bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation Analysis of Cavity Shape of Compound Pendulum Jaw Crusher
Authors: Zhong Xiaoqin , Niu Xiaojian , Ji Qiqiang , Shen Xiuguo 
Published: October 2020

Abstract
Taking the working device of PE1500 × 1800compound pendulum jaw crusher as the research object, 3D model of working devices of four different cavity shape compound pendulum jaw crushers is carried out by using SolidWorks, and then the kinematic simulation software ADAMS is imported to carry out the kinematic simulation, and the horizontal and vertical displacement change curves of four characteristic points of the lower part of the crushing cavity are obtained. According to the simulation results, the relative production capacity and the block-up coefficient of each broken layer of the jaw crusher are calculated under the same spindle speed and different cavity shape. The results show that the block-up coefficient of the crusher with curved crushing chamber is smaller and its relative production capacity is larger.
Progress and Key Technical Control Points of Side Slip-form Construction Technology
Authors: Liu Ying , Wang Xinpeng 
Published: October 2020

Abstract
Slip-form pavement of road surface construction is an efficient mechanical construction method, compared to the traditional construction method of erection of template for cast in situs or backcourt prefabrication while hoisting in the front court, slip-form construction technology dispenses with the prefabrication site and a lot of prefabrication dies, meanwhile, it reduces the process of handling and lifting, and can improve the flatness of the structure to obtain beautiful line type and unified color. Moreover, it can achieve “low-carbon” construction by reducing the energy consumption. In this paper, introduction was given for key technology of the construction technology and the current foreign development situation, to provide a reference for engineering technicians.
Research on Application of Wheels with External Track Technology under Soft Road Condition
Authors: Hou Youshan , Wang Chao , Cai Wenbin 
Published: October 2020

Abstract
Wheeled vehicles usually adopt external track when passing through soft road conditions. Taking the large wheelbase four-wheel vehicle as the example, based on recurdyn, the dynamic simulation analysis of two driving modes of wheeled vehicles and wheel with external track was completed, focusing on the comparative analysis of ground specific pressure, hook traction, wheel sinkage and other aspects. The results show that the vehicle passability under the soft condition is improved after the wheels are attached to the track, the vehicle’s theoretical grounding is 86.7% less than the reduction, and the hook traction is nearly 10 times higher. However, for the large wheelbase structure, the track between the two wheels needs to improve the passability by adding load-bearing wheels.
Finite Element Analysis of Short-edge Distance of Fastener Holes in Composite Laminates
Authors: Zhao Luchun , Zhao Zhiqin 
Published: October 2020

Abstract
In the production process of aircraft structures, due to design defects or the accumulation of tolerances in part manufacturing and assembly, structural short margins appear at the mechanical joints of composite laminates. In this paper, the analytical method is used to analyze the hole edge stress of the composite material fastener, and the finite element analysis of the short edge distance of the fastener hole of the composite laminate structure is carried out. The hole edge stress and residual net of the structure after the short edge distance. The stress distribution of the cross-section is analyzed to discuss the changes of the stress and strain at the edge of the hole after the short margin of the composite laminate to determine the effect on the strength of the aircraft.
Research on the Fretting Slip Characteristics of Interference Fit Surface of Train’s Wheelset Running in Heavy Loads
Authors: Song Jianfeng , Song Younian , Wang Wenwu , Dong Yonggang 
Published: October 2020

Abstract
Running under the condition of heavy loads and accelerating status, the fretting damage of wheelset interference fit surface brings great hidden danger to the running safety of the train. Based on heavy loads train equipment parameters and running conditions by using the finite element software ABAQUS finite element model is established and simulated by different axle load and wheel inner hole under the conditions of different amount of interference with the axle wheel seat interference fitted surface fretting slip three-dimensional distribution, and the interference fit different axial location wheel revolving process of three feature points in axial and tangential fretting slip. The results show that the axial fretting slip of the edge of the interference fit surface is much larger than that of the middle, and the outer side is larger than the inner side, with a maximum value 22 µm; tangential fretting slip of interference fit surface reaches the maximum value 9.8µm, when the node rotates by about 270°. The influence of the value of shrink fit on fretting slip is more obvious than that of loads on the axle of the wheelset.
Research on the Dynamic Characteristics of Magnetic Bearing-rotor System with Auxiliary Bearing
Authors: Ma Lin , Wang Shijun , Wang Peng 
Published: October 2020

Abstract
Non-linear factors such as magnetic force and rub-impact force are comprehensively considered on the basis of the classic Jeffcott rotor system model, and the dynamic model of the magnetic bearing-rotor system is established. The dimensionless motion equation is obtained by introducing dimensionless parameters. The pattern types and distribution regions of adjacent fundamental periodic motions of the system are obtained based on multi-objective and multi-parameter co-simulation analysis, and the dynamic behaviour is analysed through three-dimensional bifurcation diagram, two-parameter bifurcation diagram, single-parameter bifurcation diagram and axis locus diagram. The reasonable matching range of parameters of system and speed ratio is obtained in this paper, which optimizes the structural parameter design of the rotor system and determines its reasonable and stable working interval.
Advances in Automatic Hexahedral Meshing
Authors: Li Chentao , Qiang Sheng , Hua Xia 
Published: October 2020

Abstract
The problem of Automated hexahedral meshing has been a puzzle of mesh generation research for years. A great deal of effort has been made on how to generate high-quality hexahedral mesh automatically. The conflicts between different requirements of the mesh provide the challenge. The paper systematically reviews the requirements of the hexahedral meshing challenge, sums up the various approaches to solve the problem and their respective characteristics, analyzes the breakthroughs in recent research, especially in multi-subdomain and strebel differential method. It finally points out that the development of geometric aspects and optimal transmission theory will be the main topics for the research on the organizational creativity in the future.
The Predictive Model of Decarburization Depth of Heavy Rail Billet Surface
Authors: Jiang Fanzhi , Kong Jianyi , Ouyang Degang 
Published: October 2020

Abstract
In order to determine the influence of heating technology on the decarburization depth of heavy rail billets, the surface decarburization of U75V and U71Mn heavy rail billets under different heating processes was experimentally studied. According to the experimental results, the predictive model of decarburization depth on the surface of heavy rail billet was established, and the errors between the results of the predictive model and those actually measured were less than 5%.
Structure Design and Performance Test of CO2 Scroll Compressor for Heat Pump
Authors: Zhou Dao , Zhao Panpan , Jia Lei , Yuan Xudong 
Published: October 2020

Abstract
Scroll profile design and shell strength design are important in the development of CO2 scroll compressors for heat pumps. In order to meet the multi-operating conditions of the heat pump, the non-clearance profile correction method and the clearance profile correction method are analysed, and the clearance profile correction method was adopted to complete the profile design. The safety factor design method was compared with the reliability design method, and the shell of the CO2 scroll compressor for heat pump was designed based on the reliability design method. The test results show that the scroll tooth with clearance correction method meets the design requirements of heating capacity of 4.8kW±10%, the energy efficiency ratio is not less than 4.6, and the shell structure with 99.38% reliability can meet the structural safety requirements.
Effects of Wall Wettability on the Interaction between Vapor Bubbles in Pool Boiling
Authors: Guan Geng , Shan Xiaopeng , Nie Deming 
Published: October 2020

Abstract
The interaction between vapor bubbles resulting from phase change in pool boiling was simulated through a two-phase lattice Boltzmann method. Two heated plates with constant heat flux were used to serve as the nucleate sites. The effects of wall wettability were examined. In doing so, three types of surface were taken into account, i.e. the hydrophilic surface, neutral surface and hydrophobic surface. It has been shown that the effects of wettability on the interaction between bubbles are significant in terms of the bubble mergence as well as the rate of heat transfer. In addition, the influence of the separation between the heated plates was also checked.
Numerical Simulation on Deposition of Atomization Droplet of Air-assist Boom Spraying in Air Flow
Authors: Zhong Wei , Zhou Huitao , Jia Weidong , Xue Fei 
Published: October 2020

Abstract
Air-assist Boom Spraying is a crucial technique and spray method of plant protection which has a significant effect on improving the efficiency of pesticide application and reducing droplet drift. Spraying drift is the main reason for the low utilization rate of pesticides, at the same time, the interaction of natural wind and the air bag wind is the main cause of spray drift. But at present, the regularity of spray droplet deposition and motion trajectory under the common influence of natural wind and air bag wind is not yet clear. The kinematics characteristics of the droplets deposition of air-assist boom spraying in the plants is investigated with numerical simulation method. The Phase Doppler Particle Analyzer (PDPA) is used to validate the numerical simulation results and it indicates that the deposition process can be well reproduced. The results show that the bigger droplets (>150 μm) get more kinetic energy from the vertical airflow and locate in windward side. These droplets are not sensitive to the horizontal airflow and are easier to deposit within a short time. The droplets with smaller size (<150 μm) are minimally influenced by the vertical airflow and suspend in the upside of the flow field. The vertical airflow not only prevents the horizontal airflow drift the droplets, but also introduces a vortex region near the canopy of the plants, which rotates the plant canopy and increases the droplet deposition on backside of the leaves. This study improves the understanding of the droplets deposition under the multi-wind fields and provides the theoretical basis for the innovation of the air-assist boom spraying system.
Modeling and Simulation of the Water Hydraulic Cylinder System Based on AMESim
Authors: Deng Xiangzhou , Sun Kailuan , Zhang Haiying , Zhang Yan , Li Tengfei 
Published: October 2020

Abstract
Pure water hydraulic is a green and pollution-free hydraulic technology, but the leakage in the cylinder makes its working efficiency greatly reduced. In this paper, a mathematical model of the water hydraulic cylinder has been established to analyze the factors of cylinder leakage. And a locking loop model with leakage module is established by AMESim software. Through simulation analysis, it is considered that the wall clearance of the water hydraulic cylinder is an important parameter affecting the leakage in the cylinder.
The 2nd International Scientific and Practical Conference on Mathematical Modeling, Programming and Applied Mathematics (Yaroslav-the-Wise Novgorod State University, Russia)
Authors: Eminov S I 
Published: October 2020

At the Yaroslav-the-Wise Novgorod State University (Russia, Veliky Novgorod, ul. Bolshaya Sankt-Peterburgskaya, 41) on November 5-6, 2020, the International Scientific and Practical Conference “Mathematical Modeling, Programming and Applied Mathematics” will be held for the second time. Major scientists from Moscow and St. Petersburg, Kazan and Voronezh and Tver, and other cities of Russian Federation and from Belarus, Bulgaria, Kazakhstan, Ukraine, China, USA, Egypt, submitted their applications and articles. Despite the difficult situation associated with the spread of COVID-19, the interest in the conference is quite considerable.
The scientists – participants of the conference – present their latest scientific achievements, exchange experience and discuss issues of mathematical modeling in applied mathematics, programming, physics. Also, the conference participants will analyze and evaluate innovative solutions in terms of their relevance, effectiveness and prospects for further development.
The conference will include plenary sessions and 8 scientific sections. An auditorium equipped with the necessary computer equipment for online broadcasting is provided for each section.
List of International Program Committee, Organizing Committee, Editorial Committee, Invited Speakers and Organizing Institution are available in this pdf.
Information-analytical semantic model of an expert system for studying the co-evolution of the sociotechnical landscape in digital reality
Authors: Artemenko M V , Budanov V G , Korenevskiy N A 
Published: October 2020

Abstract
Currently, the development of society is largely determined by the expansion of digital technology into various social practices. Prediction and management of the co-evolution of society in digital reality is determined by the need to ensure sustainable development of society and adequate satisfaction of practices with information technology. The aim of the study was the development and pilot study of the capabilities of the information-analytical semantic model of an expert system for the analysis and management of socio-technical landscapes (STL) in digital reality. The network semantic structure of the knowledge base with unified decision modules in network nodes is substantiated. An enlarged diagram of the model is given and its functioning is described. Examples of the pilot application of the crucial modules of the expert system are examined: social practice “medicine” and digital technologies: “Artificial Intelligence”, “Information Technology”, “Mobile Technologies”, “Internet of Things”, “Big Data”. There are sharp changes in the ratios of feasibility and demand for technologies that occurred in the first half of 2020 compared to 2019 (which is associated with the consequences of the COVIN-19 pandemic). It is shown that the STL reaction is modeled by a transient process characteristic of the vibrational link.
A measure of basis efficiency at solving the Schrödinger torsion equation. Reaching the variational limit
Authors: Belov A N , Turovtsev V V , Fedina Yu A , Orlov Yu D 
Published: October 2020

Abstract
The procedure of the numerical solution of the Schrödinger torsion equation in matrix form in the planar wave basis set was considered. The concept of the largest level number that has reached the variation limit for a given number of basis functions was introduced as a quantitative measure of the basis efficiency. The rate of convergence to reliable values of levels and transitions has been studied. The problem of the maximum possible energy level number computed with the required accuracy for a given basis size has been solved. It was demonstrated that the number of levels that have reached the variational limit has linear relationship with the number of basis functions, and the angular slope coefficients of such dependencies are quite close to each other and equal to roughly 0.96. This allows prediction of the accuracy of the calculation method and conscious choice of the basis power.
Thermally expanded graphite from graphite nitrate cointercalated with ethyl formate and acetic acid: morphology and physicochemical properties
Authors: Berestneva Yu V , Raksha E V , Voitash A A , Arzumanyan G M , Savoskin M V 
Published: October 2020

Abstract
Triple graphite nitrate cointercalation compound with ethyl formate and acetic acid was synthesized and used as a source of the thermally expanded graphite. The effect of the drying regime of the cointercalation compound on its surface morphology as well as ability to the thermal expansion was investigated. Complex studies of the microstructure, morphology, and quality of the obtained thermally expanded graphite by XRD, TEM, and Raman spectroscopy showed that as compared to the initial graphite TEG is less ordered, has a multilayer and insufficiently ordered structure without visible surface defects.
Designing reverse converter for data transmission systems from two-level RNS to BNS
Authors: Bergerman M V , Lyakhov P A , Voznesensky A S , Bogaevskiy D V , Kaplun D I 
Published: October 2020

Abstract
In this paper, we present a reverse conversion from a two-stage Residue Number System (RNS) to a Binary Number System (BNS) with a special set of level 1 modules {2
α1, 2
α2 − 1, …, 2αn
− 1} and level 2 modules {2
β1, 2
β2
− 1, …, 2
β
k
− 1}. The proposed method is based on the Chinese Remainder Theorem (CRT) with fractions and using a calculation method that uses constant multiplications to speed up calculations. This article discusses the simulation of FPGA reverse conversion to a two-stage RNS using the proposed method and the standard CRT using adders, their comparison of latency and hardware costs.
The shift operators related to the Fourier cosine and sine transforms and visualization of their action
Authors: Britvina L E 
Published: October 2020

Abstract
We consider the shift operators generalized by the convolutions for the Fourier cosine and sine transforms. Three out of four considered operators are not the generalized shift operator of the Levitan’s type. The basic properties of the shift operators are presented. The GeoGebra applets have been created to visualize the actions of the shift operators.
The decay mechanism of 1,1,2,2-tetranitroxyethane according to theoretical calculations
Authors: Chachkov D V , Egorov D L , Nikolaeva E V , Shamov A G , Khrapkovskii G M 
Published: October 2020

Abstract
The geometric structure was determined and the mechanisms of thermal decomposition were studied using the quantum-chemical method of the density functional B3LYP/6-31+G (2df, p) for 1,1,2,2-tetranitroxyethane and structurally similar 1,2-dinitroxyethane and nitroxyethane molecules: O-N homolytic decomposition, α-elimination of HNO2 and various variants of β-elimination of HNO3. It is established that the radical mechanism is the main channel for the gas-phase decomposition of the studied compounds.
Notes about the linear complexity of cyclotomic binary sequences of order four over a finite field of odd characteristic
Authors: Edemskiy V A , Sokolovskii N S 
Published: October 2020

Abstract
In this paper, we investigate the linear complexity and the minimal polynomial of cyclotomic binary sequences of order four over a finite field of odd characteristic. The sequences considered are determined on the basis of two cyclotomic classes of the fourth order. We show that they have a high linear complexity.
Distributions of silicon implanted in GaN epitaxial layers
Authors: Fedorov D G , Seleznev B I , Zhelannov A V 
Published: October 2020

Abstract
Ion-doped layers of n+ - GaN were formed with a high degree of activation of the embedded impurity. Si+ ion implantation was performed in GaN epitaxial layers grown by MOCVD. Profiles of embedded silicon in gallium nitride were calculated. The experimental profile obtained by secondary ion mass spectrometry is compared with the calculated one. Optimal implantation modes were determined, the implantation dose is 1015 cm−2, and the energy is 50 keV. Activation of the embedded impurity was performed by high-temperature photon annealing in a nitrogen medium using SiO2 and Si3N4 protective coatings. The influence of the annealing temperature on the morphology of protective coatings is considered. The SRIM program was used to simulate the process of ion implantation of silicon at the interface of the AlGaN/GaN heterostructure through SiO2 dielectric films of different thickness. Ohmic contacts were formed on the ion-doped basis of the Ti/Al/Ni/Au metallization system. The calculation of the contact resistance of ohmic contacts showed that the use of ion doping through a 50 nm thick silicon dioxide film reduces the contact resistance from 1.2 Ω·mm to 0.8 Ω·mm. The use of ion implantation technology in the manufacture of diode structures reduces the direct voltage drop and the minimum voltage drop is achieved when using implantation through a 50 nm SiO2 mask, this is due to the location of the maximum distribution of the implanted impurity at a depth corresponding to the occurrence of a two-dimensional electron gas.
Creation of aerosolized detergent compositions for cleaning high-precision metal mirrors
Authors: Filin S , Rogalin V , Kaplunov I , Satayev M 
Published: October 2020

Abstract
We report on a studies on the possibility of extending the service life of products of non-ferrous metals by physical and chemical treatments with specially created azeotropic compositions. These studies were carried out on high-precision copper mirrors for high-power CO2 lasers, exposed during operation to different climatic influences, worsening of their operational characteristics. The results obtained in this paper can be applicable for physical and chemical cleaning of such mirrors and other high-precision parts from non-ferrous metals. The work is devoted to the creation of aerosol detergent compositions intended for use during the operation of mirrors in the field climatic conditions. It is shown that when aluminium and tin-plate aerosol containers are used, compositions that are used to clean metal mirrors should not contain chlorine-substituted hydrocarbons or even “traces” of water and hydroxyl ions. In addition to copper mirrors, optical elements made of other materials were also studied in this work.
Computer modeling of a biharmonic oscillator
Authors: Frolov D A , Safin A R , Udalov N N , Sotskov V A 
Published: October 2020

Abstract
In this work computer modeling of a two-mode Colpitts oscillator operating in the phase locking of two modes was carried out. Modeling of an oscillator operating modes and the experiment allow to draw a conclusion about possibility of phase noise reduction in a stationary synchronous biharmonic mode that can be used in the frequency stabilization task.
Invariant description for batch version of UCB strategy for multi-armed bandit
Authors: Garbar S V 
Published: October 2020

Abstract
We consider a variation of upper confidence bound strategy for multi-armed bandit in batch processing setting. Invariant descriptions with the unit control horizon are obtained for upper bounds in the strategy and for regret. A set of Monte-Carlo simulations are performed for different settings of MABs to determine the minimax regret for multi-armed bandits with different configurations.
The lamb shift
Authors: Granovskii Ya I 
Published: October 2020

Abstract
In this paper I have returned to the coordinate representation of Coulomb propagator and wave function significantly simplified thanks to spiral choice of Dirac matrices (see Appendix). The series in Zα appeared as hypergeometric functions, division to soft and hard photons and their sewing became superfluous etc. The nonrelativistic part of shift is shown completely due to contribution of only one partial wave P
1/2 of propagator.