bluuebunny/crossref_metadata_2025_split huggingface dataset:
Grain Size Distribution Law of Cold-rolled Low-carbon Steel with Various Holding Temperatures
Authors: Wu Lei 
Published: November 2020

Abstract
With the cold-rolled low-carbon steel sheet produced by CSP process as the object of study, uniformity of microstructure and grain size distribution law of “pancake” (elongated) grains were investigated. The samples were annealed under laboratory condition to simulate batch annealing processes with holding temperatures from 660 °C to 700 °C. Conclusions are drawn that the grain size distribution of annealed test steel along both the rolling direction and the thickness direction of the sheet samples accords well with the law described by the Log-normal function.
Effects of Alloying Additions on the Glass Forming Ability and Corrosion Resistance of Bulk Zr-Based Amorphous Alloys
Authors: Shuang Yang 
Published: November 2020

Abstract
By using the real-place Recursion method,the effects of alloying additions (Nb, Ta, Y, La) on glass forming ability(GFA) and corrosion resistance of bulk Zr-based amorphous alloys are studied. An atomic group model in the Zr2Ni primary crystalline phase centered to Ni atom are constructed by computer programming. We have calculated the total bond order integral (£BOI) between Ni atom and its neighbor elements (Nb, Ta, Y, La), also calculated the Fermi energy level of alloying elements. The calculation results show that the XBOI and the glass forming ability are greatly enhanced after Y substitution. Nb, Ta, La decrease the GFA and La has little influence on the GFA of the alloys.Nb, Y, La enable Zr-based amorphous easy to passive and increase corrosion resistance. Therefore, Y and La are most effective on glass forming ability and corrosion resistance of Zr-based amorphous alloys. By addition of minor Y and La can produce the new bulk amorphous alloys with good corrosion resistance.
Design and experimental study of a new type of 45° overflow falling film distributor
Authors: Ciji Gong , Xuesheng Wang , Qinzhu Chen 
Published: November 2020

Abstract
A petrochemical acrylic fiber factory introduced a set of acrylic fiber device in the 1980s. Among them, the evaporation device used for solvent recovery of acrylic fiber appeared to be difficult to heat exchange in the tube. In order to solve the problem, we designed a new 45° overflow falling film distributor device and an experimental system for single tube. The effects of flow rate, liquid level and orifice flow coefficient were investigated experimentally. The results show that the correlation between the orifice flow coefficient and the structure size of the fabric determines the film formation effect. When the flow rate of the single tube is constant, the absolute error of the orifice flow coefficient does not exceed 9%. Therefore, the orifice flow coefficient proposed in this experiment is a good guide to the optimal design of the fabric size.
Research Progress of Biochar Materials for Remediation of Heavy Metal Contaminated Soil
Authors: Wang Han , Tang Yuheng 
Published: November 2020

Abstract
In recent years, with the acceleration of urbanization and the high-speed development of industry, heavy metal pollution of soil has become increasingly serious, posing a huge threat to economic development and human health. The use of biochar to control soil pollution has become a research hotspot. Biochar has unique physical and chemical properties. It can lessen the transfer and transformation of heavy metals when being used to adsorb and fix heavy metals, and has great application potential in repairing heavy metal pollution. This article reviews the factors affecting biochar remediation of soil heavy metal pollution, the preparation and application of functional biochar, and the adsorption mechanism and remediation effect of biochar on heavy metals. Finally, the article summarizes the current problems of biochar repair technology and makes prospects for future development, hoping to provide reference for future research by science and technology workers.
Structural Analysis for Tensile Behavior of Silicon-Carbon Core-Shell Nanotube
Authors: Li Min , Tian Zean , Xie Quan , Dong Kejun 
Published: November 2020

AbstractThis paper presents a molecular dynamics study on the tensile behavior of carbon nanotubes (CNT) with or without nanowire of Si (SiNW) encapsulated. Compared to the CNT without SiNW, the CNT with the SiNW (denoted as SiNW@CNT) shows a decreased tensile strength but an increased maximum tensile deformation rate. The micromechanisms of the different tensile behaviors were explored through the structural analysis including the radial distribution function, the bond angle distribution function, and the statistics of the polygon defects. The results showed that the C-C bond in the CNT under the maximum tensile deformation becomes longer and more uniform due to the van der Waals force between the SiNW and the CNT, which accounts for the change in the macroscopical tensile behavior. Moreover, it has been found that after tensile fracture, the CNT mainly form long chains consisting of triangle, pentagon, and heptagonal defects, while SiNW@CNT cannot form long chains due to the lack of triangular defects. These differences in the microstructures are probably because the C-C bonds in the SiNW@CNT can be strengthened by the SiNW. The results provide a better understanding of the fracture of the CNT and its nano composites, and have certain reference value for the application of the SiNW@CNT.
A Design of combined pipe cleaning and spraying robot based on new cutting tool material
Authors: Yangli  , Wei Tianlu , Chen Xingqiang , Li Dasheng 
Published: November 2020

Abstract
The combined pipeline cleaning and spraying robot based on new cutting tool material includes four components, namely milling mechanism, walking mechanism, spraying mechanism and external coating supply device. The robot’s milling cutter is a special coating cutter. The coating material of the cutter can be used to meet the peeling strength of the pipe surface after spraying. From the view of environmental protection, the robot can reduce the impact of passive process on the environment. According to the actual situation the combination robot can be combined freely, which has a strong practicability.
The partial isothermal section of the Mg-Er-Si Ternary System at 500°C
Authors: Ma Chunhua , Zhang Dingfei , Pan Fusheng , Lu Zhiwen , Zhao Yazhong 
Published: November 2020

Abstract
The partial isothermal section of the Mg-Er-Si ternary system in the Mg-Corner at 500°C has been studied through the equilibrated alloy method by using X-ray diffraction analyses and scanning electron microscopy assisted with energy dispersive spectroscopy of X-ray (SEM-EDS). There is convincing evidence for three compounds which have been clarified to be existing in equilibrium with the a-Mg solid solution at 500°C, i.e. Mg2Si, Er2MgSi2 and Er5Mg24. The results show that the partial isothermal section in the Mg-Corner consists of four single phase regions, five two-phase regions: α-Mg+Er5Mg24, α-Mg+Mg2Si, Mg2Si+Er2MgSi2, α-Mg+Er2MgSi2 and Er5Mg24+Er2MgSi2 and two three-phase regions: α-Mg+Er5Mg24+Er2MgSi2 and α-Mg+Mg2Si+Er2MgSi2. The homogeneity ranges of Mg solid solution as well as the solid solubilities of the intermediate phases at 500°C are reported. The phase of Er5Mg24 (cI58-Mn-type), Mg2Si (cF12-CaF2-type) and Er2MgSi2 have been mainly studied.
Multi-color modulation of phase-changing optical coatings
Authors: Chen Qing Yuan , Liu Fu Rong , Huang Yin , Li Yu 
Published: November 2020

Abstract
Now, various display screens transmit massive information to people all the time and become an important window of human-computer interaction. Solid state optical coating utilizes optical interference effect and inherent optical properties of materials to achieve multiple colors. In this paper, between Fabry-Perot (F-P) cavity coating with dielectric layer and strong interference effect (SIE) coating without dielectric layer were compared. Effect of film thickness on F-P cavity optical phase change coating was studied. The results show that the F-P cavity coating with a dielectric layer has more reflective states than the coating without a strong interference effect, that is, potential for optical coating display. In addition, in the F-P cavity coating, by controlling the thickness of SiO2 and Ge2Sb2Te5 (GST) film, the optical coating shows rich color due to the change of F-P optical cavity length and strong interference effect of materials. We also carried out a study of the flexible substrate compatibility and substrate color of the two structures, and found that they are well compatible with flexible materials, and F-P is more sensitive to substrate color than SIE structures in terms of substrate color. Due to the far subwavelength layer thickness, most phase shift is accumulated on reflection at the interfaces, which makes the reflectance profile robust under tilted incidence.
Investigation of the evolution of free carriers during femtosecond laser-induced ultrafast amorphization in nitrogen doped Ge2Sb2Te5 films
Authors: Wang Y.H. , Liu F.R. 
Published: November 2020

Abstract
The femtosecond laser-driven ultrafast evolution of free carriers during the phase-change process of N-doped Ge2Sb2Te5 (N-GST) film was studied in this paper. And mechanism of initial absorption peak was calculated by two-temperature model. We found that the formation of Ge-N weaken the initial optical absorbance and decreased the concentration of free carriers, then improved the temperature of crystallization in N-GST. The doping(N) can reduce the grain size because of the easing of optical energy absorbance. At last, we inferred that, if the incident laser fluence is enough for phase transformation point, the transformation velocity of N-doped GST is faster than GST.
Hamiltonian System and Viscoelastic Boundary Conditions
Authors: Zhang WX , Zhang XC 
Published: November 2020

Abstract
By using Laplace integral transformation, the viscoelastic stress-strain relationship in the time domain is described as an algebraic equation in Laplace space, which makes the Hamiltonian system method smoothly implemented. Thus, the basic control equations with displacement and stress as basic variables are established, and the viscoelastic problem is transformed into the eigenvalue and eigensolutions. The eigensolutions include a series of independent functions, in which the zero eigenvalue eigensolutions cover all the basic deformations such as tension and bending, and do not decay with the space coordinates.
Electronic and transport properties of armchair graphene nanoribbons with defects
Authors: Zhang Yu , Xu Wenjing , Liu Guangjie , Zhu Jinlong 
Published: November 2020

Abstract
Density-functional theory (DFT) in combination with the nonequilibrium Green’s function formalism is performed to study the electronic and transport properties of armchair graphene nanoribbons with defects. The results show that the electronic and transport properties vary with different type of defects. The binding energy indicate that single-defect AGNRs are the most stable structure and line-defect AGNRs are the most unstable structure. The transmission spectra show that the defective AGNRs become disorder and the value decreases. The energy gap at the Fermi level become wider. These results would guide the experiments in real applications.
Performance Analysis of Absolute Acceleration Shock Response Spectrum
Authors: Sun Wenjuan , Su Qiaoping , Yuan Hongli , Chen Song 
Published: November 2020

Abstract
The Absolute Acceleration Shock Response Spectrum (AASRS), which is most commonly used in engineering is analyzed in detail, and the effects of shock duration, shock amplitude and shock waveform on AASRS are discussed respectively. Shock duration has the greatest influence on the shape and change trend of AASRS, followed by shock amplitude. However, shock amplitude only affects the amplitude of AASRS and does not change the overall change trend. Shock waveform has the smallest influence on AASRS and mainly affects the frequency point of peak acceleration.
Failure Analysis on Galvanized Steel-tube Pole Used for Supporting Electrical Equipment in 500 kV Substation
Authors: Chen Hao , Tian Feng , Zhao Xiaochun , Gong Weiwei 
Published: November 2020

Abstract
Electrical equipment in substation plays a key role in power transmission and distribution, which is usually supported by the steel-tube pole. In recent years, more and more crack defects were found in steel-tube pole used for supporting electrical equipment in substations, thus the safety and stability of power grids is severely affected. In this paper, the cracked steel-tube support of electrical equipment in a 500kV substation was investigated by means of macro-morphology inspection, chemical composition analysis, mechanical properties test, microstructure analysis, water sample analysis and fireworks experiment. The result showed that there was a grouting hole with poor sealing in the top of the steel-tube pole, so the rainwater and snowmelt could flow into the tube through the gaps. Once the temperature dropped abruptly, the water inside the tube would freeze and expand, led to the bursting of the steel-tube pole. Finally, effective suggestions were put forward, which could ensure the electrical equipment operating safely and stably.
A Safety Risk Evaluation Index System of Subway Projects Based on the Analytic Hierarchy Process
Authors: Wu Han , Qian Zhixin , Wang Junwu 
Published: November 2020

Abstract
The construction process of the subway project, which is a hidden underground project, is facing many unknown factors, and construction technology is difficult and the quality requirement is high. In order to ensure the safety of subway construction personnel, property and smooth completion of the project, this paper selects and constructs the influencing factors of subway project construction safety risk evaluation according to the 4E1M method, calculates the weight of each index by the analytic hierarchy process, selects 60% of the indexes before the weight ranking, and establishes an index system including 5 criteria indexes and 16 secondary indexes.This electronic document is a “live” template. The various components of your paper [title, text, heads, etc.] are already defined on the style sheet, as illustrated by the portions given in this document.
Dynamics Performance Analysis of a 400 km/h EMU
Authors: Liu Jun , Wang Qi , Yu Yunhai 
Published: November 2020

Abstract
In order to study the dynamics performance of a 400 km/h high-speed train, a nonlinear dynamics model of a 400 km/h EMU (Electric Multiple Units) composed of three vehicles is built. The dynamics performance of those vehicles under new and worn wheel/rail interactions are examined and compared through numerical analysis. It shows that the lateral acceleration on the middle vehicle is 23% smaller than that of the head vehicle and the tail vehicle under a new tread condition; in case of wheel wear, the lateral acceleration on the middle vehicle is 31% smaller than that of the head vehicle and the tail vehicle; the vertical wheel/rail force of the middle vehicle is 10.5% larger than that of the head vehicle and the tail vehicle; the lateral wheelset force under the worn wheel case is 52% greater than that under the new wheel condition. In all numerical cases, the vehicle dynamics indexes all meet the required limits which proves that the 400 km/h high-speed train is properly designed.
Finite element error analysis on transmission shaft parts and application of local mesh refinement
Authors: Xiaoying Wang , Xiaowei An 
Published: November 2020

Abstract
In view of the strength problem of the transmission shaft parts in the swinging and punching structure of the forging press, based on the finite element analysis theory and the mesh refinement method, the accuracy of the finite element calculation in the whole mesh refinement process is analyzed by comparing the element strain energy error and the energy percentage error of different node numbers. The results show that the edge length of the discretized element is reduced and the calculation accuracy is improved correspondingly, but the calculation amount of the whole mesh refinement is large.Therefore, local mesh refinement is applied to improve the calculation accuracy. The results show that the error of energy percentage tends to be 10%, and the calculation accuracy is high. The accuracy analysis method and the application of local grid refinement provide the theoretical basis for the structural optimization of mechanical products.
Crystallization kinetics of diopside glass ceramics
Authors: Si Wei , Li Shan 
Published: November 2020

Abstract
The glass ceramics were prepared by a reaction crystallization and sintering method using waste glass powder and a crystallizing promoter with a main crystal phase of the enstatite. X-ray diffraction(XRD), Scanning electron microscope(SEM), Differential scanning calorimetry(DSC), etc. were used to characterize its phase composition, morphology, and thermal decomposition process. The results show that the main crystal phase of the prepared glass ceramics was diopside and the secondary crystal phase was albite. The precipitated crystals were rod-shaped with a maximum length of about 7 μm and a diameter of about 0.6 μm. Diopside glass ceramics were measured with different heating rates, and it was found that the peak temperature increased with the heating rate. The Kissinger method was used to calculate the crystallization kinetics of diopside glass ceramics, and the crystallization activation energy was 872.4 kJ⋅mol−1.
Nonlinear dynamics of the marine rotor-bearing system during the pitching motion
Authors: Zhang Wenzhuo , Li Ming , Liu Gang 
Published: November 2020

Abstract
In order to study the motion law of the rotor-bearing system under ship pitching motion, the dynamic model of the marine rotor-bearing system is established. The dynamic characteristics of the system with different speeds are analysed by numerical method, such as Poincaré map, the frequency spectrum, and the largest Lyapunov exponents. The results show that with the increase of the rotational speed, there are abundant dynamic phenomena, such as single period, quasi-period and quasi-period of the upper and lower branches. Moreover, due to influence of the pitching motion of ship, the rotor tilts in the bearings and its procession occurs obviously, which affects the stability of the operation of rotor-bearing system. The findings of this study will contribute a comprehension of the nonlinear dynamic behaviours of the rotor-bearing system subjected to ship pitching motion.
Study on nonlinear dynamics of the marine rotor-bearing system under yawing motion
Authors: Shi Yangxu , Li Ming , Li Ming 
Published: November 2020

Abstract
After considering the yawing motion, the dynamic model of the marine rotor-bearing system is developed on the short bearing theory. Theoretical analysis shows that the yawing motion causes gyroscopic moment and strong nonlinear time-varying transport inertia moment. The dynamic characteristics of the rotor-bearing system with and without yawing motion are compared. The result shows that the yawing motion significantly affects the dynamic characteristics of the rotor-bearing system, which makes the rotor system be dominated by the quasi-period. The yawing motion makes the rotor amplitude increase significantly at low speed. Finally, under the influence of yawing motion, the dynamic characteristic of the rotor shows chaos at high speed.
Mechanical equipment based on hall three-dimensional structure study on the application of security forces
Authors: Lijuan -Ji  , Lu-Gao  , Hao-Wu  , Peng-Yan  
Published: November 2020

Abstract
For informatization under the condition of complex mechanical equipment support difficult problems in our country, absorb method of hall three dimensions structure theory, this paper constructs the mechanical equipment support strength using the architecture, methods on the use of the security forces, security requirements, security tasks, security model, implementation steps and method innovation, scheme evaluation system comprehensive study.
Process Analysis and Experimental Research of 3D Printing with Variable Parameters
Authors: Lianghua Zeng 
Published: November 2020

Abstract
In view of the current situation that 3D printing uses fixed parameters, the reasons for the need to carry out 3D printing with variable-parameters are proposed based on theoretical analysis. The paper conducts a theoretical analysis of the adaptive layering algorithm and calculates the error expressions of different contours. The effects of variable printing speed and variable layer thickness on printing accuracy are analyzed based on experiment, which provides a basis for dynamic control and optimization of printing parameters. Finally, the necessity of printing with variable parameters is demonstrated.
Band Gap Engineering of Twisted Bilayer MoS2 Sheets
Authors: Zhang Yu , Xu Wenjing , Liu Guangjie , Zhu Jinlong 
Published: November 2020

Abstract
Density functional theory (DFT) calculations were performed to predict the modulation of band gap by twisting bilayer MoS2 sheets with different rotation angles. The electronic band structure results show that the rotations can make bilayer MoS2 sheets change from semiconducting to metallic. The band gap decreases from 1.24eV to 0.06eV. These results would open up possibilities for its applications in nanoelectronic devices simply by tuning band gaps of MoS2 with rotation angles.
Dynamic response of RC beams subjected to short-range lateral blast load
Authors: Xi Kuantang , Huang Shuai , Zhang Yi , Li Xiangyang 
Published: November 2020

Abstract
In this paper, the finite element software ABAQUS is used to simulate the RC beams under the short distance lateral blast load, consider the constraint effect of the plate, and analyze the influence of proportional distance, strength of concrete, strength of reinforcement, ratio of longitudinal reinforcement and other influencing factors on the dynamic response of RC beam. The results show that the CONWEP loading blast is reliable. The proportional distance is less than 0.200, and the lateral blast load has a great influence on the maximum lateral displacement of reinforced concrete beam with plate constraint. The influence of the strength grade of concrete and steel on the dynamic response of RC beams with slab constraints is limited. There is a negative correlation between the ratio of longitudinal reinforcement and the lateral displacement of RC beams with slab constraints. When longitudinal reinforcement ratio is more than 2.11%, RC beams with slab constraint can well resist lateral explosion load, but the lifting amplitude is not obvious.
Numerical study on thermal runaway of lithium-ion batteries with liquid cooling
Authors: Yang Na , Tong Yixin , Zhao Lijun , Li Hongliang , Xie Hui 
Published: November 2020

Abstract
A number of fires broken out in electric vehicle in recent years have raised concerns about the thermal safety of batteries. Some cases of abuse, such as overcharge and overdischarge, nail penetration, and high temperature, can make the battery temperature exceed the control. Therefore, it is of great significance to study the occurrence and propagation mechanism of thermal runaway in batteries to improve the safety of batteries. In this paper, a micro-channel cooling system is established to study its cooling effect on the battery module. The electrochemical - thermal coupling model of the battery is established to analyze the heat production and temperature changes during the battery’ nail penetration process. Then a model of runaway propagation is established to analyze the heat transfer between batteries. The numerical simulation method is used to study the effect of the cooling system. The results show that the designed cooling scheme can prevent thermal runaway propagation between batteries.