4%. The study found that such a situation indicates that not all enterprises have adopted a sustainable development policy and ensure the preservation of the environment for future generations. The analyzed indicators for the control of environmental pollution by various enterprises that use the tools of the information and communication sector in this matter are carried out only on a part of enterprises. At the end of the study, measures were proposed to enhance innovation in the field of ecology in all spheres of activity and industries.
The enhanced plate heat exchanger for systems of housing and communal services
Authors: Savvin N Yu , Kushchev L A , Feoktistov A Yu , Roshchubkin P V 
Published: November 2020

Abstract
The problem of intensification of thermal processes and the process of heat exchange in a plate heat exchanger of the HHN02 type is considered. A comparison is made of two types of heat exchangers - shell-and-tube and plate. The formulas for calculating heat transfer and heat transfer coefficients are presented. The analysis of theoretical studies on the intensification of heat transfer in a plate heat exchanger with a corrugated surface of the plates is carried out. A full-scale experiment was carried out on a specially designed semi-industrial stand “Independent heating system of a residential building”. It has been found that the use of a corrugated surface is capable of providing a high value of the heat transfer coefficient. It has thus confirmed the advantages of the plate heat exchanger in comparison with the shell-and-tube.
Intensification of heat removal in diabatic columns
Authors: Voinov N A , Deryagina N V , Zemtsov D A , Bogatkova A V , Zhukova O P 
Published: November 2020

Abstract
Diabatic units having heat exchanger tubes functioning as dephlegmators on trays, which allow to reduce the cost of the process, are considered. It is shown that the most efficient approach is to arrange heat removal with the film flow of the heat carrier in the diabatic column dephlegmator. Heat transfer intensification in a gravitationally flowing film, as well as to in an upward and downward parallel flow during the heating and boiling of the heat carrier was analyzed. Dependences for determining the value of the heat transfer factor are presented.
Problems with boundary conditions for one component solution in the ODE system
Authors: Dzhabrailov A L , Israilov S V 
Published: November 2020

Abstract
The article investigates a new type of boundary value problems with boundary conditions for only one component of the solution of a system of ordinary differential equations that cannot be investigated for the existence and uniqueness of a solution by traditional methods. In this work, to study this type of non-standard problems with boundary conditions, the method of linear mappings was used. The use of this method for this kind of non-standard problems is justified in the monograph of one of the authors of this article. Three theorems are proved: two on the existence of a solution and one on the uniqueness of a solution. The proof of these theorems follows from M.A. Krasnoselsky’s principle. since the right-hand sides of the system consist of the sum of two operators, the first of them is a contraction operator, and the second is a completely continuous operator.
Low gain antenna beam forming using metamaterial
Authors: Romanov A G , Testoyedov N A , Tutyarov N A , Sedelnikov Yu E 
Published: November 2020

Abstract
The work considers the possibility of using metamaterials to design of low-gain antennas with improved parameters of antenna pattern. It is shown that additional elements of the antenna, made of metamaterial, can be considered as antenna array of parasitic emitters, forming antenna pattern of the required shape. It is shown that the use of metamaterial inserts allows to optimize irradiators for reflector and lens antennas.
Investigation of the possibilities of increasing the resolution of lidars in the infrared wavelength range for monitoring methane in the atmosphere
Authors: Grigorievsky V , Sadovnikov V , Elbakidze A , Tezadov Ya 
Published: November 2020

Abstract
The paper deals with the resolution of an optical lidar for measuring the background concentration of methane in the atmosphere both on surface horizontal paths with reflection of an optical signal from natural objects and on vertical paths, when an optical signal is reflected from cloud layers with extrapolation to low space orbits. It was shown using simulations that in the case of measurements from a low space orbit, the signal accumulation time can be reduced to 1 second or less due to the large signal attenuation at the center of the absorption line in the atmospheric air column. For a signal accumulation time of 1 s, the horizontal resolution along the horizontal coordinate will be ∼8 km at a satellite orbital velocity of ∼8 km / s. The vertical resolution for measurements from space orbit can be ∼ 1 km if the accuracy of measuring the absorption line broadening is ∼0.006 nm (10%). On the horizontal paths, the experimental results are in good agreement with the simulation results. Broadening the emission line of the lidar transmitter by a factor of ∼3 makes it possible to increase the radiated power at the considered wavelength ∼ 1653 nm, improve the energy potential of the device, and bring the horizontal resolution to 5-10 meters on the speed of lidar beam, corresponding to the speed of the helicopter.
Substrate-dependent control of the chiral orientation of mesenchymal stem cells: image-based quantitative profiling
Authors: Das Ankita , Adhikary Shreya , Chowdhury Amit Roy , Barui Ananya 
Published: November 2020

Abstract
Stem-cell (SC) chirality or left-right (LR) asymmetry is an essential attribute, observed during tissue regeneration. The ability to control the LR orientation of cells by biophysical manipulation is a promising approach for recapitulating their inherent function. Despite remarkable progress in tissue engineering, the development of LR chirality in SCs has been largely unexplored. Here, we demonstrate the role of substrate stiffness on the LR asymmetry of cultured mesenchymal stem cells (MSCs). We found that MSCs acquired higher asymmetricity when cultured on stiffer PCL/collagen matrices. To confirm cellular asymmetry, different parameters such as the aspect ratio, orientation angle and intensity of polarized proteins (Par) were investigated. The results showed a significant (p < 0.01) difference in the average orientation angle, the cellular aspect ratio, and the expression of actin and Par proteins in MSCs cultured on matrices with different stiffnesses. Furthermore, a Gaussian support-vector machine was applied to classify cells cultured on both (2% and 10% PCL/Collagen) matrices, with a resulting accuracy of 96.2%. To the best of our knowledge, this study is the first that interrelates and quantifies MSC asymmetricity with matrix properties using a simple 2D model.
Tripartite genuinely entangled states from entanglement-breaking subspaces
Authors: Sun Yize , Chen Lin , Zhao Li-Jun 
Published: November 2020

Abstract
The determination of genuine entanglement is a central problem in quantum information processing. We investigate the tripartite state as the tensor product of two bipartite entangled states by merging two systems. We show that the tripartite state is a genuinely entangled (GE) state when the range of both bipartite states are entanglement-breaking (EB) subspaces. We further investigate the tripartite state when one of the two bipartite states has rank two. Our results provide the latest progress on a conjecture proposed in the paper [Yi Shen et al 2020 J. Phys. A
53 125302]. We apply our results to construct multipartite states whose bipartite reduced density operators have additive entanglement of formation (EOF). Further, such states are distillable across every bipartition under local operations and classical communications.
Synthesis of a New Type of CMK-3-Pt with the In-situ Growth Method and Its Characterization
Authors: Yang Hongyi 
Published: November 2020

Abstract
With the growing consumption of fossil energy, fuel cells are now playing an increasingly important role in production and life. However, the battery electrode materials synthesized by traditional methods often have defects such as Pt particle agglomeration and shedding in use which can result in unsatisfactory performance of electrode materials and reduced electrical energy transfer efficiency and electrocatalytic efficiency, thereby leading to lower fuel cell efficiency. In this research, a new method is proposed for synthetizing the most important component of fuel cells—electrode materials, that is, the precursors of C and Pt are simultaneously added to the CMK-3-Pt produced with in-situ grow and one-step synthesis in the SBA-15 template. The elements and micro-areas were characterized by XRD, SEM, TEM and other test methods, and the CHI700E electrochemical workstation was used to test the electrocatalytic activity and electrocatalytic stability. The experimental results show that the Pt particles of electrode materials synthesized by the new method have the characteristics of smaller particle size (4∼6 nm), better dispersion, and less falling off. Besides, these materials have a larger pore volume (0.66 cm3/g), a higher active surface area (803 m2/g, ECSA: 452 cm2/mg), and more excellent electrocatalytic performance (the ratio of peak forward and reverse current: CH3OH catalyst is 1.95, and CH3CH2OH catalyst is 1.38) and better electrocatalytic stability (82.6%). To sum up, electrode materials synthesized once by the in-situ growth method can achieve better performance of the mesoporous electrode materials than those with the traditional synthesis method.
Research on Quality Risk Assessment of EPC Projects for Transmission and Distribution Engineering Based on Design Enterprises
Authors: Zhao Zhong Ze , Meng Qichen , Pang Nansheng 
Published: November 2020

Abstract
Among EPC general contractors, design companies often dominate by virtue of their design advantages. However, due to the complex risks of power transmission and transformation projects throughout their life cycle, quality management is the weak point of the EPC general contractor with design as the leader, and the problems caused by quality risks are directly related to the contractor’s Economic interests and credibility. Therefore, this paper will analyze the potential quality risks in the whole process of the project, establish a risk identification list, and use the fuzzy comprehensive evaluation method to evaluate the quality risk of the EPC project of the power transmission and transformation project led by the design enterprise based on the principle of maximum membership degree.
Image Dehazing Algorithm Based On Improved Guided Filtering
Authors: Lin Jin Chen , Yang Junjie , Yu Ting , Geng Chuanping 
Published: November 2020

Abstract
Aiming at the problem that the image defogging algorithm based on the dark channel prior will cause the edge halo effect in the restored image, an image defogging algorithm based on improved guided filtering is proposed. First, the calculation method of atmospheric light value based on the quadtree algorithm is adopted to obtain a more accurate atmospheric light value; then, the edge weight factor based on the Canny operator is added to the guided filtering algorithm to solve the local halo effect; finally, the image is restored based on the atmospheric physical model. Experiments show that this algorithm is better than other algorithms in subjective visual effects, and the image edge defogging is more natural; the comparison of objective performance indicators shows that the improved defogging algorithm has higher image quality and better image restoration.
Similarity Analysis-Based Diagnosis Method for Open-Circuit Faults of Inverters in PMSM Drive Systems
Authors: Chen Tao , Pan Yuedou 
Published: November 2020

Abstract
A fast, real-time and similarity analysis-based diagnosis method for open-circuit faults in three-phase voltage-source inverters is proposed. The proposed method is based on the mixed logical dynamic (MLD) model of the PMSM drive system to simulate three-phase currents under different faulty conditions, and the Pearson correlation coefficients (PCCs) are used to measure the similarity between the simulated fault types and the actual one, then the fault detection and isolation can be achieved according to the characteristics of PCCs under different faulty conditions. The proposed method only needs to use the current sensors existing in the closed-loop system to measure the currents for fault diagnosis, and can detect the fault within one current fundamental wave period. Simulation results verify the effectiveness of the proposed method.